drivers/mfd/tps65218.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Driver for TPS65218 Integrated power management chipsets
   4  *
   5  * Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com/
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/device.h>
  10 #include <linux/module.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/init.h>
  13 #include <linux/i2c.h>
  14 #include <linux/slab.h>
  15 #include <linux/regmap.h>
  16 #include <linux/err.h>
  17 #include <linux/of.h>
  18 #include <linux/of_device.h>
  19 #include <linux/irq.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/mutex.h>
  22
  23 #include <linux/mfd/core.h>
  24 #include <linux/mfd/tps65218.h>
  25
  26 #define TPS65218_PASSWORD_REGS_UNLOCK   0x7D
  27
  28 static const struct mfd_cell tps65218_cells[] = {
  29         {
  30                 .name = "tps65218-pwrbutton",
  31                 .of_compatible = "ti,tps65218-pwrbutton",
  32         },
  33         {
  34                 .name = "tps65218-gpio",
  35                 .of_compatible = "ti,tps65218-gpio",
  36         },
  37         { .name = "tps65218-regulator", },
  38 };
  39
  40 /**
  41  * tps65218_reg_write: Write a single tps65218 register.
  42  *
  43  * @tps: Device to write to.
  44  * @reg: Register to write to.
  45  * @val: Value to write.
  46  * @level: Password protected level
  47  */
  48 int tps65218_reg_write(struct tps65218 *tps, unsigned int reg,
  49                         unsigned int val, unsigned int level)
  50 {
  51         int ret;
  52         unsigned int xor_reg_val;
  53
  54         switch (level) {
  55         case TPS65218_PROTECT_NONE:
  56                 return regmap_write(tps->regmap, reg, val);
  57         case TPS65218_PROTECT_L1:
  58                 xor_reg_val = reg ^ TPS65218_PASSWORD_REGS_UNLOCK;
  59                 ret = regmap_write(tps->regmap, TPS65218_REG_PASSWORD,
  60                                                         xor_reg_val);
  61                 if (ret < 0)
  62                         return ret;
  63
  64                 return regmap_write(tps->regmap, reg, val);
  65         default:
  66                 return -EINVAL;
  67         }
  68 }
  69 EXPORT_SYMBOL_GPL(tps65218_reg_write);
  70
  71 /**
  72  * tps65218_update_bits: Modify bits w.r.t mask, val and level.
  73  *
  74  * @tps: Device to write to.
  75  * @reg: Register to read-write to.
  76  * @mask: Mask.
  77  * @val: Value to write.
  78  * @level: Password protected level
  79  */
  80 static int tps65218_update_bits(struct tps65218 *tps, unsigned int reg,
  81                 unsigned int mask, unsigned int val, unsigned int level)
  82 {
  83         int ret;
  84         unsigned int data;
  85
  86         ret = regmap_read(tps->regmap, reg, &data);
  87         if (ret) {
  88                 dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
  89                 return ret;
  90         }
  91
  92         data &= ~mask;
  93         data |= val & mask;
  94
  95         mutex_lock(&tps->tps_lock);
  96         ret = tps65218_reg_write(tps, reg, data, level);
  97         if (ret)
  98                 dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
  99         mutex_unlock(&tps->tps_lock);
 100
 101         return ret;
 102 }
 103
 104 int tps65218_set_bits(struct tps65218 *tps, unsigned int reg,
 105                 unsigned int mask, unsigned int val, unsigned int level)
 106 {
 107         return tps65218_update_bits(tps, reg, mask, val, level);
 108 }
 109 EXPORT_SYMBOL_GPL(tps65218_set_bits);
 110
 111 int tps65218_clear_bits(struct tps65218 *tps, unsigned int reg,
 112                 unsigned int mask, unsigned int level)
 113 {
 114         return tps65218_update_bits(tps, reg, mask, 0, level);
 115 }
 116 EXPORT_SYMBOL_GPL(tps65218_clear_bits);
 117
 118 static const struct regmap_range tps65218_yes_ranges[] = {
 119         regmap_reg_range(TPS65218_REG_INT1, TPS65218_REG_INT2),
 120         regmap_reg_range(TPS65218_REG_STATUS, TPS65218_REG_STATUS),
 121 };
 122
 123 static const struct regmap_access_table tps65218_volatile_table = {
