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 <asm/arch/corgi.h>
  24 #include <asm/arch/hardware.h>
  25 #include <asm/arch/pxa-regs.h>
  26 #include <asm/hardware/scoop.h>
  27
  28 #define KB_ROWS                         8
  29 #define KB_COLS                         12
  30 #define KB_ROWMASK(r)           (1 << (r))
  31 #define SCANCODE(r,c)           ( ((r)<<4) + (c) + 1 )
  32 /* zero code, 124 scancodes */
  33 #define NR_SCANCODES            ( SCANCODE(KB_ROWS-1,KB_COLS-1) +1 +1 )
  34
  35 #define SCAN_INTERVAL           (50) /* ms */
  36 #define HINGE_SCAN_INTERVAL     (250) /* ms */
  37
  38 #define CORGI_KEY_CALENDER      KEY_F1
  39 #define CORGI_KEY_ADDRESS       KEY_F2
  40 #define CORGI_KEY_FN            KEY_F3
  41 #define CORGI_KEY_CANCEL        KEY_F4
  42 #define CORGI_KEY_OFF           KEY_SUSPEND
  43 #define CORGI_KEY_EXOK          KEY_F5
  44 #define CORGI_KEY_EXCANCEL      KEY_F6
  45 #define CORGI_KEY_EXJOGDOWN     KEY_F7
  46 #define CORGI_KEY_EXJOGUP       KEY_F8
  47 #define CORGI_KEY_JAP1          KEY_LEFTCTRL
  48 #define CORGI_KEY_JAP2          KEY_LEFTALT
  49 #define CORGI_KEY_MAIL          KEY_F10
  50 #define CORGI_KEY_OK            KEY_F11
  51 #define CORGI_KEY_MENU          KEY_F12
  52
  53 static unsigned char corgikbd_keycode[NR_SCANCODES] = {
  54         0,                                                                                                                /* 0 */
  55         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 */
  56         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 */
  57         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 */
  58         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 */
  59         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 */
  60         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 */
  61         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 */
  62         CORGI_KEY_OFF, CORGI_KEY_EXOK, CORGI_KEY_EXCANCEL, CORGI_KEY_EXJOGDOWN, CORGI_KEY_EXJOGUP, 0, 0, 0, 0, 0, 0, 0,   /* 113-124 */
  63 };
  64
  65
  66 struct corgikbd {
  67         unsigned char keycode[ARRAY_SIZE(corgikbd_keycode)];
  68         struct input_dev *input;
  69
  70         spinlock_t lock;
  71         struct timer_list timer;
  72         struct timer_list htimer;
  73
  74         unsigned int suspended;
  75         unsigned long suspend_jiffies;
  76 };
  77
  78 #define KB_DISCHARGE_DELAY      10
  79 #define KB_ACTIVATE_DELAY       10
  80
  81 /* Helper functions for reading the keyboard matrix
  82  * Note: We should really be using pxa_gpio_mode to alter GPDR but it
  83  *       requires a function call per GPIO bit which is excessive
  84  *       when we need to access 12 bits at once multiple times.
  85  * These functions must be called within local_irq_save()/local_irq_restore()
  86  * or similar.
  87  */
  88 static inline void corgikbd_discharge_all(void)
  89 {
  90         /* STROBE All HiZ */
  91         GPCR2  = CORGI_GPIO_ALL_STROBE_BIT;
  92         GPDR2 &= ~CORGI_GPIO_ALL_STROBE_BIT;
  93 }
  94
  95 static inline void corgikbd_activate_all(void)
  96 {
  97         /* STROBE ALL -> High */
  98         GPSR2  = CORGI_GPIO_ALL_STROBE_BIT;
  99         GPDR2 |= CORGI_GPIO_ALL_STROBE_BIT;
 100
 101         udelay(KB_DISCHARGE_DELAY);
 102
 103         /* Clear any interrupts we may have triggered when altering the GPIO lines */
 104         GEDR1 = CORGI_GPIO_HIGH_SENSE_BIT;
 105         GEDR2 = CORGI_GPIO_LOW_SENSE_BIT;
 106 }
 107
 108 static inline void corgikbd_activate_col(int col)
 109 {
 110         /* STROBE col -> High, not col -> HiZ */
 111         GPSR2 = CORGI_GPIO_STROBE_BIT(col);
 112         GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);
 113 }
 114
 115 static inline void corgikbd_reset_col(int col)
 116 {
 117         /* STROBE col -> Low */
 118         GPCR2 = CORGI_GPIO_STROBE_BIT(col);
 119         /* STROBE col -> out, not col -> HiZ */
 120         GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);
 121 }
 122
 123 #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))
 124
 125 /*
 126  * The corgi keyboard only generates interrupts when a key is pressed.
