drivers/gpio/gpio-pca953x.c

   1 /*
   2  *  PCA953x 4/8/16/24/40 bit I/O ports
   3  *
   4  *  Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
   5  *  Copyright (C) 2007 Marvell International Ltd.
   6  *
   7  *  Derived from drivers/i2c/chips/pca9539.c
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; version 2 of the License.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/gpio.h>
  17 #include <linux/gpio/consumer.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/i2c.h>
  20 #include <linux/platform_data/pca953x.h>
  21 #include <linux/slab.h>
  22 #include <asm/unaligned.h>
  23 #include <linux/of_platform.h>
  24 #include <linux/acpi.h>
  25 #include <linux/regulator/consumer.h>
  26
  27 #define PCA953X_INPUT           0
  28 #define PCA953X_OUTPUT          1
  29 #define PCA953X_INVERT          2
  30 #define PCA953X_DIRECTION       3
  31
  32 #define REG_ADDR_AI             0x80
  33
  34 #define PCA957X_IN              0
  35 #define PCA957X_INVRT           1
  36 #define PCA957X_BKEN            2
  37 #define PCA957X_PUPD            3
  38 #define PCA957X_CFG             4
  39 #define PCA957X_OUT             5
  40 #define PCA957X_MSK             6
  41 #define PCA957X_INTS            7
  42
  43 #define PCAL953X_IN_LATCH       34
  44 #define PCAL953X_INT_MASK       37
  45 #define PCAL953X_INT_STAT       38
  46
  47 #define PCA_GPIO_MASK           0x00FF
  48 #define PCA_INT                 0x0100
  49 #define PCA_PCAL                0x0200
  50 #define PCA953X_TYPE            0x1000
  51 #define PCA957X_TYPE            0x2000
  52 #define PCA_TYPE_MASK           0xF000
  53
  54 #define PCA_CHIP_TYPE(x)        ((x) & PCA_TYPE_MASK)
  55
  56 static const struct i2c_device_id pca953x_id[] = {
  57         { "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
  58         { "pca9534", 8  | PCA953X_TYPE | PCA_INT, },
  59         { "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
  60         { "pca9536", 4  | PCA953X_TYPE, },
  61         { "pca9537", 4  | PCA953X_TYPE | PCA_INT, },
  62         { "pca9538", 8  | PCA953X_TYPE | PCA_INT, },
  63         { "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
  64         { "pca9554", 8  | PCA953X_TYPE | PCA_INT, },
  65         { "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
  66         { "pca9556", 8  | PCA953X_TYPE, },
  67         { "pca9557", 8  | PCA953X_TYPE, },
  68         { "pca9574", 8  | PCA957X_TYPE | PCA_INT, },
  69         { "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
  70         { "pca9698", 40 | PCA953X_TYPE, },
  71
  72         { "pcal9555a", 16 | PCA953X_TYPE | PCA_INT | PCA_PCAL, },
  73
  74         { "max7310", 8  | PCA953X_TYPE, },
  75         { "max7312", 16 | PCA953X_TYPE | PCA_INT, },
  76         { "max7313", 16 | PCA953X_TYPE | PCA_INT, },
  77         { "max7315", 8  | PCA953X_TYPE | PCA_INT, },
  78         { "max7318", 16 | PCA953X_TYPE | PCA_INT, },
  79         { "pca6107", 8  | PCA953X_TYPE | PCA_INT, },
  80         { "tca6408", 8  | PCA953X_TYPE | PCA_INT, },
  81         { "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
  82         { "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
  83         { "tca9539", 16 | PCA953X_TYPE | PCA_INT, },
  84         { "xra1202", 8  | PCA953X_TYPE },
  85         { }
  86 };
  87 MODULE_DEVICE_TABLE(i2c, pca953x_id);
  88
  89 static const struct acpi_device_id pca953x_acpi_ids[] = {
  90         { "INT3491", 16 | PCA953X_TYPE | PCA_INT | PCA_PCAL, },
  91         { }
  92 };
  93 MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);
  94
  95 #define MAX_BANK 5
  96 #define BANK_SZ 8
  97
  98 #define NBANK(chip) DIV_ROUND_UP(chip->gpio_chip.ngpio, BANK_SZ)
  99
 100 struct pca953x_reg_config {
 101         int direction;
 102         int output;
 103         int input;
 104 };
 105
 106 static const struct pca953x_reg_config pca953x_regs = {
 107         .direction = PCA953X_DIRECTION,
 108         .output = PCA953X_OUTPUT,
 109         .input = PCA953X_INPUT,
 110 };
 111
 112 static const struct pca953x_reg_config pca957x_regs = {
 113         .direction = PCA957X_CFG,
 114         .output = PCA957X_OUT,
 115         .input = PCA957X_IN,
 116 };
 117
 118 struct pca953x_chip {
 119         unsigned gpio_start;
 120         u8 reg_output[MAX_BANK];
 121         u8 reg_direction[MAX_BANK];
 122         struct mutex i2c_lock;
 123
 124 #ifdef CONFIG_GPIO_PCA953X_IRQ
 125         struct mutex irq_lock;
