drivers/acpi/pmic/intel_pmic.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * intel_pmic.c - Intel PMIC operation region driver
   4  *
   5  * Copyright (C) 2014 Intel Corporation. All rights reserved.
   6  */
   7
   8 #include <linux/export.h>
   9 #include <linux/acpi.h>
  10 #include <linux/mfd/intel_soc_pmic.h>
  11 #include <linux/regmap.h>
  12 #include <acpi/acpi_lpat.h>
  13 #include "intel_pmic.h"
  14
  15 #define PMIC_POWER_OPREGION_ID          0x8d
  16 #define PMIC_THERMAL_OPREGION_ID        0x8c
  17 #define PMIC_REGS_OPREGION_ID           0x8f
  18
  19 struct intel_pmic_regs_handler_ctx {
  20         unsigned int val;
  21         u16 addr;
  22 };
  23
  24 struct intel_pmic_opregion {
  25         struct mutex lock;
  26         struct acpi_lpat_conversion_table *lpat_table;
  27         struct regmap *regmap;
  28         struct intel_pmic_opregion_data *data;
  29         struct intel_pmic_regs_handler_ctx ctx;
  30 };
  31
  32 static struct intel_pmic_opregion *intel_pmic_opregion;
  33
  34 static int pmic_get_reg_bit(int address, struct pmic_table *table,
  35                             int count, int *reg, int *bit)
  36 {
  37         int i;
  38
  39         for (i = 0; i < count; i++) {
  40                 if (table[i].address == address) {
  41                         *reg = table[i].reg;
  42                         if (bit)
  43                                 *bit = table[i].bit;
  44                         return 0;
  45                 }
  46         }
  47         return -ENOENT;
  48 }
  49
  50 static acpi_status intel_pmic_power_handler(u32 function,
  51                 acpi_physical_address address, u32 bits, u64 *value64,
  52                 void *handler_context, void *region_context)
  53 {
  54         struct intel_pmic_opregion *opregion = region_context;
  55         struct regmap *regmap = opregion->regmap;
  56         struct intel_pmic_opregion_data *d = opregion->data;
  57         int reg, bit, result;
  58
  59         if (bits != 32 || !value64)
  60                 return AE_BAD_PARAMETER;
  61
  62         if (function == ACPI_WRITE && !(*value64 == 0 || *value64 == 1))
  63                 return AE_BAD_PARAMETER;
  64
  65         result = pmic_get_reg_bit(address, d->power_table,
  66                                   d->power_table_count, &reg, &bit);
  67         if (result == -ENOENT)
  68                 return AE_BAD_PARAMETER;
  69
  70         mutex_lock(&opregion->lock);
  71
  72         result = function == ACPI_READ ?
  73                 d->get_power(regmap, reg, bit, value64) :
  74                 d->update_power(regmap, reg, bit, *value64 == 1);
  75
  76         mutex_unlock(&opregion->lock);
  77
  78         return result ? AE_ERROR : AE_OK;
  79 }
  80
  81 static int pmic_read_temp(struct intel_pmic_opregion *opregion,
  82                           int reg, u64 *value)
  83 {
  84         int raw_temp, temp;
  85
  86         if (!opregion->data->get_raw_temp)
  87                 return -ENXIO;
  88
  89         raw_temp = opregion->data->get_raw_temp(opregion->regmap, reg);
  90         if (raw_temp < 0)
  91                 return raw_temp;
  92
  93         if (!opregion->lpat_table) {
  94                 *value = raw_temp;
  95                 return 0;
  96         }
  97
  98         temp = acpi_lpat_raw_to_temp(opregion->lpat_table, raw_temp);
  99         if (temp < 0)
 100                 return temp;
 101
 102         *value = temp;
 103         return 0;
 104 }
 105
 106 static int pmic_thermal_temp(struct intel_pmic_opregion *opregion, int reg,
 107                              u32 function, u64 *value)
 108 {
 109         return function == ACPI_READ ?
