drivers/input/keyboard/lm8323.c

   1 /*
   2  * drivers/i2c/chips/lm8323.c
   3  *
   4  * Copyright (C) 2007 Nokia Corporation
   5  *
   6  * Written by Daniel Stone <daniel.stone@nokia.com>
   7  *            Timo O. Karjalainen <timo.o.karjalainen@nokia.com>
   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 only).
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/i2c.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/sched.h>
  27 #include <linux/mutex.h>
  28 #include <linux/delay.h>
  29 #include <linux/input.h>
  30 #include <linux/leds.h>
  31 #include <linux/i2c/lm8323.h>
  32
  33 #include <asm/mach-types.h>
  34 #include <asm/mach/irq.h>
  35
  36 #ifdef VERBOSE
  37 #define debug dev_dbg
  38 #else
  39 #define debug(...)
  40 #endif
  41
  42 /* Commands to send to the chip. */
  43 #define LM8323_CMD_READ_ID              0x80 /* Read chip ID. */
  44 #define LM8323_CMD_WRITE_CFG            0x81 /* Set configuration item. */
  45 #define LM8323_CMD_READ_INT             0x82 /* Get interrupt status. */
  46 #define LM8323_CMD_RESET                0x83 /* Reset, same as external one */
  47 #define LM8323_CMD_WRITE_PORT_SEL       0x85 /* Set GPIO in/out. */
  48 #define LM8323_CMD_WRITE_PORT_STATE     0x86 /* Set GPIO pullup. */
  49 #define LM8323_CMD_READ_PORT_SEL        0x87 /* Get GPIO in/out. */
  50 #define LM8323_CMD_READ_PORT_STATE      0x88 /* Get GPIO pullup. */
  51 #define LM8323_CMD_READ_FIFO            0x89 /* Read byte from FIFO. */
  52 #define LM8323_CMD_RPT_READ_FIFO        0x8a /* Read FIFO (no increment). */
  53 #define LM8323_CMD_SET_ACTIVE           0x8b /* Set active time. */
  54 #define LM8323_CMD_READ_ERR             0x8c /* Get error status. */
  55 #define LM8323_CMD_READ_ROTATOR         0x8e /* Read rotator status. */
  56 #define LM8323_CMD_SET_DEBOUNCE         0x8f /* Set debouncing time. */
  57 #define LM8323_CMD_SET_KEY_SIZE         0x90 /* Set keypad size. */
  58 #define LM8323_CMD_READ_KEY_SIZE        0x91 /* Get keypad size. */
  59 #define LM8323_CMD_READ_CFG             0x92 /* Get configuration item. */
  60 #define LM8323_CMD_WRITE_CLOCK          0x93 /* Set clock config. */
  61 #define LM8323_CMD_READ_CLOCK           0x94 /* Get clock config. */
  62 #define LM8323_CMD_PWM_WRITE            0x95 /* Write PWM script. */
  63 #define LM8323_CMD_START_PWM            0x96 /* Start PWM engine. */
  64 #define LM8323_CMD_STOP_PWM             0x97 /* Stop PWM engine. */
  65
  66 /* Interrupt status. */
  67 #define INT_KEYPAD                      0x01 /* Key event. */
  68 #define INT_ROTATOR                     0x02 /* Rotator event. */
  69 #define INT_ERROR                       0x08 /* Error: use CMD_READ_ERR. */
  70 #define INT_NOINIT                      0x10 /* Lost configuration. */
  71 #define INT_PWM1                        0x20 /* PWM1 stopped. */
  72 #define INT_PWM2                        0x40 /* PWM2 stopped. */
  73 #define INT_PWM3                        0x80 /* PWM3 stopped. */
  74
  75 /* Errors (signalled by INT_ERROR, read with CMD_READ_ERR). */
  76 #define ERR_BADPAR                      0x01 /* Bad parameter. */
  77 #define ERR_CMDUNK                      0x02 /* Unknown command. */
  78 #define ERR_KEYOVR                      0x04 /* Too many keys pressed. */
  79 #define ERR_FIFOOVER                    0x40 /* FIFO overflow. */
  80
  81 /* Configuration keys (CMD_{WRITE,READ}_CFG). */
  82 #define CFG_MUX1SEL                     0x01 /* Select MUX1_OUT input. */
  83 #define CFG_MUX1EN                      0x02 /* Enable MUX1_OUT. */
  84 #define CFG_MUX2SEL                     0x04 /* Select MUX2_OUT input. */
  85 #define CFG_MUX2EN                      0x08 /* Enable MUX2_OUT. */
  86 #define CFG_PSIZE                       0x20 /* Package size (must be 0). */
  87 #define CFG_ROTEN                       0x40 /* Enable rotator. */
  88
  89 /* Clock settings (CMD_{WRITE,READ}_CLOCK). */
  90 #define CLK_RCPWM_INTERNAL              0x00
  91 #define CLK_RCPWM_EXTERNAL              0x03
  92 #define CLK_SLOWCLKEN                   0x08 /* Enable 32.768kHz clock. */
  93 #define CLK_SLOWCLKOUT                  0x40 /* Enable slow pulse output. */
  94
  95 /* The possible addresses corresponding to CONFIG1 and CONFIG2 pin wirings. */
  96 #define LM8323_I2C_ADDR00               (0x84 >> 1)     /* 1000 010x */
  97 #define LM8323_I2C_ADDR01               (0x86 >> 1)     /* 1000 011x */
  98 #define LM8323_I2C_ADDR10               (0x88 >> 1)     /* 1000 100x */
  99 #define LM8323_I2C_ADDR11               (0x8A >> 1)     /* 1000 101x */
 100
 101 /* Key event fifo length */
 102 #define LM8323_FIFO_LEN                 15
 103
 104 /* Commands for PWM engine; feed in with PWM_WRITE. */
 105 /* Load ramp counter from duty cycle field (range 0 - 0xff). */
 106 #define PWM_SET(v)                      (0x4000 | ((v) & 0xff))
 107 /* Go to start of script. */
 108 #define PWM_GOTOSTART                   0x0000
 109 /*
 110  * Stop engine (generates interrupt).  If reset is 1, clear the program
 111  * counter, else leave it.
