drivers/acpi/pmic/intel_pmic_xpower.c

   1 /*
   2  * intel_pmic_xpower.c - XPower AXP288 PMIC operation region driver
   3  *
   4  * Copyright (C) 2014 Intel Corporation. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License version
   8  * 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/init.h>
  17 #include <linux/acpi.h>
  18 #include <linux/mfd/axp20x.h>
  19 #include <linux/regmap.h>
  20 #include <linux/platform_device.h>
  21 #include "intel_pmic.h"
  22
  23 #define XPOWER_GPADC_LOW        0x5b
  24 #define XPOWER_GPI1_CTRL        0x92
  25
  26 #define GPI1_LDO_MASK           GENMASK(2, 0)
  27 #define GPI1_LDO_ON             (3 << 0)
  28 #define GPI1_LDO_OFF            (4 << 0)
  29
  30 #define AXP288_ADC_TS_PIN_GPADC 0xf2
  31 #define AXP288_ADC_TS_PIN_ON    0xf3
  32
  33 static struct pmic_table power_table[] = {
  34         {
  35                 .address = 0x00,
  36                 .reg = 0x13,
  37                 .bit = 0x05,
  38         }, /* ALD1 */
  39         {
  40                 .address = 0x04,
  41                 .reg = 0x13,
  42                 .bit = 0x06,
  43         }, /* ALD2 */
  44         {
  45                 .address = 0x08,
  46                 .reg = 0x13,
  47                 .bit = 0x07,
  48         }, /* ALD3 */
  49         {
  50                 .address = 0x0c,
  51                 .reg = 0x12,
  52                 .bit = 0x03,
  53         }, /* DLD1 */
  54         {
  55                 .address = 0x10,
  56                 .reg = 0x12,
  57                 .bit = 0x04,
  58         }, /* DLD2 */
  59         {
  60                 .address = 0x14,
  61                 .reg = 0x12,
  62                 .bit = 0x05,
  63         }, /* DLD3 */
  64         {
  65                 .address = 0x18,
  66                 .reg = 0x12,
  67                 .bit = 0x06,
  68         }, /* DLD4 */
  69         {
  70                 .address = 0x1c,
  71                 .reg = 0x12,
  72                 .bit = 0x00,
  73         }, /* ELD1 */
  74         {
  75                 .address = 0x20,
  76                 .reg = 0x12,
  77                 .bit = 0x01,
  78         }, /* ELD2 */
  79         {
  80                 .address = 0x24,
  81                 .reg = 0x12,
  82                 .bit = 0x02,
  83         }, /* ELD3 */
  84         {
  85                 .address = 0x28,
  86                 .reg = 0x13,
  87                 .bit = 0x02,
  88         }, /* FLD1 */
  89         {
  90                 .address = 0x2c,
  91                 .reg = 0x13,
  92                 .bit = 0x03,
  93         }, /* FLD2 */
  94         {
  95                 .address = 0x30,
  96                 .reg = 0x13,
  97                 .bit = 0x04,
  98         }, /* FLD3 */
  99         {
 100                 .address = 0x34,
 101                 .reg = 0x10,
 102                 .bit = 0x03,
 103         }, /* BUC1 */
 104         {
 105                 .address = 0x38,
 106                 .reg = 0x10,
 107                 .bit = 0x06,
 108         }, /* BUC2 */
 109         {
 110                 .address = 0x3c,
 111                 .reg = 0x10,
 112                 .bit = 0x05,
 113         }, /* BUC3 */
 114         {
 115                 .address = 0x40,
 116                 .reg = 0x10,
 117                 .bit = 0x04,
 118         }, /* BUC4 */
 119         {
 120                 .address = 0x44,
 121                 .reg = 0x10,
 122                 .bit = 0x01,
 123         }, /* BUC5 */
 124         {
 125                 .address = 0x48,
 126                 .reg = 0x10,
 127                 .bit = 0x00
 128         }, /* BUC6 */
 129         {
 130                 .address = 0x4c,
 131                 .reg = 0x92,
 132         }, /* GPI1 */
 133 };
 134
 135 /* TMP0 - TMP5 are the same, all from GPADC */
 136 static struct pmic_table thermal_table[] = {
 137         {
 138                 .address = 0x00,
 139                 .reg = XPOWER_GPADC_LOW
 140         },
 141         {
 142                 .address = 0x0c,
 143                 .reg = XPOWER_GPADC_LOW
 144         },
 145         {
 146                 .address = 0x18,
 147                 .reg = XPOWER_GPADC_LOW
 148         },
 149         {
 150                 .address = 0x24,
 151                 .reg = XPOWER_GPADC_LOW
 152         },
 153         {
 154                 .address = 0x30,
 155                 .reg = XPOWER_GPADC_LOW
 156         },
 157         {
 158                 .address = 0x3c,