 127  * When a key is pressed, we enable a timer which then scans the
 128  * keyboard to detect when the key is released.
 129  */
 130
 131 /* Scan the hardware keyboard and push any changes up through the input layer */
 132 static void corgikbd_scankeyboard(struct corgikbd *corgikbd_data, struct pt_regs *regs)
 133 {
 134         unsigned int row, col, rowd;
 135         unsigned long flags;
 136         unsigned int num_pressed;
 137
 138         if (corgikbd_data->suspended)
 139                 return;
 140
 141         spin_lock_irqsave(&corgikbd_data->lock, flags);
 142
 143         if (regs)
 144                 input_regs(corgikbd_data->input, regs);
 145
 146         num_pressed = 0;
 147         for (col = 0; col < KB_COLS; col++) {
 148                 /*
 149                  * Discharge the output driver capacitatance
 150                  * in the keyboard matrix. (Yes it is significant..)
 151                  */
 152
 153                 corgikbd_discharge_all();
 154                 udelay(KB_DISCHARGE_DELAY);
 155
 156                 corgikbd_activate_col(col);
 157                 udelay(KB_ACTIVATE_DELAY);
 158
 159                 rowd = GET_ROWS_STATUS(col);
 160                 for (row = 0; row < KB_ROWS; row++) {
 161                         unsigned int scancode, pressed;
 162
 163                         scancode = SCANCODE(row, col);
 164                         pressed = rowd & KB_ROWMASK(row);
 165
 166                         input_report_key(corgikbd_data->input, corgikbd_data->keycode[scancode], pressed);
 167
 168                         if (pressed)
 169                                 num_pressed++;
 170
 171                         if (pressed && (corgikbd_data->keycode[scancode] == CORGI_KEY_OFF)
 172                                         && time_after(jiffies, corgikbd_data->suspend_jiffies + HZ)) {
 173                                 input_event(corgikbd_data->input, EV_PWR, CORGI_KEY_OFF, 1);
 174                                 corgikbd_data->suspend_jiffies=jiffies;
 175                         }
 176                 }
 177                 corgikbd_reset_col(col);
 178         }
 179
 180         corgikbd_activate_all();
 181
 182         input_sync(corgikbd_data->input);
 183
 184         /* if any keys are pressed, enable the timer */
 185         if (num_pressed)
 186                 mod_timer(&corgikbd_data->timer, jiffies + msecs_to_jiffies(SCAN_INTERVAL));
 187
 188         spin_unlock_irqrestore(&corgikbd_data->lock, flags);
 189 }
 190
 191 /*
 192  * corgi keyboard interrupt handler.
 193  */
 194 static irqreturn_t corgikbd_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 195 {
 196         struct corgikbd *corgikbd_data = dev_id;
 197
 198         if (!timer_pending(&corgikbd_data->timer)) {
 199                 /** wait chattering delay **/
 200                 udelay(20);
 201                 corgikbd_scankeyboard(corgikbd_data, regs);
 202         }
 203
 204         return IRQ_HANDLED;
 205 }
 206
 207 /*
 208  * corgi timer checking for released keys
 209  */
 210 static void corgikbd_timer_callback(unsigned long data)
 211 {
 212         struct corgikbd *corgikbd_data = (struct corgikbd *) data;
 213         corgikbd_scankeyboard(corgikbd_data, NULL);
 214 }
 215
 216 /*
 217  * The hinge switches generate no interrupt so they need to be
 218  * monitored by a timer.
