Merge branch 'for-4.20/i2c-hid' into for-linus

- general cleanups of hid-i2c driver
- SPIODEV device descriptor fixes

drivers/hid/i2c-hid/Makefile

@@ -3,3 +3,6 @@
 #
 
 obj-$(CONFIG_I2C_HID)				+= i2c-hid.o
+
+i2c-hid-objs					=  i2c-hid-core.o
+i2c-hid-$(CONFIG_DMI)				+= i2c-hid-dmi-quirks.o

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

@@ -43,6 +43,7 @@
 #include <linux/platform_data/i2c-hid.h>
 
 #include "../hid-ids.h"
+#include "i2c-hid.h"
 
 /* quirks to control the device */
 #define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV	BIT(0)
@@ -668,6 +669,7 @@ static int i2c_hid_parse(struct hid_device *hid)
 	char *rdesc;
 	int ret;
 	int tries = 3;
+	char *use_override;
 
 	i2c_hid_dbg(ihid, "entering %s\n", __func__);
 
@@ -686,26 +688,37 @@ static int i2c_hid_parse(struct hid_device *hid)
 	if (ret)
 		return ret;
 
-	rdesc = kzalloc(rsize, GFP_KERNEL);
+	use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name,
+								&rsize);
 
-	if (!rdesc) {
-		dbg_hid("couldn't allocate rdesc memory\n");
-		return -ENOMEM;
-	}
-
-	i2c_hid_dbg(ihid, "asking HID report descriptor\n");
-
-	ret = i2c_hid_command(client, &hid_report_descr_cmd, rdesc, rsize);
-	if (ret) {
-		hid_err(hid, "reading report descriptor failed\n");
-		kfree(rdesc);
-		return -EIO;
+	if (use_override) {
+		rdesc = use_override;
+		i2c_hid_dbg(ihid, "Using a HID report descriptor override\n");
+	} else {
+		rdesc = kzalloc(rsize, GFP_KERNEL);
+
+		if (!rdesc) {
+			dbg_hid("couldn't allocate rdesc memory\n");
+			return -ENOMEM;
+		}
+
+		i2c_hid_dbg(ihid, "asking HID report descriptor\n");
+
+		ret = i2c_hid_command(client, &hid_report_descr_cmd,
+				      rdesc, rsize);
+		if (ret) {
+			hid_err(hid, "reading report descriptor failed\n");
+			kfree(rdesc);
+			return -EIO;
+		}
 	}
 
 	i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
 
 	ret = hid_parse_report(hid, rdesc, rsize);
-	kfree(rdesc);
+	if (!use_override)
+		kfree(rdesc);
+
 	if (ret) {
 		dbg_hid("parsing report descriptor failed\n");
 		return ret;
@@ -832,12 +845,19 @@ static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
 	int ret;
 
 	/* i2c hid fetch using a fixed descriptor size (30 bytes) */
-	i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
-	ret = i2c_hid_command(client, &hid_descr_cmd, ihid->hdesc_buffer,
-				sizeof(struct i2c_hid_desc));
-	if (ret) {
-		dev_err(&client->dev, "hid_descr_cmd failed\n");
-		return -ENODEV;
+	if (i2c_hid_get_dmi_i2c_hid_desc_override(client->name)) {
+		i2c_hid_dbg(ihid, "Using a HID descriptor override\n");
+		ihid->hdesc =
+			*i2c_hid_get_dmi_i2c_hid_desc_override(client->name);
+	} else {
+		i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
+		ret = i2c_hid_command(client, &hid_descr_cmd,
+				      ihid->hdesc_buffer,
+				      sizeof(struct i2c_hid_desc));
+		if (ret) {
+			dev_err(&client->dev, "hid_descr_cmd failed\n");
+			return -ENODEV;
+		}
 	}
 
