drivers/mfd/as3722.c

   1 /*
   2  * Core driver for ams AS3722 PMICs
   3  *
   4  * Copyright (C) 2013 AMS AG
   5  * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
   6  *
   7  * Author: Florian Lobmaier <florian.lobmaier@ams.com>
   8  * Author: Laxman Dewangan <ldewangan@nvidia.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  23  */
  24
  25 #include <linux/err.h>
  26 #include <linux/i2c.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/irq.h>
  29 #include <linux/kernel.h>
  30 #include <linux/module.h>
  31 #include <linux/mfd/core.h>
  32 #include <linux/mfd/as3722.h>
  33 #include <linux/of.h>
  34 #include <linux/regmap.h>
  35 #include <linux/slab.h>
  36
  37 #define AS3722_DEVICE_ID        0x0C
  38
  39 static const struct resource as3722_rtc_resource[] = {
  40         {
  41                 .name = "as3722-rtc-alarm",
  42                 .start = AS3722_IRQ_RTC_ALARM,
  43                 .end = AS3722_IRQ_RTC_ALARM,
  44                 .flags = IORESOURCE_IRQ,
  45         },
  46 };
  47
  48 static const struct resource as3722_adc_resource[] = {
  49         {
  50                 .name = "as3722-adc",
  51                 .start = AS3722_IRQ_ADC,
  52                 .end = AS3722_IRQ_ADC,
  53                 .flags = IORESOURCE_IRQ,
  54         },
  55 };
  56
  57 static const struct mfd_cell as3722_devs[] = {
  58         {
  59                 .name = "as3722-pinctrl",
  60         },
  61         {
  62                 .name = "as3722-regulator",
  63         },
  64         {
  65                 .name = "as3722-rtc",
  66                 .num_resources = ARRAY_SIZE(as3722_rtc_resource),
  67                 .resources = as3722_rtc_resource,
  68         },
  69         {
  70                 .name = "as3722-adc",
  71                 .num_resources = ARRAY_SIZE(as3722_adc_resource),
  72                 .resources = as3722_adc_resource,
  73         },
  74         {
  75                 .name = "as3722-power-off",
  76         },
  77         {
  78                 .name = "as3722-wdt",
  79         },
  80 };
  81
  82 static const struct regmap_irq as3722_irqs[] = {
  83         /* INT1 IRQs */
  84         [AS3722_IRQ_LID] = {
  85                 .mask = AS3722_INTERRUPT_MASK1_LID,
  86         },
  87         [AS3722_IRQ_ACOK] = {
  88                 .mask = AS3722_INTERRUPT_MASK1_ACOK,
  89         },
  90         [AS3722_IRQ_ENABLE1] = {
  91                 .mask = AS3722_INTERRUPT_MASK1_ENABLE1,
  92         },
  93         [AS3722_IRQ_OCCUR_ALARM_SD0] = {
  94                 .mask = AS3722_INTERRUPT_MASK1_OCURR_ALARM_SD0,
  95         },
  96         [AS3722_IRQ_ONKEY_LONG_PRESS] = {
  97                 .mask = AS3722_INTERRUPT_MASK1_ONKEY_LONG,
  98         },
  99         [AS3722_IRQ_ONKEY] = {
 100                 .mask = AS3722_INTERRUPT_MASK1_ONKEY,
 101         },
 102         [AS3722_IRQ_OVTMP] = {
 103                 .mask = AS3722_INTERRUPT_MASK1_OVTMP,
 104         },
 105         [AS3722_IRQ_LOWBAT] = {
 106                 .mask = AS3722_INTERRUPT_MASK1_LOWBAT,
 107         },
 108
 109         /* INT2 IRQs */
 110         [AS3722_IRQ_SD0_LV] = {
 111                 .mask = AS3722_INTERRUPT_MASK2_SD0_LV,
 112                 .reg_offset = 1,
 113         },
 114         [AS3722_IRQ_SD1_LV] = {
 115                 .mask = AS3722_INTERRUPT_MASK2_SD1_LV,
