| Message ID | ef830ce470a4f0f4be6040a776b6928bf89c0143.1512396054.git-series.quentin.schulz@free-electrons.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, 4 Dec 2017 15:12:48 +0100 Quentin Schulz <quentin.schulz@free-electrons.com> wrote: > The X-Powers AXP813 PMIC is really close to what is already done for > AXP20X/AXP22X. > > There are two pairs of bits to set the rate (one for Voltage and Current > measurements and one for TS/GPIO0 voltage measurements) instead of one. This would normally imply we need to split the device into two logical IIO devices. However, that only becomes relevant if we are using buffered output which this driver doesn't support. It'll be nasty to deal with this if we add that support down the line though. Up to you though as it's more likely to be your problem than anyone else's :) For now you could elect to support the different sampling frequencies if you wanted to but just providing controls for each channel. Given the driver doesn't currently expose these at all (I think) this is all rather immaterial ;) > > The register to set the ADC rates is different from the one for > AXP20X/AXP22X. > > GPIO0 can be used as an ADC (measuring Volts) unlike for AXP22X. > > The scales to apply to the different inputs are unlike the ones from > AXP20X and AXP22X. > > Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com> Looks good to me. Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> I'm assuming these will probably go via MFD.. Jonathan > --- > drivers/iio/adc/axp20x_adc.c | 122 ++++++++++++++++++++++++++++++++++++- > include/linux/mfd/axp20x.h | 2 +- > 2 files changed, 124 insertions(+) > > diff --git a/drivers/iio/adc/axp20x_adc.c b/drivers/iio/adc/axp20x_adc.c > index 7274f4f..03d489b 100644 > --- a/drivers/iio/adc/axp20x_adc.c > +++ b/drivers/iio/adc/axp20x_adc.c > @@ -35,8 +35,13 @@ > #define AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(x) (((x) & BIT(0)) << 1) > > #define AXP20X_ADC_RATE_MASK GENMASK(7, 6) > +#define AXP813_V_I_ADC_RATE_MASK GENMASK(5, 4) > +#define AXP813_ADC_RATE_MASK (AXP20X_ADC_RATE_MASK | AXP813_V_I_ADC_RATE_MASK) > #define AXP20X_ADC_RATE_HZ(x) ((ilog2((x) / 25) << 6) & AXP20X_ADC_RATE_MASK) > #define AXP22X_ADC_RATE_HZ(x) ((ilog2((x) / 100) << 6) & AXP20X_ADC_RATE_MASK) > +#define AXP813_TS_GPIO0_ADC_RATE_HZ(x) AXP20X_ADC_RATE_HZ(x) > +#define AXP813_V_I_ADC_RATE_HZ(x) ((ilog2((x) / 100) << 4) & AXP813_V_I_ADC_RATE_MASK) > +#define AXP813_ADC_RATE_HZ(x) (AXP20X_ADC_RATE_HZ(x) | AXP813_V_I_ADC_RATE_HZ(x)) > > #define AXP20X_ADC_CHANNEL(_channel, _name, _type, _reg) \ > { \ > @@ -95,6 +100,12 @@ enum axp22x_adc_channel_i { > AXP22X_BATT_DISCHRG_I, > }; > > +enum axp813_adc_channel_v { > + AXP813_TS_IN = 0, > + AXP813_GPIO0_V, > + AXP813_BATT_V, > +}; > + > static struct iio_map axp20x_maps[] = { > { > .consumer_dev_name = "axp20x-usb-power-supply", > @@ -197,6 +208,25 @@ static const struct iio_chan_spec axp22x_adc_channels[] = { > AXP20X_BATT_DISCHRG_I_H), > }; > > +static const struct iio_chan_spec axp813_adc_channels[] = { > + { > + .type = IIO_TEMP, > + .address = AXP22X_PMIC_TEMP_H, > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | > + BIT(IIO_CHAN_INFO_SCALE) | > + BIT(IIO_CHAN_INFO_OFFSET), > + .datasheet_name = "pmic_temp", > + }, > + AXP20X_ADC_CHANNEL(AXP813_GPIO0_V, "gpio0_v", IIO_VOLTAGE, > + AXP288_GP_ADC_H), > + AXP20X_ADC_CHANNEL(AXP813_BATT_V, "batt_v", IIO_VOLTAGE, > + AXP20X_BATT_V_H), > + AXP20X_ADC_CHANNEL(AXP22X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT, > + AXP20X_BATT_CHRG_I_H), > + AXP20X_ADC_CHANNEL(AXP22X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT, > + AXP20X_BATT_DISCHRG_I_H), > +}; > + > static int