 	/* Validate the length of HID descriptor, the 4 first bytes:

drivers/hid/i2c-hid/i2c-hid.h

+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#ifndef I2C_HID_H
+#define I2C_HID_H
+
+
+#ifdef CONFIG_DMI
+struct i2c_hid_desc *i2c_hid_get_dmi_i2c_hid_desc_override(uint8_t *i2c_name);
+char *i2c_hid_get_dmi_hid_report_desc_override(uint8_t *i2c_name,
+					       unsigned int *size);
+#else
+static inline struct i2c_hid_desc
+		   *i2c_hid_get_dmi_i2c_hid_desc_override(uint8_t *i2c_name)
+{ return NULL; }
+static inline char *i2c_hid_get_dmi_hid_report_desc_override(uint8_t *i2c_name,
+							     unsigned int *size)
+{ return NULL; }
+#endif
+
+#endif

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

@@ -280,14 +280,14 @@ static int write_ipc_from_queue(struct ishtp_device *dev)
 	 * if tx send list is empty - return 0;
 	 * may happen, as RX_COMPLETE handler doesn't check list emptiness.
 	 */
-	if (list_empty(&dev->wr_processing_list_head.link)) {
+	if (list_empty(&dev->wr_processing_list)) {
 		spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
 		out_ipc_locked = 0;
 		return	0;
 	}
 
-	ipc_link = list_entry(dev->wr_processing_list_head.link.next,
-			      struct wr_msg_ctl_info, link);
+	ipc_link = list_first_entry(&dev->wr_processing_list,
+				    struct wr_msg_ctl_info, link);
 	/* first 4 bytes of the data is the doorbell value (IPC header) */
 	length = ipc_link->length - sizeof(uint32_t);
 	doorbell_val = *(uint32_t *)ipc_link->inline_data;
@@ -338,7 +338,7 @@ static int write_ipc_from_queue(struct ishtp_device *dev)
 	ipc_send_compl = ipc_link->ipc_send_compl;
 	ipc_send_compl_prm = ipc_link->ipc_send_compl_prm;
 	list_del_init(&ipc_link->link);
-	list_add_tail(&ipc_link->link, &dev->wr_free_list_head.link);
+	list_add(&ipc_link->link, &dev->wr_free_list);
 	spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
 
 	/*
@@ -372,18 +372,18 @@ static int write_ipc_to_queue(struct ishtp_device *dev,
 	unsigned char *msg, int length)
 {
 	struct wr_msg_ctl_info *ipc_link;
-	unsigned long	flags;
+	unsigned long flags;
 
 	if (length > IPC_FULL_MSG_SIZE)
 		return -EMSGSIZE;
 
 	spin_lock_irqsave(&dev->wr_processing_spinlock, flags);
-	if (list_empty(&dev->wr_free_list_head.link)) {
+	if (list_empty(&dev->wr_free_list)) {
 		spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
 		return -ENOMEM;
 	}
-	ipc_link = list_entry(dev->wr_free_list_head.link.next,
-		struct wr_msg_ctl_info, link);
+	ipc_link = list_first_entry(&dev->wr_free_list,
+				    struct wr_msg_ctl_info, link);
 	list_del_init(&ipc_link->link);
 
 	ipc_link->ipc_send_compl = ipc_send_compl;
@@ -391,7 +391,7 @@ static int write_ipc_to_queue(struct ishtp_device *dev,
 	ipc_link->length = length;
 	memcpy(ipc_link->inline_data, msg, length);
 
-	list_add_tail(&ipc_link->link, &dev->wr_processing_list_head.link);
+	list_add_tail(&ipc_link->link, &dev->wr_processing_list);
 	spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
 
 	write_ipc_from_queue(dev);
@@ -487,17 +487,13 @@ static int ish_fw_reset_handler(struct ishtp_device *dev)
 {
 	uint32_t	reset_id;
 	unsigned long	flags;
-	struct wr_msg_ctl_info *processing, *next;
 
 	/* Read reset ID */
 	reset_id = ish_reg_read(dev, IPC_REG_ISH2HOST_MSG) & 0xFFFF;
 
