Commit 53431d0a authored by Dmitry Torokhov's avatar Dmitry Torokhov

Merge branch 'next' into for-linus

Prepare second round of input updates for 4.3 merge window.
parents 01b944fe ade9c1a4
* Toradex Colibri VF50 Touchscreen driver
Required Properties:
- compatible must be toradex,vf50-touchscreen
- io-channels: adc channels being used by the Colibri VF50 module
- xp-gpios: FET gate driver for input of X+
- xm-gpios: FET gate driver for input of X-
- yp-gpios: FET gate driver for input of Y+
- ym-gpios: FET gate driver for input of Y-
- interrupt-parent: phandle for the interrupt controller
- interrupts: pen irq interrupt for touch detection
- pinctrl-names: "idle", "default", "gpios"
- pinctrl-0: pinctrl node for pen/touch detection state pinmux
- pinctrl-1: pinctrl node for X/Y and pressure measurement (ADC) state pinmux
- pinctrl-2: pinctrl node for gpios functioning as FET gate drivers
- vf50-ts-min-pressure: pressure level at which to stop measuring X/Y values
Example:
touchctrl: vf50_touchctrl {
compatible = "toradex,vf50-touchscreen";
io-channels = <&adc1 0>,<&adc0 0>,
<&adc0 1>,<&adc1 2>;
xp-gpios = <&gpio0 13 GPIO_ACTIVE_LOW>;
xm-gpios = <&gpio2 29 GPIO_ACTIVE_HIGH>;
yp-gpios = <&gpio0 12 GPIO_ACTIVE_LOW>;
ym-gpios = <&gpio0 4 GPIO_ACTIVE_HIGH>;
interrupt-parent = <&gpio0>;
interrupts = <8 IRQ_TYPE_LEVEL_LOW>;
pinctrl-names = "idle","default","gpios";
pinctrl-0 = <&pinctrl_touchctrl_idle>;
pinctrl-1 = <&pinctrl_touchctrl_default>;
pinctrl-2 = <&pinctrl_touchctrl_gpios>;
vf50-ts-min-pressure = <200>;
status = "disabled";
};
* Freescale i.MX6UL Touch Controller
Required properties:
- compatible: must be "fsl,imx6ul-tsc".
- reg: this touch controller address and the ADC2 address.
- interrupts: the interrupt of this touch controller and ADC2.
- clocks: the root clock of touch controller and ADC2.
- clock-names; must be "tsc" and "adc".
- xnur-gpio: the X- gpio this controller connect to.
This xnur-gpio returns to low once the finger leave the touch screen (The
last touch event the touch controller capture).
Optional properties:
- measure-delay-time: the value of measure delay time.
Before X-axis or Y-axis measurement, the screen need some time before
even potential distribution ready.
This value depends on the touch screen.
- pre-charge-time: the touch screen need some time to precharge.
This value depends on the touch screen.
Example:
tsc: tsc@02040000 {
compatible = "fsl,imx6ul-tsc";
reg = <0x02040000 0x4000>, <0x0219c000 0x4000>;
interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clks IMX6UL_CLK_IPG>,
<&clks IMX6UL_CLK_ADC2>;
clock-names = "tsc", "adc";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_tsc>;
xnur-gpio = <&gpio1 3 GPIO_ACTIVE_LOW>;
measure-delay-time = <0xfff>;
pre-charge-time = <0xffff>;
status = "okay";
};
......@@ -290,19 +290,14 @@ static int evdev_flush(struct file *file, fl_owner_t id)
{
struct evdev_client *client = file->private_data;
struct evdev *evdev = client->evdev;
int retval;
retval = mutex_lock_interruptible(&evdev->mutex);
if (retval)
return retval;
mutex_lock(&evdev->mutex);
if (!evdev->exist || client->revoked)
retval = -ENODEV;
else
retval = input_flush_device(&evdev->handle, file);
if (evdev->exist && !client->revoked)
input_flush_device(&evdev->handle, file);
mutex_unlock(&evdev->mutex);
return retval;
return 0;
}
static void evdev_free(struct device *dev)
......
......@@ -5,8 +5,6 @@
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* <<Power management needs to be implemented>>.
*/
#include <linux/clk.h>
......
......@@ -118,6 +118,7 @@ static const struct of_device_id ab8500_ponkey_match[] = {
{ .compatible = "stericsson,ab8500-ponkey", },
{}
};
MODULE_DEVICE_TABLE(of, ab8500_ponkey_match);
#endif
static struct platform_driver ab8500_ponkey_driver = {
......
......@@ -173,6 +173,7 @@ static const struct of_device_id pwm_beeper_match[] = {
{ .compatible = "pwm-beeper", },
{ },
};
MODULE_DEVICE_TABLE(of, pwm_beeper_match);
#endif
static struct platform_driver pwm_beeper_driver = {
......
