iio:adc:ad799x: Drop I2C access helper functions

Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 26 insertions, 93 deletions

diff --git a/drivers/iio/adc/ad799x.c b/drivers/iio/adc/ad799x.c
index 6cf9ee18a216..34d93a5eefb1 100644
--- a/drivers/iio/adc/ad799x.c
+++ b/drivers/iio/adc/ad799x.c
@@ -175,65 +175,6 @@ out:
         return IRQ_HANDLED;
 }
 
-/*
- * ad799x register access by I2C
- */
-static int ad799x_i2c_read16(struct ad799x_state *st, u8 reg, u16 *data)
-{
-        struct i2c_client *client = st->client;
-        int ret = 0;
-
-        ret = i2c_smbus_read_word_swapped(client, reg);
-        if (ret < 0) {
-                dev_err(&client->dev, "I2C read error\n");
-                return ret;
-        }
-
-        *data = (u16)ret;
-
-        return 0;
-}
-
-static int ad799x_i2c_read8(struct ad799x_state *st, u8 reg, u8 *data)
-{
-        struct i2c_client *client = st->client;
-        int ret = 0;
-
-        ret = i2c_smbus_read_byte_data(client, reg);
-        if (ret < 0) {
-                dev_err(&client->dev, "I2C read error\n");
-                return ret;
-        }
-
-        *data = (u8)ret;
-
-        return 0;
-}
-
-static int ad799x_i2c_write16(struct ad799x_state *st, u8 reg, u16 data)
-{
-        struct i2c_client *client = st->client;
-        int ret = 0;
-
-        ret = i2c_smbus_write_word_swapped(client, reg, data);
-        if (ret < 0)
-                dev_err(&client->dev, "I2C write error\n");
-
-        return ret;
-}
-
-static int ad799x_i2c_write8(struct ad799x_state *st, u8 reg, u8 data)
-{
-        struct i2c_client *client = st->client;
-        int ret = 0;
-
-        ret = i2c_smbus_write_byte_data(client, reg, data);
-        if (ret < 0)
-                dev_err(&client->dev, "I2C write error\n");
-
-        return ret;
-}
-
 static int ad7997_8_update_scan_mode(struct iio_dev *indio_dev,
         const unsigned long *scan_mask)
 {
@@ -249,7 +190,7 @@ static int ad7997_8_update_scan_mode(struct iio_dev *indio_dev,
         switch (st->id) {
         case ad7997:
         case ad7998:
-                return ad799x_i2c_write16(st, AD7998_CONF_REG,
+                return i2c_smbus_write_word_swapped(st->client, AD7998_CONF_REG,
                         st->config | (*scan_mask << AD799X_CHANNEL_SHIFT));
         default:
                 break;
@@ -260,9 +201,7 @@ static int ad7997_8_update_scan_mode(struct iio_dev *indio_dev,
 
 static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
 {
-        u16 rxbuf;
         u8 cmd;
-        int ret;
 
         switch (st->id) {
         case ad7991:
@@ -283,11 +222,7 @@ static int ad799x_scan_direct(struct ad799x_state *st, unsigned ch)
                 return -EINVAL;
         }
 
-        ret = ad799x_i2c_read16(st, cmd, &rxbuf);
-        if (ret < 0)
-                return ret;
-
-        return rxbuf;
+        return i2c_smbus_read_word_swapped(st->client, cmd);
 }
 
 static int ad799x_read_raw(struct iio_dev *indio_dev,
@@ -332,6 +267,7 @@ static const unsigned int ad7998_frequencies[] = {
         [AD7998_CYC_TCONF_1024] = 488,
         [AD7998_CYC_TCONF_2048] = 244,
 };
+
 static ssize_t ad799x_read_frequency(struct device *dev,
                                         struct device_attribute *attr,
                                         char *buf)
@@ -339,15 +275,11 @@ static ssize_t ad799x_read_frequency(struct device *dev,
         struct iio_dev *indio_dev = dev_to_iio_dev(dev);
         struct ad799x_state *st = iio_priv(indio_dev);
 
-        int ret;
-        u8 val;
-        ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &val);
-        if (ret)
+        int ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
+        if (ret < 0)
                 return ret;
 