 	/* Clear IPC output queue */
 	spin_lock_irqsave(&dev->wr_processing_spinlock, flags);
-	list_for_each_entry_safe(processing, next,
-			&dev->wr_processing_list_head.link, link) {
-		list_move_tail(&processing->link, &dev->wr_free_list_head.link);
-	}
+	list_splice_init(&dev->wr_processing_list, &dev->wr_free_list);
 	spin_unlock_irqrestore(&dev->wr_processing_spinlock, flags);
 
 	/* ISHTP notification in IPC_RESET */
@@ -921,9 +917,9 @@ struct ishtp_device *ish_dev_init(struct pci_dev *pdev)
 	spin_lock_init(&dev->out_ipc_spinlock);
 
 	/* Init IPC processing and free lists */
-	INIT_LIST_HEAD(&dev->wr_processing_list_head.link);
-	INIT_LIST_HEAD(&dev->wr_free_list_head.link);
-	for (i = 0; i < IPC_TX_FIFO_SIZE; ++i) {
+	INIT_LIST_HEAD(&dev->wr_processing_list);
+	INIT_LIST_HEAD(&dev->wr_free_list);
+	for (i = 0; i < IPC_TX_FIFO_SIZE; i++) {
 		struct wr_msg_ctl_info	*tx_buf;
 
 		tx_buf = devm_kzalloc(&pdev->dev,
@@ -939,7 +935,7 @@ struct ishtp_device *ish_dev_init(struct pci_dev *pdev)
 				i);
 			break;
 		}
-		list_add_tail(&tx_buf->link, &dev->wr_free_list_head.link);
+		list_add_tail(&tx_buf->link, &dev->wr_free_list);
 	}
 
 	dev->ops = &ish_hw_ops;

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

@@ -115,18 +115,19 @@ static const struct pci_device_id ish_invalid_pci_ids[] = {
  */
 static int ish_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
-	struct ishtp_device *dev;
+	int ret;
 	struct ish_hw *hw;
-	int	ret;
+	struct ishtp_device *ishtp;
+	struct device *dev = &pdev->dev;
 
 	/* Check for invalid platforms for ISH support */
 	if (pci_dev_present(ish_invalid_pci_ids))
 		return -ENODEV;
 
 	/* enable pci dev */
-	ret = pci_enable_device(pdev);
+	ret = pcim_enable_device(pdev);
 	if (ret) {
-		dev_err(&pdev->dev, "ISH: Failed to enable PCI device\n");
+		dev_err(dev, "ISH: Failed to enable PCI device\n");
 		return ret;
 	}
 
@@ -134,65 +135,44 @@ static int ish_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	pci_set_master(pdev);
 
 	/* pci request regions for ISH driver */
-	ret = pci_request_regions(pdev, KBUILD_MODNAME);
+	ret = pcim_iomap_regions(pdev, 1 << 0, KBUILD_MODNAME);
 	if (ret) {
-		dev_err(&pdev->dev, "ISH: Failed to get PCI regions\n");
-		goto disable_device;
+		dev_err(dev, "ISH: Failed to get PCI regions\n");
+		return ret;
 	}
 
 	/* allocates and initializes the ISH dev structure */
-	dev = ish_dev_init(pdev);
-	if (!dev) {
+	ishtp = ish_dev_init(pdev);
+	if (!ishtp) {
 		ret = -ENOMEM;
-		goto release_regions;
+		return ret;
 	}
-	hw = to_ish_hw(dev);
-	dev->print_log = ish_event_tracer;
+	hw = to_ish_hw(ishtp);
+	ishtp->print_log = ish_event_tracer;
 
 	/* mapping IO device memory */
-	hw->mem_addr = pci_iomap(pdev, 0, 0);
-	if (!hw->mem_addr) {
-		dev_err(&pdev->dev, "ISH: mapping I/O range failure\n");
-		ret = -ENOMEM;
-		goto free_device;
-	}
-
-	dev->pdev = pdev;
-
+	hw->mem_addr = pcim_iomap_table(pdev)[0];
+	ishtp->pdev = pdev;
 	pdev->dev_flags |= PCI_DEV_FLAGS_NO_D3;
 
