kernel/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/module.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 <linux/iio/consumer.h>
  22 #include "intel_pmic.h"
  23
  24 #define XPOWER_GPADC_LOW        0x5b
  25
  26 static struct pmic_table power_table[] = {
  27         {
  28                 .address = 0x00,
  29                 .reg = 0x13,
  30                 .bit = 0x05,
  31         },
  32         {
  33                 .address = 0x04,
  34                 .reg = 0x13,
  35                 .bit = 0x06,
  36         },
  37         {
  38                 .address = 0x08,
  39                 .reg = 0x13,
  40                 .bit = 0x07,
  41         },
  42         {
  43                 .address = 0x0c,
  44                 .reg = 0x12,
  45                 .bit = 0x03,
  46         },
  47         {
  48                 .address = 0x10,
  49                 .reg = 0x12,
  50                 .bit = 0x04,
  51         },
  52         {
  53                 .address = 0x14,
  54                 .reg = 0x12,
  55                 .bit = 0x05,
  56         },
  57         {
  58                 .address = 0x18,
  59                 .reg = 0x12,
  60                 .bit = 0x06,
  61         },
  62         {
  63                 .address = 0x1c,
  64                 .reg = 0x12,
  65                 .bit = 0x00,
  66         },
  67         {
  68                 .address = 0x20,
  69                 .reg = 0x12,
  70                 .bit = 0x01,
  71         },
  72         {
  73                 .address = 0x24,
  74                 .reg = 0x12,
  75                 .bit = 0x02,
  76         },
  77         {
  78                 .address = 0x28,
  79                 .reg = 0x13,
  80                 .bit = 0x02,
  81         },
  82         {
  83                 .address = 0x2c,
  84                 .reg = 0x13,
  85                 .bit = 0x03,
  86         },
  87         {
  88                 .address = 0x30,
  89                 .reg = 0x13,
  90                 .bit = 0x04,
  91         },
  92         {
  93                 .address = 0x38,
  94                 .reg = 0x10,
  95                 .bit = 0x03,
  96         },
  97         {
  98                 .address = 0x3c,
  99                 .reg = 0x10,
 100                 .bit = 0x06,
 101         },
 102         {
 103                 .address = 0x40,
 104                 .reg = 0x10,
 105                 .bit = 0x05,
 106         },
 107         {
 108                 .address = 0x44,
 109                 .reg = 0x10,
 110                 .bit = 0x04,
 111         },
 112         {
 113                 .address = 0x48,
 114                 .reg = 0x10,
 115                 .bit = 0x01,
 116         },
 117         {
 118                 .address = 0x4c,
 119                 .reg = 0x10,
 120                 .bit = 0x00
 121         },
 122 };
 123
 124 /* TMP0 - TMP5 are the same, all from GPADC */
 125 static struct pmic_table thermal_table[] = {
 126         {
 127                 .address = 0x00,
 128                 .reg = XPOWER_GPADC_LOW
 129         },
 130         {
 131                 .address = 0x0c,
 132                 .reg = XPOWER_GPADC_LOW
 133         },
 134         {
 135                 .address = 0x18,
 136                 .reg = XPOWER_GPADC_LOW
 137         },
 138         {
 139                 .address = 0x24,
 140                 .reg = XPOWER_GPADC_LOW
 141         },
 142         {
 143                 .address = 0x30,
 144                 .reg = XPOWER_GPADC_LOW
 145         },
 146         {
 147                 .address = 0x3c,
 148                 .reg = XPOWER_GPADC_LOW
 149         },
 150 };
 151
 152 static int intel_xpower_pmic_get_power(struct regmap *regmap, int reg,
 153                                        int bit, u64 *value)
 154 {
 155         int data;
 156
 157         if (regmap_read(regmap, reg, &data))
 158                 return -EIO;
 159
 160         *value = (data & BIT(bit)) ? 1 : 0;
 161         return 0;
 162 }
 163
 164 static int intel_xpower_pmic_update_power(struct regmap *regmap, int reg,
 165                                           int bit, bool on)
 166 {
 167         int data;
 168
 169         if (regmap_read(regmap, reg, &data))
 170                 return -EIO;
 171
 172         if (on)
 173                 data |= BIT(bit);
 174         else
 175                 data &= ~BIT(bit);
 176
 177         if (regmap_write(regmap, reg, data))
 178                 return -EIO;
 179
 180         return 0;
 181 }
 182
 183 /**
 184  * intel_xpower_pmic_get_raw_temp(): Get raw temperature reading from the PMIC
 185  *
 186  * @regmap: regmap of the PMIC device
 187  * @reg: register to get the reading
 188  *
 189  * We could get the sensor value by manipulating the HW regs here, but since
 190  * the axp288 IIO driver may also access the same regs at the same time, the
 191  * APIs provided by IIO subsystem are used here instead to avoid problems. As
 192  * a result, the two passed in params are of no actual use.
