shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-07 19:30:30 +09:00
Code Issues Packages Projects Releases Wiki Activity

iio: light: vl6180: support power control using gpio

Browse Source 
There are AVDD and GPIO0/CE in the pinout of STMicro VL6180:
  - AVDD (Digital/analog power supply 2.6 to 3.0 V),
  - GPIO0/CE (Power-up default is chip enable (CE)).

These two pins are gpio connected in some reference design boards and
control the power in the Power-up timing constraints. This patch
emulates this situation.

Signed-off-by: Jason Zhang <jason.zhang@rock-chips.com>
Change-Id: I610455ea7ca738303ec6dd6ff496576ff2e716ce
This commit is contained in:
Jason Zhang
2022-06-15 14:34:00 +08:00
committed by Tao Huang
parent 487de35b82
commit 9a87d22369
1 changed files with 42 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
drivers/iio/light/vl6180.c
View File

@@ -26,6 +26,8 @@
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#define VL6180_DRV_NAME "vl6180"
@@ -87,6 +89,8 @@ struct vl6180_data {
struct mutex lock;
unsigned int als_gain_milli;
unsigned int als_it_ms;
struct gpio_desc *avdd;
struct gpio_desc *chip_enable;
};
enum { VL6180_ALS, VL6180_RANGE, VL6180_PROX };
@@ -439,11 +443,40 @@ static const struct iio_info vl6180_info = {
.attrs = &vl6180_attribute_group,
};
static int vl6180_power_enable(struct vl6180_data *data)
{
/* Enable power supply. */
if (!IS_ERR_OR_NULL(data->avdd))
gpiod_set_value_cansleep(data->avdd, 1);
/* Power-up default is chip enable (CE). */
if (!IS_ERR_OR_NULL(data->chip_enable)) {
gpiod_set_value_cansleep(data->chip_enable, 0);
usleep_range(500, 1000);
gpiod_set_value_cansleep(data->chip_enable, 1);
}
return 0;
}
static int vl6180_init(struct vl6180_data *data)
{
struct i2c_client *client = data->client;
int ret;
ret = vl6180_power_enable(data);
if (ret) {
dev_err(&client->dev, "failed to configure power\n");
return ret;
}
/*
* After the MCU boot sequence the device enters software standby,
* host initialization can commence immediately after entering
* software standby.
*/
usleep_range(500, 1000);
ret = vl6180_read_byte(client, VL6180_MODEL_ID);
if (ret < 0)
return ret;
@@ -515,6 +548,15 @@ static int vl6180_probe(struct i2c_client *client,
indio_dev->name = VL6180_DRV_NAME;
indio_dev->modes = INDIO_DIRECT_MODE;
/*
* NOTE: If the power is controlled by gpio, the power
* configuration should match the power-up timing.
*/
data->avdd = devm_gpiod_get_optional(&client->dev, "avdd",
GPIOD_OUT_HIGH);
data->chip_enable = devm_gpiod_get_optional(&client->dev, "chip-enable",
GPIOD_OUT_HIGH);
ret = vl6180_init(data);
if (ret < 0)
return ret;