--- /dev/null
-#define I2C_HID_QUIRK_RESEND_REPORT_DESCR BIT(2)
+ /*
+ * HID over I2C protocol implementation
+ *
+ * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
+ * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
+ * Copyright (c) 2012 Red Hat, Inc
+ *
+ * This code is partly based on "USB HID support for Linux":
+ *
+ * Copyright (c) 1999 Andreas Gal
+ * Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
+ * Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
+ * Copyright (c) 2007-2008 Oliver Neukum
+ * Copyright (c) 2006-2010 Jiri Kosina
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive for
+ * more details.
+ */
+
+ #include <linux/module.h>
+ #include <linux/i2c.h>
+ #include <linux/interrupt.h>
+ #include <linux/input.h>
+ #include <linux/irq.h>
+ #include <linux/delay.h>
+ #include <linux/slab.h>
+ #include <linux/pm.h>
+ #include <linux/pm_runtime.h>
+ #include <linux/device.h>
+ #include <linux/wait.h>
+ #include <linux/err.h>
+ #include <linux/string.h>
+ #include <linux/list.h>
+ #include <linux/jiffies.h>
+ #include <linux/kernel.h>
+ #include <linux/hid.h>
+ #include <linux/mutex.h>
+ #include <linux/acpi.h>
+ #include <linux/of.h>
+ #include <linux/regulator/consumer.h>
+
+ #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)
+ #define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET BIT(1)
- I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
- { USB_VENDOR_ID_SIS_TOUCH, USB_DEVICE_ID_SIS10FB_TOUCH,
- I2C_HID_QUIRK_RESEND_REPORT_DESCR },
++#define I2C_HID_QUIRK_NO_RUNTIME_PM BIT(2)
+
+ /* flags */
+ #define I2C_HID_STARTED 0
+ #define I2C_HID_RESET_PENDING 1
+ #define I2C_HID_READ_PENDING 2
+
+ #define I2C_HID_PWR_ON 0x00
+ #define I2C_HID_PWR_SLEEP 0x01
+
+ /* debug option */
+ static bool debug;
+ module_param(debug, bool, 0444);
+ MODULE_PARM_DESC(debug, "print a lot of debug information");
+
+ #define i2c_hid_dbg(ihid, fmt, arg...) \
+ do { \
+ if (debug) \
+ dev_printk(KERN_DEBUG, &(ihid)->client->dev, fmt, ##arg); \
+ } while (0)
+
+ struct i2c_hid_desc {
+ __le16 wHIDDescLength;
+ __le16 bcdVersion;
+ __le16 wReportDescLength;
+ __le16 wReportDescRegister;
+ __le16 wInputRegister;
+ __le16 wMaxInputLength;
+ __le16 wOutputRegister;
+ __le16 wMaxOutputLength;
+ __le16 wCommandRegister;
+ __le16 wDataRegister;
+ __le16 wVendorID;
+ __le16 wProductID;
+ __le16 wVersionID;
+ __le32 reserved;
+ } __packed;
+
+ struct i2c_hid_cmd {
+ unsigned int registerIndex;
+ __u8 opcode;
+ unsigned int length;
+ bool wait;
+ };
+
+ union command {
+ u8 data[0];
+ struct cmd {
+ __le16 reg;
+ __u8 reportTypeID;
+ __u8 opcode;
+ } __packed c;
+ };
+
+ #define I2C_HID_CMD(opcode_) \
+ .opcode = opcode_, .length = 4, \
+ .registerIndex = offsetof(struct i2c_hid_desc, wCommandRegister)
+
+ /* fetch HID descriptor */
+ static const struct i2c_hid_cmd hid_descr_cmd = { .length = 2 };
+ /* fetch report descriptors */
+ static const struct i2c_hid_cmd hid_report_descr_cmd = {
+ .registerIndex = offsetof(struct i2c_hid_desc,
+ wReportDescRegister),
+ .opcode = 0x00,
+ .length = 2 };
+ /* commands */
+ static const struct i2c_hid_cmd hid_reset_cmd = { I2C_HID_CMD(0x01),
+ .wait = true };
+ static const struct i2c_hid_cmd hid_get_report_cmd = { I2C_HID_CMD(0x02) };
+ static const struct i2c_hid_cmd hid_set_report_cmd = { I2C_HID_CMD(0x03) };
+ static const struct i2c_hid_cmd hid_set_power_cmd = { I2C_HID_CMD(0x08) };
+ static const struct i2c_hid_cmd hid_no_cmd = { .length = 0 };
+
+ /*
+ * These definitions are not used here, but are defined by the spec.
+ * Keeping them here for documentation purposes.
