Merge tag 'hid-for-linus-2024010801' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid

Pull HID updates from Jiri Kosina:

 - assorted functional fixes for hid-steam ported from SteamOS betas
   (Vicki Pfau)

 - fix for custom sensor-hub sensors (hinge angle sensor and LISS
   sensors) not working (Yauhen Kharuzhy)

 - functional fix for handling Confidence in Wacom driver (Jason
   Gerecke)

 - support for Ilitek ili2901 touchscreen (Zhengqiao Xia)

 - power management fix for Wacom userspace battery exporting
   (Tatsunosuke Tobita)

 - rework of wait-for-reset in order to reduce the need for
   I2C_HID_QUIRK_NO_IRQ_AFTER_RESET qurk; the success rate is now 50%
   better, but there are still further improvements to be made (Hans de
   Goede)

 - greatly improved coverage of Tablets in hid-selftests (Benjamin
   Tissoires)

 - support for Nintendo NSO controllers -- SNES, Genesis and N64 (Ryan
   McClelland)

 - support for controlling mcp2200 GPIOs (Johannes Roith)

 - power management improvement for EHL OOB wakeup in intel-ish
   (Kai-Heng Feng)

 - other assorted device-specific fixes and code cleanups

* tag 'hid-for-linus-2024010801' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid: (53 commits)
  HID: amd_sfh: Add a new interface for exporting ALS data
  HID: amd_sfh: Add a new interface for exporting HPD data
  HID: amd_sfh: rename float_to_int() to amd_sfh_float_to_int()
  HID: i2c-hid: elan: Add ili2901 timing
  dt-bindings: HID: i2c-hid: elan: Introduce Ilitek ili2901
  HID: bpf: make bus_type const in struct hid_bpf_ops
  HID: make ishtp_cl_bus_type const
  HID: make hid_bus_type const
  HID: hid-steam: Add gamepad-only mode switched to by holding options
  HID: hid-steam: Better handling of serial number length
  HID: hid-steam: Update list of identifiers from SDL
  HID: hid-steam: Make client_opened a counter
  HID: hid-steam: Clean up locking
  HID: hid-steam: Disable watchdog instead of using a heartbeat
  HID: hid-steam: Avoid overwriting smoothing parameter
  HID: magicmouse: fix kerneldoc for struct magicmouse_sc
  HID: sensor-hub: Enable hid core report processing for all devices
  HID: wacom: Add additional tests of confidence behavior
  HID: wacom: Correct behavior when processing some confidence == false touches
  HID: nintendo: add support for nso controllers
  ...

Documentation/devicetree/bindings/input/elan,ekth6915.yaml

@@ -18,8 +18,9 @@ allOf:
 
 properties:
   compatible:
-    items:
-      - const: elan,ekth6915
+    enum:
+      - elan,ekth6915
+      - ilitek,ili2901
 
   reg:
     const: 0x10

drivers/hid/Kconfig

@@ -761,14 +761,15 @@ config HID_MULTITOUCH
 	  module will be called hid-multitouch.
 
 config HID_NINTENDO
-	tristate "Nintendo Joy-Con and Pro Controller support"
+	tristate "Nintendo Joy-Con, NSO, and Pro Controller support"
 	depends on NEW_LEDS
 	depends on LEDS_CLASS
 	select POWER_SUPPLY
 	help
-	Adds support for the Nintendo Switch Joy-Cons and Pro Controller.
+	Adds support for the Nintendo Switch Joy-Cons, NSO, Pro Controller.
 	All controllers support bluetooth, and the Pro Controller also supports
-	its USB mode.
+	its USB mode. This also includes support for the Nintendo Switch Online
+	Controllers which include the Genesis, SNES, and N64 controllers.
 
 	To compile this driver as a module, choose M here: the
 	module will be called hid-nintendo.
@@ -779,9 +780,9 @@ config NINTENDO_FF
 	select INPUT_FF_MEMLESS
 	help
 	Say Y here if you have a Nintendo Switch controller and want to enable
-	force feedback support for it. This works for both joy-cons and the pro
-	controller. For the pro controller, both rumble motors can be controlled
-	individually.
+	force feedback support for it. This works for both joy-cons, the pro
+	controller, and the NSO N64 controller. For the pro controller, both
+	rumble motors can be controlled individually.
 
 config HID_NTI
 	tristate "NTI keyboard adapters"
@@ -1296,6 +1297,15 @@ config HID_ALPS
 	Say Y here if you have a Alps touchpads over i2c-hid or usbhid
 	and want support for its special functionalities.
 
+config HID_MCP2200
+	tristate "Microchip MCP2200 HID USB-to-GPIO bridge"
+	depends on USB_HID && GPIOLIB
+	help
+	  Provides GPIO functionality over USB-HID through MCP2200 device.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called hid-mcp2200.ko.
+
 config HID_MCP2221
 	tristate "Microchip MCP2221 HID USB-to-I2C/SMbus host support"
 	depends on USB_HID && I2C

drivers/hid/Makefile

@@ -79,6 +79,7 @@ obj-$(CONFIG_HID_LOGITECH_HIDPP)	+= hid-logitech-hidpp.o
 obj-$(CONFIG_HID_MACALLY)	+= hid-macally.o
 obj-$(CONFIG_HID_MAGICMOUSE)	+= hid-magicmouse.o
 obj-$(CONFIG_HID_MALTRON)	+= hid-maltron.o
+obj-$(CONFIG_HID_MCP2200)	+= hid-mcp2200.o
 obj-$(CONFIG_HID_MCP2221)	+= hid-mcp2221.o
 obj-$(CONFIG_HID_MAYFLASH)	+= hid-mf.o
 obj-$(CONFIG_HID_MEGAWORLD_FF)	+= hid-megaworld.o

drivers/hid/amd-sfh-hid/amd_sfh_common.h

@@ -37,6 +37,11 @@ struct amd_mp2_sensor_info {
 	dma_addr_t dma_address;
 };
 
+struct sfh_dev_status {
+	bool is_hpd_present;
+	bool is_als_present;
+};
+
 struct amd_mp2_dev {
 	struct pci_dev *pdev;
 	struct amdtp_cl_data *cl_data;
@@ -47,6 +52,7 @@ struct amd_mp2_dev {
 	struct amd_input_data in_data;
 	/* mp2 active control status */
 	u32 mp2_acs;
+	struct sfh_dev_status dev_en;
 };
 
 struct amd_mp2_ops {

drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_desc.c

@@ -132,7 +132,7 @@ static void get_common_inputs(struct common_input_property *common, int report_i
 	common->event_type = HID_USAGE_SENSOR_EVENT_DATA_UPDATED_ENUM;
 }
 
-static int float_to_int(u32 flt32_val)
+int amd_sfh_float_to_int(u32 flt32_val)
 {
 	int fraction, shift, mantissa, sign, exp, zeropre;
 
@@ -201,9 +201,9 @@ static u8 get_input_rep(u8 current_index, int sensor_idx, int report_id,
 			     OFFSET_SENSOR_DATA_DEFAULT;
 		memcpy_fromio(&accel_data, sensoraddr, sizeof(struct sfh_accel_data));
 		get_common_inputs(&acc_input.common_property, report_id);
-		acc_input.in_accel_x_value = float_to_int(accel_data.acceldata.x) / 100;
-		acc_input.in_accel_y_value = float_to_int(accel_data.acceldata.y) / 100;
-		acc_input.in_accel_z_value = float_to_int(accel_data.acceldata.z) / 100;
+		acc_input.in_accel_x_value = amd_sfh_float_to_int(accel_data.acceldata.x) / 100;
+		acc_input.in_accel_y_value = amd_sfh_float_to_int(accel_data.acceldata.y) / 100;
+		acc_input.in_accel_z_value = amd_sfh_float_to_int(accel_data.acceldata.z) / 100;
 		memcpy(input_report, &acc_input, sizeof(acc_input));
 		report_size = sizeof(acc_input);
 		break;
@@ -212,9 +212,9 @@ static u8 get_input_rep(u8 current_index, int sensor_idx, int report_id,
 			     OFFSET_SENSOR_DATA_DEFAULT;
 		memcpy_fromio(&gyro_data, sensoraddr, sizeof(struct sfh_gyro_data));
 		get_common_inputs(&gyro_input.common_property, report_id);
-		gyro_input.in_angel_x_value = float_to_int(gyro_data.gyrodata.x) / 1000;
-		gyro_input.in_angel_y_value = float_to_int(gyro_data.gyrodata.y) / 1000;
-		gyro_input.in_angel_z_value = float_to_int(gyro_data.gyrodata.z) / 1000;
+		gyro_input.in_angel_x_value = amd_sfh_float_to_int(gyro_data.gyrodata.x) / 1000;
+		gyro_input.in_angel_y_value = amd_sfh_float_to_int(gyro_data.gyrodata.y) / 1000;
+		gyro_input.in_angel_z_value = amd_sfh_float_to_int(gyro_data.gyrodata.z) / 1000;
 		memcpy(input_report, &gyro_input, sizeof(gyro_input));
 		report_size = sizeof(gyro_input);
 		break;
@@ -223,9 +223,9 @@ static u8 get_input_rep(u8 current_index, int sensor_idx, int report_id,
 			     OFFSET_SENSOR_DATA_DEFAULT;
 		memcpy_fromio(&mag_data, sensoraddr, sizeof(struct sfh_mag_data));
 		get_common_inputs(&magno_input.common_property, report_id);
-		magno_input.in_magno_x = float_to_int(mag_data.magdata.x) / 100;
-		magno_input.in_magno_y = float_to_int(mag_data.magdata.y) / 100;
-		magno_input.in_magno_z = float_to_int(mag_data.magdata.z) / 100;
+		magno_input.in_magno_x = amd_sfh_float_to_int(mag_data.magdata.x) / 100;
+		magno_input.in_magno_y = amd_sfh_float_to_int(mag_data.magdata.y) / 100;
+		magno_input.in_magno_z = amd_sfh_float_to_int(mag_data.magdata.z) / 100;
 		magno_input.in_magno_accuracy = mag_data.accuracy / 100;
 		memcpy(input_report, &magno_input, sizeof(magno_input));
 		report_size = sizeof(magno_input);
@@ -235,13 +235,15 @@ static u8 get_input_rep(u8 current_index, int sensor_idx, int report_id,
 			     OFFSET_SENSOR_DATA_DEFAULT;
 		memcpy_fromio(&als_data, sensoraddr, sizeof(struct sfh_als_data));
 		get_common_inputs(&als_input.common_property, report_id);
-		als_input.illuminance_value = float_to_int(als_data.lux);
+		als_input.illuminance_value = amd_sfh_float_to_int(als_data.lux);
 
 		memcpy_fromio(&binfo, mp2->vsbase, sizeof(struct sfh_base_info));
 		if (binfo.sbase.s_prop[ALS_IDX].sf.feat & 0x2) {
 			als_input.light_color_temp = als_data.light_color_temp;
-			als_input.chromaticity_x_value = float_to_int(als_data.chromaticity_x);
-			als_input.chromaticity_y_value = float_to_int(als_data.chromaticity_y);
+			als_input.chromaticity_x_value =
+				amd_sfh_float_to_int(als_data.chromaticity_x);
+			als_input.chromaticity_y_value =
+				amd_sfh_float_to_int(als_data.chromaticity_y);
 		}
 
 		report_size = sizeof(als_input);

drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_init.c

@@ -73,6 +73,15 @@ static int amd_sfh_hid_client_deinit(struct amd_mp2_dev *privdata)
 	int i, status;
 
 	for (i = 0; i < cl_data->num_hid_devices; i++) {
+		switch (cl_data->sensor_idx[i]) {
+		case HPD_IDX:
+			privdata->dev_en.is_hpd_present = false;
+			break;
+		case ALS_IDX:
+			privdata->dev_en.is_als_present = false;
+			break;
+		}
+
 		if (cl_data->sensor_sts[i] == SENSOR_ENABLED) {
 			privdata->mp2_ops->stop(privdata, cl_data->sensor_idx[i]);
 			status = amd_sfh_wait_for_response
@@ -178,6 +187,14 @@ static int amd_sfh1_1_hid_client_init(struct amd_mp2_dev *privdata)
 			rc = amdtp_hid_probe(i, cl_data);
 			if (rc)
 				goto cleanup;
+			switch (cl_data->sensor_idx[i]) {
+			case HPD_IDX:
+				privdata->dev_en.is_hpd_present = true;
+				break;
+			case ALS_IDX:
+				privdata->dev_en.is_als_present = true;
+				break;
+			}
 		}
 		dev_dbg(dev, "sid 0x%x (%s) status 0x%x\n",
 			cl_data->sensor_idx[i], get_sensor_name(cl_data->sensor_idx[i]),
@@ -259,6 +276,7 @@ static void amd_mp2_pci_remove(void *privdata)
 {
 	struct amd_mp2_dev *mp2 = privdata;
 