 126         u8 irq_mask[MAX_BANK];
 127         u8 irq_stat[MAX_BANK];
 128         u8 irq_trig_raise[MAX_BANK];
 129         u8 irq_trig_fall[MAX_BANK];
 130 #endif
 131
 132         struct i2c_client *client;
 133         struct gpio_chip gpio_chip;
 134         const char *const *names;
 135         unsigned long driver_data;
 136         struct regulator *regulator;
 137
 138         const struct pca953x_reg_config *regs;
 139
 140         int (*write_regs)(struct pca953x_chip *, int, u8 *);
 141         int (*read_regs)(struct pca953x_chip *, int, u8 *);
 142 };
 143
 144 static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
 145                                 int off)
 146 {
 147         int ret;
 148         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 149         int offset = off / BANK_SZ;
 150
 151         ret = i2c_smbus_read_byte_data(chip->client,
 152                                 (reg << bank_shift) + offset);
 153         *val = ret;
 154
 155         if (ret < 0) {
 156                 dev_err(&chip->client->dev, "failed reading register\n");
 157                 return ret;
 158         }
 159
 160         return 0;
 161 }
 162
 163 static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
 164                                 int off)
 165 {
 166         int ret;
 167         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 168         int offset = off / BANK_SZ;
 169
 170         ret = i2c_smbus_write_byte_data(chip->client,
 171                                         (reg << bank_shift) + offset, val);
 172
 173         if (ret < 0) {
 174                 dev_err(&chip->client->dev, "failed writing register\n");
 175                 return ret;
 176         }
 177
 178         return 0;
 179 }
 180
 181 static int pca953x_write_regs_8(struct pca953x_chip *chip, int reg, u8 *val)
 182 {
 183         return i2c_smbus_write_byte_data(chip->client, reg, *val);
 184 }
 185
 186 static int pca953x_write_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
 187 {
 188         __le16 word = cpu_to_le16(get_unaligned((u16 *)val));
 189
 190         return i2c_smbus_write_word_data(chip->client,
 191                                          reg << 1, (__force u16)word);
 192 }
 193
 194 static int pca957x_write_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
 195 {
 196         int ret;
 197
 198         ret = i2c_smbus_write_byte_data(chip->client, reg << 1, val[0]);
 199         if (ret < 0)
 200                 return ret;
 201
 202         return i2c_smbus_write_byte_data(chip->client, (reg << 1) + 1, val[1]);
 203 }
 204
 205 static int pca953x_write_regs_24(struct pca953x_chip *chip, int reg, u8 *val)
 206 {
 207         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 208
 209         return i2c_smbus_write_i2c_block_data(chip->client,
 210                                               (reg << bank_shift) | REG_ADDR_AI,
 211                                               NBANK(chip), val);
 212 }
 213
 214 static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
 215 {
 216         int ret = 0;
 217
 218         ret = chip->write_regs(chip, reg, val);
 219         if (ret < 0) {
 220                 dev_err(&chip->client->dev, "failed writing register\n");
 221                 return ret;
 222         }
 223
 224         return 0;
 225 }
 226
 227 static int pca953x_read_regs_8(struct pca953x_chip *chip, int reg, u8 *val)
 228 {
 229         int ret;
 230
 231         ret = i2c_smbus_read_byte_data(chip->client, reg);
 232         *val = ret;
 233
 234         return ret;
 235 }
 236
 237 static int pca953x_read_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
 238 {
 239         int ret;
 240
 241         ret = i2c_smbus_read_word_data(chip->client, reg << 1);
 242         val[0] = (u16)ret & 0xFF;
 243         val[1] = (u16)ret >> 8;
 244
 245         return ret;
 246 }
 247
 248 static int pca953x_read_regs_24(struct pca953x_chip *chip, int reg, u8 *val)
 249 {
 250         int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 251
 252         return i2c_smbus_read_i2c_block_data(chip->client,
 253                                              (reg << bank_shift) | REG_ADDR_AI,
 254                                              NBANK(chip), val);
 255 }
 256
 257 static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
 258 {
 259         int ret;
 260
 261         ret = chip->read_regs(chip, reg, val);
 262         if (ret < 0) {
