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HID: i2c-hid: add a simple quirk to fix device defects 

Certain devices produced by Weida Tech need to have a wakeup command sent to
them before powering on. The call itself will come back with error, but the
device can be powered on afterwards.

[jkosina@suse.cz: rewrite changelog]
[jkosina@suse.cz: remove unused device ID addition]
Signed-off-by: HungNien Chen <hn.chen@weidahitech.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
HungNien Chen 2016-11-10 11:47:13 +08:00 committed by Jiri Kosina
parent 93d26aeab5
commit 71af01a8c8
2 changed files with 61 additions and 0 deletions
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4
drivers/hid/hid-ids.h
View File

@ -1030,6 +1030,10 @@
#define USB_DEVICE_ID_WALTOP_MEDIA_TABLET_14_1_INCH 0x0500
#define USB_DEVICE_ID_WALTOP_SIRIUS_BATTERY_FREE_TABLET 0x0502
#define USB_VENDOR_ID_WEIDA 0x2575
#define USB_DEVICE_ID_WEIDA_8752 0xC300
#define USB_DEVICE_ID_WEIDA_8755 0xC301
#define USB_VENDOR_ID_WISEGROUP 0x0925
#define USB_DEVICE_ID_SMARTJOY_PLUS 0x0005
#define USB_DEVICE_ID_SUPER_JOY_BOX_3 0x8888

57
drivers/hid/i2c-hid/i2c-hid.c
View File

@ -40,6 +40,11 @@
#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
@ -142,6 +147,7 @@ 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 */
@ -151,6 +157,39 @@ 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,
@ -343,11 +382,27 @@ 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;
}
@ -1032,6 +1087,8 @@ 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)