 219  *
 220  * We debounce the switches and pass them to the input system.
 221  *
 222  *  gprr == 0x00 - Keyboard with Landscape Screen
 223  *          0x08 - No Keyboard with Portrait Screen
 224  *          0x0c - Keyboard and Screen Closed
 225  */
 226
 227 #define READ_GPIO_BIT(x)    (GPLR(x) & GPIO_bit(x))
 228 #define HINGE_STABLE_COUNT 2
 229 static int sharpsl_hinge_state;
 230 static int hinge_count;
 231
 232 static void corgikbd_hinge_timer(unsigned long data)
 233 {
 234         struct corgikbd *corgikbd_data = (struct corgikbd *) data;
 235         unsigned long gprr;
 236         unsigned long flags;
 237
 238         gprr = read_scoop_reg(&corgiscoop_device.dev, SCOOP_GPRR) & (CORGI_SCP_SWA | CORGI_SCP_SWB);
 239         gprr |= (READ_GPIO_BIT(CORGI_GPIO_AK_INT) != 0);
 240         if (gprr != sharpsl_hinge_state) {
 241                 hinge_count = 0;
 242                 sharpsl_hinge_state = gprr;
 243         } else if (hinge_count < HINGE_STABLE_COUNT) {
 244                 hinge_count++;
 245                 if (hinge_count >= HINGE_STABLE_COUNT) {
 246                         spin_lock_irqsave(&corgikbd_data->lock, flags);
 247
 248                         input_report_switch(corgikbd_data->input, SW_LID, ((sharpsl_hinge_state & CORGI_SCP_SWA) != 0));
 249                         input_report_switch(corgikbd_data->input, SW_TABLET_MODE, ((sharpsl_hinge_state & CORGI_SCP_SWB) != 0));
 250                         input_report_switch(corgikbd_data->input, SW_HEADPHONE_INSERT, (READ_GPIO_BIT(CORGI_GPIO_AK_INT) != 0));
 251                         input_sync(corgikbd_data->input);
 252
 253                         spin_unlock_irqrestore(&corgikbd_data->lock, flags);
 254                 }
 255         }
 256         mod_timer(&corgikbd_data->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL));
 257 }
 258
 259 #ifdef CONFIG_PM
 260 static int corgikbd_suspend(struct platform_device *dev, pm_message_t state)
 261 {
 262         int i;
 263         struct corgikbd *corgikbd = platform_get_drvdata(dev);
 264
 265         corgikbd->suspended = 1;
 266         /* strobe 0 is the power key so this can't be made an input for
 267            powersaving therefore i = 1 */
 268         for (i = 1; i < CORGI_KEY_STROBE_NUM; i++)
 269                 pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_IN);
 270
 271         return 0;
 272 }
 273
 274 static int corgikbd_resume(struct platform_device *dev)
 275 {
 276         int i;
 277         struct corgikbd *corgikbd = platform_get_drvdata(dev);
 278
 279         for (i = 1; i < CORGI_KEY_STROBE_NUM; i++)
 280                 pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_OUT | GPIO_DFLT_HIGH);
 281
 282         /* Upon resume, ignore the suspend key for a short while */
 283         corgikbd->suspend_jiffies=jiffies;
 284         corgikbd->suspended = 0;
 285
 286         return 0;
 287 }
 288 #else
 289 #define corgikbd_suspend        NULL
 290 #define corgikbd_resume         NULL
 291 #endif
 292
 293 static int __init corgikbd_probe(struct platform_device *pdev)
 294 {
 295         struct corgikbd *corgikbd;
 296         struct input_dev *input_dev;
 297         int i;
 298
 299         corgikbd = kzalloc(sizeof(struct corgikbd), GFP_KERNEL);
 300         input_dev = input_allocate_device();
 301         if (!corgikbd || !input_dev) {
 302                 kfree(corgikbd);
 303                 input_free_device(input_dev);
 304                 return -ENOMEM;
 305         }
 306
 307         platform_set_drvdata(pdev, corgikbd);
 308
 309         corgikbd->input = input_dev;