......@@ -249,6 +249,7 @@ static const struct of_device_id regulator_haptic_dt_match[] = {
{ .compatible = "regulator-haptic" },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, regulator_haptic_dt_match);
static struct platform_driver regulator_haptic_driver = {
.probe = regulator_haptic_probe,
......
......@@ -253,6 +253,7 @@ static const struct of_device_id bbc_beep_match[] = {
},
{},
};
MODULE_DEVICE_TABLE(of, bbc_beep_match);
static struct platform_driver bbc_beep_driver = {
.driver = {
......@@ -332,6 +333,7 @@ static const struct of_device_id grover_beep_match[] = {
},
{},
};
MODULE_DEVICE_TABLE(of, grover_beep_match);
static struct platform_driver grover_beep_driver = {
.driver = {
......
......@@ -1170,6 +1170,7 @@ static const struct acpi_device_id elan_acpi_id[] = {
{ "ELAN0000", 0 },
{ "ELAN0100", 0 },
{ "ELAN0600", 0 },
{ "ELAN1000", 0 },
{ }
};
MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
......
......@@ -877,7 +877,7 @@ static int __init i8042_check_aux(void)
static int i8042_controller_check(void)
{
if (i8042_flush()) {
pr_err("No controller found\n");
pr_info("No controller found\n");
return -ENODEV;
}
......
......@@ -479,6 +479,18 @@ config TOUCHSCREEN_MTOUCH
To compile this driver as a module, choose M here: the
module will be called mtouch.
config TOUCHSCREEN_IMX6UL_TSC
tristate "Freescale i.MX6UL touchscreen controller"
depends on (OF && GPIOLIB) || COMPILE_TEST
help
Say Y here if you have a Freescale i.MX6UL, and want to
use the internal touchscreen controller.
If unsure, say N.
To compile this driver as a module, choose M here: the
module will be called imx6ul_tsc.
config TOUCHSCREEN_INEXIO
tristate "iNexio serial touchscreens"
select SERIO
......@@ -1040,4 +1052,16 @@ config TOUCHSCREEN_ZFORCE
To compile this driver as a module, choose M here: the
module will be called zforce_ts.
config TOUCHSCREEN_COLIBRI_VF50
tristate "Toradex Colibri on board touchscreen driver"
depends on GPIOLIB && IIO && VF610_ADC
help
Say Y here if you have a Colibri VF50 and plan to use
the on-board provided 4-wire touchscreen driver.
If unsure, say N.
To compile this driver as a module, choose M here: the
module will be called colibri_vf50_ts.
endif
......@@ -38,6 +38,7 @@ obj-$(CONFIG_TOUCHSCREEN_EGALAX) += egalax_ts.o
obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
obj-$(CONFIG_TOUCHSCREEN_GOODIX) += goodix.o
obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o
obj-$(CONFIG_TOUCHSCREEN_IMX6UL_TSC) += imx6ul_tsc.o
obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o
obj-$(CONFIG_TOUCHSCREEN_INTEL_MID) += intel-mid-touch.o
obj-$(CONFIG_TOUCHSCREEN_IPROC) += bcm_iproc_tsc.o
......@@ -85,3 +86,4 @@ obj-$(CONFIG_TOUCHSCREEN_W90X900) += w90p910_ts.o
obj-$(CONFIG_TOUCHSCREEN_SX8654) += sx8654.o
obj-$(CONFIG_TOUCHSCREEN_TPS6507X) += tps6507x-ts.o
obj-$(CONFIG_TOUCHSCREEN_ZFORCE) += zforce_ts.o
obj-$(CONFIG_TOUCHSCREEN_COLIBRI_VF50) += colibri-vf50-ts.o
/*
* Toradex Colibri VF50 Touchscreen driver
*
* Copyright 2015 Toradex AG
*
* Originally authored by Stefan Agner for 3.0 kernel
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/iio/consumer.h>
#include <linux/iio/types.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/types.h>
#define DRIVER_NAME "colibri-vf50-ts"
#define DRV_VERSION "1.0"
#define VF_ADC_MAX ((1 << 12) - 1)
#define COLI_TOUCH_MIN_DELAY_US 1000
#define COLI_TOUCH_MAX_DELAY_US 2000
#define COLI_PULLUP_MIN_DELAY_US 10000