 159                 .reg = XPOWER_GPADC_LOW
 160         },
 161 };
 162
 163 static int intel_xpower_pmic_get_power(struct regmap *regmap, int reg,
 164                                        int bit, u64 *value)
 165 {
 166         int data;
 167
 168         if (regmap_read(regmap, reg, &data))
 169                 return -EIO;
 170
 171         /* GPIO1 LDO regulator needs special handling */
 172         if (reg == XPOWER_GPI1_CTRL)
 173                 *value = ((data & GPI1_LDO_MASK) == GPI1_LDO_ON);
 174         else
 175                 *value = (data & BIT(bit)) ? 1 : 0;
 176
 177         return 0;
 178 }
 179
 180 static int intel_xpower_pmic_update_power(struct regmap *regmap, int reg,
 181                                           int bit, bool on)
 182 {
 183         int data;
 184
 185         /* GPIO1 LDO regulator needs special handling */
 186         if (reg == XPOWER_GPI1_CTRL)
 187                 return regmap_update_bits(regmap, reg, GPI1_LDO_MASK,
 188                                           on ? GPI1_LDO_ON : GPI1_LDO_OFF);
 189
 190         if (regmap_read(regmap, reg, &data))
 191                 return -EIO;
 192
 193         if (on)
 194                 data |= BIT(bit);
 195         else
 196                 data &= ~BIT(bit);
 197
 198         if (regmap_write(regmap, reg, data))
 199                 return -EIO;
 200
 201         return 0;
 202 }
 203
 204 /**
 205  * intel_xpower_pmic_get_raw_temp(): Get raw temperature reading from the PMIC
 206  *
 207  * @regmap: regmap of the PMIC device
 208  * @reg: register to get the reading
 209  *
 210  * Return a positive value on success, errno on failure.
 211  */
 212 static int intel_xpower_pmic_get_raw_temp(struct regmap *regmap, int reg)
 213 {
 214         u8 buf[2];
 215         int ret;
 216
 217         ret = regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL,
 218                            AXP288_ADC_TS_PIN_GPADC);
 219         if (ret)
 220                 return ret;
 221
 222         /* After switching to the GPADC pin give things some time to settle */
 223         usleep_range(6000, 10000);
 224
 225         ret = regmap_bulk_read(regmap, AXP288_GP_ADC_H, buf, 2);
 226         if (ret == 0)
 227                 ret = (buf[0] << 4) + ((buf[1] >> 4) & 0x0f);
 228
 229         regmap_write(regmap, AXP288_ADC_TS_PIN_CTRL, AXP288_ADC_TS_PIN_ON);
 230
 231         return ret;
 232 }
 233
 234 static struct intel_pmic_opregion_data intel_xpower_pmic_opregion_data = {
 235         .get_power = intel_xpower_pmic_get_power,
 236         .update_power = intel_xpower_pmic_update_power,
 237         .get_raw_temp = intel_xpower_pmic_get_raw_temp,
 238         .power_table = power_table,
 239         .power_table_count = ARRAY_SIZE(power_table),
 240         .thermal_table = thermal_table,
 241         .thermal_table_count = ARRAY_SIZE(thermal_table),
 242 };
 243
 244 static acpi_status intel_xpower_pmic_gpio_handler(u32 function,
 245                 acpi_physical_address address, u32 bit_width, u64 *value,
 246                 void *handler_context, void *region_context)
 247 {
 248         return AE_OK;
 249 }
 250
 251 static int intel_xpower_pmic_opregion_probe(struct platform_device *pdev)
 252 {
 253         struct device *parent = pdev->dev.parent;
 254         struct axp20x_dev *axp20x = dev_get_drvdata(parent);
 255         acpi_status status;
 256         int result;
 257
 258         status = acpi_install_address_space_handler(ACPI_HANDLE(parent),
 259                         ACPI_ADR_SPACE_GPIO, intel_xpower_pmic_gpio_handler,
 260                         NULL, NULL);
 261         if (ACPI_FAILURE(status))
 262                 return -ENODEV;
 263
 264         result = intel_pmic_install_opregion_handler(&pdev->dev,
 265                                         ACPI_HANDLE(parent), axp20x->regmap,
 266                                         &intel_xpower_pmic_opregion_data);
 267         if (result)
 268                 acpi_remove_address_space_handler(ACPI_HANDLE(parent),
 269                                                   ACPI_ADR_SPACE_GPIO,
 270                                                   intel_xpower_pmic_gpio_handler);
 271
 272         return result;
 273 }
 274
 275 static struct platform_driver intel_xpower_pmic_opregion_driver = {
 276         .probe = intel_xpower_pmic_opregion_probe,
 277         .driver = {
 278                 .name = "axp288_pmic_acpi",
 279         },
 280 };
 281 builtin_platform_driver(intel_xpower_pmic_opregion_driver);