 112  */
 113 #define PWM_END(reset)                  (0xc000 | (!!(reset) << 11))
 114 /*
 115  * Ramp.  If s is 1, divide clock by 512, else divide clock by 16.
 116  * Take t clock scales (up to 63) per step, for n steps (up to 126).
 117  * If u is set, ramp up, else ramp down.
 118  */
 119 #define PWM_RAMP(s, t, n, u)            ((!!(s) << 14) | ((t) & 0x3f) << 8 | \
 120                                          ((n) & 0x7f) | ((u) ? 0 : 0x80))
 121 /*
 122  * Loop (i.e. jump back to pos) for a given number of iterations (up to 63).
 123  * If cnt is zero, execute until PWM_END is encountered.
 124  */
 125 #define PWM_LOOP(cnt, pos)              (0xa000 | (((cnt) & 0x3f) << 7) | \
 126                                          ((pos) & 0x3f))
 127 /*
 128  * Wait for trigger.  Argument is a mask of channels, shifted by the channel
 129  * number, e.g. 0xa for channels 3 and 1.  Note that channels are numbered
 130  * from 1, not 0.
 131  */
 132 #define PWM_WAIT_TRIG(chans)            (0xe000 | (((chans) & 0x7) << 6))
 133 /* Send trigger.  Argument is same as PWM_WAIT_TRIG. */
 134 #define PWM_SEND_TRIG(chans)            (0xe000 | ((chans) & 0x7))
 135
 136 #define DRIVER_NAME  "lm8323"
 137
 138 struct lm8323_pwm {
 139         int                     id;
 140         int                     enabled;
 141         int                     fade_time;
 142         int                     brightness;
 143         int                     desired_brightness;
 144         struct work_struct      work;
 145         struct led_classdev     cdev;
 146 };
 147
 148 struct lm8323_chip {
 149         struct mutex            lock;
 150         struct i2c_client       *client;
 151         struct work_struct      work;
 152         struct input_dev        *idev;
 153         unsigned                kp_enabled : 1;
 154         unsigned                pm_suspend : 1;
 155         unsigned                keys_down;
 156         char                    phys[32];
 157         s16                     keymap[LM8323_KEYMAP_SIZE];
 158         int                     size_x;
 159         int                     size_y;
 160         int                     debounce_time;
 161         int                     active_time;
 162         struct lm8323_pwm       pwm1;
 163         struct lm8323_pwm       pwm2;
 164         struct lm8323_pwm       pwm3;
 165 };
 166
 167 #define client_to_lm8323(c)     container_of(c, struct lm8323_chip, client)
 168 #define dev_to_lm8323(d)        container_of(d, struct lm8323_chip, client->dev)
 169 #define work_to_lm8323(w)       container_of(w, struct lm8323_chip, work)
 170 #define cdev_to_pwm(c)          container_of(c, struct lm8323_pwm, cdev)
 171 #define work_to_pwm(w)          container_of(w, struct lm8323_pwm, work)
 172
 173 static struct lm8323_chip *pwm_to_lm8323(struct lm8323_pwm *pwm)
 174 {
 175         switch (pwm->id) {
 176         case 1:
 177                 return container_of(pwm, struct lm8323_chip, pwm1);
 178         case 2:
 179                 return container_of(pwm, struct lm8323_chip, pwm2);
 180         case 3:
 181                 return container_of(pwm, struct lm8323_chip, pwm3);
 182         default:
 183                 return NULL;
 184         }
 185 }
 186
 187 static struct lm8323_platform_data *lm8323_pdata;
 188
 189
 190 #define LM8323_MAX_DATA 8
 191
 192 /*
 193  * To write, we just access the chip's address in write mode, and dump the
 194  * command and data out on the bus.  The command byte and data are taken as
 195  * sequential u8s out of varargs, to a maximum of LM8323_MAX_DATA.
