Signed-off-by: Peter Meerwald <pmeerw@xxxxxxxxxx>
---
drivers/iio/adc/ad799x.c | 119 +++++++++++------------------------------------
1 file changed, 26 insertions(+), 93 deletions(-)
diff --git a/drivers/iio/adc/ad799x.c b/drivers/iio/adc/ad799x.c
index 6cf9ee1..34d93a5 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,
--
1.9.1
--
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