drivers/input/keyboard/pxa27x_keyboard.c

   1 /*
   2  * linux/drivers/input/keyboard/pxa27x_keyboard.c
   3  *
   4  * Driver for the pxa27x matrix keyboard controller.
   5  *
   6  * Created:     Feb 22, 2007
   7  * Author:      Rodolfo Giometti <giometti@linux.it>
   8  *
   9  * Based on a previous implementations by Kevin O'Connor
  10  * <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and
  11  * on some suggestions by Nicolas Pitre <nico@cam.org>.
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2 as
  15  * published by the Free Software Foundation.
  16  */
  17
  18
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/input.h>
  24 #include <linux/device.h>
  25 #include <linux/platform_device.h>
  26
  27 #include <asm/mach-types.h>
  28 #include <asm/mach/arch.h>
  29 #include <asm/mach/map.h>
  30
  31 #include <asm/arch/hardware.h>
  32 #include <asm/arch/pxa-regs.h>
  33 #include <asm/arch/irqs.h>
  34 #include <asm/arch/pxa27x_keyboard.h>
  35
  36 #define DRIVER_NAME             "pxa27x-keyboard"
  37
  38 #define KPASMKP(col)            (col/2 == 0 ? KPASMKP0 : \
  39                                  col/2 == 1 ? KPASMKP1 : \
  40                                  col/2 == 2 ? KPASMKP2 : KPASMKP3)
  41 #define KPASMKPx_MKC(row, col)  (1 << (row + 16 * (col % 2)))
  42
  43 static irqreturn_t pxakbd_irq_handler(int irq, void *dev_id)
  44 {
  45         struct platform_device *pdev = dev_id;
  46         struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
  47         struct input_dev *input_dev = platform_get_drvdata(pdev);
  48         unsigned long kpc = KPC;
  49         int p, row, col, rel;
  50
  51         if (kpc & KPC_DI) {
  52                 unsigned long kpdk = KPDK;
  53
  54                 if (!(kpdk & KPDK_DKP)) {
  55                         /* better luck next time */
  56                 } else if (kpc & KPC_REE0) {
  57                         unsigned long kprec = KPREC;
  58                         KPREC = 0x7f;
  59
  60                         if (kprec & KPREC_OF0)
  61                                 rel = (kprec & 0xff) + 0x7f;
  62                         else if (kprec & KPREC_UF0)
  63                                 rel = (kprec & 0xff) - 0x7f - 0xff;
  64                         else
  65                                 rel = (kprec & 0xff) - 0x7f;
  66
  67                         if (rel) {
  68                                 input_report_rel(input_dev, REL_WHEEL, rel);
  69                                 input_sync(input_dev);
  70                         }
  71                 }
  72         }
  73
  74         if (kpc & KPC_MI) {
  75                 /* report the status of every button */
  76                 for (row = 0; row < pdata->nr_rows; row++) {
  77                         for (col = 0; col < pdata->nr_cols; col++) {
  78                                 p = KPASMKP(col) & KPASMKPx_MKC(row, col) ?
  79                                         1 : 0;
  80                                 pr_debug("keycode %x - pressed %x\n",
  81                                                 pdata->keycodes[row][col], p);
  82                                 input_report_key(input_dev,
  83                                                 pdata->keycodes[row][col], p);
  84                         }
  85                 }
  86                 input_sync(input_dev);
  87         }
  88
  89         return IRQ_HANDLED;
  90 }
  91
  92 static int pxakbd_open(struct input_dev *dev)
  93 {
  94         /* Set keypad control register */
  95         KPC |= (KPC_ASACT |
  96                 KPC_MS_ALL |
  97                 (2 << 6) | KPC_REE0 | KPC_DK_DEB_SEL |
  98                 KPC_ME | KPC_MIE | KPC_DE | KPC_DIE);
  99
 100         KPC &= ~KPC_AS;         /* disable automatic scan */
 101         KPC &= ~KPC_IMKP;       /* do not ignore multiple keypresses */
 102
 103         /* Set rotary count to mid-point value */
 104         KPREC = 0x7F;
 105
 106         /* Enable unit clock */
 107         pxa_set_cken(CKEN19_KEYPAD, 1);
 108
 109         return 0;
 110 }
 111
 112 static void pxakbd_close(struct input_dev *dev)
 113 {
 114         /* Disable clock unit */
 115         pxa_set_cken(CKEN19_KEYPAD, 0);
 116 }
 117
 118 #ifdef CONFIG_PM
 119 static int pxakbd_suspend(struct platform_device *pdev, pm_message_t state)
 120 {
 121         struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
 122