 124         .yes_ranges = tps65218_yes_ranges,
 125         .n_yes_ranges = ARRAY_SIZE(tps65218_yes_ranges),
 126 };
 127
 128 static const struct regmap_config tps65218_regmap_config = {
 129         .reg_bits = 8,
 130         .val_bits = 8,
 131         .cache_type = REGCACHE_RBTREE,
 132         .volatile_table = &tps65218_volatile_table,
 133 };
 134
 135 static const struct regmap_irq tps65218_irqs[] = {
 136         /* INT1 IRQs */
 137         [TPS65218_PRGC_IRQ] = {
 138                 .mask = TPS65218_INT1_PRGC,
 139         },
 140         [TPS65218_CC_AQC_IRQ] = {
 141                 .mask = TPS65218_INT1_CC_AQC,
 142         },
 143         [TPS65218_HOT_IRQ] = {
 144                 .mask = TPS65218_INT1_HOT,
 145         },
 146         [TPS65218_PB_IRQ] = {
 147                 .mask = TPS65218_INT1_PB,
 148         },
 149         [TPS65218_AC_IRQ] = {
 150                 .mask = TPS65218_INT1_AC,
 151         },
 152         [TPS65218_VPRG_IRQ] = {
 153                 .mask = TPS65218_INT1_VPRG,
 154         },
 155         [TPS65218_INVALID1_IRQ] = {
 156         },
 157         [TPS65218_INVALID2_IRQ] = {
 158         },
 159         /* INT2 IRQs*/
 160         [TPS65218_LS1_I_IRQ] = {
 161                 .mask = TPS65218_INT2_LS1_I,
 162                 .reg_offset = 1,
 163         },
 164         [TPS65218_LS2_I_IRQ] = {
 165                 .mask = TPS65218_INT2_LS2_I,
 166                 .reg_offset = 1,
 167         },
 168         [TPS65218_LS3_I_IRQ] = {
 169                 .mask = TPS65218_INT2_LS3_I,
 170                 .reg_offset = 1,
 171         },
 172         [TPS65218_LS1_F_IRQ] = {
 173                 .mask = TPS65218_INT2_LS1_F,
 174                 .reg_offset = 1,
 175         },
 176         [TPS65218_LS2_F_IRQ] = {
 177                 .mask = TPS65218_INT2_LS2_F,
 178                 .reg_offset = 1,
 179         },
 180         [TPS65218_LS3_F_IRQ] = {
 181                 .mask = TPS65218_INT2_LS3_F,
 182                 .reg_offset = 1,
 183         },
 184         [TPS65218_INVALID3_IRQ] = {
 185         },
 186         [TPS65218_INVALID4_IRQ] = {
 187         },
 188 };
 189
 190 static struct regmap_irq_chip tps65218_irq_chip = {
 191         .name = "tps65218",
 192         .irqs = tps65218_irqs,
 193         .num_irqs = ARRAY_SIZE(tps65218_irqs),
 194
 195         .num_regs = 2,
 196         .mask_base = TPS65218_REG_INT_MASK1,
 197         .status_base = TPS65218_REG_INT1,
 198 };
 199
 200 static const struct of_device_id of_tps65218_match_table[] = {
 201         { .compatible = "ti,tps65218", },
 202         {}
 203 };
 204 MODULE_DEVICE_TABLE(of, of_tps65218_match_table);
 205
 206 static int tps65218_voltage_set_strict(struct tps65218 *tps)
 207 {
 208         u32 strict;
 209
 210         if (of_property_read_u32(tps->dev->of_node,
 211                                  "ti,strict-supply-voltage-supervision",
 212                                  &strict))
 213                 return 0;
 214
 215         if (strict != 0 && strict != 1) {
 216                 dev_err(tps->dev,
 217                         "Invalid ti,strict-supply-voltage-supervision value\n");
 218                 return -EINVAL;
 219         }
 220
 221         tps65218_update_bits(tps, TPS65218_REG_CONFIG1,
 222                              TPS65218_CONFIG1_STRICT,
 223                              strict ? TPS65218_CONFIG1_STRICT : 0,
 224                              TPS65218_PROTECT_L1);
 225         return 0;
 226 }
 227
 228 static int tps65218_voltage_set_uv_hyst(struct tps65218 *tps)
 229 {
 230         u32 hyst;
 231
 232         if (of_property_read_u32(tps->dev->of_node,
 233                                  "ti,under-voltage-hyst-microvolt", &hyst))
 234                 return 0;
 235
 236         if (hyst != 400000 && hyst != 200000) {
 237                 dev_err(tps->dev,
 238                         "Invalid ti,under-voltage-hyst-microvolt value\n");
 239                 return -EINVAL;
 240         }
 241
 242         tps65218_update_bits(tps, TPS65218_REG_CONFIG2,