 116                 .reg_offset = 1,
 117         },
 118         [AS3722_IRQ_SD2_LV] = {
 119                 .mask = AS3722_INTERRUPT_MASK2_SD2345_LV,
 120                 .reg_offset = 1,
 121         },
 122         [AS3722_IRQ_PWM1_OV_PROT] = {
 123                 .mask = AS3722_INTERRUPT_MASK2_PWM1_OV_PROT,
 124                 .reg_offset = 1,
 125         },
 126         [AS3722_IRQ_PWM2_OV_PROT] = {
 127                 .mask = AS3722_INTERRUPT_MASK2_PWM2_OV_PROT,
 128                 .reg_offset = 1,
 129         },
 130         [AS3722_IRQ_ENABLE2] = {
 131                 .mask = AS3722_INTERRUPT_MASK2_ENABLE2,
 132                 .reg_offset = 1,
 133         },
 134         [AS3722_IRQ_SD6_LV] = {
 135                 .mask = AS3722_INTERRUPT_MASK2_SD6_LV,
 136                 .reg_offset = 1,
 137         },
 138         [AS3722_IRQ_RTC_REP] = {
 139                 .mask = AS3722_INTERRUPT_MASK2_RTC_REP,
 140                 .reg_offset = 1,
 141         },
 142
 143         /* INT3 IRQs */
 144         [AS3722_IRQ_RTC_ALARM] = {
 145                 .mask = AS3722_INTERRUPT_MASK3_RTC_ALARM,
 146                 .reg_offset = 2,
 147         },
 148         [AS3722_IRQ_GPIO1] = {
 149                 .mask = AS3722_INTERRUPT_MASK3_GPIO1,
 150                 .reg_offset = 2,
 151         },
 152         [AS3722_IRQ_GPIO2] = {
 153                 .mask = AS3722_INTERRUPT_MASK3_GPIO2,
 154                 .reg_offset = 2,
 155         },
 156         [AS3722_IRQ_GPIO3] = {
 157                 .mask = AS3722_INTERRUPT_MASK3_GPIO3,
 158                 .reg_offset = 2,
 159         },
 160         [AS3722_IRQ_GPIO4] = {
 161                 .mask = AS3722_INTERRUPT_MASK3_GPIO4,
 162                 .reg_offset = 2,
 163         },
 164         [AS3722_IRQ_GPIO5] = {
 165                 .mask = AS3722_INTERRUPT_MASK3_GPIO5,
 166                 .reg_offset = 2,
 167         },
 168         [AS3722_IRQ_WATCHDOG] = {
 169                 .mask = AS3722_INTERRUPT_MASK3_WATCHDOG,
 170                 .reg_offset = 2,
 171         },
 172         [AS3722_IRQ_ENABLE3] = {
 173                 .mask = AS3722_INTERRUPT_MASK3_ENABLE3,
 174                 .reg_offset = 2,
 175         },
 176
 177         /* INT4 IRQs */
 178         [AS3722_IRQ_TEMP_SD0_SHUTDOWN] = {
 179                 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD0_SHUTDOWN,
 180                 .reg_offset = 3,
 181         },
 182         [AS3722_IRQ_TEMP_SD1_SHUTDOWN] = {
 183                 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD1_SHUTDOWN,
 184                 .reg_offset = 3,
 185         },
 186         [AS3722_IRQ_TEMP_SD2_SHUTDOWN] = {
 187                 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD6_SHUTDOWN,
 188                 .reg_offset = 3,
 189         },
 190         [AS3722_IRQ_TEMP_SD0_ALARM] = {
 191                 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD0_ALARM,
 192                 .reg_offset = 3,
 193         },
 194         [AS3722_IRQ_TEMP_SD1_ALARM] = {
 195                 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD1_ALARM,
 196                 .reg_offset = 3,
 197         },
 198         [AS3722_IRQ_TEMP_SD6_ALARM] = {
 199                 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD6_ALARM,
 200                 .reg_offset = 3,
 201         },