axp20x_adc_raw(struct iio_dev *indio_dev, > struct iio_chan_spec const *chan, int *val) > { > @@ -243,6 +273,18 @@ static int axp22x_adc_raw(struct iio_dev *indio_dev, > return IIO_VAL_INT; > } > > +static int axp813_adc_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, int *val) > +{ > + struct axp20x_adc_iio *info = iio_priv(indio_dev); > + > + *val = axp20x_read_variable_width(info->regmap, chan->address, 12); > + if (*val < 0) > + return *val; > + > + return IIO_VAL_INT; > +} > + > static int axp20x_adc_scale_voltage(int channel, int *val, int *val2) > { > switch (channel) { > @@ -273,6 +315,24 @@ static int axp20x_adc_scale_voltage(int channel, int *val, int *val2) > } > } > > +static int axp813_adc_scale_voltage(int channel, int *val, int *val2) > +{ > + switch (channel) { > + case AXP813_GPIO0_V: > + *val = 0; > + *val2 = 800000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + case AXP813_BATT_V: > + *val = 1; > + *val2 = 100000; > + return IIO_VAL_INT_PLUS_MICRO; > + > + default: > + return -EINVAL; > + } > +} > + > static int axp20x_adc_scale_current(int channel, int *val, int *val2) > { > switch (channel) { > @@ -342,6 +402,26 @@ static int axp22x_adc_scale(struct iio_chan_spec const *chan, int *val, > } > } > > +static int axp813_adc_scale(struct iio_chan_spec const *chan, int *val, > + int *val2) > +{ > + switch (chan->type) { > + case IIO_VOLTAGE: > + return axp813_adc_scale_voltage(chan->channel, val, val2); > + > + case IIO_CURRENT: > + *val = 1; > + return IIO_VAL_INT; > + > + case IIO_TEMP: > + *val = 100; > + return IIO_VAL_INT; > + > + default: > + return -EINVAL; > + } > +} > + > static int axp20x_adc_offset_voltage(struct iio_dev *indio_dev, int channel, > int *val) > { > @@ -425,6 +505,26 @@ static int axp22x_read_raw(struct iio_dev *indio_dev, > } > } > > +static int axp813_read_raw(struct iio_dev *indio_dev, > + struct iio_chan_spec const *chan, int *val, > + int *val2, long mask) > +{ > + switch (mask) { > + case IIO_CHAN_INFO_OFFSET: > + *val = -2667; > + return IIO_VAL_INT; > + > + case IIO_CHAN_INFO_SCALE: > + return axp813_adc_scale(chan, val, val2); > + > + case IIO_CHAN_INFO_RAW: > + return axp813_adc_raw(indio_dev, chan, val); > + > + default: > + return -EINVAL; > + } > +} > + > static int axp20x_write_raw(struct iio_dev *indio_dev, > struct iio_chan_spec const *chan, int val, int val2, > long mask) > @@ -470,6 +570,10 @@ static const struct iio_info axp22x_adc_iio_info = { > .read_raw = axp22x_read_raw, > }; > > +static const struct iio_info axp813_adc_iio_info = { > + .read_raw = axp813_read_raw, > +}; > + > static int axp20x_adc_rate(struct axp20x_adc_iio *info, int rate) > { > return regmap_update_bits(info->regmap, AXP20X_ADC_RATE, > @@ -484,6 +588,13 @@ static int axp22x_adc_rate(struct axp20x_adc_iio *info, int rate) > AXP22X_ADC_RATE_HZ(rate)); > } > > +static int axp813_adc_rate(struct axp20x_adc_iio *info, int rate) > +{ > + return regmap_update_bits(info->regmap, AXP813_ADC_RATE, > + AXP813_ADC_RATE_MASK, > + AXP813_ADC_RATE_HZ(rate)); > +} > + > struct axp_data { > const struct iio_info *iio_info; > int num_channels; > @@ -514,9 +625,20 @@ static const struct axp_data axp22x_data = { > .maps = axp22x_maps, > }; > > +static const struct axp_data axp813_data = { > + .iio_info = &axp813_adc_iio_info, > + .num_channels = ARRAY_SIZE(axp813_adc_channels), > + .channels = axp813_adc_channels, > + .adc_en1_mask = AXP22X_ADC_EN1_MASK, > + .adc_rate = axp813_adc_rate, > + .adc_en2 = false, > + .maps = axp22x_maps, > +}; > + > static const struct platform_device_id axp20x_adc_id_match[] = { > { .name = "axp20x-adc", .driver_data = (kernel_ulong_t)&axp20x_data, }, > { .name = "axp22x-adc", .driver_data = (kernel_ulong_t)&axp22x_data, }, > + { .name = "axp813-adc", .driver_data = (kernel_ulong_t)&axp813_data, }, > { /* sentinel */ }, > }; > MODULE_DEVICE_TABLE(platform, axp20x_adc_id_match); > diff --git a/include/linux/mfd/axp20x.h b/include/linux/mfd/axp20x.h > index 78dc853..ff95414 100644 > --- a/include/linux/mfd/axp20x.h > +++ b/include/linux/mfd/axp20x.h > @@ -266,6 +266,8 @@ enum axp20x_variants { > #define AXP288_RT_BATT_V_H 0xa0 > #define AXP288_RT_BATT_V_L 0xa1 > > +#define AXP813_ADC_RATE 0x85 > + > /* Fuel Gauge */ > #define AXP288_FG_RDC1_REG 0xba > #define AXP288_FG_RDC0_REG 0xbb
Hi Jonathan, On 10/12/2017 17:36, Jonathan Cameron wrote: > On Mon, 4 Dec 2017 15:12:48 +0100 > Quentin Schulz <quentin.schulz@free-electrons.com> wrote: > >> The X-Powers AXP813 PMIC is really close to what is already done for >> AXP20X/AXP22X. >> >> There are two pairs of bits to set the rate (one for Voltage and Current >> measurements and one for TS/GPIO0 voltage measurements) instead of one. > > This would normally imply we need to split the device into two logical > IIO devices. However, that only becomes relevant if we are using > buffered output which this driver doesn't support. > > It'll be nasty to deal with this if we add that support down the line > though. Up to you though as it's more likely to be your problem than > anyone else's :) > I have no plans for supporting buffered output for the AXPs at the moment. But that's an interesting (and important) limitation to raise. Wouldn't be more of a hack to have two IIO devices representing the actual same IP? > For now you could elect to support the different sampling frequencies > if you wanted to but just providing controls for each channel. > I guess that you're offering to use IIO_CHAN_INFO_SAMP_FREQ in info_mask_separate for each channel? > Given the driver doesn't currently expose these at all (I think) > this is all rather immaterial ;) I'm not giving the user the option to chose the sampling frequency for now. I have no plans to do it either, but I think it would be rather simple to later add support for setting frequency sampling since we only need to add a sysfs entry (with IIO_CHAN_INFO_SAMP_FREQ) that does not exist yet. Don't you think? Am I missing something? Thanks, Quentin
On Mon, 11 Dec 2017 09:18:55 +0100 Quentin Schulz <quentin.schulz@free-electrons.com> wrote: > Hi Jonathan, > > On 10/12/2017 17:36, Jonathan Cameron wrote: > > On Mon, 4 Dec 2017 15:12:48 +0100 > > Quentin Schulz <quentin.schulz@free-electrons.com> wrote: > > > >> The X-Powers AXP813 PMIC is really close to what is already done for > >> AXP20X/AXP22X. > >> > >> There are two pairs of bits to set the rate (one for Voltage and Current > >> measurements and one for TS/GPIO0 voltage measurements) instead of one. > > > > This would normally imply we need to split the device into two logical > > IIO devices. However, that only becomes relevant if we are using > > buffered output which this driver doesn't support. > > > It'll be nasty to deal with this if we add that support down the line > > though. Up to you though as it's more likely to be your problem than > > anyone else's :) > > > > I have no plans for supporting buffered output for the AXPs at the > moment. But that's an interesting (and important) limitation to raise. > Wouldn't be more of a hack to have two IIO devices representing the > actual same IP? We have thought about allowing multiple buffers from a single IIO device but that makes for some horrible changes to the ABI - so as things stand the only option is two devices for one IP. Ultimately they aren't really two devices - in the same way we have triggers