drivers/mfd/palmas.c

   1 /*
   2  * TI Palmas MFD Driver
   3  *
   4  * Copyright 2011-2012 Texas Instruments Inc.
   5  *
   6  * Author: Graeme Gregory <gg@slimlogic.co.uk>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify it
   9  *  under  the terms of the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the License, or (at your
  11  *  option) any later version.
  12  *
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/moduleparam.h>
  17 #include <linux/init.h>
  18 #include <linux/slab.h>
  19 #include <linux/i2c.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/irq.h>
  22 #include <linux/regmap.h>
  23 #include <linux/err.h>
  24 #include <linux/mfd/core.h>
  25 #include <linux/mfd/palmas.h>
  26 #include <linux/of_platform.h>
  27
  28 static const struct regmap_config palmas_regmap_config[PALMAS_NUM_CLIENTS] = {
  29         {
  30                 .reg_bits = 8,
  31                 .val_bits = 8,
  32                 .max_register = PALMAS_BASE_TO_REG(PALMAS_PU_PD_OD_BASE,
  33                                         PALMAS_PRIMARY_SECONDARY_PAD3),
  34         },
  35         {
  36                 .reg_bits = 8,
  37                 .val_bits = 8,
  38                 .max_register = PALMAS_BASE_TO_REG(PALMAS_GPADC_BASE,
  39                                         PALMAS_GPADC_SMPS_VSEL_MONITORING),
  40         },
  41         {
  42                 .reg_bits = 8,
  43                 .val_bits = 8,
  44                 .max_register = PALMAS_BASE_TO_REG(PALMAS_TRIM_GPADC_BASE,
  45                                         PALMAS_GPADC_TRIM16),
  46         },
  47 };
  48
  49 static const struct regmap_irq palmas_irqs[] = {
  50         /* INT1 IRQs */
  51         [PALMAS_CHARG_DET_N_VBUS_OVV_IRQ] = {
  52                 .mask = PALMAS_INT1_STATUS_CHARG_DET_N_VBUS_OVV,
  53         },
  54         [PALMAS_PWRON_IRQ] = {
  55                 .mask = PALMAS_INT1_STATUS_PWRON,
  56         },
  57         [PALMAS_LONG_PRESS_KEY_IRQ] = {
  58                 .mask = PALMAS_INT1_STATUS_LONG_PRESS_KEY,
  59         },
  60         [PALMAS_RPWRON_IRQ] = {
  61                 .mask = PALMAS_INT1_STATUS_RPWRON,
  62         },
  63         [PALMAS_PWRDOWN_IRQ] = {
  64                 .mask = PALMAS_INT1_STATUS_PWRDOWN,
  65         },
  66         [PALMAS_HOTDIE_IRQ] = {
  67                 .mask = PALMAS_INT1_STATUS_HOTDIE,
  68         },
  69         [PALMAS_VSYS_MON_IRQ] = {
  70                 .mask = PALMAS_INT1_STATUS_VSYS_MON,
  71         },
  72         [PALMAS_VBAT_MON_IRQ] = {
  73                 .mask = PALMAS_INT1_STATUS_VBAT_MON,
  74         },
  75         /* INT2 IRQs*/
  76         [PALMAS_RTC_ALARM_IRQ] = {
  77                 .mask = PALMAS_INT2_STATUS_RTC_ALARM,
  78                 .reg_offset = 1,
  79         },
  80         [PALMAS_RTC_TIMER_IRQ] = {
  81                 .mask = PALMAS_INT2_STATUS_RTC_TIMER,
  82                 .reg_offset = 1,
  83         },
  84         [PALMAS_WDT_IRQ] = {
  85                 .mask = PALMAS_INT2_STATUS_WDT,
  86                 .reg_offset = 1,
  87         },
  88         [PALMAS_BATREMOVAL_IRQ] = {
  89                 .mask = PALMAS_INT2_STATUS_BATREMOVAL,
  90                 .reg_offset = 1,
  91         },
  92         [PALMAS_RESET_IN_IRQ] = {
  93                 .mask = PALMAS_INT2_STATUS_RESET_IN,
  94                 .reg_offset = 1,
  95         },
  96         [PALMAS_FBI_BB_IRQ] = {
  97                 .mask = PALMAS_INT2_STATUS_FBI_BB,
  98                 .reg_offset = 1,
  99         },
 100         [PALMAS_SHORT_IRQ] = {