 110                 pmic_read_temp(opregion, reg, value) : -EINVAL;
 111 }
 112
 113 static int pmic_thermal_aux(struct intel_pmic_opregion *opregion, int reg,
 114                             u32 function, u64 *value)
 115 {
 116         int raw_temp;
 117
 118         if (function == ACPI_READ)
 119                 return pmic_read_temp(opregion, reg, value);
 120
 121         if (!opregion->data->update_aux)
 122                 return -ENXIO;
 123
 124         if (opregion->lpat_table) {
 125                 raw_temp = acpi_lpat_temp_to_raw(opregion->lpat_table, *value);
 126                 if (raw_temp < 0)
 127                         return raw_temp;
 128         } else {
 129                 raw_temp = *value;
 130         }
 131
 132         return opregion->data->update_aux(opregion->regmap, reg, raw_temp);
 133 }
 134
 135 static int pmic_thermal_pen(struct intel_pmic_opregion *opregion, int reg,
 136                             int bit, u32 function, u64 *value)
 137 {
 138         struct intel_pmic_opregion_data *d = opregion->data;
 139         struct regmap *regmap = opregion->regmap;
 140
 141         if (!d->get_policy || !d->update_policy)
 142                 return -ENXIO;
 143
 144         if (function == ACPI_READ)
 145                 return d->get_policy(regmap, reg, bit, value);
 146
 147         if (*value != 0 && *value != 1)
 148                 return -EINVAL;
 149
 150         return d->update_policy(regmap, reg, bit, *value);
 151 }
 152
 153 static bool pmic_thermal_is_temp(int address)
 154 {
 155         return (address <= 0x3c) && !(address % 12);
 156 }
 157
 158 static bool pmic_thermal_is_aux(int address)
 159 {
 160         return (address >= 4 && address <= 0x40 && !((address - 4) % 12)) ||
 161                (address >= 8 && address <= 0x44 && !((address - 8) % 12));
 162 }
 163
 164 static bool pmic_thermal_is_pen(int address)
 165 {
 166         return address >= 0x48 && address <= 0x5c;
 167 }
 168
 169 static acpi_status intel_pmic_thermal_handler(u32 function,
 170                 acpi_physical_address address, u32 bits, u64 *value64,
 171                 void *handler_context, void *region_context)
 172 {
 173         struct intel_pmic_opregion *opregion = region_context;
 174         struct intel_pmic_opregion_data *d = opregion->data;
 175         int reg, bit, result;
 176
 177         if (bits != 32 || !value64)
 178                 return AE_BAD_PARAMETER;
 179
 180         result = pmic_get_reg_bit(address, d->thermal_table,
 181                                   d->thermal_table_count, &reg, &bit);
 182         if (result == -ENOENT)
 183                 return AE_BAD_PARAMETER;
 184
 185         mutex_lock(&opregion->lock);
 186
 187         if (pmic_thermal_is_temp(address))
 188                 result = pmic_thermal_temp(opregion, reg, function, value64);
 189         else if (pmic_thermal_is_aux(address))
 190                 result = pmic_thermal_aux(opregion, reg, function, value64);
 191         else if (pmic_thermal_is_pen(address))
 192                 result = pmic_thermal_pen(opregion, reg, bit,
 193                                                 function, value64);
 194         else
 195                 result = -EINVAL;
 196
 197         mutex_unlock(&opregion->lock);
 198
 199         if (result < 0) {
 200                 if (result == -EINVAL)
 201                         return AE_BAD_PARAMETER;
 202                 else
 203                         return AE_ERROR;
 204         }
 205
 206         return AE_OK;
 207 }
 208
 209 static acpi_status intel_pmic_regs_handler(u32 function,
 210                 acpi_physical_address address, u32 bits, u64 *value64,
 211                 void *handler_context, void *region_context)
 212 {
 213         struct intel_pmic_opregion *opregion = region_context;
 214         int result = 0;
 215
 216         switch (address) {
 217         case 0:
 218                 return AE_OK;
 219         case 1:
 220                 opregion->ctx.addr |= (*value64 & 0xff) << 8;
 221                 return AE_OK;
 222         case 2:
 223                 opregion->ctx.addr |= *value64 & 0xff;
 224                 return AE_OK;
 225         case 3:
 226                 opregion->ctx.val = *value64 & 0xff;
 227                 return AE_OK;
 228         case 4:
 229                 if (*value64) {
 230                         result = regmap_write(opregion->regmap, opregion->ctx.addr,
 231                                               opregion->ctx.val);
 232                 } else {
 233                         result = regmap_read(opregion->regmap, opregion->ctx.addr,
 234                                              &opregion->ctx.val);
 235                         if (result == 0)
 236                                 *value64 = opregion->ctx.val;
 237                 }
 238                 memset(&opregion->ctx, 0x00, sizeof(opregion->ctx));
 239         }
 240
 241         if (result < 0) {
 242                 if (result == -EINVAL)
 243                         return AE_BAD_PARAMETER;
 244                 else
 245                         return AE_ERROR;
 246         }
 247
 248         return AE_OK;
 249 }
 250
