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 static struct pmic_table power_table[] = {
  31         {
  32                 .address = 0x00,
  33                 .reg = 0x13,
  34                 .bit = 0x05,
  35         }, /* ALD1 */
  36         {
  37                 .address = 0x04,
  38                 .reg = 0x13,
  39                 .bit = 0x06,
  40         }, /* ALD2 */
  41         {
  42                 .address = 0x08,
  43                 .reg = 0x13,
  44                 .bit = 0x07,
  45         }, /* ALD3 */
  46         {
  47                 .address = 0x0c,
  48                 .reg = 0x12,
  49                 .bit = 0x03,
  50         }, /* DLD1 */
  51         {
  52                 .address = 0x10,
  53                 .reg = 0x12,
  54                 .bit = 0x04,
  55         }, /* DLD2 */
  56         {
  57                 .address = 0x14,
  58                 .reg = 0x12,
  59                 .bit = 0x05,
  60         }, /* DLD3 */
  61         {
  62                 .address = 0x18,
  63                 .reg = 0x12,
  64                 .bit = 0x06,
  65         }, /* DLD4 */
  66         {
  67                 .address = 0x1c,
  68                 .reg = 0x12,
  69                 .bit = 0x00,
  70         }, /* ELD1 */
  71         {
  72                 .address = 0x20,
  73                 .reg = 0x12,
  74                 .bit = 0x01,
  75         }, /* ELD2 */
  76         {
  77                 .address = 0x24,
  78                 .reg = 0x12,
  79                 .bit = 0x02,
  80         }, /* ELD3 */
  81         {
  82                 .address = 0x28,
  83                 .reg = 0x13,
  84                 .bit = 0x02,
  85         }, /* FLD1 */
  86         {
  87                 .address = 0x2c,
  88                 .reg = 0x13,
  89                 .bit = 0x03,
  90         }, /* FLD2 */
  91         {
  92                 .address = 0x30,
  93                 .reg = 0x13,
  94                 .bit = 0x04,
  95         }, /* FLD3 */
  96         {
  97                 .address = 0x34,
  98                 .reg = 0x10,
  99                 .bit = 0x03,
 100         }, /* BUC1 */
 101         {
 102                 .address = 0x38,
 103                 .reg = 0x10,
 104                 .bit = 0x06,
 105         }, /* BUC2 */
 106         {
 107                 .address = 0x3c,
 108                 .reg = 0x10,
 109                 .bit = 0x05,
 110         }, /* BUC3 */
 111         {
 112                 .address = 0x40,
 113                 .reg = 0x10,
 114                 .bit = 0x04,
 115         }, /* BUC4 */
 116         {
 117                 .address = 0x44,
 118                 .reg = 0x10,
 119                 .bit = 0x01,
 120         }, /* BUC5 */
 121         {
 122                 .address = 0x48,
 123                 .reg = 0x10,
 124                 .bit = 0x00
 125         }, /* BUC6 */
 126         {
 127                 .address = 0x4c,
 128                 .reg = 0x92,
 129         }, /* GPI1 */
 130 };
 131
 132 /* TMP0 - TMP5 are the same, all from GPADC */
 133 static struct pmic_table thermal_table[] = {
 134         {
 135                 .address = 0x00,
 136                 .reg = XPOWER_GPADC_LOW
 137         },
 138         {
 139                 .address = 0x0c,
 140                 .reg = XPOWER_GPADC_LOW
 141         },
 142         {
 143                 .address = 0x18,
 144                 .reg = XPOWER_GPADC_LOW
 145         },
 146         {
 147                 .address = 0x24,
 148                 .reg = XPOWER_GPADC_LOW
 149         },
 150         {
 151                 .address = 0x30,
 152                 .reg = XPOWER_GPADC_LOW
 153         },
 154         {
 155                 .address = 0x3c,
 156                 .reg = XPOWER_GPADC_LOW
 157         },
 158 };
 159
 160 static int intel_xpower_pmic_get_power(struct regmap *regmap, int reg,
 161                                        int bit, u64 *value)
 162 {
 163         int data;
 164