 	/* request and enable interrupt */
-	ret = request_irq(pdev->irq, ish_irq_handler, IRQF_SHARED,
-			  KBUILD_MODNAME, dev);
+	ret = devm_request_irq(dev, pdev->irq, ish_irq_handler,
+			       IRQF_SHARED, KBUILD_MODNAME, ishtp);
 	if (ret) {
-		dev_err(&pdev->dev, "ISH: request IRQ failure (%d)\n",
-			pdev->irq);
-		goto free_device;
+		dev_err(dev, "ISH: request IRQ %d failed\n", pdev->irq);
+		return ret;
 	}
 
-	dev_set_drvdata(dev->devc, dev);
+	dev_set_drvdata(ishtp->devc, ishtp);
 
-	init_waitqueue_head(&dev->suspend_wait);
-	init_waitqueue_head(&dev->resume_wait);
+	init_waitqueue_head(&ishtp->suspend_wait);
+	init_waitqueue_head(&ishtp->resume_wait);
 
-	ret = ish_init(dev);
+	ret = ish_init(ishtp);
 	if (ret)
-		goto free_irq;
+		return ret;
 
 	return 0;
-
-free_irq:
-	free_irq(pdev->irq, dev);
-free_device:
-	pci_iounmap(pdev, hw->mem_addr);
-release_regions:
-	pci_release_regions(pdev);
-disable_device:
-	pci_clear_master(pdev);
-	pci_disable_device(pdev);
-	dev_err(&pdev->dev, "ISH: PCI driver initialization failed.\n");
-
-	return ret;
 }
 
 /**
@@ -204,16 +184,9 @@ static int ish_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 static void ish_remove(struct pci_dev *pdev)
 {
 	struct ishtp_device *ishtp_dev = pci_get_drvdata(pdev);
-	struct ish_hw *hw = to_ish_hw(ishtp_dev);
 
 	ishtp_bus_remove_all_clients(ishtp_dev, false);
 	ish_device_disable(ishtp_dev);
-
-	free_irq(pdev->irq, ishtp_dev);
-	pci_iounmap(pdev, hw->mem_addr);
-	pci_release_regions(pdev);
-	pci_clear_master(pdev);
-	pci_disable_device(pdev);
 }
 
 static struct device __maybe_unused *ish_resume_device;

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

@@ -320,23 +320,14 @@ static void process_recv(struct ishtp_cl *hid_ishtp_cl, void *recv_buf,
  */
 static void ish_cl_event_cb(struct ishtp_cl_device *device)
 {
-	struct ishtp_cl	*hid_ishtp_cl = device->driver_data;
+	struct ishtp_cl	*hid_ishtp_cl = ishtp_get_drvdata(device);
 	struct ishtp_cl_rb *rb_in_proc;
 	size_t r_length;
-	unsigned long flags;
 
 	if (!hid_ishtp_cl)
 		return;
 
-	spin_lock_irqsave(&hid_ishtp_cl->in_process_spinlock, flags);
-	while (!list_empty(&hid_ishtp_cl->in_process_list.list)) {
-		rb_in_proc = list_entry(
-			hid_ishtp_cl->in_process_list.list.next,
-			struct ishtp_cl_rb, list);
-		list_del_init(&rb_in_proc->list);
-		spin_unlock_irqrestore(&hid_ishtp_cl->in_process_spinlock,
-			flags);
-
+	while ((rb_in_proc = ishtp_cl_rx_get_rb(hid_ishtp_cl)) != NULL) {
 		if (!rb_in_proc->buffer.data)
 			return;
 
@@ -346,9 +337,7 @@ static void ish_cl_event_cb(struct ishtp_cl_device *device)
 		process_recv(hid_ishtp_cl, rb_in_proc->buffer.data, r_length);
 
 		ishtp_cl_io_rb_recycle(rb_in_proc);
-		spin_lock_irqsave(&hid_ishtp_cl->in_process_spinlock, flags);
 	}
-	spin_unlock_irqrestore(&hid_ishtp_cl->in_process_spinlock, flags);
 }
 