 263                 dev_err(&chip->client->dev, "failed reading register\n");
 264                 return ret;
 265         }
 266
 267         return 0;
 268 }
 269
 270 static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
 271 {
 272         struct pca953x_chip *chip = gpiochip_get_data(gc);
 273         u8 reg_val;
 274         int ret;
 275
 276         mutex_lock(&chip->i2c_lock);
 277         reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));
 278
 279         ret = pca953x_write_single(chip, chip->regs->direction, reg_val, off);
 280         if (ret)
 281                 goto exit;
 282
 283         chip->reg_direction[off / BANK_SZ] = reg_val;
 284 exit:
 285         mutex_unlock(&chip->i2c_lock);
 286         return ret;
 287 }
 288
 289 static int pca953x_gpio_direction_output(struct gpio_chip *gc,
 290                 unsigned off, int val)
 291 {
 292         struct pca953x_chip *chip = gpiochip_get_data(gc);
 293         u8 reg_val;
 294         int ret;
 295
 296         mutex_lock(&chip->i2c_lock);
 297         /* set output level */
 298         if (val)
 299                 reg_val = chip->reg_output[off / BANK_SZ]
 300                         | (1u << (off % BANK_SZ));
 301         else
 302                 reg_val = chip->reg_output[off / BANK_SZ]
 303                         & ~(1u << (off % BANK_SZ));
 304
 305         ret = pca953x_write_single(chip, chip->regs->output, reg_val, off);
 306         if (ret)
 307                 goto exit;
 308
 309         chip->reg_output[off / BANK_SZ] = reg_val;
 310
 311         /* then direction */
 312         reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
 313         ret = pca953x_write_single(chip, chip->regs->direction, reg_val, off);
 314         if (ret)
 315                 goto exit;
 316
 317         chip->reg_direction[off / BANK_SZ] = reg_val;
 318 exit:
 319         mutex_unlock(&chip->i2c_lock);
 320         return ret;
 321 }
 322
 323 static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
 324 {
 325         struct pca953x_chip *chip = gpiochip_get_data(gc);
 326         u32 reg_val;
 327         int ret;
 328
 329         mutex_lock(&chip->i2c_lock);
 330         ret = pca953x_read_single(chip, chip->regs->input, &reg_val, off);
 331         mutex_unlock(&chip->i2c_lock);
 332         if (ret < 0) {
 333                 /* NOTE:  diagnostic already emitted; that's all we should
 334                  * do unless gpio_*_value_cansleep() calls become different
 335                  * from their nonsleeping siblings (and report faults).
 336                  */
 337                 return 0;
 338         }
 339
 340         return (reg_val & (1u << (off % BANK_SZ))) ? 1 : 0;
 341 }
 342
 343 static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
 344 {
 345         struct pca953x_chip *chip = gpiochip_get_data(gc);
 346         u8 reg_val;
 347         int ret;
 348
 349         mutex_lock(&chip->i2c_lock);
 350         if (val)
 351                 reg_val = chip->reg_output[off / BANK_SZ]
 352                         | (1u << (off % BANK_SZ));
 353         else
 354                 reg_val = chip->reg_output[off / BANK_SZ]
 355                         & ~(1u << (off % BANK_SZ));
 356
 357         ret = pca953x_write_single(chip, chip->regs->output, reg_val, off);
 358         if (ret)
 359                 goto exit;
 360
 361         chip->reg_output[off / BANK_SZ] = reg_val;
 362 exit:
 363         mutex_unlock(&chip->i2c_lock);
 364 }
 365
 366 static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
 367                                       unsigned long *mask, unsigned long *bits)
 368 {
 369         struct pca953x_chip *chip = gpiochip_get_data(gc);
 370         unsigned int bank_mask, bank_val;
 371         int bank_shift, bank;
 372         u8 reg_val[MAX_BANK];
 373         int ret;
 374
 375         bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
 376
 377         mutex_lock(&chip->i2c_lock);
 378         memcpy(reg_val, chip->reg_output, NBANK(chip));
 379         for (bank = 0; bank < NBANK(chip); bank++) {
 380                 bank_mask = mask[bank / sizeof(*mask)] >>
 381                            ((bank % sizeof(*mask)) * 8);
 382                 if (bank_mask) {
 383                         bank_val = bits[bank / sizeof(*bits)] >>
 384                                   ((bank % sizeof(*bits)) * 8);
 385                         bank_val &= bank_mask;
 386                         reg_val[bank] = (reg_val[bank] & ~bank_mask) | bank_val;