 101                 .mask = PALMAS_INT2_STATUS_SHORT,
 102                 .reg_offset = 1,
 103         },
 104         [PALMAS_VAC_ACOK_IRQ] = {
 105                 .mask = PALMAS_INT2_STATUS_VAC_ACOK,
 106                 .reg_offset = 1,
 107         },
 108         /* INT3 IRQs */
 109         [PALMAS_GPADC_AUTO_0_IRQ] = {
 110                 .mask = PALMAS_INT3_STATUS_GPADC_AUTO_0,
 111                 .reg_offset = 2,
 112         },
 113         [PALMAS_GPADC_AUTO_1_IRQ] = {
 114                 .mask = PALMAS_INT3_STATUS_GPADC_AUTO_1,
 115                 .reg_offset = 2,
 116         },
 117         [PALMAS_GPADC_EOC_SW_IRQ] = {
 118                 .mask = PALMAS_INT3_STATUS_GPADC_EOC_SW,
 119                 .reg_offset = 2,
 120         },
 121         [PALMAS_GPADC_EOC_RT_IRQ] = {
 122                 .mask = PALMAS_INT3_STATUS_GPADC_EOC_RT,
 123                 .reg_offset = 2,
 124         },
 125         [PALMAS_ID_OTG_IRQ] = {
 126                 .mask = PALMAS_INT3_STATUS_ID_OTG,
 127                 .reg_offset = 2,
 128         },
 129         [PALMAS_ID_IRQ] = {
 130                 .mask = PALMAS_INT3_STATUS_ID,
 131                 .reg_offset = 2,
 132         },
 133         [PALMAS_VBUS_OTG_IRQ] = {
 134                 .mask = PALMAS_INT3_STATUS_VBUS_OTG,
 135                 .reg_offset = 2,
 136         },
 137         [PALMAS_VBUS_IRQ] = {
 138                 .mask = PALMAS_INT3_STATUS_VBUS,
 139                 .reg_offset = 2,
 140         },
 141         /* INT4 IRQs */
 142         [PALMAS_GPIO_0_IRQ] = {
 143                 .mask = PALMAS_INT4_STATUS_GPIO_0,
 144                 .reg_offset = 3,
 145         },
 146         [PALMAS_GPIO_1_IRQ] = {
 147                 .mask = PALMAS_INT4_STATUS_GPIO_1,
 148                 .reg_offset = 3,
 149         },
 150         [PALMAS_GPIO_2_IRQ] = {
 151                 .mask = PALMAS_INT4_STATUS_GPIO_2,
 152                 .reg_offset = 3,
 153         },
 154         [PALMAS_GPIO_3_IRQ] = {
 155                 .mask = PALMAS_INT4_STATUS_GPIO_3,
 156                 .reg_offset = 3,
 157         },
 158         [PALMAS_GPIO_4_IRQ] = {
 159                 .mask = PALMAS_INT4_STATUS_GPIO_4,
 160                 .reg_offset = 3,
 161         },
 162         [PALMAS_GPIO_5_IRQ] = {
 163                 .mask = PALMAS_INT4_STATUS_GPIO_5,
 164                 .reg_offset = 3,
 165         },
 166         [PALMAS_GPIO_6_IRQ] = {
 167                 .mask = PALMAS_INT4_STATUS_GPIO_6,
 168                 .reg_offset = 3,
 169         },
 170         [PALMAS_GPIO_7_IRQ] = {
 171                 .mask = PALMAS_INT4_STATUS_GPIO_7,
 172                 .reg_offset = 3,
 173         },
 174 };
 175
 176 static struct regmap_irq_chip palmas_irq_chip = {
 177         .name = "palmas",
 178         .irqs = palmas_irqs,
 179         .num_irqs = ARRAY_SIZE(palmas_irqs),
 180
 181         .num_regs = 4,
 182         .irq_reg_stride = 5,
 183         .status_base = PALMAS_BASE_TO_REG(PALMAS_INTERRUPT_BASE,
 184                         PALMAS_INT1_STATUS),
 185         .mask_base = PALMAS_BASE_TO_REG(PALMAS_INTERRUPT_BASE,
 186                         PALMAS_INT1_MASK),
 187 };
 188
 189 static int palmas_set_pdata_irq_flag(struct i2c_client *i2c,
 190                 struct palmas_platform_data *pdata)
 191 {
 192         struct irq_data *irq_data = irq_get_irq_data(i2c->irq);
 193         if (!irq_data) {
 194                 dev_err(&i2c->dev, "Invalid IRQ: %d\n", i2c->irq);
 195                 return -EINVAL;
 196         }
 197
 198         pdata->irq_flags = irqd_get_trigger_type(irq_data);
