mfd: twl4030-madc: Use twl_i2c_read/write_u16 for 16 bit registers

Simplify reading and writing of 16 bit TWL registers in the
driver by using twl_i2c_read_u16 and twl_i2c_write_u16.

Signed-off-by: Sebastian Reichel <sre@debian.org>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Tested-by: Marek Belisko <marek@goldelico.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/drivers/mfd/twl4030-madc.c b/drivers/mfd/twl4030-madc.c
index 98b9c98..8a014fb 100644 (file)
--- a/drivers/mfd/twl4030-madc.c
+++ b/drivers/mfd/twl4030-madc.c
@@ -205,25 +205,19 @@ const struct twl4030_madc_conversion_method twl4030_conversion_methods[] = {
  */
 static int twl4030_madc_channel_raw_read(struct twl4030_madc_data *madc, u8 reg)
 {
-       u8 msb, lsb;
+       u16 val;
        int ret;
        /*
         * For each ADC channel, we have MSB and LSB register pair. MSB address
         * is always LSB address+1. reg parameter is the address of LSB register
         */
-       ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &msb, reg + 1);
+       ret = twl_i2c_read_u16(TWL4030_MODULE_MADC, &val, reg);
        if (ret) {
-               dev_err(madc->dev, "unable to read MSB register 0x%X\n",
-                       reg + 1);
-               return ret;
-       }
-       ret = twl_i2c_read_u8(TWL4030_MODULE_MADC, &lsb, reg);
-       if (ret) {
-               dev_err(madc->dev, "unable to read LSB register 0x%X\n", reg);
+               dev_err(madc->dev, "unable to read register 0x%X\n", reg);
                return ret;
        }
 
-       return (int)(((msb << 8) | lsb) >> 6);
+       return (int)(val >> 6);
 }
 
 /*
@@ -572,7 +566,6 @@ static int twl4030_madc_wait_conversion_ready(struct twl4030_madc_data *madc,
 int twl4030_madc_conversion(struct twl4030_madc_request *req)
 {
        const struct twl4030_madc_conversion_method *method;
-       u8 ch_msb, ch_lsb;
        int ret;
 
        if (!req || !twl4030_madc)
@@ -588,37 +581,21 @@ int twl4030_madc_conversion(struct twl4030_madc_request *req)
                ret = -EBUSY;
                goto out;
        }
-       ch_msb = (req->channels >> 8) & 0xff;
-       ch_lsb = req->channels & 0xff;
        method = &twl4030_conversion_methods[req->method];
        /* Select channels to be converted */
-       ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, ch_msb, method->sel + 1);
+       ret = twl_i2c_write_u16(TWL4030_MODULE_MADC, req->channels, method->sel);
        if (ret) {
                dev_err(twl4030_madc->dev,
-                       "unable to write sel register 0x%X\n", method->sel + 1);
-               goto out;
-       }
-       ret = twl_i2c_write_u8(TWL4030_MODULE_MADC, ch_lsb, method->sel);
-       if (ret) {
-               dev_err(twl4030_madc->dev,
-                       "unable to write sel register 0x%X\n", method->sel + 1);
+                       "unable to write sel register 0x%X\n", method->sel);
                goto out;
        }
        /* Select averaging for all channels if do_avg is set */
        if (req->do_avg) {
-               ret = twl_i2c_write_u8(TWL4030_MODULE_MADC,
-                                      ch_msb, method->avg + 1);
+               ret = twl_i2c_write_u16(TWL4030_MODULE_MADC, req->channels,
+                                      method->avg);
                if (ret) {
                        dev_err(twl4030_madc->dev,
                                "unable to write avg register 0x%X\n",
-                               method->avg + 1);
-                       goto out;
-               }
-               ret = twl_i2c_write_u8(TWL4030_MODULE_MADC,
-                                      ch_lsb, method->avg);
-               if (ret) {
-                       dev_err(twl4030_madc->dev,
-                               "unable to write avg reg 0x%X\n",
                                method->avg);
                        goto out;
                }