 387                 }
 388         }
 389
 390         ret = i2c_smbus_write_i2c_block_data(chip->client,
 391                                              chip->regs->output << bank_shift,
 392                                              NBANK(chip), reg_val);
 393         if (ret)
 394                 goto exit;
 395
 396         memcpy(chip->reg_output, reg_val, NBANK(chip));
 397 exit:
 398         mutex_unlock(&chip->i2c_lock);
 399 }
 400
 401 static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
 402 {
 403         struct gpio_chip *gc;
 404
 405         gc = &chip->gpio_chip;
 406
 407         gc->direction_input  = pca953x_gpio_direction_input;
 408         gc->direction_output = pca953x_gpio_direction_output;
 409         gc->get = pca953x_gpio_get_value;
 410         gc->set = pca953x_gpio_set_value;
 411         gc->set_multiple = pca953x_gpio_set_multiple;
 412         gc->can_sleep = true;
 413
 414         gc->base = chip->gpio_start;
 415         gc->ngpio = gpios;
 416         gc->label = chip->client->name;
 417         gc->parent = &chip->client->dev;
 418         gc->owner = THIS_MODULE;
 419         gc->names = chip->names;
 420 }
 421
 422 #ifdef CONFIG_GPIO_PCA953X_IRQ
 423 static void pca953x_irq_mask(struct irq_data *d)
 424 {
 425         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 426         struct pca953x_chip *chip = gpiochip_get_data(gc);
 427
 428         chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));
 429 }
 430
 431 static void pca953x_irq_unmask(struct irq_data *d)
 432 {
 433         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 434         struct pca953x_chip *chip = gpiochip_get_data(gc);
 435
 436         chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
 437 }
 438
 439 static void pca953x_irq_bus_lock(struct irq_data *d)
 440 {
 441         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 442         struct pca953x_chip *chip = gpiochip_get_data(gc);
 443
 444         mutex_lock(&chip->irq_lock);
 445 }
 446
 447 static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
 448 {
 449         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 450         struct pca953x_chip *chip = gpiochip_get_data(gc);
 451         u8 new_irqs;
 452         int level, i;
 453         u8 invert_irq_mask[MAX_BANK];
 454
 455         if (chip->driver_data & PCA_PCAL) {
 456                 /* Enable latch on interrupt-enabled inputs */
 457                 pca953x_write_regs(chip, PCAL953X_IN_LATCH, chip->irq_mask);
 458
 459                 for (i = 0; i < NBANK(chip); i++)
 460                         invert_irq_mask[i] = ~chip->irq_mask[i];
 461
 462                 /* Unmask enabled interrupts */
 463                 pca953x_write_regs(chip, PCAL953X_INT_MASK, invert_irq_mask);
 464         }
 465
 466         /* Look for any newly setup interrupt */
 467         for (i = 0; i < NBANK(chip); i++) {
 468                 new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i];
 469                 new_irqs &= ~chip->reg_direction[i];
 470
 471                 while (new_irqs) {
 472                         level = __ffs(new_irqs);
 473                         pca953x_gpio_direction_input(&chip->gpio_chip,
 474                                                         level + (BANK_SZ * i));
 475                         new_irqs &= ~(1 << level);
 476                 }
 477         }
 478
 479         mutex_unlock(&chip->irq_lock);
 480 }
 481
 482 static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
 483 {
 484         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
 485         struct pca953x_chip *chip = gpiochip_get_data(gc);
 486         int bank_nb = d->hwirq / BANK_SZ;
 487         u8 mask = 1 << (d->hwirq % BANK_SZ);
 488
 489         if (!(type & IRQ_TYPE_EDGE_BOTH)) {
 490                 dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
 491                         d->irq, type);
 492                 return -EINVAL;
 493         }
 494
 495         if (type & IRQ_TYPE_EDGE_FALLING)
 496                 chip->irq_trig_fall[bank_nb] |= mask;
 497         else
 498                 chip->irq_trig_fall[bank_nb] &= ~mask;
 499
 500         if (type & IRQ_TYPE_EDGE_RISING)
 501                 chip->irq_trig_raise[bank_nb] |= mask;
 502         else
 503                 chip->irq_trig_raise[bank_nb] &= ~mask;
 504
 505         return 0;
 506 }
 507
 508 static struct irq_chip pca953x_irq_chip = {