#define COLI_PULLUP_MAX_DELAY_US 11000
#define COLI_TOUCH_NO_OF_AVGS 5
#define COLI_TOUCH_REQ_ADC_CHAN 4
struct vf50_touch_device {
struct platform_device *pdev;
struct input_dev *ts_input;
struct iio_channel *channels;
struct gpio_desc *gpio_xp;
struct gpio_desc *gpio_xm;
struct gpio_desc *gpio_yp;
struct gpio_desc *gpio_ym;
int pen_irq;
int min_pressure;
bool stop_touchscreen;
};
/*
* Enables given plates and measures touch parameters using ADC
*/
static int adc_ts_measure(struct iio_channel *channel,
struct gpio_desc *plate_p, struct gpio_desc *plate_m)
{
int i, value = 0, val = 0;
int error;
gpiod_set_value(plate_p, 1);
gpiod_set_value(plate_m, 1);
usleep_range(COLI_TOUCH_MIN_DELAY_US, COLI_TOUCH_MAX_DELAY_US);
for (i = 0; i < COLI_TOUCH_NO_OF_AVGS; i++) {
error = iio_read_channel_raw(channel, &val);
if (error < 0) {
value = error;
goto error_iio_read;
}
value += val;
}
value /= COLI_TOUCH_NO_OF_AVGS;
error_iio_read:
gpiod_set_value(plate_p, 0);
gpiod_set_value(plate_m, 0);
return value;
}
/*
* Enable touch detection using falling edge detection on XM
*/
static void vf50_ts_enable_touch_detection(struct vf50_touch_device *vf50_ts)
{
/* Enable plate YM (needs to be strong GND, high active) */
gpiod_set_value(vf50_ts->gpio_ym, 1);
/*
* Let the platform mux to idle state in order to enable
* Pull-Up on GPIO
*/
pinctrl_pm_select_idle_state(&vf50_ts->pdev->dev);
/* Wait for the pull-up to be stable on high */
usleep_range(COLI_PULLUP_MIN_DELAY_US, COLI_PULLUP_MAX_DELAY_US);
}
/*
* ADC touch screen sampling bottom half irq handler
*/
static irqreturn_t vf50_ts_irq_bh(int irq, void *private)
{
struct vf50_touch_device *vf50_ts = private;
struct device *dev = &vf50_ts->pdev->dev;
int val_x, val_y, val_z1, val_z2, val_p = 0;
bool discard_val_on_start = true;
/* Disable the touch detection plates */
gpiod_set_value(vf50_ts->gpio_ym, 0);
/* Let the platform mux to default state in order to mux as ADC */
pinctrl_pm_select_default_state(dev);
while (!vf50_ts->stop_touchscreen) {
/* X-Direction */
val_x = adc_ts_measure(&vf50_ts->channels[0],
vf50_ts->gpio_xp, vf50_ts->gpio_xm);
if (val_x < 0)
break;
/* Y-Direction */
val_y = adc_ts_measure(&vf50_ts->channels[1],
vf50_ts->gpio_yp, vf50_ts->gpio_ym);
if (val_y < 0)
break;
/*
* Touch pressure
* Measure on XP/YM
*/
val_z1 = adc_ts_measure(&vf50_ts->channels[2],
vf50_ts->gpio_yp, vf50_ts->gpio_xm);
if (val_z1 < 0)
break;
val_z2 = adc_ts_measure(&vf50_ts->channels[3],
vf50_ts->gpio_yp, vf50_ts->gpio_xm);
if (val_z2 < 0)
break;
/* Validate signal (avoid calculation using noise) */
if (val_z1 > 64 && val_x > 64) {
/*
* Calculate resistance between the plates
* lower resistance means higher pressure
*/
int r_x = (1000 * val_x) / VF_ADC_MAX;
val_p = (r_x * val_z2) / val_z1 - r_x;
} else {
val_p = 2000;
}
val_p = 2000 - val_p;
dev_dbg(dev,
"Measured values: x: %d, y: %d, z1: %d, z2: %d, p: %d\n",
val_x, val_y, val_z1, val_z2, val_p);
/*
* If touch pressure is too low, stop measuring and reenable
* touch detection
*/
if (val_p < vf50_ts->min_pressure || val_p > 2000)
break;
/*
* The pressure may not be enough for the first x and the
* second y measurement, but, the pressure is ok when the
* driver is doing the third and fourth measurement. To
* take care of this, we drop the first measurement always.
*/
if (discard_val_on_start) {
discard_val_on_start = false;
} else {
/*
* Report touch position and sleep for
* the next measurement.
*/
input_report_abs(vf50_ts->ts_input,
ABS_X, VF_ADC_MAX - val_x);
input_report_abs(vf50_ts->ts_input,
ABS_Y, VF_ADC_MAX - val_y);
input_report_abs(vf50_ts->ts_input,
ABS_PRESSURE, val_p);
input_report_key(vf50_ts->ts_input, BTN_TOUCH, 1);
input_sync(vf50_ts->ts_input);
}
usleep_range(COLI_PULLUP_MIN_DELAY_US,
COLI_PULLUP_MAX_DELAY_US);
}
/* Report no more touch, re-enable touch detection */
input_report_abs(vf50_ts->ts_input, ABS_PRESSURE, 0);
input_report_key(vf50_ts->ts_input, BTN_TOUCH, 0);
input_sync(vf50_ts->ts_input);
vf50_ts_enable_touch_detection(vf50_ts);
return IRQ_HANDLED;
}
static int vf50_ts_open(struct input_dev *dev_input)
{
struct vf50_touch_device *touchdev = input_get_drvdata(dev_input);
struct device *dev = &touchdev->pdev->dev;
dev_dbg(dev, "Input device %s opened, starting touch detection\n",
dev_input->name);
touchdev->stop_touchscreen = false;
/* Mux detection before request IRQ, wait for pull-up to settle */
vf50_ts_enable_touch_detection(touchdev);
return 0;
}
static void vf50_ts_close(struct input_dev *dev_input)
{
struct vf50_touch_device *touchdev = input_get_drvdata(dev_input);
struct device *dev = &touchdev->pdev->dev;
touchdev->stop_touchscreen = true;
/* Make sure IRQ is not running past close */
mb();
synchronize_irq(touchdev->pen_irq);
gpiod_set_value(touchdev->gpio_ym, 0);
pinctrl_pm_select_default_state(dev);
dev_dbg(dev, "Input device %s closed, disable touch detection\n",
dev_input->name);
}
static int vf50_ts_get_gpiod(struct device *dev, struct gpio_desc **gpio_d,
const char *con_id, enum gpiod_flags flags)
{
int error;
*gpio_d = devm_gpiod_get(dev, con_id, flags);
if (IS_ERR(*gpio_d)) {
error = PTR_ERR(*gpio_d);
dev_err(dev, "Could not get gpio_%s %d\n", con_id, error);
return error;
}
return 0;
}
static void vf50_ts_channel_release(void *data)
{
struct iio_channel *channels = data;
iio_channel_release_all(channels);
}
static int vf50_ts_probe(struct platform_device *pdev)
{
struct input_dev *input;
struct iio_channel *channels;
struct device *dev = &pdev->dev;
struct vf50_touch_device *touchdev;
int num_adc_channels;
int error;
channels = iio_channel_get_all(dev);
if (IS_ERR(channels))
return PTR_ERR(channels);
error = devm_add_action(dev, vf50_ts_channel_release, channels);
if (error) {
iio_channel_release_all(channels);
dev_err(dev, "Failed to register iio channel release action");
return error;
}
num_adc_channels = 0;
while (channels[num_adc_channels].indio_dev)
num_adc_channels++;
if (num_adc_channels != COLI_TOUCH_REQ_ADC_CHAN) {
dev_err(dev, "Inadequate ADC channels specified\n");
return -EINVAL;
}
touchdev = devm_kzalloc(dev, sizeof(*touchdev), GFP_KERNEL);
if (!touchdev)
return -ENOMEM;
touchdev->pdev = pdev;
touchdev->channels = channels;
error = of_property_read_u32(dev->of_node, "vf50-ts-min-pressure",
&touchdev->min_pressure);
if (error)
return error;
input = devm_input_allocate_device(dev);
if (!input) {
dev_err(dev, "Failed to allocate TS input device\n");
return -ENOMEM;
}
platform_set_drvdata(pdev, touchdev);
input->name = DRIVER_NAME;
input->id.bustype = BUS_HOST;
input->dev.parent = dev;
input->open = vf50_ts_open;
input->close = vf50_ts_close;
input_set_capability(input, EV_KEY, BTN_TOUCH);
input_set_abs_params(input, ABS_X, 0, VF_ADC_MAX, 0, 0);
input_set_abs_params(input, ABS_Y, 0, VF_ADC_MAX, 0, 0);
input_set_abs_params(input, ABS_PRESSURE, 0, VF_ADC_MAX, 0, 0);
touchdev->ts_input = input;
input_set_drvdata(input, touchdev);
error = input_register_device(input);
if (error) {
dev_err(dev, "Failed to register input device\n");
return error;
}
error = vf50_ts_get_gpiod(dev, &touchdev->gpio_xp, "xp", GPIOD_OUT_LOW);
if (error)
return error;
error = vf50_ts_get_gpiod(dev, &touchdev->gpio_xm,
"xm", GPIOD_OUT_LOW);