 202         [AS3722_IRQ_OCCUR_ALARM_SD6] = {
 203                 .mask = AS3722_INTERRUPT_MASK4_OCCUR_ALARM_SD6,
 204                 .reg_offset = 3,
 205         },
 206         [AS3722_IRQ_ADC] = {
 207                 .mask = AS3722_INTERRUPT_MASK4_ADC,
 208                 .reg_offset = 3,
 209         },
 210 };
 211
 212 static const struct regmap_irq_chip as3722_irq_chip = {
 213         .name = "as3722",
 214         .irqs = as3722_irqs,
 215         .num_irqs = ARRAY_SIZE(as3722_irqs),
 216         .num_regs = 4,
 217         .status_base = AS3722_INTERRUPT_STATUS1_REG,
 218         .mask_base = AS3722_INTERRUPT_MASK1_REG,
 219 };
 220
 221 static int as3722_check_device_id(struct as3722 *as3722)
 222 {
 223         u32 val;
 224         int ret;
 225
 226         /* Check that this is actually a AS3722 */
 227         ret = as3722_read(as3722, AS3722_ASIC_ID1_REG, &val);
 228         if (ret < 0) {
 229                 dev_err(as3722->dev, "ASIC_ID1 read failed: %d\n", ret);
 230                 return ret;
 231         }
 232
 233         if (val != AS3722_DEVICE_ID) {
 234                 dev_err(as3722->dev, "Device is not AS3722, ID is 0x%x\n", val);
 235                 return -ENODEV;
 236         }
 237
 238         ret = as3722_read(as3722, AS3722_ASIC_ID2_REG, &val);
 239         if (ret < 0) {
 240                 dev_err(as3722->dev, "ASIC_ID2 read failed: %d\n", ret);
 241                 return ret;
 242         }
 243
 244         dev_info(as3722->dev, "AS3722 with revision 0x%x found\n", val);
 245         return 0;
 246 }
 247
 248 static int as3722_configure_pullups(struct as3722 *as3722)
 249 {
 250         int ret;
 251         u32 val = 0;
 252
 253         if (as3722->en_intern_int_pullup)
 254                 val |= AS3722_INT_PULL_UP;
 255         if (as3722->en_intern_i2c_pullup)
 256                 val |= AS3722_I2C_PULL_UP;
 257
 258         ret = as3722_update_bits(as3722, AS3722_IOVOLTAGE_REG,
 259                         AS3722_INT_PULL_UP | AS3722_I2C_PULL_UP, val);
 260         if (ret < 0)
 261                 dev_err(as3722->dev, "IOVOLTAGE_REG update failed: %d\n", ret);
 262         return ret;
 263 }
 264
 265 static const struct regmap_range as3722_readable_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_REG_SEQU_MOD3_REG),
 269         regmap_reg_range(AS3722_SD_PHSW_CTRL_REG, AS3722_PWM_CONTROL_H_REG),
 270         regmap_reg_range(AS3722_WATCHDOG_TIMER_REG, AS3722_WATCHDOG_TIMER_REG),
 271         regmap_reg_range(AS3722_WATCHDOG_SOFTWARE_SIGNAL_REG,
 272                                         AS3722_BATTERY_VOLTAGE_MONITOR2_REG),
 273         regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_PWM_VCONTROL4_REG),
 274         regmap_reg_range(AS3722_BB_CHARGER_REG, AS3722_SRAM_REG),
 275         regmap_reg_range(AS3722_RTC_ACCESS_REG, AS3722_RTC_ACCESS_REG),
 276         regmap_reg_range(AS3722_RTC_STATUS_REG, AS3722_TEMP_STATUS_REG),
 277         regmap_reg_range(AS3722_ADC0_CONTROL_REG, AS3722_ADC_CONFIGURATION_REG),
 278         regmap_reg_range(AS3722_ASIC_ID1_REG, AS3722_ASIC_ID2_REG),
 279         regmap_reg_range(AS3722_LOCK_REG, AS3722_LOCK_REG),
 280 };
 281
 282 static const struct regmap_access_table as3722_readable_table = {
 283         .yes_ranges = as3722_readable_ranges,
 284         .n_yes_ranges = ARRAY_SIZE(as3722_readable_ranges),
 285 };
