pmic/intel_pmic_xpower.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * XPower AXP288 PMIC operation region driver
   4  *
   5  * Copyright (C) 2014 Intel Corporation. All rights reserved.
   6  */
   7
   8 #include <linux/acpi.h>
   9 #include <linux/init.h>
  10 #include <linux/mfd/axp20x.h>
  11 #include <linux/regmap.h>
  12 #include <linux/platform_device.h>
  13 #include <asm/iosf_mbi.h>
  14 #include "intel_pmic.h"
  15
  16 #define XPOWER_GPADC_LOW        0x5b
  17 #define XPOWER_GPI1_CTRL        0x92
  18
  19 #define GPI1_LDO_MASK           GENMASK(2, 0)
  20 #define GPI1_LDO_ON             (3 << 0)
  21 #define GPI1_LDO_OFF            (4 << 0)
  22
  23 #define AXP288_ADC_TS_CURRENT_ON_OFF_MASK               GENMASK(1, 0)
  24 #define AXP288_ADC_TS_CURRENT_OFF                       (0 << 0)
  25 #define AXP288_ADC_TS_CURRENT_ON_WHEN_CHARGING          (1 << 0)
  26 #define AXP288_ADC_TS_CURRENT_ON_ONDEMAND               (2 << 0)
  27 #define AXP288_ADC_TS_CURRENT_ON                        (3 << 0)
  28
  29 static struct pmic_table power_table[] = {
  30         {
  31                 .address = 0x00,
  32                 .reg = 0x13,
  33                 .bit = 0x05,
  34         }, /* ALD1 */
  35         {
  36                 .address = 0x04,
  37                 .reg = 0x13,
  38                 .bit = 0x06,
  39         }, /* ALD2 */
  40         {
  41                 .address = 0x08,
  42                 .reg = 0x13,
  43                 .bit = 0x07,
  44         }, /* ALD3 */
  45         {
  46                 .address = 0x0c,
  47                 .reg = 0x12,
  48                 .bit = 0x03,
  49         }, /* DLD1 */
  50         {
  51                 .address = 0x10,
  52                 .reg = 0x12,
  53                 .bit = 0x04,
  54         }, /* DLD2 */
  55         {
  56                 .address = 0x14,
  57                 .reg = 0x12,
  58                 .bit = 0x05,
  59         }, /* DLD3 */
  60         {
  61                 .address = 0x18,
  62                 .reg = 0x12,
  63                 .bit = 0x06,
  64         }, /* DLD4 */
  65         {
  66                 .address = 0x1c,
  67                 .reg = 0x12,
  68                 .bit = 0x00,
  69         }, /* ELD1 */
  70         {
  71                 .address = 0x20,
  72                 .reg = 0x12,
  73                 .bit = 0x01,
  74         }, /* ELD2 */
  75         {
  76                 .address = 0x24,
  77                 .reg = 0x12,
  78                 .bit = 0x02,
  79         }, /* ELD3 */
  80         {
  81                 .address = 0x28,
  82                 .reg = 0x13,
  83                 .bit = 0x02,
  84         }, /* FLD1 */
  85         {
  86                 .address = 0x2c,
  87                 .reg = 0x13,
  88                 .bit = 0x03,
  89         }, /* FLD2 */
  90         {
  91                 .address = 0x30,
  92                 .reg = 0x13,
  93                 .bit = 0x04,
  94         }, /* FLD3 */
  95         {
  96                 .address = 0x34,
  97                 .reg = 0x10,
  98                 .bit = 0x03,
  99         }, /* BUC1 */
 100         {
 101                 .address = 0x38,
 102                 .reg = 0x10,
 103                 .bit = 0x06,
 104         }, /* BUC2 */
 105         {
 106                 .address = 0x3c,
 107                 .reg = 0x10,
 108                 .bit = 0x05,
 109         }, /* BUC3 */
 110         {
 111                 .address = 0x40,
 112                 .reg = 0x10,
 113                 .bit = 0x04,
 114         }, /* BUC4 */
 115         {
 116                 .address = 0x44,
 117                 .reg = 0x10,
 118                 .bit = 0x01,
 119         }, /* BUC5 */
 120         {
 121                 .address = 0x48,
 122                 .reg = 0x10,
 123                 .bit = 0x00
 124         }, /* BUC6 */
 125         {
 126                 .address = 0x4c,
 127                 .reg = 0x92,
 128         }, /* GPI1 */
