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 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
  79 static const struct regmap_irq as3722_irqs[] = {
  80         /* INT1 IRQs */
  81         [AS3722_IRQ_LID] = {
  82                 .mask = AS3722_INTERRUPT_MASK1_LID,
  83         },
  84         [AS3722_IRQ_ACOK] = {
  85                 .mask = AS3722_INTERRUPT_MASK1_ACOK,
  86         },
  87         [AS3722_IRQ_ENABLE1] = {
  88                 .mask = AS3722_INTERRUPT_MASK1_ENABLE1,
  89         },
  90         [AS3722_IRQ_OCCUR_ALARM_SD0] = {
  91                 .mask = AS3722_INTERRUPT_MASK1_OCURR_ALARM_SD0,
  92         },
  93         [AS3722_IRQ_ONKEY_LONG_PRESS] = {
  94                 .mask = AS3722_INTERRUPT_MASK1_ONKEY_LONG,
  95         },
  96         [AS3722_IRQ_ONKEY] = {
  97                 .mask = AS3722_INTERRUPT_MASK1_ONKEY,
  98         },
  99         [AS3722_IRQ_OVTMP] = {
 100                 .mask = AS3722_INTERRUPT_MASK1_OVTMP,
 101         },
 102         [AS3722_IRQ_LOWBAT] = {
 103                 .mask = AS3722_INTERRUPT_MASK1_LOWBAT,
 104         },
 105
 106         /* INT2 IRQs */
 107         [AS3722_IRQ_SD0_LV] = {
 108                 .mask = AS3722_INTERRUPT_MASK2_SD0_LV,
 109                 .reg_offset = 1,
 110         },
 111         [AS3722_IRQ_SD1_LV] = {
 112                 .mask = AS3722_INTERRUPT_MASK2_SD1_LV,
 113                 .reg_offset = 1,
 114         },
 115         [AS3722_IRQ_SD2_LV] = {
 116                 .mask = AS3722_INTERRUPT_MASK2_SD2345_LV,
 117                 .reg_offset = 1,
 118         },
 119         [AS3722_IRQ_PWM1_OV_PROT] = {
 120                 .mask = AS3722_INTERRUPT_MASK2_PWM1_OV_PROT,
 121                 .reg_offset = 1,
 122         },
 123         [AS3722_IRQ_PWM2_OV_PROT] = {
 124                 .mask = AS3722_INTERRUPT_MASK2_PWM2_OV_PROT,
 125                 .reg_offset = 1,
 126         },
 127         [AS3722_IRQ_ENABLE2] = {
 128                 .mask = AS3722_INTERRUPT_MASK2_ENABLE2,
 129                 .reg_offset = 1,
 130         },
 131         [AS3722_IRQ_SD6_LV] = {
 132                 .mask = AS3722_INTERRUPT_MASK2_SD6_LV,
 133                 .reg_offset = 1,
 134         },
 135         [AS3722_IRQ_RTC_REP] = {
 136                 .mask = AS3722_INTERRUPT_MASK2_RTC_REP,
 137                 .reg_offset = 1,
 138         },
 139
 140         /* INT3 IRQs */
 141         [AS3722_IRQ_RTC_ALARM] = {
 142                 .mask = AS3722_INTERRUPT_MASK3_RTC_ALARM,
 143                 .reg_offset = 2,
 144         },
 145         [AS3722_IRQ_GPIO1] = {
 146                 .mask = AS3722_INTERRUPT_MASK3_GPIO1,
 147                 .reg_offset = 2,
 148         },
 149         [AS3722_IRQ_GPIO2] = {
 150                 .mask = AS3722_INTERRUPT_MASK3_GPIO2,
 151                 .reg_offset = 2,
 152         },
 153         [AS3722_IRQ_GPIO3] = {
 154                 .mask = AS3722_INTERRUPT_MASK3_GPIO3,
 155                 .reg_offset = 2,
 156         },
 157         [AS3722_IRQ_GPIO4] = {
 158                 .mask = AS3722_INTERRUPT_MASK3_GPIO4,
 159                 .reg_offset = 2,
 160         },
 161         [AS3722_IRQ_GPIO5] = {
 162                 .mask = AS3722_INTERRUPT_MASK3_GPIO5,
 163                 .reg_offset = 2,
 164         },
 165         [AS3722_IRQ_WATCHDOG] = {
 166                 .mask = AS3722_INTERRUPT_MASK3_WATCHDOG,
 167                 .reg_offset = 2,
 168         },
 169         [AS3722_IRQ_ENABLE3] = {
 170                 .mask = AS3722_INTERRUPT_MASK3_ENABLE3,
 171                 .reg_offset = 2,
 172         },
 173
 174         /* INT4 IRQs */
 175         [AS3722_IRQ_TEMP_SD0_SHUTDOWN] = {
 176                 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD0_SHUTDOWN,