 509         .name                   = "pca953x",
 510         .irq_mask               = pca953x_irq_mask,
 511         .irq_unmask             = pca953x_irq_unmask,
 512         .irq_bus_lock           = pca953x_irq_bus_lock,
 513         .irq_bus_sync_unlock    = pca953x_irq_bus_sync_unlock,
 514         .irq_set_type           = pca953x_irq_set_type,
 515 };
 516
 517 static bool pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
 518 {
 519         u8 cur_stat[MAX_BANK];
 520         u8 old_stat[MAX_BANK];
 521         bool pending_seen = false;
 522         bool trigger_seen = false;
 523         u8 trigger[MAX_BANK];
 524         int ret, i;
 525
 526         if (chip->driver_data & PCA_PCAL) {
 527                 /* Read the current interrupt status from the device */
 528                 ret = pca953x_read_regs(chip, PCAL953X_INT_STAT, trigger);
 529                 if (ret)
 530                         return false;
 531
 532                 /* Check latched inputs and clear interrupt status */
 533                 ret = pca953x_read_regs(chip, PCA953X_INPUT, cur_stat);
 534                 if (ret)
 535                         return false;
 536
 537                 for (i = 0; i < NBANK(chip); i++) {
 538                         /* Apply filter for rising/falling edge selection */
 539                         pending[i] = (~cur_stat[i] & chip->irq_trig_fall[i]) |
 540                                 (cur_stat[i] & chip->irq_trig_raise[i]);
 541                         pending[i] &= trigger[i];
 542                         if (pending[i])
 543                                 pending_seen = true;
 544                 }
 545
 546                 return pending_seen;
 547         }
 548
 549         ret = pca953x_read_regs(chip, chip->regs->input, cur_stat);
 550         if (ret)
 551                 return false;
 552
 553         /* Remove output pins from the equation */
 554         for (i = 0; i < NBANK(chip); i++)
 555                 cur_stat[i] &= chip->reg_direction[i];
 556
 557         memcpy(old_stat, chip->irq_stat, NBANK(chip));
 558
 559         for (i = 0; i < NBANK(chip); i++) {
 560                 trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i];
 561                 if (trigger[i])
 562                         trigger_seen = true;
 563         }
 564
 565         if (!trigger_seen)
 566                 return false;
 567
 568         memcpy(chip->irq_stat, cur_stat, NBANK(chip));
 569
 570         for (i = 0; i < NBANK(chip); i++) {
 571                 pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) |
 572                         (cur_stat[i] & chip->irq_trig_raise[i]);
 573                 pending[i] &= trigger[i];
 574                 if (pending[i])
 575                         pending_seen = true;
 576         }
 577
 578         return pending_seen;
 579 }
 580
 581 static irqreturn_t pca953x_irq_handler(int irq, void *devid)
 582 {
 583         struct pca953x_chip *chip = devid;
 584         u8 pending[MAX_BANK];
 585         u8 level;
 586         unsigned nhandled = 0;
 587         int i;
 588
 589         if (!pca953x_irq_pending(chip, pending))
 590                 return IRQ_NONE;
 591
 592         for (i = 0; i < NBANK(chip); i++) {
 593                 while (pending[i]) {
 594                         level = __ffs(pending[i]);
 595                         handle_nested_irq(irq_find_mapping(chip->gpio_chip.irqdomain,
 596                                                         level + (BANK_SZ * i)));
 597                         pending[i] &= ~(1 << level);
 598                         nhandled++;
 599                 }
 600         }
 601
 602         return (nhandled > 0) ? IRQ_HANDLED : IRQ_NONE;
 603 }
 604
 605 static int pca953x_irq_setup(struct pca953x_chip *chip,
 606                              int irq_base)
 607 {
 608         struct i2c_client *client = chip->client;
 609         int ret, i;
 610
 611         if (client->irq && irq_base != -1
 612                         && (chip->driver_data & PCA_INT)) {
 613                 ret = pca953x_read_regs(chip,
 614                                         chip->regs->input, chip->irq_stat);
 615                 if (ret)
 616                         return ret;
 617
 618                 /*
 619                  * There is no way to know which GPIO line generated the
 620                  * interrupt.  We have to rely on the previous read for
 621                  * this purpose.
