[PATCH 3/5] iio: light: us5182d: Add functions for selectively enabling als and proximity

[Adriana Reus]

Keep track of the als and px enabled/disabled status in
order to enable them selectively.

Signed-off-by: Adriana Reus <adriana.r...@intel.com>
---
 drivers/iio/light/us5182d.c | 64 ++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 60 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/light/us5182d.c b/drivers/iio/light/us5182d.c
index 7993014..3d959f3 100644
--- a/drivers/iio/light/us5182d.c
+++ b/drivers/iio/light/us5182d.c
@@ -119,6 +119,9 @@ struct us5182d_data {
        u8 opmode;
        u8 power_mode;
 
+       bool als_enabled;
+       bool px_enabled;
+
        bool default_continuous;
 };
 
@@ -227,6 +230,48 @@ static int us5182d_set_opmode(struct us5182d_data *data, 
u8 mode)
        return 0;
 }
 
+static int us5182d_als_enable(struct us5182d_data *data)
+{
+       int ret;
+       u8 mode;
+
+       if (data->power_mode == US5182D_ONESHOT)
+               return us5182d_set_opmode(data, US5182D_ALS_ONLY);
+
+       if (data->als_enabled)
+               return 0;
+
+       mode = data->px_enabled ? US5182D_ALS_PX : US5182D_ALS_ONLY;
+
+       ret = us5182d_set_opmode(data, mode);
+       if (ret < 0)
+               return ret;
+
+       data->als_enabled = true;
+       return 0;
+}
+
+static int us5182d_px_enable(struct us5182d_data *data)
+{
+       int ret;
+       u8 mode;
+
+       if (data->power_mode == US5182D_ONESHOT)
+               return us5182d_set_opmode(data, US5182D_PX_ONLY);
+
+       if (data->px_enabled)
+               return 0;
+
+       mode = data->als_enabled ? US5182D_ALS_PX : US5182D_PX_ONLY;
+
+       ret = us5182d_set_opmode(data, mode);
+       if (ret < 0)
+               return ret;
+
+       data->px_enabled = true;
+       return 0;
+}
+
 static int us5182d_shutdown_en (struct us5182d_data *data, u8 state)
 {
        int ret;
@@ -241,7 +286,16 @@ static int us5182d_shutdown_en (struct us5182d_data *data, 
u8 state)
        ret = ret & ~US5182D_CFG0_SHUTDOWN_EN;
        ret = ret | state;
 
-       return i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret);
+       ret = i2c_smbus_write_byte_data(data->client, US5182D_REG_CFG0, ret);
+       if (ret < 0)
+               return ret;
+
+       if (state & US5182D_CFG0_SHUTDOWN_EN) {
+               data->als_enabled = false;
+               data->px_enabled = false;
+       }
+
+       return ret;
 }
 
 static int us5182d_read_raw(struct iio_dev *indio_dev,
@@ -261,7 +315,7 @@ static int us5182d_read_raw(struct iio_dev *indio_dev,
                                if (ret < 0)
                                        goto out_err;
                        }
-                       ret = us5182d_set_opmode(data, US5182D_OPMODE_ALS);
+                       ret = us5182d_als_enable(data);
                        if (ret < 0)
                                goto out_err;
 
@@ -278,7 +332,7 @@ static int us5182d_read_raw(struct iio_dev *indio_dev,
                                if (ret < 0)
                                        goto out_err;
                        }
-                       ret = us5182d_set_opmode(data, US5182D_OPMODE_PX);
+                       ret = us5182d_px_enable(data);
                        if (ret < 0)
                                goto out_err;
 
@@ -421,6 +475,9 @@ static int us5182d_init(struct iio_dev *indio_dev)
                        return ret;
        }
 
+       data->als_enabled = true;
+       data->px_enabled = true;
+
        if (!data->default_continuous) {
                ret = us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN);
                if (ret < 0)
@@ -428,7 +485,6 @@ static int us5182d_init(struct iio_dev *indio_dev)
                data->power_mode = US5182D_ONESHOT;
        }
 
-
        return ret;
 }
 
-- 
1.9.1

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