 177                 .reg_offset = 3,
 178         },
 179         [AS3722_IRQ_TEMP_SD1_SHUTDOWN] = {
 180                 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD1_SHUTDOWN,
 181                 .reg_offset = 3,
 182         },
 183         [AS3722_IRQ_TEMP_SD2_SHUTDOWN] = {
 184                 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD6_SHUTDOWN,
 185                 .reg_offset = 3,
 186         },
 187         [AS3722_IRQ_TEMP_SD0_ALARM] = {
 188                 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD0_ALARM,
 189                 .reg_offset = 3,
 190         },
 191         [AS3722_IRQ_TEMP_SD1_ALARM] = {
 192                 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD1_ALARM,
 193                 .reg_offset = 3,
 194         },
 195         [AS3722_IRQ_TEMP_SD6_ALARM] = {
 196                 .mask = AS3722_INTERRUPT_MASK4_TEMP_SD6_ALARM,
 197                 .reg_offset = 3,
 198         },
 199         [AS3722_IRQ_OCCUR_ALARM_SD6] = {
 200                 .mask = AS3722_INTERRUPT_MASK4_OCCUR_ALARM_SD6,
 201                 .reg_offset = 3,
 202         },
 203         [AS3722_IRQ_ADC] = {
 204                 .mask = AS3722_INTERRUPT_MASK4_ADC,
 205                 .reg_offset = 3,
 206         },
 207 };
 208
 209 static const struct regmap_irq_chip as3722_irq_chip = {
 210         .name = "as3722",
 211         .irqs = as3722_irqs,
 212         .num_irqs = ARRAY_SIZE(as3722_irqs),
 213         .num_regs = 4,
 214         .status_base = AS3722_INTERRUPT_STATUS1_REG,
 215         .mask_base = AS3722_INTERRUPT_MASK1_REG,
 216 };
 217
 218 static int as3722_check_device_id(struct as3722 *as3722)
 219 {
 220         u32 val;
 221         int ret;
 222
 223         /* Check that this is actually a AS3722 */
 224         ret = as3722_read(as3722, AS3722_ASIC_ID1_REG, &val);
 225         if (ret < 0) {
 226                 dev_err(as3722->dev, "ASIC_ID1 read failed: %d\n", ret);
 227                 return ret;
 228         }
 229
 230         if (val != AS3722_DEVICE_ID) {
 231                 dev_err(as3722->dev, "Device is not AS3722, ID is 0x%x\n", val);
 232                 return -ENODEV;
 233         }
 234
 235         ret = as3722_read(as3722, AS3722_ASIC_ID2_REG, &val);
 236         if (ret < 0) {
 237                 dev_err(as3722->dev, "ASIC_ID2 read failed: %d\n", ret);
 238                 return ret;
 239         }
 240
 241         dev_info(as3722->dev, "AS3722 with revision 0x%x found\n", val);
 242         return 0;
 243 }
 244
 245 static int as3722_configure_pullups(struct as3722 *as3722)
 246 {
 247         int ret;
 248         u32 val = 0;
 249
 250         if (as3722->en_intern_int_pullup)
 251                 val |= AS3722_INT_PULL_UP;
 252         if (as3722->en_intern_i2c_pullup)
 253                 val |= AS3722_I2C_PULL_UP;
 254
 255         ret = as3722_update_bits(as3722, AS3722_IOVOLTAGE_REG,
 256                         AS3722_INT_PULL_UP | AS3722_I2C_PULL_UP, val);
 257         if (ret < 0)
 258                 dev_err(as3722->dev, "IOVOLTAGE_REG update failed: %d\n", ret);
 259         return ret;
 260 }
 261
 262 static const struct regmap_range as3722_readable_ranges[] = {
 263         regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_SD6_VOLTAGE_REG),
 264         regmap_reg_range(AS3722_GPIO0_CONTROL_REG, AS3722_LDO7_VOLTAGE_REG),
 265         regmap_reg_range(AS3722_LDO9_VOLTAGE_REG, AS3722_REG_SEQU_MOD3_REG),
 266         regmap_reg_range(AS3722_SD_PHSW_CTRL_REG, AS3722_PWM_CONTROL_H_REG),
 267         regmap_reg_range(AS3722_WATCHDOG_TIMER_REG, AS3722_WATCHDOG_TIMER_REG),
 268         regmap_reg_range(AS3722_WATCHDOG_SOFTWARE_SIGNAL_REG,
 269                                         AS3722_BATTERY_VOLTAGE_MONITOR2_REG),
 270         regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_PWM_VCONTROL4_REG),
 271         regmap_reg_range(AS3722_BB_CHARGER_REG, AS3722_SRAM_REG),
 272         regmap_reg_range(AS3722_RTC_ACCESS_REG, AS3722_RTC_ACCESS_REG),
 273         regmap_reg_range(AS3722_RTC_STATUS_REG, AS3722_TEMP_STATUS_REG),
 274         regmap_reg_range(AS3722_ADC0_CONTROL_REG, AS3722_ADC_CONFIGURATION_REG),
 275         regmap_reg_range(AS3722_ASIC_ID1_REG, AS3722_ASIC_ID2_REG),
 276         regmap_reg_range(AS3722_LOCK_REG, AS3722_LOCK_REG),
 277 };
 278
 279 static const struct regmap_access_table as3722_readable_table = {
 280         .yes_ranges = as3722_readable_ranges,
 281         .n_yes_ranges = ARRAY_SIZE(as3722_readable_ranges),
 282 };
 283
 284 static const struct regmap_range as3722_writable_ranges[] = {
 285         regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_SD6_VOLTAGE_REG),
 286         regmap_reg_range(AS3722_GPIO0_CONTROL_REG, AS3722_LDO7_VOLTAGE_REG),
 287         regmap_reg_range(AS3722_LDO9_VOLTAGE_REG, AS3722_GPIO_SIGNAL_OUT_REG),
 288         regmap_reg_range(AS3722_REG_SEQU_MOD1_REG, AS3722_REG_SEQU_MOD3_REG),
 289         regmap_reg_range(AS3722_SD_PHSW_CTRL_REG, AS3722_PWM_CONTROL_H_REG),
 290         regmap_reg_range(AS3722_WATCHDOG_TIMER_REG, AS3722_WATCHDOG_TIMER_REG),
 291         regmap_reg_range(AS3722_WATCHDOG_SOFTWARE_SIGNAL_REG,
 292                                         AS3722_BATTERY_VOLTAGE_MONITOR2_REG),
 293         regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_PWM_VCONTROL4_REG),
 294         regmap_reg_range(AS3722_BB_CHARGER_REG, AS3722_SRAM_REG),
 295         regmap_reg_range(AS3722_INTERRUPT_MASK1_REG, AS3722_TEMP_STATUS_REG),
 296         regmap_reg_range(AS3722_ADC0_CONTROL_REG, AS3722_ADC1_CONTROL_REG),
 297         regmap_reg_range(AS3722_ADC1_THRESHOLD_HI_MSB_REG,
 298                                         AS3722_ADC_CONFIGURATION_REG),
 299         regmap_reg_range(AS3722_LOCK_REG, AS3722_LOCK_REG),
 300 };
 301
 302 static const struct regmap_access_table as3722_writable_table = {
 303         .yes_ranges = as3722_writable_ranges,
 304         .n_yes_ranges = ARRAY_SIZE(as3722_writable_ranges),
 305 };
 306
 307 static const struct regmap_range as3722_cacheable_ranges[] = {
 308         regmap_reg_range(AS3722_SD0_VOLTAGE_REG, AS3722_LDO11_VOLTAGE_REG),
 309         regmap_reg_range(AS3722_SD_CONTROL_REG, AS3722_LDOCONTROL1_REG),
 310 };
 311
 312 static const struct regmap_access_table as3722_volatile_table = {
 313         .no_ranges = as3722_cacheable_ranges,
 314         .n_no_ranges = ARRAY_SIZE(as3722_cacheable_ranges),
 315 };
 316
 317 static const struct regmap_config as3722_regmap_config = {
 318         .reg_bits = 8,
 319         .val_bits = 8,
 320         .max_register = AS3722_MAX_REGISTER,
 321         .cache_type = REGCACHE_RBTREE,
 322         .rd_table = &as3722_readable_table,
 323         .wr_table = &as3722_writable_table,
 324         .volatile_table = &as3722_volatile_table,
 325 };
 326
 327 static int as3722_i2c_of_probe(struct i2c_client *i2c,
 328                         struct as3722 *as3722)
 329 {
 330         struct device_node *np = i2c->dev.of_node;
 331         struct irq_data *irq_data;
 332
 333         if (!np) {
 334                 dev_err(&i2c->dev, "Device Tree not found\n");
 335                 return -EINVAL;
 336         }
 337
 338         irq_data = irq_get_irq_data(i2c->irq);
 339         if (!irq_data) {
 340                 dev_err(&i2c->dev, "Invalid IRQ: %d\n", i2c->irq);
 341                 return -EINVAL;
 342         }
 343
 344         as3722->en_intern_int_pullup = of_property_read_bool(np,
 345                                         "ams,enable-internal-int-pullup");