 199         dev_info(&i2c->dev, "Irq flag is 0x%08x\n", pdata->irq_flags);
 200         return 0;
 201 }
 202
 203 static void palmas_dt_to_pdata(struct i2c_client *i2c,
 204                 struct palmas_platform_data *pdata)
 205 {
 206         struct device_node *node = i2c->dev.of_node;
 207         int ret;
 208         u32 prop;
 209
 210         ret = of_property_read_u32(node, "ti,mux-pad1", &prop);
 211         if (!ret) {
 212                 pdata->mux_from_pdata = 1;
 213                 pdata->pad1 = prop;
 214         }
 215
 216         ret = of_property_read_u32(node, "ti,mux-pad2", &prop);
 217         if (!ret) {
 218                 pdata->mux_from_pdata = 1;
 219                 pdata->pad2 = prop;
 220         }
 221
 222         /* The default for this register is all masked */
 223         ret = of_property_read_u32(node, "ti,power-ctrl", &prop);
 224         if (!ret)
 225                 pdata->power_ctrl = prop;
 226         else
 227                 pdata->power_ctrl = PALMAS_POWER_CTRL_NSLEEP_MASK |
 228                                         PALMAS_POWER_CTRL_ENABLE1_MASK |
 229                                         PALMAS_POWER_CTRL_ENABLE2_MASK;
 230         if (i2c->irq)
 231                 palmas_set_pdata_irq_flag(i2c, pdata);
 232 }
 233
 234 static int palmas_i2c_probe(struct i2c_client *i2c,
 235                             const struct i2c_device_id *id)
 236 {
 237         struct palmas *palmas;
 238         struct palmas_platform_data *pdata;
 239         struct device_node *node = i2c->dev.of_node;
 240         int ret = 0, i;
 241         unsigned int reg, addr;
 242         int slave;
 243
 244         pdata = dev_get_platdata(&i2c->dev);
 245
 246         if (node && !pdata) {
 247                 pdata = devm_kzalloc(&i2c->dev, sizeof(*pdata), GFP_KERNEL);
 248
 249                 if (!pdata)
 250                         return -ENOMEM;
 251
 252                 palmas_dt_to_pdata(i2c, pdata);
 253         }
 254
 255         if (!pdata)
 256                 return -EINVAL;
 257
 258         palmas = devm_kzalloc(&i2c->dev, sizeof(struct palmas), GFP_KERNEL);
 259         if (palmas == NULL)
 260                 return -ENOMEM;
 261
 262         i2c_set_clientdata(i2c, palmas);
 263         palmas->dev = &i2c->dev;
 264         palmas->id = id->driver_data;
 265         palmas->irq = i2c->irq;
 266
 267         for (i = 0; i < PALMAS_NUM_CLIENTS; i++) {
 268                 if (i == 0)
 269                         palmas->i2c_clients[i] = i2c;
 270                 else {
 271                         palmas->i2c_clients[i] =
 272                                         i2c_new_dummy(i2c->adapter,
 273                                                         i2c->addr + i);
 274                         if (!palmas->i2c_clients[i]) {
 275                                 dev_err(palmas->dev,
 276                                         "can't attach client %d\n", i);
 277                                 ret = -ENOMEM;
 278                                 goto err;
 279                         }
 280                         palmas->i2c_clients[i]->dev.of_node = of_node_get(node);
 281                 }
 282                 palmas->regmap[i] = devm_regmap_init_i2c(palmas->i2c_clients[i],
 283                                 &palmas_regmap_config[i]);
 284                 if (IS_ERR(palmas->regmap[i])) {
 285                         ret = PTR_ERR(palmas->regmap[i]);
 286                         dev_err(palmas->dev,
 287                                 "Failed to allocate regmap %d, err: %d\n",
 288                                 i, ret);
