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/device.h>
  16 #include <linux/init.h>
  17 #include <linux/input.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/module.h>
  20 #include <linux/slab.h>
  21 #include <asm/irq.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 + 3 hinge combinations */
  33 #define NR_SCANCODES            ( SCANCODE(KB_ROWS-1,KB_COLS-1) +1 +1 +3 )
  34 #define SCAN_INTERVAL           (HZ/10)
  35 #define CORGIKBD_PRESSED        1
  36
  37 #define HINGE_SCAN_INTERVAL             (HZ/4)
  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_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_OK            KEY_F11
  50 #define CORGI_KEY_MENU          KEY_F12
  51 #define CORGI_HINGE_0           KEY_KP0
  52 #define CORGI_HINGE_1           KEY_KP1
  53 #define CORGI_HINGE_2           KEY_KP2
  54
  55 static unsigned char corgikbd_keycode[NR_SCANCODES] = {
  56         0,                                                                                                                /* 0 */
  57         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 */
  58         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 */
  59         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 */
  60         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 */
  61         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 */
  62         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 */
  63         KEY_SYSRQ, CORGI_KEY_JAP1, CORGI_KEY_JAP2, KEY_CANCEL, CORGI_KEY_OK, CORGI_KEY_MENU, KEY_LEFT, KEY_DOWN, KEY_RIGHT, 0, 0, 0, 0, 0, 0, 0,  /* 97-112 */
  64         CORGI_KEY_OFF, CORGI_KEY_EXOK, CORGI_KEY_EXCANCEL, CORGI_KEY_EXJOGDOWN, CORGI_KEY_EXJOGUP, 0, 0, 0, 0, 0, 0, 0,   /* 113-124 */
  65         CORGI_HINGE_0, CORGI_HINGE_1, CORGI_HINGE_2       /* 125-127 */
  66 };
  67
  68
  69 struct corgikbd {
  70         unsigned char keycode[ARRAY_SIZE(corgikbd_keycode)];
  71         struct input_dev input;
  72         char phys[32];
  73
  74         unsigned char state[ARRAY_SIZE(corgikbd_keycode)];
  75         spinlock_t lock;
  76
  77         struct timer_list timer;
  78         struct timer_list htimer;
  79 };
  80
  81 static void handle_scancode(unsigned int pressed,unsigned int scancode, struct corgikbd *corgikbd_data)
  82 {
  83         if (pressed && !(corgikbd_data->state[scancode] & CORGIKBD_PRESSED)) {
  84                 corgikbd_data->state[scancode] |= CORGIKBD_PRESSED;
  85                 input_report_key(&corgikbd_data->input, corgikbd_data->keycode[scancode], 1);
  86                 if (corgikbd_data->keycode[scancode] == CORGI_KEY_OFF)
  87                         input_event(&corgikbd_data->input, EV_PWR, CORGI_KEY_OFF, 1);
  88         } else if (!pressed && corgikbd_data->state[scancode] & CORGIKBD_PRESSED) {
  89                 corgikbd_data->state[scancode] &= ~CORGIKBD_PRESSED;
  90                 input_report_key(&corgikbd_data->input, corgikbd_data->keycode[scancode], 0);
  91         }
  92 }
  93
  94 #define KB_DISCHARGE_DELAY      10
  95 #define KB_ACTIVATE_DELAY       10
  96
  97 /* Helper functions for reading the keyboard matrix
  98  * Note: We should really be using pxa_gpio_mode to alter GPDR but it
  99  *       requires a function call per GPIO bit which is excessive
 100  *       when we need to access 12 bits at once multiple times.
 101  * These functions must be called within local_irq_save()/local_irq_restore()
 102  * or similar.
 103  */
 104 static inline void corgikbd_discharge_all(void)
 105 {
 106         // STROBE All HiZ
 107         GPCR2  = CORGI_GPIO_ALL_STROBE_BIT;
 108         GPDR2 &= ~CORGI_GPIO_ALL_STROBE_BIT;
 109 }
 110
 111 static inline void corgikbd_activate_all(void)
 112 {
 113         // STROBE ALL -> High
 114         GPSR2  = CORGI_GPIO_ALL_STROBE_BIT;
 115         GPDR2 |= CORGI_GPIO_ALL_STROBE_BIT;
 116
 117         udelay(KB_DISCHARGE_DELAY);
 118
 119         // Clear any interrupts we may have triggered when altering the GPIO lines
 120         GEDR1 = CORGI_GPIO_HIGH_SENSE_BIT;
 121         GEDR2 = CORGI_GPIO_LOW_SENSE_BIT;
 122 }
 123
 124 static inline void corgikbd_activate_col(int col)
 125 {
 126         // STROBE col -> High, not col -> HiZ
 127         GPSR2 = CORGI_GPIO_STROBE_BIT(col);
 128         GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);
 129 }
 130
 131 static inline void corgikbd_reset_col(int col)
 132 {
 133         // STROBE col -> Low
 134         GPCR2 = CORGI_GPIO_STROBE_BIT(col);
 135         // STROBE col -> out, not col -> HiZ
 136         GPDR2 = (GPDR2 & ~CORGI_GPIO_ALL_STROBE_BIT) | CORGI_GPIO_STROBE_BIT(col);
 137 }
 138
 139 #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))
 140
 141 /*
 142  * The corgi keyboard only generates interrupts when a key is pressed.