 196  */
 197 static int lm8323_write(struct lm8323_chip *lm, int len, ...)
 198 {
 199         int ret, i;
 200         va_list ap;
 201         u8 data[LM8323_MAX_DATA];
 202
 203         va_start(ap, len);
 204
 205         if (unlikely(len > LM8323_MAX_DATA)) {
 206                 dev_err(&lm->client->dev, "tried to send %d bytes\n", len);
 207                 va_end(ap);
 208                 return 0;
 209         }
 210
 211         for (i = 0; i < len; i++)
 212                 data[i] = va_arg(ap, int);
 213
 214         va_end(ap);
 215
 216         /*
 217          * If the host is asleep while we send the data, we can get a NACK
 218          * back while it wakes up, so try again, once.
 219          */
 220         ret = i2c_master_send(lm->client, data, len);
 221         if (unlikely(ret == -EREMOTEIO))
 222                 ret = i2c_master_send(lm->client, data, len);
 223         if (unlikely(ret != len))
 224                 dev_err(&lm->client->dev, "sent %d bytes of %d total\n",
 225                         len, ret);
 226
 227         return ret;
 228 }
 229
 230 /*
 231  * To read, we first send the command byte to the chip and end the transaction,
 232  * then access the chip in read mode, at which point it will send the data.
 233  */
 234 static int lm8323_read(struct lm8323_chip *lm, u8 cmd, u8 *buf, int len)
 235 {
 236         int ret;
 237
 238         /*
 239          * If the host is asleep while we send the byte, we can get a NACK
 240          * back while it wakes up, so try again, once.
 241          */
 242         ret = i2c_master_send(lm->client, &cmd, 1);
 243         if (unlikely(ret == -EREMOTEIO))
 244                 ret = i2c_master_send(lm->client, &cmd, 1);
 245         if (unlikely(ret != 1)) {
 246                 dev_err(&lm->client->dev, "sending read cmd 0x%02x failed\n",
 247                         cmd);
 248                 return 0;
 249         }
 250
 251         ret = i2c_master_recv(lm->client, buf, len);
 252         if (unlikely(ret != len))
 253                 dev_err(&lm->client->dev, "wanted %d bytes, got %d\n",
 254                         len, ret);
 255
 256         return ret;
 257 }
 258
 259 /*
 260  * Set the chip active time (idle time before it enters halt).
 261  */
 262 static void lm8323_set_active_time(struct lm8323_chip *lm, int time)
 263 {
 264         lm8323_write(lm, 2, LM8323_CMD_SET_ACTIVE, time >> 2);
 265 }
 266
 267 /*
 268  * The signals are AT-style: the low 7 bits are the keycode, and the top
 269  * bit indicates the state (1 for down, 0 for up).
 270  */
 271 static inline u8 lm8323_whichkey(u8 event)
 272 {
 273         return event & 0x7f;
 274 }
 275
 276 static inline int lm8323_ispress(u8 event)
 277 {
 278         return (event & 0x80) ? 1 : 0;
 279 }
 280
 281 static void process_keys(struct lm8323_chip *lm)
 282 {
 283         u8 event;
 284         u8 key_fifo[LM8323_FIFO_LEN + 1];
 285         int old_keys_down = lm->keys_down;
 286         int ret;
 287         int i = 0;
 288
 289         /*
 290          * Read all key events from the FIFO at once. Next READ_FIFO clears the
 291          * FIFO even if we didn't read all events previously.
 292          */
 293         ret = lm8323_read(lm, LM8323_CMD_READ_FIFO, key_fifo, LM8323_FIFO_LEN);
 294
 295         if (ret < 0) {
 296                 dev_err(&lm->client->dev, "Failed reading fifo \n");
 297                 return;
 298         }
 299         key_fifo[ret] = 0;
 300
 301         while ((event = key_fifo[i])) {
 302                 u8 key = lm8323_whichkey(event);
 303                 int isdown = lm8323_ispress(event);
 304                 s16 keycode = lm->keymap[key];
 305
 306                 if (likely(keycode > 0)) {
 307                         debug(&lm->client->dev, "key 0x%02x %s\n", key,
 308                               isdown ? "down" : "up");
 309                         if (likely(lm->kp_enabled)) {
 310                                 input_report_key(lm->idev, keycode, isdown);
 311                                 input_sync(lm->idev);
 312                         }
 313                         if (isdown)
 314                                 lm->keys_down++;
 315                         else
 316                                 lm->keys_down--;
 317                 } else {
 318                         dev_err(&lm->client->dev, "keycode 0x%02x not mapped "
 319                                 "to any key\n", key);
 320                 }
 321                 i++;
 322         }
 323
 324         /*
 325          * Errata: We need to ensure that the chip never enters halt mode
 326          * during a keypress, so set active time to 0.  When it's released,
 327          * we can enter halt again, so set the active time back to normal.
