drivers/input/keyboard/corgikbd.c

   1 /*
   2  *  Keyboard driver for Sharp Corgi models (SL-C7xx)
   3  *
   4  *  Copyright (c) 2004-2005 Richard Purdie
   5  *
   6  *  Based on xtkbd.c/locomkbd.c
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License version 2 as
  10  *  published by the Free Software Foundation.
  11  *
  12  */
  13
  14 #include <linux/delay.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/init.h>
  17 #include <linux/input.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/jiffies.h>
  20 #include <linux/module.h>
  21 #include <linux/slab.h>
  22
  23 #include <mach/corgi.h>
  24 #include <mach/pxa2xx-gpio.h>
  25 #include <asm/hardware/scoop.h>
  26
  27 #define KB_ROWS                         8
  28 #define KB_COLS                         12
  29 #define KB_ROWMASK(r)           (1 << (r))
  30 #define SCANCODE(r,c)           ( ((r)<<4) + (c) + 1 )
  31 /* zero code, 124 scancodes */
  32 #define NR_SCANCODES            ( SCANCODE(KB_ROWS-1,KB_COLS-1) +1 +1 )
  33
  34 #define SCAN_INTERVAL           (50) /* ms */
  35 #define HINGE_SCAN_INTERVAL     (250) /* ms */
  36
  37 #define CORGI_KEY_CALENDER      KEY_F1
  38 #define CORGI_KEY_ADDRESS       KEY_F2
  39 #define CORGI_KEY_FN            KEY_F3
  40 #define CORGI_KEY_CANCEL        KEY_F4
  41 #define CORGI_KEY_OFF           KEY_SUSPEND
  42 #define CORGI_KEY_EXOK          KEY_F5
  43 #define CORGI_KEY_EXCANCEL      KEY_F6
  44 #define CORGI_KEY_EXJOGDOWN     KEY_F7
  45 #define CORGI_KEY_EXJOGUP       KEY_F8
  46 #define CORGI_KEY_JAP1          KEY_LEFTCTRL
  47 #define CORGI_KEY_JAP2          KEY_LEFTALT
  48 #define CORGI_KEY_MAIL          KEY_F10
  49 #define CORGI_KEY_OK            KEY_F11
  50 #define CORGI_KEY_MENU          KEY_F12
  51
  52 static unsigned char corgikbd_keycode[NR_SCANCODES] = {
  53         0,                                                                                                                /* 0 */
  54         0, KEY_1, KEY_3, KEY_5, KEY_6, KEY_7, KEY_9, KEY_0, KEY_BACKSPACE, 0, 0, 0, 0, 0, 0, 0,                               /* 1-16 */
  55         0, KEY_2, KEY_4, KEY_R, KEY_Y, KEY_8, KEY_I, KEY_O, KEY_P, 0, 0, 0, 0, 0, 0, 0,                                   /* 17-32 */
  56         KEY_TAB, KEY_Q, KEY_E, KEY_T, KEY_G, KEY_U, KEY_J, KEY_K, 0, 0, 0, 0, 0, 0, 0, 0,                                 /* 33-48 */
  57         CORGI_KEY_CALENDER, KEY_W, KEY_S, KEY_F, KEY_V, KEY_H, KEY_M, KEY_L, 0, KEY_RIGHTSHIFT, 0, 0, 0, 0, 0, 0,         /* 49-64 */
  58         CORGI_KEY_ADDRESS, KEY_A, KEY_D, KEY_C, KEY_B, KEY_N, KEY_DOT, 0, KEY_ENTER, 0, KEY_LEFTSHIFT, 0, 0, 0, 0, 0,     /* 65-80 */
  59         CORGI_KEY_MAIL, KEY_Z, KEY_X, KEY_MINUS, KEY_SPACE, KEY_COMMA, 0, KEY_UP, 0, 0, 0, CORGI_KEY_FN, 0, 0, 0, 0,            /* 81-96 */
