[PATCH v18 11/12] input: cyapa: add gen5 trackpad device force re-calibrate function support

Dudley Du
2015-01-16T06:35:43Z

Add force re-calibrate function supported for gen5 trackpad device,
it can be used through sysfs calibrate interface.
TEST=test on Chromebooks.

Signed-off-by: Dudley Du <dudl@cypress.com>
---
drivers/input/mouse/cyapa_gen5.c | 65 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 65 insertions(+)

diff --git a/drivers/input/mouse/cyapa_gen5.c b/drivers/input/mouse/cyapa_gen5.c
index 7c6e339..ced2a2c 100644
--- a/drivers/input/mouse/cyapa_gen5.c
+++ b/drivers/input/mouse/cyapa_gen5.c
@@ -1715,6 +1715,70 @@ static int cyapa_gen5_suspend_scanning(struct cyapa *cyapa)
return 0;
}

+static int cyapa_gen5_calibrate_pwcs(struct cyapa *cyapa,
+ u8 calibrate_sensing_mode_type)
+{
+ struct gen5_app_cmd_head *app_cmd_head;
+ u8 cmd[8];
+ u8 resp_data[6];
+ int resp_len;
+ int error;
+
+ /* Try to dump all buffered data before doing command. */
+ cyapa_empty_pip_output_data(cyapa, NULL, NULL, NULL);
+
+ memset(cmd, 0, sizeof(cmd));
+ app_cmd_head = (struct gen5_app_cmd_head *)cmd;
+ put_unaligned_le16(GEN5_OUTPUT_REPORT_ADDR, &app_cmd_head->addr);
+ put_unaligned_le16(sizeof(cmd) - 2, &app_cmd_head->length);
+ app_cmd_head->report_id = GEN5_APP_CMD_REPORT_ID;
+ app_cmd_head->cmd_code = GEN5_CMD_CALIBRATE;
+ app_cmd_head->parameter_data[0] = calibrate_sensing_mode_type;
+ resp_len = sizeof(resp_data);
+ error = cyapa_i2c_pip_cmd_irq_sync(cyapa,
+ cmd, sizeof(cmd),
+ resp_data, &resp_len,
+ 5000, cyapa_gen5_sort_tsg_pip_app_resp_data, true);
+ if (error || !VALID_CMD_RESP_HEADER(resp_data, GEN5_CMD_CALIBRATE) ||
+ !GEN5_CMD_COMPLETE_SUCCESS(resp_data[5]))
+ return error < 0 ? error : -EAGAIN;
+
+ return 0;
+}
+
+static ssize_t cyapa_gen5_do_calibrate(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct cyapa *cyapa = dev_get_drvdata(dev);
+ int error, calibrate_error;
+
+ /* 1. Suspend Scanning*/
+ error = cyapa_gen5_suspend_scanning(cyapa);
+ if (error)
+ return error;
+
+ /* 2. Do mutual capacitance fine calibrate. */
+ calibrate_error = cyapa_gen5_calibrate_pwcs(cyapa,
+ CYAPA_SENSING_MODE_MUTUAL_CAP_FINE);
+ if (calibrate_error)
+ goto resume_scanning;
+
+ /* 3. Do self capacitance calibrate. */
+ calibrate_error = cyapa_gen5_calibrate_pwcs(cyapa,
+ CYAPA_SENSING_MODE_SELF_CAP);
+ if (calibrate_error)
+ goto resume_scanning;
+
+resume_scanning:
+ /* 4. Resume Scanning*/
+ error = cyapa_gen5_resume_scanning(cyapa);
+ if (error || calibrate_error)
+ return error ? error : calibrate_error;
+
+ return count;
+}
+
static s32 twos_complement_to_s32(s32 value, int num_bits)
{
if (value >> (num_bits - 1))
@@ -2696,6 +2760,7 @@ const struct cyapa_dev_ops cyapa_gen5_ops = {
.bl_deactivate = cyapa_gen5_bl_deactivate,

.show_baseline = cyapa_gen5_show_baseline,
+ .calibrate_store = cyapa_gen5_do_calibrate,

.initialize = cyapa_gen5_initialize,

--
1.9.1