 /**
@@ -637,8 +626,8 @@ static int ishtp_get_report_descriptor(struct ishtp_cl *hid_ishtp_cl,
 static int hid_ishtp_cl_init(struct ishtp_cl *hid_ishtp_cl, int reset)
 {
 	struct ishtp_device *dev;
-	unsigned long flags;
 	struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data;
+	struct ishtp_fw_client *fw_client;
 	int i;
 	int rv;
 
@@ -660,16 +649,14 @@ static int hid_ishtp_cl_init(struct ishtp_cl *hid_ishtp_cl, int reset)
 	hid_ishtp_cl->rx_ring_size = HID_CL_RX_RING_SIZE;
 	hid_ishtp_cl->tx_ring_size = HID_CL_TX_RING_SIZE;
 
-	spin_lock_irqsave(&dev->fw_clients_lock, flags);
-	i = ishtp_fw_cl_by_uuid(dev, &hid_ishtp_guid);
-	if (i < 0) {
-		spin_unlock_irqrestore(&dev->fw_clients_lock, flags);
+	fw_client = ishtp_fw_cl_get_client(dev, &hid_ishtp_guid);
+	if (!fw_client) {
 		dev_err(&client_data->cl_device->dev,
 			"ish client uuid not found\n");
-		return i;
+		return -ENOENT;
 	}
-	hid_ishtp_cl->fw_client_id = dev->fw_clients[i].client_id;
-	spin_unlock_irqrestore(&dev->fw_clients_lock, flags);
+
+	hid_ishtp_cl->fw_client_id = fw_client->client_id;
 	hid_ishtp_cl->state = ISHTP_CL_CONNECTING;
 
 	rv = ishtp_cl_connect(hid_ishtp_cl);
@@ -765,7 +752,7 @@ static void hid_ishtp_cl_reset_handler(struct work_struct *work)
 	if (!hid_ishtp_cl)
 		return;
 
-	cl_device->driver_data = hid_ishtp_cl;
+	ishtp_set_drvdata(cl_device, hid_ishtp_cl);
 	hid_ishtp_cl->client_data = client_data;
 	client_data->hid_ishtp_cl = hid_ishtp_cl;
 
@@ -814,7 +801,7 @@ static int hid_ishtp_cl_probe(struct ishtp_cl_device *cl_device)
 	if (!hid_ishtp_cl)
 		return -ENOMEM;
 
-	cl_device->driver_data = hid_ishtp_cl;
+	ishtp_set_drvdata(cl_device, hid_ishtp_cl);
 	hid_ishtp_cl->client_data = client_data;
 	client_data->hid_ishtp_cl = hid_ishtp_cl;
 	client_data->cl_device = cl_device;
@@ -844,7 +831,7 @@ static int hid_ishtp_cl_probe(struct ishtp_cl_device *cl_device)
  */
 static int hid_ishtp_cl_remove(struct ishtp_cl_device *cl_device)
 {
-	struct ishtp_cl *hid_ishtp_cl = cl_device->driver_data;
+	struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
 	struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data;
 
 	hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
@@ -874,7 +861,7 @@ static int hid_ishtp_cl_remove(struct ishtp_cl_device *cl_device)
  */
 static int hid_ishtp_cl_reset(struct ishtp_cl_device *cl_device)
 {
-	struct ishtp_cl *hid_ishtp_cl = cl_device->driver_data;
+	struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
 	struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data;
 
 	hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
@@ -898,7 +885,7 @@ static int hid_ishtp_cl_reset(struct ishtp_cl_device *cl_device)
 static int hid_ishtp_cl_suspend(struct device *device)
 {
 	struct ishtp_cl_device *cl_device = to_ishtp_cl_device(device);
-	struct ishtp_cl *hid_ishtp_cl = cl_device->driver_data;
+	struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
 	struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data;
 
 	hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
@@ -919,7 +906,7 @@ static int hid_ishtp_cl_suspend(struct device *device)
 static int hid_ishtp_cl_resume(struct device *device)
 {
 	struct ishtp_cl_device *cl_device = to_ishtp_cl_device(device);
-	struct ishtp_cl *hid_ishtp_cl = cl_device->driver_data;
+	struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
 	struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data;
 
 	hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,

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

@@ -148,6 +148,31 @@ int ishtp_fw_cl_by_uuid(struct ishtp_device *dev, const uuid_le *uuid)
 }
 EXPORT_SYMBOL(ishtp_fw_cl_by_uuid);
 