 129 };
 130
 131 /* TMP0 - TMP5 are the same, all from GPADC */
 132 static struct pmic_table thermal_table[] = {
 133         {
 134                 .address = 0x00,
 135                 .reg = XPOWER_GPADC_LOW
 136         },
 137         {
 138                 .address = 0x0c,
 139                 .reg = XPOWER_GPADC_LOW
 140         },
 141         {
 142                 .address = 0x18,
 143                 .reg = XPOWER_GPADC_LOW
 144         },
 145         {
 146                 .address = 0x24,
 147                 .reg = XPOWER_GPADC_LOW
 148         },
 149         {
 150                 .address = 0x30,
 151                 .reg = XPOWER_GPADC_LOW
 152         },
 153         {
 154                 .address = 0x3c,
 155                 .reg = XPOWER_GPADC_LOW
 156         },
 157 };
 158
 159 static int intel_xpower_pmic_get_power(struct regmap *regmap, int reg,
 160                                        int bit, u64 *value)
 161 {
 162         int data;
 163
 164         if (regmap_read(regmap, reg, &data))
 165                 return -EIO;
 166
 167         /* GPIO1 LDO regulator needs special handling */
 168         if (reg == XPOWER_GPI1_CTRL)
 169                 *value = ((data & GPI1_LDO_MASK) == GPI1_LDO_ON);
 170         else
 171                 *value = (data & BIT(bit)) ? 1 : 0;
 172
 173         return 0;
 174 }
 175
 176 static int intel_xpower_pmic_update_power(struct regmap *regmap, int reg,
 177                                           int bit, bool on)
 178 {
 179         int data, ret;
 180
 181         ret = iosf_mbi_block_punit_i2c_access();
 182         if (ret)
 183                 return ret;
 184
 185         /* GPIO1 LDO regulator needs special handling */
 186         if (reg == XPOWER_GPI1_CTRL) {
 187                 ret = regmap_update_bits(regmap, reg, GPI1_LDO_MASK,
 188                                          on ? GPI1_LDO_ON : GPI1_LDO_OFF);
 189                 goto out;
 190         }
 191
 192         if (regmap_read(regmap, reg, &data)) {
 193                 ret = -EIO;
 194                 goto out;
 195         }
 196
 197         if (on)
 198                 data |= BIT(bit);
 199         else
 200                 data &= ~BIT(bit);
 201
 202         if (regmap_write(regmap, reg, data))
 203                 ret = -EIO;
 204 out:
 205         iosf_mbi_unblock_punit_i2c_access();
 206
 207         return ret;
 208 }
 209
 210 /**
 211  * intel_xpower_pmic_get_raw_temp(): Get raw temperature reading from the PMIC
 212  *
 213  * @regmap: regmap of the PMIC device
 214  * @reg: register to get the reading
 215  *
 216  * Return a positive value on success, errno on failure.
 217  */
 218 static int intel_xpower_pmic_get_raw_temp(struct regmap *regmap, int reg)
 219 {
 220         int ret, adc_ts_pin_ctrl;
 221         u8 buf[2];
 222
 223         /*
 224          * The current-source used for the battery temp-sensor (TS) is shared
 225          * with the GPADC. For proper fuel-gauge and charger operation the TS
 226          * current-source needs to be permanently on. But to read the GPADC we
 227          * need to temporary switch the TS current-source to ondemand, so that
 228          * the GPADC can use it, otherwise we will always read an all 0 value.
 229          *
 230          * Note that the switching from on to on-ondemand is not necessary
 231          * when the TS current-source is off (this happens on devices which
 232          * do not use the TS-pin).
 233          */
 234         ret = regmap_read(regmap, AXP288_ADC_TS_PIN_CTRL, &adc_ts_pin_ctrl);
 235         if (ret)
 236                 return ret;
 237
 238         if (adc_ts_pin_ctrl & AXP288_ADC_TS_CURRENT_ON_OFF_MASK) {
 239                 /*
 240                  * AXP288_ADC_TS_PIN_CTRL reads are cached by the regmap, so
 241                  * this does to a single I2C-transfer, and thus there is no
 242                  * need to explicitly call iosf_mbi_block_punit_i2c_access().
