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media: ov7670: Add the ov7670_s_power function 

Add the ov7670_s_power function which is responsible for
manipulating the power dowm mode through the PWDN pin and the reset
operation through the RESET pin, and keep it powered at all times.

[sakari.ailus@linux.intel.com: set pwdn_gpio direction only once]
Signed-off-by: Wenyou Yang <wenyou.yang@microchip.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Wenyou Yang 2017-10-16 05:14:27 +02:00 committed by Mauro Carvalho Chehab
parent c0662dd4e7
commit 71862f63f3
1 changed files with 26 additions and 5 deletions
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31
drivers/media/i2c/ov7670.c
View File

@ -1544,6 +1544,22 @@ static int ov7670_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_regis
}
#endif
static int ov7670_s_power(struct v4l2_subdev *sd, int on)
{
struct ov7670_info *info = to_state(sd);
if (info->pwdn_gpio)
gpiod_set_value(info->pwdn_gpio, !on);
if (on && info->resetb_gpio) {
gpiod_set_value(info->resetb_gpio, 1);
usleep_range(500, 1000);
gpiod_set_value(info->resetb_gpio, 0);
usleep_range(3000, 5000);
}
return 0;
}
static void ov7670_get_default_format(struct v4l2_subdev *sd,
struct v4l2_mbus_framefmt *format)
{
@ -1694,23 +1710,25 @@ static int ov7670_probe(struct i2c_client *client,
if (ret)
return ret;
ret = ov7670_init_gpio(client, info);
if (ret)
goto clk_disable;
info->clock_speed = clk_get_rate(info->clk) / 1000000;
if (info->clock_speed < 10 || info->clock_speed > 48) {
ret = -EINVAL;
goto clk_disable;
}
ret = ov7670_init_gpio(client, info);
if (ret)
goto clk_disable;
ov7670_s_power(sd, 1);
/* Make sure it's an ov7670 */
ret = ov7670_detect(sd);
if (ret) {
v4l_dbg(1, debug, client,
"chip found @ 0x%x (%s) is not an ov7670 chip.\n",
client->addr << 1, client->adapter->name);
goto clk_disable;
goto power_off;
}
v4l_info(client, "chip found @ 0x%02x (%s)\n",
client->addr << 1, client->adapter->name);
@ -1789,6 +1807,8 @@ static int ov7670_probe(struct i2c_client *client,
#endif
hdl_free:
v4l2_ctrl_handler_free(&info->hdl);
power_off:
ov7670_s_power(sd, 0);
clk_disable:
clk_disable_unprepare(info->clk);
return ret;
@ -1806,6 +1826,7 @@ static int ov7670_remove(struct i2c_client *client)
#if defined(CONFIG_MEDIA_CONTROLLER)
media_entity_cleanup(&info->sd.entity);
#endif
ov7670_s_power(sd, 0);
return 0;
}