Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 1 | /* |
| 2 | * axp288_adc.c - X-Powers AXP288 PMIC ADC Driver |
| 3 | * |
| 4 | * Copyright (C) 2014 Intel Corporation |
| 5 | * |
| 6 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; version 2 of the License. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, but |
| 13 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * General Public License for more details. |
| 16 | * |
| 17 | */ |
| 18 | |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/device.h> |
| 22 | #include <linux/regmap.h> |
| 23 | #include <linux/mfd/axp20x.h> |
| 24 | #include <linux/platform_device.h> |
| 25 | |
| 26 | #include <linux/iio/iio.h> |
| 27 | #include <linux/iio/machine.h> |
| 28 | #include <linux/iio/driver.h> |
| 29 | |
| 30 | #define AXP288_ADC_EN_MASK 0xF1 |
Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 31 | |
| 32 | enum axp288_adc_id { |
| 33 | AXP288_ADC_TS, |
| 34 | AXP288_ADC_PMIC, |
| 35 | AXP288_ADC_GP, |
| 36 | AXP288_ADC_BATT_CHRG_I, |
| 37 | AXP288_ADC_BATT_DISCHRG_I, |
| 38 | AXP288_ADC_BATT_V, |
| 39 | AXP288_ADC_NR_CHAN, |
| 40 | }; |
| 41 | |
| 42 | struct axp288_adc_info { |
| 43 | int irq; |
| 44 | struct regmap *regmap; |
| 45 | }; |
| 46 | |
Colin Ian King | 7ca6574 | 2016-01-22 17:49:22 +0000 | [diff] [blame] | 47 | static const struct iio_chan_spec axp288_adc_channels[] = { |
Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 48 | { |
| 49 | .indexed = 1, |
| 50 | .type = IIO_TEMP, |
| 51 | .channel = 0, |
| 52 | .address = AXP288_TS_ADC_H, |
| 53 | .datasheet_name = "TS_PIN", |
Jacob Pan | d0716b0 | 2015-04-06 11:38:20 -0700 | [diff] [blame] | 54 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 55 | }, { |
| 56 | .indexed = 1, |
| 57 | .type = IIO_TEMP, |
| 58 | .channel = 1, |
| 59 | .address = AXP288_PMIC_ADC_H, |
| 60 | .datasheet_name = "PMIC_TEMP", |
Jacob Pan | d0716b0 | 2015-04-06 11:38:20 -0700 | [diff] [blame] | 61 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 62 | }, { |
| 63 | .indexed = 1, |
| 64 | .type = IIO_TEMP, |
| 65 | .channel = 2, |
| 66 | .address = AXP288_GP_ADC_H, |
| 67 | .datasheet_name = "GPADC", |
Jacob Pan | d0716b0 | 2015-04-06 11:38:20 -0700 | [diff] [blame] | 68 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 69 | }, { |
| 70 | .indexed = 1, |
| 71 | .type = IIO_CURRENT, |
| 72 | .channel = 3, |
| 73 | .address = AXP20X_BATT_CHRG_I_H, |
| 74 | .datasheet_name = "BATT_CHG_I", |
Jacob Pan | d0716b0 | 2015-04-06 11:38:20 -0700 | [diff] [blame] | 75 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 76 | }, { |
| 77 | .indexed = 1, |
| 78 | .type = IIO_CURRENT, |
| 79 | .channel = 4, |
| 80 | .address = AXP20X_BATT_DISCHRG_I_H, |
| 81 | .datasheet_name = "BATT_DISCHRG_I", |
Jacob Pan | d0716b0 | 2015-04-06 11:38:20 -0700 | [diff] [blame] | 82 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 83 | }, { |
| 84 | .indexed = 1, |
| 85 | .type = IIO_VOLTAGE, |
| 86 | .channel = 5, |
| 87 | .address = AXP20X_BATT_V_H, |
| 88 | .datasheet_name = "BATT_V", |
Jacob Pan | d0716b0 | 2015-04-06 11:38:20 -0700 | [diff] [blame] | 89 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 90 | }, |
| 91 | }; |
| 92 | |
| 93 | #define AXP288_ADC_MAP(_adc_channel_label, _consumer_dev_name, \ |
| 94 | _consumer_channel) \ |
| 95 | { \ |
| 96 | .adc_channel_label = _adc_channel_label, \ |
| 97 | .consumer_dev_name = _consumer_dev_name, \ |
| 98 | .consumer_channel = _consumer_channel, \ |
| 99 | } |
| 100 | |
| 101 | /* for consumer drivers */ |
| 102 | static struct iio_map axp288_adc_default_maps[] = { |
| 103 | AXP288_ADC_MAP("TS_PIN", "axp288-batt", "axp288-batt-temp"), |
| 104 | AXP288_ADC_MAP("PMIC_TEMP", "axp288-pmic", "axp288-pmic-temp"), |
| 105 | AXP288_ADC_MAP("GPADC", "axp288-gpadc", "axp288-system-temp"), |
| 106 | AXP288_ADC_MAP("BATT_CHG_I", "axp288-chrg", "axp288-chrg-curr"), |
| 107 | AXP288_ADC_MAP("BATT_DISCHRG_I", "axp288-chrg", "axp288-chrg-d-curr"), |
| 108 | AXP288_ADC_MAP("BATT_V", "axp288-batt", "axp288-batt-volt"), |
| 109 | {}, |
| 110 | }; |
| 111 | |
| 112 | static int axp288_adc_read_channel(int *val, unsigned long address, |
| 113 | struct regmap *regmap) |
| 114 | { |
| 115 | u8 buf[2]; |
| 116 | |
| 117 | if (regmap_bulk_read(regmap, address, buf, 2)) |
| 118 | return -EIO; |
| 119 | *val = (buf[0] << 4) + ((buf[1] >> 4) & 0x0F); |
| 120 | |
| 121 | return IIO_VAL_INT; |
| 122 | } |
| 123 | |
Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 124 | static int axp288_adc_read_raw(struct iio_dev *indio_dev, |
| 125 | struct iio_chan_spec const *chan, |
| 126 | int *val, int *val2, long mask) |
| 127 | { |
| 128 | int ret; |
| 129 | struct axp288_adc_info *info = iio_priv(indio_dev); |
| 130 | |
| 131 | mutex_lock(&indio_dev->mlock); |
| 132 | switch (mask) { |
| 133 | case IIO_CHAN_INFO_RAW: |
Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 134 | ret = axp288_adc_read_channel(val, chan->address, info->regmap); |
Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 135 | break; |
Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 136 | default: |
| 137 | ret = -EINVAL; |
| 138 | } |
| 139 | mutex_unlock(&indio_dev->mlock); |
| 140 | |
| 141 | return ret; |
| 142 | } |
| 143 | |
Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 144 | static const struct iio_info axp288_adc_iio_info = { |
| 145 | .read_raw = &axp288_adc_read_raw, |
| 146 | .driver_module = THIS_MODULE, |
| 147 | }; |
| 148 | |
| 149 | static int axp288_adc_probe(struct platform_device *pdev) |
| 150 | { |
| 151 | int ret; |
| 152 | struct axp288_adc_info *info; |
| 153 | struct iio_dev *indio_dev; |
| 154 | struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent); |
| 155 | |
| 156 | indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info)); |
| 157 | if (!indio_dev) |
| 158 | return -ENOMEM; |
| 159 | |
| 160 | info = iio_priv(indio_dev); |
| 161 | info->irq = platform_get_irq(pdev, 0); |
| 162 | if (info->irq < 0) { |
| 163 | dev_err(&pdev->dev, "no irq resource?\n"); |
| 164 | return info->irq; |
| 165 | } |
| 166 | platform_set_drvdata(pdev, indio_dev); |
| 167 | info->regmap = axp20x->regmap; |
| 168 | /* |
| 169 | * Set ADC to enabled state at all time, including system suspend. |
| 170 | * otherwise internal fuel gauge functionality may be affected. |
| 171 | */ |
Hans de Goede | ff9b560 | 2016-12-14 14:55:25 +0100 | [diff] [blame] | 172 | ret = regmap_write(info->regmap, AXP20X_ADC_EN1, AXP288_ADC_EN_MASK); |
Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 173 | if (ret) { |
| 174 | dev_err(&pdev->dev, "unable to enable ADC device\n"); |
| 175 | return ret; |
| 176 | } |
| 177 | |
| 178 | indio_dev->dev.parent = &pdev->dev; |
| 179 | indio_dev->name = pdev->name; |
| 180 | indio_dev->channels = axp288_adc_channels; |
| 181 | indio_dev->num_channels = ARRAY_SIZE(axp288_adc_channels); |
| 182 | indio_dev->info = &axp288_adc_iio_info; |
| 183 | indio_dev->modes = INDIO_DIRECT_MODE; |
| 184 | ret = iio_map_array_register(indio_dev, axp288_adc_default_maps); |
| 185 | if (ret < 0) |
| 186 | return ret; |
| 187 | |
| 188 | ret = iio_device_register(indio_dev); |
| 189 | if (ret < 0) { |
| 190 | dev_err(&pdev->dev, "unable to register iio device\n"); |
| 191 | goto err_array_unregister; |
| 192 | } |
| 193 | return 0; |
| 194 | |
| 195 | err_array_unregister: |
| 196 | iio_map_array_unregister(indio_dev); |
| 197 | |
| 198 | return ret; |
| 199 | } |
| 200 | |
| 201 | static int axp288_adc_remove(struct platform_device *pdev) |
| 202 | { |
| 203 | struct iio_dev *indio_dev = platform_get_drvdata(pdev); |
| 204 | |
| 205 | iio_device_unregister(indio_dev); |
| 206 | iio_map_array_unregister(indio_dev); |
| 207 | |
| 208 | return 0; |
| 209 | } |
| 210 | |
Krzysztof Kozlowski | e682173 | 2015-05-02 00:53:31 +0900 | [diff] [blame] | 211 | static const struct platform_device_id axp288_adc_id_table[] = { |
Aaron Lu | 29ec0a2 | 2014-11-11 11:30:08 -0800 | [diff] [blame] | 212 | { .name = "axp288_adc" }, |
| 213 | {}, |
| 214 | }; |
| 215 | |
Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 216 | static struct platform_driver axp288_adc_driver = { |
| 217 | .probe = axp288_adc_probe, |
| 218 | .remove = axp288_adc_remove, |
Aaron Lu | 29ec0a2 | 2014-11-11 11:30:08 -0800 | [diff] [blame] | 219 | .id_table = axp288_adc_id_table, |
Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 220 | .driver = { |
| 221 | .name = "axp288_adc", |
Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 222 | }, |
| 223 | }; |
| 224 | |
Aaron Lu | 29ec0a2 | 2014-11-11 11:30:08 -0800 | [diff] [blame] | 225 | MODULE_DEVICE_TABLE(platform, axp288_adc_id_table); |
| 226 | |
Jacob Pan | de89bd7 | 2014-10-06 21:17:15 -0700 | [diff] [blame] | 227 | module_platform_driver(axp288_adc_driver); |
| 228 | |
| 229 | MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@linux.intel.com>"); |
| 230 | MODULE_DESCRIPTION("X-Powers AXP288 ADC Driver"); |
| 231 | MODULE_LICENSE("GPL"); |