iio:adc:ltc2497: Add support for board file based iio consumer mapping.

Add missing hooks in the LTC2497 IIO driver to allow hwmon mapping.

Signed-off-by: Gaurav Gupta <gauragup@cisco.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/adc/ltc2497.c b/drivers/iio/adc/ltc2497.c
index 2691b10..5bf8011 100644 (file)
--- a/drivers/iio/adc/ltc2497.c
+++ b/drivers/iio/adc/ltc2497.c
@@ -11,6 +11,7 @@
 #include <linux/delay.h>
 #include <linux/i2c.h>
 #include <linux/iio/iio.h>
+#include <linux/iio/driver.h>
 #include <linux/iio/sysfs.h>
 #include <linux/module.h>
 #include <linux/of.h>
@@ -127,13 +128,14 @@ static int ltc2497_read_raw(struct iio_dev *indio_dev,
        }
 }
 
-#define LTC2497_CHAN(_chan, _addr) { \
+#define LTC2497_CHAN(_chan, _addr, _ds_name) { \
        .type = IIO_VOLTAGE, \
        .indexed = 1, \
        .channel = (_chan), \
        .address = (_addr | (_chan / 2) | ((_chan & 1) ? LTC2497_SIGN : 0)), \
        .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
        .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+       .datasheet_name = (_ds_name), \
 }
 
 #define LTC2497_CHAN_DIFF(_chan, _addr) { \
@@ -148,22 +150,22 @@ static int ltc2497_read_raw(struct iio_dev *indio_dev,
 }
 
 static const struct iio_chan_spec ltc2497_channel[] = {
-       LTC2497_CHAN(0, LTC2497_SGL),
-       LTC2497_CHAN(1, LTC2497_SGL),
-       LTC2497_CHAN(2, LTC2497_SGL),
-       LTC2497_CHAN(3, LTC2497_SGL),
-       LTC2497_CHAN(4, LTC2497_SGL),
-       LTC2497_CHAN(5, LTC2497_SGL),
-       LTC2497_CHAN(6, LTC2497_SGL),
-       LTC2497_CHAN(7, LTC2497_SGL),
-       LTC2497_CHAN(8, LTC2497_SGL),
-       LTC2497_CHAN(9, LTC2497_SGL),
-       LTC2497_CHAN(10, LTC2497_SGL),
-       LTC2497_CHAN(11, LTC2497_SGL),
-       LTC2497_CHAN(12, LTC2497_SGL),
-       LTC2497_CHAN(13, LTC2497_SGL),
-       LTC2497_CHAN(14, LTC2497_SGL),
-       LTC2497_CHAN(15, LTC2497_SGL),
+       LTC2497_CHAN(0, LTC2497_SGL, "CH0"),
+       LTC2497_CHAN(1, LTC2497_SGL, "CH1"),
+       LTC2497_CHAN(2, LTC2497_SGL, "CH2"),
+       LTC2497_CHAN(3, LTC2497_SGL, "CH3"),
+       LTC2497_CHAN(4, LTC2497_SGL, "CH4"),
+       LTC2497_CHAN(5, LTC2497_SGL, "CH5"),
+       LTC2497_CHAN(6, LTC2497_SGL, "CH6"),
+       LTC2497_CHAN(7, LTC2497_SGL, "CH7"),
+       LTC2497_CHAN(8, LTC2497_SGL, "CH8"),
+       LTC2497_CHAN(9, LTC2497_SGL, "CH9"),
+       LTC2497_CHAN(10, LTC2497_SGL, "CH10"),
+       LTC2497_CHAN(11, LTC2497_SGL, "CH11"),
+       LTC2497_CHAN(12, LTC2497_SGL, "CH12"),
+       LTC2497_CHAN(13, LTC2497_SGL, "CH13"),
+       LTC2497_CHAN(14, LTC2497_SGL, "CH14"),
+       LTC2497_CHAN(15, LTC2497_SGL, "CH15"),
        LTC2497_CHAN_DIFF(0, LTC2497_DIFF),
        LTC2497_CHAN_DIFF(1, LTC2497_DIFF),
        LTC2497_CHAN_DIFF(2, LTC2497_DIFF),
@@ -192,6 +194,7 @@ static int ltc2497_probe(struct i2c_client *client,
 {
        struct iio_dev *indio_dev;
        struct ltc2497_st *st;
+       struct iio_map *plat_data;
        int ret;
 
        if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
@@ -221,19 +224,31 @@ static int ltc2497_probe(struct i2c_client *client,
        if (ret < 0)
                return ret;
 
+       if (client->dev.platform_data) {
+               plat_data = ((struct iio_map *)client->dev.platform_data);
+               ret = iio_map_array_register(indio_dev, plat_data);
+               if (ret) {
+                       dev_err(&indio_dev->dev, "iio map err: %d\n", ret);
+                       goto err_regulator_disable;
+               }
+       }
+
        ret = i2c_smbus_write_byte(st->client, LTC2497_CONFIG_DEFAULT);
        if (ret < 0)
-               goto err_regulator_disable;
+               goto err_array_unregister;
 
        st->addr_prev = LTC2497_CONFIG_DEFAULT;
        st->time_prev = ktime_get();
 
        ret = iio_device_register(indio_dev);
        if (ret < 0)
-               goto err_regulator_disable;
+               goto err_array_unregister;
 
        return 0;
 
+err_array_unregister:
+       iio_map_array_unregister(indio_dev);
+
 err_regulator_disable:
        regulator_disable(st->ref);
 
@@ -245,6 +260,7 @@ static int ltc2497_remove(struct i2c_client *client)
        struct iio_dev *indio_dev = i2c_get_clientdata(client);
        struct ltc2497_st *st = iio_priv(indio_dev);
 
+       iio_map_array_unregister(indio_dev);
        iio_device_unregister(indio_dev);
        regulator_disable(st->ref);