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authorHungNien Chen <hn.chen@weidahitech.com>2016-11-10 06:47:13 +0300
committerJiri Kosina <jkosina@suse.cz>2016-11-10 12:23:31 +0300
commit71af01a8c85ad89449209594133bdfdfaa9f1e2a (patch)
tree59ed8a66644bc22e2c94ef470ffe05ff50598218 /drivers/hid/i2c-hid
parent93d26aeab54cc91119760bc4f1f22bff9a987d70 (diff)
downloadlinux-71af01a8c85ad89449209594133bdfdfaa9f1e2a.tar.xz
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>
Diffstat (limited to 'drivers/hid/i2c-hid')
-rw-r--r--drivers/hid/i2c-hid/i2c-hid.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index fe6b4e0eab4a..ce518795cb30 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -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)