drivers/input/keyboard/lm8323.c

   1 /*
   2  * drivers/i2c/chips/lm8323.c
   3  *
   4  * Copyright (C) 2007-2009 Nokia Corporation
   5  *
   6  * Written by Daniel Stone <daniel.stone@nokia.com>
   7  *            Timo O. Karjalainen <timo.o.karjalainen@nokia.com>
   8  *
   9  * Updated by Felipe Balbi <felipe.balbi@nokia.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation (version 2 of the License only).
  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/module.h>
  26 #include <linux/i2c.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/sched.h>
  29 #include <linux/mutex.h>
  30 #include <linux/delay.h>
  31 #include <linux/input.h>
  32 #include <linux/leds.h>
  33 #include <linux/i2c/lm8323.h>
  34
  35 /* Commands to send to the chip. */
  36 #define LM8323_CMD_READ_ID              0x80 /* Read chip ID. */
  37 #define LM8323_CMD_WRITE_CFG            0x81 /* Set configuration item. */
  38 #define LM8323_CMD_READ_INT             0x82 /* Get interrupt status. */
  39 #define LM8323_CMD_RESET                0x83 /* Reset, same as external one */
  40 #define LM8323_CMD_WRITE_PORT_SEL       0x85 /* Set GPIO in/out. */
  41 #define LM8323_CMD_WRITE_PORT_STATE     0x86 /* Set GPIO pullup. */
  42 #define LM8323_CMD_READ_PORT_SEL        0x87 /* Get GPIO in/out. */
  43 #define LM8323_CMD_READ_PORT_STATE      0x88 /* Get GPIO pullup. */
  44 #define LM8323_CMD_READ_FIFO            0x89 /* Read byte from FIFO. */
  45 #define LM8323_CMD_RPT_READ_FIFO        0x8a /* Read FIFO (no increment). */
  46 #define LM8323_CMD_SET_ACTIVE           0x8b /* Set active time. */
  47 #define LM8323_CMD_READ_ERR             0x8c /* Get error status. */
  48 #define LM8323_CMD_READ_ROTATOR         0x8e /* Read rotator status. */
  49 #define LM8323_CMD_SET_DEBOUNCE         0x8f /* Set debouncing time. */
  50 #define LM8323_CMD_SET_KEY_SIZE         0x90 /* Set keypad size. */
  51 #define LM8323_CMD_READ_KEY_SIZE        0x91 /* Get keypad size. */
  52 #define LM8323_CMD_READ_CFG             0x92 /* Get configuration item. */
  53 #define LM8323_CMD_WRITE_CLOCK          0x93 /* Set clock config. */
  54 #define LM8323_CMD_READ_CLOCK           0x94 /* Get clock config. */
  55 #define LM8323_CMD_PWM_WRITE            0x95 /* Write PWM script. */
  56 #define LM8323_CMD_START_PWM            0x96 /* Start PWM engine. */
  57 #define LM8323_CMD_STOP_PWM             0x97 /* Stop PWM engine. */
  58
  59 /* Interrupt status. */
  60 #define INT_KEYPAD                      0x01 /* Key event. */
  61 #define INT_ROTATOR                     0x02 /* Rotator event. */
  62 #define INT_ERROR                       0x08 /* Error: use CMD_READ_ERR. */
  63 #define INT_NOINIT                      0x10 /* Lost configuration. */
  64 #define INT_PWM1                        0x20 /* PWM1 stopped. */
  65 #define INT_PWM2                        0x40 /* PWM2 stopped. */
  66 #define INT_PWM3                        0x80 /* PWM3 stopped. */
  67
  68 /* Errors (signalled by INT_ERROR, read with CMD_READ_ERR). */
  69 #define ERR_BADPAR                      0x01 /* Bad parameter. */
  70 #define ERR_CMDUNK                      0x02 /* Unknown command. */
  71 #define ERR_KEYOVR                      0x04 /* Too many keys pressed. */
  72 #define ERR_FIFOOVER                    0x40 /* FIFO overflow. */
  73
  74 /* Configuration keys (CMD_{WRITE,READ}_CFG). */
  75 #define CFG_MUX1SEL                     0x01 /* Select MUX1_OUT input. */
  76 #define CFG_MUX1EN                      0x02 /* Enable MUX1_OUT. */
  77 #define CFG_MUX2SEL                     0x04 /* Select MUX2_OUT input. */
  78 #define CFG_MUX2EN                      0x08 /* Enable MUX2_OUT. */
  79 #define CFG_PSIZE                       0x20 /* Package size (must be 0). */
  80 #define CFG_ROTEN                       0x40 /* Enable rotator. */
  81
  82 /* Clock settings (CMD_{WRITE,READ}_CLOCK). */
  83 #define CLK_RCPWM_INTERNAL              0x00
  84 #define CLK_RCPWM_EXTERNAL              0x03
  85 #define CLK_SLOWCLKEN                   0x08 /* Enable 32.768kHz clock. */
  86 #define CLK_SLOWCLKOUT                  0x40 /* Enable slow pulse output. */
  87
  88 /* The possible addresses corresponding to CONFIG1 and CONFIG2 pin wirings. */
  89 #define LM8323_I2C_ADDR00               (0x84 >> 1)     /* 1000 010x */
  90 #define LM8323_I2C_ADDR01               (0x86 >> 1)     /* 1000 011x */
  91 #define LM8323_I2C_ADDR10               (0x88 >> 1)     /* 1000 100x */
  92 #define LM8323_I2C_ADDR11               (0x8A >> 1)     /* 1000 101x */
  93
  94 /* Key event fifo length */
  95 #define LM8323_FIFO_LEN                 15
  96
  97 /* Commands for PWM engine; feed in with PWM_WRITE. */
  98 /* Load ramp counter from duty cycle field (range 0 - 0xff). */
  99 #define PWM_SET(v)                      (0x4000 | ((v) & 0xff))
 100 /* Go to start of script. */
 101 #define PWM_GOTOSTART                   0x0000
 102 /*
 103  * Stop engine (generates interrupt).  If reset is 1, clear the program
 104  * counter, else leave it.