+ *
+ * static const struct i2c_hid_cmd hid_get_idle_cmd = { I2C_HID_CMD(0x04) };
+ * static const struct i2c_hid_cmd hid_set_idle_cmd = { I2C_HID_CMD(0x05) };
+ * static const struct i2c_hid_cmd hid_get_protocol_cmd = { I2C_HID_CMD(0x06) };
+ * static const struct i2c_hid_cmd hid_set_protocol_cmd = { I2C_HID_CMD(0x07) };
+ */
+
+ /* The main device structure */
+ struct i2c_hid {
+ struct i2c_client *client; /* i2c client */
+ struct hid_device *hid; /* pointer to corresponding HID dev */
+ union {
+ __u8 hdesc_buffer[sizeof(struct i2c_hid_desc)];
+ struct i2c_hid_desc hdesc; /* the HID Descriptor */
+ };
+ __le16 wHIDDescRegister; /* location of the i2c
+ * register of the HID
+ * descriptor. */
+ unsigned int bufsize; /* i2c buffer size */
+ u8 *inbuf; /* Input buffer */
+ u8 *rawbuf; /* Raw Input buffer */
+ u8 *cmdbuf; /* Command buffer */
+ u8 *argsbuf; /* Command arguments buffer */
+
+ unsigned long flags; /* device flags */
+ unsigned long quirks; /* Various quirks */
+
+ wait_queue_head_t wait; /* For waiting the interrupt */
+
+ struct i2c_hid_platform_data pdata;
+
+ bool irq_wake_enabled;
+ struct mutex reset_lock;
+ };
+
+ static const struct i2c_hid_quirks {
+ __u16 idVendor;
+ __u16 idProduct;
+ __u32 quirks;
+ } i2c_hid_quirks[] = {
+ { USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8752,
+ I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
+ { USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8755,
+ I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
+ { I2C_VENDOR_ID_HANTICK, I2C_PRODUCT_ID_HANTICK_5288,
- pm_runtime_put(&client->dev);
++ I2C_HID_QUIRK_NO_IRQ_AFTER_RESET |
++ I2C_HID_QUIRK_NO_RUNTIME_PM },
+ { 0, 0 }
+ };
+
+ /*
+ * i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device
+ * @idVendor: the 16-bit vendor ID
+ * @idProduct: the 16-bit product ID
+ *
+ * Returns: a u32 quirks value.
+ */
+ static u32 i2c_hid_lookup_quirk(const u16 idVendor, const u16 idProduct)
+ {
+ u32 quirks = 0;
+ int n;
+
+ for (n = 0; i2c_hid_quirks[n].idVendor; n++)
+ if (i2c_hid_quirks[n].idVendor == idVendor &&
+ (i2c_hid_quirks[n].idProduct == (__u16)HID_ANY_ID ||
+ i2c_hid_quirks[n].idProduct == idProduct))
+ quirks = i2c_hid_quirks[n].quirks;
+
+ return quirks;
+ }
+
+ static int __i2c_hid_command(struct i2c_client *client,
+ const struct i2c_hid_cmd *command, u8 reportID,
+ u8 reportType, u8 *args, int args_len,
+ unsigned char *buf_recv, int data_len)
+ {
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ union command *cmd = (union command *)ihid->cmdbuf;
+ int ret;
+ struct i2c_msg msg[2];
+ int msg_num = 1;
+
+ int length = command->length;
+ bool wait = command->wait;
+ unsigned int registerIndex = command->registerIndex;
+
+ /* special case for hid_descr_cmd */
+ if (command == &hid_descr_cmd) {
+ cmd->c.reg = ihid->wHIDDescRegister;
+ } else {
+ cmd->data[0] = ihid->hdesc_buffer[registerIndex];
+ cmd->data[1] = ihid->hdesc_buffer[registerIndex + 1];
+ }
+
+ if (length > 2) {
+ cmd->c.opcode = command->opcode;
+ cmd->c.reportTypeID = reportID | reportType << 4;
+ }
+
+ memcpy(cmd->data + length, args, args_len);
+ length += args_len;
+
+ i2c_hid_dbg(ihid, "%s: cmd=%*ph\n", __func__, length, cmd->data);
+
+ msg[0].addr = client->addr;
+ msg[0].flags = client->flags & I2C_M_TEN;
+ msg[0].len = length;
+ msg[0].buf = cmd->data;
+ if (data_len > 0) {
+ msg[1].addr = client->addr;
+ msg[1].flags = client->flags & I2C_M_TEN;
+ msg[1].flags |= I2C_M_RD;
+ msg[1].len = data_len;
+ msg[1].buf = buf_recv;
+ msg_num = 2;
+ set_bit(I2C_HID_READ_PENDING, &ihid->flags);
+ }
+
+ if (wait)
+ set_bit(I2C_HID_RESET_PENDING, &ihid->flags);
+
+ ret = i2c_transfer(client->adapter, msg, msg_num);
+
+ if (data_len > 0)
+ clear_bit(I2C_HID_READ_PENDING, &ihid->flags);
+
+ if (ret != msg_num)
+ return ret < 0 ? ret : -EIO;
+
+ ret = 0;
+
+ if (wait && (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET)) {
+ msleep(100);
+ } else if (wait) {
+ 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;
+ i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
+ }
+
+ return ret;
+ }
+
+ static int i2c_hid_command(struct i2c_client *client,
+ const struct i2c_hid_cmd *command,
