hwmon: (lm87) Allow channel data to be set from dts file

Currently there is no method for setting the channel
value from the DTS file. When, the driver uses a dts
file to initialize the driver platform_data is not set.
As a result channel variable may not be set correctly.

Without the channel variable set correctly, some of the
sensors will not be initialized correctly. For example
temp3 sensor sysfs entries.

This implements the schema agreed with the device tree
binding document.

Signed-off-by: Mahoda Ratnayaka <mahoda.ratnayaka@alliedtelesis.co.nz>
Tested-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/lm87.c b/drivers/hwmon/lm87.c
index e06faf9d3f0f4f38375714e998689d2edc7725c4..04a7a1ddb030cd09e934c497d4653112af6fdc04 100644 (file)
--- a/drivers/hwmon/lm87.c
+++ b/drivers/hwmon/lm87.c
@@ -66,6 +66,7 @@
 #include <linux/hwmon-vid.h>
 #include <linux/err.h>
 #include <linux/mutex.h>
+#include <linux/regulator/consumer.h>
 
 /*
  * Addresses to scan
@@ -855,8 +856,26 @@ static int lm87_init_client(struct i2c_client *client)
 {
        struct lm87_data *data = i2c_get_clientdata(client);
        int rc;
-
-       if (dev_get_platdata(&client->dev)) {
+       struct device_node *of_node = client->dev.of_node;
+       u8 val = 0;
+       struct regulator *vcc = NULL;
+
+       if (of_node) {
+               if (of_property_read_bool(of_node, "has-temp3"))
+                       val |= CHAN_TEMP3;
+               if (of_property_read_bool(of_node, "has-in6"))
+                       val |= CHAN_NO_FAN(0);
+               if (of_property_read_bool(of_node, "has-in7"))
+                       val |= CHAN_NO_FAN(1);
+               vcc = devm_regulator_get_optional(&client->dev, "vcc");
+               if (!IS_ERR(vcc)) {
+                       if (regulator_get_voltage(vcc) == 5000000)
+                               val |= CHAN_VCC_5V;
+               }
+               data->channel = val;
+               lm87_write_value(client,
+                               LM87_REG_CHANNEL_MODE, data->channel);
+       } else if (dev_get_platdata(&client->dev)) {
                data->channel = *(u8 *)dev_get_platdata(&client->dev);
                lm87_write_value(client,
                                 LM87_REG_CHANNEL_MODE, data->channel);