 105  */
 106 #define PWM_END(reset)                  (0xc000 | (!!(reset) << 11))
 107 /*
 108  * Ramp.  If s is 1, divide clock by 512, else divide clock by 16.
 109  * Take t clock scales (up to 63) per step, for n steps (up to 126).
 110  * If u is set, ramp up, else ramp down.
 111  */
 112 #define PWM_RAMP(s, t, n, u)            ((!!(s) << 14) | ((t) & 0x3f) << 8 | \
 113                                          ((n) & 0x7f) | ((u) ? 0 : 0x80))
 114 /*
 115  * Loop (i.e. jump back to pos) for a given number of iterations (up to 63).
 116  * If cnt is zero, execute until PWM_END is encountered.
 117  */
 118 #define PWM_LOOP(cnt, pos)              (0xa000 | (((cnt) & 0x3f) << 7) | \
 119                                          ((pos) & 0x3f))
 120 /*
 121  * Wait for trigger.  Argument is a mask of channels, shifted by the channel
 122  * number, e.g. 0xa for channels 3 and 1.  Note that channels are numbered
 123  * from 1, not 0.
 124  */
 125 #define PWM_WAIT_TRIG(chans)            (0xe000 | (((chans) & 0x7) << 6))
 126 /* Send trigger.  Argument is same as PWM_WAIT_TRIG. */
 127 #define PWM_SEND_TRIG(chans)            (0xe000 | ((chans) & 0x7))
 128
 129 struct lm8323_pwm {
 130         int                     id;
 131         int                     enabled;
 132         int                     fade_time;
 133         int                     brightness;
 134         int                     desired_brightness;
 135         int                     running;
 136         /* pwm lock */
 137         struct mutex            lock;
 138         struct work_struct      work;
 139         struct led_classdev     cdev;
 140 };
 141
 142 struct lm8323_chip {
 143         /* device lock */
 144         struct mutex            lock;
 145         struct i2c_client       *client;
 146         struct work_struct      work;
 147         struct input_dev        *idev;
 148         unsigned                kp_enabled:1;
 149         unsigned                pm_suspend:1;
 150         unsigned                keys_down;
 151         char                    phys[32];
 152         s16                     keymap[LM8323_KEYMAP_SIZE];
 153         int                     size_x;
 154         int                     size_y;
 155         int                     debounce_time;
 156         int                     active_time;
 157         struct lm8323_pwm       pwm1;
 158         struct lm8323_pwm       pwm2;
 159         struct lm8323_pwm       pwm3;
 160 };
 161
 162 #define client_to_lm8323(c)     container_of(c, struct lm8323_chip, client)
 163 #define dev_to_lm8323(d)        container_of(d, struct lm8323_chip, client->dev)
 164 #define work_to_lm8323(w)       container_of(w, struct lm8323_chip, work)
 165 #define cdev_to_pwm(c)          container_of(c, struct lm8323_pwm, cdev)
 166 #define work_to_pwm(w)          container_of(w, struct lm8323_pwm, work)
 167
 168 static struct lm8323_chip *pwm_to_lm8323(struct lm8323_pwm *pwm)
 169 {
 170         switch (pwm->id) {
 171         case 1:
 172                 return container_of(pwm, struct lm8323_chip, pwm1);
 173         case 2:
 174                 return container_of(pwm, struct lm8323_chip, pwm2);
 175         case 3:
 176                 return container_of(pwm, struct lm8323_chip, pwm3);
 177         default:
 178                 return NULL;
 179         }
 180 }
 181
 182 #define LM8323_MAX_DATA 8
 183
 184 /*
 185  * To write, we just access the chip's address in write mode, and dump the
 186  * command and data out on the bus.  The command byte and data are taken as
 187  * sequential u8s out of varargs, to a maximum of LM8323_MAX_DATA.