+ unsigned char *buf_recv, int data_len)
+ {
+ return __i2c_hid_command(client, command, 0, 0, NULL, 0,
+ buf_recv, data_len);
+ }
+
+ static int i2c_hid_get_report(struct i2c_client *client, u8 reportType,
+ u8 reportID, unsigned char *buf_recv, int data_len)
+ {
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ u8 args[3];
+ int ret;
+ int args_len = 0;
+ u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
+
+ i2c_hid_dbg(ihid, "%s\n", __func__);
+
+ if (reportID >= 0x0F) {
+ args[args_len++] = reportID;
+ reportID = 0x0F;
+ }
+
+ args[args_len++] = readRegister & 0xFF;
+ args[args_len++] = readRegister >> 8;
+
+ ret = __i2c_hid_command(client, &hid_get_report_cmd, reportID,
+ reportType, args, args_len, buf_recv, data_len);
+ if (ret) {
+ dev_err(&client->dev,
+ "failed to retrieve report from device.\n");
+ return ret;
+ }
+
+ return 0;
+ }
+
+ /**
+ * i2c_hid_set_or_send_report: forward an incoming report to the device
+ * @client: the i2c_client of the device
+ * @reportType: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT
+ * @reportID: the report ID
+ * @buf: the actual data to transfer, without the report ID
+ * @len: size of buf
+ * @use_data: true: use SET_REPORT HID command, false: send plain OUTPUT report
+ */
+ static int i2c_hid_set_or_send_report(struct i2c_client *client, u8 reportType,
+ u8 reportID, unsigned char *buf, size_t data_len, bool use_data)
+ {
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ u8 *args = ihid->argsbuf;
+ const struct i2c_hid_cmd *hidcmd;
+ int ret;
+ u16 dataRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
+ u16 outputRegister = le16_to_cpu(ihid->hdesc.wOutputRegister);
+ u16 maxOutputLength = le16_to_cpu(ihid->hdesc.wMaxOutputLength);
+ u16 size;
+ int args_len;
+ int index = 0;
+
+ i2c_hid_dbg(ihid, "%s\n", __func__);
+
+ if (data_len > ihid->bufsize)
+ return -EINVAL;
+
+ size = 2 /* size */ +
+ (reportID ? 1 : 0) /* reportID */ +
+ data_len /* buf */;
+ args_len = (reportID >= 0x0F ? 1 : 0) /* optional third byte */ +
+ 2 /* dataRegister */ +
+ size /* args */;
+
+ if (!use_data && maxOutputLength == 0)
+ return -ENOSYS;
+
+ if (reportID >= 0x0F) {
+ args[index++] = reportID;
+ reportID = 0x0F;
+ }
+
+ /*
+ * use the data register for feature reports or if the device does not
+ * support the output register
+ */
+ if (use_data) {
+ args[index++] = dataRegister & 0xFF;
+ args[index++] = dataRegister >> 8;
+ hidcmd = &hid_set_report_cmd;
+ } else {
+ args[index++] = outputRegister & 0xFF;
+ args[index++] = outputRegister >> 8;
+ hidcmd = &hid_no_cmd;
+ }
+
+ args[index++] = size & 0xFF;
+ args[index++] = size >> 8;
+
+ if (reportID)
+ args[index++] = reportID;
+
+ memcpy(&args[index], buf, data_len);
+
+ ret = __i2c_hid_command(client, hidcmd, reportID,
+ reportType, args, args_len, NULL, 0);
+ if (ret) {
+ dev_err(&client->dev, "failed to set a report to device.\n");
+ return ret;
+ }
+
+ return data_len;
+ }
+
+ static int i2c_hid_set_power(struct i2c_client *client, int power_state)
+ {
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ int ret;
+
+ i2c_hid_dbg(ihid, "%s\n", __func__);
+
+ /*
+ * Some devices require to send a command to wakeup before power on.
+ * 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) {
+ ret = i2c_hid_command(client, &hid_set_power_cmd, NULL, 0);
+
+ /* Device was already activated */
+ if (!ret)
+ goto set_pwr_exit;
+ }
+
+ ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state,
+ 0, NULL, 0, NULL, 0);
+
+ if (ret)
+ dev_err(&client->dev, "failed to change power setting.\n");
+
+ set_pwr_exit:
+ return ret;
+ }
+
+ static int i2c_hid_hwreset(struct i2c_client *client)
+ {
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ int ret;
+
+ 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.
+ */
+ mutex_lock(&ihid->reset_lock);
+
+ ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
+ if (ret)
+ goto out_unlock;
+
+ /*
+ * The HID over I2C specification states that if a DEVICE needs time
+ * after the PWR_ON request, it should utilise CLOCK stretching.
+ * However, it has been observered that the Windows driver provides a
+ * 1ms sleep between the PWR_ON and RESET requests and that some devices
+ * rely on this.
