Messages in this thread | | | Date | Thu, 10 Sep 2015 07:57:30 +0200 (CEST) | From | Julia Lawall <> | Subject | Re: [PATCH 5/6] Staging: iio: impedance-analyzer: Prefer using the BIT macro |
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On Thu, 10 Sep 2015, Shraddha Barke wrote:
> This patch replaces bit shifting on 1 with the BIT(x) macro > as it's extensively used by other function in this driver. > > This was done with coccinelle: > @@ int g; @@ > > -(1 << g) > +BIT(g)
This doesn't look like a good idea here, since there is a mixture of uses of BIT and other things for similar values.
julia
> Signed-off-by: Shraddha Barke <shraddha.6596@gmail.com> > --- > drivers/staging/iio/impedance-analyzer/ad5933.c | 22 +++++++++++----------- > 1 file changed, 11 insertions(+), 11 deletions(-) > > diff --git a/drivers/staging/iio/impedance-analyzer/ad5933.c b/drivers/staging/iio/impedance-analyzer/ad5933.c > index c18109c..48acad0 100644 > --- a/drivers/staging/iio/impedance-analyzer/ad5933.c > +++ b/drivers/staging/iio/impedance-analyzer/ad5933.c > @@ -39,7 +39,7 @@ > #define AD5933_REG_IMAG_DATA 0x96 /* R, 2 bytes*/ > > /* AD5933_REG_CONTROL_HB Bits */ > -#define AD5933_CTRL_INIT_START_FREQ (0x1 << 4) > +#define AD5933_CTRL_INIT_START_FREQ BIT(4) > #define AD5933_CTRL_START_SWEEP (0x2 << 4) > #define AD5933_CTRL_INC_FREQ (0x3 << 4) > #define AD5933_CTRL_REPEAT_FREQ (0x4 << 4) > @@ -48,23 +48,23 @@ > #define AD5933_CTRL_STANDBY (0xB << 4) > > #define AD5933_CTRL_RANGE_2000mVpp (0x0 << 1) > -#define AD5933_CTRL_RANGE_200mVpp (0x1 << 1) > +#define AD5933_CTRL_RANGE_200mVpp BIT(1) > #define AD5933_CTRL_RANGE_400mVpp (0x2 << 1) > #define AD5933_CTRL_RANGE_1000mVpp (0x3 << 1) > #define AD5933_CTRL_RANGE(x) ((x) << 1) > > -#define AD5933_CTRL_PGA_GAIN_1 (0x1 << 0) > +#define AD5933_CTRL_PGA_GAIN_1 BIT(0) > #define AD5933_CTRL_PGA_GAIN_5 (0x0 << 0) > > /* AD5933_REG_CONTROL_LB Bits */ > -#define AD5933_CTRL_RESET (0x1 << 4) > +#define AD5933_CTRL_RESET BIT(4) > #define AD5933_CTRL_INT_SYSCLK (0x0 << 3) > -#define AD5933_CTRL_EXT_SYSCLK (0x1 << 3) > +#define AD5933_CTRL_EXT_SYSCLK BIT(3) > > /* AD5933_REG_STATUS Bits */ > -#define AD5933_STAT_TEMP_VALID (0x1 << 0) > -#define AD5933_STAT_DATA_VALID (0x1 << 1) > -#define AD5933_STAT_SWEEP_DONE (0x1 << 2) > +#define AD5933_STAT_TEMP_VALID BIT(0) > +#define AD5933_STAT_DATA_VALID BIT(1) > +#define AD5933_STAT_SWEEP_DONE BIT(2) > > /* I2C Block Commands */ > #define AD5933_I2C_BLOCK_WRITE 0xA0 > @@ -222,7 +222,7 @@ static int ad5933_set_freq(struct ad5933_state *st, > u8 d8[4]; > } dat; > > - freqreg = (u64) freq * (u64) (1 << 27); > + freqreg = (u64) freq * (u64) BIT(27); > do_div(freqreg, st->mclk_hz / 4); > > switch (reg) { > @@ -308,7 +308,7 @@ static ssize_t ad5933_show_frequency(struct device *dev, > freqreg = be32_to_cpu(dat.d32) & 0xFFFFFF; > > freqreg = (u64) freqreg * (u64) (st->mclk_hz / 4); > - do_div(freqreg, 1 << 27); > + do_div(freqreg, BIT(27)); > > return sprintf(buf, "%d\n", (int) freqreg); > } > @@ -437,7 +437,7 @@ static ssize_t ad5933_store(struct device *dev, > > /* 2x, 4x handling, see datasheet */ > if (val > 511) > - val = (val >> 1) | (1 << 9); > + val = (val >> 1) | BIT(9); > else if (val > 1022) > val = (val >> 2) | (3 << 9); > > -- > 2.1.4 > >
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