1 /* ADC driver for AXP20X and AXP22X PMICs
3 * Copyright (c) 2016 Free Electrons NextThing Co.
4 * Quentin Schulz <quentin.schulz@free-electrons.com>
6 * This program is free software; you can redistribute it and/or modify it under
7 * the terms of the GNU General Public License version 2 as published by the
8 * Free Software Foundation.
11 #include <linux/completion.h>
12 #include <linux/interrupt.h>
14 #include <linux/module.h>
16 #include <linux/of_device.h>
17 #include <linux/platform_device.h>
18 #include <linux/pm_runtime.h>
19 #include <linux/regmap.h>
20 #include <linux/thermal.h>
22 #include <linux/iio/iio.h>
23 #include <linux/iio/driver.h>
24 #include <linux/iio/machine.h>
25 #include <linux/mfd/axp20x.h>
27 #define AXP20X_ADC_EN1_MASK GENMASK(7, 0)
29 #define AXP20X_ADC_EN2_MASK (GENMASK(3, 2) | BIT(7))
30 #define AXP22X_ADC_EN1_MASK (GENMASK(7, 5) | BIT(0))
32 #define AXP20X_GPIO10_IN_RANGE_GPIO0 BIT(0)
33 #define AXP20X_GPIO10_IN_RANGE_GPIO1 BIT(1)
34 #define AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(x) ((x) & BIT(0))
35 #define AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(x) (((x) & BIT(0)) << 1)
37 #define AXP20X_ADC_RATE_MASK GENMASK(7, 6)
38 #define AXP20X_ADC_RATE_HZ(x) ((ilog2((x) / 25) << 6) & AXP20X_ADC_RATE_MASK)
39 #define AXP22X_ADC_RATE_HZ(x) ((ilog2((x) / 100) << 6) & AXP20X_ADC_RATE_MASK)
41 #define AXP20X_ADC_CHANNEL(_channel, _name, _type, _reg) \
45 .channel = _channel, \
47 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
48 BIT(IIO_CHAN_INFO_SCALE), \
49 .datasheet_name = _name, \
52 #define AXP20X_ADC_CHANNEL_OFFSET(_channel, _name, _type, _reg) \
56 .channel = _channel, \
58 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
59 BIT(IIO_CHAN_INFO_SCALE) |\
60 BIT(IIO_CHAN_INFO_OFFSET),\
61 .datasheet_name = _name, \
66 struct axp20x_adc_iio {
67 struct regmap *regmap;
68 struct axp_data *data;
71 enum axp20x_adc_channel_v {
81 enum axp20x_adc_channel_i {
85 AXP20X_BATT_DISCHRG_I,
88 enum axp22x_adc_channel_v {
93 enum axp22x_adc_channel_i {
94 AXP22X_BATT_CHRG_I = 1,
95 AXP22X_BATT_DISCHRG_I,
98 static struct iio_map axp20x_maps[] = {
100 .consumer_dev_name = "axp20x-usb-power-supply",
101 .consumer_channel = "vbus_v",
102 .adc_channel_label = "vbus_v",
104 .consumer_dev_name = "axp20x-usb-power-supply",
105 .consumer_channel = "vbus_i",
106 .adc_channel_label = "vbus_i",
108 .consumer_dev_name = "axp20x-ac-power-supply",
109 .consumer_channel = "acin_v",
110 .adc_channel_label = "acin_v",
112 .consumer_dev_name = "axp20x-ac-power-supply",
113 .consumer_channel = "acin_i",
114 .adc_channel_label = "acin_i",
116 .consumer_dev_name = "axp20x-battery-power-supply",
117 .consumer_channel = "batt_v",
118 .adc_channel_label = "batt_v",
120 .consumer_dev_name = "axp20x-battery-power-supply",
121 .consumer_channel = "batt_chrg_i",
122 .adc_channel_label = "batt_chrg_i",
124 .consumer_dev_name = "axp20x-battery-power-supply",
125 .consumer_channel = "batt_dischrg_i",
126 .adc_channel_label = "batt_dischrg_i",
127 }, { /* sentinel */ }
130 static struct iio_map axp22x_maps[] = {
132 .consumer_dev_name = "axp20x-battery-power-supply",
133 .consumer_channel = "batt_v",
134 .adc_channel_label = "batt_v",
136 .consumer_dev_name = "axp20x-battery-power-supply",
137 .consumer_channel = "batt_chrg_i",
138 .adc_channel_label = "batt_chrg_i",
140 .consumer_dev_name = "axp20x-battery-power-supply",
141 .consumer_channel = "batt_dischrg_i",
142 .adc_channel_label = "batt_dischrg_i",
143 }, { /* sentinel */ }
147 * Channels are mapped by physical system. Their channels share the same index.