+ */
+ usleep_range(1000, 5000);
+
+ i2c_hid_dbg(ihid, "resetting...\n");
+
+ ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0);
+ if (ret) {
+ dev_err(&client->dev, "failed to reset device.\n");
+ i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
+ }
+
+ out_unlock:
+ mutex_unlock(&ihid->reset_lock);
+ return ret;
+ }
+
+ static void i2c_hid_get_input(struct i2c_hid *ihid)
+ {
+ int ret;
+ u32 ret_size;
+ int size = le16_to_cpu(ihid->hdesc.wMaxInputLength);
+
+ if (size > ihid->bufsize)
+ size = ihid->bufsize;
+
+ ret = i2c_master_recv(ihid->client, ihid->inbuf, size);
+ if (ret != size) {
+ if (ret < 0)
+ return;
+
+ dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n",
+ __func__, ret, size);
+ return;
+ }
+
+ ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8;
+
+ if (!ret_size) {
+ /* host or device initiated RESET completed */
+ if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags))
+ wake_up(&ihid->wait);
+ return;
+ }
+
+ if ((ret_size > size) || (ret_size < 2)) {
+ dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n",
+ __func__, size, ret_size);
+ return;
+ }
+
+ i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf);
+
+ if (test_bit(I2C_HID_STARTED, &ihid->flags))
+ hid_input_report(ihid->hid, HID_INPUT_REPORT, ihid->inbuf + 2,
+ ret_size - 2, 1);
+
+ return;
+ }
+
+ static irqreturn_t i2c_hid_irq(int irq, void *dev_id)
+ {
+ struct i2c_hid *ihid = dev_id;
+
+ if (test_bit(I2C_HID_READ_PENDING, &ihid->flags))
+ return IRQ_HANDLED;
+
+ i2c_hid_get_input(ihid);
+
+ return IRQ_HANDLED;
+ }
+
+ static int i2c_hid_get_report_length(struct hid_report *report)
+ {
+ return ((report->size - 1) >> 3) + 1 +
+ report->device->report_enum[report->type].numbered + 2;
+ }
+
+ /*
+ * Traverse the supplied list of reports and find the longest
+ */
+ static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
+ unsigned int *max)
+ {
+ struct hid_report *report;
+ unsigned int size;
+
+ /* We should not rely on wMaxInputLength, as some devices may set it to
+ * a wrong length. */
+ list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
+ size = i2c_hid_get_report_length(report);
+ if (*max < size)
+ *max = size;
+ }
+ }
+
+ static void i2c_hid_free_buffers(struct i2c_hid *ihid)
+ {
+ kfree(ihid->inbuf);
+ kfree(ihid->rawbuf);
+ kfree(ihid->argsbuf);
+ kfree(ihid->cmdbuf);
+ ihid->inbuf = NULL;
+ ihid->rawbuf = NULL;
+ ihid->cmdbuf = NULL;
+ ihid->argsbuf = NULL;
+ ihid->bufsize = 0;
+ }
+
+ static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
+ {
+ /* the worst case is computed from the set_report command with a
+ * reportID > 15 and the maximum report length */
+ int args_len = sizeof(__u8) + /* ReportID */
+ sizeof(__u8) + /* optional ReportID byte */
+ sizeof(__u16) + /* data register */
+ sizeof(__u16) + /* size of the report */
+ report_size; /* report */
+
+ ihid->inbuf = kzalloc(report_size, GFP_KERNEL);
+ ihid->rawbuf = kzalloc(report_size, GFP_KERNEL);
+ ihid->argsbuf = kzalloc(args_len, GFP_KERNEL);
+ ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL);
+
+ if (!ihid->inbuf || !ihid->rawbuf || !ihid->argsbuf || !ihid->cmdbuf) {
+ i2c_hid_free_buffers(ihid);
+ return -ENOMEM;
+ }
+
+ ihid->bufsize = report_size;
+
+ return 0;
+ }
+
+ static int i2c_hid_get_raw_report(struct hid_device *hid,
+ unsigned char report_number, __u8 *buf, size_t count,
+ unsigned char report_type)
+ {
+ struct i2c_client *client = hid->driver_data;
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ size_t ret_count, ask_count;
+ int ret;
+
+ if (report_type == HID_OUTPUT_REPORT)
+ return -EINVAL;
+
+ /* +2 bytes to include the size of the reply in the query buffer */
+ ask_count = min(count + 2, (size_t)ihid->bufsize);
+
+ ret = i2c_hid_get_report(client,
+ report_type == HID_FEATURE_REPORT ? 0x03 : 0x01,
+ report_number, ihid->rawbuf, ask_count);
+
+ if (ret < 0)
+ return ret;
+
+ ret_count = ihid->rawbuf[0] | (ihid->rawbuf[1] << 8);
+
+ if (ret_count <= 2)
+ return 0;
+
+ ret_count = min(ret_count, ask_count);
+
+ /* The query buffer contains the size, dropping it in the reply */
+ count = min(count, ret_count - 2);
+ memcpy(buf, ihid->rawbuf + 2, count);
+
+ return count;
+ }
+
+ static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf,
+ size_t count, unsigned char report_type, bool use_data)
+ {
+ struct i2c_client *client = hid->driver_data;
