| Message ID | 20230524000111.14370-1-gnstark@sberdevices.ru (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v1] meson saradc: add iio device attrib to switch channel 7 mux | expand |
On Wed, May 24, 2023 at 03:01:11AM +0300, George Stark wrote: > Patch adds two sysfs nodes: chan7_mux to set mux state > and chan7_mux_available to show available mux states. > Mux can be used to debug and calibrate adc by > switching and measuring well-known inputs like gnd, vdd etc. GND Vdd ... > +static ssize_t chan7_mux_store(struct device *dev, > + struct device_attribute *attr, > + const char *buf, size_t count) > +{ > + struct iio_dev *indio_dev = dev_to_iio_dev(dev); > + int i; > + > + for (i = 0; i < ARRAY_SIZE(chan7_vol); i++) > + if (!strcmp(chan7_vol[i], buf)) { > + meson_sar_adc_set_chan7_mux(indio_dev, i); > + return count; > + } > + > + return -EINVAL; NIH sysfs_match_string(). > +} ... > +static IIO_DEVICE_ATTR_RW(chan7_mux, -1); > +static IIO_DEVICE_ATTR_RO(chan7_mux_available, -1); Place each of them near to the respective callback(s), ... > +static struct attribute *meson_sar_adc_attrs[] = { > + &iio_dev_attr_chan7_mux_available.dev_attr.attr, > + &iio_dev_attr_chan7_mux.dev_attr.attr, > + NULL, No comma for the terminator entry. > +};
Hi Andy Thanks for review. I fixed it in patch v2 Best regards George On 5/27/23 11:21, Andy Shevchenko wrote: > On Wed, May 24, 2023 at 03:01:11AM +0300, George Stark wrote: >> Patch adds two sysfs nodes: chan7_mux to set mux state >> and chan7_mux_available to show available mux states. >> Mux can be used to debug and calibrate adc by >> switching and measuring well-known inputs like gnd, vdd etc. > GND > Vdd > > ... > >> +static ssize_t chan7_mux_store(struct device *dev, >> + struct device_attribute *attr, >> + const char *buf, size_t count) >> +{ >> + struct iio_dev *indio_dev = dev_to_iio_dev(dev); >> + int i; >> + >> + for (i = 0; i < ARRAY_SIZE(chan7_vol); i++) >> + if (!strcmp(chan7_vol[i], buf)) { >> + meson_sar_adc_set_chan7_mux(indio_dev, i); >> + return count; >> + } >> + >> + return -EINVAL; > NIH sysfs_match_string(). > >> +} > ... > >> +static IIO_DEVICE_ATTR_RW(chan7_mux, -1); >> +static IIO_DEVICE_ATTR_RO(chan7_mux_available, -1); > Place each of them near to the respective callback(s), > > ... > >> +static struct attribute *meson_sar_adc_attrs[] = { >> + &iio_dev_attr_chan7_mux_available.dev_attr.attr, >> + &iio_dev_attr_chan7_mux.dev_attr.attr, >> + NULL, > No comma for the terminator entry. > >> +};
diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c index e05e51900c35..77ef2b55f6f4 100644 --- a/drivers/iio/adc/meson_saradc.c +++ b/drivers/iio/adc/meson_saradc.c @@ -11,6 +11,7 @@ #include <linux/delay.h> #include <linux/io.h> #include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/nvmem-consumer.h> @@ -320,6 +321,7 @@ struct meson_sar_adc_priv { bool temperature_sensor_calibrated; u8 temperature_sensor_coefficient; u16 temperature_sensor_adc_val; + u8 chan7_mux_sel; }; static const struct regmap_config meson_sar_adc_regmap_config_gxbb = { @@ -483,6 +485,7 @@ static void meson_sar_adc_set_chan7_mux(struct iio_dev *indio_dev, regmap_update_bits(priv->regmap, MESON_SAR_ADC_REG3, MESON_SAR_ADC_REG3_CTRL_CHAN7_MUX_SEL_MASK, regval); + priv->chan7_mux_sel = sel; usleep_range(10, 20); } @@ -1130,8 +1133,71 @@ static int meson_sar_adc_calib(struct iio_dev *indio_dev) return ret; } +static const char * const chan7_vol[] = { + "gnd", + "vdd/4", + "vdd/2", + "vdd*3/4", + "vdd", + "ch7_input", +}; + +static ssize_t chan7_mux_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct meson_sar_adc_priv *priv = iio_priv(indio_dev); + unsigned int index = priv->chan7_mux_sel; + + if (index >= ARRAY_SIZE(chan7_vol)) + index = ARRAY_SIZE(chan7_vol) - 1; + + return sysfs_emit(buf, "%s\n", chan7_vol[index]); +} + +static ssize_t chan7_mux_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + int i; + + for (i = 0; i < ARRAY_SIZE(chan7_vol); i++) + if (!strcmp(chan7_vol[i], buf)) { + meson_sar_adc_set_chan7_mux(indio_dev, i); + return count; + } + + return -EINVAL; +} + +static ssize_t chan7_mux_available_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + int i, len = 0; + + for (i = 0; i < ARRAY_SIZE(chan7_vol); i++) + len += sysfs_emit_at(buf, len, "%s ", chan7_vol[i]); + + return len; +} + +static IIO_DEVICE_ATTR_RW(chan7_mux, -1); +static IIO_DEVICE_ATTR_RO(chan7_mux_available, -1); + +static struct attribute *meson_sar_adc_attrs[] = { + &iio_dev_attr_chan7_mux_available.dev_attr.attr, + &iio_dev_attr_chan7_mux.dev_attr.attr, + NULL, +}; + +static const struct attribute_group meson_sar_adc_attr_group = { + .attrs = meson_sar_adc_attrs, +}; + static const struct iio_info meson_sar_adc_iio_info = { .read_raw = meson_sar_adc_iio_info_read_raw, + .attrs = &meson_sar_adc_attr_group, }; static const struct meson_sar_adc_param meson_sar_adc_meson8_param = {
Patch adds two sysfs nodes: chan7_mux to set mux state and chan7_mux_available to show available mux states. Mux can be used to debug and calibrate adc by switching and measuring well-known inputs like gnd, vdd etc. Signed-off-by: George Stark <GNStark@sberdevices.ru> --- drivers/iio/adc/meson_saradc.c | 66 ++++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+)