 328          */
 329         if (!old_keys_down && lm->keys_down)
 330                 lm8323_set_active_time(lm, 0);
 331         if (old_keys_down && !lm->keys_down)
 332                 lm8323_set_active_time(lm, lm->active_time);
 333 }
 334
 335 static void lm8323_process_error(struct lm8323_chip *lm)
 336 {
 337         u8 error;
 338
 339         if (lm8323_read(lm, LM8323_CMD_READ_ERR, &error, 1) == 1) {
 340                 if (error & ERR_FIFOOVER)
 341                         debug(&lm->client->dev, "fifo overflow!\n");
 342                 if (error & ERR_KEYOVR)
 343                         debug(&lm->client->dev, "more than two keys pressed\n");
 344                 if (error & ERR_CMDUNK)
 345                         debug(&lm->client->dev, "unknown command submitted\n");
 346                 if (error & ERR_BADPAR)
 347                         debug(&lm->client->dev, "bad command parameter\n");
 348         }
 349 }
 350
 351 static int lm8323_reset(struct lm8323_chip *lm)
 352 {
 353         /* The docs say we must pass 0xAA as the data byte. */
 354         return lm8323_write(lm, 2, LM8323_CMD_RESET, 0xAA);
 355 }
 356
 357 static int lm8323_configure(struct lm8323_chip *lm)
 358 {
 359         int keysize = (lm->size_x << 4) | lm->size_y;
 360         int clock = (CLK_SLOWCLKEN | CLK_RCPWM_EXTERNAL);
 361         int debounce = lm->debounce_time >> 2;
 362         int active = lm->active_time >> 2;
 363         int ret;
 364
 365         /*
 366          * Active time must be greater than the debounce time: if it's
 367          * a close-run thing, give ourselves a 12ms buffer.
 368          */
 369         if (debounce >= active)
 370                 active = debounce + 3;
 371
 372         ret = lm8323_write(lm, 2, LM8323_CMD_WRITE_CFG, 0);
 373         if (ret)
 374                 goto err;
 375         ret = lm8323_write(lm, 2, LM8323_CMD_WRITE_CLOCK, clock);
 376         if (ret)
 377                 goto err;
 378         ret = lm8323_write(lm, 2, LM8323_CMD_SET_KEY_SIZE, keysize);
 379         if (ret)
 380                 goto err;
 381         lm8323_set_active_time(lm, lm->active_time);
 382         ret = lm8323_write(lm, 2, LM8323_CMD_SET_DEBOUNCE, debounce);
 383         if (ret)
 384                 goto err;
 385         ret = lm8323_write(lm, 3, LM8323_CMD_WRITE_PORT_STATE, 0xff, 0xff);
 386         if (ret)
 387                 goto err;
 388         ret = lm8323_write(lm, 3, LM8323_CMD_WRITE_PORT_SEL, 0, 0);
 389         if (ret)
 390                 goto err;
 391
 392         /*
 393          * Not much we can do about errors at this point, so just hope
 394          * for the best.
 395          */
 396
 397         return 0;
 398
 399 err:
 400         dev_err(&lm->client->dev, "failed to configure lm8323\n");
 401
 402         return ret;
 403 }
 404
 405 /*
 406  * Bottom half: handle the interrupt by posting key events, or dealing with
 407  * errors appropriately.
 408  */
 409 static void lm8323_work(struct work_struct *work)
 410 {
 411         struct lm8323_chip *lm = work_to_lm8323(work);
 412         u8 ints;
 413
 414         mutex_lock(&lm->lock);
 415
 416         while ((lm8323_read(lm, LM8323_CMD_READ_INT, &ints, 1) == 1) && ints) {
 417                 if (likely(ints & INT_KEYPAD))
 418                         process_keys(lm);
 419                 if (ints & INT_ROTATOR) {
 420                         /* We don't currently support the rotator. */
 421                         debug(&lm->client->dev, "rotator fired\n");
 422                 }
 423                 if (ints & INT_ERROR) {
 424                         debug(&lm->client->dev, "error!\n");
 425                         lm8323_process_error(lm);
 426                 }
 427                 if (ints & INT_NOINIT) {
 428                         dev_err(&lm->client->dev, "chip lost config; "
 429                                                   "reinitialising\n");
 430                         lm8323_configure(lm);
 431                 }
 432                 if (ints & INT_PWM1)
 433                         debug(&lm->client->dev, "pwm1 engine completed\n");
 434                 if (ints & INT_PWM2)
 435                         debug(&lm->client->dev, "pwm2 engine completed\n");
 436                 if (ints & INT_PWM3)
 437                         debug(&lm->client->dev, "pwm3 engine completed\n");
 438         }
 439
 440         mutex_unlock(&lm->lock);
 441 }
 442
 443 /*
 444  * We cannot use I2C in interrupt context, so we just schedule work.