+/**
+ * ishtp_fw_cl_get_client() - return client information to client
+ * @dev: the ishtp device structure
+ * @uuid: uuid of the client to search
+ *
+ * Search firmware client using UUID and reture related client information.
+ *
+ * Return: pointer of client information on success, NULL on failure.
+ */
+struct ishtp_fw_client *ishtp_fw_cl_get_client(struct ishtp_device *dev,
+						const uuid_le *uuid)
+{
+	int i;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->fw_clients_lock, flags);
+	i = ishtp_fw_cl_by_uuid(dev, uuid);
+	spin_unlock_irqrestore(&dev->fw_clients_lock, flags);
+	if (i < 0 || dev->fw_clients[i].props.fixed_address)
+		return NULL;
+
+	return &dev->fw_clients[i];
+}
+EXPORT_SYMBOL(ishtp_fw_cl_get_client);
+
 /**
  * ishtp_fw_cl_by_id() - return index to fw_clients for client_id
  * @dev: the ishtp device structure
@@ -563,6 +588,33 @@ void ishtp_put_device(struct ishtp_cl_device *cl_device)
 }
 EXPORT_SYMBOL(ishtp_put_device);
 
+/**
+ * ishtp_set_drvdata() - set client driver data
+ * @cl_device:	client device instance
+ * @data:	driver data need to be set
+ *
+ * Set client driver data to cl_device->driver_data.
+ */
+void ishtp_set_drvdata(struct ishtp_cl_device *cl_device, void *data)
+{
+	cl_device->driver_data = data;
+}
+EXPORT_SYMBOL(ishtp_set_drvdata);
+
+/**
+ * ishtp_get_drvdata() - get client driver data
+ * @cl_device:	client device instance
+ *
+ * Get client driver data from cl_device->driver_data.
+ *
+ * Return: pointer of driver data
+ */
+void *ishtp_get_drvdata(struct ishtp_cl_device *cl_device)
+{
+	return cl_device->driver_data;
+}
+EXPORT_SYMBOL(ishtp_get_drvdata);
+
 /**
  * ishtp_bus_new_client() - Create a new client
  * @dev:	ISHTP device instance

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

@@ -101,6 +101,9 @@ void	ishtp_reset_compl_handler(struct ishtp_device *dev);
 void	ishtp_put_device(struct ishtp_cl_device *);
 void	ishtp_get_device(struct ishtp_cl_device *);
 
+void	ishtp_set_drvdata(struct ishtp_cl_device *cl_device, void *data);
+void	*ishtp_get_drvdata(struct ishtp_cl_device *cl_device);
+
 int	__ishtp_cl_driver_register(struct ishtp_cl_driver *driver,
 				   struct module *owner);
 #define ishtp_cl_driver_register(driver)		\
@@ -110,5 +113,7 @@ void	ishtp_cl_driver_unregister(struct ishtp_cl_driver *driver);
 int	ishtp_register_event_cb(struct ishtp_cl_device *device,
 				void (*read_cb)(struct ishtp_cl_device *));
 int	ishtp_fw_cl_by_uuid(struct ishtp_device *dev, const uuid_le *cuuid);
+struct	ishtp_fw_client *ishtp_fw_cl_get_client(struct ishtp_device *dev,
+						const uuid_le *uuid);
 
 #endif /* _LINUX_ISHTP_CL_BUS_H */

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

@@ -69,6 +69,8 @@ int ishtp_cl_alloc_tx_ring(struct ishtp_cl *cl)
 	int	j;
 	unsigned long	flags;
 