 289                         goto err;
 290                 }
 291         }
 292
 293         /* Change interrupt line output polarity */
 294         if (pdata->irq_flags & IRQ_TYPE_LEVEL_HIGH)
 295                 reg = PALMAS_POLARITY_CTRL_INT_POLARITY;
 296         else
 297                 reg = 0;
 298         ret = palmas_update_bits(palmas, PALMAS_PU_PD_OD_BASE,
 299                         PALMAS_POLARITY_CTRL, PALMAS_POLARITY_CTRL_INT_POLARITY,
 300                         reg);
 301         if (ret < 0) {
 302                 dev_err(palmas->dev, "POLARITY_CTRL updat failed: %d\n", ret);
 303                 goto err;
 304         }
 305
 306         /* Change IRQ into clear on read mode for efficiency */
 307         slave = PALMAS_BASE_TO_SLAVE(PALMAS_INTERRUPT_BASE);
 308         addr = PALMAS_BASE_TO_REG(PALMAS_INTERRUPT_BASE, PALMAS_INT_CTRL);
 309         reg = PALMAS_INT_CTRL_INT_CLEAR;
 310
 311         regmap_write(palmas->regmap[slave], addr, reg);
 312
 313         ret = regmap_add_irq_chip(palmas->regmap[slave], palmas->irq,
 314                         IRQF_ONESHOT | pdata->irq_flags, 0, &palmas_irq_chip,
 315                         &palmas->irq_data);
 316         if (ret < 0)
 317                 goto err;
 318
 319         slave = PALMAS_BASE_TO_SLAVE(PALMAS_PU_PD_OD_BASE);
 320         addr = PALMAS_BASE_TO_REG(PALMAS_PU_PD_OD_BASE,
 321                         PALMAS_PRIMARY_SECONDARY_PAD1);
 322
 323         if (pdata->mux_from_pdata) {
 324                 reg = pdata->pad1;
 325                 ret = regmap_write(palmas->regmap[slave], addr, reg);
 326                 if (ret)
 327                         goto err_irq;
 328         } else {
 329                 ret = regmap_read(palmas->regmap[slave], addr, &reg);
 330                 if (ret)
 331                         goto err_irq;
 332         }
 333
 334         if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_0))
 335                 palmas->gpio_muxed |= PALMAS_GPIO_0_MUXED;
 336         if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK))
 337                 palmas->gpio_muxed |= PALMAS_GPIO_1_MUXED;
 338         else if ((reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK) ==
 339                         (2 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT))
 340                 palmas->led_muxed |= PALMAS_LED1_MUXED;
 341         else if ((reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_MASK) ==
 342                         (3 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_1_SHIFT))
 343                 palmas->pwm_muxed |= PALMAS_PWM1_MUXED;
 344         if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_2_MASK))
 345                 palmas->gpio_muxed |= PALMAS_GPIO_2_MUXED;
 346         else if ((reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_2_MASK) ==
 347                         (2 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_2_SHIFT))
 348                 palmas->led_muxed |= PALMAS_LED2_MUXED;
 349         else if ((reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_2_MASK) ==
 350                         (3 << PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_2_SHIFT))
 351                 palmas->pwm_muxed |= PALMAS_PWM2_MUXED;
 352         if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD1_GPIO_3))
 353                 palmas->gpio_muxed |= PALMAS_GPIO_3_MUXED;
 354
 355         addr = PALMAS_BASE_TO_REG(PALMAS_PU_PD_OD_BASE,
 356                         PALMAS_PRIMARY_SECONDARY_PAD2);
 357
 358         if (pdata->mux_from_pdata) {
 359                 reg = pdata->pad2;