 188  */
 189 static int lm8323_write(struct lm8323_chip *lm, int len, ...)
 190 {
 191         int ret, i;
 192         va_list ap;
 193         u8 data[LM8323_MAX_DATA];
 194
 195         va_start(ap, len);
 196
 197         if (unlikely(len > LM8323_MAX_DATA)) {
 198                 dev_err(&lm->client->dev, "tried to send %d bytes\n", len);
 199                 va_end(ap);
 200                 return 0;
 201         }
 202
 203         for (i = 0; i < len; i++)
 204                 data[i] = va_arg(ap, int);
 205
 206         va_end(ap);
 207
 208         /*
 209          * If the host is asleep while we send the data, we can get a NACK
 210          * back while it wakes up, so try again, once.
 211          */
 212         ret = i2c_master_send(lm->client, data, len);
 213         if (unlikely(ret == -EREMOTEIO))
 214                 ret = i2c_master_send(lm->client, data, len);
 215         if (unlikely(ret != len))
 216                 dev_err(&lm->client->dev, "sent %d bytes of %d total\n",
 217                         len, ret);
 218
 219         return ret;
 220 }
 221
 222 /*
 223  * To read, we first send the command byte to the chip and end the transaction,
 224  * then access the chip in read mode, at which point it will send the data.
 225  */
 226 static int lm8323_read(struct lm8323_chip *lm, u8 cmd, u8 *buf, int len)
 227 {
 228         int ret;
 229
 230         /*
 231          * If the host is asleep while we send the byte, we can get a NACK
 232          * back while it wakes up, so try again, once.
 233          */
 234         ret = i2c_master_send(lm->client, &cmd, 1);
 235         if (unlikely(ret == -EREMOTEIO))
 236                 ret = i2c_master_send(lm->client, &cmd, 1);
 237         if (unlikely(ret != 1)) {
 238                 dev_err(&lm->client->dev, "sending read cmd 0x%02x failed\n",
 239                         cmd);
 240                 return 0;
 241         }
 242
 243         ret = i2c_master_recv(lm->client, buf, len);
 244         if (unlikely(ret != len))
 245                 dev_err(&lm->client->dev, "wanted %d bytes, got %d\n",
 246                         len, ret);
 247
 248         return ret;
 249 }
 250
 251 /*
 252  * Set the chip active time (idle time before it enters halt).
 253  */
 254 static void lm8323_set_active_time(struct lm8323_chip *lm, int time)
 255 {
 256         lm8323_write(lm, 2, LM8323_CMD_SET_ACTIVE, time >> 2);
 257 }
 258
 259 /*
 260  * The signals are AT-style: the low 7 bits are the keycode, and the top
 261  * bit indicates the state (1 for down, 0 for up).
 262  */
 263 static inline u8 lm8323_whichkey(u8 event)
 264 {
 265         return event & 0x7f;
 266 }
 267
 268 static inline int lm8323_ispress(u8 event)
 269 {
 270         return (event & 0x80) ? 1 : 0;
 271 }
 272
 273 static void process_keys(struct lm8323_chip *lm)
 274 {
 275         u8 event;
 276         u8 key_fifo[LM8323_FIFO_LEN + 1];
 277         int old_keys_down = lm->keys_down;
 278         int ret;
 279         int i = 0;
 280
 281         /*
 282          * Read all key events from the FIFO at once. Next READ_FIFO clears the
 283          * FIFO even if we didn't read all events previously.
 284          */
 285         ret = lm8323_read(lm, LM8323_CMD_READ_FIFO, key_fifo, LM8323_FIFO_LEN);
 286
 287         if (ret < 0) {
 288                 dev_err(&lm->client->dev, "Failed reading fifo \n");
 289                 return;
 290         }
 291         key_fifo[ret] = 0;
 292
 293         while ((event = key_fifo[i])) {
 294                 u8 key = lm8323_whichkey(event);
 295                 int isdown = lm8323_ispress(event);
 296                 s16 keycode = lm->keymap[key];
 297
 298                 if (likely(keycode > 0)) {
 299                         dev_vdbg(&lm->client->dev, "key 0x%02x %s\n", key,
 300                               isdown ? "down" : "up");
 301                         if (likely(lm->kp_enabled)) {
 302                                 input_report_key(lm->idev, keycode, isdown);
 303                                 input_sync(lm->idev);
 304                         }
 305                         if (isdown)
 306                                 lm->keys_down++;
 307                         else
 308                                 lm->keys_down--;
 309                 } else {
 310                         dev_err(&lm->client->dev, "keycode 0x%02x not mapped "
 311                                 "to any key\n", key);
 312                 }
 313                 i++;
 314         }
 315
 316         /*
 317          * Errata: We need to ensure that the chip never enters halt mode
 318          * during a keypress, so set active time to 0.  When it's released,
 319          * we can enter halt again, so set the active time back to normal.