+	cl->tx_ring_free_size = 0;
+
 	/* Allocate pool to free Tx bufs */
 	for (j = 0; j < cl->tx_ring_size; ++j) {
 		struct ishtp_cl_tx_ring	*tx_buf;
@@ -85,6 +87,7 @@ int ishtp_cl_alloc_tx_ring(struct ishtp_cl *cl)
 
 		spin_lock_irqsave(&cl->tx_free_list_spinlock, flags);
 		list_add_tail(&tx_buf->list, &cl->tx_free_list.list);
+		++cl->tx_ring_free_size;
 		spin_unlock_irqrestore(&cl->tx_free_list_spinlock, flags);
 	}
 	return	0;
@@ -144,6 +147,7 @@ void ishtp_cl_free_tx_ring(struct ishtp_cl *cl)
 		tx_buf = list_entry(cl->tx_free_list.list.next,
 				    struct ishtp_cl_tx_ring, list);
 		list_del(&tx_buf->list);
+		--cl->tx_ring_free_size;
 		kfree(tx_buf->send_buf.data);
 		kfree(tx_buf);
 	}
@@ -255,3 +259,48 @@ int ishtp_cl_io_rb_recycle(struct ishtp_cl_rb *rb)
 	return	rets;
 }
 EXPORT_SYMBOL(ishtp_cl_io_rb_recycle);
+
+/**
+ * ishtp_cl_tx_empty() -test whether client device tx buffer is empty
+ * @cl: Pointer to client device instance
+ *
+ * Look client device tx buffer list, and check whether this list is empty
+ *
+ * Return: true if client tx buffer list is empty else false
+ */
+bool ishtp_cl_tx_empty(struct ishtp_cl *cl)
+{
+	int tx_list_empty;
+	unsigned long tx_flags;
+
+	spin_lock_irqsave(&cl->tx_list_spinlock, tx_flags);
+	tx_list_empty = list_empty(&cl->tx_list.list);
+	spin_unlock_irqrestore(&cl->tx_list_spinlock, tx_flags);
+
+	return !!tx_list_empty;
+}
+EXPORT_SYMBOL(ishtp_cl_tx_empty);
+
+/**
+ * ishtp_cl_rx_get_rb() -Get a rb from client device rx buffer list
+ * @cl: Pointer to client device instance
+ *
+ * Check client device in-processing buffer list and get a rb from it.
+ *
+ * Return: rb pointer if buffer list isn't empty else NULL
+ */
+struct ishtp_cl_rb *ishtp_cl_rx_get_rb(struct ishtp_cl *cl)
+{
+	unsigned long rx_flags;
+	struct ishtp_cl_rb *rb;
+
+	spin_lock_irqsave(&cl->in_process_spinlock, rx_flags);
+	rb = list_first_entry_or_null(&cl->in_process_list.list,
+				struct ishtp_cl_rb, list);
+	if (rb)
+		list_del_init(&rb->list);
+	spin_unlock_irqrestore(&cl->in_process_spinlock, rx_flags);
+
+	return rb;
+}
+EXPORT_SYMBOL(ishtp_cl_rx_get_rb);

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

@@ -22,6 +22,25 @@
 #include "hbm.h"
 #include "client.h"
 
+int ishtp_cl_get_tx_free_buffer_size(struct ishtp_cl *cl)
+{
+	unsigned long tx_free_flags;
+	int size;
+
+	spin_lock_irqsave(&cl->tx_free_list_spinlock, tx_free_flags);
+	size = cl->tx_ring_free_size * cl->device->fw_client->props.max_msg_length;
+	spin_unlock_irqrestore(&cl->tx_free_list_spinlock, tx_free_flags);
+
+	return size;
+}
+EXPORT_SYMBOL(ishtp_cl_get_tx_free_buffer_size);
+
+int ishtp_cl_get_tx_free_rings(struct ishtp_cl *cl)
+{
+	return cl->tx_ring_free_size;
+}
+EXPORT_SYMBOL(ishtp_cl_get_tx_free_rings);
+
 /**
  * ishtp_read_list_flush() - Flush read queue
  * @cl: ishtp client instance
@@ -90,6 +109,7 @@ static void ishtp_cl_init(struct ishtp_cl *cl, struct ishtp_device *dev)
 
 	cl->rx_ring_size = CL_DEF_RX_RING_SIZE;
 	cl->tx_ring_size = CL_DEF_TX_RING_SIZE;
+	cl->tx_ring_free_size = cl->tx_ring_size;
 
