[PATCH 7/9] input: goodix: add power management support

Irina Tirdea
2015-05-28T12:48:58Z

Implement suspend/resume for goodix driver.

Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
---
drivers/input/touchscreen/goodix.c | 81 +++++++++++++++++++++++++++++++++++---
1 file changed, 76 insertions(+), 5 deletions(-)

diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
index 22052c9..ce7e834 100644
--- a/drivers/input/touchscreen/goodix.c
+++ b/drivers/input/touchscreen/goodix.c
@@ -37,6 +37,7 @@ struct goodix_ts_data {
unsigned int int_trigger_type;
struct gpio_desc *gpiod_int;
struct gpio_desc *gpiod_rst;
+ unsigned long irq_flags;
};

#define GOODIX_GPIO_INT_NAME "irq"
@@ -52,6 +53,9 @@ struct goodix_ts_data {
#define GOODIX_CONFIG_MAX_LENGTH 240

/* Register defines */
+#define GOODIX_REG_COMMAND 0x8040
+#define GOODIX_CMD_SCREEN_OFF 0x05
+
#define GOODIX_READ_COOR_ADDR 0x814E
#define GOODIX_REG_CONFIG_DATA 0x8047
#define GOODIX_REG_ID 0x8140
@@ -129,6 +133,11 @@ static int goodix_i2c_write(struct i2c_client *client, u16 reg, u8 *buf,
return ret < 0 ? ret : (ret != 1 ? -EIO : 0);
}

+static int goodix_i2c_write_u8(struct i2c_client *client, u16 reg, u8 value)
+{
+ return goodix_i2c_write(client, reg, &value, sizeof(value));
+}
+
static int goodix_ts_read_input_report(struct goodix_ts_data *ts, u8 *data)
{
int touch_num;
@@ -227,6 +236,18 @@ static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}

+static void goodix_free_irq(struct goodix_ts_data *ts)
+{
+ devm_free_irq(&ts->client->dev, ts->client->irq, ts);
+}
+
+static int goodix_request_irq(struct goodix_ts_data *ts)
+{
+ return devm_request_threaded_irq(&ts->client->dev, ts->client->irq,
+ NULL, goodix_ts_irq_handler,
+ ts->irq_flags, ts->client->name, ts);
+}
+
/**
* goodix_get_cfg - Get device config from ACPI/DT.
*
@@ -562,7 +583,6 @@ static int goodix_ts_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct goodix_ts_data *ts;
- unsigned long irq_flags;
int error;
u16 version_info, id_info;

@@ -614,10 +634,8 @@ static int goodix_ts_probe(struct i2c_client *client,
if (error)
return error;

- irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT;
- error = devm_request_threaded_irq(&ts->client->dev, client->irq,
- NULL, goodix_ts_irq_handler,
- irq_flags, client->name, ts);
+ ts->irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT;
+ error = goodix_request_irq(ts);
if (error) {
dev_err(&client->dev, "request IRQ failed: %d\n", error);
return error;
@@ -626,6 +644,58 @@ static int goodix_ts_probe(struct i2c_client *client,
return 0;
}

+#ifdef CONFIG_PM_SLEEP
+static int goodix_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct goodix_ts_data *ts = i2c_get_clientdata(client);
+ int ret;
+
+ goodix_free_irq(ts);
+ ret = gpiod_direction_output(ts->gpiod_int, 0);
+ if (ret) {
+ goodix_request_irq(ts);
+ return ret;
+ }
+ usleep_range(5000, 6000);
+
+ ret = goodix_i2c_write_u8(ts->client, GOODIX_REG_COMMAND,
+ GOODIX_CMD_SCREEN_OFF);
+ if (ret) {
+ dev_err(&ts->client->dev, "Screen off command failed\n");
+ gpiod_direction_input(ts->gpiod_int);
+ goodix_request_irq(ts);
+ return -EAGAIN;
+ }
+
+ /*
+ * To avoid waking up while is not sleeping,
+ * delay 58ms to ensure reliability
+ */
+ msleep(58);
+ return 0;
+}
+
+static int goodix_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct goodix_ts_data *ts = i2c_get_clientdata(client);
+ int ret;
+
+ ret = gpiod_direction_output(ts->gpiod_int, 1);
+ if (ret)
+ return ret;
+ usleep_range(2000, 5000); /* 2ms~5ms */
+ ret = goodix_int_sync(ts);
+ if (ret)
+ return ret;
+
+ return goodix_request_irq(ts);
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(goodix_pm_ops, goodix_suspend, goodix_resume);
+
static const struct i2c_device_id goodix_ts_id[] = {
{ "GDIX1001:00", 0 },
{ }
@@ -663,6 +733,7 @@ static struct i2c_driver goodix_ts_driver = {
.owner = THIS_MODULE,
.acpi_match_table = ACPI_PTR(goodix_acpi_match),
.of_match_table = of_match_ptr(goodix_of_match),
+ .pm = &goodix_pm_ops,
},
};
module_i2c_driver(goodix_ts_driver);
--
1.9.1