[PATCH v18 07/12] input: cyapa: add gen3 trackpad device read baseline function support

Dudley Du
2015-01-16T06:35:33Z

Add read baseline function supported for gen3 trackpad device,
it can be used through sysfs baseline interface.
TEST=test on Chromebooks.

Signed-off-by: Dudley Du <dudl@cypress.com>
---
drivers/input/mouse/cyapa_gen3.c | 72 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 72 insertions(+)

diff --git a/drivers/input/mouse/cyapa_gen3.c b/drivers/input/mouse/cyapa_gen3.c
index 214d45a..6e04e4b 100644
--- a/drivers/input/mouse/cyapa_gen3.c
+++ b/drivers/input/mouse/cyapa_gen3.c
@@ -783,6 +783,76 @@ static int cyapa_gen3_do_fw_update(struct cyapa *cyapa,
return 0;
}

+static ssize_t cyapa_gen3_show_baseline(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct cyapa *cyapa = dev_get_drvdata(dev);
+ int max_baseline, min_baseline;
+ int tries;
+ int ret;
+
+ ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
+ if (ret < 0) {
+ dev_err(dev, "Error reading dev status. err = %d\n", ret);
+ goto out;
+ }
+ if ((ret & CYAPA_DEV_NORMAL) != CYAPA_DEV_NORMAL) {
+ dev_warn(dev, "Trackpad device is busy. device state = 0x%x\n",
+ ret);
+ ret = -EAGAIN;
+ goto out;
+ }
+
+ ret = cyapa_write_byte(cyapa, CYAPA_CMD_SOFT_RESET,
+ OP_REPORT_BASELINE_MASK);
+ if (ret < 0) {
+ dev_err(dev, "Failed to send report baseline command. %d\n",
+ ret);
+ goto out;
+ }
+
+ tries = 3; /* Try for 30 to 60 ms */
+ do {
+ usleep_range(10000, 20000);
+
+ ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS);
+ if (ret < 0) {
+ dev_err(dev, "Error reading dev status. err = %d\n",
+ ret);
+ goto out;
+ }
+ if ((ret & CYAPA_DEV_NORMAL) == CYAPA_DEV_NORMAL)
+ break;
+ } while (--tries);
+
+ if (tries == 0) {
+ dev_err(dev, "Device timed out going to Normal state.\n");
+ ret = -ETIMEDOUT;
+ goto out;
+ }
+
+ ret = cyapa_read_byte(cyapa, CYAPA_CMD_MAX_BASELINE);
+ if (ret < 0) {
+ dev_err(dev, "Failed to read max baseline. err = %d\n", ret);
+ goto out;
+ }
+ max_baseline = ret;
+
+ ret = cyapa_read_byte(cyapa, CYAPA_CMD_MIN_BASELINE);
+ if (ret < 0) {
+ dev_err(dev, "Failed to read min baseline. err = %d\n", ret);
+ goto out;
+ }
+ min_baseline = ret;
+
+ dev_dbg(dev, "Baseline report successful. Max: %d Min: %d\n",
+ max_baseline, min_baseline);
+ ret = scnprintf(buf, PAGE_SIZE, "%d %d\n", max_baseline, min_baseline);
+
+out:
+ return ret;
+}
+
/*
* cyapa_get_wait_time_for_pwr_cmd
*
@@ -1104,6 +1174,8 @@ const struct cyapa_dev_ops cyapa_gen3_ops = {
.bl_deactivate = cyapa_gen3_bl_deactivate,
.bl_initiate = cyapa_gen3_bl_initiate,

+ .show_baseline = cyapa_gen3_show_baseline,
+
.initialize = cyapa_gen3_initialize,

.state_parse = cyapa_gen3_state_parse,
--
1.9.1