  60         KEY_SYSRQ, CORGI_KEY_JAP1, CORGI_KEY_JAP2, CORGI_KEY_CANCEL, CORGI_KEY_OK, CORGI_KEY_MENU, KEY_LEFT, KEY_DOWN, KEY_RIGHT, 0, 0, 0, 0, 0, 0, 0,  /* 97-112 */
  61         CORGI_KEY_OFF, CORGI_KEY_EXOK, CORGI_KEY_EXCANCEL, CORGI_KEY_EXJOGDOWN, CORGI_KEY_EXJOGUP, 0, 0, 0, 0, 0, 0, 0,   /* 113-124 */
  62 };
  63
  64
  65 struct corgikbd {
  66         unsigned char keycode[ARRAY_SIZE(corgikbd_keycode)];
  67         struct input_dev *input;
  68
  69         spinlock_t lock;
  70         struct timer_list timer;
  71         struct timer_list htimer;
  72
  73         unsigned int suspended;
  74         unsigned long suspend_jiffies;
  75 };
  76
  77 #define KB_DISCHARGE_DELAY      10
  78 #define KB_ACTIVATE_DELAY       10
  79
  80 /* Helper functions for reading the keyboard matrix
  81  * Note: We should really be using the generic gpio functions to alter
  82  *       GPDR but it requires a function call per GPIO bit which is
  83  *       excessive when we need to access 12 bits at once, multiple times.
  84  * These functions must be called within local_irq_save()/local_irq_restore()
  85  * or similar.
  86  */
  87 static inline void corgikbd_discharge_all(void)
  88 {
  89         /* STROBE All HiZ */
  90         GPCR2  = CORGI_GPIO_ALL_STROBE_BIT;
  91         GPDR2 &= ~CORGI_GPIO_ALL_STROBE_BIT;
  92 }
  93
  94 static inline void corgikbd_activate_all(void)
  95 {
  96         /* STROBE ALL -> High */
  97         GPSR2  = CORGI_GPIO_ALL_STROBE_BIT;
  98         GPDR2 |= CORGI_GPIO_ALL_STROBE_BIT;
  99
 100         udelay(KB_DISCHARGE_DELAY);
 101
 102         /* Clear any interrupts we may have triggered when altering the GPIO lines */
 103         GEDR1 = CORGI_GPIO_HIGH_SENSE_BIT;
 104         GEDR2 = CORGI_GPIO_LOW_SENSE_BIT;
 105 }
 106
 107 static inline void corgikbd_activate_col(int col)
 108 {
 109         /* STROBE col -> High, not col -> HiZ */
 110         GPSR2 = CORGI_GPIO_STROBE_BIT(col);
 111         GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);
 112 }
 113
 114 static inline void corgikbd_reset_col(int col)
 115 {
 116         /* STROBE col -> Low */
 117         GPCR2 = CORGI_GPIO_STROBE_BIT(col);
 118         /* STROBE col -> out, not col -> HiZ */
 119         GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);
 120 }
 121
 122 #define GET_ROWS_STATUS(c)      (((GPLR1 & CORGI_GPIO_HIGH_SENSE_BIT) >> CORGI_GPIO_HIGH_SENSE_RSHIFT) | ((GPLR2 & CORGI_GPIO_LOW_SENSE_BIT) << CORGI_GPIO_LOW_SENSE_LSHIFT))
 123
 124 /*
 125  * The corgi keyboard only generates interrupts when a key is pressed.
 126  * When a key is pressed, we enable a timer which then scans the
 127  * keyboard to detect when the key is released.