+	sfh_deinit_emp2();
 	amd_sfh_hid_client_deinit(privdata);
 	mp2->mp2_ops->stop_all(mp2);
 	pci_intx(mp2->pdev, false);
@@ -311,12 +329,14 @@ int amd_sfh1_1_init(struct amd_mp2_dev *mp2)
 
 	rc = amd_sfh_irq_init(mp2);
 	if (rc) {
+		sfh_deinit_emp2();
 		dev_err(dev, "amd_sfh_irq_init failed\n");
 		return rc;
 	}
 
 	rc = amd_sfh1_1_hid_client_init(mp2);
 	if (rc) {
+		sfh_deinit_emp2();
 		dev_err(dev, "amd_sfh1_1_hid_client_init failed\n");
 		return rc;
 	}

drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_interface.c

@@ -7,11 +7,14 @@
  *
  * Author: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
  */
+#include <linux/amd-pmf-io.h>
 #include <linux/io-64-nonatomic-lo-hi.h>
 #include <linux/iopoll.h>
 
 #include "amd_sfh_interface.h"
 
+static struct amd_mp2_dev *emp2;
+
 static int amd_sfh_wait_response(struct amd_mp2_dev *mp2, u8 sid, u32 cmd_id)
 {
 	struct sfh_cmd_response cmd_resp;
@@ -73,7 +76,63 @@ static struct amd_mp2_ops amd_sfh_ops = {
 	.response = amd_sfh_wait_response,
 };
 
+void sfh_deinit_emp2(void)
+{
+	emp2 = NULL;
+}
+
 void sfh_interface_init(struct amd_mp2_dev *mp2)
 {
 	mp2->mp2_ops = &amd_sfh_ops;
+	emp2 = mp2;
+}
+
+static int amd_sfh_hpd_info(u8 *user_present)
+{
+	struct hpd_status hpdstatus;
+
+	if (!user_present)
+		return -EINVAL;
+
+	if (!emp2 || !emp2->dev_en.is_hpd_present)
+		return -ENODEV;
+
+	hpdstatus.val = readl(emp2->mmio + AMD_C2P_MSG(4));
+	*user_present = hpdstatus.shpd.presence;
+
+	return 0;
+}
+
+static int amd_sfh_als_info(u32 *ambient_light)
+{
+	struct sfh_als_data als_data;
+	void __iomem *sensoraddr;
+
+	if (!ambient_light)
+		return -EINVAL;
+
+	if (!emp2 || !emp2->dev_en.is_als_present)
+		return -ENODEV;
+
+	sensoraddr = emp2->vsbase +
+		(ALS_IDX * SENSOR_DATA_MEM_SIZE_DEFAULT) +
+		OFFSET_SENSOR_DATA_DEFAULT;
+	memcpy_fromio(&als_data, sensoraddr, sizeof(struct sfh_als_data));
+	*ambient_light = amd_sfh_float_to_int(als_data.lux);
+
+	return 0;
+}
+
+int amd_get_sfh_info(struct amd_sfh_info *sfh_info, enum sfh_message_type op)
+{
+	if (sfh_info) {
+		switch (op) {
+		case MT_HPD:
+			return amd_sfh_hpd_info(&sfh_info->user_present);
+		case MT_ALS:
+			return amd_sfh_als_info(&sfh_info->ambient_light);
+		}
+	}
+	return -EINVAL;
 }
+EXPORT_SYMBOL_GPL(amd_get_sfh_info);

drivers/hid/amd-sfh-hid/sfh1_1/amd_sfh_interface.h

@@ -165,5 +165,7 @@ struct hpd_status {
 };
 
 void sfh_interface_init(struct amd_mp2_dev *mp2);
+void sfh_deinit_emp2(void);
 void amd_sfh1_1_set_desc_ops(struct amd_mp2_ops *mp2_ops);
+int amd_sfh_float_to_int(u32 flt32_val);
 #endif

drivers/hid/hid-core.c

@@ -2749,7 +2749,7 @@ static int hid_uevent(const struct device *dev, struct kobj_uevent_env *env)
 	return 0;
 }
 
-struct bus_type hid_bus_type = {
+const struct bus_type hid_bus_type = {
 	.name		= "hid",
 	.dev_groups	= hid_dev_groups,
 	.drv_groups	= hid_drv_groups,

drivers/hid/hid-ids.h

@@ -916,6 +916,7 @@
 #define USB_DEVICE_ID_PICK16F1454	0x0042
 #define USB_DEVICE_ID_PICK16F1454_V2	0xf2f7
 #define USB_DEVICE_ID_LUXAFOR		0xf372
+#define USB_DEVICE_ID_MCP2200		0x00df
 #define USB_DEVICE_ID_MCP2221		0x00dd
 
 #define USB_VENDOR_ID_MICROSOFT		0x045e
@@ -987,7 +988,10 @@
 #define USB_DEVICE_ID_NINTENDO_JOYCONL	0x2006
 #define USB_DEVICE_ID_NINTENDO_JOYCONR	0x2007
 #define USB_DEVICE_ID_NINTENDO_PROCON	0x2009
-#define USB_DEVICE_ID_NINTENDO_CHRGGRIP	0x200E
+#define USB_DEVICE_ID_NINTENDO_CHRGGRIP	0x200e
+#define USB_DEVICE_ID_NINTENDO_SNESCON	0x2017
+#define USB_DEVICE_ID_NINTENDO_GENCON	0x201e
+#define USB_DEVICE_ID_NINTENDO_N64CON	0x2019
 
 #define USB_VENDOR_ID_NOVATEK		0x0603
 #define USB_DEVICE_ID_NOVATEK_PCT	0x0600

drivers/hid/hid-magicmouse.c

@@ -120,6 +120,9 @@ MODULE_PARM_DESC(report_undeciphered, "Report undeciphered multi-touch state fie
  * @scroll_jiffies: Time of last scroll motion.
  * @touches: Most recent data for a touch, indexed by tracking ID.
  * @tracking_ids: Mapping of current touch input data to @touches.
+ * @hdev: Pointer to the underlying HID device.
+ * @work: Workqueue to handle initialization retry for quirky devices.
+ * @battery_timer: Timer for obtaining battery level information.
  */
 struct magicmouse_sc {
 	struct input_dev *input;