separating registered on the IIO bus (often many of them). Just two different elements of the same IP. > > > For now you could elect to support the different sampling frequencies > > if you wanted to but just providing controls for each channel. > > > > I guess that you're offering to use IIO_CHAN_INFO_SAMP_FREQ in > info_mask_separate for each channel? Yes > > > Given the driver doesn't currently expose these at all (I think) > > this is all rather immaterial ;) > > I'm not giving the user the option to chose the sampling frequency for > now. I have no plans to do it either, but I think it would be rather > simple to later add support for setting frequency sampling since we only > need to add a sysfs entry (with IIO_CHAN_INFO_SAMP_FREQ) that does not > exist yet. Don't you think? Am I missing something? No should be straight forward as long as we keep clear of the buffered interfaces with their limitations. > > Thanks, > Quentin
diff --git a/drivers/iio/adc/axp20x_adc.c b/drivers/iio/adc/axp20x_adc.c index 7274f4f..03d489b 100644 --- a/drivers/iio/adc/axp20x_adc.c +++ b/drivers/iio/adc/axp20x_adc.c @@ -35,8 +35,13 @@ #define AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(x) (((x) & BIT(0)) << 1) #define AXP20X_ADC_RATE_MASK GENMASK(7, 6) +#define AXP813_V_I_ADC_RATE_MASK GENMASK(5, 4) +#define AXP813_ADC_RATE_MASK (AXP20X_ADC_RATE_MASK | AXP813_V_I_ADC_RATE_MASK) #define AXP20X_ADC_RATE_HZ(x) ((ilog2((x) / 25) << 6) & AXP20X_ADC_RATE_MASK) #define AXP22X_ADC_RATE_HZ(x) ((ilog2((x) / 100) << 6) & AXP20X_ADC_RATE_MASK) +#define AXP813_TS_GPIO0_ADC_RATE_HZ(x) AXP20X_ADC_RATE_HZ(x) +#define AXP813_V_I_ADC_RATE_HZ(x) ((ilog2((x) / 100) << 4) & AXP813_V_I_ADC_RATE_MASK) +#define AXP813_ADC_RATE_HZ(x) (AXP20X_ADC_RATE_HZ(x) | AXP813_V_I_ADC_RATE_HZ(x)) #define AXP20X_ADC_CHANNEL(_channel, _name, _type, _reg) \ { \ @@ -95,6 +100,12 @@ enum axp22x_adc_channel_i { AXP22X_BATT_DISCHRG_I, }; +enum axp813_adc_channel_v { + AXP813_TS_IN = 0, + AXP813_GPIO0_V, + AXP813_BATT_V, +}; + static struct iio_map axp20x_maps[] = { { .consumer_dev_name = "axp20x-usb-power-supply", @@ -197,6 +208,25 @@ static const struct iio_chan_spec axp22x_adc_channels[] = { AXP20X_BATT_DISCHRG_I_H), }; +static const struct iio_chan_spec axp813_adc_channels[] = { + { + .type = IIO_TEMP, + .address = AXP22X_PMIC_TEMP_H, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_OFFSET), + .datasheet_name = "pmic_temp", + }, + AXP20X_ADC_CHANNEL(AXP813_GPIO0_V, "gpio0_v", IIO_VOLTAGE, + AXP288_GP_ADC_H), + AXP20X_ADC_CHANNEL(AXP813_BATT_V, "batt_v", IIO_VOLTAGE, + AXP20X_BATT_V_H), + AXP20X_ADC_CHANNEL(AXP22X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT, + AXP20X_BATT_CHRG_I_H), + AXP20X_ADC_CHANNEL(AXP22X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT, + AXP20X_BATT_DISCHRG_I_H), +}; + static int axp20x_adc_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val) { @@ -243,6 +273,18 @@ static int axp22x_adc_raw(struct iio_dev *indio_dev, return IIO_VAL_INT; } +static int axp813_adc_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val) +{ + struct axp20x_adc_iio *info = iio_priv(indio_dev); + + *val = axp20x_read_variable_width(info->regmap, chan->address, 12); + if (*val < 0) + return *val; + + return IIO_VAL_INT; +} + static int axp20x_adc_scale_voltage(int channel, int *val, int *val2) { switch (channel) { @@ -273,6 +315,24 @@ static int axp20x_adc_scale_voltage(int channel, int *val, int *val2) } } +static int axp813_adc_scale_voltage(int channel, int *val, int *val2) +{ + switch (channel) { + case AXP813_GPIO0_V: + *val = 0; + *val2 = 800000; + return IIO_VAL_INT_PLUS_MICRO; + + case AXP813_BATT_V: + *val = 1; + *val2 = 100000; + return