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Input: cyapa - add gen3 trackpad force re-calibrate support

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Add force re-calibrate function support for gen3 trackpad device, it can be
used through sysfs calibrate interface.

Signed-off-by: Dudley Du <dudl@cypress.com>
Tested-by: Jeremiah Mahler <jmmahler@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dudley Du 2015-01-17 22:13:48 -08:00 committed by Dmitry Torokhov
parent f50efd06e0
commit e0f79cb799
1 changed files with 59 additions and 0 deletions
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59
drivers/input/mouse/cyapa_gen3.c
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@ -783,6 +783,64 @@ static int cyapa_gen3_do_fw_update(struct cyapa *cyapa,
return 0;
}
static ssize_t cyapa_gen3_do_calibrate(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct cyapa *cyapa = dev_get_drvdata(dev);
int tries;
int ret;
ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
if (ret < 0) {
dev_err(dev, "Error reading dev status: %d\n", ret);
goto out;
}
if ((ret & CYAPA_DEV_NORMAL) != CYAPA_DEV_NORMAL) {
dev_warn(dev, "Trackpad device is busy, device state: 0x%02x\n",
ret);
ret = -EAGAIN;
goto out;
}
ret = cyapa_write_byte(cyapa, CYAPA_CMD_SOFT_RESET,
OP_RECALIBRATION_MASK);
if (ret < 0) {
dev_err(dev, "Failed to send calibrate command: %d\n",
ret);
goto out;
}
tries = 20; /* max recalibration timeout 2s. */
do {
/*
* For this recalibration, the max time will not exceed 2s.
* The average time is approximately 500 - 700 ms, and we
* will check the status every 100 - 200ms.
*/
usleep_range(100000, 200000);
ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
if (ret < 0) {
dev_err(dev, "Error reading dev status: %d\n",
ret);
goto out;
}
if ((ret & CYAPA_DEV_NORMAL) == CYAPA_DEV_NORMAL)
break;
} while (--tries);
if (tries == 0) {
dev_err(dev, "Failed to calibrate. Timeout.\n");
ret = -ETIMEDOUT;
goto out;
}
dev_dbg(dev, "Calibration successful.\n");
out:
return ret < 0 ? ret : count;
}
static ssize_t cyapa_gen3_show_baseline(struct device *dev,
struct device_attribute *attr, char *buf)
{
@ -1175,6 +1233,7 @@ const struct cyapa_dev_ops cyapa_gen3_ops = {
.bl_initiate = cyapa_gen3_bl_initiate,
.show_baseline = cyapa_gen3_show_baseline,
.calibrate_store = cyapa_gen3_do_calibrate,
.initialize = cyapa_gen3_initialize,