drivers/hid/hid-mcp2200.c

+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * MCP2200 - Microchip USB to GPIO bridge
+ *
+ * Copyright (c) 2023, Johannes Roith <johannes@gnu-linux.rocks>
+ *
+ * Datasheet: https://ww1.microchip.com/downloads/en/DeviceDoc/22228A.pdf
+ * App Note for HID: https://ww1.microchip.com/downloads/en/DeviceDoc/93066A.pdf
+ */
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio/driver.h>
+#include <linux/hid.h>
+#include <linux/hidraw.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include "hid-ids.h"
+
+/* Commands codes in a raw output report */
+#define SET_CLEAR_OUTPUTS	0x08
+#define CONFIGURE		0x10
+#define READ_EE			0x20
+#define WRITE_EE		0x40
+#define READ_ALL		0x80
+
+/* MCP GPIO direction encoding */
+enum MCP_IO_DIR {
+	MCP2200_DIR_OUT = 0x00,
+	MCP2200_DIR_IN  = 0x01,
+};
+
+/* Altternative pin assignments */
+#define TXLED		2
+#define RXLED		3
+#define USBCFG		6
+#define SSPND		7
+#define MCP_NGPIO	8
+
+/* CMD to set or clear a GPIO output */
+struct mcp_set_clear_outputs {
+	u8 cmd;
+	u8 dummys1[10];
+	u8 set_bmap;
+	u8 clear_bmap;
+	u8 dummys2[3];
+} __packed;
+
+/* CMD to configure the IOs */
+struct mcp_configure {
+	u8 cmd;
+	u8 dummys1[3];
+	u8 io_bmap;
+	u8 config_alt_pins;
+	u8 io_default_val_bmap;
+	u8 config_alt_options;
+	u8 baud_h;
+	u8 baud_l;
+	u8 dummys2[6];
+} __packed;
+
+/* CMD to read all parameters */
+struct mcp_read_all {
+	u8 cmd;
+	u8 dummys[15];
+} __packed;
+
+/* Response to the read all cmd */
+struct mcp_read_all_resp {
+	u8 cmd;
+	u8 eep_addr;
+	u8 dummy;
+	u8 eep_val;
+	u8 io_bmap;
+	u8 config_alt_pins;
+	u8 io_default_val_bmap;
+	u8 config_alt_options;
+	u8 baud_h;
+	u8 baud_l;
+	u8 io_port_val_bmap;
+	u8 dummys[5];
+} __packed;
+
+struct mcp2200 {
+	struct hid_device *hdev;
+	struct mutex lock;
+	struct completion wait_in_report;
+	u8 gpio_dir;
+	u8 gpio_val;
+	u8 gpio_inval;
+	u8 baud_h;
+	u8 baud_l;
+	u8 config_alt_pins;
+	u8 gpio_reset_val;
+	u8 config_alt_options;
+	int status;
+	struct gpio_chip gc;
+	u8 hid_report[16];
+};
+
+/* this executes the READ_ALL cmd */
+static int mcp_cmd_read_all(struct mcp2200 *mcp)
+{
+	struct mcp_read_all *read_all;
+	int len, t;
+
+	reinit_completion(&mcp->wait_in_report);
+
+	mutex_lock(&mcp->lock);
+
+	read_all = (struct mcp_read_all *) mcp->hid_report;
+	read_all->cmd = READ_ALL;
+	len = hid_hw_output_report(mcp->hdev, (u8 *) read_all,
+				   sizeof(struct mcp_read_all));
+
+	mutex_unlock(&mcp->lock);
+
+	if (len != sizeof(struct mcp_read_all))
+		return -EINVAL;
+
+	t = wait_for_completion_timeout(&mcp->wait_in_report,
+					msecs_to_jiffies(4000));
+	if (!t)
+		return -ETIMEDOUT;
+
+	/* return status, negative value if wrong response was received */
+	return mcp->status;
+}
+
+static void mcp_set_multiple(struct gpio_chip *gc, unsigned long *mask,
+			     unsigned long *bits)
+{
+	struct mcp2200 *mcp = gpiochip_get_data(gc);
+	u8 value;
+	int status;
+	struct mcp_set_clear_outputs *cmd;
+
+	mutex_lock(&mcp->lock);
+	cmd = (struct mcp_set_clear_outputs *) mcp->hid_report;
+
+	value = mcp->gpio_val & ~*mask;
+	value |= (*mask & *bits);
+
+	cmd->cmd = SET_CLEAR_OUTPUTS;
+	cmd->set_bmap = value;
+	cmd->clear_bmap = ~(value);
+
+	status = hid_hw_output_report(mcp->hdev, (u8 *) cmd,
+		       sizeof(struct mcp_set_clear_outputs));
+
+	if (status == sizeof(struct mcp_set_clear_outputs))
+		mcp->gpio_val = value;
+
+	mutex_unlock(&mcp->lock);
+}
+
+static void mcp_set(struct gpio_chip *gc, unsigned int gpio_nr, int value)
+{
+	unsigned long mask = 1 << gpio_nr;
+	unsigned long bmap_value = value << gpio_nr;
+
+	mcp_set_multiple(gc, &mask, &bmap_value);
+}
+
+static int mcp_get_multiple(struct gpio_chip *gc, unsigned long *mask,
+		unsigned long *bits)
+{
+	u32 val;
+	struct mcp2200 *mcp = gpiochip_get_data(gc);
+	int status;
+
+	status = mcp_cmd_read_all(mcp);
+	if (status)
+		return status;
+
+	val = mcp->gpio_inval;
+	*bits = (val & *mask);
+	return 0;
+}
+
+static int mcp_get(struct gpio_chip *gc, unsigned int gpio_nr)
+{
+	unsigned long mask = 0, bits = 0;
+
+	mask = (1 << gpio_nr);
+	mcp_get_multiple(gc, &mask, &bits);
+	return bits > 0;
+}
+
+static int mcp_get_direction(struct gpio_chip *gc, unsigned int gpio_nr)
+{
+	struct mcp2200 *mcp = gpiochip_get_data(gc);
+
+	return (mcp->gpio_dir & (MCP2200_DIR_IN << gpio_nr))
+		? GPIO_LINE_DIRECTION_IN : GPIO_LINE_DIRECTION_OUT;
+}
+
+static int mcp_set_direction(struct gpio_chip *gc, unsigned int gpio_nr,
+			     enum MCP_IO_DIR io_direction)
+{
+	struct mcp2200 *mcp = gpiochip_get_data(gc);
+	struct mcp_configure *conf;
+	int status;
+	/* after the configure cmd we will need to set the outputs again */
+	unsigned long mask = ~(mcp->gpio_dir); /* only set outputs */
+	unsigned long bits = mcp->gpio_val;
+	/* Offsets of alternative pins in config_alt_pins, 0 is not used */
+	u8 alt_pin_conf[8] = {SSPND, USBCFG, 0, 0, 0, 0, RXLED, TXLED};
+	u8 config_alt_pins = mcp->config_alt_pins;
+
+	/* Read in the reset baudrate first, we need it later */
+	status = mcp_cmd_read_all(mcp);
+	if (status != 0)
+		return status;
+
+	mutex_lock(&mcp->lock);
+	conf = (struct mcp_configure  *) mcp->hid_report;
+
+	/* configure will reset the chip! */
+	conf->cmd = CONFIGURE;
+	conf->io_bmap = (mcp->gpio_dir & ~(1 << gpio_nr))
+		| (io_direction << gpio_nr);
+	/* Don't overwrite the reset parameters */
+	conf->baud_h = mcp->baud_h;
+	conf->baud_l = mcp->baud_l;
+	conf->config_alt_options = mcp->config_alt_options;
+	conf->io_default_val_bmap = mcp->gpio_reset_val;
+	/* Adjust alt. func if necessary */
+	if (alt_pin_conf[gpio_nr])
+		config_alt_pins &= ~(1 << alt_pin_conf[gpio_nr]);
+	conf->config_alt_pins = config_alt_pins;
+
+	status = hid_hw_output_report(mcp->hdev, (u8 *) conf,
+				      sizeof(struct mcp_set_clear_outputs));
+
+	if (status == sizeof(struct mcp_set_clear_outputs)) {
+		mcp->gpio_dir = conf->io_bmap;
+		mcp->config_alt_pins = config_alt_pins;
+	} else {
+		mutex_unlock(&mcp->lock);
+		return -EIO;
+	}
+
+	mutex_unlock(&mcp->lock);
+
+	/* Configure CMD will clear all IOs -> rewrite them */
+	mcp_set_multiple(gc, &mask, &bits);
+	return 0;
+}
+
+static int mcp_direction_input(struct gpio_chip *gc, unsigned int gpio_nr)
+{
+	return mcp_set_direction(gc, gpio_nr, MCP2200_DIR_IN);
+}
+
+static int mcp_direction_output(struct gpio_chip *gc, unsigned int gpio_nr,
+				int value)
+{
+	int ret;
+	unsigned long mask, bmap_value;
+
+	mask = 1 << gpio_nr;
+	bmap_value = value << gpio_nr;
+
+	ret = mcp_set_direction(gc, gpio_nr, MCP2200_DIR_OUT);
+	if (!ret)
+		mcp_set_multiple(gc, &mask, &bmap_value);
+	return ret;
+}
+
+static const struct gpio_chip template_chip = {
+	.label			= "mcp2200",
+	.owner			= THIS_MODULE,
+	.get_direction		= mcp_get_direction,
+	.direction_input	= mcp_direction_input,
+	.direction_output	= mcp_direction_output,
+	.set			= mcp_set,
+	.set_multiple		= mcp_set_multiple,
+	.get			= mcp_get,
+	.get_multiple		= mcp_get_multiple,
+	.base			= -1,
+	.ngpio			= MCP_NGPIO,
+	.can_sleep		= true,
+};
+
+/*
+ * MCP2200 uses interrupt endpoint for input reports. This function
+ * is called by HID layer when it receives i/p report from mcp2200,
+ * which is actually a response to the previously sent command.
+ */
+static int mcp2200_raw_event(struct hid_device *hdev, struct hid_report *report,
+		u8 *data, int size)
+{
+	struct mcp2200 *mcp = hid_get_drvdata(hdev);
+	struct mcp_read_all_resp *all_resp;
+
+	switch (data[0]) {
+	case READ_ALL:
+		all_resp = (struct mcp_read_all_resp *) data;
+		mcp->status = 0;
+		mcp->gpio_inval = all_resp->io_port_val_bmap;
+		mcp->baud_h = all_resp->baud_h;
+		mcp->baud_l = all_resp->baud_l;
+		mcp->gpio_reset_val = all_resp->io_default_val_bmap;
+		mcp->config_alt_pins = all_resp->config_alt_pins;
+		mcp->config_alt_options = all_resp->config_alt_options;
+		break;
+	default:
+		mcp->status = -EIO;
+		break;
+	}
+
+	complete(&mcp->wait_in_report);
+	return 0;
+}
+
+static int mcp2200_probe(struct hid_device *hdev, const struct hid_device_id *id)
+{
+	int ret;
+	struct mcp2200 *mcp;
+
+	mcp = devm_kzalloc(&hdev->dev, sizeof(*mcp), GFP_KERNEL);
+	if (!mcp)
+		return -ENOMEM;
+
+	ret = hid_parse(hdev);
+	if (ret) {
+		hid_err(hdev, "can't parse reports\n");
+		return ret;
+	}
+
+	ret = hid_hw_start(hdev, 0);
+	if (ret) {
+		hid_err(hdev, "can't start hardware\n");
+		return ret;
+	}
+
+	hid_info(hdev, "USB HID v%x.%02x Device [%s] on %s\n", hdev->version >> 8,
+			hdev->version & 0xff, hdev->name, hdev->phys);
+
+	ret = hid_hw_open(hdev);
+	if (ret) {
+		hid_err(hdev, "can't open device\n");
+		hid_hw_stop(hdev);
+		return ret;
+	}
+
+	mutex_init(&mcp->lock);
+	init_completion(&mcp->wait_in_report);
+	hid_set_drvdata(hdev, mcp);
+	mcp->hdev = hdev;
+
+	mcp->gc = template_chip;
+	mcp->gc.parent = &hdev->dev;
+
+	ret = devm_gpiochip_add_data(&hdev->dev, &mcp->gc, mcp);
+	if (ret < 0) {
+		hid_err(hdev, "Unable to register gpiochip\n");
+		hid_hw_close(hdev);
+		hid_hw_stop(hdev);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void mcp2200_remove(struct hid_device *hdev)
+{
+	hid_hw_close(hdev);
+	hid_hw_stop(hdev);
+}
+
+static const struct hid_device_id mcp2200_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_MICROCHIP, USB_DEVICE_ID_MCP2200) },
+	{ }
+};
+MODULE_DEVICE_TABLE(hid, mcp2200_devices);
+
+static struct hid_driver mcp2200_driver = {
+	.name		= "mcp2200",
+	.id_table	= mcp2200_devices,
+	.probe		= mcp2200_probe,
+	.remove		= mcp2200_remove,
+	.raw_event	= mcp2200_raw_event,
+};
+
+/* Register with HID core */
+module_hid_driver(mcp2200_driver);
+
+MODULE_AUTHOR("Johannes Roith <johannes@gnu-linux.rocks>");
+MODULE_DESCRIPTION("MCP2200 Microchip HID USB to GPIO bridge");
+MODULE_LICENSE("GPL");

drivers/hid/hid-mcp2221.c

@@ -49,6 +49,7 @@ enum {
 	MCP2221_I2C_MASK_ADDR_NACK = 0x40,
 	MCP2221_I2C_WRADDRL_SEND = 0x21,
 	MCP2221_I2C_ADDR_NACK = 0x25,
+	MCP2221_I2C_READ_PARTIAL = 0x54,
 	MCP2221_I2C_READ_COMPL = 0x55,
 	MCP2221_ALT_F_NOT_GPIOV = 0xEE,
 	MCP2221_ALT_F_NOT_GPIOD = 0xEF,
@@ -187,6 +188,25 @@ static int mcp_cancel_last_cmd(struct mcp2221 *mcp)
 	return mcp_send_data_req_status(mcp, mcp->txbuf, 8);
 }
 
+/* Check if the last command succeeded or failed and return the result.
+ * If the command did fail, cancel that command which will free the i2c bus.
+ */
+static int mcp_chk_last_cmd_status_free_bus(struct mcp2221 *mcp)
+{
+	int ret;
+
+	ret = mcp_chk_last_cmd_status(mcp);
+	if (ret) {
+		/* The last command was a failure.
+		 * Send a cancel which will also free the bus.
+		 */
+		usleep_range(980, 1000);
+		mcp_cancel_last_cmd(mcp);
+	}
+
+	return ret;
+}
+
 static int mcp_set_i2c_speed(struct mcp2221 *mcp)
 {
 	int ret;
@@ -241,7 +261,7 @@ static int mcp_i2c_write(struct mcp2221 *mcp,
 		usleep_range(980, 1000);
 
 		if (last_status) {
-			ret = mcp_chk_last_cmd_status(mcp);
+			ret = mcp_chk_last_cmd_status_free_bus(mcp);
 			if (ret)
 				return ret;
 		}
@@ -278,6 +298,7 @@ static int mcp_i2c_smbus_read(struct mcp2221 *mcp,
 {
 	int ret;
 	u16 total_len;
+	int retries = 0;
 
 	mcp->txbuf[0] = type;
 	if (msg) {
@@ -301,19 +322,30 @@ static int mcp_i2c_smbus_read(struct mcp2221 *mcp,
 	mcp->rxbuf_idx = 0;
 
 	do {
+		/* Wait for the data to be read by the device */
+		usleep_range(980, 1000);
+
 		memset(mcp->txbuf, 0, 4);
 		mcp->txbuf[0] = MCP2221_I2C_GET_DATA;
 
 		ret = mcp_send_data_req_status(mcp, mcp->txbuf, 1);
-		if (ret)
-			return ret;
-
-		ret = mcp_chk_last_cmd_status(mcp);
-		if (ret)
+		if (ret) {
+			if (retries < 5) {
+				/* The data wasn't ready to read.
+				 * Wait a bit longer and try again.
+				 */
+				usleep_range(90, 100);
+				retries++;
+			} else {
 				return ret;
+			}
+		} else {
+			retries = 0;
+		}
+	} while (mcp->rxbuf_idx < total_len);
 
 	usleep_range(980, 1000);
-	} while (mcp->rxbuf_idx < total_len);
+	ret = mcp_chk_last_cmd_status_free_bus(mcp);
 
 	return ret;
 }
@@ -328,11 +360,6 @@ static int mcp_i2c_xfer(struct i2c_adapter *adapter,
 
 	mutex_lock(&mcp->lock);
 
