diff options
Diffstat (limited to 'drivers/iio/adc/axp20x_adc.c')
| -rw-r--r-- | drivers/iio/adc/axp20x_adc.c | 617 |
1 files changed, 617 insertions, 0 deletions
diff --git a/drivers/iio/adc/axp20x_adc.c b/drivers/iio/adc/axp20x_adc.c new file mode 100644 index 000000000000..11e177180ea0 --- /dev/null +++ b/drivers/iio/adc/axp20x_adc.c @@ -0,0 +1,617 @@ +/* ADC driver for AXP20X and AXP22X PMICs + * + * Copyright (c) 2016 Free Electrons NextThing Co. + * Quentin Schulz <quentin.schulz@free-electrons.com> + * + * This program is free software; you can redistribute it and/or modify it under + * the terms of the GNU General Public License version 2 as published by the + * Free Software Foundation. + */ + +#include <linux/completion.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/regmap.h> +#include <linux/thermal.h> + +#include <linux/iio/iio.h> +#include <linux/iio/driver.h> +#include <linux/iio/machine.h> +#include <linux/mfd/axp20x.h> + +#define AXP20X_ADC_EN1_MASK GENMASK(7, 0) + +#define AXP20X_ADC_EN2_MASK (GENMASK(3, 2) | BIT(7)) +#define AXP22X_ADC_EN1_MASK (GENMASK(7, 5) | BIT(0)) + +#define AXP20X_GPIO10_IN_RANGE_GPIO0 BIT(0) +#define AXP20X_GPIO10_IN_RANGE_GPIO1 BIT(1) +#define AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(x) ((x) & BIT(0)) +#define AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(x) (((x) & BIT(0)) << 1) + +#define AXP20X_ADC_RATE_MASK GENMASK(7, 6) +#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 AXP20X_ADC_CHANNEL(_channel, _name, _type, _reg) \ + { \ + .type = _type, \ + .indexed = 1, \ + .channel = _channel, \ + .address = _reg, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_SCALE), \ + .datasheet_name = _name, \ + } + +#define AXP20X_ADC_CHANNEL_OFFSET(_channel, _name, _type, _reg) \ + { \ + .type = _type, \ + .indexed = 1, \ + .channel = _channel, \ + .address = _reg, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_SCALE) |\ + BIT(IIO_CHAN_INFO_OFFSET),\ + .datasheet_name = _name, \ + } + +struct axp_data; + +struct axp20x_adc_iio { + struct regmap *regmap; + struct axp_data *data; +}; + +enum axp20x_adc_channel_v { + AXP20X_ACIN_V = 0, + AXP20X_VBUS_V, + AXP20X_TS_IN, + AXP20X_GPIO0_V, + AXP20X_GPIO1_V, + AXP20X_IPSOUT_V, + AXP20X_BATT_V, +}; + +enum axp20x_adc_channel_i { + AXP20X_ACIN_I = 0, + AXP20X_VBUS_I, + AXP20X_BATT_CHRG_I, + AXP20X_BATT_DISCHRG_I, +}; + +enum axp22x_adc_channel_v { + AXP22X_TS_IN = 0, + AXP22X_BATT_V, +}; + +enum axp22x_adc_channel_i { + AXP22X_BATT_CHRG_I = 1, + AXP22X_BATT_DISCHRG_I, +}; + +static struct iio_map axp20x_maps[] = { + { + .consumer_dev_name = "axp20x-usb-power-supply", + .consumer_channel = "vbus_v", + .adc_channel_label = "vbus_v", + }, { + .consumer_dev_name = "axp20x-usb-power-supply", + .consumer_channel = "vbus_i", + .adc_channel_label = "vbus_i", + }, { + .consumer_dev_name = "axp20x-ac-power-supply", + .consumer_channel = "acin_v", + .adc_channel_label = "acin_v", + }, { + .consumer_dev_name = "axp20x-ac-power-supply", + .consumer_channel = "acin_i", + .adc_channel_label = "acin_i", + }, { + .consumer_dev_name = "axp20x-battery-power-supply", + .consumer_channel = "batt_v", + .adc_channel_label = "batt_v", + }, { + .consumer_dev_name = "axp20x-battery-power-supply", + .consumer_channel = "batt_chrg_i", + .adc_channel_label = "batt_chrg_i", + }, { + .consumer_dev_name = "axp20x-battery-power-supply", + .consumer_channel = "batt_dischrg_i", + .adc_channel_label = "batt_dischrg_i", + }, { /* sentinel */ } +}; + +static struct iio_map axp22x_maps[] = { + { + .consumer_dev_name = "axp20x-battery-power-supply", + .consumer_channel = "batt_v", + .adc_channel_label = "batt_v", + }, { + .consumer_dev_name = "axp20x-battery-power-supply", + .consumer_channel = "batt_chrg_i", + .adc_channel_label = "batt_chrg_i", + }, { + .consumer_dev_name = "axp20x-battery-power-supply", + .consumer_channel = "batt_dischrg_i", + .adc_channel_label = "batt_dischrg_i", + }, { /* sentinel */ } +}; + +/* + * Channels are mapped by physical system. Their channels share the same index. + * i.e. acin_i is in_current0_raw and acin_v is in_voltage0_raw. + * The only exception is for the battery. batt_v will be in_voltage6_raw and + * charge current in_current6_raw and discharge current will be in_current7_raw. + */ +static const struct iio_chan_spec axp20x_adc_channels[] = { + AXP20X_ADC_CHANNEL(AXP20X_ACIN_V, "acin_v", IIO_VOLTAGE, + AXP20X_ACIN_V_ADC_H), + AXP20X_ADC_CHANNEL(AXP20X_ACIN_I, "acin_i", IIO_CURRENT, + AXP20X_ACIN_I_ADC_H), + AXP20X_ADC_CHANNEL(AXP20X_VBUS_V, "vbus_v", IIO_VOLTAGE, + AXP20X_VBUS_V_ADC_H), + AXP20X_ADC_CHANNEL(AXP20X_VBUS_I, "vbus_i", IIO_CURRENT, + AXP20X_VBUS_I_ADC_H), + { + .type = IIO_TEMP, + .address = AXP20X_TEMP_ADC_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_OFFSET(AXP20X_GPIO0_V, "gpio0_v", IIO_VOLTAGE, + AXP20X_GPIO0_V_ADC_H), + AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO1_V, "gpio1_v", IIO_VOLTAGE, + AXP20X_GPIO1_V_ADC_H), + AXP20X_ADC_CHANNEL(AXP20X_IPSOUT_V, "ipsout_v", IIO_VOLTAGE, + AXP20X_IPSOUT_V_HIGH_H), + AXP20X_ADC_CHANNEL(AXP20X_BATT_V, "batt_v", IIO_VOLTAGE, + AXP20X_BATT_V_H), + AXP20X_ADC_CHANNEL(AXP20X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT, + AXP20X_BATT_CHRG_I_H), + AXP20X_ADC_CHANNEL(AXP20X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT, + AXP20X_BATT_DISCHRG_I_H), +}; + +static const struct iio_chan_spec axp22x_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(AXP22X_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) +{ + struct axp20x_adc_iio *info = iio_priv(indio_dev); + int size = 12; + + /* + * N.B.: Unlike the Chinese datasheets tell, the charging current is + * stored on 12 bits, not 13 bits. Only discharging current is on 13 + * bits. + */ + if (chan->type == IIO_CURRENT && chan->channel == AXP20X_BATT_DISCHRG_I) + size = 13; + else + size = 12; + + *val = axp20x_read_variable_width(info->regmap, chan->address, size); + if (*val < 0) + return *val; + + return IIO_VAL_INT; +} + +static int axp22x_adc_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val) +{ + struct axp20x_adc_iio *info = iio_priv(indio_dev); + int size; + + /* + * N.B.: Unlike the Chinese datasheets tell, the charging current is + * stored on 12 bits, not 13 bits. Only discharging current is on 13 + * bits. + */ + if (chan->type == IIO_CURRENT && chan->channel == AXP22X_BATT_DISCHRG_I) + size = 13; + else + size = 12; + + *val = axp20x_read_variable_width(info->regmap, chan->address, size); + if (*val < 0) + return *val; + + return IIO_VAL_INT; +} + +static int axp20x_adc_scale_voltage(int channel, int *val, int *val2) +{ + switch (channel) { + case AXP20X_ACIN_V: + case AXP20X_VBUS_V: + *val = 1; + *val2 = 700000; + return IIO_VAL_INT_PLUS_MICRO; + + case AXP20X_GPIO0_V: + case AXP20X_GPIO1_V: + *val = 0; + *val2 = 500000; + return IIO_VAL_INT_PLUS_MICRO; + + case AXP20X_BATT_V: + *val = 1; + *val2 = 100000; + return IIO_VAL_INT_PLUS_MICRO; + + case AXP20X_IPSOUT_V: + *val = 1; + *val2 = 400000; + return IIO_VAL_INT_PLUS_MICRO; + + default: + return -EINVAL; + } +} + +static int axp20x_adc_scale_current(int channel, int *val, int *val2) +{ + switch (channel) { + case AXP20X_ACIN_I: + *val = 0; + *val2 = 625000; + return IIO_VAL_INT_PLUS_MICRO; + + case AXP20X_VBUS_I: + *val = 0; + *val2 = 375000; + return IIO_VAL_INT_PLUS_MICRO; + + case AXP20X_BATT_DISCHRG_I: + case AXP20X_BATT_CHRG_I: + *val = 0; + *val2 = 500000; + return IIO_VAL_INT_PLUS_MICRO; + + default: + return -EINVAL; + } +} + +static int axp20x_adc_scale(struct iio_chan_spec const *chan, int *val, + int *val2) +{ + switch (chan->type) { + case IIO_VOLTAGE: + return axp20x_adc_scale_voltage(chan->channel, val, val2); + + case IIO_CURRENT: + return axp20x_adc_scale_current(chan->channel, val, val2); + + case IIO_TEMP: + *val = 100; + return IIO_VAL_INT; + + default: + return -EINVAL; + } +} + +static int axp22x_adc_scale(struct iio_chan_spec const *chan, int *val, + int *val2) +{ + switch (chan->type) { + case IIO_VOLTAGE: + if (chan->channel != AXP22X_BATT_V) + return -EINVAL; + + *val = 1; + *val2 = 100000; + return IIO_VAL_INT_PLUS_MICRO; + + case IIO_CURRENT: + *val = 0; + *val2 = 500000; + return IIO_VAL_INT_PLUS_MICRO; + + 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) +{ + struct axp20x_adc_iio *info = iio_priv(indio_dev); + int ret; + + ret = regmap_read(info->regmap, AXP20X_GPIO10_IN_RANGE, val); + if (ret < 0) + return ret; + + switch (channel) { + case AXP20X_GPIO0_V: + *val &= AXP20X_GPIO10_IN_RANGE_GPIO0; + break; + + case AXP20X_GPIO1_V: + *val &= AXP20X_GPIO10_IN_RANGE_GPIO1; + break; + + default: + return -EINVAL; + } + + *val = !!(*val) * 700000; + + return IIO_VAL_INT; +} + +static int axp20x_adc_offset(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val) +{ + switch (chan->type) { + case IIO_VOLTAGE: + return axp20x_adc_offset_voltage(indio_dev, chan->channel, val); + + case IIO_TEMP: + *val = -1447; + return IIO_VAL_INT; + + default: + return -EINVAL; + } +} + +static int axp20x_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: + return axp20x_adc_offset(indio_dev, chan, val); + + case IIO_CHAN_INFO_SCALE: + return axp20x_adc_scale(chan, val, val2); + + case IIO_CHAN_INFO_RAW: + return axp20x_adc_raw(indio_dev, chan, val); + + default: + return -EINVAL; + } +} + +static int axp22x_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 = -2677; + return IIO_VAL_INT; + + case IIO_CHAN_INFO_SCALE: + return axp22x_adc_scale(chan, val, val2); + + case IIO_CHAN_INFO_RAW: + return axp22x_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) +{ + struct axp20x_adc_iio *info = iio_priv(indio_dev); + unsigned int reg, regval; + + /* + * The AXP20X PMIC allows the user to choose between 0V and 0.7V offsets + * for (independently) GPIO0 and GPIO1 when in ADC mode. + */ + if (mask != IIO_CHAN_INFO_OFFSET) + return -EINVAL; + + if (val != 0 && val != 700000) + return -EINVAL; + + switch (chan->channel) { + case AXP20X_GPIO0_V: + reg = AXP20X_GPIO10_IN_RANGE_GPIO0; + regval = AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(!!val); + break; + + case AXP20X_GPIO1_V: + reg = AXP20X_GPIO10_IN_RANGE_GPIO1; + regval = AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(!!val); + break; + + default: + return -EINVAL; + } + + return regmap_update_bits(info->regmap, AXP20X_GPIO10_IN_RANGE, reg, + regval); +} + +static const struct iio_info axp20x_adc_iio_info = { + .read_raw = axp20x_read_raw, + .write_raw = axp20x_write_raw, + .driver_module = THIS_MODULE, +}; + +static const struct iio_info axp22x_adc_iio_info = { + .read_raw = axp22x_read_raw, + .driver_module = THIS_MODULE, +}; + +static int axp20x_adc_rate(int rate) +{ + return AXP20X_ADC_RATE_HZ(rate); +} + +static int axp22x_adc_rate(int rate) +{ + return AXP22X_ADC_RATE_HZ(rate); +} + +struct axp_data { + const struct iio_info *iio_info; + int num_channels; + struct iio_chan_spec const *channels; + unsigned long adc_en1_mask; + int (*adc_rate)(int rate); + bool adc_en2; + struct iio_map *maps; +}; + +static const struct axp_data axp20x_data = { + .iio_info = &axp20x_adc_iio_info, + .num_channels = ARRAY_SIZE(axp20x_adc_channels), + .channels = axp20x_adc_channels, + .adc_en1_mask = AXP20X_ADC_EN1_MASK, + .adc_rate = axp20x_adc_rate, + .adc_en2 = true, + .maps = axp20x_maps, +}; + +static const struct axp_data axp22x_data = { + .iio_info = &axp22x_adc_iio_info, + .num_channels = ARRAY_SIZE(axp22x_adc_channels), + .channels = axp22x_adc_channels, + .adc_en1_mask = AXP22X_ADC_EN1_MASK, + .adc_rate = axp22x_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, }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(platform, axp20x_adc_id_match); + +static int axp20x_probe(struct platform_device *pdev) +{ + struct axp20x_adc_iio *info; + struct iio_dev *indio_dev; + struct axp20x_dev *axp20x_dev; + int ret; + + axp20x_dev = dev_get_drvdata(pdev->dev.parent); + + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info)); + if (!indio_dev) + return -ENOMEM; + + info = iio_priv(indio_dev); + platform_set_drvdata(pdev, indio_dev); + + info->regmap = axp20x_dev->regmap; + indio_dev->dev.parent = &pdev->dev; + indio_dev->dev.of_node = pdev->dev.of_node; + indio_dev->modes = INDIO_DIRECT_MODE; + + info->data = (struct axp_data *)platform_get_device_id(pdev)->driver_data; + + indio_dev->name = platform_get_device_id(pdev)->name; + indio_dev->info = info->data->iio_info; + indio_dev->num_channels = info->data->num_channels; + indio_dev->channels = info->data->channels; + + /* Enable the ADCs on IP */ + regmap_write(info->regmap, AXP20X_ADC_EN1, info->data->adc_en1_mask); + + if (info->data->adc_en2) + /* Enable GPIO0/1 and internal temperature ADCs */ + regmap_update_bits(info->regmap, AXP20X_ADC_EN2, + AXP20X_ADC_EN2_MASK, AXP20X_ADC_EN2_MASK); + + /* Configure ADCs rate */ + regmap_update_bits(info->regmap, AXP20X_ADC_RATE, AXP20X_ADC_RATE_MASK, + info->data->adc_rate(100)); + + ret = iio_map_array_register(indio_dev, info->data->maps); + if (ret < 0) { + dev_err(&pdev->dev, "failed to register IIO maps: %d\n", ret); + goto fail_map; + } + + ret = iio_device_register(indio_dev); + if (ret < 0) { + dev_err(&pdev->dev, "could not register the device\n"); + goto fail_register; + } + + return 0; + +fail_register: + iio_map_array_unregister(indio_dev); + +fail_map: + regmap_write(info->regmap, AXP20X_ADC_EN1, 0); + + if (info->data->adc_en2) + regmap_write(info->regmap, AXP20X_ADC_EN2, 0); + + return ret; +} + +static int axp20x_remove(struct platform_device *pdev) +{ + struct iio_dev *indio_dev = platform_get_drvdata(pdev); + struct axp20x_adc_iio *info = iio_priv(indio_dev); + + iio_device_unregister(indio_dev); + iio_map_array_unregister(indio_dev); + + regmap_write(info->regmap, AXP20X_ADC_EN1, 0); + + if (info->data->adc_en2) + regmap_write(info->regmap, AXP20X_ADC_EN2, 0); + + return 0; +} + +static struct platform_driver axp20x_adc_driver = { + .driver = { + .name = "axp20x-adc", + }, + .id_table = axp20x_adc_id_match, + .probe = axp20x_probe, + .remove = axp20x_remove, +}; + +module_platform_driver(axp20x_adc_driver); + +MODULE_DESCRIPTION("ADC driver for AXP20X and AXP22X PMICs"); +MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>"); +MODULE_LICENSE("GPL"); |