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)
 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         num_pressed = 0;
 144         for (col = 0; col < KB_COLS; col++) {
 145                 /*
 146                  * Discharge the output driver capacitatance
 147                  * in the keyboard matrix. (Yes it is significant..)
 148                  */
 149
 150                 corgikbd_discharge_all();
 151                 udelay(KB_DISCHARGE_DELAY);
 152
 153                 corgikbd_activate_col(col);
 154                 udelay(KB_ACTIVATE_DELAY);
 155
 156                 rowd = GET_ROWS_STATUS(col);
 157                 for (row = 0; row < KB_ROWS; row++) {
 158                         unsigned int scancode, pressed;
 159
 160                         scancode = SCANCODE(row, col);
 161                         pressed = rowd & KB_ROWMASK(row);
 162
 163                         input_report_key(corgikbd_data->input, corgikbd_data->keycode[scancode], pressed);
 164
 165                         if (pressed)
 166                                 num_pressed++;
 167
 168                         if (pressed && (corgikbd_data->keycode[scancode] == CORGI_KEY_OFF)
 169                                         && time_after(jiffies, corgikbd_data->suspend_jiffies + HZ)) {
 170                                 input_event(corgikbd_data->input, EV_PWR, CORGI_KEY_OFF, 1);
 171                                 corgikbd_data->suspend_jiffies=jiffies;
 172                         }
 173                 }
 174                 corgikbd_reset_col(col);
 175         }
 176
 177         corgikbd_activate_all();
 178
 179         input_sync(corgikbd_data->input);
 180
 181         /* if any keys are pressed, enable the timer */
 182         if (num_pressed)
 183                 mod_timer(&corgikbd_data->timer, jiffies + msecs_to_jiffies(SCAN_INTERVAL));
 184
 185         spin_unlock_irqrestore(&corgikbd_data->lock, flags);
 186 }
 187
 188 /*
 189  * corgi keyboard interrupt handler.
 190  */
 191 static irqreturn_t corgikbd_interrupt(int irq, void *dev_id)
 192 {
 193         struct corgikbd *corgikbd_data = dev_id;
 194
 195         if (!timer_pending(&corgikbd_data->timer)) {
 196                 /** wait chattering delay **/
 197                 udelay(20);
 198                 corgikbd_scankeyboard(corgikbd_data);
 199         }
 200
 201         return IRQ_HANDLED;
 202 }
 203
 204 /*
 205  * corgi timer checking for released keys
 206  */
 207 static void corgikbd_timer_callback(unsigned long data)
 208 {
 209         struct corgikbd *corgikbd_data = (struct corgikbd *) data;
 210         corgikbd_scankeyboard(corgikbd_data);
 211 }
 212
 213 /*
 214  * The hinge switches generate no interrupt so they need to be
 215  * monitored by a timer.
 216  *
 217  * We debounce the switches and pass them to the input system.
 218  *
 219  *  gprr == 0x00 - Keyboard with Landscape Screen
 220  *          0x08 - No Keyboard with Portrait Screen
 221  *          0x0c - Keyboard and Screen Closed
 222  */
 223
 224 #define READ_GPIO_BIT(x)    (GPLR(x) & GPIO_bit(x))
 225 #define HINGE_STABLE_COUNT 2
 226 static int sharpsl_hinge_state;
 227 static int hinge_count;
 228
 229 static void corgikbd_hinge_timer(unsigned long data)
 230 {
 231         struct corgikbd *corgikbd_data = (struct corgikbd *) data;
 232         unsigned long gprr;
 233         unsigned long flags;
 234
 235         gprr = read_scoop_reg(&corgiscoop_device.dev, SCOOP_GPRR) & (CORGI_SCP_SWA | CORGI_SCP_SWB);
 236         gprr |= (READ_GPIO_BIT(CORGI_GPIO_AK_INT) != 0);
 237         if (gprr != sharpsl_hinge_state) {
 238                 hinge_count = 0;
 239                 sharpsl_hinge_state = gprr;
 240         } else if (hinge_count < HINGE_STABLE_COUNT) {
 241                 hinge_count++;
 242                 if (hinge_count >= HINGE_STABLE_COUNT) {
 243                         spin_lock_irqsave(&corgikbd_data->lock, flags);
 244
 245                         input_report_switch(corgikbd_data->input, SW_LID, ((sharpsl_hinge_state & CORGI_SCP_SWA) != 0));
 246                         input_report_switch(corgikbd_data->input, SW_TABLET_MODE, ((sharpsl_hinge_state & CORGI_SCP_SWB) != 0));
 247                         input_report_switch(corgikbd_data->input, SW_HEADPHONE_INSERT, (READ_GPIO_BIT(CORGI_GPIO_AK_INT) != 0));
 248                         input_sync(corgikbd_data->input);
 249
 250                         spin_unlock_irqrestore(&corgikbd_data->lock, flags);
 251                 }
 252         }
 253         mod_timer(&corgikbd_data->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL));