 320          */
 321         if (!old_keys_down && lm->keys_down)
 322                 lm8323_set_active_time(lm, 0);
 323         if (old_keys_down && !lm->keys_down)
 324                 lm8323_set_active_time(lm, lm->active_time);
 325 }
 326
 327 static void lm8323_process_error(struct lm8323_chip *lm)
 328 {
 329         u8 error;
 330
 331         if (lm8323_read(lm, LM8323_CMD_READ_ERR, &error, 1) == 1) {
 332                 if (error & ERR_FIFOOVER)
 333                         dev_vdbg(&lm->client->dev, "fifo overflow!\n");
 334                 if (error & ERR_KEYOVR)
 335                         dev_vdbg(&lm->client->dev,
 336                                         "more than two keys pressed\n");
 337                 if (error & ERR_CMDUNK)
 338                         dev_vdbg(&lm->client->dev,
 339                                         "unknown command submitted\n");
 340                 if (error & ERR_BADPAR)
 341                         dev_vdbg(&lm->client->dev, "bad command parameter\n");
 342         }
 343 }
 344
 345 static void lm8323_reset(struct lm8323_chip *lm)
 346 {
 347         /* The docs say we must pass 0xAA as the data byte. */
 348         lm8323_write(lm, 2, LM8323_CMD_RESET, 0xAA);
 349 }
 350
 351 static int lm8323_configure(struct lm8323_chip *lm)
 352 {
 353         int keysize = (lm->size_x << 4) | lm->size_y;
 354         int clock = (CLK_SLOWCLKEN | CLK_RCPWM_EXTERNAL);
 355         int debounce = lm->debounce_time >> 2;
 356         int active = lm->active_time >> 2;
 357
 358         /*
 359          * Active time must be greater than the debounce time: if it's
 360          * a close-run thing, give ourselves a 12ms buffer.
 361          */
 362         if (debounce >= active)
 363                 active = debounce + 3;
 364
 365         lm8323_write(lm, 2, LM8323_CMD_WRITE_CFG, 0);
 366         lm8323_write(lm, 2, LM8323_CMD_WRITE_CLOCK, clock);
 367         lm8323_write(lm, 2, LM8323_CMD_SET_KEY_SIZE, keysize);
 368         lm8323_set_active_time(lm, lm->active_time);
 369         lm8323_write(lm, 2, LM8323_CMD_SET_DEBOUNCE, debounce);
 370         lm8323_write(lm, 3, LM8323_CMD_WRITE_PORT_STATE, 0xff, 0xff);
 371         lm8323_write(lm, 3, LM8323_CMD_WRITE_PORT_SEL, 0, 0);
 372
 373         /*
 374          * Not much we can do about errors at this point, so just hope
 375          * for the best.
 376          */
 377
 378         return 0;
 379 }
 380
 381 static void pwm_done(struct lm8323_pwm *pwm)
 382 {
 383         mutex_lock(&pwm->lock);
 384         pwm->running = 0;
 385         if (pwm->desired_brightness != pwm->brightness)
 386                 schedule_work(&pwm->work);
 387         mutex_unlock(&pwm->lock);
 388 }
 389
 390 /*
 391  * Bottom half: handle the interrupt by posting key events, or dealing with
 392  * errors appropriately.
 393  */
 394 static void lm8323_work(struct work_struct *work)
 395 {
 396         struct lm8323_chip *lm = work_to_lm8323(work);
 397         u8 ints;
 398
 399         mutex_lock(&lm->lock);
 400
 401         while ((lm8323_read(lm, LM8323_CMD_READ_INT, &ints, 1) == 1) && ints) {
 402                 if (likely(ints & INT_KEYPAD))
 403                         process_keys(lm);
 404                 if (ints & INT_ROTATOR) {
 405                         /* We don't currently support the rotator. */
 406                         dev_vdbg(&lm->client->dev, "rotator fired\n");
 407                 }
 408                 if (ints & INT_ERROR) {
 409                         dev_vdbg(&lm->client->dev, "error!\n");
 410                         lm8323_process_error(lm);
 411                 }
 412                 if (ints & INT_NOINIT) {
 413                         dev_err(&lm->client->dev, "chip lost config; "
 414                                                   "reinitialising\n");
 415                         lm8323_configure(lm);
 416                 }
 417                 if (ints & INT_PWM1) {
 418                         dev_vdbg(&lm->client->dev, "pwm1 engine completed\n");
 419                         pwm_done(&lm->pwm1);
 420                 }
 421                 if (ints & INT_PWM2) {
 422                         dev_vdbg(&lm->client->dev, "pwm2 engine completed\n");
 423                         pwm_done(&lm->pwm2);
 424                 }
 425                 if (ints & INT_PWM3) {
 426                         dev_vdbg(&lm->client->dev, "pwm3 engine completed\n");
 427                         pwm_done(&lm->pwm3);
 428                 }
 429         }
 430
 431         mutex_unlock(&lm->lock);
 432 }
 433
 434 /*
 435  * We cannot use I2C in interrupt context, so we just schedule work.