 622                  */
 623                 for (i = 0; i < NBANK(chip); i++)
 624                         chip->irq_stat[i] &= chip->reg_direction[i];
 625                 mutex_init(&chip->irq_lock);
 626
 627                 ret = devm_request_threaded_irq(&client->dev,
 628                                         client->irq,
 629                                            NULL,
 630                                            pca953x_irq_handler,
 631                                            IRQF_TRIGGER_LOW | IRQF_ONESHOT |
 632                                                    IRQF_SHARED,
 633                                            dev_name(&client->dev), chip);
 634                 if (ret) {
 635                         dev_err(&client->dev, "failed to request irq %d\n",
 636                                 client->irq);
 637                         return ret;
 638                 }
 639
 640                 ret =  gpiochip_irqchip_add_nested(&chip->gpio_chip,
 641                                                    &pca953x_irq_chip,
 642                                                    irq_base,
 643                                                    handle_simple_irq,
 644                                                    IRQ_TYPE_NONE);
 645                 if (ret) {
 646                         dev_err(&client->dev,
 647                                 "could not connect irqchip to gpiochip\n");
 648                         return ret;
 649                 }
 650
 651                 gpiochip_set_nested_irqchip(&chip->gpio_chip,
 652                                             &pca953x_irq_chip,
 653                                             client->irq);
 654         }
 655
 656         return 0;
 657 }
 658
 659 #else /* CONFIG_GPIO_PCA953X_IRQ */
 660 static int pca953x_irq_setup(struct pca953x_chip *chip,
 661                              int irq_base)
 662 {
 663         struct i2c_client *client = chip->client;
 664
 665         if (irq_base != -1 && (chip->driver_data & PCA_INT))
 666                 dev_warn(&client->dev, "interrupt support not compiled in\n");
 667
 668         return 0;
 669 }
 670 #endif
 671
 672 static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
 673 {
 674         int ret;
 675         u8 val[MAX_BANK];
 676
 677         chip->regs = &pca953x_regs;
 678
 679         ret = pca953x_read_regs(chip, chip->regs->output, chip->reg_output);
 680         if (ret)
 681                 goto out;
 682
 683         ret = pca953x_read_regs(chip, chip->regs->direction,
 684                                 chip->reg_direction);
 685         if (ret)
 686                 goto out;
 687
 688         /* set platform specific polarity inversion */
 689         if (invert)
 690                 memset(val, 0xFF, NBANK(chip));
 691         else
 692                 memset(val, 0, NBANK(chip));
 693
 694         ret = pca953x_write_regs(chip, PCA953X_INVERT, val);
 695 out:
 696         return ret;
 697 }
 698
 699 static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
 700 {
 701         int ret;
 702         u8 val[MAX_BANK];
 703
 704         chip->regs = &pca957x_regs;
 705
 706         ret = pca953x_read_regs(chip, chip->regs->output, chip->reg_output);
 707         if (ret)
 708                 goto out;
 709         ret = pca953x_read_regs(chip, chip->regs->direction,
 710                                 chip->reg_direction);
 711         if (ret)
 712                 goto out;
 713
 714         /* set platform specific polarity inversion */
 715         if (invert)
 716                 memset(val, 0xFF, NBANK(chip));
 717         else
 718                 memset(val, 0, NBANK(chip));
 719         ret = pca953x_write_regs(chip, PCA957X_INVRT, val);
 720         if (ret)
 721                 goto out;
 722
 723         /* To enable register 6, 7 to control pull up and pull down */
 724         memset(val, 0x02, NBANK(chip));
 725         ret = pca953x_write_regs(chip, PCA957X_BKEN, val);
 726         if (ret)
 727                 goto out;
 728
 729         return 0;
 730 out:
 731         return ret;
 732 }
 733
 734 static const struct of_device_id pca953x_dt_ids[];
 735
 736 static int pca953x_probe(struct i2c_client *client,
 737                                    const struct i2c_device_id *i2c_id)
 738 {
 739         struct pca953x_platform_data *pdata;
 740         struct pca953x_chip *chip;
 741         int irq_base = 0;
 742         int ret;
 743         u32 invert = 0;
 744         struct regulator *reg;
 745
 746         chip = devm_kzalloc(&client->dev,
 747                         sizeof(struct pca953x_chip), GFP_KERNEL);
