diff options
| author | Dudley Du <dudl@cypress.com> | 2015-01-17 22:13:48 -0800 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2015-01-18 00:10:31 -0800 |
| commit | e0f79cb799daf2860aed3fe18a73ad9dd8154a84 (patch) | |
| tree | 3ada6ae97d6abbe8d04639d5c4df314ca5c7ce27 /drivers/input | |
| parent | f50efd06e0d156ba7bdb12898c9c1dc75fc4e199 (diff) | |
| download | linux-e0f79cb799daf2860aed3fe18a73ad9dd8154a84.tar.bz2 | |
Input: cyapa - add gen3 trackpad force re-calibrate support
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>
Diffstat (limited to 'drivers/input')
| -rw-r--r-- | drivers/input/mouse/cyapa_gen3.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/drivers/input/mouse/cyapa_gen3.c b/drivers/input/mouse/cyapa_gen3.c index 6e04e4b08e63..77e9d70a986b 100644 --- a/drivers/input/mouse/cyapa_gen3.c +++ b/drivers/input/mouse/cyapa_gen3.c @@ -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, |