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media: hi556: Add support for reset GPIO

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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@redhat.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
This commit is contained in:
Hans de Goede 2024-04-15 15:10:36 +02:00 committed by Hans Verkuil
parent 7d968b5bad
commit 860f262dd0
1 changed files with 44 additions and 1 deletions
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45
drivers/media/i2c/hi556.c
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@ -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 @@ probe_error_v4l2_ctrl_handler_free:
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,