 243                  */
 244                 ret = regmap_update_bits(regmap, AXP288_ADC_TS_PIN_CTRL,
 245                                          AXP288_ADC_TS_CURRENT_ON_OFF_MASK,
 246                                          AXP288_ADC_TS_CURRENT_ON_ONDEMAND);
 247                 if (ret)
 248                         return ret;
 249
 250                 /* Wait a bit after switching the current-source */
 251                 usleep_range(6000, 10000);
 252         }
 253
 254         ret = iosf_mbi_block_punit_i2c_access();
 255         if (ret)
 256                 return ret;
 257
 258         ret = regmap_bulk_read(regmap, AXP288_GP_ADC_H, buf, 2);
 259         if (ret == 0)
 260                 ret = (buf[0] << 4) + ((buf[1] >> 4) & 0x0f);
 261
 262         if (adc_ts_pin_ctrl & AXP288_ADC_TS_CURRENT_ON_OFF_MASK) {
 263                 regmap_update_bits(regmap, AXP288_ADC_TS_PIN_CTRL,
 264                                    AXP288_ADC_TS_CURRENT_ON_OFF_MASK,
 265                                    AXP288_ADC_TS_CURRENT_ON);
 266         }
 267
 268         iosf_mbi_unblock_punit_i2c_access();
 269
 270         return ret;
 271 }
 272
 273 static int intel_xpower_exec_mipi_pmic_seq_element(struct regmap *regmap,
 274                                                    u16 i2c_address, u32 reg_address,
 275                                                    u32 value, u32 mask)
 276 {
 277         int ret;
 278
 279         if (i2c_address != 0x34) {
 280                 pr_err("%s: Unexpected i2c-addr: 0x%02x (reg-addr 0x%x value 0x%x mask 0x%x)\n",
 281                        __func__, i2c_address, reg_address, value, mask);
 282                 return -ENXIO;
 283         }
 284
 285         ret = iosf_mbi_block_punit_i2c_access();
 286         if (ret)
 287                 return ret;
 288
 289         ret = regmap_update_bits(regmap, reg_address, mask, value);
 290
 291         iosf_mbi_unblock_punit_i2c_access();
 292
 293         return ret;
 294 }
 295
 296 static int intel_xpower_lpat_raw_to_temp(struct acpi_lpat_conversion_table *lpat_table,
 297                                          int raw)
 298 {
 299         struct acpi_lpat first = lpat_table->lpat[0];
 300         struct acpi_lpat last = lpat_table->lpat[lpat_table->lpat_count - 1];
 301
 302         /*
 303          * Some LPAT tables in the ACPI Device for the AXP288 PMIC for some
 304          * reason only describe a small temperature range, e.g. 27° - 37°
 305          * Celcius. Resulting in errors when the tablet is idle in a cool room.
 306          *
 307          * To avoid these errors clamp the raw value to be inside the LPAT.
 308          */
 309         if (first.raw < last.raw)
 310                 raw = clamp(raw, first.raw, last.raw);
 311         else
 312                 raw = clamp(raw, last.raw, first.raw);
 313
 314         return acpi_lpat_raw_to_temp(lpat_table, raw);
 315 }
 316
 317 static const struct intel_pmic_opregion_data intel_xpower_pmic_opregion_data = {
 318         .get_power = intel_xpower_pmic_get_power,
 319         .update_power = intel_xpower_pmic_update_power,
 320         .get_raw_temp = intel_xpower_pmic_get_raw_temp,
 321         .exec_mipi_pmic_seq_element = intel_xpower_exec_mipi_pmic_seq_element,
 322         .lpat_raw_to_temp = intel_xpower_lpat_raw_to_temp,
 323         .power_table = power_table,
 324         .power_table_count = ARRAY_SIZE(power_table),
 325         .thermal_table = thermal_table,
 326         .thermal_table_count = ARRAY_SIZE(thermal_table),
 327         .pmic_i2c_address = 0x34,
 328 };
 329
 330 static acpi_status intel_xpower_pmic_gpio_handler(u32 function,
 331                 acpi_physical_address address, u32 bit_width, u64 *value,
 332                 void *handler_context, void *region_context)
 333 {
 334         return AE_OK;
 335 }
 336
 337 static int intel_xpower_pmic_opregion_probe(struct platform_device *pdev)
 338 {
 339         struct device *parent = pdev->dev.parent;
 340         struct axp20x_dev *axp20x = dev_get_drvdata(parent);
 341         acpi_status status;
 342         int result;
 343
 344         status = acpi_install_address_space_handler(ACPI_HANDLE(parent),
 345                         ACPI_ADR_SPACE_GPIO, intel_xpower_pmic_gpio_handler,
 346                         NULL, NULL);
 347         if (ACPI_FAILURE(status))
 348                 return -ENODEV;
 349
 350         result = intel_pmic_install_opregion_handler(&pdev->dev,
 351                                         ACPI_HANDLE(parent), axp20x->regmap,
 352                                         &intel_xpower_pmic_opregion_data);
 353         if (result)
 354                 acpi_remove_address_space_handler(ACPI_HANDLE(parent),
 355                                                   ACPI_ADR_SPACE_GPIO,
 356                                                   intel_xpower_pmic_gpio_handler);
 357
 358         return result;
 359 }
 360
 361 static struct platform_driver intel_xpower_pmic_opregion_driver = {
 362         .probe = intel_xpower_pmic_opregion_probe,
 363         .driver = {
 364                 .name = "axp288_pmic_acpi",
 365         },
 366 };
 367 builtin_platform_driver(intel_xpower_pmic_opregion_driver);