-        val &= AD7998_CYC_MASK;
-
-        return sprintf(buf, "%u\n", ad7998_frequencies[val]);
+        return sprintf(buf, "%u\n", ad7998_frequencies[ret & AD7998_CYC_MASK]);
 }
 
 static ssize_t ad799x_write_frequency(struct device *dev,
@@ -360,18 +292,17 @@ static ssize_t ad799x_write_frequency(struct device *dev,
 
         long val;
         int ret, i;
-        u8 t;
 
         ret = kstrtol(buf, 10, &val);
         if (ret)
                 return ret;
 
         mutex_lock(&indio_dev->mlock);
-        ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &t);
-        if (ret)
+        ret = i2c_smbus_read_byte_data(st->client, AD7998_CYCLE_TMR_REG);
+        if (ret < 0)
                 goto error_ret_mutex;
         /* Wipe the bits clean */
-        t &= ~AD7998_CYC_MASK;
+        ret &= ~AD7998_CYC_MASK;
 
         for (i = 0; i < ARRAY_SIZE(ad7998_frequencies); i++)
                 if (val == ad7998_frequencies[i])
@@ -380,13 +311,17 @@ static ssize_t ad799x_write_frequency(struct device *dev,
                 ret = -EINVAL;
                 goto error_ret_mutex;
         }
-        t |= i;
-        ret = ad799x_i2c_write8(st, AD7998_CYCLE_TMR_REG, t);
+
+        ret = i2c_smbus_write_byte_data(st->client, AD7998_CYCLE_TMR_REG,
+                ret | i);
+        if (ret < 0)
+                goto error_ret_mutex;
+        ret = len;
 
 error_ret_mutex:
         mutex_unlock(&indio_dev->mlock);
 
-        return ret ? ret : len;
+        return ret;
 }
 
 static int ad799x_read_event_config(struct iio_dev *indio_dev,
@@ -430,7 +365,8 @@ static int ad799x_write_event_value(struct iio_dev *indio_dev,
                 return -EINVAL;
 
         mutex_lock(&indio_dev->mlock);
-        ret = ad799x_i2c_write16(st, ad799x_threshold_reg(chan, dir, info),
+        ret = i2c_smbus_write_word_swapped(st->client,
+                ad799x_threshold_reg(chan, dir, info),
                 val << chan->scan_type.shift);
         mutex_unlock(&indio_dev->mlock);
 
@@ -446,15 +382,14 @@ static int ad799x_read_event_value(struct iio_dev *indio_dev,
 {
         int ret;
         struct ad799x_state *st = iio_priv(indio_dev);
-        u16 valin;
 
         mutex_lock(&indio_dev->mlock);
-        ret = ad799x_i2c_read16(st, ad799x_threshold_reg(chan, dir, info),
-                &valin);
+        ret = i2c_smbus_read_word_swapped(st->client,
+                ad799x_threshold_reg(chan, dir, info));
         mutex_unlock(&indio_dev->mlock);
         if (ret < 0)
                 return ret;
-        *val = (valin >> chan->scan_type.shift) &
+        *val = (ret >> chan->scan_type.shift) &
                 RES_MASK(chan->scan_type.realbits);
 
         return IIO_VAL_INT;
@@ -464,20 +399,18 @@ static irqreturn_t ad799x_event_handler(int irq, void *private)
 {
         struct iio_dev *indio_dev = private;
         struct ad799x_state *st = iio_priv(private);
-        u8 status;
         int i, ret;
 
-        ret = ad799x_i2c_read8(st, AD7998_ALERT_STAT_REG, &status);
-        if (ret)
+        ret = i2c_smbus_read_byte_data(st->client, AD7998_ALERT_STAT_REG);
+        if (ret <= 0)
                 goto done;
 
-        if (!status)
+        if (i2c_smbus_write_byte_data(st->client, AD7998_ALERT_STAT_REG,
+                AD7998_ALERT_STAT_CLEAR) < 0)
                 goto done;
 
-        ad799x_i2c_write8(st, AD7998_ALERT_STAT_REG, AD7998_ALERT_STAT_CLEAR);
-
         for (i = 0; i < 8; i++) {
-                if (status & (1 << i))
+                if (ret & (1 << i))
                         iio_push_event(indio_dev,
                                        i & 0x1 ?
                                        IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE,