drivers/mfd/as3722.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Core driver for ams AS3722 PMICs
   4  *
   5  * Copyright (C) 2013 AMS AG
   6  * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
   7  *
   8  * Author: Florian Lobmaier <florian.lobmaier@ams.com>
   9  * Author: Laxman Dewangan <ldewangan@nvidia.com>
  10  */
  11
  12 #include <linux/err.h>
  13 #include <linux/i2c.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/irq.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/mfd/core.h>
  19 #include <linux/mfd/as3722.h>
  20 #include <linux/of.h>
  21 #include <linux/regmap.h>
  22 #include <linux/slab.h>
  23
  24 #define AS3722_DEVICE_ID        0x0C
  25
  26 static const struct resource as3722_rtc_resource[] = {
  27         DEFINE_RES_IRQ_NAMED(AS3722_IRQ_RTC_ALARM, "as3722-rtc-alarm"),
  28 };
  29
  30 static const struct resource as3722_adc_resource[] = {
  31         DEFINE_RES_IRQ_NAMED(AS3722_IRQ_ADC, "as3722-adc"),
  32 };
  33
  34 static const struct mfd_cell as3722_devs[] = {
  35         {
  36                 .name = "as3722-pinctrl",
  37         },
  38         {
  39                 .name = "as3722-regulator",
  40         },
  41         {
  42                 .name = "as3722-rtc",
  43                 .num_resources = ARRAY_SIZE(as3722_rtc_resource),
  44                 .resources = as3722_rtc_resource,
  45         },
  46         {
  47                 .name = "as3722-adc",
  48                 .num_resources = ARRAY_SIZE(as3722_adc_resource),
  49                 .resources = as3722_adc_resource,
  50         },
  51         {
  52                 .name = "as3722-power-off",
  53         },
  54         {
  55                 .name = "as3722-wdt",
  56         },
  57 };
  58
  59 static const struct regmap_irq as3722_irqs[] = {
  60         /* INT1 IRQs */
  61         [AS3722_IRQ_LID] = {
  62                 .mask = AS3722_INTERRUPT_MASK1_LID,
  63         },
  64         [AS3722_IRQ_ACOK] = {
  65                 .mask = AS3722_INTERRUPT_MASK1_ACOK,
  66         },
  67         [AS3722_IRQ_ENABLE1] = {
  68                 .mask = AS3722_INTERRUPT_MASK1_ENABLE1,
  69         },
  70         [AS3722_IRQ_OCCUR_ALARM_SD0] = {
  71                 .mask = AS3722_INTERRUPT_MASK1_OCURR_ALARM_SD0,
  72         },
  73         [AS3722_IRQ_ONKEY_LONG_PRESS] = {
  74                 .mask = AS3722_INTERRUPT_MASK1_ONKEY_LONG,
  75         },
  76         [AS3722_IRQ_ONKEY] = {
  77                 .mask = AS3722_INTERRUPT_MASK1_ONKEY,
  78         },
  79         [AS3722_IRQ_OVTMP] = {
  80                 .mask = AS3722_INTERRUPT_MASK1_OVTMP,
  81         },
  82         [AS3722_IRQ_LOWBAT] = {
  83                 .mask = AS3722_INTERRUPT_MASK1_LOWBAT,
  84         },
  85
  86         /* INT2 IRQs */
  87         [AS3722_IRQ_SD0_LV] = {
  88                 .mask = AS3722_INTERRUPT_MASK2_SD0_LV,
  89                 .reg_offset = 1,
  90         },
  91         [AS3722_IRQ_SD1_LV] = {
  92                 .mask = AS3722_INTERRUPT_MASK2_SD1_LV,
  93                 .reg_offset = 1,
  94         },
  95         [AS3722_IRQ_SD2_LV] = {
  96                 .mask = AS3722_INTERRUPT_MASK2_SD2345_LV,
  97                 .reg_offset = 1,
  98         },
  99         [AS3722_IRQ_PWM1_OV_PROT] = {
 100                 .mask = AS3722_INTERRUPT_MASK2_PWM1_OV_PROT,
 101                 .reg_offset = 1,
 102         },
 103         [AS3722_IRQ_PWM2_OV_PROT] = {
 104                 .mask = AS3722_INTERRUPT_MASK2_PWM2_OV_PROT,
 105                 .reg_offset = 1,
 106         },
