Commit 86da28ee authored by Chris Packham's avatar Chris Packham Committed by Guenter Roeck
Browse files

hwmon: (adt7475) Add support for inverting pwm output 



Add a "adi,pwm-active-state" device-tree property to allow hardware
designs to use inverted logic on the PWM output.

Signed-off-by: default avatarChris Packham <chris.packham@alliedtelesis.co.nz>
[groeck: dev_err -> dev_warn]
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 2ecff397

drivers/hwmon/adt7475.c

+34 −0
Original line number Diff line number Diff line
@@ -1509,6 +1509,36 @@ static int load_attenuators(const struct i2c_client *client, int chip, 
	return 0;

}



static int adt7475_set_pwm_polarity(struct i2c_client *client)

{

	u32 states[ADT7475_PWM_COUNT];

	int ret, i;

	u8 val;



	ret = of_property_read_u32_array(client->dev.of_node,

					 "adi,pwm-active-state", states,

					 ARRAY_SIZE(states));

	if (ret)

		return ret;



	for (i = 0; i < ADT7475_PWM_COUNT; i++) {

		ret = adt7475_read(PWM_CONFIG_REG(i));

		if (ret < 0)

			return ret;

		val = ret;

		if (states[i])

			val &= ~BIT(4);

		else

			val |= BIT(4);



		ret = i2c_smbus_write_byte_data(client, PWM_CONFIG_REG(i), val);

		if (ret)

			return ret;

	}



	return 0;

}



static int adt7475_probe(struct i2c_client *client,

			 const struct i2c_device_id *id)

{
@@ -1617,6 +1647,10 @@ static int adt7475_probe(struct i2c_client *client, 
	for (i = 0; i < ADT7475_PWM_COUNT; i++)

		adt7475_read_pwm(client, i);



	ret = adt7475_set_pwm_polarity(client);

	if (ret && ret != -EINVAL)

		dev_warn(&client->dev, "Error configuring pwm polarity\n");



	/* Start monitoring */

	switch (chip) {

	case adt7475:

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