 143  * When a key is pressed, we enable a timer which then scans the
 144  * keyboard to detect when the key is released.
 145  */
 146
 147 /* Scan the hardware keyboard and push any changes up through the input layer */
 148 static void corgikbd_scankeyboard(struct corgikbd *corgikbd_data, struct pt_regs *regs)
 149 {
 150         unsigned int row, col, rowd, scancode;
 151         unsigned long flags;
 152         unsigned int num_pressed;
 153
 154         spin_lock_irqsave(&corgikbd_data->lock, flags);
 155
 156         if (regs)
 157                 input_regs(&corgikbd_data->input, regs);
 158
 159         num_pressed = 0;
 160         for (col = 0; col < KB_COLS; col++) {
 161                 /*
 162                  * Discharge the output driver capacitatance
 163                  * in the keyboard matrix. (Yes it is significant..)
 164                  */
 165
 166                 corgikbd_discharge_all();
 167                 udelay(KB_DISCHARGE_DELAY);
 168
 169                 corgikbd_activate_col(col);
 170                 udelay(KB_ACTIVATE_DELAY);
 171
 172                 rowd = GET_ROWS_STATUS(col);
 173                 for (row = 0; row < KB_ROWS; row++) {
 174                         scancode = SCANCODE(row, col);
 175                         handle_scancode((rowd & KB_ROWMASK(row)), scancode, corgikbd_data);
 176                         if (rowd & KB_ROWMASK(row))
 177                                 num_pressed++;
 178                 }
 179                 corgikbd_reset_col(col);
 180         }
 181
 182         corgikbd_activate_all();
 183
 184         input_sync(&corgikbd_data->input);
 185
 186         /* if any keys are pressed, enable the timer */
 187         if (num_pressed)
 188                 mod_timer(&corgikbd_data->timer, jiffies + SCAN_INTERVAL);
 189
 190         spin_unlock_irqrestore(&corgikbd_data->lock, flags);
 191 }
 192
 193 /*
 194  * corgi keyboard interrupt handler.
 195  */
 196 static irqreturn_t corgikbd_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 197 {
 198         struct corgikbd *corgikbd_data = dev_id;
 199
 200         if (!timer_pending(&corgikbd_data->timer)) {
 201                 /** wait chattering delay **/
 202                 udelay(20);
 203                 corgikbd_scankeyboard(corgikbd_data, regs);
 204         }
 205
 206         return IRQ_HANDLED;
 207 }
 208
 209 /*
 210  * corgi timer checking for released keys
 211  */
 212 static void corgikbd_timer_callback(unsigned long data)
 213 {
 214         struct corgikbd *corgikbd_data = (struct corgikbd *) data;
 215         corgikbd_scankeyboard(corgikbd_data, NULL);
 216 }
 217
 218 /*
 219  * The hinge switches generate no interrupt so they need to be
 220  * monitored by a timer.
 221  *
 222  * When we detect changes, we debounce it and then pass the three
 223  * positions the system can take as keypresses to the input system.