 360                 ret = regmap_write(palmas->regmap[slave], addr, reg);
 361                 if (ret)
 362                         goto err_irq;
 363         } else {
 364                 ret = regmap_read(palmas->regmap[slave], addr, &reg);
 365                 if (ret)
 366                         goto err_irq;
 367         }
 368
 369         if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD2_GPIO_4))
 370                 palmas->gpio_muxed |= PALMAS_GPIO_4_MUXED;
 371         if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD2_GPIO_5_MASK))
 372                 palmas->gpio_muxed |= PALMAS_GPIO_5_MUXED;
 373         if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD2_GPIO_6))
 374                 palmas->gpio_muxed |= PALMAS_GPIO_6_MUXED;
 375         if (!(reg & PALMAS_PRIMARY_SECONDARY_PAD2_GPIO_7_MASK))
 376                 palmas->gpio_muxed |= PALMAS_GPIO_7_MUXED;
 377
 378         dev_info(palmas->dev, "Muxing GPIO %x, PWM %x, LED %x\n",
 379                         palmas->gpio_muxed, palmas->pwm_muxed,
 380                         palmas->led_muxed);
 381
 382         reg = pdata->power_ctrl;
 383
 384         slave = PALMAS_BASE_TO_SLAVE(PALMAS_PMU_CONTROL_BASE);
 385         addr = PALMAS_BASE_TO_REG(PALMAS_PMU_CONTROL_BASE, PALMAS_POWER_CTRL);
 386
 387         ret = regmap_write(palmas->regmap[slave], addr, reg);
 388         if (ret)
 389                 goto err_irq;
 390
 391         /*
 392          * If we are probing with DT do this the DT way and return here
 393          * otherwise continue and add devices using mfd helpers.
 394          */
 395         if (node) {
 396                 ret = of_platform_populate(node, NULL, NULL, &i2c->dev);
 397                 if (ret < 0)
 398                         goto err_irq;
 399                 else
 400                         return ret;
 401         }
 402
 403         return ret;
 404
 405 err_irq:
 406         regmap_del_irq_chip(palmas->irq, palmas->irq_data);
 407 err:
 408         return ret;
 409 }
 410
 411 static int palmas_i2c_remove(struct i2c_client *i2c)
 412 {
 413         struct palmas *palmas = i2c_get_clientdata(i2c);
 414
 415         mfd_remove_devices(palmas->dev);
 416         regmap_del_irq_chip(palmas->irq, palmas->irq_data);
 417
 418         return 0;
 419 }
 420
 421 static const struct i2c_device_id palmas_i2c_id[] = {
 422         { "palmas", },
 423         { "twl6035", },
 424         { "twl6037", },
 425         { "tps65913", },
 426         { /* end */ }
 427 };
 428 MODULE_DEVICE_TABLE(i2c, palmas_i2c_id);
 429
 430 static struct of_device_id of_palmas_match_tbl[] = {
 431         { .compatible = "ti,palmas", },
 432         { /* end */ }
 433 };
 434
 435 static struct i2c_driver palmas_i2c_driver = {
 436         .driver = {
 437                    .name = "palmas",
 438                    .of_match_table = of_palmas_match_tbl,
 439                    .owner = THIS_MODULE,
 440         },
 441         .probe = palmas_i2c_probe,
 442         .remove = palmas_i2c_remove,
 443         .id_table = palmas_i2c_id,
 444 };
 445
 446 static int __init palmas_i2c_init(void)
 447 {
 448         return i2c_add_driver(&palmas_i2c_driver);
 449 }
 450 /* init early so consumer devices can complete system boot */
 451 subsys_initcall(palmas_i2c_init);
 452
 453 static void __exit palmas_i2c_exit(void)
 454 {
 455         i2c_del_driver(&palmas_i2c_driver);
 456 }
 457 module_exit(palmas_i2c_exit);
 458
 459 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
 460 MODULE_DESCRIPTION("Palmas chip family multi-function driver");
 461 MODULE_LICENSE("GPL");