 748         if (chip == NULL)
 749                 return -ENOMEM;
 750
 751         pdata = dev_get_platdata(&client->dev);
 752         if (pdata) {
 753                 irq_base = pdata->irq_base;
 754                 chip->gpio_start = pdata->gpio_base;
 755                 invert = pdata->invert;
 756                 chip->names = pdata->names;
 757         } else {
 758                 struct gpio_desc *reset_gpio;
 759
 760                 chip->gpio_start = -1;
 761                 irq_base = 0;
 762
 763                 /* See if we need to de-assert a reset pin */
 764                 reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
 765                                                      GPIOD_OUT_LOW);
 766                 if (IS_ERR(reset_gpio))
 767                         return PTR_ERR(reset_gpio);
 768         }
 769
 770         chip->client = client;
 771
 772         reg = devm_regulator_get(&client->dev, "vcc");
 773         if (IS_ERR(reg)) {
 774                 ret = PTR_ERR(reg);
 775                 if (ret != -EPROBE_DEFER)
 776                         dev_err(&client->dev, "reg get err: %d\n", ret);
 777                 return ret;
 778         }
 779         ret = regulator_enable(reg);
 780         if (ret) {
 781                 dev_err(&client->dev, "reg en err: %d\n", ret);
 782                 return ret;
 783         }
 784         chip->regulator = reg;
 785
 786         if (i2c_id) {
 787                 chip->driver_data = i2c_id->driver_data;
 788         } else {
 789                 const struct acpi_device_id *acpi_id;
 790                 const struct of_device_id *match;
 791
 792                 match = of_match_device(pca953x_dt_ids, &client->dev);
 793                 if (match) {
 794                         chip->driver_data = (int)(uintptr_t)match->data;
 795                 } else {
 796                         acpi_id = acpi_match_device(pca953x_acpi_ids, &client->dev);
 797                         if (!acpi_id) {
 798                                 ret = -ENODEV;
 799                                 goto err_exit;
 800                         }
 801
 802                         chip->driver_data = acpi_id->driver_data;
 803                 }
 804         }
 805
 806         mutex_init(&chip->i2c_lock);
 807         /*
 808          * In case we have an i2c-mux controlled by a GPIO provided by an
 809          * expander using the same driver higher on the device tree, read the
 810          * i2c adapter nesting depth and use the retrieved value as lockdep
 811          * subclass for chip->i2c_lock.
 812          *
 813          * REVISIT: This solution is not complete. It protects us from lockdep
 814          * false positives when the expander controlling the i2c-mux is on
 815          * a different level on the device tree, but not when it's on the same
 816          * level on a different branch (in which case the subclass number
 817          * would be the same).
 818          *
 819          * TODO: Once a correct solution is developed, a similar fix should be
 820          * applied to all other i2c-controlled GPIO expanders (and potentially
 821          * regmap-i2c).
 822          */
 823         lockdep_set_subclass(&chip->i2c_lock,
 824                              i2c_adapter_depth(client->adapter));
 825
 826         /* initialize cached registers from their original values.
 827          * we can't share this chip with another i2c master.
 828          */
 829         pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK);
 830
 831         if (chip->gpio_chip.ngpio <= 8) {
 832                 chip->write_regs = pca953x_write_regs_8;
 833                 chip->read_regs = pca953x_read_regs_8;
 834         } else if (chip->gpio_chip.ngpio >= 24) {
 835                 chip->write_regs = pca953x_write_regs_24;
 836                 chip->read_regs = pca953x_read_regs_24;
 837         } else {
 838                 if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE)
 839                         chip->write_regs = pca953x_write_regs_16;
 840                 else
 841                         chip->write_regs = pca957x_write_regs_16;
 842                 chip->read_regs = pca953x_read_regs_16;
 843         }
 844
 845         if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE)
 846                 ret = device_pca953x_init(chip, invert);
 847         else
 848                 ret = device_pca957x_init(chip, invert);
 849         if (ret)
 850                 goto err_exit;
 851
 852         ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
 853         if (ret)
 854                 goto err_exit;
 855