-	/* Setting speed before every transaction is required for mcp2221 */
-	ret = mcp_set_i2c_speed(mcp);
-	if (ret)
-		goto exit;
-
 	if (num == 1) {
 		if (msgs->flags & I2C_M_RD) {
 			ret = mcp_i2c_smbus_read(mcp, msgs, MCP2221_I2C_RD_DATA,
@@ -417,9 +444,7 @@ static int mcp_smbus_write(struct mcp2221 *mcp, u16 addr,
 	if (last_status) {
 		usleep_range(980, 1000);
 
-		ret = mcp_chk_last_cmd_status(mcp);
-		if (ret)
-			return ret;
+		ret = mcp_chk_last_cmd_status_free_bus(mcp);
 	}
 
 	return ret;
@@ -437,10 +462,6 @@ static int mcp_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
 
 	mutex_lock(&mcp->lock);
 
-	ret = mcp_set_i2c_speed(mcp);
-	if (ret)
-		goto exit;
-
 	switch (size) {
 
 	case I2C_SMBUS_QUICK:
@@ -791,7 +812,8 @@ static int mcp2221_raw_event(struct hid_device *hdev,
 				mcp->status = -EIO;
 				break;
 			}
-			if (data[2] == MCP2221_I2C_READ_COMPL) {
+			if (data[2] == MCP2221_I2C_READ_COMPL ||
+			    data[2] == MCP2221_I2C_READ_PARTIAL) {
 				buf = mcp->rxbuf;
 				memcpy(&buf[mcp->rxbuf_idx], &data[4], data[3]);
 				mcp->rxbuf_idx = mcp->rxbuf_idx + data[3];
@@ -1150,12 +1172,18 @@ static int mcp2221_probe(struct hid_device *hdev,
 	if (i2c_clk_freq < 50)
 		i2c_clk_freq = 50;
 	mcp->cur_i2c_clk_div = (12000000 / (i2c_clk_freq * 1000)) - 3;
+	ret = mcp_set_i2c_speed(mcp);
+	if (ret) {
+		hid_err(hdev, "can't set i2c speed: %d\n", ret);
+		return ret;
+	}
 
 	mcp->adapter.owner = THIS_MODULE;
 	mcp->adapter.class = I2C_CLASS_HWMON;
 	mcp->adapter.algo = &mcp_i2c_algo;
 	mcp->adapter.retries = 1;
 	mcp->adapter.dev.parent = &hdev->dev;
+	ACPI_COMPANION_SET(&mcp->adapter.dev, ACPI_COMPANION(hdev->dev.parent));
 	snprintf(mcp->adapter.name, sizeof(mcp->adapter.name),
 			"MCP2221 usb-i2c bridge");
 

drivers/hid/hid-sensor-hub.c

@@ -632,7 +632,7 @@ static int sensor_hub_probe(struct hid_device *hdev,
 	}
 	INIT_LIST_HEAD(&hdev->inputs);
 
-	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT | HID_CONNECT_DRIVER);
 	if (ret) {
 		hid_err(hdev, "hw start failed\n");
 		return ret;

drivers/hid/i2c-hid/i2c-hid-core.c

@@ -44,12 +44,11 @@
 #include "i2c-hid.h"
 
 /* quirks to control the device */
-#define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV	BIT(0)
-#define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET	BIT(1)
-#define I2C_HID_QUIRK_BOGUS_IRQ			BIT(4)
-#define I2C_HID_QUIRK_RESET_ON_RESUME		BIT(5)
-#define I2C_HID_QUIRK_BAD_INPUT_SIZE		BIT(6)
-#define I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET	BIT(7)
+#define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET	BIT(0)
+#define I2C_HID_QUIRK_BOGUS_IRQ			BIT(1)
+#define I2C_HID_QUIRK_RESET_ON_RESUME		BIT(2)
+#define I2C_HID_QUIRK_BAD_INPUT_SIZE		BIT(3)
+#define I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET	BIT(4)
 
 /* Command opcodes */
 #define I2C_HID_OPCODE_RESET			0x01
@@ -120,8 +119,6 @@ static const struct i2c_hid_quirks {
 	__u16 idProduct;
 	__u32 quirks;
 } i2c_hid_quirks[] = {
-	{ USB_VENDOR_ID_WEIDA, HID_ANY_ID,
-		I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
 	{ I2C_VENDOR_ID_HANTICK, I2C_PRODUCT_ID_HANTICK_5288,
 		I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
 	{ I2C_VENDOR_ID_ITE, I2C_DEVICE_ID_ITE_VOYO_WINPAD_A15,
@@ -395,8 +392,7 @@ static int i2c_hid_set_power(struct i2c_hid *ihid, int power_state)
 	 * The call will get a return value (EREMOTEIO) but device will be
 	 * triggered and activated. After that, it goes like a normal device.
 	 */
-	if (power_state == I2C_HID_PWR_ON &&
-	    ihid->quirks & I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV) {
+	if (power_state == I2C_HID_PWR_ON) {
 		ret = i2c_hid_set_power_command(ihid, I2C_HID_PWR_ON);
 
 		/* Device was already activated */
@@ -426,12 +422,23 @@ static int i2c_hid_set_power(struct i2c_hid *ihid, int power_state)
 	return ret;
 }
 
-static int i2c_hid_execute_reset(struct i2c_hid *ihid)
+static int i2c_hid_start_hwreset(struct i2c_hid *ihid)
 {
 	size_t length = 0;
 	int ret;
 
-	i2c_hid_dbg(ihid, "resetting...\n");
+	i2c_hid_dbg(ihid, "%s\n", __func__);
+
+	/*
+	 * This prevents sending feature reports while the device is
+	 * being reset. Otherwise we may lose the reset complete
+	 * interrupt.
+	 */
+	lockdep_assert_held(&ihid->reset_lock);
+
+	ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON);
+	if (ret)
+		return ret;
 
 	/* Prepare reset command. Command register goes first. */
 	*(__le16 *)ihid->cmdbuf = ihid->hdesc.wCommandRegister;
@@ -444,60 +451,40 @@ static int i2c_hid_execute_reset(struct i2c_hid *ihid)
 
 	ret = i2c_hid_xfer(ihid, ihid->cmdbuf, length, NULL, 0);
 	if (ret) {
-		dev_err(&ihid->client->dev, "failed to reset device.\n");
-		goto out;
-	}
-
-	if (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET) {
-		msleep(100);
-		goto out;
+		dev_err(&ihid->client->dev,
+			"failed to reset device: %d\n", ret);
+		goto err_clear_reset;
 	}
 
-	i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
-	if (!wait_event_timeout(ihid->wait,
-				!test_bit(I2C_HID_RESET_PENDING, &ihid->flags),
-				msecs_to_jiffies(5000))) {
-		ret = -ENODATA;
-		goto out;
-	}
-	i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
+	return 0;
 
-out:
+err_clear_reset:
 	clear_bit(I2C_HID_RESET_PENDING, &ihid->flags);
+	i2c_hid_set_power(ihid, I2C_HID_PWR_SLEEP);
 	return ret;
 }
 
-static int i2c_hid_hwreset(struct i2c_hid *ihid)
+static int i2c_hid_finish_hwreset(struct i2c_hid *ihid)
 {
-	int ret;
-
-	i2c_hid_dbg(ihid, "%s\n", __func__);
+	int ret = 0;
 
-	/*
-	 * This prevents sending feature reports while the device is
-	 * being reset. Otherwise we may lose the reset complete
-	 * interrupt.
-	 */
-	mutex_lock(&ihid->reset_lock);
-
-	ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON);
-	if (ret)
-		goto out_unlock;
+	i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
 
-	ret = i2c_hid_execute_reset(ihid);
-	if (ret) {
-		dev_err(&ihid->client->dev,
-			"failed to reset device: %d\n", ret);
-		i2c_hid_set_power(ihid, I2C_HID_PWR_SLEEP);
-		goto out_unlock;
+	if (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET) {
+		msleep(100);
+		clear_bit(I2C_HID_RESET_PENDING, &ihid->flags);
+	} else if (!wait_event_timeout(ihid->wait,
+				       !test_bit(I2C_HID_RESET_PENDING, &ihid->flags),
+				       msecs_to_jiffies(1000))) {
+		dev_warn(&ihid->client->dev, "device did not ack reset within 1000 ms\n");
+		clear_bit(I2C_HID_RESET_PENDING, &ihid->flags);
 	}
+	i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
 
 	/* At least some SIS devices need this after reset */
 	if (!(ihid->quirks & I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET))
 		ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON);
 
-out_unlock:
-	mutex_unlock(&ihid->reset_lock);
 	return ret;
 }
 
@@ -729,11 +716,10 @@ static int i2c_hid_parse(struct hid_device *hid)
 	struct i2c_client *client = hid->driver_data;
 	struct i2c_hid *ihid = i2c_get_clientdata(client);
 	struct i2c_hid_desc *hdesc = &ihid->hdesc;
+	char *rdesc = NULL, *use_override = NULL;
 	unsigned int rsize;
-	char *rdesc;
 	int ret;
 	int tries = 3;
-	char *use_override;
 
 	i2c_hid_dbg(ihid, "entering %s\n", __func__);
 
@@ -743,14 +729,15 @@ static int i2c_hid_parse(struct hid_device *hid)
 		return -EINVAL;
 	}
 
+	mutex_lock(&ihid->reset_lock);
 	do {
-		ret = i2c_hid_hwreset(ihid);
+		ret = i2c_hid_start_hwreset(ihid);
 		if (ret)
 			msleep(1000);
 	} while (tries-- > 0 && ret);
 
 	if (ret)
-		return ret;
+		goto abort_reset;
 
 	use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name,
 								&rsize);
@@ -762,8 +749,8 @@ static int i2c_hid_parse(struct hid_device *hid)
 		rdesc = kzalloc(rsize, GFP_KERNEL);
 
 		if (!rdesc) {
-			dbg_hid("couldn't allocate rdesc memory\n");
-			return -ENOMEM;
+			ret = -ENOMEM;
+			goto abort_reset;
 		}
 
 		i2c_hid_dbg(ihid, "asking HID report descriptor\n");
@@ -773,23 +760,34 @@ static int i2c_hid_parse(struct hid_device *hid)
 					    rdesc, rsize);
 		if (ret) {
 			hid_err(hid, "reading report descriptor failed\n");
-			kfree(rdesc);
-			return -EIO;
+			goto abort_reset;
 		}
 	}
 
