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authorAlexander Koch <mail@alexanderkoch.net>2017-01-06 11:38:15 +0100
committerGuenter Roeck <linux@roeck-us.net>2017-01-10 09:09:18 -0800
commita45923c27de4a101e846795d76420936b62bb659 (patch)
tree4132db967da4675683994834d94dda5de105a5f4 /drivers/hwmon
parentbbcf37d73c2d3b4fa1a5781c992289b9a90c1480 (diff)
downloadlinux-a45923c27de4a101e846795d76420936b62bb659.tar.bz2
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.c24
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);