 436  */
 437 static irqreturn_t lm8323_irq(int irq, void *data)
 438 {
 439         struct lm8323_chip *lm = data;
 440
 441         schedule_work(&lm->work);
 442
 443         return IRQ_HANDLED;
 444 }
 445
 446 /*
 447  * Read the chip ID.
 448  */
 449 static int lm8323_read_id(struct lm8323_chip *lm, u8 *buf)
 450 {
 451         int bytes;
 452
 453         bytes = lm8323_read(lm, LM8323_CMD_READ_ID, buf, 2);
 454         if (unlikely(bytes != 2))
 455                 return -EIO;
 456
 457         return 0;
 458 }
 459
 460 static void lm8323_write_pwm_one(struct lm8323_pwm *pwm, int pos, u16 cmd)
 461 {
 462         struct lm8323_chip *lm = pwm_to_lm8323(pwm);
 463
 464         lm8323_write(lm, 4, LM8323_CMD_PWM_WRITE, (pos << 2) | pwm->id,
 465                      (cmd & 0xff00) >> 8, cmd & 0x00ff);
 466 }
 467
 468 /*
 469  * Write a script into a given PWM engine, concluding with PWM_END.
 470  * If 'kill' is nonzero, the engine will be shut down at the end
 471  * of the script, producing a zero output. Otherwise the engine
 472  * will be kept running at the final PWM level indefinitely.
 473  */
 474 static void lm8323_write_pwm(struct lm8323_pwm *pwm, int kill,
 475                              int len, const u16 *cmds)
 476 {
 477         struct lm8323_chip *lm = pwm_to_lm8323(pwm);
 478         int i;
 479
 480         for (i = 0; i < len; i++)
 481                 lm8323_write_pwm_one(pwm, i, cmds[i]);
 482
 483         lm8323_write_pwm_one(pwm, i++, PWM_END(kill));
 484         lm8323_write(lm, 2, LM8323_CMD_START_PWM, pwm->id);
 485         pwm->running = 1;
 486 }
 487
 488 static void lm8323_pwm_work(struct work_struct *work)
 489 {
 490         struct lm8323_pwm *pwm = work_to_pwm(work);
 491         int div512, perstep, steps, hz, up, kill;
 492         u16 pwm_cmds[3];
 493         int num_cmds = 0;
 494
 495         mutex_lock(&pwm->lock);
 496
 497         /*
 498          * Do nothing if we're already at the requested level,
 499          * or previous setting is not yet complete. In the latter
 500          * case we will be called again when the previous PWM script
 501          * finishes.
 502          */
 503         if (pwm->running || pwm->desired_brightness == pwm->brightness) {
 504                 mutex_unlock(&pwm->lock);
 505                 return;
 506         }
 507
 508         kill = (pwm->desired_brightness == 0);
 509         up = (pwm->desired_brightness > pwm->brightness);
 510         steps = abs(pwm->desired_brightness - pwm->brightness);
 511
 512         /*
 513          * Convert time (in ms) into a divisor (512 or 16 on a refclk of
 514          * 32768Hz), and number of ticks per step.