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ int report_id = buf[0];
+ int ret;
+
+ if (report_type == HID_INPUT_REPORT)
+ return -EINVAL;
+
+ mutex_lock(&ihid->reset_lock);
+
+ if (report_id) {
+ buf++;
+ count--;
+ }
+
+ ret = i2c_hid_set_or_send_report(client,
+ report_type == HID_FEATURE_REPORT ? 0x03 : 0x02,
+ report_id, buf, count, use_data);
+
+ if (report_id && ret >= 0)
+ ret++; /* add report_id to the number of transfered bytes */
+
+ mutex_unlock(&ihid->reset_lock);
+
+ return ret;
+ }
+
+ static int i2c_hid_output_report(struct hid_device *hid, __u8 *buf,
+ size_t count)
+ {
+ return i2c_hid_output_raw_report(hid, buf, count, HID_OUTPUT_REPORT,
+ false);
+ }
+
+ static int i2c_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
+ __u8 *buf, size_t len, unsigned char rtype,
+ int reqtype)
+ {
+ switch (reqtype) {
+ case HID_REQ_GET_REPORT:
+ return i2c_hid_get_raw_report(hid, reportnum, buf, len, rtype);
+ case HID_REQ_SET_REPORT:
+ if (buf[0] != reportnum)
+ return -EINVAL;
+ return i2c_hid_output_raw_report(hid, buf, len, rtype, true);
+ default:
+ return -EIO;
+ }
+ }
+
+ 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;
+ unsigned int rsize;
+ char *rdesc;
+ int ret;
+ int tries = 3;
+ char *use_override;
+
+ i2c_hid_dbg(ihid, "entering %s\n", __func__);
+
+ rsize = le16_to_cpu(hdesc->wReportDescLength);
+ if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
+ dbg_hid("weird size of report descriptor (%u)\n", rsize);
+ return -EINVAL;
+ }
+
+ do {
+ ret = i2c_hid_hwreset(client);
+ if (ret)
+ msleep(1000);
+ } while (tries-- > 0 && ret);
+
+ if (ret)
+ return ret;
+
+ use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name,
+ &rsize);
+
+ 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);
+ 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)
+ {
+ struct i2c_client *client = hid->driver_data;
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ int ret;
+ unsigned int bufsize = HID_MIN_BUFFER_SIZE;
+
+ i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
+ i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
+ i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
+
+ if (bufsize > ihid->bufsize) {
+ disable_irq(client->irq);
+ i2c_hid_free_buffers(ihid);
+
+ ret = i2c_hid_alloc_buffers(ihid, bufsize);
+ enable_irq(client->irq);
+
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+ }
+
+ static void i2c_hid_stop(struct hid_device *hid)
+ {
+ hid->claimed = 0;
+ }
+
+ static int i2c_hid_open(struct hid_device *hid)
+ {
+ struct i2c_client *client = hid->driver_data;
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ int ret = 0;
+
+ ret = pm_runtime_get_sync(&client->dev);
+ if (ret < 0)
+ return ret;
+
+ set_bit(I2C_HID_STARTED, &ihid->flags);
+ return 0;
+ }
+
+ static void i2c_hid_close(struct hid_device *hid)
+ {
+ struct i2c_client *client = hid->driver_data;
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+
+ clear_bit(I2C_HID_STARTED, &ihid->flags);
+
+ /* Save some power */
+ pm_runtime_put(&client->dev);
+ }
+
+ static int i2c_hid_power(struct hid_device *hid, int lvl)
+ {
+ struct i2c_client *client = hid->driver_data;
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+
+ i2c_hid_dbg(ihid, "%s lvl:%d\n", __func__, lvl);
+
+ switch (lvl) {
+ case PM_HINT_FULLON:
+ pm_runtime_get_sync(&client->dev);
+ break;
+ case PM_HINT_NORMAL:
+ pm_runtime_put(&client->dev);
+ break;
+ }
+ return 0;
+ }
+
+ struct hid_ll_driver i2c_hid_ll_driver = {
+ .parse = i2c_hid_parse,
+ .start = i2c_hid_start,
+ .stop = i2c_hid_stop,
+ .open = i2c_hid_open,
+ .close = i2c_hid_close,
+ .power = i2c_hid_power,
+ .output_report = i2c_hid_output_report,
+ .raw_request = i2c_hid_raw_request,
+ };
+ EXPORT_SYMBOL_GPL(i2c_hid_ll_driver);
+
+ static int i2c_hid_init_irq(struct i2c_client *client)
+ {
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ unsigned long irqflags = 0;
+ int ret;
+
+ dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
+
+ if (!irq_get_trigger_type(client->irq))
+ irqflags = IRQF_TRIGGER_LOW;
+
+ ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
+ irqflags | IRQF_ONESHOT, client->name, ihid);
+ if (ret < 0) {
+ dev_warn(&client->dev,
+ "Could not register for %s interrupt, irq = %d,"
+ " ret = %d\n",
+ client->name, client->irq, ret);
+
+ return ret;
+ }
+
+ return 0;
+ }