 310         spin_lock_init(&corgikbd->lock);
 311
 312         /* Init Keyboard rescan timer */
 313         init_timer(&corgikbd->timer);
 314         corgikbd->timer.function = corgikbd_timer_callback;
 315         corgikbd->timer.data = (unsigned long) corgikbd;
 316
 317         /* Init Hinge Timer */
 318         init_timer(&corgikbd->htimer);
 319         corgikbd->htimer.function = corgikbd_hinge_timer;
 320         corgikbd->htimer.data = (unsigned long) corgikbd;
 321
 322         corgikbd->suspend_jiffies=jiffies;
 323
 324         memcpy(corgikbd->keycode, corgikbd_keycode, sizeof(corgikbd->keycode));
 325
 326         input_dev->name = "Corgi Keyboard";
 327         input_dev->phys = "corgikbd/input0";
 328         input_dev->id.bustype = BUS_HOST;
 329         input_dev->id.vendor = 0x0001;
 330         input_dev->id.product = 0x0001;
 331         input_dev->id.version = 0x0100;
 332         input_dev->cdev.dev = &pdev->dev;
 333         input_dev->private = corgikbd;
 334
 335         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_PWR) | BIT(EV_SW);
 336         input_dev->keycode = corgikbd->keycode;
 337         input_dev->keycodesize = sizeof(unsigned char);
 338         input_dev->keycodemax = ARRAY_SIZE(corgikbd_keycode);
 339
 340         for (i = 0; i < ARRAY_SIZE(corgikbd_keycode); i++)
 341                 set_bit(corgikbd->keycode[i], input_dev->keybit);
 342         clear_bit(0, input_dev->keybit);
 343         set_bit(SW_LID, input_dev->swbit);
 344         set_bit(SW_TABLET_MODE, input_dev->swbit);
 345         set_bit(SW_HEADPHONE_INSERT, input_dev->swbit);
 346
 347         input_register_device(corgikbd->input);
 348
 349         mod_timer(&corgikbd->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL));
 350
 351         /* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */
 352         for (i = 0; i < CORGI_KEY_SENSE_NUM; i++) {
 353                 pxa_gpio_mode(CORGI_GPIO_KEY_SENSE(i) | GPIO_IN);
 354                 if (request_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd_interrupt,
 355                                 SA_INTERRUPT | SA_TRIGGER_RISING,
 356                                 "corgikbd", corgikbd))
 357                         printk(KERN_WARNING "corgikbd: Can't get IRQ: %d!\n", i);
 358         }
 359
 360         /* Set Strobe lines as outputs - set high */
 361         for (i = 0; i < CORGI_KEY_STROBE_NUM; i++)
 362                 pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_OUT | GPIO_DFLT_HIGH);
 363
 364         /* Setup the headphone jack as an input */
 365         pxa_gpio_mode(CORGI_GPIO_AK_INT | GPIO_IN);
 366
 367         return 0;
 368 }
 369
 370 static int corgikbd_remove(struct platform_device *pdev)
 371 {
 372         int i;
 373         struct corgikbd *corgikbd = platform_get_drvdata(pdev);
 374
 375         for (i = 0; i < CORGI_KEY_SENSE_NUM; i++)
 376                 free_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd);
 377
 378         del_timer_sync(&corgikbd->htimer);
 379         del_timer_sync(&corgikbd->timer);
 380
 381         input_unregister_device(corgikbd->input);
 382
 383         kfree(corgikbd);
 384
 385         return 0;
 386 }
 387
 388 static struct platform_driver corgikbd_driver = {
 389         .probe          = corgikbd_probe,
 390         .remove         = corgikbd_remove,
 391         .suspend        = corgikbd_suspend,
 392         .resume         = corgikbd_resume,
 393         .driver         = {
 394                 .name   = "corgi-keyboard",
 395         },
 396 };
 397
 398 static int __devinit 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("GPLv2");