if (error)
return error;
error = vf50_ts_get_gpiod(dev, &touchdev->gpio_yp, "yp", GPIOD_OUT_LOW);
if (error)
return error;
error = vf50_ts_get_gpiod(dev, &touchdev->gpio_ym, "ym", GPIOD_OUT_LOW);
if (error)
return error;
touchdev->pen_irq = platform_get_irq(pdev, 0);
if (touchdev->pen_irq < 0)
return touchdev->pen_irq;
error = devm_request_threaded_irq(dev, touchdev->pen_irq,
NULL, vf50_ts_irq_bh, IRQF_ONESHOT,
"vf50 touch", touchdev);
if (error) {
dev_err(dev, "Failed to request IRQ %d: %d\n",
touchdev->pen_irq, error);
return error;
}
return 0;
}
static const struct of_device_id vf50_touch_of_match[] = {
{ .compatible = "toradex,vf50-touchscreen", },
{ }
};
MODULE_DEVICE_TABLE(of, vf50_touch_of_match);
static struct platform_driver vf50_touch_driver = {
.driver = {
.name = "toradex,vf50_touchctrl",
.of_match_table = vf50_touch_of_match,
},
.probe = vf50_ts_probe,
};
module_platform_driver(vf50_touch_driver);
MODULE_AUTHOR("Sanchayan Maity");
MODULE_DESCRIPTION("Colibri VF50 Touchscreen driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
......@@ -86,4 +86,3 @@ module_i2c_driver(cyttsp4_i2c_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) I2C driver");
MODULE_AUTHOR("Cypress");
MODULE_ALIAS("i2c:cyttsp4");
......@@ -86,4 +86,3 @@ module_i2c_driver(cyttsp_i2c_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Cypress TrueTouch(R) Standard Product (TTSP) I2C driver");
MODULE_AUTHOR("Cypress");
MODULE_ALIAS("i2c:cyttsp");
......@@ -102,7 +102,7 @@
#define ELAN_FW_PAGESIZE 132
/* calibration timeout definition */
#define ELAN_CALI_TIMEOUT_MSEC 10000
#define ELAN_CALI_TIMEOUT_MSEC 12000
#define ELAN_POWERON_DELAY_USEC 500
#define ELAN_RESET_DELAY_MSEC 20
......
/*
* Freescale i.MX6UL touchscreen controller driver
*
* Copyright (C) 2015 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/gpio/consumer.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/io.h>
/* ADC configuration registers field define */
#define ADC_AIEN (0x1 << 7)
#define ADC_CONV_DISABLE 0x1F
#define ADC_CAL (0x1 << 7)
#define ADC_CALF 0x2
#define ADC_12BIT_MODE (0x2 << 2)
#define ADC_IPG_CLK 0x00
#define ADC_CLK_DIV_8 (0x03 << 5)
#define ADC_SHORT_SAMPLE_MODE (0x0 << 4)
#define ADC_HARDWARE_TRIGGER (0x1 << 13)
#define SELECT_CHANNEL_4 0x04
#define SELECT_CHANNEL_1 0x01
#define DISABLE_CONVERSION_INT (0x0 << 7)
/* ADC registers */
#define REG_ADC_HC0 0x00
#define REG_ADC_HC1 0x04
#define REG_ADC_HC2 0x08
#define REG_ADC_HC3 0x0C
#define REG_ADC_HC4 0x10
#define REG_ADC_HS 0x14
#define REG_ADC_R0 0x18
#define REG_ADC_CFG 0x2C
#define REG_ADC_GC 0x30
#define REG_ADC_GS 0x34
#define ADC_TIMEOUT msecs_to_jiffies(100)
/* TSC registers */
#define REG_TSC_BASIC_SETING 0x00
#define REG_TSC_PRE_CHARGE_TIME 0x10
#define REG_TSC_FLOW_CONTROL 0x20
#define REG_TSC_MEASURE_VALUE 0x30
#define REG_TSC_INT_EN 0x40
#define REG_TSC_INT_SIG_EN 0x50
#define REG_TSC_INT_STATUS 0x60
#define REG_TSC_DEBUG_MODE 0x70
#define REG_TSC_DEBUG_MODE2 0x80
/* TSC configuration registers field define */
#define DETECT_4_WIRE_MODE (0x0 << 4)
#define AUTO_MEASURE 0x1
#define MEASURE_SIGNAL 0x1
#define DETECT_SIGNAL (0x1 << 4)
#define VALID_SIGNAL (0x1 << 8)
#define MEASURE_INT_EN 0x1
#define MEASURE_SIG_EN 0x1
#define VALID_SIG_EN (0x1 << 8)
#define DE_GLITCH_2 (0x2 << 29)
#define START_SENSE (0x1 << 12)
#define TSC_DISABLE (0x1 << 16)
#define DETECT_MODE 0x2
struct imx6ul_tsc {
struct device *dev;
struct input_dev *input;
void __iomem *tsc_regs;
void __iomem *adc_regs;
struct clk *tsc_clk;
struct clk *adc_clk;
struct gpio_desc *xnur_gpio;
int measure_delay_time;
int pre_charge_time;
struct completion completion;
};
/*
* TSC module need ADC to get the measure value. So
* before config TSC, we should initialize ADC module.
