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