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 const 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, const 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 const 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, ®, &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 = opregion->data->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 const 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 const 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, ®, &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 = -EINVAL; 215 216 if (function == ACPI_WRITE) { 217 switch (address) { 218 case 0: 219 return AE_OK; 220 case 1: 221 opregion->ctx.addr |= (*value64 & 0xff) << 8; 222 return AE_OK; 223 case 2: 224 opregion->ctx.addr |= *value64 & 0xff; 225 return AE_OK; 226 case 3: 227 opregion->ctx.val = *value64 & 0xff; 228 return AE_OK; 229 case 4: 230 if (*value64) { 231 result = regmap_write(opregion->regmap, opregion->ctx.addr, 232 opregion->ctx.val); 233 } else { 234 result = regmap_read(opregion->regmap, opregion->ctx.addr, 235 &opregion->ctx.val); 236 } 237 opregion->ctx.addr = 0; 238 } 239 } 240 241 if (function == ACPI_READ && address == 3) { 242 *value64 = opregion->ctx.val; 243 return AE_OK; 244 } 245 246 if (result < 0) { 247 if (result == -EINVAL) 248 return AE_BAD_PARAMETER; 249 else 250 return AE_ERROR; 251 } 252 253 return AE_OK; 254 } 255 256 int intel_pmic_install_opregion_handler(struct device *dev, acpi_handle handle, 257 struct regmap *regmap, 258 const struct intel_pmic_opregion_data *d) 259 { 260 acpi_status status = AE_OK; 261 struct intel_pmic_opregion *opregion; 262 int ret; 263 264 if (!dev || !regmap || !d) 265 return -EINVAL; 266 267 if (!handle) 268 return -ENODEV; 269 270 opregion = devm_kzalloc(dev, sizeof(*opregion), GFP_KERNEL); 271 if (!opregion) 272 return -ENOMEM; 273 274 mutex_init(&opregion->lock); 275 opregion->regmap = regmap; 276 opregion->lpat_table = acpi_lpat_get_conversion_table(handle); 277 278 if (d->power_table_count) 279 status = acpi_install_address_space_handler(handle, 280 PMIC_POWER_OPREGION_ID, 281 intel_pmic_power_handler, 282 NULL, opregion); 283 if (ACPI_FAILURE(status)) { 284 ret = -ENODEV; 285 goto out_error; 286 } 287 288 if (d->thermal_table_count) 289 status = acpi_install_address_space_handler(handle, 290 PMIC_THERMAL_OPREGION_ID, 291 intel_pmic_thermal_handler, 292 NULL, opregion); 293 if (ACPI_FAILURE(status)) { 294 ret = -ENODEV; 295 goto out_remove_power_handler; 296 } 297 298 status = acpi_install_address_space_handler(handle, 299 PMIC_REGS_OPREGION_ID, intel_pmic_regs_handler, NULL, 300 opregion); 301 if (ACPI_FAILURE(status)) { 302 ret = -ENODEV; 303 goto out_remove_thermal_handler; 304 } 305 306 opregion->data = d; 307 intel_pmic_opregion = opregion; 308 return 0; 309 310 out_remove_thermal_handler: 311 if (d->thermal_table_count) 312 acpi_remove_address_space_handler(handle, 313 PMIC_THERMAL_OPREGION_ID, 314 intel_pmic_thermal_handler); 315 316 out_remove_power_handler: 317 if (d->power_table_count) 318 acpi_remove_address_space_handler(handle, 319 PMIC_POWER_OPREGION_ID, 320 intel_pmic_power_handler); 321 322 out_error: 323 acpi_lpat_free_conversion_table(opregion->lpat_table); 324 return ret; 325 } 326 EXPORT_SYMBOL_GPL(intel_pmic_install_opregion_handler); 327 328 /** 329 * intel_soc_pmic_exec_mipi_pmic_seq_element - Execute PMIC MIPI sequence 330 * @i2c_address: I2C client address for the PMIC 331 * @reg_address: PMIC register address 332 * @value: New value for the register bits to change 333 * @mask: Mask indicating which register bits to change 334 * 335 * DSI LCD panels describe an initialization sequence in the i915 VBT (Video 336 * BIOS Tables) using so called MIPI sequences. One possible element in these 337 * sequences is a PMIC specific element of 15 bytes. 338 * 339 * This function executes these PMIC specific elements sending the embedded 340 * commands to the PMIC. 341 * 342 * Return 0 on success, < 0 on failure. 343 */ 344 int intel_soc_pmic_exec_mipi_pmic_seq_element(u16 i2c_address, u32 reg_address, 345 u32 value, u32 mask) 346 { 347 const struct intel_pmic_opregion_data *d; 348 int ret; 349 350 if (!intel_pmic_opregion) { 351 pr_warn("%s: No PMIC registered\n", __func__); 352 return -ENXIO; 353 } 354 355 d = intel_pmic_opregion->data; 356 357 mutex_lock(&intel_pmic_opregion->lock); 358 359 if (d->exec_mipi_pmic_seq_element) { 360 ret = d->exec_mipi_pmic_seq_element(intel_pmic_opregion->regmap, 361 i2c_address, reg_address, 362 value, mask); 363 } else if (d->pmic_i2c_address) { 364 if (i2c_address == d->pmic_i2c_address) { 365 ret = regmap_update_bits(intel_pmic_opregion->regmap, 366 reg_address, mask, value); 367 } else { 368 pr_err("%s: Unexpected i2c-addr: 0x%02x (reg-addr 0x%x value 0x%x mask 0x%x)\n", 369 __func__, i2c_address, reg_address, value, mask); 370 ret = -ENXIO; 371 } 372 } else { 373 pr_warn("%s: Not implemented\n", __func__); 374 pr_warn("%s: i2c-addr: 0x%x reg-addr 0x%x value 0x%x mask 0x%x\n", 375 __func__, i2c_address, reg_address, value, mask); 376 ret = -EOPNOTSUPP; 377 } 378 379 mutex_unlock(&intel_pmic_opregion->lock); 380 381 return ret; 382 } 383 EXPORT_SYMBOL_GPL(intel_soc_pmic_exec_mipi_pmic_seq_element); 384