drivers/acpi/pmic/intel_pmic_crc.c

   1 /*
   2  * intel_pmic_crc.c - Intel CrystalCove 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/module.h>
  17 #include <linux/acpi.h>
  18 #include <linux/mfd/intel_soc_pmic.h>
  19 #include <linux/regmap.h>
  20 #include <linux/platform_device.h>
  21 #include "intel_pmic.h"
  22
  23 #define PWR_SOURCE_SELECT       BIT(1)
  24
  25 #define PMIC_A0LOCK_REG         0xc5
  26
  27 static struct pmic_table power_table[] = {
  28         {
  29                 .address = 0x24,
  30                 .reg = 0x66,
  31                 .bit = 0x00,
  32         },
  33         {
  34                 .address = 0x48,
  35                 .reg = 0x5d,
  36                 .bit = 0x00,
  37         },
  38 };
  39
  40 static struct pmic_table thermal_table[] = {
  41         {
  42                 .address = 0x00,
  43                 .reg = 0x75
  44         },
  45         {
  46                 .address = 0x04,
  47                 .reg = 0x95
  48         },
  49         {
  50                 .address = 0x08,
  51                 .reg = 0x97
  52         },
  53         {
  54                 .address = 0x0c,
  55                 .reg = 0x77
  56         },
  57         {
  58                 .address = 0x10,
  59                 .reg = 0x9a
  60         },
  61         {
  62                 .address = 0x14,
  63                 .reg = 0x9c
  64         },
  65         {
  66                 .address = 0x18,
  67                 .reg = 0x79
  68         },
  69         {
  70                 .address = 0x1c,
  71                 .reg = 0x9f
  72         },
  73         {
  74                 .address = 0x20,
  75                 .reg = 0xa1
  76         },
  77         {
  78                 .address = 0x48,
  79                 .reg = 0x94
  80         },
  81         {
  82                 .address = 0x4c,
  83                 .reg = 0x99
  84         },
  85         {
  86                 .address = 0x50,
  87                 .reg = 0x9e
  88         },
  89 };
  90
  91 static int intel_crc_pmic_get_power(struct regmap *regmap, int reg,
  92                                     int bit, u64 *value)
  93 {
  94         int data;
  95
  96         if (regmap_read(regmap, reg, &data))
  97                 return -EIO;
  98
  99         *value = (data & PWR_SOURCE_SELECT) && (data & BIT(bit)) ? 1 : 0;
 100         return 0;
 101 }
 102
 103 static int intel_crc_pmic_update_power(struct regmap *regmap, int reg,
 104                                        int bit, bool on)
 105 {
 106         int data;
 107
 108         if (regmap_read(regmap, reg, &data))
 109                 return -EIO;
 110
 111         if (on) {
 112                 data |= PWR_SOURCE_SELECT | BIT(bit);
 113         } else {
 114                 data &= ~BIT(bit);
 115                 data |= PWR_SOURCE_SELECT;
 116         }
 117
 118         if (regmap_write(regmap, reg, data))
 119                 return -EIO;
 120         return 0;
 121 }
 122
 123 static int intel_crc_pmic_get_raw_temp(struct regmap *regmap, int reg)
 124 {
 125         int temp_l, temp_h;
 126
 127         /*
 128          * Raw temperature value is 10bits: 8bits in reg
 129          * and 2bits in reg-1: bit0,1
 130          */
 131         if (regmap_read(regmap, reg, &temp_l) ||
 132             regmap_read(regmap, reg - 1, &temp_h))
 133                 return -EIO;
 134
 135         return temp_l | (temp_h & 0x3) << 8;
 136 }
 137
 138 static int intel_crc_pmic_update_aux(struct regmap *regmap, int reg, int raw)
 139 {
 140         return regmap_write(regmap, reg, raw) ||
 141                 regmap_update_bits(regmap, reg - 1, 0x3, raw >> 8) ? -EIO : 0;
 142 }
 143
 144 static int intel_crc_pmic_get_policy(struct regmap *regmap, int reg, u64 *value)
 145 {
 146         int pen;
 147
 148         if (regmap_read(regmap, reg, &pen))
 149                 return -EIO;
 150         *value = pen >> 7;
 151         return 0;
 152 }
 153
 154 static int intel_crc_pmic_update_policy(struct regmap *regmap,
 155                                         int reg, int enable)
 156 {
 157         int alert0;
 158
 159         /* Update to policy enable bit requires unlocking a0lock */
 160         if (regmap_read(regmap, PMIC_A0LOCK_REG, &alert0))
 161                 return -EIO;
 162
 163         if (regmap_update_bits(regmap, PMIC_A0LOCK_REG, 0x01, 0))
 164                 return -EIO;
 165
 166         if (regmap_update_bits(regmap, reg, 0x80, enable << 7))
 167                 return -EIO;
 168
 169         /* restore alert0 */
 170         if (regmap_write(regmap, PMIC_A0LOCK_REG, alert0))
 171                 return -EIO;
 172
 173         return 0;
 174 }
 175
 176 static struct intel_pmic_opregion_data intel_crc_pmic_opregion_data = {
 177         .get_power      = intel_crc_pmic_get_power,
 178         .update_power   = intel_crc_pmic_update_power,
 179         .get_raw_temp   = intel_crc_pmic_get_raw_temp,
 180         .update_aux     = intel_crc_pmic_update_aux,
 181         .get_policy     = intel_crc_pmic_get_policy,
 182         .update_policy  = intel_crc_pmic_update_policy,
 183         .power_table    = power_table,
 184         .power_table_count= ARRAY_SIZE(power_table),
 185         .thermal_table  = thermal_table,
 186         .thermal_table_count = ARRAY_SIZE(thermal_table),
 187 };
 188
 189 static int intel_crc_pmic_opregion_probe(struct platform_device *pdev)
 190 {
 191         struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
 192         return intel_pmic_install_opregion_handler(&pdev->dev,
 193                         ACPI_HANDLE(pdev->dev.parent), pmic->regmap,
 194                         &intel_crc_pmic_opregion_data);
 195 }
 196
 197 static struct platform_driver intel_crc_pmic_opregion_driver = {
 198         .probe = intel_crc_pmic_opregion_probe,
 199         .driver = {
 200                 .name = "crystal_cove_pmic",
 201         },
 202 };
 203
 204 static int __init intel_crc_pmic_opregion_driver_init(void)
 205 {
 206         return platform_driver_register(&intel_crc_pmic_opregion_driver);
 207 }
 208 module_init(intel_crc_pmic_opregion_driver_init);
 209
 210 MODULE_DESCRIPTION("CrystalCove ACPI operation region driver");
 211 MODULE_LICENSE("GPL");