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author | Peter Meerwald <pmeerw@pmeerw.net> | 2014-12-06 05:54:00 (GMT) |
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committer | Jonathan Cameron <jic23@kernel.org> | 2014-07-13 20:46:54 (GMT) |
commit | 541544712ea9f1f4511ecc1ec7dcabf6ce042909 (patch) | |
tree | fcc1df5d258d48dfa04d80675ca75fdc25e29582 /drivers/iio/adc/ad799x.c | |
parent | db7c17ecbf4d6328597047c4e4d6e8914945477c (diff) | |
download | linux-541544712ea9f1f4511ecc1ec7dcabf6ce042909.tar.xz |
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>
Diffstat (limited to 'drivers/iio/adc/ad799x.c')
-rw-r--r-- | drivers/iio/adc/ad799x.c | 119 |
1 files 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, |