 515          */
 516         if ((pwm->fade_time / steps) > (32768 / 512)) {
 517                 div512 = 1;
 518                 hz = 32768 / 512;
 519         } else {
 520                 div512 = 0;
 521                 hz = 32768 / 16;
 522         }
 523
 524         perstep = (hz * pwm->fade_time) / (steps * 1000);
 525
 526         if (perstep == 0)
 527                 perstep = 1;
 528         else if (perstep > 63)
 529                 perstep = 63;
 530
 531         while (steps) {
 532                 int s;
 533
 534                 s = min(126, steps);
 535                 pwm_cmds[num_cmds++] = PWM_RAMP(div512, perstep, s, up);
 536                 steps -= s;
 537         }
 538
 539         lm8323_write_pwm(pwm, kill, num_cmds, pwm_cmds);
 540
 541         pwm->brightness = pwm->desired_brightness;
 542         mutex_unlock(&pwm->lock);
 543 }
 544
 545 static void lm8323_pwm_set_brightness(struct led_classdev *led_cdev,
 546                                       enum led_brightness brightness)
 547 {
 548         struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);
 549         struct lm8323_chip *lm = pwm_to_lm8323(pwm);
 550
 551         mutex_lock(&pwm->lock);
 552         pwm->desired_brightness = brightness;
 553         mutex_unlock(&pwm->lock);
 554
 555         if (in_interrupt()) {
 556                 schedule_work(&pwm->work);
 557         } else {
 558                 /*
 559                  * Schedule PWM work as usual unless we are going into suspend
 560                  */
 561                 mutex_lock(&lm->lock);
 562                 if (likely(!lm->pm_suspend))
 563                         schedule_work(&pwm->work);
 564                 else
 565                         lm8323_pwm_work(&pwm->work);
 566                 mutex_unlock(&lm->lock);
 567         }
 568 }
 569
 570 static ssize_t lm8323_pwm_show_time(struct device *dev,
 571                 struct device_attribute *attr, char *buf)
 572 {
 573         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 574         struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);
 575
 576         return sprintf(buf, "%d\n", pwm->fade_time);
 577 }
 578
 579 static ssize_t lm8323_pwm_store_time(struct device *dev,
 580                 struct device_attribute *attr, const char *buf, size_t len)
 581 {
 582         struct led_classdev *led_cdev = dev_get_drvdata(dev);
 583         struct lm8323_pwm *pwm = cdev_to_pwm(led_cdev);
 584         int ret;
 585         int time;
 586
 587         ret = strict_strtoul(buf, 10, &time);
 588         /* Numbers only, please. */
 589         if (ret)
 590                 return -EINVAL;
 591
 592         pwm->fade_time = time;
 593
 594         return strlen(buf);
 595 }
 596 static DEVICE_ATTR(time, 0644, lm8323_pwm_show_time, lm8323_pwm_store_time);
 597
 598 static int init_pwm(struct lm8323_chip *lm, int id, struct device *dev,
 599                     const char *name)
 600 {
 601         struct lm8323_pwm *pwm = NULL;
 602
 603         BUG_ON(id > 3);
 604
 605         switch (id) {
 606         case 1:
 607                 pwm = &lm->pwm1;
 608                 break;
 609         case 2:
 610                 pwm = &lm->pwm2;
 611                 break;
 612         case 3:
 613                 pwm = &lm->pwm3;
 614                 break;
 615         }
 616
 617         pwm->id = id;
 618         pwm->fade_time = 0;
 619         pwm->brightness = 0;
 620         pwm->desired_brightness = 0;
 621         pwm->running = 0;
 622         mutex_init(&pwm->lock);
 623         if (name) {
 624                 pwm->cdev.name = name;
 625                 pwm->cdev.brightness_set = lm8323_pwm_set_brightness;
 626                 if (led_classdev_register(dev, &pwm->cdev) < 0) {
 627                         dev_err(dev, "couldn't register PWM %d\n", id);
 628                         return -1;
 629                 }
 630                 if (device_create_file(pwm->cdev.dev,
 631                                              &dev_attr_time) < 0) {
 632                         dev_err(dev, "couldn't register time attribute\n");
 633                         led_classdev_unregister(&pwm->cdev);
 634                         return -1;
 635                 }
 636                 INIT_WORK(&pwm->work, lm8323_pwm_work);
 637                 pwm->enabled = 1;
 638         } else {
 639                 pwm->enabled = 0;
 640         }
 641
 642         return 0;
 643 }
 644
 645 static struct i2c_driver lm8323_i2c_driver;
 646
 647 static ssize_t lm8323_show_disable(struct device *dev,
 648                                    struct device_attribute *attr, char *buf)
 649 {