148 * i.e. acin_i is in_current0_raw and acin_v is in_voltage0_raw.
149 * The only exception is for the battery. batt_v will be in_voltage6_raw and
150 * charge current in_current6_raw and discharge current will be in_current7_raw.
152 static const struct iio_chan_spec axp20x_adc_channels[] = {
153 AXP20X_ADC_CHANNEL(AXP20X_ACIN_V, "acin_v", IIO_VOLTAGE,
154 AXP20X_ACIN_V_ADC_H),
155 AXP20X_ADC_CHANNEL(AXP20X_ACIN_I, "acin_i", IIO_CURRENT,
156 AXP20X_ACIN_I_ADC_H),
157 AXP20X_ADC_CHANNEL(AXP20X_VBUS_V, "vbus_v", IIO_VOLTAGE,
158 AXP20X_VBUS_V_ADC_H),
159 AXP20X_ADC_CHANNEL(AXP20X_VBUS_I, "vbus_i", IIO_CURRENT,
160 AXP20X_VBUS_I_ADC_H),
163 .address = AXP20X_TEMP_ADC_H,
164 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
165 BIT(IIO_CHAN_INFO_SCALE) |
166 BIT(IIO_CHAN_INFO_OFFSET),
167 .datasheet_name = "pmic_temp",
169 AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO0_V, "gpio0_v", IIO_VOLTAGE,
170 AXP20X_GPIO0_V_ADC_H),
171 AXP20X_ADC_CHANNEL_OFFSET(AXP20X_GPIO1_V, "gpio1_v", IIO_VOLTAGE,
172 AXP20X_GPIO1_V_ADC_H),
173 AXP20X_ADC_CHANNEL(AXP20X_IPSOUT_V, "ipsout_v", IIO_VOLTAGE,
174 AXP20X_IPSOUT_V_HIGH_H),
175 AXP20X_ADC_CHANNEL(AXP20X_BATT_V, "batt_v", IIO_VOLTAGE,
177 AXP20X_ADC_CHANNEL(AXP20X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT,
178 AXP20X_BATT_CHRG_I_H),
179 AXP20X_ADC_CHANNEL(AXP20X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT,
180 AXP20X_BATT_DISCHRG_I_H),
183 static const struct iio_chan_spec axp22x_adc_channels[] = {
186 .address = AXP22X_PMIC_TEMP_H,
187 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
188 BIT(IIO_CHAN_INFO_SCALE) |
189 BIT(IIO_CHAN_INFO_OFFSET),
190 .datasheet_name = "pmic_temp",
192 AXP20X_ADC_CHANNEL(AXP22X_BATT_V, "batt_v", IIO_VOLTAGE,
194 AXP20X_ADC_CHANNEL(AXP22X_BATT_CHRG_I, "batt_chrg_i", IIO_CURRENT,
195 AXP20X_BATT_CHRG_I_H),
196 AXP20X_ADC_CHANNEL(AXP22X_BATT_DISCHRG_I, "batt_dischrg_i", IIO_CURRENT,
197 AXP20X_BATT_DISCHRG_I_H),
200 static int axp20x_adc_raw(struct iio_dev *indio_dev,
201 struct iio_chan_spec const *chan, int *val)
203 struct axp20x_adc_iio *info = iio_priv(indio_dev);
207 * N.B.: Unlike the Chinese datasheets tell, the charging current is
208 * stored on 12 bits, not 13 bits. Only discharging current is on 13
211 if (chan->type == IIO_CURRENT && chan->channel == AXP20X_BATT_DISCHRG_I)
216 *val = axp20x_read_variable_width(info->regmap, chan->address, size);
223 static int axp22x_adc_raw(struct iio_dev *indio_dev,
224 struct iio_chan_spec const *chan, int *val)
226 struct axp20x_adc_iio *info = iio_priv(indio_dev);
230 * N.B.: Unlike the Chinese datasheets tell, the charging current is
