Split i2c_hid_hwreset() into:
i2c_hid_start_hwreset() which sends the PWR_ON and reset commands; and
i2c_hid_finish_hwreset() which actually waits for the reset to complete.
This is a preparation patch for removing the need for
I2C_HID_QUIRK_NO_IRQ_AFTER_RESET by making i2c-hid behave
more like Windows.
No functional changes intended.
Reviewed-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
Changes in v2:
-Move the mutex_[un]lock(&ihid->reset_lock) calls from
i2c_hid_start_hwreset() / i2c_hid_finish_hwreset() to the callers
to make the locking more clear
---
drivers/hid/i2c-hid/i2c-hid-core.c | 38 ++++++++++++++++++++++--------
1 file changed, 28 insertions(+), 10 deletions(-)
diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c
index ca2a4ccb9abf..21d65ca32866 100644
--- a/drivers/hid/i2c-hid/i2c-hid-core.c
+++ b/drivers/hid/i2c-hid/i2c-hid-core.c
@@ -426,7 +426,7 @@ static int i2c_hid_set_power(struct i2c_hid *ihid, int power_state)
return ret;
}
-static int i2c_hid_hwreset(struct i2c_hid *ihid)
+static int i2c_hid_start_hwreset(struct i2c_hid *ihid)
{
size_t length = 0;
int ret;
@@ -438,11 +438,11 @@ static int i2c_hid_hwreset(struct i2c_hid *ihid)
* being reset. Otherwise we may lose the reset complete
* interrupt.
*/
- mutex_lock(&ihid->reset_lock);
+ lockdep_assert_held(&ihid->reset_lock);
ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON);
if (ret)
- goto err_unlock;
+ return ret;
/* Prepare reset command. Command register goes first. */
*(__le16 *)ihid->cmdbuf = ihid->hdesc.wCommandRegister;
@@ -460,6 +460,18 @@ static int i2c_hid_hwreset(struct i2c_hid *ihid)
goto err_clear_reset;
}
+ return 0;
+
+err_clear_reset:
+ clear_bit(I2C_HID_RESET_PENDING, &ihid->flags);
+ i2c_hid_set_power(ihid, I2C_HID_PWR_SLEEP);
+ return ret;
+}
+
+static int i2c_hid_finish_hwreset(struct i2c_hid *ihid)
+{
+ int ret = 0;
+
i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
if (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET) {
@@ -477,14 +489,11 @@ static int i2c_hid_hwreset(struct i2c_hid *ihid)
if (!(ihid->quirks & I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET))
ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON);
- mutex_unlock(&ihid->reset_lock);
return ret;
err_clear_reset:
clear_bit(I2C_HID_RESET_PENDING, &ihid->flags);
i2c_hid_set_power(ihid, I2C_HID_PWR_SLEEP);
-err_unlock:
- mutex_unlock(&ihid->reset_lock);
return ret;
}
@@ -731,7 +740,11 @@ static int i2c_hid_parse(struct hid_device *hid)
}
do {
- ret = i2c_hid_hwreset(ihid);
+ mutex_lock(&ihid->reset_lock);
+ ret = i2c_hid_start_hwreset(ihid);
+ if (ret == 0)
+ ret = i2c_hid_finish_hwreset(ihid);
+ mutex_unlock(&ihid->reset_lock);
if (ret)
msleep(1000);
} while (tries-- > 0 && ret);
@@ -974,10 +987,15 @@ static int i2c_hid_core_resume(struct i2c_hid *ihid)
* However some ALPS touchpads generate IRQ storm without reset, so
* let's still reset them here.
*/
- if (ihid->quirks & I2C_HID_QUIRK_RESET_ON_RESUME)
- ret = i2c_hid_hwreset(ihid);
- else
+ if (ihid->quirks & I2C_HID_QUIRK_RESET_ON_RESUME) {
+ mutex_lock(&ihid->reset_lock);
+ ret = i2c_hid_start_hwreset(ihid);
+ if (ret == 0)
+ ret = i2c_hid_finish_hwreset(ihid);
+ mutex_unlock(&ihid->reset_lock);
+ } else {
ret = i2c_hid_set_power(ihid, I2C_HID_PWR_ON);
+ }
if (ret)
return ret;
--
2.41.0