 107         [AS3722_IRQ_ENABLE2] = {
 108                 .mask = AS3722_INTERRUPT_MASK2_ENABLE2,
 109                 .reg_offset = 1,
 110         },
 111         [AS3722_IRQ_SD6_LV] = {
 112                 .mask = AS3722_INTERRUPT_MASK2_SD6_LV,
 113                 .reg_offset = 1,
 114         },
 115         [AS3722_IRQ_RTC_REP] = {
 116                 .mask = AS3722_INTERRUPT_MASK2_RTC_REP,
 117                 .reg_offset = 1,
 118         },
 119
 120         /* INT3 IRQs */
 121         [AS3722_IRQ_RTC_ALARM] = {
 122                 .mask = AS3722_INTERRUPT_MASK3_RTC_ALARM,
 123                 .reg_offset = 2,
 124         },
 125         [AS3722_IRQ_GPIO1] = {
 126                 .mask = AS3722_INTERRUPT_MASK3_GPIO1,
 127                 .reg_offset = 2,
 128         },
 129         [AS3722_IRQ_GPIO2] = {
 130                 .mask = AS3722_INTERRUPT_MASK3_GPIO2,
 131                 .reg_offset = 2,
 132         },
 133         [AS3722_IRQ_GPIO3] = {
 134                 .mask = AS3722_INTERRUPT_MASK3_GPIO3,
 135                 .reg_offset = 2,
 136         },
 137         [AS3722_IRQ_GPIO4] = {
 138                 .mask = AS3722_INTERRUPT_MASK3_GPIO4,
 139                 .reg_offset = 2,
 140         },
 141         [AS3722_IRQ_GPIO5] = {
 142                 .mask = AS3722_INTERRUPT_MASK3_GPIO5,
 143                 .reg_offset = 2,
 144         },
 145         [AS3722_IRQ_WATCHDOG] = {
 146                 .mask = AS3722_INTERRUPT_MASK3_WATCHDOG,
 147                 .reg_offset = 2,
 148         },
 149         [AS3722_IRQ_ENABLE3] = {
 150                 .mask = AS3722_INTERRUPT_MASK3_ENABLE3,
 151                 .reg_offset = 2,
 152         },
 153
 154         /* INT4 IRQs */
 155         [AS3722_IRQ_TEMP_SD0_SHUTDOWN] = {
 156                 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD0_SHUTDOWN,
 157                 .reg_offset = 3,
 158         },
 159         [AS3722_IRQ_TEMP_SD1_SHUTDOWN] = {
 160                 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD1_SHUTDOWN,
 161                 .reg_offset = 3,
 162         },
 163         [AS3722_IRQ_TEMP_SD2_SHUTDOWN] = {
 164                 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD6_SHUTDOWN,
 165                 .reg_offset = 3,
 166         },
 167         [AS3722_IRQ_TEMP_SD0_ALARM] = {
 168                 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD0_ALARM,
 169                 .reg_offset = 3,
 170         },
 171         [AS3722_IRQ_TEMP_SD1_ALARM] = {
 172                 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD1_ALARM,
 173                 .reg_offset = 3,
 174         },
 175         [AS3722_IRQ_TEMP_SD6_ALARM] = {
 176                 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD6_ALARM,
 177                 .reg_offset = 3,
 178         },
 179         [AS3722_IRQ_OCCUR_ALARM_SD6] = {
 180                 .mask = AS3722_INTERRUPT_MASK4_OCCUR_ALARM_SD6,
 181                 .reg_offset = 3,
 182         },
 183         [AS3722_IRQ_ADC] = {
 184                 .mask = AS3722_INTERRUPT_MASK4_ADC,
 185                 .reg_offset = 3,
 186         },
 187 };
 188
 189 static const struct regmap_irq_chip as3722_irq_chip = {
 190         .name = "as3722",
 191         .irqs = as3722_irqs,
 192         .num_irqs = ARRAY_SIZE(as3722_irqs),
 193         .num_regs = 4,
 194         .status_base = AS3722_INTERRUPT_STATUS1_REG,
 195         .mask_base = AS3722_INTERRUPT_MASK1_REG,
 196 };
 197
 198 static int as3722_check_device_id(struct as3722 *as3722)
 199 {
 200         u32 val;
