diff options
Diffstat (limited to 'drivers/media/i2c')
| -rw-r--r-- | drivers/media/i2c/ov2740.c | 48 |
1 files changed, 46 insertions, 2 deletions
diff --git a/drivers/media/i2c/ov2740.c b/drivers/media/i2c/ov2740.c index f0be51b343a7..fef1b6f3f316 100644 --- a/drivers/media/i2c/ov2740.c +++ b/drivers/media/i2c/ov2740.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> @@ -333,6 +334,9 @@ struct ov2740 { struct v4l2_ctrl *hblank; struct v4l2_ctrl *exposure; + /* GPIOs, clocks */ + struct gpio_desc *reset_gpio; + /* Current mode */ const struct ov2740_mode *cur_mode; @@ -1061,6 +1065,26 @@ static int ov2740_register_nvmem(struct i2c_client *client, return 0; } +static int ov2740_suspend(struct device *dev) +{ + struct v4l2_subdev *sd = dev_get_drvdata(dev); + struct ov2740 *ov2740 = to_ov2740(sd); + + gpiod_set_value_cansleep(ov2740->reset_gpio, 1); + return 0; +} + +static int ov2740_resume(struct device *dev) +{ + struct v4l2_subdev *sd = dev_get_drvdata(dev); + struct ov2740 *ov2740 = to_ov2740(sd); + + gpiod_set_value_cansleep(ov2740->reset_gpio, 0); + msleep(20); + + return 0; +} + static int ov2740_probe(struct i2c_client *client) { struct device *dev = &client->dev; @@ -1076,13 +1100,25 @@ static int ov2740_probe(struct i2c_client *client) if (!ov2740) return -ENOMEM; + ov2740->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(ov2740->reset_gpio)) + return dev_err_probe(dev, PTR_ERR(ov2740->reset_gpio), + "failed to get reset GPIO\n"); + v4l2_i2c_subdev_init(&ov2740->sd, client, &ov2740_subdev_ops); ov2740->sd.internal_ops = &ov2740_internal_ops; full_power = acpi_dev_state_d0(&client->dev); if (full_power) { - ret = ov2740_identify_module(ov2740); + /* ACPI does not always clear the reset GPIO / enable the clock */ + ret = ov2740_resume(dev); if (ret) - return dev_err_probe(dev, ret, "failed to find sensor\n"); + return dev_err_probe(dev, ret, "failed to power on sensor\n"); + + ret = ov2740_identify_module(ov2740); + if (ret) { + dev_err_probe(dev, ret, "failed to find sensor\n"); + goto probe_error_power_off; + } } ov2740->cur_mode = &supported_modes[0]; @@ -1136,9 +1172,16 @@ probe_error_media_entity_cleanup: probe_error_v4l2_ctrl_handler_free: v4l2_ctrl_handler_free(ov2740->sd.ctrl_handler); +probe_error_power_off: + if (full_power) + ov2740_suspend(dev); + return ret; } +static DEFINE_RUNTIME_DEV_PM_OPS(ov2740_pm_ops, ov2740_suspend, ov2740_resume, + NULL); + static const struct acpi_device_id ov2740_acpi_ids[] = { {"INT3474"}, {} @@ -1150,6 +1193,7 @@ static struct i2c_driver ov2740_i2c_driver = { .driver = { .name = "ov2740", .acpi_match_table = ov2740_acpi_ids, + .pm = pm_sleep_ptr(&ov2740_pm_ops), }, .probe = ov2740_probe, .remove = ov2740_remove, |