*/
static void imx6ul_adc_init(struct imx6ul_tsc *tsc)
{
int adc_hc = 0;
int adc_gc;
int adc_gs;
int adc_cfg;
int timeout;
reinit_completion(&tsc->completion);
adc_cfg = readl(tsc->adc_regs + REG_ADC_CFG);
adc_cfg |= ADC_12BIT_MODE | ADC_IPG_CLK;
adc_cfg |= ADC_CLK_DIV_8 | ADC_SHORT_SAMPLE_MODE;
adc_cfg &= ~ADC_HARDWARE_TRIGGER;
writel(adc_cfg, tsc->adc_regs + REG_ADC_CFG);
/* enable calibration interrupt */
adc_hc |= ADC_AIEN;
adc_hc |= ADC_CONV_DISABLE;
writel(adc_hc, tsc->adc_regs + REG_ADC_HC0);
/* start ADC calibration */
adc_gc = readl(tsc->adc_regs + REG_ADC_GC);
adc_gc |= ADC_CAL;
writel(adc_gc, tsc->adc_regs + REG_ADC_GC);
timeout = wait_for_completion_timeout
(&tsc->completion, ADC_TIMEOUT);
if (timeout == 0)
dev_err(tsc->dev, "Timeout for adc calibration\n");
adc_gs = readl(tsc->adc_regs + REG_ADC_GS);
if (adc_gs & ADC_CALF)
dev_err(tsc->dev, "ADC calibration failed\n");
/* TSC need the ADC work in hardware trigger */
adc_cfg = readl(tsc->adc_regs + REG_ADC_CFG);
adc_cfg |= ADC_HARDWARE_TRIGGER;
writel(adc_cfg, tsc->adc_regs + REG_ADC_CFG);
}
/*
* This is a TSC workaround. Currently TSC misconnect two
* ADC channels, this function remap channel configure for
* hardware trigger.
*/
static void imx6ul_tsc_channel_config(struct imx6ul_tsc *tsc)
{
int adc_hc0, adc_hc1, adc_hc2, adc_hc3, adc_hc4;
adc_hc0 = DISABLE_CONVERSION_INT;
writel(adc_hc0, tsc->adc_regs + REG_ADC_HC0);
adc_hc1 = DISABLE_CONVERSION_INT | SELECT_CHANNEL_4;
writel(adc_hc1, tsc->adc_regs + REG_ADC_HC1);
adc_hc2 = DISABLE_CONVERSION_INT;
writel(adc_hc2, tsc->adc_regs + REG_ADC_HC2);
adc_hc3 = DISABLE_CONVERSION_INT | SELECT_CHANNEL_1;
writel(adc_hc3, tsc->adc_regs + REG_ADC_HC3);
adc_hc4 = DISABLE_CONVERSION_INT;
writel(adc_hc4, tsc->adc_regs + REG_ADC_HC4);
}
/*
* TSC setting, confige the pre-charge time and measure delay time.
* different touch screen may need different pre-charge time and
* measure delay time.
*/
static void imx6ul_tsc_set(struct imx6ul_tsc *tsc)
{
int basic_setting = 0;
int start;
basic_setting |= tsc->measure_delay_time << 8;
basic_setting |= DETECT_4_WIRE_MODE | AUTO_MEASURE;
writel(basic_setting, tsc->tsc_regs + REG_TSC_BASIC_SETING);
writel(DE_GLITCH_2, tsc->tsc_regs + REG_TSC_DEBUG_MODE2);
writel(tsc->pre_charge_time, tsc->tsc_regs + REG_TSC_PRE_CHARGE_TIME);
writel(MEASURE_INT_EN, tsc->tsc_regs + REG_TSC_INT_EN);
writel(MEASURE_SIG_EN | VALID_SIG_EN,
tsc->tsc_regs + REG_TSC_INT_SIG_EN);
/* start sense detection */
start = readl(tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
start |= START_SENSE;
start &= ~TSC_DISABLE;
writel(start, tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
}
static void imx6ul_tsc_init(struct imx6ul_tsc *tsc)
{
imx6ul_adc_init(tsc);
imx6ul_tsc_channel_config(tsc);
imx6ul_tsc_set(tsc);
}
static void imx6ul_tsc_disable(struct imx6ul_tsc *tsc)
{
int tsc_flow;
int adc_cfg;
/* TSC controller enters to idle status */
tsc_flow = readl(tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
tsc_flow |= TSC_DISABLE;
writel(tsc_flow, tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
/* ADC controller enters to stop mode */
adc_cfg = readl(tsc->adc_regs + REG_ADC_HC0);
adc_cfg |= ADC_CONV_DISABLE;
writel(adc_cfg, tsc->adc_regs + REG_ADC_HC0);
}
/* Delay some time (max 2ms), wait the pre-charge done. */
static bool tsc_wait_detect_mode(struct imx6ul_tsc *tsc)
{
unsigned long timeout = jiffies + msecs_to_jiffies(2);