 165         if (regmap_read(regmap, reg, &data))
 166                 return -EIO;
 167
 168         /* GPIO1 LDO regulator needs special handling */
 169         if (reg == XPOWER_GPI1_CTRL)
 170                 *value = ((data & GPI1_LDO_MASK) == GPI1_LDO_ON);
 171         else
 172                 *value = (data & BIT(bit)) ? 1 : 0;
 173
 174         return 0;
 175 }
 176
 177 static int intel_xpower_pmic_update_power(struct regmap *regmap, int reg,
 178                                           int bit, bool on)
 179 {
 180         int data;
 181
 182         /* GPIO1 LDO regulator needs special handling */
 183         if (reg == XPOWER_GPI1_CTRL)
 184                 return regmap_update_bits(regmap, reg, GPI1_LDO_MASK,
 185                                           on ? GPI1_LDO_ON : GPI1_LDO_OFF);
 186
 187         if (regmap_read(regmap, reg, &data))
 188                 return -EIO;
 189
 190         if (on)
 191                 data |= BIT(bit);
 192         else
 193                 data &= ~BIT(bit);
 194
 195         if (regmap_write(regmap, reg, data))
 196                 return -EIO;
 197
 198         return 0;
 199 }
 200
 201 /**
 202  * intel_xpower_pmic_get_raw_temp(): Get raw temperature reading from the PMIC
 203  *
 204  * @regmap: regmap of the PMIC device
 205  * @reg: register to get the reading
 206  *
 207  * Return a positive value on success, errno on failure.
 208  */
 209 static int intel_xpower_pmic_get_raw_temp(struct regmap *regmap, int reg)
 210 {
 211         u8 buf[2];
 212
 213         if (regmap_bulk_read(regmap, AXP288_GP_ADC_H, buf, 2))
 214                 return -EIO;
 215
 216         return (buf[0] << 4) + ((buf[1] >> 4) & 0x0F);
 217 }
 218
 219 static struct intel_pmic_opregion_data intel_xpower_pmic_opregion_data = {
 220         .get_power = intel_xpower_pmic_get_power,
 221         .update_power = intel_xpower_pmic_update_power,
 222         .get_raw_temp = intel_xpower_pmic_get_raw_temp,
 223         .power_table = power_table,
 224         .power_table_count = ARRAY_SIZE(power_table),
 225         .thermal_table = thermal_table,
 226         .thermal_table_count = ARRAY_SIZE(thermal_table),
 227 };
 228
 229 static acpi_status intel_xpower_pmic_gpio_handler(u32 function,
 230                 acpi_physical_address address, u32 bit_width, u64 *value,
 231                 void *handler_context, void *region_context)
 232 {
 233         return AE_OK;
 234 }
 235
 236 static int intel_xpower_pmic_opregion_probe(struct platform_device *pdev)
 237 {
 238         struct device *parent = pdev->dev.parent;
 239         struct axp20x_dev *axp20x = dev_get_drvdata(parent);
 240         acpi_status status;
 241         int result;
 242
 243         status = acpi_install_address_space_handler(ACPI_HANDLE(parent),
 244                         ACPI_ADR_SPACE_GPIO, intel_xpower_pmic_gpio_handler,
 245                         NULL, NULL);
 246         if (ACPI_FAILURE(status))
 247                 return -ENODEV;
 248
 249         result = intel_pmic_install_opregion_handler(&pdev->dev,
 250                                         ACPI_HANDLE(parent), axp20x->regmap,
 251                                         &intel_xpower_pmic_opregion_data);
 252         if (result)
 253                 acpi_remove_address_space_handler(ACPI_HANDLE(parent),
 254                                                   ACPI_ADR_SPACE_GPIO,
 255                                                   intel_xpower_pmic_gpio_handler);
 256
 257         return result;
 258 }
 259
 260 static struct platform_driver intel_xpower_pmic_opregion_driver = {
 261         .probe = intel_xpower_pmic_opregion_probe,
 262         .driver = {
 263                 .name = "axp288_pmic_acpi",
 264         },
 265 };
 266
 267 static int __init intel_xpower_pmic_opregion_driver_init(void)
 268 {
 269         return platform_driver_register(&intel_xpower_pmic_opregion_driver);
 270 }
 271 device_initcall(intel_xpower_pmic_opregion_driver_init);