 254 }
 255
 256 #ifdef CONFIG_PM
 257 static int corgikbd_suspend(struct platform_device *dev, pm_message_t state)
 258 {
 259         int i;
 260         struct corgikbd *corgikbd = platform_get_drvdata(dev);
 261
 262         corgikbd->suspended = 1;
 263         /* strobe 0 is the power key so this can't be made an input for
 264            powersaving therefore i = 1 */
 265         for (i = 1; i < CORGI_KEY_STROBE_NUM; i++)
 266                 pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_IN);
 267
 268         return 0;
 269 }
 270
 271 static int corgikbd_resume(struct platform_device *dev)
 272 {
 273         int i;
 274         struct corgikbd *corgikbd = platform_get_drvdata(dev);
 275
 276         for (i = 1; i < CORGI_KEY_STROBE_NUM; i++)
 277                 pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_OUT | GPIO_DFLT_HIGH);
 278
 279         /* Upon resume, ignore the suspend key for a short while */
 280         corgikbd->suspend_jiffies=jiffies;
 281         corgikbd->suspended = 0;
 282
 283         return 0;
 284 }
 285 #else
 286 #define corgikbd_suspend        NULL
 287 #define corgikbd_resume         NULL
 288 #endif
 289
 290 static int __init corgikbd_probe(struct platform_device *pdev)
 291 {
 292         struct corgikbd *corgikbd;
 293         struct input_dev *input_dev;
 294         int i, err = -ENOMEM;
 295
 296         corgikbd = kzalloc(sizeof(struct corgikbd), GFP_KERNEL);
 297         input_dev = input_allocate_device();
 298         if (!corgikbd || !input_dev)
 299                 goto fail;
 300
 301         platform_set_drvdata(pdev, corgikbd);
 302
 303         corgikbd->input = input_dev;
 304         spin_lock_init(&corgikbd->lock);
 305
 306         /* Init Keyboard rescan timer */
 307         init_timer(&corgikbd->timer);
 308         corgikbd->timer.function = corgikbd_timer_callback;
 309         corgikbd->timer.data = (unsigned long) corgikbd;
 310
 311         /* Init Hinge Timer */
 312         init_timer(&corgikbd->htimer);
 313         corgikbd->htimer.function = corgikbd_hinge_timer;
 314         corgikbd->htimer.data = (unsigned long) corgikbd;
 315
 316         corgikbd->suspend_jiffies=jiffies;
 317
 318         memcpy(corgikbd->keycode, corgikbd_keycode, sizeof(corgikbd->keycode));
 319
 320         input_dev->name = "Corgi Keyboard";
 321         input_dev->phys = "corgikbd/input0";
 322         input_dev->id.bustype = BUS_HOST;
 323         input_dev->id.vendor = 0x0001;
 324         input_dev->id.product = 0x0001;
 325         input_dev->id.version = 0x0100;
 326         input_dev->cdev.dev = &pdev->dev;
 327         input_dev->private = corgikbd;
 328
 329         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_PWR) | BIT(EV_SW);
 330         input_dev->keycode = corgikbd->keycode;
 331         input_dev->keycodesize = sizeof(unsigned char);
 332         input_dev->keycodemax = ARRAY_SIZE(corgikbd_keycode);
 333
 334         for (i = 0; i < ARRAY_SIZE(corgikbd_keycode); i++)
 335                 set_bit(corgikbd->keycode[i], input_dev->keybit);
 336         clear_bit(0, input_dev->keybit);
 337         set_bit(SW_LID, input_dev->swbit);
 338         set_bit(SW_TABLET_MODE, input_dev->swbit);
 339         set_bit(SW_HEADPHONE_INSERT, input_dev->swbit);
 340
 341         err = input_register_device(corgikbd->input);
 342         if (err)
 343                 goto fail;
 344
 345         mod_timer(&corgikbd->htimer, jiffies + msecs_to_jiffies(HINGE_SCAN_INTERVAL));
 346
 347         /* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */
 348         for (i = 0; i < CORGI_KEY_SENSE_NUM; i++) {
 349                 pxa_gpio_mode(CORGI_GPIO_KEY_SENSE(i) | GPIO_IN);
 350                 if (request_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd_interrupt,
 351                                 IRQF_DISABLED | IRQF_TRIGGER_RISING,
 352                                 "corgikbd", corgikbd))
 353                         printk(KERN_WARNING "corgikbd: Can't get IRQ: %d!\n", i);
 354         }
 355
 356         /* Set Strobe lines as outputs - set high */
 357         for (i = 0; i < CORGI_KEY_STROBE_NUM; i++)
 358                 pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_OUT | GPIO_DFLT_HIGH);
 359
 360         /* Setup the headphone jack as an input */
 361         pxa_gpio_mode(CORGI_GPIO_AK_INT | GPIO_IN);
 362
 363         return 0;
 364
 365  fail:  input_free_device(input_dev);
 366         kfree(corgikbd);
 367         return err;
 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");