int state_machine;
int debug_mode2;
do {
if (time_after(jiffies, timeout))
return false;
usleep_range(200, 400);
debug_mode2 = readl(tsc->tsc_regs + REG_TSC_DEBUG_MODE2);
state_machine = (debug_mode2 >> 20) & 0x7;
} while (state_machine != DETECT_MODE);
usleep_range(200, 400);
return true;
}
static irqreturn_t tsc_irq_fn(int irq, void *dev_id)
{
struct imx6ul_tsc *tsc = dev_id;
int status;
int value;
int x, y;
int start;
status = readl(tsc->tsc_regs + REG_TSC_INT_STATUS);
/* write 1 to clear the bit measure-signal */
writel(MEASURE_SIGNAL | DETECT_SIGNAL,
tsc->tsc_regs + REG_TSC_INT_STATUS);
/* It's a HW self-clean bit. Set this bit and start sense detection */
start = readl(tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
start |= START_SENSE;
writel(start, tsc->tsc_regs + REG_TSC_FLOW_CONTROL);
if (status & MEASURE_SIGNAL) {
value = readl(tsc->tsc_regs + REG_TSC_MEASURE_VALUE);
x = (value >> 16) & 0x0fff;
y = value & 0x0fff;
/*
* In detect mode, we can get the xnur gpio value,
* otherwise assume contact is stiull active.
*/
if (!tsc_wait_detect_mode(tsc) ||
gpiod_get_value_cansleep(tsc->xnur_gpio)) {
input_report_key(tsc->input, BTN_TOUCH, 1);
input_report_abs(tsc->input, ABS_X, x);
input_report_abs(tsc->input, ABS_Y, y);
} else {
input_report_key(tsc->input, BTN_TOUCH, 0);
}
input_sync(tsc->input);
}
return IRQ_HANDLED;
}
static irqreturn_t adc_irq_fn(int irq, void *dev_id)
{
struct imx6ul_tsc *tsc = dev_id;
int coco;
int value;
coco = readl(tsc->adc_regs + REG_ADC_HS);
if (coco & 0x01) {
value = readl(tsc->adc_regs + REG_ADC_R0);
complete(&tsc->completion);
}
return IRQ_HANDLED;
}
static int imx6ul_tsc_open(struct input_dev *input_dev)
{
struct imx6ul_tsc *tsc = input_get_drvdata(input_dev);
int err;
err = clk_prepare_enable(tsc->adc_clk);
if (err) {
dev_err(tsc->dev,
"Could not prepare or enable the adc clock: %d\n",
err);
return err;
}
err = clk_prepare_enable(tsc->tsc_clk);
if (err) {
dev_err(tsc->dev,
"Could not prepare or enable the tsc clock: %d\n",
err);
clk_disable_unprepare(tsc->adc_clk);
return err;
}
imx6ul_tsc_init(tsc);
return 0;
}
static void imx6ul_tsc_close(struct input_dev *input_dev)
{
struct imx6ul_tsc *tsc = input_get_drvdata(input_dev);
imx6ul_tsc_disable(tsc);
clk_disable_unprepare(tsc->tsc_clk);
clk_disable_unprepare(tsc->adc_clk);
}
static int imx6ul_tsc_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct imx6ul_tsc *tsc;
struct input_dev *input_dev;
struct resource *tsc_mem;
struct resource *adc_mem;
int err;
int tsc_irq;
int adc_irq;
tsc = devm_kzalloc(&pdev->dev, sizeof(struct imx6ul_tsc), GFP_KERNEL);
if (!tsc)
return -ENOMEM;
input_dev = devm_input_allocate_device(&pdev->dev);
if (!input_dev)
return -ENOMEM;
input_dev->name = "iMX6UL TouchScreen Controller";
input_dev->id.bustype = BUS_HOST;
input_dev->open = imx6ul_tsc_open;
input_dev->close = imx6ul_tsc_close;
input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
input_set_abs_params(input_dev, ABS_X, 0, 0xFFF, 0, 0);
input_set_abs_params(input_dev, ABS_Y, 0, 0xFFF, 0, 0);
input_set_drvdata(input_dev, tsc);
tsc->dev = &pdev->dev;
tsc->input = input_dev;
init_completion(&tsc->completion);
tsc->xnur_gpio = devm_gpiod_get(&pdev->dev, "xnur", GPIOD_IN);
if (IS_ERR(tsc->xnur_gpio)) {
err = PTR_ERR(tsc->xnur_gpio);
dev_err(&pdev->dev,
"failed to request GPIO tsc_X- (xnur): %d\n", err);
return err;
}
tsc_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