 193  *
 194  * Return a positive value on success, errno on failure.
 195  */
 196 static int intel_xpower_pmic_get_raw_temp(struct regmap *regmap, int reg)
 197 {
 198         struct iio_channel *gpadc_chan;
 199         int ret, val;
 200
 201         gpadc_chan = iio_channel_get(NULL, "axp288-system-temp");
 202         if (IS_ERR_OR_NULL(gpadc_chan))
 203                 return -EACCES;
 204
 205         ret = iio_read_channel_raw(gpadc_chan, &val);
 206         if (ret < 0)
 207                 val = ret;
 208
 209         iio_channel_release(gpadc_chan);
 210         return val;
 211 }
 212
 213 static struct intel_pmic_opregion_data intel_xpower_pmic_opregion_data = {
 214         .get_power = intel_xpower_pmic_get_power,
 215         .update_power = intel_xpower_pmic_update_power,
 216         .get_raw_temp = intel_xpower_pmic_get_raw_temp,
 217         .power_table = power_table,
 218         .power_table_count = ARRAY_SIZE(power_table),
 219         .thermal_table = thermal_table,
 220         .thermal_table_count = ARRAY_SIZE(thermal_table),
 221 };
 222
 223 static acpi_status intel_xpower_pmic_gpio_handler(u32 function,
 224                 acpi_physical_address address, u32 bit_width, u64 *value,
 225                 void *handler_context, void *region_context)
 226 {
 227         return AE_OK;
 228 }
 229
 230 static int intel_xpower_pmic_opregion_probe(struct platform_device *pdev)
 231 {
 232         struct device *parent = pdev->dev.parent;
 233         struct axp20x_dev *axp20x = dev_get_drvdata(parent);
 234         acpi_status status;
 235         int result;
 236
 237         status = acpi_install_address_space_handler(ACPI_HANDLE(parent),
 238                         ACPI_ADR_SPACE_GPIO, intel_xpower_pmic_gpio_handler,
 239                         NULL, NULL);
 240         if (ACPI_FAILURE(status))
 241                 return -ENODEV;
 242
 243         result = intel_pmic_install_opregion_handler(&pdev->dev,
 244                                         ACPI_HANDLE(parent), axp20x->regmap,
 245                                         &intel_xpower_pmic_opregion_data);
 246         if (result)
 247                 acpi_remove_address_space_handler(ACPI_HANDLE(parent),
 248                                                   ACPI_ADR_SPACE_GPIO,
 249                                                   intel_xpower_pmic_gpio_handler);
 250
 251         return result;
 252 }
 253
 254 static struct platform_driver intel_xpower_pmic_opregion_driver = {
 255         .probe = intel_xpower_pmic_opregion_probe,
 256         .driver = {
 257                 .name = "axp288_pmic_acpi",
 258         },
 259 };
 260
 261 static int __init intel_xpower_pmic_opregion_driver_init(void)
 262 {
 263         return platform_driver_register(&intel_xpower_pmic_opregion_driver);
 264 }
 265 module_init(intel_xpower_pmic_opregion_driver_init);
 266
 267 MODULE_DESCRIPTION("XPower AXP288 ACPI operation region driver");
 268 MODULE_LICENSE("GPL");