+
+ static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
+ {
+ struct i2c_client *client = ihid->client;
+ struct i2c_hid_desc *hdesc = &ihid->hdesc;
+ unsigned int dsize;
+ int ret;
+
+ /* i2c hid fetch using a fixed descriptor size (30 bytes) */
+ 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:
+ * bytes 0-1 -> length
+ * bytes 2-3 -> bcdVersion (has to be 1.00) */
+ /* check bcdVersion == 1.0 */
+ if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
+ dev_err(&client->dev,
+ "unexpected HID descriptor bcdVersion (0x%04hx)\n",
+ le16_to_cpu(hdesc->bcdVersion));
+ return -ENODEV;
+ }
+
+ /* Descriptor length should be 30 bytes as per the specification */
+ dsize = le16_to_cpu(hdesc->wHIDDescLength);
+ if (dsize != sizeof(struct i2c_hid_desc)) {
+ dev_err(&client->dev, "weird size of HID descriptor (%u)\n",
+ dsize);
+ return -ENODEV;
+ }
+ i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer);
+ return 0;
+ }
+
+ #ifdef CONFIG_ACPI
+ static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
+ /*
+ * The CHPN0001 ACPI device, which is used to describe the Chipone
+ * ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
+ */
+ {"CHPN0001", 0 },
+ { },
+ };
+
+ static int i2c_hid_acpi_pdata(struct i2c_client *client,
+ struct i2c_hid_platform_data *pdata)
+ {
+ static guid_t i2c_hid_guid =
+ GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
+ 0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
+ union acpi_object *obj;
+ struct acpi_device *adev;
+ acpi_handle handle;
+
+ handle = ACPI_HANDLE(&client->dev);
+ if (!handle || acpi_bus_get_device(handle, &adev)) {
+ dev_err(&client->dev, "Error could not get ACPI device\n");
+ return -ENODEV;
+ }
+
+ if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
+ return -ENODEV;
+
+ obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
+ ACPI_TYPE_INTEGER);
+ if (!obj) {
+ dev_err(&client->dev, "Error _DSM call to get HID descriptor address failed\n");
+ return -ENODEV;
+ }
+
+ pdata->hid_descriptor_address = obj->integer.value;
+ ACPI_FREE(obj);
+
+ return 0;
+ }
+
+ static void i2c_hid_acpi_fix_up_power(struct device *dev)
+ {
+ struct acpi_device *adev;
+
+ adev = ACPI_COMPANION(dev);
+ if (adev)
+ acpi_device_fix_up_power(adev);
+ }
+
+ static const struct acpi_device_id i2c_hid_acpi_match[] = {
+ {"ACPI0C50", 0 },
+ {"PNP0C50", 0 },
+ { },
+ };
+ MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
+ #else
+ static inline int i2c_hid_acpi_pdata(struct i2c_client *client,
+ struct i2c_hid_platform_data *pdata)
+ {
+ return -ENODEV;
+ }
+
+ static inline void i2c_hid_acpi_fix_up_power(struct device *dev) {}
+ #endif
+
+ #ifdef CONFIG_OF
+ static int i2c_hid_of_probe(struct i2c_client *client,
+ struct i2c_hid_platform_data *pdata)
+ {
+ struct device *dev = &client->dev;
+ u32 val;
+ int ret;
+
+ ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
+ if (ret) {
+ dev_err(&client->dev, "HID register address not provided\n");
+ return -ENODEV;
+ }
+ if (val >> 16) {
+ dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
+ val);
+ return -EINVAL;
+ }
+ pdata->hid_descriptor_address = val;
+
+ return 0;
+ }
+
+ static const struct of_device_id i2c_hid_of_match[] = {
+ { .compatible = "hid-over-i2c" },
+ {},
+ };
+ MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
+ #else
+ static inline int i2c_hid_of_probe(struct i2c_client *client,
+ struct i2c_hid_platform_data *pdata)
+ {
+ return -ENODEV;
+ }
+ #endif
+
+ static void i2c_hid_fwnode_probe(struct i2c_client *client,
+ struct i2c_hid_platform_data *pdata)
+ {
+ u32 val;
+
+ if (!device_property_read_u32(&client->dev, "post-power-on-delay-ms",
+ &val))
+ pdata->post_power_delay_ms = val;
+ }
+
+ static int i2c_hid_probe(struct i2c_client *client,
+ const struct i2c_device_id *dev_id)
+ {
+ int ret;
+ struct i2c_hid *ihid;
+ struct hid_device *hid;
+ __u16 hidRegister;
+ struct i2c_hid_platform_data *platform_data = client->dev.platform_data;
+
+ dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
+
+ if (!client->irq) {
+ dev_err(&client->dev,
+ "HID over i2c has not been provided an Int IRQ\n");
+ return -EINVAL;
+ }
+
+ if (client->irq < 0) {
+ if (client->irq != -EPROBE_DEFER)
+ dev_err(&client->dev,
+ "HID over i2c doesn't have a valid IRQ\n");
+ return client->irq;
+ }
+
+ ihid = devm_kzalloc(&client->dev, sizeof(*ihid), GFP_KERNEL);