231 * stored on 12 bits, not 13 bits. Only discharging current is on 13
234 if (chan->type == IIO_CURRENT && chan->channel == AXP22X_BATT_DISCHRG_I)
239 *val = axp20x_read_variable_width(info->regmap, chan->address, size);
246 static int axp20x_adc_scale_voltage(int channel, int *val, int *val2)
253 return IIO_VAL_INT_PLUS_MICRO;
259 return IIO_VAL_INT_PLUS_MICRO;
264 return IIO_VAL_INT_PLUS_MICRO;
266 case AXP20X_IPSOUT_V:
269 return IIO_VAL_INT_PLUS_MICRO;
276 static int axp20x_adc_scale_current(int channel, int *val, int *val2)
282 return IIO_VAL_INT_PLUS_MICRO;
287 return IIO_VAL_INT_PLUS_MICRO;
289 case AXP20X_BATT_DISCHRG_I:
290 case AXP20X_BATT_CHRG_I:
293 return IIO_VAL_INT_PLUS_MICRO;
300 static int axp20x_adc_scale(struct iio_chan_spec const *chan, int *val,
303 switch (chan->type) {
305 return axp20x_adc_scale_voltage(chan->channel, val, val2);
308 return axp20x_adc_scale_current(chan->channel, val, val2);
319 static int axp22x_adc_scale(struct iio_chan_spec const *chan, int *val,
322 switch (chan->type) {
324 if (chan->channel != AXP22X_BATT_V)
329 return IIO_VAL_INT_PLUS_MICRO;
334 return IIO_VAL_INT_PLUS_MICRO;
345 static int axp20x_adc_offset_voltage(struct iio_dev *indio_dev, int channel,
348 struct axp20x_adc_iio *info = iio_priv(indio_dev);
351 ret = regmap_read(info->regmap, AXP20X_GPIO10_IN_RANGE, val);
357 *val &= AXP20X_GPIO10_IN_RANGE_GPIO0;
361 *val &= AXP20X_GPIO10_IN_RANGE_GPIO1;
368 *val = !!(*val) * 700000;
373 static int axp20x_adc_offset(struct iio_dev *indio_dev,
374 struct iio_chan_spec const *chan, int *val)
376 switch (chan->type) {
378 return axp20x_adc_offset_voltage(indio_dev, chan->channel, val);
389 static int axp20x_read_raw(struct iio_dev *indio_dev,
390 struct iio_chan_spec const *chan, int *val,
391 int *val2, long mask)
394 case IIO_CHAN_INFO_OFFSET:
395 return axp20x_adc_offset(indio_dev, chan, val);
397 case IIO_CHAN_INFO_SCALE:
398 return axp20x_adc_scale(chan, val, val2);
400 case IIO_CHAN_INFO_RAW:
401 return axp20x_adc_raw(indio_dev, chan, val);
408 static int axp22x_read_raw(struct iio_dev *indio_dev,
409 struct iio_chan_spec const *chan, int *val,
410 int *val2, long mask)
413 case IIO_CHAN_INFO_OFFSET:
417 case IIO_CHAN_INFO_SCALE:
418 return axp22x_adc_scale(chan, val, val2);
420 case IIO_CHAN_INFO_RAW:
421 return axp22x_adc_raw(indio_dev, chan, val);
428 static int axp20x_write_raw(struct iio_dev *indio_dev,
429 struct iio_chan_spec const *chan, int val, int val2,
432 struct axp20x_adc_iio *info = iio_priv(indio_dev);
433 unsigned int reg, regval;
436 * The AXP20X PMIC allows the user to choose between 0V and 0.7V offsets
437 * for (independently) GPIO0 and GPIO1 when in ADC mode.