 128  */
 129
 130 /* Scan the hardware keyboard and push any changes up through the input layer */
 131 static void corgikbd_scankeyboard(struct corgikbd *corgikbd_data)
 132 {
 133         unsigned int row, col, rowd;
 134         unsigned long flags;
 135         unsigned int num_pressed;
 136
 137         if (corgikbd_data->suspended)
 138                 return;
 139
 140         spin_lock_irqsave(&corgikbd_data->lock, flags);
 141
 142         num_pressed = 0;
 143         for (col = 0; col < KB_COLS; col++) {
 144                 /*
 145                  * Discharge the output driver capacitatance
 146                  * in the keyboard matrix. (Yes it is significant..)
 147                  */
 148
 149                 corgikbd_discharge_all();
 150                 udelay(KB_DISCHARGE_DELAY);
 151
 152                 corgikbd_activate_col(col);
 153                 udelay(KB_ACTIVATE_DELAY);
 154
 155                 rowd = GET_ROWS_STATUS(col);
 156                 for (row = 0; row < KB_ROWS; row++) {
 157                         unsigned int scancode, pressed;
 158
 159                         scancode = SCANCODE(row, col);
 160                         pressed = rowd & KB_ROWMASK(row);
 161
 162                         input_report_key(corgikbd_data->input, corgikbd_data->keycode[scancode], pressed);
 163
 164                         if (pressed)
 165                                 num_pressed++;
 166
 167                         if (pressed && (corgikbd_data->keycode[scancode] == CORGI_KEY_OFF)
 168                                         && time_after(jiffies, corgikbd_data->suspend_jiffies + HZ)) {
 169                                 input_event(corgikbd_data->input, EV_PWR, CORGI_KEY_OFF, 1);
 170                                 corgikbd_data->suspend_jiffies=jiffies;
 171                         }
 172                 }
 173                 corgikbd_reset_col(col);
 174         }
 175
 176         corgikbd_activate_all();
 177
 178         input_sync(corgikbd_data->input);
 179
 180         /* if any keys are pressed, enable the timer */
 181         if (num_pressed)
 182                 mod_timer(&corgikbd_data->timer, jiffies + msecs_to_jiffies(SCAN_INTERVAL));
 183
 184         spin_unlock_irqrestore(&corgikbd_data->lock, flags);
 185 }
 186
 187 /*
 188  * corgi keyboard interrupt handler.
 189  */
 190 static irqreturn_t corgikbd_interrupt(int irq, void *dev_id)
 191 {
 192         struct corgikbd *corgikbd_data = dev_id;
 193
 194         if (!timer_pending(&corgikbd_data->timer)) {
 195                 /** wait chattering delay **/
 196                 udelay(20);
 197                 corgikbd_scankeyboard(corgikbd_data);
 198         }
 199
 200         return IRQ_HANDLED;
 201 }
 202
 203 /*
 204  * corgi timer checking for released keys
 205  */
 206 static void corgikbd_timer_callback(unsigned long data)
 207 {
 208         struct corgikbd *corgikbd_data = (struct corgikbd *) data;
 209         corgikbd_scankeyboard(corgikbd_data);
 210 }
 211
 212 /*
 213  * The hinge switches generate no interrupt so they need to be
 214  * monitored by a timer.
 215  *
 216  * We debounce the switches and pass them to the input system.