 445  */
 446 static irqreturn_t lm8323_irq(int irq, void *data)
 447 {
 448         struct lm8323_chip *lm = data;
 449
 450         schedule_work(&lm->work);
 451
 452         return IRQ_HANDLED;
 453 }
 454
 455 /*
 456  * Read the chip ID.
 457  */
 458 static int lm8323_read_id(struct lm8323_chip *lm, u8 *buf)
 459 {
 460         int bytes;
 461
 462         bytes = lm8323_read(lm, LM8323_CMD_READ_ID, buf, 2);
 463         if (unlikely(bytes != 2))
 464                 return -EIO;
 465
 466         return 0;
 467 }
 468
 469 static void lm8323_write_pwm_one(struct lm8323_pwm *pwm, int pos, u16 cmd)
 470 {
 471         struct lm8323_chip *lm = pwm_to_lm8323(pwm);
 472
 473         lm8323_write(lm, 4, LM8323_CMD_PWM_WRITE, (pos << 2) | pwm->id,
 474                      (cmd & 0xff00) >> 8, cmd & 0x00ff);
 475 }
 476
 477 /*
 478  * Write a script into a given PWM engine, concluding with PWM_END.
 479  * If 'keepalive' is specified, the engine will be kept running
 480  * indefinitely.
 481  */
 482 static void lm8323_write_pwm(struct lm8323_pwm *pwm, int keepalive,
 483                              int len, ...)
 484 {
 485         struct lm8323_chip *lm = pwm_to_lm8323(pwm);
 486         int i, cmd;
 487         va_list ap;
 488
 489         /*
 490          * If there are any scripts running at the moment, terminate them
 491          * and make sure the duty cycle is as if it finished.
 492          */
 493         lm8323_write(lm, 2, LM8323_CMD_STOP_PWM, pwm->id);
 494
 495         va_start(ap, len);
 496         for (i = 0; i < len; i++) {
 497                 cmd = va_arg(ap, int);
 498                 lm8323_write_pwm_one(pwm, i, cmd);
 499         }
 500         va_end(ap);
 501
 502         /* Wait for a trigger from any channel. This keeps the engine alive. */
 503         if (keepalive)
 504                 lm8323_write_pwm_one(pwm, i++, PWM_WAIT_TRIG(0xe));
 505         else
 506                 lm8323_write_pwm_one(pwm, i++, PWM_END(1));
 507
 508         lm8323_write(lm, 2, LM8323_CMD_START_PWM, pwm->id);
 509 }
 510
 511 static void lm8323_pwm_work(struct work_struct *work)
 512 {
 513         struct lm8323_pwm *pwm = work_to_pwm(work);
 514         int div, perstep, steps, hz, direction, keepalive;
 515
 516         /* Do nothing if we're already at the requested level. */
 517         if (pwm->desired_brightness == pwm->brightness)
 518                 return;
 519
 520         keepalive = (pwm->desired_brightness > 0);
 521         direction = (pwm->desired_brightness > pwm->brightness);
 522         steps = abs(pwm->desired_brightness - pwm->brightness);
 523
 524         /*
 525          * Convert time (in ms) into a divisor (512 or 16 on a refclk of
 526          * 32768Hz), and number of ticks per step.