439 if (mask != IIO_CHAN_INFO_OFFSET)
442 if (val != 0 && val != 700000)
445 switch (chan->channel) {
447 reg = AXP20X_GPIO10_IN_RANGE_GPIO0;
448 regval = AXP20X_GPIO10_IN_RANGE_GPIO0_VAL(!!val);
452 reg = AXP20X_GPIO10_IN_RANGE_GPIO1;
453 regval = AXP20X_GPIO10_IN_RANGE_GPIO1_VAL(!!val);
460 return regmap_update_bits(info->regmap, AXP20X_GPIO10_IN_RANGE, reg,
464 static const struct iio_info axp20x_adc_iio_info = {
465 .read_raw = axp20x_read_raw,
466 .write_raw = axp20x_write_raw,
467 .driver_module = THIS_MODULE,
470 static const struct iio_info axp22x_adc_iio_info = {
471 .read_raw = axp22x_read_raw,
472 .driver_module = THIS_MODULE,
475 static int axp20x_adc_rate(int rate)
477 return AXP20X_ADC_RATE_HZ(rate);
480 static int axp22x_adc_rate(int rate)
482 return AXP22X_ADC_RATE_HZ(rate);
486 const struct iio_info *iio_info;
488 struct iio_chan_spec const *channels;
489 unsigned long adc_en1_mask;
490 int (*adc_rate)(int rate);
492 struct iio_map *maps;
495 static const struct axp_data axp20x_data = {
496 .iio_info = &axp20x_adc_iio_info,
497 .num_channels = ARRAY_SIZE(axp20x_adc_channels),
498 .channels = axp20x_adc_channels,
499 .adc_en1_mask = AXP20X_ADC_EN1_MASK,
500 .adc_rate = axp20x_adc_rate,
505 static const struct axp_data axp22x_data = {
506 .iio_info = &axp22x_adc_iio_info,
507 .num_channels = ARRAY_SIZE(axp22x_adc_channels),
508 .channels = axp22x_adc_channels,
509 .adc_en1_mask = AXP22X_ADC_EN1_MASK,
510 .adc_rate = axp22x_adc_rate,
515 static const struct platform_device_id axp20x_adc_id_match[] = {
516 { .name = "axp20x-adc", .driver_data = (kernel_ulong_t)&axp20x_data, },
517 { .name = "axp22x-adc", .driver_data = (kernel_ulong_t)&axp22x_data, },
520 MODULE_DEVICE_TABLE(platform, axp20x_adc_id_match);
522 static int axp20x_probe(struct platform_device *pdev)
524 struct axp20x_adc_iio *info;
525 struct iio_dev *indio_dev;
526 struct axp20x_dev *axp20x_dev;
529 axp20x_dev = dev_get_drvdata(pdev->dev.parent);
531 indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info));
535 info = iio_priv(indio_dev);
536 platform_set_drvdata(pdev, indio_dev);
538 info->regmap = axp20x_dev->regmap;
539 indio_dev->dev.parent = &pdev->dev;
540 indio_dev->dev.of_node = pdev->dev.of_node;
541 indio_dev->modes = INDIO_DIRECT_MODE;
543 info->data = (struct axp_data *)platform_get_device_id(pdev)->driver_data;
545 indio_dev->name = platform_get_device_id(pdev)->name;
546 indio_dev->info = info->data->iio_info;
547 indio_dev->num_channels = info->data->num_channels;
548 indio_dev->channels = info->data->channels;
550 /* Enable the ADCs on IP */
551 regmap_write(info->regmap, AXP20X_ADC_EN1, info->data->adc_en1_mask);
553 if (info->data->adc_en2)
554 /* Enable GPIO0/1 and internal temperature ADCs */
555 regmap_update_bits(info->regmap, AXP20X_ADC_EN2,
556 AXP20X_ADC_EN2_MASK, AXP20X_ADC_EN2_MASK);
558 /* Configure ADCs rate */
559 regmap_update_bits(info->regmap, AXP20X_ADC_RATE, AXP20X_ADC_RATE_MASK,
560 info->data->adc_rate(100));
562 ret = iio_map_array_register(indio_dev, info->data->maps);
564 dev_err(&pdev->dev, "failed to register IIO maps: %d\n", ret);
568 ret = iio_device_register(indio_dev);
570 dev_err(&pdev->dev, "could not register the device\n");
577 iio_map_array_unregister(indio_dev);
580 regmap_write(info->regmap, AXP20X_ADC_EN1, 0);
582 if (info->data->adc_en2)
583 regmap_write(info->regmap, AXP20X_ADC_EN2, 0);
588 static int axp20x_remove(struct platform_device *pdev)
590 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
591 struct axp20x_adc_iio *info = iio_priv(indio_dev);
593 iio_device_unregister(indio_dev);
594 iio_map_array_unregister(indio_dev);
596 regmap_write(info->regmap, AXP20X_ADC_EN1, 0);
598 if (info->data->adc_en2)
599 regmap_write(info->regmap, AXP20X_ADC_EN2, 0);
604 static struct platform_driver axp20x_adc_driver = {
606 .name = "axp20x-adc",
608 .id_table = axp20x_adc_id_match,
609 .probe = axp20x_probe,
610 .remove = axp20x_remove,
613 module_platform_driver(axp20x_adc_driver);
615 MODULE_DESCRIPTION("ADC driver for AXP20X and AXP22X PMICs");
616 MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
617 MODULE_LICENSE("GPL");