+	/*
+	 * Windows directly reads the report-descriptor after sending reset
+	 * and then waits for resets completion afterwards. Some touchpads
+	 * actually wait for the report-descriptor to be read before signalling
+	 * reset completion.
+	 */
+	ret = i2c_hid_finish_hwreset(ihid);
+abort_reset:
+	clear_bit(I2C_HID_RESET_PENDING, &ihid->flags);
+	mutex_unlock(&ihid->reset_lock);
+	if (ret)
+		goto out;
+
 	i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
 
 	ret = hid_parse_report(hid, rdesc, rsize);
+	if (ret)
+		dbg_hid("parsing report descriptor failed\n");
+
+out:
 	if (!use_override)
 		kfree(rdesc);
 
-	if (ret) {
-		dbg_hid("parsing report descriptor failed\n");
 	return ret;
-	}
-
-	return 0;
 }
 
 static int i2c_hid_start(struct hid_device *hid)
@@ -987,10 +985,15 @@ static int i2c_hid_core_resume(struct i2c_hid *ihid)
 	 * However some ALPS touchpads generate IRQ storm without reset, so
 	 * let's still reset them here.
 	 */
-	if (ihid->quirks & I2C_HID_QUIRK_RESET_ON_RESUME)
-		ret = i2c_hid_hwreset(ihid);
-	else
+	if (ihid->quirks & I2C_HID_QUIRK_RESET_ON_RESUME) {
+		mutex_lock(&ihid->reset_lock);
+		ret = i2c_hid_start_hwreset(ihid);
+		if (ret == 0)
+			ret = i2c_hid_finish_hwreset(ihid);
+		mutex_unlock(&ihid->reset_lock);
+	} else {
 		ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON);
+	}
 
 	if (ret)
 		return ret;

drivers/hid/i2c-hid/i2c-hid-of-elan.c

@@ -130,9 +130,17 @@ static const struct elan_i2c_hid_chip_data ilitek_ili9882t_chip_data = {
 	.main_supply_name = NULL,
 };
 
+static const struct elan_i2c_hid_chip_data ilitek_ili2901_chip_data = {
+	.post_power_delay_ms = 10,
+	.post_gpio_reset_on_delay_ms = 100,
+	.hid_descriptor_address = 0x0001,
+	.main_supply_name = "vcc33",
+};
+
 static const struct of_device_id elan_i2c_hid_of_match[] = {
 	{ .compatible = "elan,ekth6915", .data = &elan_ekth6915_chip_data },
 	{ .compatible = "ilitek,ili9882t", .data = &ilitek_ili9882t_chip_data },
+	{ .compatible = "ilitek,ili2901", .data = &ilitek_ili2901_chip_data },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, elan_i2c_hid_of_match);

drivers/hid/intel-ish-hid/ipc/pci-ish.c

@@ -119,50 +119,6 @@ static inline bool ish_should_leave_d0i3(struct pci_dev *pdev)
 	return !pm_resume_via_firmware() || pdev->device == CHV_DEVICE_ID;
 }
 
-static int enable_gpe(struct device *dev)
-{
-#ifdef CONFIG_ACPI
-	acpi_status acpi_sts;
-	struct acpi_device *adev;
-	struct acpi_device_wakeup *wakeup;
-
-	adev = ACPI_COMPANION(dev);
-	if (!adev) {
-		dev_err(dev, "get acpi handle failed\n");
-		return -ENODEV;
-	}
-	wakeup = &adev->wakeup;
-
-	/*
-	 * Call acpi_disable_gpe(), so that reference count
-	 * gpe_event_info->runtime_count doesn't overflow.
-	 * When gpe_event_info->runtime_count = 0, the call
-	 * to acpi_disable_gpe() simply return.
-	 */
-	acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
-
-	acpi_sts = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number);
-	if (ACPI_FAILURE(acpi_sts)) {
-		dev_err(dev, "enable ose_gpe failed\n");
-		return -EIO;
-	}
-
-	return 0;
-#else
-	return -ENODEV;
-#endif
-}
-
-static void enable_pme_wake(struct pci_dev *pdev)
-{
-	if ((pci_pme_capable(pdev, PCI_D0) ||
-	     pci_pme_capable(pdev, PCI_D3hot) ||
-	     pci_pme_capable(pdev, PCI_D3cold)) && !enable_gpe(&pdev->dev)) {
-		pci_pme_active(pdev, true);
-		dev_dbg(&pdev->dev, "ish ipc driver pme wake enabled\n");
-	}
-}
-
 /**
  * ish_probe() - PCI driver probe callback
  * @pdev:	pci device
@@ -233,7 +189,7 @@ static int ish_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	/* Enable PME for EHL */
 	if (pdev->device == EHL_Ax_DEVICE_ID)
-		enable_pme_wake(pdev);
+		device_init_wakeup(dev, true);
 
 	ret = ish_init(ishtp);
 	if (ret)
@@ -256,6 +212,19 @@ static void ish_remove(struct pci_dev *pdev)
 	ish_device_disable(ishtp_dev);
 }
 
+
+/**
+ * ish_shutdown() - PCI driver shutdown callback
+ * @pdev:	pci device
+ *
+ * This function sets up wakeup for S5
+ */
+static void ish_shutdown(struct pci_dev *pdev)
+{
+	if (pdev->device == EHL_Ax_DEVICE_ID)
+		pci_prepare_to_sleep(pdev);
+}
+
 static struct device __maybe_unused *ish_resume_device;
 
 /* 50ms to get resume response */
@@ -378,13 +347,6 @@ static int __maybe_unused ish_resume(struct device *device)
 	struct pci_dev *pdev = to_pci_dev(device);
 	struct ishtp_device *dev = pci_get_drvdata(pdev);
 
-	/* add this to finish power flow for EHL */
-	if (dev->pdev->device == EHL_Ax_DEVICE_ID) {
-		pci_set_power_state(pdev, PCI_D0);
-		enable_pme_wake(pdev);
-		dev_dbg(dev->devc, "set power state to D0 for ehl\n");
-	}
-
 	ish_resume_device = device;
 	dev->resume_flag = 1;
 
@@ -400,6 +362,7 @@ static struct pci_driver ish_driver = {
 	.id_table = ish_pci_tbl,
 	.probe = ish_probe,
 	.remove = ish_remove,
+	.shutdown = ish_shutdown,
 	.driver.pm = &ish_pm_ops,
 };
 

drivers/hid/intel-ish-hid/ishtp-fw-loader.c

@@ -840,43 +840,22 @@ static void load_fw_from_host_handler(struct work_struct *work)
  *
  * Return: 0 for success, negative error code for failure
  */
-static int loader_init(struct ishtp_cl *loader_ishtp_cl, int reset)
+static int loader_init(struct ishtp_cl *loader_ishtp_cl, bool reset)
 {
 	int rv;
-	struct ishtp_fw_client *fw_client;
 	struct ishtp_cl_data *client_data =
 		ishtp_get_client_data(loader_ishtp_cl);
 
 	dev_dbg(cl_data_to_dev(client_data), "reset flag: %d\n", reset);
 
-	rv = ishtp_cl_link(loader_ishtp_cl);
-	if (rv < 0) {
-		dev_err(cl_data_to_dev(client_data), "ishtp_cl_link failed\n");
-		return rv;
-	}
-
-	/* Connect to firmware client */
-	ishtp_set_tx_ring_size(loader_ishtp_cl, LOADER_CL_TX_RING_SIZE);
-	ishtp_set_rx_ring_size(loader_ishtp_cl, LOADER_CL_RX_RING_SIZE);
-
-	fw_client =
-		ishtp_fw_cl_get_client(ishtp_get_ishtp_device(loader_ishtp_cl),
-				       &loader_ishtp_id_table[0].guid);
-	if (!fw_client) {
-		dev_err(cl_data_to_dev(client_data),
-			"ISH client uuid not found\n");
-		rv = -ENOENT;
-		goto err_cl_unlink;
-	}
-
-	ishtp_cl_set_fw_client_id(loader_ishtp_cl,
-				  ishtp_get_fw_client_id(fw_client));
-	ishtp_set_connection_state(loader_ishtp_cl, ISHTP_CL_CONNECTING);
-
-	rv = ishtp_cl_connect(loader_ishtp_cl);
+	rv = ishtp_cl_establish_connection(loader_ishtp_cl,
+					   &loader_ishtp_id_table[0].guid,
+					   LOADER_CL_TX_RING_SIZE,
+					   LOADER_CL_RX_RING_SIZE,
+					   reset);
 	if (rv < 0) {
 		dev_err(cl_data_to_dev(client_data), "Client connect fail\n");
-		goto err_cl_unlink;
+		goto err_cl_disconnect;
 	}
 
 	dev_dbg(cl_data_to_dev(client_data), "Client connected\n");
@@ -885,17 +864,14 @@ static int loader_init(struct ishtp_cl *loader_ishtp_cl, int reset)
 
 	return 0;
 
-err_cl_unlink:
-	ishtp_cl_unlink(loader_ishtp_cl);
+err_cl_disconnect:
+	ishtp_cl_destroy_connection(loader_ishtp_cl, reset);
 	return rv;
 }
 
 static void loader_deinit(struct ishtp_cl *loader_ishtp_cl)
 {
-	ishtp_set_connection_state(loader_ishtp_cl, ISHTP_CL_DISCONNECTING);
-	ishtp_cl_disconnect(loader_ishtp_cl);
-	ishtp_cl_unlink(loader_ishtp_cl);
-	ishtp_cl_flush_queues(loader_ishtp_cl);
+	ishtp_cl_destroy_connection(loader_ishtp_cl, false);
 
 	/* Disband and free all Tx and Rx client-level rings */
 	ishtp_cl_free(loader_ishtp_cl);
@@ -914,19 +890,7 @@ static void reset_handler(struct work_struct *work)
 	loader_ishtp_cl = client_data->loader_ishtp_cl;
 	cl_device = client_data->cl_device;
 
-	/* Unlink, flush queues & start again */
-	ishtp_cl_unlink(loader_ishtp_cl);
-	ishtp_cl_flush_queues(loader_ishtp_cl);
-	ishtp_cl_free(loader_ishtp_cl);
-
-	loader_ishtp_cl = ishtp_cl_allocate(cl_device);
-	if (!loader_ishtp_cl)
-		return;
-
-	ishtp_set_drvdata(cl_device, loader_ishtp_cl);
-	ishtp_set_client_data(loader_ishtp_cl, client_data);
-	client_data->loader_ishtp_cl = loader_ishtp_cl;
-	client_data->cl_device = cl_device;
+	ishtp_cl_destroy_connection(loader_ishtp_cl, true);
 
 	rv = loader_init(loader_ishtp_cl, 1);
 	if (rv < 0) {
@@ -974,7 +938,7 @@ static int loader_ishtp_cl_probe(struct ishtp_cl_device *cl_device)
 	INIT_WORK(&client_data->work_fw_load,
 		  load_fw_from_host_handler);
 
-	rv = loader_init(loader_ishtp_cl, 0);
+	rv = loader_init(loader_ishtp_cl, false);
 	if (rv < 0) {
 		ishtp_cl_free(loader_ishtp_cl);
 		return rv;

drivers/hid/intel-ish-hid/ishtp-hid-client.c

@@ -639,47 +639,26 @@ static int ishtp_get_report_descriptor(struct ishtp_cl *hid_ishtp_cl,
  *
  * Return: 0 on success, non zero on error
  */
-static int hid_ishtp_cl_init(struct ishtp_cl *hid_ishtp_cl, int reset)
+static int hid_ishtp_cl_init(struct ishtp_cl *hid_ishtp_cl, bool reset)
 {
-	struct ishtp_device *dev;
 	struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
-	struct ishtp_fw_client *fw_client;
 	int i;
 	int rv;
 
 	dev_dbg(cl_data_to_dev(client_data), "%s\n", __func__);
 	hid_ishtp_trace(client_data,  "%s reset flag: %d\n", __func__, reset);
 