+ if (!ihid)
+ return -ENOMEM;
+
+ if (client->dev.of_node) {
+ ret = i2c_hid_of_probe(client, &ihid->pdata);
+ if (ret)
+ return ret;
+ } else if (!platform_data) {
+ ret = i2c_hid_acpi_pdata(client, &ihid->pdata);
+ if (ret)
+ return ret;
+ } else {
+ ihid->pdata = *platform_data;
+ }
+
+ /* Parse platform agnostic common properties from ACPI / device tree */
+ i2c_hid_fwnode_probe(client, &ihid->pdata);
+
+ ihid->pdata.supplies[0].supply = "vdd";
+ ihid->pdata.supplies[1].supply = "vddl";
+
+ ret = devm_regulator_bulk_get(&client->dev,
+ ARRAY_SIZE(ihid->pdata.supplies),
+ ihid->pdata.supplies);
+ if (ret)
+ return ret;
+
+ ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
+ ihid->pdata.supplies);
+ if (ret < 0)
+ return ret;
+
+ if (ihid->pdata.post_power_delay_ms)
+ msleep(ihid->pdata.post_power_delay_ms);
+
+ i2c_set_clientdata(client, ihid);
+
+ ihid->client = client;
+
+ hidRegister = ihid->pdata.hid_descriptor_address;
+ ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
+
+ init_waitqueue_head(&ihid->wait);
+ mutex_init(&ihid->reset_lock);
+
+ /* we need to allocate the command buffer without knowing the maximum
+ * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
+ * real computation later. */
+ ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
+ if (ret < 0)
+ goto err_regulator;
+
+ i2c_hid_acpi_fix_up_power(&client->dev);
+
+ pm_runtime_get_noresume(&client->dev);
+ pm_runtime_set_active(&client->dev);
+ pm_runtime_enable(&client->dev);
+ device_enable_async_suspend(&client->dev);
+
+ /* Make sure there is something at this address */
+ ret = i2c_smbus_read_byte(client);
+ if (ret < 0) {
+ dev_dbg(&client->dev, "nothing at this address: %d\n", ret);
+ ret = -ENXIO;
+ goto err_pm;
+ }
+
+ ret = i2c_hid_fetch_hid_descriptor(ihid);
+ if (ret < 0)
+ goto err_pm;
+
+ ret = i2c_hid_init_irq(client);
+ if (ret < 0)
+ goto err_pm;
+
+ hid = hid_allocate_device();
+ if (IS_ERR(hid)) {
+ ret = PTR_ERR(hid);
+ goto err_irq;
+ }
+
+ ihid->hid = hid;
+
+ hid->driver_data = client;
+ hid->ll_driver = &i2c_hid_ll_driver;
+ hid->dev.parent = &client->dev;
+ hid->bus = BUS_I2C;
+ hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
+ hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
+ hid->product = le16_to_cpu(ihid->hdesc.wProductID);
+
+ snprintf(hid->name, sizeof(hid->name), "%s %04hX:%04hX",
+ client->name, hid->vendor, hid->product);
+ strlcpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
+
+ ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
+
+ ret = hid_add_device(hid);
+ if (ret) {
+ if (ret != -ENODEV)
+ hid_err(client, "can't add hid device: %d\n", ret);
+ goto err_mem_free;
+ }
+
- pm_runtime_get_sync(&client->dev);
++ if (!(ihid->quirks & I2C_HID_QUIRK_NO_RUNTIME_PM))
++ pm_runtime_put(&client->dev);
++
+ return 0;
+
+ err_mem_free:
+ hid_destroy_device(hid);
+
+ err_irq:
+ free_irq(client->irq, ihid);
+
+ err_pm:
+ pm_runtime_put_noidle(&client->dev);
+ pm_runtime_disable(&client->dev);
+
+ err_regulator:
+ regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
+ ihid->pdata.supplies);
+ i2c_hid_free_buffers(ihid);
+ return ret;
+ }
+
+ static int i2c_hid_remove(struct i2c_client *client)
+ {
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ struct hid_device *hid;
+
- * 2386:4B33
++ if (!(ihid->quirks & I2C_HID_QUIRK_NO_RUNTIME_PM))
++ pm_runtime_get_sync(&client->dev);
+ pm_runtime_disable(&client->dev);
+ pm_runtime_set_suspended(&client->dev);
+ pm_runtime_put_noidle(&client->dev);
+
+ hid = ihid->hid;
+ hid_destroy_device(hid);
+
+ free_irq(client->irq, ihid);
+
+ if (ihid->bufsize)
+ i2c_hid_free_buffers(ihid);
+
+ regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
+ ihid->pdata.supplies);
+
+ return 0;
+ }
+
+ static void i2c_hid_shutdown(struct i2c_client *client)
+ {
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+
+ i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
+ free_irq(client->irq, ihid);
+ }
+
+ #ifdef CONFIG_PM_SLEEP
+ static int i2c_hid_suspend(struct device *dev)
+ {
+ struct i2c_client *client = to_i2c_client(dev);
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ struct hid_device *hid = ihid->hid;
+ int ret;
+ int wake_status;
+
+ if (hid->driver && hid->driver->suspend) {
+ /*
+ * Wake up the device so that IO issues in
+ * HID driver's suspend code can succeed.