 123         /* Save controller status */
 124         pdata->reg_kpc = KPC;
 125         pdata->reg_kprec = KPREC;
 126
 127         return 0;
 128 }
 129
 130 static int pxakbd_resume(struct platform_device *pdev)
 131 {
 132         struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
 133         struct input_dev *input_dev = platform_get_drvdata(pdev);
 134
 135         mutex_lock(&input_dev->mutex);
 136
 137         if (input_dev->users) {
 138                 /* Restore controller status */
 139                 KPC = pdata->reg_kpc;
 140                 KPREC = pdata->reg_kprec;
 141
 142                 /* Enable unit clock */
 143                 pxa_set_cken(CKEN19_KEYPAD, 1);
 144         }
 145
 146         mutex_unlock(&input_dev->mutex);
 147
 148         return 0;
 149 }
 150 #else
 151 #define pxakbd_suspend  NULL
 152 #define pxakbd_resume   NULL
 153 #endif
 154
 155 static int __devinit pxakbd_probe(struct platform_device *pdev)
 156 {
 157         struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
 158         struct input_dev *input_dev;
 159         int i, row, col, error;
 160
 161         /* Create and register the input driver. */
 162         input_dev = input_allocate_device();
 163         if (!input_dev) {
 164                 printk(KERN_ERR "Cannot request keypad device\n");
 165                 return -ENOMEM;
 166         }
 167
 168         input_dev->name = DRIVER_NAME;
 169         input_dev->id.bustype = BUS_HOST;
 170         input_dev->open = pxakbd_open;
 171         input_dev->close = pxakbd_close;
 172         input_dev->dev.parent = &pdev->dev;
 173
 174         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_REL);
 175         input_dev->relbit[LONG(REL_WHEEL)] = BIT(REL_WHEEL);
 176         for (row = 0; row < pdata->nr_rows; row++) {
 177                 for (col = 0; col < pdata->nr_cols; col++) {
 178                         int code = pdata->keycodes[row][col];
 179                         if (code > 0)
 180                                 set_bit(code, input_dev->keybit);
 181                 }
 182         }
 183
 184         error = request_irq(IRQ_KEYPAD, pxakbd_irq_handler, IRQF_DISABLED,
 185                             DRIVER_NAME, pdev);
 186         if (error) {
 187                 printk(KERN_ERR "Cannot request keypad IRQ\n");
 188                 pxa_set_cken(CKEN19_KEYPAD, 0);
 189                 goto err_free_dev;
 190         }
 191
 192         platform_set_drvdata(pdev, input_dev);
 193
 194         /* Register the input device */
 195         error = input_register_device(input_dev);
 196         if (error)
 197                 goto err_free_irq;
 198
 199         /* Setup GPIOs. */
 200         for (i = 0; i < pdata->nr_rows + pdata->nr_cols; i++)
 201                 pxa_gpio_mode(pdata->gpio_modes[i]);
 202
 203         /*
 204          * Store rows/cols info into keyboard registers.
 205          */
 206
 207         KPC |= (pdata->nr_rows - 1) << 26;
 208         KPC |= (pdata->nr_cols - 1) << 23;
 209
 210         for (col = 0; col < pdata->nr_cols; col++)
 211                 KPC |= KPC_MS0 << col;
 212
 213         return 0;
 214
 215  err_free_irq:
 216         platform_set_drvdata(pdev, NULL);
 217         free_irq(IRQ_KEYPAD, pdev);
 218  err_free_dev:
 219         input_free_device(input_dev);
 220         return error;
 221 }
 222
 223 static int __devexit pxakbd_remove(struct platform_device *pdev)
 224 {
 225         struct input_dev *input_dev = platform_get_drvdata(pdev);
 226
 227         input_unregister_device(input_dev);
 228         free_irq(IRQ_KEYPAD, pdev);
 229         platform_set_drvdata(pdev, NULL);
 230
 231         return 0;
 232 }
 233
 234 static struct platform_driver pxakbd_driver = {
 235         .probe          = pxakbd_probe,
 236         .remove         = __devexit_p(pxakbd_remove),
 237         .suspend        = pxakbd_suspend,
 238         .resume         = pxakbd_resume,
 239         .driver         = {
 240                 .name   = DRIVER_NAME,
 241         },
 242 };
 243
 244 static int __init pxakbd_init(void)
 245 {
 246         return platform_driver_register(&pxakbd_driver);
 247 }
 248
 249 static void __exit pxakbd_exit(void)
 250 {
 251         platform_driver_unregister(&pxakbd_driver);
 252 }
 253
 254 module_init(pxakbd_init);
 255 module_exit(pxakbd_exit);
 256
 257 MODULE_DESCRIPTION("PXA27x Matrix Keyboard Driver");
 258 MODULE_LICENSE("GPL");