 201         int ret;
 202
 203         /* Check that this is actually a AS3722 */
 204         ret = as3722_read(as3722, AS3722_ASIC_ID1_REG, &val);
 205         if (ret < 0) {
 206                 dev_err(as3722->dev, "ASIC_ID1 read failed: %d\n", ret);
 207                 return ret;
 208         }
 209
 210         if (val != AS3722_DEVICE_ID) {
 211                 dev_err(as3722->dev, "Device is not AS3722, ID is 0x%x\n", val);
 212                 return -ENODEV;
 213         }
 214
 215         ret = as3722_read(as3722, AS3722_ASIC_ID2_REG, &val);
 216         if (ret < 0) {
 217                 dev_err(as3722->dev, "ASIC_ID2 read failed: %d\n", ret);
 218                 return ret;
 219         }
 220
 221         dev_info(as3722->dev, "AS3722 with revision 0x%x found\n", val);
 222         return 0;
 223 }
 224
 225 static int as3722_configure_pullups(struct as3722 *as3722)
 226 {
 227         int ret;
 228         u32 val = 0;
 229
 230         if (as3722->en_intern_int_pullup)
 231                 val |= AS3722_INT_PULL_UP;
 232         if (as3722->en_intern_i2c_pullup)
 233                 val |= AS3722_I2C_PULL_UP;
 234
 235         ret = as3722_update_bits(as3722, AS3722_IOVOLTAGE_REG,
 236                         AS3722_INT_PULL_UP | AS3722_I2C_PULL_UP, val);
 237         if (ret < 0)
 238                 dev_err(as3722->dev, "IOVOLTAGE_REG update failed: %d\n", ret);
 239         return ret;
 240 }
 241
 242 static const struct regmap_range as3722_readable_ranges[] = {
 243         regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_SD6_VOLTAGE_REG),
 244         regmap_reg_range(AS3722_GPIO0_CONTROL_REG, AS3722_LDO7_VOLTAGE_REG),
 245         regmap_reg_range(AS3722_LDO9_VOLTAGE_REG, AS3722_REG_SEQU_MOD3_REG),
 246         regmap_reg_range(AS3722_SD_PHSW_CTRL_REG, AS3722_PWM_CONTROL_H_REG),
 247         regmap_reg_range(AS3722_WATCHDOG_TIMER_REG, AS3722_WATCHDOG_TIMER_REG),
 248         regmap_reg_range(AS3722_WATCHDOG_SOFTWARE_SIGNAL_REG,
 249                                         AS3722_BATTERY_VOLTAGE_MONITOR2_REG),
 250         regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_PWM_VCONTROL4_REG),
 251         regmap_reg_range(AS3722_BB_CHARGER_REG, AS3722_SRAM_REG),
 252         regmap_reg_range(AS3722_RTC_ACCESS_REG, AS3722_RTC_ACCESS_REG),
 253         regmap_reg_range(AS3722_RTC_STATUS_REG, AS3722_TEMP_STATUS_REG),
 254         regmap_reg_range(AS3722_ADC0_CONTROL_REG, AS3722_ADC_CONFIGURATION_REG),
 255         regmap_reg_range(AS3722_ASIC_ID1_REG, AS3722_ASIC_ID2_REG),
 256         regmap_reg_range(AS3722_LOCK_REG, AS3722_LOCK_REG),
 257         regmap_reg_range(AS3722_FUSE7_REG, AS3722_FUSE7_REG),
 258 };
 259
 260 static const struct regmap_access_table as3722_readable_table = {
 261         .yes_ranges = as3722_readable_ranges,
 262         .n_yes_ranges = ARRAY_SIZE(as3722_readable_ranges),
 263 };
 264
 265 static const struct regmap_range as3722_writable_ranges[] = {
 266         regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_SD6_VOLTAGE_REG),
 267         regmap_reg_range(AS3722_GPIO0_CONTROL_REG, AS3722_LDO7_VOLTAGE_REG),
 268         regmap_reg_range(AS3722_LDO9_VOLTAGE_REG, AS3722_GPIO_SIGNAL_OUT_REG),
 269         regmap_reg_range(AS3722_REG_SEQU_MOD1_REG, AS3722_REG_SEQU_MOD3_REG),
 270         regmap_reg_range(AS3722_SD_PHSW_CTRL_REG, AS3722_PWM_CONTROL_H_REG),
 271         regmap_reg_range(AS3722_WATCHDOG_TIMER_REG, AS3722_WATCHDOG_TIMER_REG),
 272         regmap_reg_range(AS3722_WATCHDOG_SOFTWARE_SIGNAL_REG,
 273                                         AS3722_BATTERY_VOLTAGE_MONITOR2_REG),
