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hwmon: (sht15) Add device tree support 

Allow the driver to work with device tree support.

Based on initial patch submission from Peter Fox.

Tested on a imx7d-sdb board connected to a SHT15 board via Mikro Bus.

Signed-off-by: Marco Franchi <marco.franchi@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Marco Franchi 2017-02-16 10:23:43 -02:00 committed by Guenter Roeck
parent 87d08b11b1
commit 2f1736ff06
2 changed files with 79 additions and 4 deletions
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19
Documentation/devicetree/bindings/hwmon/sht15.txt Normal file
View File

@ -0,0 +1,19 @@
Sensirion SHT15 Humidity and Temperature Sensor
Required properties:
- "compatible": must be "sensirion,sht15".
- "data-gpios": GPIO connected to the data line.
- "clk-gpios": GPIO connected to the clock line.
- "vcc-supply": regulator that drives the VCC pin.
Example:
sensor {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_sensor>;
compatible = "sensirion,sht15";
clk-gpios = <&gpio4 12 0>;
data-gpios = <&gpio4 13 0>;
vcc-supply = <&reg_sht15>;
};

64
drivers/hwmon/sht15.c
View File

@ -34,6 +34,7 @@
#include <linux/slab.h>
#include <linux/atomic.h>
#include <linux/bitrev.h>
#include <linux/of_gpio.h>
/* Commands */
#define SHT15_MEASURE_TEMP 0x03
@ -911,6 +912,54 @@ static int sht15_invalidate_voltage(struct notifier_block *nb,
return NOTIFY_OK;
}
#ifdef CONFIG_OF
static const struct of_device_id sht15_dt_match[] = {
{ .compatible = "sensirion,sht15" },
{ },
};
MODULE_DEVICE_TABLE(of, sht15_dt_match);
/*
* This function returns NULL if pdev isn't a device instatiated by dt,
* a pointer to pdata if it could successfully get all information
* from dt or a negative ERR_PTR() on error.
*/
static struct sht15_platform_data *sht15_probe_dt(struct device *dev)
{
struct device_node *np = dev->of_node;
struct sht15_platform_data *pdata;
/* no device tree device */
if (!np)
return NULL;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return ERR_PTR(-ENOMEM);
pdata->gpio_data = of_get_named_gpio(np, "data-gpios", 0);
if (pdata->gpio_data < 0) {
if (pdata->gpio_data != -EPROBE_DEFER)
dev_err(dev, "data-gpios not found\n");
return ERR_PTR(pdata->gpio_data);
}
pdata->gpio_sck = of_get_named_gpio(np, "clk-gpios", 0);
if (pdata->gpio_sck < 0) {
if (pdata->gpio_sck != -EPROBE_DEFER)
dev_err(dev, "clk-gpios not found\n");
return ERR_PTR(pdata->gpio_sck);
}
return pdata;
}
#else
static inline struct sht15_platform_data *sht15_probe_dt(struct device *dev)
{
return NULL;
}
#endif
static int sht15_probe(struct platform_device *pdev)
{
int ret;
@ -928,11 +977,17 @@ static int sht15_probe(struct platform_device *pdev)
data->dev = &pdev->dev;
init_waitqueue_head(&data->wait_queue);
if (dev_get_platdata(&pdev->dev) == NULL) {
dev_err(&pdev->dev, "no platform data supplied\n");
return -EINVAL;
data->pdata = sht15_probe_dt(&pdev->dev);
if (IS_ERR(data->pdata))
return PTR_ERR(data->pdata);
if (data->pdata == NULL) {
data->pdata = dev_get_platdata(&pdev->dev);
if (data->pdata == NULL) {
dev_err(&pdev->dev, "no platform data supplied\n");
return -EINVAL;
}
}
data->pdata = dev_get_platdata(&pdev->dev);
data->supply_uv = data->pdata->supply_mv * 1000;
if (data->pdata->checksum)
data->checksumming = true;
@ -1075,6 +1130,7 @@ MODULE_DEVICE_TABLE(platform, sht15_device_ids);
static struct platform_driver sht15_driver = {
.driver = {
.name = "sht15",
.of_match_table = of_match_ptr(sht15_dt_match),
},
.probe = sht15_probe,
.remove = sht15_remove,