+ */
+ ret = pm_runtime_resume(dev);
+ if (ret < 0)
+ return ret;
+
+ ret = hid->driver->suspend(hid, PMSG_SUSPEND);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (!pm_runtime_suspended(dev)) {
+ /* Save some power */
+ i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
+
+ disable_irq(client->irq);
+ }
+
+ if (device_may_wakeup(&client->dev)) {
+ wake_status = enable_irq_wake(client->irq);
+ if (!wake_status)
+ ihid->irq_wake_enabled = true;
+ else
+ hid_warn(hid, "Failed to enable irq wake: %d\n",
+ wake_status);
+ } else {
+ regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
+ ihid->pdata.supplies);
+ }
+
+ return 0;
+ }
+
+ static int i2c_hid_resume(struct device *dev)
+ {
+ int ret;
+ struct i2c_client *client = to_i2c_client(dev);
+ struct i2c_hid *ihid = i2c_get_clientdata(client);
+ struct hid_device *hid = ihid->hid;
+ int wake_status;
+
+ if (!device_may_wakeup(&client->dev)) {
+ ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
+ ihid->pdata.supplies);
+ if (ret)
+ hid_warn(hid, "Failed to enable supplies: %d\n", ret);
+
+ if (ihid->pdata.post_power_delay_ms)
+ msleep(ihid->pdata.post_power_delay_ms);
+ } else if (ihid->irq_wake_enabled) {
+ wake_status = disable_irq_wake(client->irq);
+ if (!wake_status)
+ ihid->irq_wake_enabled = false;
+ else
+ hid_warn(hid, "Failed to disable irq wake: %d\n",
+ wake_status);
+ }
+
+ /* We'll resume to full power */
+ pm_runtime_disable(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+
+ enable_irq(client->irq);
+
+ /* Instead of resetting device, simply powers the device on. This
+ * solves "incomplete reports" on Raydium devices 2386:3118 and
- /* Some devices need to re-send report descr cmd
- * after resume, after this it will be back normal.
- * otherwise it issues too many incomplete reports.
- */
- if (ihid->quirks & I2C_HID_QUIRK_RESEND_REPORT_DESCR) {
- ret = i2c_hid_command(client, &hid_report_descr_cmd, NULL, 0);
- if (ret)
- return ret;
- }
-
++ * 2386:4B33 and fixes various SIS touchscreens no longer sending
++ * data after a suspend/resume.
+ */
+ ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
+ if (ret)
+ return ret;
+
+ if (hid->driver && hid->driver->reset_resume) {
+ ret = hid->driver->reset_resume(hid);
+ return ret;
+ }
+
+ return 0;
+ }
+ #endif
+
+ #ifdef CONFIG_PM
+ static int i2c_hid_runtime_suspend(struct device *dev)
+ {
+ struct i2c_client *client = to_i2c_client(dev);
+
+ i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
+ disable_irq(client->irq);
+ return 0;
+ }
+
+ static int i2c_hid_runtime_resume(struct device *dev)
+ {
+ struct i2c_client *client = to_i2c_client(dev);
+
+ enable_irq(client->irq);
+ i2c_hid_set_power(client, I2C_HID_PWR_ON);
+ return 0;
+ }
+ #endif
+
+ static const struct dev_pm_ops i2c_hid_pm = {
+ SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_suspend, i2c_hid_resume)
+ SET_RUNTIME_PM_OPS(i2c_hid_runtime_suspend, i2c_hid_runtime_resume,
+ NULL)
+ };
+
+ static const struct i2c_device_id i2c_hid_id_table[] = {
+ { "hid", 0 },
+ { "hid-over-i2c", 0 },
+ { },
+ };
+ MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table);
+
+
+ static struct i2c_driver i2c_hid_driver = {
+ .driver = {
+ .name = "i2c_hid",
+ .pm = &i2c_hid_pm,
+ .acpi_match_table = ACPI_PTR(i2c_hid_acpi_match),
+ .of_match_table = of_match_ptr(i2c_hid_of_match),
+ },
+
+ .probe = i2c_hid_probe,
+ .remove = i2c_hid_remove,
+ .shutdown = i2c_hid_shutdown,
+ .id_table = i2c_hid_id_table,
+ };
+
+ module_i2c_driver(i2c_hid_driver);
+
+ MODULE_DESCRIPTION("HID over I2C core driver");
+ MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
+ MODULE_LICENSE("GPL");
projects / platform / kernel / linux-starfive.git / commitdiff