 856         ret = pca953x_irq_setup(chip, irq_base);
 857         if (ret)
 858                 goto err_exit;
 859
 860         if (pdata && pdata->setup) {
 861                 ret = pdata->setup(client, chip->gpio_chip.base,
 862                                 chip->gpio_chip.ngpio, pdata->context);
 863                 if (ret < 0)
 864                         dev_warn(&client->dev, "setup failed, %d\n", ret);
 865         }
 866
 867         i2c_set_clientdata(client, chip);
 868         return 0;
 869
 870 err_exit:
 871         regulator_disable(chip->regulator);
 872         return ret;
 873 }
 874
 875 static int pca953x_remove(struct i2c_client *client)
 876 {
 877         struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
 878         struct pca953x_chip *chip = i2c_get_clientdata(client);
 879         int ret;
 880
 881         if (pdata && pdata->teardown) {
 882                 ret = pdata->teardown(client, chip->gpio_chip.base,
 883                                 chip->gpio_chip.ngpio, pdata->context);
 884                 if (ret < 0)
 885                         dev_err(&client->dev, "%s failed, %d\n",
 886                                         "teardown", ret);
 887         } else {
 888                 ret = 0;
 889         }
 890
 891         regulator_disable(chip->regulator);
 892
 893         return ret;
 894 }
 895
 896 /* convenience to stop overlong match-table lines */
 897 #define OF_953X(__nrgpio, __int) (void *)(__nrgpio | PCA953X_TYPE | __int)
 898 #define OF_957X(__nrgpio, __int) (void *)(__nrgpio | PCA957X_TYPE | __int)
 899
 900 static const struct of_device_id pca953x_dt_ids[] = {
 901         { .compatible = "nxp,pca9505", .data = OF_953X(40, PCA_INT), },
 902         { .compatible = "nxp,pca9534", .data = OF_953X( 8, PCA_INT), },
 903         { .compatible = "nxp,pca9535", .data = OF_953X(16, PCA_INT), },
 904         { .compatible = "nxp,pca9536", .data = OF_953X( 4, 0), },
 905         { .compatible = "nxp,pca9537", .data = OF_953X( 4, PCA_INT), },
 906         { .compatible = "nxp,pca9538", .data = OF_953X( 8, PCA_INT), },
 907         { .compatible = "nxp,pca9539", .data = OF_953X(16, PCA_INT), },
 908         { .compatible = "nxp,pca9554", .data = OF_953X( 8, PCA_INT), },
 909         { .compatible = "nxp,pca9555", .data = OF_953X(16, PCA_INT), },
 910         { .compatible = "nxp,pca9556", .data = OF_953X( 8, 0), },
 911         { .compatible = "nxp,pca9557", .data = OF_953X( 8, 0), },
 912         { .compatible = "nxp,pca9574", .data = OF_957X( 8, PCA_INT), },
 913         { .compatible = "nxp,pca9575", .data = OF_957X(16, PCA_INT), },
 914         { .compatible = "nxp,pca9698", .data = OF_953X(40, 0), },
 915
 916         { .compatible = "maxim,max7310", .data = OF_953X( 8, 0), },
 917         { .compatible = "maxim,max7312", .data = OF_953X(16, PCA_INT), },
 918         { .compatible = "maxim,max7313", .data = OF_953X(16, PCA_INT), },
 919         { .compatible = "maxim,max7315", .data = OF_953X( 8, PCA_INT), },
 920         { .compatible = "maxim,max7318", .data = OF_953X(16, PCA_INT), },
 921
 922         { .compatible = "ti,pca6107", .data = OF_953X( 8, PCA_INT), },
 923         { .compatible = "ti,pca9536", .data = OF_953X( 4, 0), },
 924         { .compatible = "ti,tca6408", .data = OF_953X( 8, PCA_INT), },
 925         { .compatible = "ti,tca6416", .data = OF_953X(16, PCA_INT), },
 926         { .compatible = "ti,tca6424", .data = OF_953X(24, PCA_INT), },
 927
 928         { .compatible = "onsemi,pca9654", .data = OF_953X( 8, PCA_INT), },
 929
 930         { .compatible = "exar,xra1202", .data = OF_953X( 8, 0), },
 931         { }
 932 };
 933
 934 MODULE_DEVICE_TABLE(of, pca953x_dt_ids);
 935
 936 static struct i2c_driver pca953x_driver = {
 937         .driver = {
 938                 .name   = "pca953x",
 939                 .of_match_table = pca953x_dt_ids,
 940                 .acpi_match_table = ACPI_PTR(pca953x_acpi_ids),
 941         },
 942         .probe          = pca953x_probe,
 943         .remove         = pca953x_remove,
 944         .id_table       = pca953x_id,
 945 };
 946
 947 static int __init pca953x_init(void)
 948 {
 949         return i2c_add_driver(&pca953x_driver);
 950 }
 951 /* register after i2c postcore initcall and before
 952  * subsys initcalls that may rely on these GPIOs
 953  */
 954 subsys_initcall(pca953x_init);
 955
 956 static void __exit pca953x_exit(void)
 957 {
 958         i2c_del_driver(&pca953x_driver);
 959 }
 960 module_exit(pca953x_exit);
 961
 962 MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
 963 MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
 964 MODULE_LICENSE("GPL");