 217  *
 218  *  gprr == 0x00 - Keyboard with Landscape Screen
 219  *          0x08 - No Keyboard with Portrait Screen
 220  *          0x0c - Keyboard and Screen Closed
 221  */
 222
 223 #define READ_GPIO_BIT(x)    (GPLR(x) & GPIO_bit(x))
 224 #define HINGE_STABLE_COUNT 2
 225 static int sharpsl_hinge_state;
 226 static int hinge_count;
 227
 228 static void corgikbd_hinge_timer(unsigned long data)
 229 {
 230         struct corgikbd *corgikbd_data = (struct corgikbd *) data;
 231         unsigned long gprr;
 232         unsigned long flags;
 233
 234         gprr = read_scoop_reg(&corgiscoop_device.dev, SCOOP_GPRR) & (CORGI_SCP_SWA | CORGI_SCP_SWB);
 235         gprr |= (READ_GPIO_BIT(CORGI_GPIO_AK_INT) != 0);
 236         if (gprr != sharpsl_hinge_state) {
 237                 hinge_count = 0;
 238                 sharpsl_hinge_state = gprr;
 239         } else if (hinge_count < HINGE_STABLE_COUNT) {
 240                 hinge_count++;
 241                 if (hinge_count >= HINGE_STABLE_COUNT) {
 242                         spin_lock_irqsave(&corgikbd_data->lock, flags);
 243
 244                         input_report_switch(corgikbd_data->input, SW_LID, ((sharpsl_hinge_state & CORGI_SCP_SWA) != 0));
 245                         input_report_switch(corgikbd_data->input, SW_TABLET_MODE, ((sharpsl_hinge_state & CORGI_SCP_SWB) != 0));
 246                         input_report_switch(corgikbd_data->input, SW_HEADPHONE_INSERT, (READ_GPIO_BIT(CORGI_GPIO_AK_INT) != 0));
 247                         input_sync(corgikbd_data->input);
 248
 249                         spin_unlock_irqrestore(&corgikbd_data->lock, flags);
 250                 }
 251         }
 252         mod_timer(&corgikbd_data->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL));
 253 }
 254
 255 #ifdef CONFIG_PM
 256 static int corgikbd_suspend(struct platform_device *dev, pm_message_t state)
 257 {
 258         int i;
 259         struct corgikbd *corgikbd = platform_get_drvdata(dev);
 260
 261         corgikbd->suspended = 1;
 262         /* strobe 0 is the power key so this can't be made an input for
 263            powersaving therefore i = 1 */
 264         for (i = 1; i < CORGI_KEY_STROBE_NUM; i++)
 265                 pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_IN);
 266
 267         return 0;
 268 }
 269
 270 static int corgikbd_resume(struct platform_device *dev)
 271 {
 272         int i;
 273         struct corgikbd *corgikbd = platform_get_drvdata(dev);
 274
 275         for (i = 1; i < CORGI_KEY_STROBE_NUM; i++)
 276                 pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_OUT | GPIO_DFLT_HIGH);
 277
 278         /* Upon resume, ignore the suspend key for a short while */
 279         corgikbd->suspend_jiffies=jiffies;
 280         corgikbd->suspended = 0;
 281
 282         return 0;
 283 }
 284 #else
 285 #define corgikbd_suspend        NULL
 286 #define corgikbd_resume         NULL
 287 #endif
 288
 289 static int __devinit corgikbd_probe(struct platform_device *pdev)
 290 {
 291         struct corgikbd *corgikbd;
 292         struct input_dev *input_dev;
 293         int i, err = -ENOMEM;
 294
 295         corgikbd = kzalloc(sizeof(struct corgikbd), GFP_KERNEL);
 296         input_dev = input_allocate_device();
 297         if (!corgikbd || !input_dev)
 298                 goto fail;
 299
 300         platform_set_drvdata(pdev, corgikbd);
 301
 302         corgikbd->input = input_dev;
 303         spin_lock_init(&corgikbd->lock);
 304
 305         /* Init Keyboard rescan timer */
 306         init_timer(&corgikbd->timer);
 307         corgikbd->timer.function = corgikbd_timer_callback;
 308         corgikbd->timer.data = (unsigned long) corgikbd;
 309
 310         /* Init Hinge Timer */
 311         init_timer(&corgikbd->htimer);
 312         corgikbd->htimer.function = corgikbd_hinge_timer;