 527          */
 528         if ((pwm->fade_time / steps) > (32768 / 512))
 529                 div = 512;
 530         else
 531                 div = 16;
 532
 533         hz = 32768 / div;
 534         if (pwm->fade_time < ((steps * 1000) / hz))
 535                 perstep = 1;
 536         else
 537                 perstep = (hz * pwm->fade_time) / (steps * 1000);
 538
 539         if (perstep == 0)
 540                 perstep = 1;
 541         else if (perstep > 63)
 542                 perstep = 63;
 543
 544         if (steps > 252) {
 545                 lm8323_write_pwm(pwm, keepalive, 3,
 546                                  PWM_RAMP((div == 512), perstep, 126,
 547                                           direction),
 548                                  PWM_RAMP((div == 512), perstep, 126,
 549                                           direction),
 550                                  PWM_RAMP((div == 512), perstep, steps - 252,
 551                                           direction));
 552         } else if (steps > 126) {
 553                 lm8323_write_pwm(pwm, keepalive, 2,
 554                                  PWM_RAMP((div == 512), perstep, 126,
 555                                           direction),
 556                                  PWM_RAMP((div == 512), perstep, steps - 126,
 557                                           direction));
 558         } else {
 559                 lm8323_write_pwm(pwm, keepalive, 1,
 560                                  PWM_RAMP((div == 512), perstep, steps,
 561                                           direction));
 562         }
 563
 564         pwm->brightness = pwm->desired_brightness;
 565 }
 566
 567 static void lm8323_pwm_set_brightness(struct led_classdev *led_cdev,
 568                                       enum led_brightness brightness)
 569 {
 570         struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);
 571         struct lm8323_chip *lm = pwm_to_lm8323(pwm);
 572
 573         pwm->desired_brightness = brightness;
 574
 575         if (in_interrupt()) {
 576                 schedule_work(&pwm->work);
 577         } else {
 578                 /*
 579                  * Schedule PWM work as usual unless we are going into suspend
 580                  */
 581                 mutex_lock(&lm->lock);
 582                 if (likely(!lm->pm_suspend))
 583                         schedule_work(&pwm->work);
 584                 else
 585                         lm8323_pwm_work(&pwm->work);
 586                 mutex_unlock(&lm->lock);
 587         }
 588 }
 589
 590 static ssize_t lm8323_pwm_show_time(struct device *dev,
 591                 struct device_attribute *attr, char *buf)
 592 {
 593         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 594         struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);
 595
 596         return sprintf(buf, "%d\n", pwm->fade_time);
 597 }
 598
 599 static ssize_t lm8323_pwm_store_time(struct device *dev,
 600                 struct device_attribute *attr, const char *buf, size_t len)
 601 {
 602         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 603         struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);
 604         int ret;
 605         int time;
 606
 607         ret = sscanf(buf, "%d", &time);
 608         /* Numbers only, please. */
 609         if (ret)
 610                 return -EINVAL;
 611
 612         pwm->fade_time = time;
 613
 614         return strlen(buf);
 615 }
 616 static DEVICE_ATTR(time, 0644, lm8323_pwm_show_time, lm8323_pwm_store_time);
 617
 618 static int init_pwm(struct lm8323_chip *lm, int id, struct device *dev,
 619                     const char *name)
 620 {
 621         struct lm8323_pwm *pwm = NULL;
 622
 623         BUG_ON(id > 3);
 624
 625         switch (id) {
 626         case 1:
 627                 pwm = &lm->pwm1;
 628                 break;
 629         case 2:
 630                 pwm = &lm->pwm2;
 631                 break;
 632         case 3:
 633                 pwm = &lm->pwm3;
 634                 break;
 635         }
 636
 637         pwm->id = id;
 638         pwm->fade_time = 0;
 639         pwm->brightness = 0;
 640         pwm->desired_brightness = 0;
 641         if (name) {
 642                 pwm->cdev.name = name;
 643                 pwm->cdev.brightness_set = lm8323_pwm_set_brightness;
 644                 if (led_classdev_register(dev, &pwm->cdev) < 0) {
 645                         dev_err(dev, "couldn't register PWM %d\n", id);
 646                         return -1;
 647                 }
 648                 if (device_create_file(pwm->cdev.dev,
 649                                              &dev_attr_time) < 0) {
 650                         dev_err(dev, "couldn't register time attribute\n");
 651                         led_classdev_unregister(&pwm->cdev);
 652                         return -1;
 653                 }
 654                 INIT_WORK(&pwm->work, lm8323_pwm_work);