tsc->tsc_regs = devm_ioremap_resource(&pdev->dev, tsc_mem);
if (IS_ERR(tsc->tsc_regs)) {
err = PTR_ERR(tsc->tsc_regs);
dev_err(&pdev->dev, "failed to remap tsc memory: %d\n", err);
return err;
}
adc_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
tsc->adc_regs = devm_ioremap_resource(&pdev->dev, adc_mem);
if (IS_ERR(tsc->adc_regs)) {
err = PTR_ERR(tsc->adc_regs);
dev_err(&pdev->dev, "failed to remap adc memory: %d\n", err);
return err;
}
tsc->tsc_clk = devm_clk_get(&pdev->dev, "tsc");
if (IS_ERR(tsc->tsc_clk)) {
err = PTR_ERR(tsc->tsc_clk);
dev_err(&pdev->dev, "failed getting tsc clock: %d\n", err);
return err;
}
tsc->adc_clk = devm_clk_get(&pdev->dev, "adc");
if (IS_ERR(tsc->adc_clk)) {
err = PTR_ERR(tsc->adc_clk);
dev_err(&pdev->dev, "failed getting adc clock: %d\n", err);
return err;
}
tsc_irq = platform_get_irq(pdev, 0);
if (tsc_irq < 0) {
dev_err(&pdev->dev, "no tsc irq resource?\n");
return tsc_irq;
}
adc_irq = platform_get_irq(pdev, 1);
if (adc_irq <= 0) {
dev_err(&pdev->dev, "no adc irq resource?\n");
return adc_irq;
}
err = devm_request_threaded_irq(tsc->dev, tsc_irq,
NULL, tsc_irq_fn, IRQF_ONESHOT,
dev_name(&pdev->dev), tsc);
if (err) {
dev_err(&pdev->dev,
"failed requesting tsc irq %d: %d\n",
tsc_irq, err);
return err;
}
err = devm_request_irq(tsc->dev, adc_irq, adc_irq_fn, 0,
dev_name(&pdev->dev), tsc);
if (err) {
dev_err(&pdev->dev,
"failed requesting adc irq %d: %d\n",
adc_irq, err);
return err;
}
err = of_property_read_u32(np, "measure-delay-time",
&tsc->measure_delay_time);
if (err)
tsc->measure_delay_time = 0xffff;
err = of_property_read_u32(np, "pre-charge-time",
&tsc->pre_charge_time);
if (err)
tsc->pre_charge_time = 0xfff;
err = input_register_device(tsc->input);
if (err) {
dev_err(&pdev->dev,
"failed to register input device: %d\n", err);
return err;
}
platform_set_drvdata(pdev, tsc);
return 0;
}
static int __maybe_unused imx6ul_tsc_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct imx6ul_tsc *tsc = platform_get_drvdata(pdev);
struct input_dev *input_dev = tsc->input;
mutex_lock(&input_dev->mutex);
if (input_dev->users) {
imx6ul_tsc_disable(tsc);
clk_disable_unprepare(tsc->tsc_clk);
clk_disable_unprepare(tsc->adc_clk);
}
mutex_unlock(&input_dev->mutex);
return 0;
}
static int __maybe_unused imx6ul_tsc_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct imx6ul_tsc *tsc = platform_get_drvdata(pdev);
struct input_dev *input_dev = tsc->input;
int retval = 0;
mutex_lock(&input_dev->mutex);
if (input_dev->users) {
retval = clk_prepare_enable(tsc->adc_clk);
if (retval)
goto out;
retval = clk_prepare_enable(tsc->tsc_clk);
if (retval) {
clk_disable_unprepare(tsc->adc_clk);
goto out;
}
imx6ul_tsc_init(tsc);
}
out:
mutex_unlock(&input_dev->mutex);
return retval;
}
static SIMPLE_DEV_PM_OPS(imx6ul_tsc_pm_ops,
imx6ul_tsc_suspend, imx6ul_tsc_resume);
static const struct of_device_id imx6ul_tsc_match[] = {
{ .compatible = "fsl,imx6ul-tsc", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx6ul_tsc_match);
static struct platform_driver imx6ul_tsc_driver = {
.driver = {
.name = "imx6ul-tsc",
.of_match_table = imx6ul_tsc_match,
.pm = &imx6ul_tsc_pm_ops,
},
.probe = imx6ul_tsc_probe,
};
module_platform_driver(imx6ul_tsc_driver);
MODULE_AUTHOR("Haibo Chen <haibo.chen@freescale.com>");
MODULE_DESCRIPTION("Freescale i.MX6UL Touchscreen controller driver");
MODULE_LICENSE("GPL v2");
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