 313         corgikbd->htimer.data = (unsigned long) corgikbd;
 314
 315         corgikbd->suspend_jiffies=jiffies;
 316
 317         memcpy(corgikbd->keycode, corgikbd_keycode, sizeof(corgikbd->keycode));
 318
 319         input_dev->name = "Corgi Keyboard";
 320         input_dev->phys = "corgikbd/input0";
 321         input_dev->id.bustype = BUS_HOST;
 322         input_dev->id.vendor = 0x0001;
 323         input_dev->id.product = 0x0001;
 324         input_dev->id.version = 0x0100;
 325         input_dev->dev.parent = &pdev->dev;
 326
 327         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) |
 328                 BIT_MASK(EV_PWR) | BIT_MASK(EV_SW);
 329         input_dev->keycode = corgikbd->keycode;
 330         input_dev->keycodesize = sizeof(unsigned char);
 331         input_dev->keycodemax = ARRAY_SIZE(corgikbd_keycode);
 332
 333         for (i = 0; i < ARRAY_SIZE(corgikbd_keycode); i++)
 334                 set_bit(corgikbd->keycode[i], input_dev->keybit);
 335         clear_bit(0, input_dev->keybit);
 336         set_bit(SW_LID, input_dev->swbit);
 337         set_bit(SW_TABLET_MODE, input_dev->swbit);
 338         set_bit(SW_HEADPHONE_INSERT, input_dev->swbit);
 339
 340         err = input_register_device(corgikbd->input);
 341         if (err)
 342                 goto fail;
 343
 344         mod_timer(&corgikbd->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL));
 345
 346         /* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */
 347         for (i = 0; i < CORGI_KEY_SENSE_NUM; i++) {
 348                 pxa_gpio_mode(CORGI_GPIO_KEY_SENSE(i) | GPIO_IN);
 349                 if (request_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd_interrupt,
 350                                 IRQF_DISABLED | IRQF_TRIGGER_RISING,
 351                                 "corgikbd", corgikbd))
 352                         printk(KERN_WARNING "corgikbd: Can't get IRQ: %d!\n", i);
 353         }
 354
 355         /* Set Strobe lines as outputs - set high */
 356         for (i = 0; i < CORGI_KEY_STROBE_NUM; i++)
 357                 pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_OUT | GPIO_DFLT_HIGH);
 358
 359         /* Setup the headphone jack as an input */
 360         pxa_gpio_mode(CORGI_GPIO_AK_INT | GPIO_IN);
 361
 362         return 0;
 363
 364  fail:  input_free_device(input_dev);
 365         kfree(corgikbd);
 366         return err;
 367 }
 368
 369 static int __devexit corgikbd_remove(struct platform_device *pdev)
 370 {
 371         int i;
 372         struct corgikbd *corgikbd = platform_get_drvdata(pdev);
 373
 374         for (i = 0; i < CORGI_KEY_SENSE_NUM; i++)
 375                 free_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd);
 376
 377         del_timer_sync(&corgikbd->htimer);
 378         del_timer_sync(&corgikbd->timer);
 379
 380         input_unregister_device(corgikbd->input);
 381
 382         kfree(corgikbd);
 383
 384         return 0;
 385 }
 386
 387 static struct platform_driver corgikbd_driver = {
 388         .probe          = corgikbd_probe,
 389         .remove         = __devexit_p(corgikbd_remove),
 390         .suspend        = corgikbd_suspend,
 391         .resume         = corgikbd_resume,
 392         .driver         = {
 393                 .name   = "corgi-keyboard",
 394                 .owner  = THIS_MODULE,
 395         },
 396 };
 397
 398 static int __init corgikbd_init(void)
 399 {
 400         return platform_driver_register(&corgikbd_driver);
 401 }
 402
 403 static void __exit corgikbd_exit(void)
 404 {
 405         platform_driver_unregister(&corgikbd_driver);
 406 }
 407
 408 module_init(corgikbd_init);
 409 module_exit(corgikbd_exit);
 410
 411 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
 412 MODULE_DESCRIPTION("Corgi Keyboard Driver");
 413 MODULE_LICENSE("GPL v2");
 414 MODULE_ALIAS("platform:corgi-keyboard");