Introduce defines for shifting and mask under the config register for better readability. Also, introduce helper variables for index calculation.
Signed-off-by: Eva Rachel Retuya <eraret...@gmail.com> --- This patch might cause a conflict with this patch: staging: iio: cdc/ad7746: fix missing return value https://marc.info/?l=linux-driver-devel&m=147741283722806&w=2 I am waiting to rebase to the branch where this commit is present but I was told it was not yet pushed to kernel.org Changes in v3: * Make commit message more detailed. * Fix incorrect use of GENMASK. * Drop the AD7746_CONF_*FS(x) macros and use the mask and direct shifting where needed. * With the proper masks set, invert the AND'ng and shifting on the index calculations. Changes in v2: * Use GENMASK to generate both VTFS and CAPFS masks including offset, respectively. * Introduce helper variables for index calculation. drivers/staging/iio/cdc/ad7746.c | 38 ++++++++++++++++++++++---------------- 1 file changed, 22 insertions(+), 16 deletions(-) diff --git a/drivers/staging/iio/cdc/ad7746.c b/drivers/staging/iio/cdc/ad7746.c index f41251c..e97658a 100644 --- a/drivers/staging/iio/cdc/ad7746.c +++ b/drivers/staging/iio/cdc/ad7746.c @@ -70,8 +70,10 @@ #define AD7746_EXCSETUP_EXCLVL(x) (((x) & 0x3) << 0) /* Config Register Bit Designations (AD7746_REG_CFG) */ -#define AD7746_CONF_VTFS(x) ((x) << 6) -#define AD7746_CONF_CAPFS(x) ((x) << 3) +#define AD7746_CONF_VTFS_SHIFT 6 +#define AD7746_CONF_CAPFS_SHIFT 3 +#define AD7746_CONF_VTFS_MASK GENMASK(7, 6) +#define AD7746_CONF_CAPFS_MASK GENMASK(5, 3) #define AD7746_CONF_MODE_IDLE (0 << 0) #define AD7746_CONF_MODE_CONT_CONV (1 << 0) #define AD7746_CONF_MODE_SINGLE_CONV (2 << 0) @@ -217,15 +219,16 @@ static int ad7746_select_channel(struct iio_dev *indio_dev, struct iio_chan_spec const *chan) { struct ad7746_chip_info *chip = iio_priv(indio_dev); - int ret, delay; + int ret, delay, idx; u8 vt_setup, cap_setup; switch (chan->type) { case IIO_CAPACITANCE: cap_setup = (chan->address & 0xFF) | AD7746_CAPSETUP_CAPEN; vt_setup = chip->vt_setup & ~AD7746_VTSETUP_VTEN; - delay = ad7746_cap_filter_rate_table[(chip->config >> 3) & - 0x7][1]; + idx = (chip->config & AD7746_CONF_CAPFS_MASK) >> + AD7746_CONF_CAPFS_SHIFT; + delay = ad7746_cap_filter_rate_table[idx][1]; if (chip->capdac_set != chan->channel) { ret = i2c_smbus_write_byte_data(chip->client, @@ -246,8 +249,9 @@ static int ad7746_select_channel(struct iio_dev *indio_dev, case IIO_TEMP: vt_setup = (chan->address & 0xFF) | AD7746_VTSETUP_VTEN; cap_setup = chip->cap_setup & ~AD7746_CAPSETUP_CAPEN; - delay = ad7746_cap_filter_rate_table[(chip->config >> 6) & - 0x3][1]; + idx = (chip->config & AD7746_CONF_VTFS_MASK) >> + AD7746_CONF_VTFS_SHIFT; + delay = ad7746_cap_filter_rate_table[idx][1]; break; default: return -EINVAL; @@ -369,8 +373,8 @@ static int ad7746_store_cap_filter_rate_setup(struct ad7746_chip_info *chip, if (i >= ARRAY_SIZE(ad7746_cap_filter_rate_table)) i = ARRAY_SIZE(ad7746_cap_filter_rate_table) - 1; - chip->config &= ~AD7746_CONF_CAPFS(0x7); - chip->config |= AD7746_CONF_CAPFS(i); + chip->config &= ~AD7746_CONF_CAPFS_MASK; + chip->config |= i << AD7746_CONF_CAPFS_SHIFT; return 0; } @@ -387,8 +391,8 @@ static int ad7746_store_vt_filter_rate_setup(struct ad7746_chip_info *chip, if (i >= ARRAY_SIZE(ad7746_vt_filter_rate_table)) i = ARRAY_SIZE(ad7746_vt_filter_rate_table) - 1; - chip->config &= ~AD7746_CONF_VTFS(0x3); - chip->config |= AD7746_CONF_VTFS(i); + chip->config &= ~AD7746_CONF_VTFS_MASK; + chip->config |= i << AD7746_CONF_VTFS_SHIFT; return 0; } @@ -527,7 +531,7 @@ static int ad7746_read_raw(struct iio_dev *indio_dev, long mask) { struct ad7746_chip_info *chip = iio_priv(indio_dev); - int ret, delay; + int ret, delay, idx; u8 regval, reg; mutex_lock(&indio_dev->mlock); @@ -635,13 +639,15 @@ static int ad7746_read_raw(struct iio_dev *indio_dev, case IIO_CHAN_INFO_SAMP_FREQ: switch (chan->type) { case IIO_CAPACITANCE: - *val = ad7746_cap_filter_rate_table[ - (chip->config >> 3) & 0x7][0]; + idx = (chip->config & AD7746_CONF_CAPFS_MASK) >> + AD7746_CONF_CAPFS_SHIFT; + *val = ad7746_cap_filter_rate_table[idx][0]; ret = IIO_VAL_INT; break; case IIO_VOLTAGE: - *val = ad7746_vt_filter_rate_table[ - (chip->config >> 6) & 0x3][0]; + idx = (chip->config & AD7746_CONF_VTFS_MASK) >> + AD7746_CONF_VTFS_SHIFT; + *val = ad7746_vt_filter_rate_table[idx][0]; break; default: ret = -EINVAL; -- 2.7.4 _______________________________________________ devel mailing list de...@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