 251 int intel_pmic_install_opregion_handler(struct device *dev, acpi_handle handle,
 252                                         struct regmap *regmap,
 253                                         struct intel_pmic_opregion_data *d)
 254 {
 255         acpi_status status;
 256         struct intel_pmic_opregion *opregion;
 257         int ret;
 258
 259         if (!dev || !regmap || !d)
 260                 return -EINVAL;
 261
 262         if (!handle)
 263                 return -ENODEV;
 264
 265         opregion = devm_kzalloc(dev, sizeof(*opregion), GFP_KERNEL);
 266         if (!opregion)
 267                 return -ENOMEM;
 268
 269         mutex_init(&opregion->lock);
 270         opregion->regmap = regmap;
 271         opregion->lpat_table = acpi_lpat_get_conversion_table(handle);
 272
 273         status = acpi_install_address_space_handler(handle,
 274                                                     PMIC_POWER_OPREGION_ID,
 275                                                     intel_pmic_power_handler,
 276                                                     NULL, opregion);
 277         if (ACPI_FAILURE(status)) {
 278                 ret = -ENODEV;
 279                 goto out_error;
 280         }
 281
 282         status = acpi_install_address_space_handler(handle,
 283                                                     PMIC_THERMAL_OPREGION_ID,
 284                                                     intel_pmic_thermal_handler,
 285                                                     NULL, opregion);
 286         if (ACPI_FAILURE(status)) {
 287                 ret = -ENODEV;
 288                 goto out_remove_power_handler;
 289         }
 290
 291         status = acpi_install_address_space_handler(handle,
 292                         PMIC_REGS_OPREGION_ID, intel_pmic_regs_handler, NULL,
 293                         opregion);
 294         if (ACPI_FAILURE(status)) {
 295                 ret = -ENODEV;
 296                 goto out_remove_thermal_handler;
 297         }
 298
 299         opregion->data = d;
 300         intel_pmic_opregion = opregion;
 301         return 0;
 302
 303 out_remove_thermal_handler:
 304         acpi_remove_address_space_handler(handle, PMIC_THERMAL_OPREGION_ID,
 305                                           intel_pmic_thermal_handler);
 306
 307 out_remove_power_handler:
 308         acpi_remove_address_space_handler(handle, PMIC_POWER_OPREGION_ID,
 309                                           intel_pmic_power_handler);
 310
 311 out_error:
 312         acpi_lpat_free_conversion_table(opregion->lpat_table);
 313         return ret;
 314 }
 315 EXPORT_SYMBOL_GPL(intel_pmic_install_opregion_handler);
 316
 317 /**
 318  * intel_soc_pmic_exec_mipi_pmic_seq_element - Execute PMIC MIPI sequence
 319  * @i2c_address:  I2C client address for the PMIC
 320  * @reg_address:  PMIC register address
 321  * @value:        New value for the register bits to change
 322  * @mask:         Mask indicating which register bits to change
 323  *
 324  * DSI LCD panels describe an initialization sequence in the i915 VBT (Video
 325  * BIOS Tables) using so called MIPI sequences. One possible element in these
 326  * sequences is a PMIC specific element of 15 bytes.
 327  *
 328  * This function executes these PMIC specific elements sending the embedded
 329  * commands to the PMIC.
 330  *
 331  * Return 0 on success, < 0 on failure.
 332  */
 333 int intel_soc_pmic_exec_mipi_pmic_seq_element(u16 i2c_address, u32 reg_address,
 334                                               u32 value, u32 mask)
 335 {
 336         struct intel_pmic_opregion_data *d;
 337         int ret;
 338
 339         if (!intel_pmic_opregion) {
 340                 pr_warn("%s: No PMIC registered\n", __func__);
 341                 return -ENXIO;
 342         }
 343
 344         d = intel_pmic_opregion->data;
 345
 346         mutex_lock(&intel_pmic_opregion->lock);
 347
 348         if (d->exec_mipi_pmic_seq_element) {
 349                 ret = d->exec_mipi_pmic_seq_element(intel_pmic_opregion->regmap,
 350                                                     i2c_address, reg_address,
 351                                                     value, mask);
 352         } else if (d->pmic_i2c_address) {
 353                 if (i2c_address == d->pmic_i2c_address) {
 354                         ret = regmap_update_bits(intel_pmic_opregion->regmap,
 355                                                  reg_address, mask, value);
 356                 } else {
 357                         pr_err("%s: Unexpected i2c-addr: 0x%02x (reg-addr 0x%x value 0x%x mask 0x%x)\n",
 358                                __func__, i2c_address, reg_address, value, mask);
 359                         ret = -ENXIO;
 360                 }
 361         } else {
 362                 pr_warn("%s: Not implemented\n", __func__);
 363                 pr_warn("%s: i2c-addr: 0x%x reg-addr 0x%x value 0x%x mask 0x%x\n",
 364                         __func__, i2c_address, reg_address, value, mask);
 365                 ret = -EOPNOTSUPP;
 366         }
 367
 368         mutex_unlock(&intel_pmic_opregion->lock);
 369
 370         return ret;
 371 }
 372 EXPORT_SYMBOL_GPL(intel_soc_pmic_exec_mipi_pmic_seq_element);