diff options
Diffstat (limited to 'drivers/hwmon/ads7828.c')
| -rw-r--r-- | drivers/hwmon/ads7828.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/hwmon/ads7828.c b/drivers/hwmon/ads7828.c index b0ef66687816..898607bf682b 100644 --- a/drivers/hwmon/ads7828.c +++ b/drivers/hwmon/ads7828.c @@ -35,6 +35,7 @@ #include <linux/platform_data/ads7828.h> #include <linux/regmap.h> #include <linux/slab.h> +#include <linux/regulator/consumer.h> /* The ADS7828 registers */ #define ADS7828_CMD_SD_SE 0x80 /* Single ended inputs */ @@ -119,10 +120,12 @@ static int ads7828_probe(struct i2c_client *client, struct ads7828_data *data; struct device *hwmon_dev; unsigned int vref_mv = ADS7828_INT_VREF_MV; + unsigned int vref_uv; bool diff_input = false; bool ext_vref = false; unsigned int regval; enum ads7828_chips chip; + struct regulator *reg; data = devm_kzalloc(dev, sizeof(struct ads7828_data), GFP_KERNEL); if (!data) @@ -133,6 +136,18 @@ static int ads7828_probe(struct i2c_client *client, ext_vref = pdata->ext_vref; if (ext_vref && pdata->vref_mv) vref_mv = pdata->vref_mv; + } else if (dev->of_node) { + diff_input = of_property_read_bool(dev->of_node, + "ti,differential-input"); + reg = devm_regulator_get_optional(dev, "vref"); + if (!IS_ERR(reg)) { + vref_uv = regulator_get_voltage(reg); + vref_mv = DIV_ROUND_CLOSEST(vref_uv, 1000); + if (vref_mv < ADS7828_EXT_VREF_MV_MIN || + vref_mv > ADS7828_EXT_VREF_MV_MAX) + return -EINVAL; + ext_vref = true; + } } if (client->dev.of_node) |