 274         regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_PWM_VCONTROL4_REG),
 275         regmap_reg_range(AS3722_BB_CHARGER_REG, AS3722_SRAM_REG),
 276         regmap_reg_range(AS3722_INTERRUPT_MASK1_REG, AS3722_TEMP_STATUS_REG),
 277         regmap_reg_range(AS3722_ADC0_CONTROL_REG, AS3722_ADC1_CONTROL_REG),
 278         regmap_reg_range(AS3722_ADC1_THRESHOLD_HI_MSB_REG,
 279                                         AS3722_ADC_CONFIGURATION_REG),
 280         regmap_reg_range(AS3722_LOCK_REG, AS3722_LOCK_REG),
 281 };
 282
 283 static const struct regmap_access_table as3722_writable_table = {
 284         .yes_ranges = as3722_writable_ranges,
 285         .n_yes_ranges = ARRAY_SIZE(as3722_writable_ranges),
 286 };
 287
 288 static const struct regmap_range as3722_cacheable_ranges[] = {
 289         regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_LDO11_VOLTAGE_REG),
 290         regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_LDOCONTROL1_REG),
 291 };
 292
 293 static const struct regmap_access_table as3722_volatile_table = {
 294         .no_ranges = as3722_cacheable_ranges,
 295         .n_no_ranges = ARRAY_SIZE(as3722_cacheable_ranges),
 296 };
 297
 298 static const struct regmap_config as3722_regmap_config = {
 299         .reg_bits = 8,
 300         .val_bits = 8,
 301         .max_register = AS3722_MAX_REGISTER,
 302         .cache_type = REGCACHE_RBTREE,
 303         .rd_table = &as3722_readable_table,
 304         .wr_table = &as3722_writable_table,
 305         .volatile_table = &as3722_volatile_table,
 306 };
 307
 308 static int as3722_i2c_of_probe(struct i2c_client *i2c,
 309                         struct as3722 *as3722)
 310 {
 311         struct device_node *np = i2c->dev.of_node;
 312         struct irq_data *irq_data;
 313
 314         if (!np) {
 315                 dev_err(&i2c->dev, "Device Tree not found\n");
 316                 return -EINVAL;
 317         }
 318
 319         irq_data = irq_get_irq_data(i2c->irq);
 320         if (!irq_data) {
 321                 dev_err(&i2c->dev, "Invalid IRQ: %d\n", i2c->irq);
 322                 return -EINVAL;
 323         }
 324
 325         as3722->en_intern_int_pullup = of_property_read_bool(np,
 326                                         "ams,enable-internal-int-pullup");
 327         as3722->en_intern_i2c_pullup = of_property_read_bool(np,
 328                                         "ams,enable-internal-i2c-pullup");
 329         as3722->en_ac_ok_pwr_on = of_property_read_bool(np,
 330                                         "ams,enable-ac-ok-power-on");
 331         as3722->irq_flags = irqd_get_trigger_type(irq_data);
 332         dev_dbg(&i2c->dev, "IRQ flags are 0x%08lx\n", as3722->irq_flags);
 333         return 0;
 334 }
 335
 336 static int as3722_i2c_probe(struct i2c_client *i2c,
 337                         const struct i2c_device_id *id)
 338 {
 339         struct as3722 *as3722;
 340         unsigned long irq_flags;
 341         int ret;
 342         u8 val = 0;
 343
 344         as3722 = devm_kzalloc(&i2c->dev, sizeof(struct as3722), GFP_KERNEL);
 345         if (!as3722)
 346                 return -ENOMEM;
 347
 348         as3722->dev = &i2c->dev;
 349         as3722->chip_irq = i2c->irq;
 350         i2c_set_clientdata(i2c, as3722);
 351
 352         ret = as3722_i2c_of_probe(i2c, as3722);
 353         if (ret < 0)
 354                 return ret;
 355
 356         as3722->regmap = devm_regmap_init_i2c(i2c, &as3722_regmap_config);
 357         if (IS_ERR(as3722->regmap)) {