 655                 pwm->enabled = 1;
 656         } else {
 657                 pwm->enabled = 0;
 658         }
 659
 660         return 0;
 661 }
 662
 663 static struct i2c_driver lm8323_i2c_driver;
 664
 665 static ssize_t lm8323_show_disable(struct device *dev,
 666                                    struct device_attribute *attr, char *buf)
 667 {
 668         struct lm8323_chip *lm = dev_get_drvdata(dev);
 669
 670         return sprintf(buf, "%u\n", !lm->kp_enabled);
 671 }
 672
 673 static ssize_t lm8323_set_disable(struct device *dev,
 674                                   struct device_attribute *attr,
 675                                   const char *buf, size_t count)
 676 {
 677         struct lm8323_chip *lm = dev_get_drvdata(dev);
 678         int ret;
 679         int i;
 680
 681         i = sscanf(buf, "%d", &ret);
 682
 683         mutex_lock(&lm->lock);
 684         lm->kp_enabled = !i;
 685         mutex_unlock(&lm->lock);
 686
 687         return count;
 688 }
 689 static DEVICE_ATTR(disable_kp, 0644, lm8323_show_disable, lm8323_set_disable);
 690
 691 static int lm8323_probe(struct i2c_client *client,
 692                                         const struct i2c_device_id *id)
 693 {
 694         struct input_dev *idev;
 695         struct lm8323_chip *lm;
 696         int i, err = 0;
 697         unsigned long tmo;
 698         u8 data[2];
 699
 700         lm = kzalloc(sizeof *lm, GFP_KERNEL);
 701         if (!lm)
 702                 return -ENOMEM;
 703
 704         i2c_set_clientdata(client, lm);
 705         lm->client = client;
 706         lm8323_pdata = client->dev.platform_data;
 707         if (!lm8323_pdata)
 708                 return -EINVAL; /* ? */
 709
 710         lm->size_x = lm8323_pdata->size_x;
 711         if (lm->size_x == 0) {
 712                 lm->size_x = 8;
 713         } else if (lm->size_x > 8) {
 714                 dev_err(&client->dev, "invalid x size %d specified\n",
 715                                 lm->size_x);
 716                 lm->size_x = 8;
 717         }
 718
 719         lm->size_y = lm8323_pdata->size_y;
 720         if (lm->size_y == 0) {
 721                 lm->size_y = 12;
 722         } else if (lm->size_y > 12) {
 723                 dev_err(&client->dev, "invalid y size %d specified\n",
 724                                 lm->size_y);
 725                 lm->size_x = 12;
 726         }
 727
 728         debug(&c->dev, "Keypad size: %d x %d\n", lm->size_x, lm->size_y);
 729
 730         lm->debounce_time = lm8323_pdata->debounce_time;
 731         if (lm->debounce_time == 0) /* Default. */
 732                 lm->debounce_time = 12;
 733         else if (lm->debounce_time == -1) /* Disable debounce. */
 734                 lm->debounce_time = 0;
 735
 736         lm->active_time = lm8323_pdata->active_time;
 737         if (lm->active_time == 0) /* Default. */
 738                 lm->active_time = 500;
 739         else if (lm->active_time == -1) /* Disable sleep. */
 740                 lm->active_time = 0;
 741
 742         err = lm8323_reset(lm);
 743         if (err)
 744                 goto fail2;
 745
 746         /* Nothing's set up to service the IRQ yet, so just spin for max.
 747          * 100ms until we can configure. */
 748         tmo = jiffies + msecs_to_jiffies(100);
 749         while (lm8323_read(lm, LM8323_CMD_READ_INT, data, 1) == 1) {
 750                 if (data[0] & INT_NOINIT)
 751                         break;
 752
 753                 if (time_after(jiffies, tmo)) {
 754                         dev_err(&client->dev,
 755                                         "timeout waiting for initialisation\n");
 756                         break;
 757                 }
 758
 759                 msleep(1);
 760         }
 761         err = lm8323_configure(lm);
 762         if (err)
 763                 goto fail2;
 764
 765         /* If a true probe check the device */
 766         if (lm8323_read_id(lm, data) != 0) {
 767                 dev_err(&client->dev, "device not found\n");
 768                 err = -ENODEV;
 769                 goto fail2;
 770         }
 771
 772         if (init_pwm(lm, 1, &client->dev, lm8323_pdata->pwm1_name) < 0)
 773                 goto fail3;
 774         if (init_pwm(lm, 2, &client->dev, lm8323_pdata->pwm2_name) < 0)
 775                 goto fail4;
 776         if (init_pwm(lm, 3, &client->dev, lm8323_pdata->pwm3_name) < 0)
 777                 goto fail5;
 778
 779         mutex_init(&lm->lock);
 780         INIT_WORK(&lm->work, lm8323_work);
 781
 782         err = request_irq(client->irq, lm8323_irq,
 783                           IRQF_TRIGGER_FALLING | IRQF_DISABLED |
 784                           IRQF_SAMPLE_RANDOM, DRIVER_NAME, lm);
 785         if (err) {
 786                 dev_err(&client->dev, "could not get IRQ %d\n", client->irq);
 787                 goto fail6;
 788         }
 789
 790         set_irq_wake(client->irq, 1);
