From 1da0b9899abdbc7103d3ec6b1a888efda41dbb59 Mon Sep 17 00:00:00 2001 From: Srinivas Kandagatla Date: Tue, 26 Jan 2021 17:17:48 +0000 Subject: ASoC: soc-component: add snd_soc_component_read/write_field() It's often the case that we would write or read a particular field in register. With the current soc_component apis, reading a particular field in register would involve first read the register and then perform shift operations. Ex: to read from a field mask of 0xf0 val = snd_soc_component_read(component, reg); field = ((val & 0xf0) >> 0x4); This is sometimes prone to errors and code become less readable! With this new api we could just do field = snd_soc_component_read_field(component, reg, 0xf0); this makes it bit simple, easy to write and less error prone! This also applies to writing! There are various places in kernel which provides such field interfaces however soc_component seems to be missing this. This patch is inspired by FIELD_GET/FIELD_PREP macros in include/linux/bitfield.h Signed-off-by: Srinivas Kandagatla Link: https://lore.kernel.org/r/20210126171749.1863-1-srinivas.kandagatla@linaro.org Signed-off-by: Mark Brown --- sound/soc/soc-component.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) (limited to 'sound/soc/soc-component.c') diff --git a/sound/soc/soc-component.c b/sound/soc/soc-component.c index 760523382f3c..361a79d655e3 100644 --- a/sound/soc/soc-component.c +++ b/sound/soc/soc-component.c @@ -34,6 +34,18 @@ static inline int _soc_component_ret(struct snd_soc_component *component, return ret; } +static inline int soc_component_field_shift(struct snd_soc_component *component, + unsigned int mask) +{ + if (!mask) { + dev_err(component->dev, "ASoC: error field mask is zero for %s\n", + component->name); + return 0; + } + + return (__builtin_ffs(mask) - 1); +} + /* * We might want to check substream by using list. * In such case, we can update these macros. @@ -839,6 +851,47 @@ int snd_soc_component_update_bits_async(struct snd_soc_component *component, } EXPORT_SYMBOL_GPL(snd_soc_component_update_bits_async); +/** + * snd_soc_component_read_field() - Read register field value + * @component: Component to read from + * @reg: Register to read + * @mask: mask of the register field + * + * Return: read value of register field. + */ +unsigned int snd_soc_component_read_field(struct snd_soc_component *component, + unsigned int reg, unsigned int mask) +{ + unsigned int val; + + val = snd_soc_component_read(component, reg); + + val = (val & mask) >> soc_component_field_shift(component, mask); + + return val; +} +EXPORT_SYMBOL_GPL(snd_soc_component_read_field); + +/** + * snd_soc_component_write_field() - write to register field + * @component: Component to write to + * @reg: Register to write + * @mask: mask of the register field to update + * @val: value of the field to write + * + * Return: 1 for change, otherwise 0. + */ +int snd_soc_component_write_field(struct snd_soc_component *component, + unsigned int reg, unsigned int mask, + unsigned int val) +{ + + val = (val << soc_component_field_shift(component, mask)) & mask; + + return snd_soc_component_update_bits(component, reg, mask, val); +} +EXPORT_SYMBOL_GPL(snd_soc_component_write_field); + /** * snd_soc_component_async_complete() - Ensure asynchronous I/O has completed * @component: Component for which to wait -- cgit From 8ac9e476b86851c94e0f33bea758e0a00e3f875e Mon Sep 17 00:00:00 2001 From: Srinivas Kandagatla Date: Fri, 29 Jan 2021 10:05:39 +0000 Subject: ASoC: soc-component: fix undefined reference to __ffssi2 microblaze-linux-gcc (GCC) 9.3.0 complains about missing __ffssi2 symbol while using __builtin_ffs at runtime. This is because arch/h8300 is compiled with -fno-builtin option. so fallback and use kernel ffs() instead to all the arch builds happy! Fixes: 1da0b9899abd ("ASoC: soc-component: add snd_soc_component_read/write_field()") Reported-by: kernel test robot Signed-off-by: Srinivas Kandagatla Link: https://lore.kernel.org/r/20210129100539.23459-1-srinivas.kandagatla@linaro.org Signed-off-by: Mark Brown --- sound/soc/soc-component.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'sound/soc/soc-component.c') diff --git a/sound/soc/soc-component.c b/sound/soc/soc-component.c index 361a79d655e3..159bf88b9f8c 100644 --- a/sound/soc/soc-component.c +++ b/sound/soc/soc-component.c @@ -11,6 +11,7 @@ #include #include #include +#include #define soc_component_ret(dai, ret) _soc_component_ret(dai, __func__, ret) static inline int _soc_component_ret(struct snd_soc_component *component, @@ -43,7 +44,7 @@ static inline int soc_component_field_shift(struct snd_soc_component *component, return 0; } - return (__builtin_ffs(mask) - 1); + return (ffs(mask) - 1); } /* -- cgit