 286
 287 static const struct regmap_range as3722_writable_ranges[] = {
 288         regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_SD6_VOLTAGE_REG),
 289         regmap_reg_range(AS3722_GPIO0_CONTROL_REG, AS3722_LDO7_VOLTAGE_REG),
 290         regmap_reg_range(AS3722_LDO9_VOLTAGE_REG, AS3722_GPIO_SIGNAL_OUT_REG),
 291         regmap_reg_range(AS3722_REG_SEQU_MOD1_REG, AS3722_REG_SEQU_MOD3_REG),
 292         regmap_reg_range(AS3722_SD_PHSW_CTRL_REG, AS3722_PWM_CONTROL_H_REG),
 293         regmap_reg_range(AS3722_WATCHDOG_TIMER_REG, AS3722_WATCHDOG_TIMER_REG),
 294         regmap_reg_range(AS3722_WATCHDOG_SOFTWARE_SIGNAL_REG,
 295                                         AS3722_BATTERY_VOLTAGE_MONITOR2_REG),
 296         regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_PWM_VCONTROL4_REG),
 297         regmap_reg_range(AS3722_BB_CHARGER_REG, AS3722_SRAM_REG),
 298         regmap_reg_range(AS3722_INTERRUPT_MASK1_REG, AS3722_TEMP_STATUS_REG),
 299         regmap_reg_range(AS3722_ADC0_CONTROL_REG, AS3722_ADC1_CONTROL_REG),
 300         regmap_reg_range(AS3722_ADC1_THRESHOLD_HI_MSB_REG,
 301                                         AS3722_ADC_CONFIGURATION_REG),
 302         regmap_reg_range(AS3722_LOCK_REG, AS3722_LOCK_REG),
 303 };
 304
 305 static const struct regmap_access_table as3722_writable_table = {
 306         .yes_ranges = as3722_writable_ranges,
 307         .n_yes_ranges = ARRAY_SIZE(as3722_writable_ranges),
 308 };
 309
 310 static const struct regmap_range as3722_cacheable_ranges[] = {
 311         regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_LDO11_VOLTAGE_REG),
 312         regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_LDOCONTROL1_REG),
 313 };
 314
 315 static const struct regmap_access_table as3722_volatile_table = {
 316         .no_ranges = as3722_cacheable_ranges,
 317         .n_no_ranges = ARRAY_SIZE(as3722_cacheable_ranges),
 318 };
 319
 320 static const struct regmap_config as3722_regmap_config = {
 321         .reg_bits = 8,
 322         .val_bits = 8,
 323         .max_register = AS3722_MAX_REGISTER,
 324         .cache_type = REGCACHE_RBTREE,
 325         .rd_table = &as3722_readable_table,
 326         .wr_table = &as3722_writable_table,
 327         .volatile_table = &as3722_volatile_table,
 328 };
 329
 330 static int as3722_i2c_of_probe(struct i2c_client *i2c,
 331                         struct as3722 *as3722)
 332 {
 333         struct device_node *np = i2c->dev.of_node;
 334         struct irq_data *irq_data;
 335
 336         if (!np) {
 337                 dev_err(&i2c->dev, "Device Tree not found\n");
 338                 return -EINVAL;
 339         }
 340
 341         irq_data = irq_get_irq_data(i2c->irq);
 342         if (!irq_data) {
 343                 dev_err(&i2c->dev, "Invalid IRQ: %d\n", i2c->irq);
 344                 return -EINVAL;
 345         }
 346
 347         as3722->en_intern_int_pullup = of_property_read_bool(np,
 348                                         "ams,enable-internal-int-pullup");
 349         as3722->en_intern_i2c_pullup = of_property_read_bool(np,
 350                                         "ams,enable-internal-i2c-pullup");
 351         as3722->irq_flags = irqd_get_trigger_type(irq_data);
 352         dev_dbg(&i2c->dev, "IRQ flags are 0x%08lx\n", as3722->irq_flags);
 353         return 0;
 354 }
 355
