On some ACPI platforms, such as Chromebooks the ACPI methods to
change the power-state (_PS0 and _PS3) fully take care of powering
on/off the sensor.
On other ACPI platforms, such as e.g. various HP models with IPU6 +
hi556 sensor, the sensor driver must control the reset GPIO itself.
Add support for having the driver control an optional reset GPIO.
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
drivers/media/i2c/hi556.c | 45 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 44 insertions(+), 1 deletion(-)
diff --git a/drivers/media/i2c/hi556.c b/drivers/media/i2c/hi556.c
index 96bae9914d52..f5a39b83598b 100644
--- a/drivers/media/i2c/hi556.c
+++ b/drivers/media/i2c/hi556.c
@@ -4,6 +4,7 @@
#include <asm/unaligned.h>
#include <linux/acpi.h>
#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
@@ -633,6 +634,9 @@ struct hi556 {
struct v4l2_ctrl *hblank;
struct v4l2_ctrl *exposure;
+ /* GPIOs, clocks, etc. */
+ struct gpio_desc *reset_gpio;
+
/* Current mode */
const struct hi556_mode *cur_mode;
@@ -1276,6 +1280,25 @@ static void hi556_remove(struct i2c_client *client)
mutex_destroy(&hi556->mutex);
}
+static int hi556_suspend(struct device *dev)
+{
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
+ struct hi556 *hi556 = to_hi556(sd);
+
+ gpiod_set_value_cansleep(hi556->reset_gpio, 1);
+ return 0;
+}
+
+static int hi556_resume(struct device *dev)
+{
+ struct v4l2_subdev *sd = dev_get_drvdata(dev);
+ struct hi556 *hi556 = to_hi556(sd);
+
+ gpiod_set_value_cansleep(hi556->reset_gpio, 0);
+ usleep_range(5000, 5500);
+ return 0;
+}
+
static int hi556_probe(struct i2c_client *client)
{
struct hi556 *hi556;
@@ -1295,12 +1318,24 @@ static int hi556_probe(struct i2c_client *client)
v4l2_i2c_subdev_init(&hi556->sd, client, &hi556_subdev_ops);
+ hi556->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(hi556->reset_gpio))
+ return dev_err_probe(&client->dev, PTR_ERR(hi556->reset_gpio),
+ "failed to get reset GPIO\n");
+
full_power = acpi_dev_state_d0(&client->dev);
if (full_power) {
+ /* Ensure non ACPI managed resources are enabled */
+ ret = hi556_resume(&client->dev);
+ if (ret)
+ return dev_err_probe(&client->dev, ret,
+ "failed to power on sensor\n");
+
ret = hi556_identify_module(hi556);
if (ret) {
dev_err(&client->dev, "failed to find sensor: %d", ret);
- return ret;
+ goto probe_error_power_off;
}
}
@@ -1345,9 +1380,16 @@ static int hi556_probe(struct i2c_client *client)
v4l2_ctrl_handler_free(hi556->sd.ctrl_handler);
mutex_destroy(&hi556->mutex);
+probe_error_power_off:
+ if (full_power)
+ hi556_suspend(&client->dev);
+
return ret;
}
+static DEFINE_RUNTIME_DEV_PM_OPS(hi556_pm_ops, hi556_suspend, hi556_resume,
+ NULL);
+
#ifdef CONFIG_ACPI
static const struct acpi_device_id hi556_acpi_ids[] = {
{"INT3537"},
@@ -1361,6 +1403,7 @@ static struct i2c_driver hi556_i2c_driver = {
.driver = {
.name = "hi556",
.acpi_match_table = ACPI_PTR(hi556_acpi_ids),
+ .pm = pm_sleep_ptr(&hi556_pm_ops),
},
.probe = hi556_probe,
.remove = hi556_remove,
--
2.44.0
