diff options
Diffstat (limited to 'drivers/hid/i2c-hid/i2c-hid.c')
-rw-r--r-- | drivers/hid/i2c-hid/i2c-hid.c | 263 |
1 files changed, 146 insertions, 117 deletions
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c index 2e021ba..8daa8ce 100644 --- a/drivers/hid/i2c-hid/i2c-hid.c +++ b/drivers/hid/i2c-hid/i2c-hid.c @@ -22,6 +22,7 @@ #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> @@ -37,10 +38,15 @@ #include <linux/mutex.h> #include <linux/acpi.h> #include <linux/of.h> -#include <linux/gpio/consumer.h> +#include <linux/regulator/consumer.h> #include <linux/i2c/i2c-hid.h> +#include "../hid-ids.h" + +/* quirks to control the device */ +#define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV BIT(0) + /* flags */ #define I2C_HID_STARTED 0 #define I2C_HID_RESET_PENDING 1 @@ -143,10 +149,9 @@ struct i2c_hid { char *argsbuf; /* Command arguments buffer */ unsigned long flags; /* device flags */ + unsigned long quirks; /* Various quirks */ wait_queue_head_t wait; /* For waiting the interrupt */ - struct gpio_desc *desc; - int irq; struct i2c_hid_platform_data pdata; @@ -154,6 +159,39 @@ struct i2c_hid { 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 }, + { 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, @@ -346,11 +384,27 @@ static int i2c_hid_set_power(struct i2c_client *client, int power_state) 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; } @@ -372,6 +426,15 @@ static int i2c_hid_hwreset(struct i2c_client *client) 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); @@ -445,66 +508,6 @@ static int i2c_hid_get_report_length(struct hid_report *report) report->device->report_enum[report->type].numbered + 2; } -static void i2c_hid_init_report(struct hid_report *report, u8 *buffer, - size_t bufsize) -{ - struct hid_device *hid = report->device; - struct i2c_client *client = hid->driver_data; - struct i2c_hid *ihid = i2c_get_clientdata(client); - unsigned int size, ret_size; - - size = i2c_hid_get_report_length(report); - if (i2c_hid_get_report(client, - report->type == HID_FEATURE_REPORT ? 0x03 : 0x01, - report->id, buffer, size)) - return; - - i2c_hid_dbg(ihid, "report (len=%d): %*ph\n", size, size, buffer); - - ret_size = buffer[0] | (buffer[1] << 8); - - if (ret_size != size) { - dev_err(&client->dev, "error in %s size:%d / ret_size:%d\n", - __func__, size, ret_size); - return; - } - - /* hid->driver_lock is held as we are in probe function, - * we just need to setup the input fields, so using - * hid_report_raw_event is safe. */ - hid_report_raw_event(hid, report->type, buffer + 2, size - 2, 1); -} - -/* - * Initialize all reports - */ -static void i2c_hid_init_reports(struct hid_device *hid) -{ - struct hid_report *report; - struct i2c_client *client = hid->driver_data; - struct i2c_hid *ihid = i2c_get_clientdata(client); - u8 *inbuf = kzalloc(ihid->bufsize, GFP_KERNEL); - - if (!inbuf) { - dev_err(&client->dev, "can not retrieve initial reports\n"); - return; - } - - /* - * The device must be powered on while we fetch initial reports - * from it. - */ - pm_runtime_get_sync(&client->dev); - - list_for_each_entry(report, - &hid->report_enum[HID_FEATURE_REPORT].report_list, list) - i2c_hid_init_report(report, inbuf, ihid->bufsize); - - pm_runtime_put(&client->dev); - - kfree(inbuf); -} - /* * Traverse the supplied list of reports and find the longest */ @@ -716,17 +719,16 @@ static int i2c_hid_start(struct hid_device *hid) 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; } - if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS)) - i2c_hid_init_reports(hid); - return 0; } @@ -806,18 +808,21 @@ static struct hid_ll_driver 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", ihid->irq); + 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(ihid->irq, NULL, i2c_hid_irq, - IRQF_TRIGGER_LOW | IRQF_ONESHOT, - client->name, ihid); + 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, ihid->irq, ret); + client->name, client->irq, ret); return ret; } @@ -864,14 +869,6 @@ static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid) } #ifdef CONFIG_ACPI - -/* Default GPIO mapping */ -static const struct acpi_gpio_params i2c_hid_irq_gpio = { 0, 0, true }; -static const struct acpi_gpio_mapping i2c_hid_acpi_gpios[] = { - { "gpios", &i2c_hid_irq_gpio, 1 }, - { }, -}; - static int i2c_hid_acpi_pdata(struct i2c_client *client, struct i2c_hid_platform_data *pdata) { @@ -882,7 +879,6 @@ static int i2c_hid_acpi_pdata(struct i2c_client *client, union acpi_object *obj; struct acpi_device *adev; acpi_handle handle; - int ret; handle = ACPI_HANDLE(&client->dev); if (!handle || acpi_bus_get_device(handle, &adev)) @@ -898,9 +894,7 @@ static int i2c_hid_acpi_pdata(struct i2c_client *client, pdata->hid_descriptor_address = obj->integer.value; ACPI_FREE(obj); - /* GPIOs are optional */ - ret = acpi_dev_add_driver_gpios(adev, i2c_hid_acpi_gpios); - return