-	rv = ishtp_cl_link(hid_ishtp_cl);
-	if (rv) {
-		dev_err(cl_data_to_dev(client_data),
-			"ishtp_cl_link failed\n");
-		return	-ENOMEM;
-	}
-
 	client_data->init_done = 0;
 
-	dev = ishtp_get_ishtp_device(hid_ishtp_cl);
-
-	/* Connect to FW client */
-	ishtp_set_tx_ring_size(hid_ishtp_cl, HID_CL_TX_RING_SIZE);
-	ishtp_set_rx_ring_size(hid_ishtp_cl, HID_CL_RX_RING_SIZE);
-
-	fw_client = ishtp_fw_cl_get_client(dev, &hid_ishtp_id_table[0].guid);
-	if (!fw_client) {
-		dev_err(cl_data_to_dev(client_data),
-			"ish client uuid not found\n");
-		return -ENOENT;
-	}
-	ishtp_cl_set_fw_client_id(hid_ishtp_cl,
-				  ishtp_get_fw_client_id(fw_client));
-	ishtp_set_connection_state(hid_ishtp_cl, ISHTP_CL_CONNECTING);
-
-	rv = ishtp_cl_connect(hid_ishtp_cl);
+	rv = ishtp_cl_establish_connection(hid_ishtp_cl,
+					   &hid_ishtp_id_table[0].guid,
+					   HID_CL_TX_RING_SIZE,
+					   HID_CL_RX_RING_SIZE,
+					   reset);
 	if (rv) {
 		dev_err(cl_data_to_dev(client_data),
 			"client connect fail\n");
-		goto err_cl_unlink;
+		goto err_cl_disconnect;
 	}
 
 	hid_ishtp_trace(client_data,  "%s client connected\n", __func__);
@@ -723,10 +702,7 @@ static int hid_ishtp_cl_init(struct ishtp_cl *hid_ishtp_cl, int reset)
 	return 0;
 
 err_cl_disconnect:
-	ishtp_set_connection_state(hid_ishtp_cl, ISHTP_CL_DISCONNECTING);
-	ishtp_cl_disconnect(hid_ishtp_cl);
-err_cl_unlink:
-	ishtp_cl_unlink(hid_ishtp_cl);
+	ishtp_cl_destroy_connection(hid_ishtp_cl, reset);
 	return rv;
 }
 
@@ -738,8 +714,7 @@ static int hid_ishtp_cl_init(struct ishtp_cl *hid_ishtp_cl, int reset)
  */
 static void hid_ishtp_cl_deinit(struct ishtp_cl *hid_ishtp_cl)
 {
-	ishtp_cl_unlink(hid_ishtp_cl);
-	ishtp_cl_flush_queues(hid_ishtp_cl);
+	ishtp_cl_destroy_connection(hid_ishtp_cl, false);
 
 	/* disband and free all Tx and Rx client-level rings */
 	ishtp_cl_free(hid_ishtp_cl);
@@ -749,33 +724,23 @@ static void hid_ishtp_cl_reset_handler(struct work_struct *work)
 {
 	struct ishtp_cl_data *client_data;
 	struct ishtp_cl *hid_ishtp_cl;
-	struct ishtp_cl_device *cl_device;
 	int retry;
 	int rv;
 
 	client_data = container_of(work, struct ishtp_cl_data, work);
 
 	hid_ishtp_cl = client_data->hid_ishtp_cl;
-	cl_device = client_data->cl_device;
 
 	hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
 			hid_ishtp_cl);
 	dev_dbg(ishtp_device(client_data->cl_device), "%s\n", __func__);
 
-	hid_ishtp_cl_deinit(hid_ishtp_cl);
-
-	hid_ishtp_cl = ishtp_cl_allocate(cl_device);
-	if (!hid_ishtp_cl)
-		return;
-
-	ishtp_set_drvdata(cl_device, hid_ishtp_cl);
-	ishtp_set_client_data(hid_ishtp_cl, client_data);
-	client_data->hid_ishtp_cl = hid_ishtp_cl;
+	ishtp_cl_destroy_connection(hid_ishtp_cl, true);
 
 	client_data->num_hid_devices = 0;
 
 	for (retry = 0; retry < 3; ++retry) {
-		rv = hid_ishtp_cl_init(hid_ishtp_cl, 1);
+		rv = hid_ishtp_cl_init(hid_ishtp_cl, true);
 		if (!rv)
 			break;
 		dev_err(cl_data_to_dev(client_data), "Retry reset init\n");
@@ -841,7 +806,7 @@ static int hid_ishtp_cl_probe(struct ishtp_cl_device *cl_device)
 
 	ishtp_hid_print_trace = ishtp_trace_callback(cl_device);
 
-	rv = hid_ishtp_cl_init(hid_ishtp_cl, 0);
+	rv = hid_ishtp_cl_init(hid_ishtp_cl, false);
 	if (rv) {
 		ishtp_cl_free(hid_ishtp_cl);
 		return rv;
@@ -868,11 +833,9 @@ static void hid_ishtp_cl_remove(struct ishtp_cl_device *cl_device)
 			hid_ishtp_cl);
 
 	dev_dbg(ishtp_device(cl_device), "%s\n", __func__);
-	ishtp_set_connection_state(hid_ishtp_cl, ISHTP_CL_DISCONNECTING);
-	ishtp_cl_disconnect(hid_ishtp_cl);
+	hid_ishtp_cl_deinit(hid_ishtp_cl);
 	ishtp_put_device(cl_device);
 	ishtp_hid_remove(client_data);
-	hid_ishtp_cl_deinit(hid_ishtp_cl);
 
 	hid_ishtp_cl = NULL;
 

drivers/hid/intel-ish-hid/ishtp/bus.c

@@ -378,7 +378,7 @@ static const struct dev_pm_ops ishtp_cl_bus_dev_pm_ops = {
 	.restore = ishtp_cl_device_resume,
 };
 
-static struct bus_type ishtp_cl_bus_type = {
+static const struct bus_type ishtp_cl_bus_type = {
 	.name		= "ishtp",
 	.dev_groups	= ishtp_cl_dev_groups,
 	.probe		= ishtp_cl_device_probe,

drivers/hid/intel-ish-hid/ishtp/client.c

@@ -339,16 +339,17 @@ static bool ishtp_cl_is_other_connecting(struct ishtp_cl *cl)
 }
 
 /**
- * ishtp_cl_connect() - Send connect request to firmware
+ * ishtp_cl_connect_to_fw() - Send connect request to firmware
  * @cl: client device instance
  *
- * Send a connect request for a client to firmware. If successful it will
- * RX and TX ring buffers
+ * Send a connect request to the firmware and wait for firmware response.
+ * If there is successful connection response from the firmware, change
+ * client state to ISHTP_CL_CONNECTED, and bind client to related
+ * firmware client_id.
  *
- * Return: 0 if successful connect response from the firmware and able
- * to bind and allocate ring buffers or error code on failure
+ * Return: 0 for success and error code on failure
  */
-int ishtp_cl_connect(struct ishtp_cl *cl)
+static int ishtp_cl_connect_to_fw(struct ishtp_cl *cl)
 {
 	struct ishtp_device *dev;
 	int rets;
@@ -358,8 +359,6 @@ int ishtp_cl_connect(struct ishtp_cl *cl)
 
 	dev = cl->dev;
 
-	dev->print_log(dev, "%s() current_state = %d\n", __func__, cl->state);
-
 	if (ishtp_cl_is_other_connecting(cl)) {
 		dev->print_log(dev, "%s() Busy\n", __func__);
 		return	-EBUSY;
@@ -405,6 +404,38 @@ int ishtp_cl_connect(struct ishtp_cl *cl)
 		return rets;
 	}
 
+	return rets;
+}
+
+/**
+ * ishtp_cl_connect() - Build connection with firmware
+ * @cl: client device instance
+ *
+ * Call ishtp_cl_connect_to_fw() to connect and bind to firmware. If successful,
+ * allocate RX and TX ring buffers, and start flow control with firmware to
+ * start communication.
+ *
+ * Return: 0 if there is successful connection to the firmware, allocate
+ * ring buffers.
+ */
+int ishtp_cl_connect(struct ishtp_cl *cl)
+{
+	struct ishtp_device *dev;
+	int rets;
+
+	if (!cl || !cl->dev)
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	dev->print_log(dev, "%s() current_state = %d\n", __func__, cl->state);
+
+	rets = ishtp_cl_connect_to_fw(cl);
+	if (rets) {
+		dev->print_log(dev, "%s() Connect to fw failed\n", __func__);
+		return rets;
+	}
+
 	rets = ishtp_cl_alloc_rx_ring(cl);
 	if (rets) {
 		dev->print_log(dev, "%s() Alloc RX ring failed\n", __func__);
@@ -422,15 +453,147 @@ int ishtp_cl_connect(struct ishtp_cl *cl)
 		return rets;
 	}
 
-	/* Upon successful connection and allocation, emit flow-control */
+	/*
+	 * Upon successful connection and allocation, start flow-control.
+	 */
 	rets = ishtp_cl_read_start(cl);
 
-	dev->print_log(dev, "%s() successful\n", __func__);
-
 	return rets;
 }
 EXPORT_SYMBOL(ishtp_cl_connect);
 
+/**
+ * ishtp_cl_establish_connection() - Establish connection with the firmware
+ * @cl: client device instance
+ * @uuid: uuid of the client to search
+ * @tx_size: TX ring buffer size
+ * @rx_size: RX ring buffer size
+ * @reset: true if called for reset connection, otherwise for first connection
+ *
+ * This is a helper function for client driver to build connection with firmware.
+ * If it's first time connecting to the firmware, set reset to false, this
+ * function will link client to bus, find client id and send connect request to
+ * the firmware.
+ *
+ * If it's called for reset handler where client lost connection after
+ * firmware reset, set reset to true, this function will reinit client state and
+ * establish connection again. In this case, this function reuses current client
+ * structure and ring buffers to avoid allocation failure and memory fragments.
+ *
+ * Return: 0 for successful connection with the firmware,
+ * or error code on failure
+ */
+int ishtp_cl_establish_connection(struct ishtp_cl *cl, const guid_t *uuid,
+				  int tx_size, int rx_size, bool reset)
+{
+	struct ishtp_device *dev;
+	struct ishtp_fw_client *fw_client;
+	int rets;
+
+	if (!cl || !cl->dev)
+		return -ENODEV;
+
+	dev = cl->dev;
+
+	ishtp_set_connection_state(cl, ISHTP_CL_INITIALIZING);
+
+	/* reinit ishtp_cl structure if call for reset */
+	if (reset) {
+		cl->host_client_id = 0;
+		cl->fw_client_id = 0;
+		cl->ishtp_flow_ctrl_creds = 0;
+		cl->out_flow_ctrl_creds = 0;
+
+		cl->last_tx_path = CL_TX_PATH_IPC;
+		cl->last_dma_acked = 1;
+		cl->last_dma_addr = NULL;
+		cl->last_ipc_acked = 1;
+
+		cl->sending = 0;
+		cl->err_send_msg = 0;
+		cl->err_send_fc = 0;
+
+		cl->send_msg_cnt_ipc = 0;
+		cl->send_msg_cnt_dma = 0;
+		cl->recv_msg_cnt_ipc = 0;
+		cl->recv_msg_cnt_dma = 0;
+		cl->recv_msg_num_frags = 0;
+		cl->ishtp_flow_ctrl_cnt = 0;
+		cl->out_flow_ctrl_cnt = 0;
+	}
+
+	/* link to bus */
+	rets = ishtp_cl_link(cl);
+	if (rets) {
+		dev->print_log(dev, "%s() ishtp_cl_link failed\n", __func__);
+		return rets;
+	}
+
+	/* find firmware client */
+	fw_client = ishtp_fw_cl_get_client(dev, uuid);
+	if (!fw_client) {
+		dev->print_log(dev,
+			       "%s() ish client uuid not found\n", __func__);
+		return -ENOENT;
+	}
+
+	ishtp_set_tx_ring_size(cl, tx_size);
+	ishtp_set_rx_ring_size(cl, rx_size);
+
+	ishtp_cl_set_fw_client_id(cl, ishtp_get_fw_client_id(fw_client));
+
+	ishtp_set_connection_state(cl, ISHTP_CL_CONNECTING);
+
+	/*
+	 * For reset case, not allocate tx/rx ring buffer which are already
+	 * done in ishtp_cl_connect() during first connection.
+	 */
+	if (reset) {
+		rets = ishtp_cl_connect_to_fw(cl);
+		if (!rets)
+			rets = ishtp_cl_read_start(cl);
+		else
+			dev->print_log(dev,
+				"%s() connect to fw failed\n", __func__);
+	} else {
+		rets = ishtp_cl_connect(cl);
+	}
+
+	return rets;
+}
+EXPORT_SYMBOL(ishtp_cl_establish_connection);
+
+/**
+ * ishtp_cl_destroy_connection() - Disconnect with the firmware
+ * @cl: client device instance
+ * @reset: true if called for firmware reset, false for normal disconnection
+ *
+ * This is a helper function for client driver to disconnect with firmware,
+ * unlink to bus and flush message queue.
+ */
+void ishtp_cl_destroy_connection(struct ishtp_cl *cl, bool reset)
+{
+	if (!cl)
+		return;
+
+	if (reset) {
+		/*
+		 * For reset case, connection is already lost during fw reset.
+		 * Just set state to DISCONNECTED is enough.
+		 */
+		ishtp_set_connection_state(cl, ISHTP_CL_DISCONNECTED);
+	} else {
+		if (cl->state != ISHTP_CL_DISCONNECTED) {
+			ishtp_set_connection_state(cl, ISHTP_CL_DISCONNECTING);
+			ishtp_cl_disconnect(cl);
+		}
+	}
+
+	ishtp_cl_unlink(cl);
+	ishtp_cl_flush_queues(cl);
+}
+EXPORT_SYMBOL(ishtp_cl_destroy_connection);
+
 /**
  * ishtp_cl_read_start() - Prepare to read client message
  * @cl: client device instance