IIO_VAL_INT_PLUS_MICRO; + + default: + return -EINVAL; + } +} + static int axp20x_adc_scale_current(int channel, int *val, int *val2) { switch (channel) { @@ -342,6 +402,26 @@ static int axp22x_adc_scale(struct iio_chan_spec const *chan, int *val, } } +static int axp813_adc_scale(struct iio_chan_spec const *chan, int *val, + int *val2) +{ + switch (chan->type) { + case IIO_VOLTAGE: + return axp813_adc_scale_voltage(chan->channel, val, val2); + + case IIO_CURRENT: + *val = 1; + return IIO_VAL_INT; + + case IIO_TEMP: + *val = 100; + return IIO_VAL_INT; + + default: + return -EINVAL; + } +} + static int axp20x_adc_offset_voltage(struct iio_dev *indio_dev, int channel, int *val) { @@ -425,6 +505,26 @@ static int axp22x_read_raw(struct iio_dev *indio_dev, } } +static int axp813_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, + int *val2, long mask) +{ + switch (mask) { + case IIO_CHAN_INFO_OFFSET: + *val = -2667; + return IIO_VAL_INT; + + case IIO_CHAN_INFO_SCALE: + return axp813_adc_scale(chan, val, val2); + + case IIO_CHAN_INFO_RAW: + return axp813_adc_raw(indio_dev, chan, val); + + default: + return -EINVAL; + } +} + static int axp20x_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) @@ -470,6 +570,10 @@ static const struct iio_info axp22x_adc_iio_info = { .read_raw = axp22x_read_raw, }; +static const struct iio_info axp813_adc_iio_info = { + .read_raw = axp813_read_raw, +}; + static int axp20x_adc_rate(struct axp20x_adc_iio *info, int rate) { return regmap_update_bits(info->regmap, AXP20X_ADC_RATE, @@ -484,6 +588,13 @@ static int axp22x_adc_rate(struct axp20x_adc_iio *info, int rate) AXP22X_ADC_RATE_HZ(rate)); } +static int axp813_adc_rate(struct axp20x_adc_iio *info, int rate) +{ + return regmap_update_bits(info->regmap, AXP813_ADC_RATE, + AXP813_ADC_RATE_MASK, + AXP813_ADC_RATE_HZ(rate)); +} + struct axp_data { const struct iio_info *iio_info; int num_channels; @@ -514,9 +625,20 @@ static const struct axp_data axp22x_data = { .maps = axp22x_maps, }; +static const struct axp_data axp813_data = { + .iio_info = &axp813_adc_iio_info, + .num_channels = ARRAY_SIZE(axp813_adc_channels), + .channels = axp813_adc_channels, + .adc_en1_mask = AXP22X_ADC_EN1_MASK, + .adc_rate = axp813_adc_rate, + .adc_en2 = false, + .maps = axp22x_maps, +}; + static const struct platform_device_id axp20x_adc_id_match[] = { { .name = "axp20x-adc", .driver_data = (kernel_ulong_t)&axp20x_data, }, { .name = "axp22x-adc", .driver_data = (kernel_ulong_t)&axp22x_data, }, + { .name = "axp813-adc", .driver_data = (kernel_ulong_t)&axp813_data, }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(platform, axp20x_adc_id_match); diff --git a/include/linux/mfd/axp20x.h b/include/linux/mfd/axp20x.h index 78dc853..ff95414 100644 --- a/include/linux/mfd/axp20x.h +++ b/include/linux/mfd/axp20x.h @@ -266,6 +266,8 @@ enum axp20x_variants { #define AXP288_RT_BATT_V_H 0xa0 #define AXP288_RT_BATT_V_L 0xa1 +#define AXP813_ADC_RATE 0x85 + /* Fuel Gauge */ #define AXP288_FG_RDC1_REG 0xba #define AXP288_FG_RDC0_REG 0xbb
The X-Powers AXP813 PMIC is really close to what is already done for AXP20X/AXP22X. There are two pairs of bits to set the rate (one for Voltage and Current measurements and one for TS/GPIO0 voltage measurements) instead of one. The register to set the ADC rates is different from the one for AXP20X/AXP22X. GPIO0 can be used as an ADC (measuring Volts) unlike for AXP22X. The scales to apply to the different inputs are unlike the ones from AXP20X and AXP22X. Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com> --- drivers/iio/adc/axp20x_adc.c | 122 ++++++++++++++++++++++++++++++++++++- include/linux/mfd/axp20x.h | 2 +- 2 files changed, 124 insertions(+)