 650         struct lm8323_chip *lm = dev_get_drvdata(dev);
 651
 652         return sprintf(buf, "%u\n", !lm->kp_enabled);
 653 }
 654
 655 static ssize_t lm8323_set_disable(struct device *dev,
 656                                   struct device_attribute *attr,
 657                                   const char *buf, size_t count)
 658 {
 659         struct lm8323_chip *lm = dev_get_drvdata(dev);
 660         int ret;
 661         int i;
 662
 663         ret = strict_strtoul(buf, 10, &i);
 664
 665         mutex_lock(&lm->lock);
 666         lm->kp_enabled = !i;
 667         mutex_unlock(&lm->lock);
 668
 669         return count;
 670 }
 671 static DEVICE_ATTR(disable_kp, 0644, lm8323_show_disable, lm8323_set_disable);
 672
 673 static int lm8323_probe(struct i2c_client *client,
 674                 const struct i2c_device_id *id)
 675 {
 676         struct lm8323_platform_data *pdata;
 677         struct input_dev *idev;
 678         struct lm8323_chip *lm;
 679         int i, err = 0;
 680         unsigned long tmo;
 681         u8 data[2];
 682
 683         lm = kzalloc(sizeof *lm, GFP_KERNEL);
 684         if (!lm)
 685                 return -ENOMEM;
 686
 687         i2c_set_clientdata(client, lm);
 688         lm->client = client;
 689         pdata = client->dev.platform_data;
 690         if (!pdata || !pdata->size_x || !pdata->size_y) {
 691                 dev_err(&client->dev, "missing platform_data\n");
 692                 err = -EINVAL;
 693                 goto fail2;
 694         }
 695
 696         lm->size_x = pdata->size_x;
 697         if (lm->size_x > 8) {
 698                 dev_err(&client->dev, "invalid x size %d specified\n",
 699                                 lm->size_x);
 700                 err = -EINVAL;
 701                 goto fail2;
 702         }
 703
 704         lm->size_y = pdata->size_y;
 705         if (lm->size_y > 12) {
 706                 dev_err(&client->dev, "invalid y size %d specified\n",
 707                                 lm->size_y);
 708                 err = -EINVAL;
 709                 goto fail2;
 710         }
 711
 712         dev_vdbg(&client->dev, "Keypad size: %d x %d\n",
 713                         lm->size_x, lm->size_y);
 714
 715         lm->debounce_time = pdata->debounce_time;
 716         lm->active_time = pdata->active_time;
 717
 718         lm8323_reset(lm);
 719
 720         /* Nothing's set up to service the IRQ yet, so just spin for max.
 721          * 100ms until we can configure. */
 722         tmo = jiffies + msecs_to_jiffies(100);
 723         while (lm8323_read(lm, LM8323_CMD_READ_INT, data, 1) == 1) {
 724                 if (data[0] & INT_NOINIT)
 725                         break;
 726
 727                 if (time_after(jiffies, tmo)) {
 728                         dev_err(&client->dev,
 729                                         "timeout waiting for initialisation\n");
 730                         break;
 731                 }
 732
 733                 msleep(1);
 734         }
 735         lm8323_configure(lm);
 736
 737         /* If a true probe check the device */
 738         if (lm8323_read_id(lm, data) != 0) {
 739                 dev_err(&client->dev, "device not found\n");
 740                 err = -ENODEV;
 741                 goto fail2;
 742         }
 743
 744         if (init_pwm(lm, 1, &client->dev, pdata->pwm1_name) < 0)
 745                 goto fail3;
 746         if (init_pwm(lm, 2, &client->dev, pdata->pwm2_name) < 0)
 747                 goto fail4;
 748         if (init_pwm(lm, 3, &client->dev, pdata->pwm3_name) < 0)
 749                 goto fail5;
 750
 751         mutex_init(&lm->lock);
 752         INIT_WORK(&lm->work, lm8323_work);
 753
 754         err = request_irq(client->irq, lm8323_irq,
 755                           IRQF_TRIGGER_FALLING | IRQF_DISABLED,
 756                           "lm8323", lm);
 757         if (err) {
 758                 dev_err(&client->dev, "could not get IRQ %d\n", client->irq);
 759                 goto fail6;
 760         }
 761
 762         device_init_wakeup(&client->dev, 1);
 763         enable_irq_wake(client->irq);
 764
 765         lm->kp_enabled = 1;
 766         err = device_create_file(&client->dev, &dev_attr_disable_kp);
 767         if (err < 0)
 768                 goto fail7;
 769
 770         idev = input_allocate_device();
 771         if (!idev) {
 772                 err = -ENOMEM;
 773                 goto fail8;
 774         }
 775
 776         if (pdata->name)
 777                 idev->name = pdata->name;
 778         else
 779                 idev->name = "LM8323 keypad";
 780         snprintf(lm->phys, sizeof(lm->phys), "%s/input-kp", dev_name(&client->dev));