drivers/hid/wacom.h

@@ -164,6 +164,7 @@ struct wacom {
 	struct work_struct battery_work;
 	struct work_struct remote_work;
 	struct delayed_work init_work;
+	struct delayed_work aes_battery_work;
 	struct wacom_remote *remote;
 	struct work_struct mode_change_work;
 	struct timer_list idleprox_timer;

drivers/hid/wacom_sys.c

@@ -1813,6 +1813,13 @@ static void wacom_destroy_battery(struct wacom *wacom)
 	}
 }
 
+static void wacom_aes_battery_handler(struct work_struct *work)
+{
+	struct wacom *wacom = container_of(work, struct wacom, aes_battery_work.work);
+
+	wacom_destroy_battery(wacom);
+}
+
 static ssize_t wacom_show_speed(struct device *dev,
 				struct device_attribute
 				*attr, char *buf)
@@ -2794,6 +2801,7 @@ static int wacom_probe(struct hid_device *hdev,
 
 	mutex_init(&wacom->lock);
 	INIT_DELAYED_WORK(&wacom->init_work, wacom_init_work);
+	INIT_DELAYED_WORK(&wacom->aes_battery_work, wacom_aes_battery_handler);
 	INIT_WORK(&wacom->wireless_work, wacom_wireless_work);
 	INIT_WORK(&wacom->battery_work, wacom_battery_work);
 	INIT_WORK(&wacom->remote_work, wacom_remote_work);

drivers/hid/wacom_wac.c

@@ -2528,11 +2528,12 @@ static void wacom_wac_pen_report(struct hid_device *hdev,
 	struct input_dev *input = wacom_wac->pen_input;
 	bool range = wacom_wac->hid_data.inrange_state;
 	bool sense = wacom_wac->hid_data.sense_state;
+	bool entering_range = !wacom_wac->tool[0] && range;
 
 	if (wacom_wac->is_invalid_bt_frame)
 		return;
 
-	if (!wacom_wac->tool[0] && range) { /* first in range */
+	if (entering_range) { /* first in range */
 		/* Going into range select tool */
 		if (wacom_wac->hid_data.invert_state)
 			wacom_wac->tool[0] = BTN_TOOL_RUBBER;
@@ -2583,6 +2584,15 @@ static void wacom_wac_pen_report(struct hid_device *hdev,
 		input_sync(input);
 	}
 
+	/* Handle AES battery timeout behavior */
+	if (wacom_wac->features.quirks & WACOM_QUIRK_AESPEN) {
+		if (entering_range)
+			cancel_delayed_work(&wacom->aes_battery_work);
+		if (!sense)
+			schedule_delayed_work(&wacom->aes_battery_work,
+					      msecs_to_jiffies(WACOM_AES_BATTERY_TIMEOUT));
+	}
+
 	if (!sense) {
 		wacom_wac->tool[0] = 0;
 		wacom_wac->id[0] = 0;
@@ -2649,8 +2659,8 @@ static void wacom_wac_finger_slot(struct wacom_wac *wacom_wac,
 {
 	struct hid_data *hid_data = &wacom_wac->hid_data;
 	bool mt = wacom_wac->features.touch_max > 1;
-	bool prox = hid_data->tipswitch &&
-		    report_touch_events(wacom_wac);
+	bool touch_down = hid_data->tipswitch && hid_data->confidence;
+	bool prox = touch_down && report_touch_events(wacom_wac);
 
 	if (touch_is_muted(wacom_wac)) {
 		if (!wacom_wac->shared->touch_down)
@@ -2700,24 +2710,6 @@ static void wacom_wac_finger_slot(struct wacom_wac *wacom_wac,
 	}
 }
 
-static bool wacom_wac_slot_is_active(struct input_dev *dev, int key)
-{
-	struct input_mt *mt = dev->mt;
-	struct input_mt_slot *s;
-
-	if (!mt)
-		return false;
-
-	for (s = mt->slots; s != mt->slots + mt->num_slots; s++) {
-		if (s->key == key &&
-			input_mt_get_value(s, ABS_MT_TRACKING_ID) >= 0) {
-			return true;
-		}
-	}
-
-	return false;
-}
-
 static void wacom_wac_finger_event(struct hid_device *hdev,
 		struct hid_field *field, struct hid_usage *usage, __s32 value)
 {
@@ -2768,15 +2760,9 @@ static void wacom_wac_finger_event(struct hid_device *hdev,
 	}
 
 	if (usage->usage_index + 1 == field->report_count) {
-		if (equivalent_usage == wacom_wac->hid_data.last_slot_field) {
-			bool touch_removed = wacom_wac_slot_is_active(wacom_wac->touch_input,
-				wacom_wac->hid_data.id) && !wacom_wac->hid_data.tipswitch;
-
-			if (wacom_wac->hid_data.confidence || touch_removed) {
+		if (equivalent_usage == wacom_wac->hid_data.last_slot_field)
 			wacom_wac_finger_slot(wacom_wac, wacom_wac->touch_input);
 	}
-		}
-	}
 }
 
 static void wacom_wac_finger_pre_report(struct hid_device *hdev,

drivers/hid/wacom_wac.h

@@ -14,6 +14,7 @@
 #define WACOM_MAX_REMOTES	5
 #define WACOM_STATUS_UNKNOWN	255
 #define WACOM_REMOTE_BATTERY_TIMEOUT	21000000000ll
+#define WACOM_AES_BATTERY_TIMEOUT       1800000
 
 /* packet length for individual models */
 #define WACOM_PKGLEN_BBFUN	 9

drivers/platform/chrome/cros_ec_ishtp.c

@@ -367,55 +367,33 @@ static void ish_event_cb(struct ishtp_cl_device *cl_device)
 /**
  * cros_ish_init() - Init function for ISHTP client
  * @cros_ish_cl: ISHTP client instance
+ * @reset: true if called from reset handler
  *
  * This function complete the initializtion of the client.
  *
  * Return: 0 for success, negative error code for failure.
  */
-static int cros_ish_init(struct ishtp_cl *cros_ish_cl)
+static int cros_ish_init(struct ishtp_cl *cros_ish_cl, bool reset)
 {
 	int rv;
-	struct ishtp_device *dev;
-	struct ishtp_fw_client *fw_client;
 	struct ishtp_cl_data *client_data = ishtp_get_client_data(cros_ish_cl);
 
-	rv = ishtp_cl_link(cros_ish_cl);
-	if (rv) {
-		dev_err(cl_data_to_dev(client_data),
-			"ishtp_cl_link failed\n");
-		return rv;
-	}
-
-	dev = ishtp_get_ishtp_device(cros_ish_cl);
-
-	/* Connect to firmware client */
-	ishtp_set_tx_ring_size(cros_ish_cl, CROS_ISH_CL_TX_RING_SIZE);
-	ishtp_set_rx_ring_size(cros_ish_cl, CROS_ISH_CL_RX_RING_SIZE);
-
-	fw_client = ishtp_fw_cl_get_client(dev, &cros_ec_ishtp_id_table[0].guid);
-	if (!fw_client) {
-		dev_err(cl_data_to_dev(client_data),
-			"ish client uuid not found\n");
-		rv = -ENOENT;
-		goto err_cl_unlink;
-	}
-
-	ishtp_cl_set_fw_client_id(cros_ish_cl,
-				  ishtp_get_fw_client_id(fw_client));
-	ishtp_set_connection_state(cros_ish_cl, ISHTP_CL_CONNECTING);
-
-	rv = ishtp_cl_connect(cros_ish_cl);
+	rv = ishtp_cl_establish_connection(cros_ish_cl,
+					   &cros_ec_ishtp_id_table[0].guid,
+					   CROS_ISH_CL_TX_RING_SIZE,
+					   CROS_ISH_CL_RX_RING_SIZE,
+					   reset);
 	if (rv) {
 		dev_err(cl_data_to_dev(client_data),
 			"client connect fail\n");
-		goto err_cl_unlink;
+		goto err_cl_disconnect;
 	}
 
 	ishtp_register_event_cb(client_data->cl_device, ish_event_cb);
 	return 0;
 
-err_cl_unlink:
-	ishtp_cl_unlink(cros_ish_cl);
+err_cl_disconnect:
+	ishtp_cl_destroy_connection(cros_ish_cl, reset);
 	return rv;
 }
 
@@ -427,10 +405,7 @@ static int cros_ish_init(struct ishtp_cl *cros_ish_cl)
  */
 static void cros_ish_deinit(struct ishtp_cl *cros_ish_cl)
 {
-	ishtp_set_connection_state(cros_ish_cl, ISHTP_CL_DISCONNECTING);
-	ishtp_cl_disconnect(cros_ish_cl);
-	ishtp_cl_unlink(cros_ish_cl);
-	ishtp_cl_flush_queues(cros_ish_cl);
+	ishtp_cl_destroy_connection(cros_ish_cl, false);
 
 	/* Disband and free all Tx and Rx client-level rings */
 	ishtp_cl_free(cros_ish_cl);
@@ -592,7 +567,6 @@ static void reset_handler(struct work_struct *work)
 	int rv;
 	struct device *dev;
 	struct ishtp_cl *cros_ish_cl;
-	struct ishtp_cl_device *cl_device;
 	struct ishtp_cl_data *client_data =
 		container_of(work, struct ishtp_cl_data, work_ishtp_reset);
 