 224  */
 225
 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(SCOOP_GPRR) & (CORGI_SCP_SWA | CORGI_SCP_SWB);
 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                         handle_scancode((sharpsl_hinge_state == 0x00), 125, corgikbd_data); /* Keyboard with Landscape Screen */
 246                         handle_scancode((sharpsl_hinge_state == 0x08), 126, corgikbd_data); /* No Keyboard with Portrait Screen */
 247                         handle_scancode((sharpsl_hinge_state == 0x0c), 127, corgikbd_data); /* Keyboard and Screen Closed  */
 248                         input_sync(&corgikbd_data->input);
 249
 250                         spin_unlock_irqrestore(&corgikbd_data->lock, flags);
 251                 }
 252         }
 253         mod_timer(&corgikbd_data->htimer, jiffies + HINGE_SCAN_INTERVAL);
 254 }
 255
 256 static int __init corgikbd_probe(struct device *dev)
 257 {
 258         int i;
 259         struct corgikbd *corgikbd;
 260
 261         corgikbd = kcalloc(1, sizeof(struct corgikbd), GFP_KERNEL);
 262         if (!corgikbd)
 263                 return -ENOMEM;
 264
 265         dev_set_drvdata(dev,corgikbd);
 266         strcpy(corgikbd->phys, "corgikbd/input0");
 267
 268         spin_lock_init(corgikbd->lock);
 269
 270         /* Init Keyboard rescan timer */
 271         init_timer(&corgikbd->timer);
 272         corgikbd->timer.function = corgikbd_timer_callback;
 273         corgikbd->timer.data = (unsigned long) corgikbd;
 274
 275         /* Init Hinge Timer */
 276         init_timer(&corgikbd->htimer);
 277         corgikbd->htimer.function = corgikbd_hinge_timer;
 278         corgikbd->htimer.data = (unsigned long) corgikbd;
 279
 280         init_input_dev(&corgikbd->input);
 281         corgikbd->input.private = corgikbd;
 282         corgikbd->input.name = "Corgi Keyboard";
 283         corgikbd->input.dev = dev;
 284         corgikbd->input.phys = corgikbd->phys;
 285         corgikbd->input.id.bustype = BUS_HOST;
 286         corgikbd->input.id.vendor = 0x0001;
 287         corgikbd->input.id.product = 0x0001;
 288         corgikbd->input.id.version = 0x0100;
 289         corgikbd->input.evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_PWR);
 290         corgikbd->input.keycode = corgikbd->keycode;
 291         corgikbd->input.keycodesize = sizeof(unsigned char);
 292         corgikbd->input.keycodemax = ARRAY_SIZE(corgikbd_keycode);
 293
 294         memcpy(corgikbd->keycode, corgikbd_keycode, sizeof(corgikbd->keycode));
 295         for (i = 0; i < ARRAY_SIZE(corgikbd_keycode); i++)
 296                 set_bit(corgikbd->keycode[i], corgikbd->input.keybit);
 297         clear_bit(0, corgikbd->input.keybit);
 298
 299         input_register_device(&corgikbd->input);
 300         mod_timer(&corgikbd->htimer, jiffies + HINGE_SCAN_INTERVAL);
 301
 302         /* Setup sense interrupts - RisingEdge Detect, sense lines as inputs */
 303         for (i = 0; i < CORGI_KEY_SENSE_NUM; i++) {
 304                 pxa_gpio_mode(CORGI_GPIO_KEY_SENSE(i) | GPIO_IN);
 305                 if (request_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd_interrupt,
 306                                                 SA_INTERRUPT, "corgikbd", corgikbd))
 307                         printk(KERN_WARNING "corgikbd: Can't get IRQ: %d!\n", i);
 308                 else
 309                         set_irq_type(CORGI_IRQ_GPIO_KEY_SENSE(i),IRQT_RISING);
 310         }
 311
 312         /* Set Strobe lines as outputs - set high */
 313         for (i = 0; i < CORGI_KEY_STROBE_NUM; i++)
 314                 pxa_gpio_mode(CORGI_GPIO_KEY_STROBE(i) | GPIO_OUT | GPIO_DFLT_HIGH);
 315
 316         printk(KERN_INFO "input: Corgi Keyboard Registered\n");
 317
 318         return 0;
 319 }
 320
 321 static int corgikbd_remove(struct device *dev)
 322 {
 323         int i;
 324         struct corgikbd *corgikbd = dev_get_drvdata(dev);
 325
 326         for (i = 0; i < CORGI_KEY_SENSE_NUM; i++)
 327                 free_irq(CORGI_IRQ_GPIO_KEY_SENSE(i), corgikbd);
 328
 329         del_timer_sync(&corgikbd->htimer);
 330         del_timer_sync(&corgikbd->timer);
 331
 332         input_unregister_device(&corgikbd->input);
 333
 334         kfree(corgikbd);
 335
 336         return 0;
 337 }
 338
 339 static struct device_driver corgikbd_driver = {
 340         .name           = "corgi-keyboard",
 341         .bus            = &platform_bus_type,
 342         .probe          = corgikbd_probe,
 343         .remove         = corgikbd_remove,
 344 };
 345
 346 static int __devinit corgikbd_init(void)
 347 {
 348         return driver_register(&corgikbd_driver);
 349 }
 350
 351 static void __exit corgikbd_exit(void)
 352 {
 353         driver_unregister(&corgikbd_driver);
 354 }
 355
 356 module_init(corgikbd_init);
 357 module_exit(corgikbd_exit);
 358
 359 MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
 360 MODULE_DESCRIPTION("Corgi Keyboard Driver");
 361 MODULE_LICENSE("GPLv2");