 781         idev->phys = lm->phys;
 782
 783         lm->keys_down = 0;
 784         idev->evbit[0] = BIT(EV_KEY);
 785         for (i = 0; i < LM8323_KEYMAP_SIZE; i++) {
 786                 if (pdata->keymap[i] > 0)
 787                         __set_bit(pdata->keymap[i], idev->keybit);
 788
 789                 lm->keymap[i] = pdata->keymap[i];
 790         }
 791
 792         if (pdata->repeat)
 793                 __set_bit(EV_REP, idev->evbit);
 794
 795         lm->idev = idev;
 796         err = input_register_device(idev);
 797         if (err) {
 798                 dev_dbg(&client->dev, "error registering input device\n");
 799                 goto fail8;
 800         }
 801
 802         return 0;
 803
 804 fail8:
 805         device_remove_file(&client->dev, &dev_attr_disable_kp);
 806 fail7:
 807         free_irq(client->irq, lm);
 808 fail6:
 809         if (lm->pwm3.enabled)
 810                 led_classdev_unregister(&lm->pwm3.cdev);
 811 fail5:
 812         if (lm->pwm2.enabled)
 813                 led_classdev_unregister(&lm->pwm2.cdev);
 814 fail4:
 815         if (lm->pwm1.enabled)
 816                 led_classdev_unregister(&lm->pwm1.cdev);
 817 fail3:
 818 fail2:
 819         kfree(lm);
 820         return err;
 821 }
 822
 823 static int lm8323_remove(struct i2c_client *client)
 824 {
 825         struct lm8323_chip *lm = i2c_get_clientdata(client);
 826
 827         disable_irq_wake(client->irq);
 828         free_irq(client->irq, lm);
 829         cancel_work_sync(&lm->work);
 830         input_unregister_device(lm->idev);
 831         device_remove_file(&lm->client->dev, &dev_attr_disable_kp);
 832         if (lm->pwm3.enabled)
 833                 led_classdev_unregister(&lm->pwm3.cdev);
 834         if (lm->pwm2.enabled)
 835                 led_classdev_unregister(&lm->pwm2.cdev);
 836         if (lm->pwm1.enabled)
 837                 led_classdev_unregister(&lm->pwm1.cdev);
 838         kfree(lm);
 839
 840         return 0;
 841 }
 842
 843 #ifdef CONFIG_PM
 844 /*
 845  * We don't need to explicitly suspend the chip, as it already switches off
 846  * when there's no activity.
 847  */
 848 static int lm8323_suspend(struct i2c_client *client, pm_message_t mesg)
 849 {
 850         struct lm8323_chip *lm = i2c_get_clientdata(client);
 851
 852         set_irq_wake(client->irq, 0);
 853         disable_irq(client->irq);
 854
 855         mutex_lock(&lm->lock);
 856         lm->pm_suspend = 1;
 857         mutex_unlock(&lm->lock);
 858
 859         if (lm->pwm1.enabled)
 860                 led_classdev_suspend(&lm->pwm1.cdev);
 861         if (lm->pwm2.enabled)
 862                 led_classdev_suspend(&lm->pwm2.cdev);
 863         if (lm->pwm3.enabled)
 864                 led_classdev_suspend(&lm->pwm3.cdev);
 865
 866         return 0;
 867 }
 868
 869 static int lm8323_resume(struct i2c_client *client)
 870 {
 871         struct lm8323_chip *lm = i2c_get_clientdata(client);
 872
 873         mutex_lock(&lm->lock);
 874         lm->pm_suspend = 0;
 875         mutex_unlock(&lm->lock);
 876
 877         if (lm->pwm1.enabled)
 878                 led_classdev_resume(&lm->pwm1.cdev);
 879         if (lm->pwm2.enabled)
 880                 led_classdev_resume(&lm->pwm2.cdev);
 881         if (lm->pwm3.enabled)
 882                 led_classdev_resume(&lm->pwm3.cdev);
 883
 884         enable_irq(client->irq);
 885         set_irq_wake(client->irq, 1);
 886
 887         return 0;
 888 }
 889 #else
 890 #define lm8323_suspend  NULL
 891 #define lm8323_resume   NULL
 892 #endif
 893
 894 static const struct i2c_device_id lm8323_id[] = {
 895         { "lm8323", 0 },
 896         { }
 897 };
 898
 899 static struct i2c_driver lm8323_i2c_driver = {
 900         .driver = {
 901                 .name    = "lm8323",
 902         },
 903         .probe          = lm8323_probe,
 904         .remove         = lm8323_remove,
 905         .suspend        = lm8323_suspend,
 906         .resume         = lm8323_resume,
 907         .id_table       = lm8323_id,
 908 };
 909 MODULE_DEVICE_TABLE(i2c, lm8323_id);
 910
 911 static int __init lm8323_init(void)
 912 {
 913         return i2c_add_driver(&lm8323_i2c_driver);
 914 }
 915 module_init(lm8323_init);
 916
 917 static void __exit lm8323_exit(void)
 918 {
 919         i2c_del_driver(&lm8323_i2c_driver);
 920 }
 921 module_exit(lm8323_exit);
 922
 923 MODULE_AUTHOR("Timo O. Karjalainen <timo.o.karjalainen@nokia.com>");
 924 MODULE_AUTHOR("Daniel Stone");
 925 MODULE_AUTHOR("Felipe Balbi <felipe.balbi@nokia.com>");
 926 MODULE_DESCRIPTION("LM8323 keypad driver");
 927 MODULE_LICENSE("GPL");
 928