 358                 ret = PTR_ERR(as3722->regmap);
 359                 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
 360                 return ret;
 361         }
 362
 363         ret = as3722_check_device_id(as3722);
 364         if (ret < 0)
 365                 return ret;
 366
 367         irq_flags = as3722->irq_flags | IRQF_ONESHOT;
 368         ret = devm_regmap_add_irq_chip(as3722->dev, as3722->regmap,
 369                                        as3722->chip_irq,
 370                                        irq_flags, -1, &as3722_irq_chip,
 371                                        &as3722->irq_data);
 372         if (ret < 0) {
 373                 dev_err(as3722->dev, "Failed to add regmap irq: %d\n", ret);
 374                 return ret;
 375         }
 376
 377         ret = as3722_configure_pullups(as3722);
 378         if (ret < 0)
 379                 return ret;
 380
 381         if (as3722->en_ac_ok_pwr_on)
 382                 val = AS3722_CTRL_SEQU1_AC_OK_PWR_ON;
 383         ret = as3722_update_bits(as3722, AS3722_CTRL_SEQU1_REG,
 384                         AS3722_CTRL_SEQU1_AC_OK_PWR_ON, val);
 385         if (ret < 0) {
 386                 dev_err(as3722->dev, "CTRLsequ1 update failed: %d\n", ret);
 387                 return ret;
 388         }
 389
 390         ret = devm_mfd_add_devices(&i2c->dev, -1, as3722_devs,
 391                                    ARRAY_SIZE(as3722_devs), NULL, 0,
 392                                    regmap_irq_get_domain(as3722->irq_data));
 393         if (ret) {
 394                 dev_err(as3722->dev, "Failed to add MFD devices: %d\n", ret);
 395                 return ret;
 396         }
 397
 398         device_init_wakeup(as3722->dev, true);
 399
 400         dev_dbg(as3722->dev, "AS3722 core driver initialized successfully\n");
 401         return 0;
 402 }
 403
 404 static int __maybe_unused as3722_i2c_suspend(struct device *dev)
 405 {
 406         struct as3722 *as3722 = dev_get_drvdata(dev);
 407
 408         if (device_may_wakeup(dev))
 409                 enable_irq_wake(as3722->chip_irq);
 410         disable_irq(as3722->chip_irq);
 411
 412         return 0;
 413 }
 414
 415 static int __maybe_unused as3722_i2c_resume(struct device *dev)
 416 {
 417         struct as3722 *as3722 = dev_get_drvdata(dev);
 418
 419         enable_irq(as3722->chip_irq);
 420
 421         if (device_may_wakeup(dev))
 422                 disable_irq_wake(as3722->chip_irq);
 423
 424         return 0;
 425 }
 426
 427 static const struct of_device_id as3722_of_match[] = {
 428         { .compatible = "ams,as3722", },
 429         {},
 430 };
 431 MODULE_DEVICE_TABLE(of, as3722_of_match);
 432
 433 static const struct i2c_device_id as3722_i2c_id[] = {
 434         { "as3722", 0 },
 435         {},
 436 };
 437 MODULE_DEVICE_TABLE(i2c, as3722_i2c_id);
 438
 439 static const struct dev_pm_ops as3722_pm_ops = {
 440         SET_SYSTEM_SLEEP_PM_OPS(as3722_i2c_suspend, as3722_i2c_resume)
 441 };
 442
 443 static struct i2c_driver as3722_i2c_driver = {
 444         .driver = {
 445                 .name = "as3722",
 446                 .of_match_table = as3722_of_match,
 447                 .pm = &as3722_pm_ops,
 448         },
 449         .probe = as3722_i2c_probe,
 450         .id_table = as3722_i2c_id,
 451 };
 452
 453 module_i2c_driver(as3722_i2c_driver);
 454
 455 MODULE_DESCRIPTION("I2C support for AS3722 PMICs");
 456 MODULE_AUTHOR("Florian Lobmaier <florian.lobmaier@ams.com>");
 457 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 458 MODULE_LICENSE("GPL");