ret < 0 && ret != -ENXIO ? ret : 0; + return 0; } static const struct acpi_device_id i2c_hid_acpi_match[] = { @@ -937,6 +931,11 @@ static int i2c_hid_of_probe(struct i2c_client *client, } pdata->hid_descriptor_address = val; + ret = of_property_read_u32(dev->of_node, "post-power-on-delay-ms", + &val); + if (!ret) + pdata->post_power_delay_ms = val; + return 0; } @@ -964,6 +963,19 @@ static int i2c_hid_probe(struct i2c_client *client, 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 = kzalloc(sizeof(struct i2c_hid), GFP_KERNEL); if (!ihid) return -ENOMEM; @@ -983,22 +995,23 @@ static int i2c_hid_probe(struct i2c_client *client, ihid->pdata = *platform_data; } - if (client->irq > 0) { - ihid->irq = client->irq; - } else if (ACPI_COMPANION(&client->dev)) { - ihid->desc = gpiod_get(&client->dev, NULL, GPIOD_IN); - if (IS_ERR(ihid->desc)) { - dev_err(&client->dev, "Failed to get GPIO interrupt\n"); - return PTR_ERR(ihid->desc); - } + ihid->pdata.supply = devm_regulator_get(&client->dev, "vdd"); + if (IS_ERR(ihid->pdata.supply)) { + ret = PTR_ERR(ihid->pdata.supply); + if (ret != -EPROBE_DEFER) + dev_err(&client->dev, "Failed to get regulator: %d\n", + ret); + goto err; + } - ihid->irq = gpiod_to_irq(ihid->desc); - if (ihid->irq < 0) { - gpiod_put(ihid->desc); - dev_err(&client->dev, "Failed to convert GPIO to IRQ\n"); - return ihid->irq; - } + ret = regulator_enable(ihid->pdata.supply); + if (ret < 0) { + dev_err(&client->dev, "Failed to enable regulator: %d\n", + ret); + goto err; } + if (ihid->pdata.post_power_delay_ms) + msleep(ihid->pdata.post_power_delay_ms); i2c_set_clientdata(client, ihid); @@ -1015,11 +1028,12 @@ static int i2c_hid_probe(struct i2c_client *client, * real computation later. */ ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE); if (ret < 0) - goto err; + goto err_regulator; pm_runtime_get_noresume(&client->dev); pm_runtime_set_active(&client->dev); pm_runtime_enable(&client->dev); + device_enable_async_suspend(&client->dev); ret = i2c_hid_fetch_hid_descriptor(ihid); if (ret < 0) @@ -1049,6 +1063,8 @@ static int i2c_hid_probe(struct i2c_client *client, 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) @@ -1063,16 +1079,16 @@ err_mem_free: hid_destroy_device(hid); err_irq: - free_irq(ihid->irq, ihid); + free_irq(client->irq, ihid); err_pm: pm_runtime_put_noidle(&client->dev); pm_runtime_disable(&client->dev); -err: - if (ihid->desc) - gpiod_put(ihid->desc); +err_regulator: + regulator_disable(ihid->pdata.supply); +err: i2c_hid_free_buffers(ihid); kfree(ihid); return ret; @@ -1091,21 +1107,26 @@ static int i2c_hid_remove(struct i2c_client *client) hid = ihid->hid; hid_destroy_device(hid); - free_irq(ihid->irq, ihid); + free_irq(client->irq, ihid); if (ihid->bufsize) i2c_hid_free_buffers(ihid); - if (ihid->desc) - gpiod_put(ihid->desc); + regulator_disable(ihid->pdata.supply); kfree(ihid); - acpi_dev_remove_driver_gpios(ACPI_COMPANION(&client->dev)); - 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) { @@ -1133,16 +1154,20 @@ static int i2c_hid_suspend(struct device *dev) /* Save some power */ i2c_hid_set_power(client, I2C_HID_PWR_SLEEP); - disable_irq(ihid->irq); + disable_irq(client->irq); } if (device_may_wakeup(&client->dev)) { - wake_status = enable_irq_wake(ihid->irq); + 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 { + ret = regulator_disable(ihid->pdata.supply); + if (ret < 0) + hid_warn(hid, "Failed to disable supply: %d\n", ret); } return 0; @@ -1156,8 +1181,14 @@ static int i2c_hid_resume(struct device *dev) struct hid_device *hid = ihid->hid; int wake_status; - if (device_may_wakeup(&client->dev) && ihid->irq_wake_enabled) { - wake_status = disable_irq_wake(ihid->irq); + if (!device_may_wakeup(&client->dev)) { + ret = regulator_enable(ihid->pdata.supply); + if (ret < 0) + hid_warn(hid, "Failed to enable supply: %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 @@ -1170,7 +1201,7 @@ static int i2c_hid_resume(struct device *dev) pm_runtime_set_active(dev); pm_runtime_enable(dev); - enable_irq(ihid->irq); + enable_irq(client->irq); ret = i2c_hid_hwreset(client); if (ret) return ret; @@ -1188,19 +1219,17 @@ static int i2c_hid_resume(struct device *dev) static int i2c_hid_runtime_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); - struct i2c_hid *ihid = i2c_get_clientdata(client); i2c_hid_set_power(client, I2C_HID_PWR_SLEEP); - disable_irq(ihid->irq); + disable_irq(client->irq); return 0; } static int i2c_hid_runtime_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); - struct i2c_hid *ihid = i2c_get_clientdata(client); - enable_irq(ihid->irq); + enable_irq(client->irq); i2c_hid_set_power(client, I2C_HID_PWR_ON); return 0; } @@ -1230,7 +1259,7 @@ static struct i2c_driver i2c_hid_driver = { .probe = i2c_hid_probe, .remove = i2c_hid_remove, - + .shutdown = i2c_hid_shutdown, .id_table = i2c_hid_id_table, }; |