 	/* dma */
 	cl->last_tx_path = CL_TX_PATH_IPC;
@@ -577,6 +597,8 @@ int ishtp_cl_send(struct ishtp_cl *cl, uint8_t *buf, size_t length)
 	 * max ISHTP message size per client
 	 */
 	list_del_init(&cl_msg->list);
+	--cl->tx_ring_free_size;
+
 	spin_unlock_irqrestore(&cl->tx_free_list_spinlock, tx_free_flags);
 	memcpy(cl_msg->send_buf.data, buf, length);
 	cl_msg->send_buf.size = length;
@@ -685,6 +707,7 @@ static void ipc_tx_callback(void *prm)
 		ishtp_write_message(dev, &ishtp_hdr, pmsg);
 		spin_lock_irqsave(&cl->tx_free_list_spinlock, tx_free_flags);
 		list_add_tail(&cl_msg->list, &cl->tx_free_list.list);
+		++cl->tx_ring_free_size;
 		spin_unlock_irqrestore(&cl->tx_free_list_spinlock,
 			tx_free_flags);
 	} else {
@@ -778,6 +801,7 @@ static void ishtp_cl_send_msg_dma(struct ishtp_device *dev,
 	ishtp_write_message(dev, &hdr, (unsigned char *)&dma_xfer);
 	spin_lock_irqsave(&cl->tx_free_list_spinlock, tx_free_flags);
 	list_add_tail(&cl_msg->list, &cl->tx_free_list.list);
+	++cl->tx_ring_free_size;
 	spin_unlock_irqrestore(&cl->tx_free_list_spinlock, tx_free_flags);
 	++cl->send_msg_cnt_dma;
 }

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

@@ -84,6 +84,7 @@ struct ishtp_cl {
 	/* Client Tx buffers list */
 	unsigned int	tx_ring_size;
 	struct ishtp_cl_tx_ring	tx_list, tx_free_list;
+	int		tx_ring_free_size;
 	spinlock_t	tx_list_spinlock;
 	spinlock_t	tx_free_list_spinlock;
 	size_t	tx_offs;	/* Offset in buffer at head of 'tx_list' */
@@ -137,6 +138,8 @@ int ishtp_cl_alloc_rx_ring(struct ishtp_cl *cl);
 int ishtp_cl_alloc_tx_ring(struct ishtp_cl *cl);
 void ishtp_cl_free_rx_ring(struct ishtp_cl *cl);
 void ishtp_cl_free_tx_ring(struct ishtp_cl *cl);
+int ishtp_cl_get_tx_free_buffer_size(struct ishtp_cl *cl);
+int ishtp_cl_get_tx_free_rings(struct ishtp_cl *cl);
 
 /* DMA I/F functions */
 void recv_ishtp_cl_msg_dma(struct ishtp_device *dev, void *msg,
@@ -178,5 +181,7 @@ int ishtp_cl_flush_queues(struct ishtp_cl *cl);
 
 /* exported functions from ISHTP client buffer management scope */
 int ishtp_cl_io_rb_recycle(struct ishtp_cl_rb *rb);
+bool ishtp_cl_tx_empty(struct ishtp_cl *cl);
+struct ishtp_cl_rb *ishtp_cl_rx_get_rb(struct ishtp_cl *cl);
 
 #endif /* _ISHTP_CLIENT_H_ */

drivers/hid/intel-ish-hid/ishtp/ishtp-dev.h

@@ -207,7 +207,7 @@ struct ishtp_device {
 	struct work_struct bh_hbm_work;
 
 	/* IPC write queue */
-	struct wr_msg_ctl_info wr_processing_list_head, wr_free_list_head;
+	struct list_head wr_processing_list, wr_free_list;
 	/* For both processing list  and free list */
 	spinlock_t wr_processing_spinlock;