 243                              TPS65218_CONFIG2_UVLOHYS,
 244                              hyst == 400000 ? TPS65218_CONFIG2_UVLOHYS : 0,
 245                              TPS65218_PROTECT_L1);
 246         return 0;
 247 }
 248
 249 static int tps65218_voltage_set_uvlo(struct tps65218 *tps)
 250 {
 251         u32 uvlo;
 252         int uvloval;
 253
 254         if (of_property_read_u32(tps->dev->of_node,
 255                                  "ti,under-voltage-limit-microvolt", &uvlo))
 256                 return 0;
 257
 258         switch (uvlo) {
 259         case 2750000:
 260                 uvloval = TPS65218_CONFIG1_UVLO_2750000;
 261                 break;
 262         case 2950000:
 263                 uvloval = TPS65218_CONFIG1_UVLO_2950000;
 264                 break;
 265         case 3250000:
 266                 uvloval = TPS65218_CONFIG1_UVLO_3250000;
 267                 break;
 268         case 3350000:
 269                 uvloval = TPS65218_CONFIG1_UVLO_3350000;
 270                 break;
 271         default:
 272                 dev_err(tps->dev,
 273                         "Invalid ti,under-voltage-limit-microvolt value\n");
 274                 return -EINVAL;
 275         }
 276
 277         tps65218_update_bits(tps, TPS65218_REG_CONFIG1,
 278                              TPS65218_CONFIG1_UVLO_MASK, uvloval,
 279                              TPS65218_PROTECT_L1);
 280         return 0;
 281 }
 282
 283 static int tps65218_probe(struct i2c_client *client)
 284 {
 285         struct tps65218 *tps;
 286         int ret;
 287         unsigned int chipid;
 288
 289         tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
 290         if (!tps)
 291                 return -ENOMEM;
 292
 293         i2c_set_clientdata(client, tps);
 294         tps->dev = &client->dev;
 295         tps->irq = client->irq;
 296         tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config);
 297         if (IS_ERR(tps->regmap)) {
 298                 ret = PTR_ERR(tps->regmap);
 299                 dev_err(tps->dev, "Failed to allocate register map: %d\n",
 300                         ret);
 301                 return ret;
 302         }
 303
 304         mutex_init(&tps->tps_lock);
 305
 306         ret = devm_regmap_add_irq_chip(&client->dev, tps->regmap, tps->irq,
 307                                        IRQF_ONESHOT, 0, &tps65218_irq_chip,
 308                                        &tps->irq_data);
 309         if (ret < 0)
 310                 return ret;
 311
 312         ret = regmap_read(tps->regmap, TPS65218_REG_CHIPID, &chipid);
 313         if (ret) {
 314                 dev_err(tps->dev, "Failed to read chipid: %d\n", ret);
 315                 return ret;
 316         }
 317
 318         tps->rev = chipid & TPS65218_CHIPID_REV_MASK;
 319
 320         ret = tps65218_voltage_set_strict(tps);
 321         if (ret)
 322                 return ret;
 323
 324         ret = tps65218_voltage_set_uvlo(tps);
 325         if (ret)
 326                 return ret;
 327
 328         ret = tps65218_voltage_set_uv_hyst(tps);
 329         if (ret)
 330                 return ret;
 331
 332         ret = mfd_add_devices(tps->dev, PLATFORM_DEVID_AUTO, tps65218_cells,
 333                               ARRAY_SIZE(tps65218_cells), NULL, 0,
 334                               regmap_irq_get_domain(tps->irq_data));
 335
 336         return ret;
 337 }
 338
 339 static const struct i2c_device_id tps65218_id_table[] = {
 340         { "tps65218", TPS65218 },
 341         { },
 342 };
 343 MODULE_DEVICE_TABLE(i2c, tps65218_id_table);
 344
 345 static struct i2c_driver tps65218_driver = {
 346         .driver         = {
 347                 .name   = "tps65218",
 348                 .of_match_table = of_tps65218_match_table,
 349         },
 350         .probe          = tps65218_probe,
 351         .id_table       = tps65218_id_table,
 352 };
 353
 354 module_i2c_driver(tps65218_driver);
 355
 356 MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
 357 MODULE_DESCRIPTION("TPS65218 chip family multi-function driver");
 358 MODULE_LICENSE("GPL v2");