@@ -600,26 +574,11 @@ static void reset_handler(struct work_struct *work)
 	down_write(&init_lock);
 
 	cros_ish_cl = client_data->cros_ish_cl;
-	cl_device = client_data->cl_device;
 
-	/* Unlink, flush queues & start again */
-	ishtp_cl_unlink(cros_ish_cl);
-	ishtp_cl_flush_queues(cros_ish_cl);
-	ishtp_cl_free(cros_ish_cl);
-
-	cros_ish_cl = ishtp_cl_allocate(cl_device);
-	if (!cros_ish_cl) {
-		up_write(&init_lock);
-		return;
-	}
-
-	ishtp_set_drvdata(cl_device, cros_ish_cl);
-	ishtp_set_client_data(cros_ish_cl, client_data);
-	client_data->cros_ish_cl = cros_ish_cl;
+	ishtp_cl_destroy_connection(cros_ish_cl, true);
 
-	rv = cros_ish_init(cros_ish_cl);
+	rv = cros_ish_init(cros_ish_cl, true);
 	if (rv) {
-		ishtp_cl_free(cros_ish_cl);
 		dev_err(cl_data_to_dev(client_data), "Reset Failed\n");
 		up_write(&init_lock);
 		return;
@@ -672,7 +631,7 @@ static int cros_ec_ishtp_probe(struct ishtp_cl_device *cl_device)
 	INIT_WORK(&client_data->work_ec_evt,
 		  ish_evt_handler);
 
-	rv = cros_ish_init(cros_ish_cl);
+	rv = cros_ish_init(cros_ish_cl, false);
 	if (rv)
 		goto end_ishtp_cl_init_error;
 
@@ -690,10 +649,7 @@ static int cros_ec_ishtp_probe(struct ishtp_cl_device *cl_device)
 	return 0;
 
 end_cros_ec_dev_init_error:
-	ishtp_set_connection_state(cros_ish_cl, ISHTP_CL_DISCONNECTING);
-	ishtp_cl_disconnect(cros_ish_cl);
-	ishtp_cl_unlink(cros_ish_cl);
-	ishtp_cl_flush_queues(cros_ish_cl);
+	ishtp_cl_destroy_connection(cros_ish_cl, false);
 	ishtp_put_device(cl_device);
 end_ishtp_cl_init_error:
 	ishtp_cl_free(cros_ish_cl);

include/linux/amd-pmf-io.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * AMD Platform Management Framework Interface
+ *
+ * Copyright (c) 2023, Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Authors: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
+ *          Basavaraj Natikar <Basavaraj.Natikar@amd.com>
+ */
+
+#ifndef AMD_PMF_IO_H
+#define AMD_PMF_IO_H
+
+#include <linux/types.h>
+
+/**
+ * enum sfh_message_type - Query the SFH message type
+ * @MT_HPD: Message ID to know the Human presence info from MP2 FW
+ * @MT_ALS: Message ID to know the Ambient light info from MP2 FW
+ */
+enum sfh_message_type {
+	MT_HPD,
+	MT_ALS,
+};
+
+/**
+ * enum sfh_hpd_info - Query the Human presence information
+ * @SFH_NOT_DETECTED: Check the HPD connection information from MP2 FW
+ * @SFH_USER_PRESENT: Check if the user is present from HPD sensor
+ * @SFH_USER_AWAY: Check if the user is away from HPD sensor
+ */
+enum sfh_hpd_info {
+	SFH_NOT_DETECTED,
+	SFH_USER_PRESENT,
+	SFH_USER_AWAY,
+};
+
+/**
+ * struct amd_sfh_info - get HPD sensor info from MP2 FW
+ * @ambient_light: Populates the ambient light information
+ * @user_present: Populates the user presence information
+ */
+struct amd_sfh_info {
+	u32 ambient_light;
+	u8 user_present;
+};
+
+int amd_get_sfh_info(struct amd_sfh_info *sfh_info, enum sfh_message_type op);
+#endif

include/linux/hid.h

@@ -912,7 +912,7 @@ extern bool hid_ignore(struct hid_device *);
 extern int hid_add_device(struct hid_device *);
 extern void hid_destroy_device(struct hid_device *);
 
-extern struct bus_type hid_bus_type;
+extern const struct bus_type hid_bus_type;
 
 extern int __must_check __hid_register_driver(struct hid_driver *,
 		struct module *, const char *mod_name);

include/linux/hid_bpf.h

@@ -115,7 +115,7 @@ struct hid_bpf_ops {
 				  size_t len, enum hid_report_type rtype,
 				  enum hid_class_request reqtype);
 	struct module *owner;
-	struct bus_type *bus_type;
+	const struct bus_type *bus_type;
 };
 
 extern struct hid_bpf_ops *hid_bpf_ops;

include/linux/intel-ish-client-if.h

@@ -94,6 +94,9 @@ int ishtp_cl_link(struct ishtp_cl *cl);
 void ishtp_cl_unlink(struct ishtp_cl *cl);
 int ishtp_cl_disconnect(struct ishtp_cl *cl);
 int ishtp_cl_connect(struct ishtp_cl *cl);
+int ishtp_cl_establish_connection(struct ishtp_cl *cl, const guid_t *uuid,
+				  int tx_size, int rx_size, bool reset);
+void ishtp_cl_destroy_connection(struct ishtp_cl *cl, bool reset);
 int ishtp_cl_send(struct ishtp_cl *cl, uint8_t *buf, size_t length);
 int ishtp_cl_flush_queues(struct ishtp_cl *cl);
 int ishtp_cl_io_rb_recycle(struct ishtp_cl_rb *rb);

tools/testing/selftests/hid/tests/base.py

@@ -14,7 +14,7 @@ import logging
 
 from hidtools.device.base_device import BaseDevice, EvdevMatch, SysfsFile
 from pathlib import Path
-from typing import Final
+from typing import Final, List, Tuple
 
 logger = logging.getLogger("hidtools.test.base")
 
@@ -155,7 +155,7 @@ class BaseTestCase:
         # if any module is not available (not compiled), the test will skip.
         # Each element is a tuple '(kernel driver name, kernel module)',
         # for example ("playstation", "hid-playstation")
-        kernel_modules = []
+        kernel_modules: List[Tuple[str, str]] = []
 
         def assertInputEventsIn(self, expected_events, effective_events):
             effective_events = effective_events.copy()
@@ -238,8 +238,7 @@ class BaseTestCase:
             try:
                 with HIDTestUdevRule.instance():
                     with new_uhdev as self.uhdev:
-                        skip_cond = request.node.get_closest_marker("skip_if_uhdev")
-                        if skip_cond:
+                        for skip_cond in request.node.iter_markers("skip_if_uhdev"):
                             test, message, *rest = skip_cond.args
 
                             if test(self.uhdev):

tools/testing/selftests/hid/tests/test_mouse.py

@@ -52,13 +52,13 @@ class BaseMouse(base.UHIDTestDevice):
         :param reportID: the numeric report ID for this report, if needed
         """
         if buttons is not None:
-            l, r, m = buttons
-            if l is not None:
-                self.left = l
-            if r is not None:
-                self.right = r
-            if m is not None:
-                self.middle = m
+            left, right, middle = buttons
+            if left is not None:
+                self.left = left
+            if right is not None:
+                self.right = right
+            if middle is not None:
+                self.middle = middle
         left = self.left
         right = self.right
         middle = self.middle

tools/testing/selftests/hid/vmtest.sh

@@ -19,12 +19,12 @@ esac
 SCRIPT_DIR="$(dirname $(realpath $0))"
 OUTPUT_DIR="$SCRIPT_DIR/results"
 KCONFIG_REL_PATHS=("${SCRIPT_DIR}/config" "${SCRIPT_DIR}/config.common" "${SCRIPT_DIR}/config.${ARCH}")
-B2C_URL="https://gitlab.freedesktop.org/mupuf/boot2container/-/raw/master/vm2c.py"
+B2C_URL="https://gitlab.freedesktop.org/gfx-ci/boot2container/-/raw/main/vm2c.py"
 NUM_COMPILE_JOBS="$(nproc)"
 LOG_FILE_BASE="$(date +"hid_selftests.%Y-%m-%d_%H-%M-%S")"
 LOG_FILE="${LOG_FILE_BASE}.log"
 EXIT_STATUS_FILE="${LOG_FILE_BASE}.exit_status"
-CONTAINER_IMAGE="registry.freedesktop.org/libevdev/hid-tools/fedora/37:2023-02-17.1"
+CONTAINER_IMAGE="registry.freedesktop.org/bentiss/hid/fedora/39:2023-11-22.1"
 
 TARGETS="${TARGETS:=$(basename ${SCRIPT_DIR})}"
 DEFAULT_COMMAND="pip3 install hid-tools; make -C tools/testing/selftests TARGETS=${TARGETS} run_tests"
@@ -32,7 +32,7 @@ DEFAULT_COMMAND="pip3 install hid-tools; make -C tools/testing/selftests TARGETS
 usage()
 {
 	cat <<EOF
-Usage: $0 [-i] [-s] [-d <output_dir>] -- [<command>]
+Usage: $0 [-j N] [-s] [-b] [-d <output_dir>] -- [<command>]
 
 <command> is the command you would normally run when you are in
 the source kernel direcory. e.g:
@@ -55,6 +55,7 @@ Options:
 
 	-u)		Update the boot2container script to a newer version.
 	-d)		Update the output directory (default: ${OUTPUT_DIR})
+	-b)		Run only the build steps for the kernel and the selftests
 	-j)		Number of jobs for compilation, similar to -j in make
 			(default: ${NUM_COMPILE_JOBS})
 	-s)		Instead of powering off the VM, start an interactive
@@ -191,8 +192,9 @@ main()
 	local command="${DEFAULT_COMMAND}"
 	local update_b2c="no"
 	local debug_shell="no"
+	local build_only="no"
 
-	while getopts ':hsud:j:' opt; do
+	while getopts ':hsud:j:b' opt; do
 		case ${opt} in
 		u)
 			update_b2c="yes"
@@ -207,6 +209,9 @@ main()
 			command="/bin/sh"
 			debug_shell="yes"
 			;;
+		b)
+			build_only="yes"
+			;;
 		h)
 			usage
 			exit 0
@@ -226,8 +231,7 @@ main()
 	shift $((OPTIND -1))
 
 	# trap 'catch "$?"' EXIT
-
-	if [[ "${debug_shell}" == "no" ]]; then
+	if [[ "${build_only}" == "no" && "${debug_shell}" == "no" ]]; then
 		if [[ $# -eq 0 ]]; then
 			echo "No command specified, will run ${DEFAULT_COMMAND} in the vm"
 		else
@@ -267,7 +271,9 @@ main()
 	update_kconfig "${kernel_checkout}" "${kconfig_file}"
 
 	recompile_kernel "${kernel_checkout}" "${make_command}"
+	update_selftests "${kernel_checkout}" "${make_command}"
 
+	if [[ "${build_only}" == "no" ]]; then
 		if [[ "${update_b2c}" == "no" && ! -f "${b2c}" ]]; then
 			echo "vm2c script not found in ${b2c}"
 			update_b2c="yes"
@@ -278,13 +284,13 @@ main()
 			chmod +x $b2c
 		fi
 
-	update_selftests "${kernel_checkout}" "${make_command}"
 		run_vm "${kernel_checkout}" $b2c "${kernel_bzimage}" "${command}"
 		if [[ "${debug_shell}" != "yes" ]]; then
 			echo "Logs saved in ${OUTPUT_DIR}/${LOG_FILE}"
 		fi
 
 		exit $(cat ${OUTPUT_DIR}/${EXIT_STATUS_FILE})
+	fi
 }
 
 main "$@"