 356 static int as3722_i2c_probe(struct i2c_client *i2c,
 357                         const struct i2c_device_id *id)
 358 {
 359         struct as3722 *as3722;
 360         unsigned long irq_flags;
 361         int ret;
 362
 363         as3722 = devm_kzalloc(&i2c->dev, sizeof(struct as3722), GFP_KERNEL);
 364         if (!as3722)
 365                 return -ENOMEM;
 366
 367         as3722->dev = &i2c->dev;
 368         as3722->chip_irq = i2c->irq;
 369         i2c_set_clientdata(i2c, as3722);
 370
 371         ret = as3722_i2c_of_probe(i2c, as3722);
 372         if (ret < 0)
 373                 return ret;
 374
 375         as3722->regmap = devm_regmap_init_i2c(i2c, &as3722_regmap_config);
 376         if (IS_ERR(as3722->regmap)) {
 377                 ret = PTR_ERR(as3722->regmap);
 378                 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
 379                 return ret;
 380         }
 381
 382         ret = as3722_check_device_id(as3722);
 383         if (ret < 0)
 384                 return ret;
 385
 386         irq_flags = as3722->irq_flags | IRQF_ONESHOT;
 387         ret = regmap_add_irq_chip(as3722->regmap, as3722->chip_irq,
 388                         irq_flags, -1, &as3722_irq_chip,
 389                         &as3722->irq_data);
 390         if (ret < 0) {
 391                 dev_err(as3722->dev, "Failed to add regmap irq: %d\n", ret);
 392                 return ret;
 393         }
 394
 395         ret = as3722_configure_pullups(as3722);
 396         if (ret < 0)
 397                 goto scrub;
 398
 399         ret = mfd_add_devices(&i2c->dev, -1, as3722_devs,
 400                         ARRAY_SIZE(as3722_devs), NULL, 0,
 401                         regmap_irq_get_domain(as3722->irq_data));
 402         if (ret) {
 403                 dev_err(as3722->dev, "Failed to add MFD devices: %d\n", ret);
 404                 goto scrub;
 405         }
 406
 407         dev_dbg(as3722->dev, "AS3722 core driver initialized successfully\n");
 408         return 0;
 409
 410 scrub:
 411         regmap_del_irq_chip(as3722->chip_irq, as3722->irq_data);
 412         return ret;
 413 }
 414
 415 static int as3722_i2c_remove(struct i2c_client *i2c)
 416 {
 417         struct as3722 *as3722 = i2c_get_clientdata(i2c);
 418
 419         mfd_remove_devices(as3722->dev);
 420         regmap_del_irq_chip(as3722->chip_irq, as3722->irq_data);
 421         return 0;
 422 }
 423
 424 static const struct of_device_id as3722_of_match[] = {
 425         { .compatible = "ams,as3722", },
 426         {},
 427 };
 428 MODULE_DEVICE_TABLE(of, as3722_of_match);
 429
 430 static const struct i2c_device_id as3722_i2c_id[] = {
 431         { "as3722", 0 },
 432         {},
 433 };
 434 MODULE_DEVICE_TABLE(i2c, as3722_i2c_id);
 435
 436 static struct i2c_driver as3722_i2c_driver = {
 437         .driver = {
 438                 .name = "as3722",
 439                 .owner = THIS_MODULE,
 440                 .of_match_table = as3722_of_match,
 441         },
 442         .probe = as3722_i2c_probe,
 443         .remove = as3722_i2c_remove,
 444         .id_table = as3722_i2c_id,
 445 };
 446
 447 module_i2c_driver(as3722_i2c_driver);
 448
 449 MODULE_DESCRIPTION("I2C support for AS3722 PMICs");
 450 MODULE_AUTHOR("Florian Lobmaier <florian.lobmaier@ams.com>");
 451 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 452 MODULE_LICENSE("GPL");