 346         as3722->en_intern_i2c_pullup = of_property_read_bool(np,
 347                                         "ams,enable-internal-i2c-pullup");
 348         as3722->irq_flags = irqd_get_trigger_type(irq_data);
 349         dev_dbg(&i2c->dev, "IRQ flags are 0x%08lx\n", as3722->irq_flags);
 350         return 0;
 351 }
 352
 353 static int as3722_i2c_probe(struct i2c_client *i2c,
 354                         const struct i2c_device_id *id)
 355 {
 356         struct as3722 *as3722;
 357         unsigned long irq_flags;
 358         int ret;
 359
 360         as3722 = devm_kzalloc(&i2c->dev, sizeof(struct as3722), GFP_KERNEL);
 361         if (!as3722)
 362                 return -ENOMEM;
 363
 364         as3722->dev = &i2c->dev;
 365         as3722->chip_irq = i2c->irq;
 366         i2c_set_clientdata(i2c, as3722);
 367
 368         ret = as3722_i2c_of_probe(i2c, as3722);
 369         if (ret < 0)
 370                 return ret;
 371
 372         as3722->regmap = devm_regmap_init_i2c(i2c, &as3722_regmap_config);
 373         if (IS_ERR(as3722->regmap)) {
 374                 ret = PTR_ERR(as3722->regmap);
 375                 dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
 376                 return ret;
 377         }
 378
 379         ret = as3722_check_device_id(as3722);
 380         if (ret < 0)
 381                 return ret;
 382
 383         irq_flags = as3722->irq_flags | IRQF_ONESHOT;
 384         ret = regmap_add_irq_chip(as3722->regmap, as3722->chip_irq,
 385                         irq_flags, -1, &as3722_irq_chip,
 386                         &as3722->irq_data);
 387         if (ret < 0) {
 388                 dev_err(as3722->dev, "Failed to add regmap irq: %d\n", ret);
 389                 return ret;
 390         }
 391
 392         ret = as3722_configure_pullups(as3722);
 393         if (ret < 0)
 394                 goto scrub;
 395
 396         ret = mfd_add_devices(&i2c->dev, -1, as3722_devs,
 397                         ARRAY_SIZE(as3722_devs), NULL, 0,
 398                         regmap_irq_get_domain(as3722->irq_data));
 399         if (ret) {
 400                 dev_err(as3722->dev, "Failed to add MFD devices: %d\n", ret);
 401                 goto scrub;
 402         }
 403
 404         dev_dbg(as3722->dev, "AS3722 core driver initialized successfully\n");
 405         return 0;
 406
 407 scrub:
 408         regmap_del_irq_chip(as3722->chip_irq, as3722->irq_data);
 409         return ret;
 410 }
 411
 412 static int as3722_i2c_remove(struct i2c_client *i2c)
 413 {
 414         struct as3722 *as3722 = i2c_get_clientdata(i2c);
 415
 416         mfd_remove_devices(as3722->dev);
 417         regmap_del_irq_chip(as3722->chip_irq, as3722->irq_data);
 418         return 0;
 419 }
 420
 421 static const struct of_device_id as3722_of_match[] = {
 422         { .compatible = "ams,as3722", },
 423         {},
 424 };
 425 MODULE_DEVICE_TABLE(of, as3722_of_match);
 426
 427 static const struct i2c_device_id as3722_i2c_id[] = {
 428         { "as3722", 0 },
 429         {},
 430 };
 431 MODULE_DEVICE_TABLE(i2c, as3722_i2c_id);
 432
 433 static struct i2c_driver as3722_i2c_driver = {
 434         .driver = {
 435                 .name = "as3722",
 436                 .owner = THIS_MODULE,
 437                 .of_match_table = as3722_of_match,
 438         },
 439         .probe = as3722_i2c_probe,
 440         .remove = as3722_i2c_remove,
 441         .id_table = as3722_i2c_id,
 442 };
 443
 444 module_i2c_driver(as3722_i2c_driver);
 445
 446 MODULE_DESCRIPTION("I2C support for AS3722 PMICs");
 447 MODULE_AUTHOR("Florian Lobmaier <florian.lobmaier@ams.com>");
 448 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
 449 MODULE_LICENSE("GPL");