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