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| author | Alexander Koch <mail@alexanderkoch.net> | 2017-01-06 11:38:15 +0100 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2017-01-10 09:09:18 -0800 |
| commit | a45923c27de4a101e846795d76420936b62bb659 (patch) | |
| tree | 4132db967da4675683994834d94dda5de105a5f4 /drivers/hwmon | |
| parent | bbcf37d73c2d3b4fa1a5781c992289b9a90c1480 (diff) | |
| download | linux-stable-a45923c27de4a101e846795d76420936b62bb659.tar.gz linux-stable-a45923c27de4a101e846795d76420936b62bb659.tar.bz2 linux-stable-a45923c27de4a101e846795d76420936b62bb659.zip | |
hwmon: (adc128d818) Implement mode selection via dt
Implement operation mode selection using the optional 'ti,mode' devicetree
property (see [1]). The ADC128D818 supports four operation modes differing
in the number and type of input readings (see datasheet, sec. 8.4.1), of
which mode 0 is the default.
We only add handling of the 'ti,mode' property here, the driver still
supports nothing else than the default mode 0.
[1] Documentation/devicetree/bindings/hwmon/adc128d818.txt
Signed-off-by: Alexander Koch <mail@alexanderkoch.net>
Acked-by: Michael Hornung <mhornung.linux@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/adc128d818.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/hwmon/adc128d818.c b/drivers/hwmon/adc128d818.c index ad2b47e40345..2b61936c32ff 100644 --- a/drivers/hwmon/adc128d818.c +++ b/drivers/hwmon/adc128d818.c @@ -28,6 +28,7 @@ #include <linux/regulator/consumer.h> #include <linux/mutex.h> #include <linux/bitops.h> +#include <linux/of.h> /* Addresses to scan * The chip also supports addresses 0x35..0x37. Don't scan those addresses @@ -63,6 +64,7 @@ struct adc128_data { struct regulator *regulator; int vref; /* Reference voltage in mV */ struct mutex update_lock; + u8 mode; /* Operation mode */ bool valid; /* true if following fields are valid */ unsigned long last_updated; /* In jiffies */ @@ -387,6 +389,15 @@ static int adc128_init_client(struct adc128_data *data) if (err) return err; + /* Set operation mode, if non-default */ + if (data->mode != 0) { + err = i2c_smbus_write_byte_data(client, + ADC128_REG_CONFIG_ADV, + data->mode << 1); + if (err) + return err; + } + /* Start monitoring */ err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x01); if (err) @@ -433,6 +444,19 @@ static int adc128_probe(struct i2c_client *client, data->vref = 2560; /* 2.56V, in mV */ } + /* Operation mode is optional and defaults to mode 0 */ + if (of_property_read_u8(dev->of_node, "ti,mode", &data->mode) == 0) { + /* Currently only mode 0 supported */ + if (data->mode != 0) { + dev_err(dev, "unsupported operation mode %d\n", + data->mode); + err = -EINVAL; + goto error; + } + } else { + data->mode = 0; + } + data->client = client; i2c_set_clientdata(client, data); mutex_init(&data->update_lock); |