 791
 792         lm->kp_enabled = 1;
 793         err = device_create_file(&client->dev, &dev_attr_disable_kp);
 794         if (err < 0)
 795                 goto fail7;
 796
 797         idev = input_allocate_device();
 798         if (idev == NULL) {
 799                 err = -ENOMEM;
 800                 goto fail8;
 801         }
 802
 803         if (lm8323_pdata->name)
 804                 idev->name = lm8323_pdata->name;
 805         else
 806                 idev->name = "LM8323 keypad";
 807         snprintf(lm->phys, sizeof(lm->phys), "%s/input-kp", client->dev.bus_id);
 808         idev->phys = lm->phys;
 809
 810         lm->keys_down = 0;
 811         idev->evbit[0] = BIT(EV_KEY);
 812         for (i = 0; i < LM8323_KEYMAP_SIZE; i++) {
 813                 if (lm8323_pdata->keymap[i] > 0)
 814                         set_bit(lm8323_pdata->keymap[i], idev->keybit);
 815
 816                 lm->keymap[i] = lm8323_pdata->keymap[i];
 817         }
 818
 819         if (lm8323_pdata->repeat)
 820                 set_bit(EV_REP, idev->evbit);
 821
 822         lm->idev = idev;
 823         err = input_register_device(idev);
 824         if (err) {
 825                 dev_dbg(&client->dev, "error registering input device\n");
 826                 goto fail8;
 827         }
 828
 829         return 0;
 830
 831 fail8:
 832         device_remove_file(&client->dev, &dev_attr_disable_kp);
 833 fail7:
 834         free_irq(client->irq, lm);
 835 fail6:
 836         if (lm->pwm3.enabled)
 837                 led_classdev_unregister(&lm->pwm3.cdev);
 838 fail5:
 839         if (lm->pwm2.enabled)
 840                 led_classdev_unregister(&lm->pwm2.cdev);
 841 fail4:
 842         if (lm->pwm1.enabled)
 843                 led_classdev_unregister(&lm->pwm1.cdev);
 844 fail3:
 845 fail2:
 846         kfree(lm);
 847         return err;
 848 }
 849
 850 static int lm8323_remove(struct i2c_client *client)
 851 {
 852         struct lm8323_chip *lm = i2c_get_clientdata(client);
 853
 854         free_irq(client->irq, lm);
 855         cancel_work_sync(&lm->work);
 856         input_unregister_device(lm->idev);
 857         device_remove_file(&lm->client->dev, &dev_attr_disable_kp);
 858         if (lm->pwm3.enabled)
 859                 led_classdev_unregister(&lm->pwm3.cdev);
 860         if (lm->pwm2.enabled)
 861                 led_classdev_unregister(&lm->pwm2.cdev);
 862         if (lm->pwm1.enabled)
 863                 led_classdev_unregister(&lm->pwm1.cdev);
 864         kfree(lm);
 865
 866         return 0;
 867 }
 868
 869 /*
 870  * We don't need to explicitly suspend the chip, as it already switches off
 871  * when there's no activity.
 872  */
 873 static int lm8323_suspend(struct i2c_client *client, pm_message_t mesg)
 874 {
 875         struct lm8323_chip *lm = i2c_get_clientdata(client);
 876
 877         set_irq_wake(client->irq, 0);
 878         disable_irq(client->irq);
 879
 880         mutex_lock(&lm->lock);
 881         lm->pm_suspend = 1;
 882         mutex_unlock(&lm->lock);
 883
 884         if (lm->pwm1.enabled)
 885                 led_classdev_suspend(&lm->pwm1.cdev);
 886         if (lm->pwm2.enabled)
 887                 led_classdev_suspend(&lm->pwm2.cdev);
 888         if (lm->pwm3.enabled)
 889                 led_classdev_suspend(&lm->pwm3.cdev);
 890
 891         return 0;
 892 }
 893
 894 static int lm8323_resume(struct i2c_client *client)
 895 {
 896         struct lm8323_chip *lm = i2c_get_clientdata(client);
 897
 898         mutex_lock(&lm->lock);
 899         lm->pm_suspend = 0;
 900         mutex_unlock(&lm->lock);
 901
 902         if (lm->pwm1.enabled)
 903                 led_classdev_resume(&lm->pwm1.cdev);
 904         if (lm->pwm2.enabled)
 905                 led_classdev_resume(&lm->pwm2.cdev);
 906         if (lm->pwm3.enabled)
 907                 led_classdev_resume(&lm->pwm3.cdev);
 908
 909         enable_irq(client->irq);
 910         set_irq_wake(client->irq, 1);
 911
 912         return 0;
 913 }
 914
 915 static const struct i2c_device_id lm8323_id[] = {
 916         { DRIVER_NAME, 0 },
 917         { }
 918 };
 919
 920 static struct i2c_driver lm8323_i2c_driver = {
 921         .driver = {
 922                 .name    = DRIVER_NAME,
 923         },
 924         .probe          = lm8323_probe,
 925         .remove         = __devexit_p(lm8323_remove),
 926         .suspend        = lm8323_suspend,
 927         .resume         = lm8323_resume,
 928         .id_table       = lm8323_id,
 929 };
 930 MODULE_DEVICE_TABLE(i2c, lm8323_id);
 931
 932 static int __init lm8323_init(void)
 933 {
 934         return i2c_add_driver(&lm8323_i2c_driver);
 935 }
 936
 937 static void __exit lm8323_exit(void)
 938 {
 939         i2c_del_driver(&lm8323_i2c_driver);
 940 }
 941
 942 MODULE_AUTHOR("Daniel Stone");
 943 MODULE_DESCRIPTION("LM8323 keypad driver");
 944 MODULE_LICENSE("GPL");
 945
 946 module_init(lm8323_init);
 947 module_exit(lm8323_exit);