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 #include <linux/clk.h>
  27 #include <linux/err.h>
  28
  29 #include <asm/mach-types.h>
  30 #include <asm/mach/arch.h>
  31 #include <asm/mach/map.h>
  32
  33 #include <asm/arch/hardware.h>
  34 #include <asm/arch/pxa-regs.h>
  35 #include <asm/arch/irqs.h>
  36 #include <asm/arch/pxa27x_keyboard.h>
  37
  38 #define DRIVER_NAME             "pxa27x-keyboard"
  39
  40 #define KPASMKP(col)            (col/2 == 0 ? KPASMKP0 : \
  41                                  col/2 == 1 ? KPASMKP1 : \
  42                                  col/2 == 2 ? KPASMKP2 : KPASMKP3)
  43 #define KPASMKPx_MKC(row, col)  (1 << (row + 16 * (col % 2)))
  44
  45 static struct clk *pxakbd_clk;
  46
  47 static irqreturn_t pxakbd_irq_handler(int irq, void *dev_id)
  48 {
  49         struct platform_device *pdev = dev_id;
  50         struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
  51         struct input_dev *input_dev = platform_get_drvdata(pdev);
  52         unsigned long kpc = KPC;
  53         int p, row, col, rel;
  54
  55         if (kpc & KPC_DI) {
  56                 unsigned long kpdk = KPDK;
  57
  58                 if (!(kpdk & KPDK_DKP)) {
  59                         /* better luck next time */
  60                 } else if (kpc & KPC_REE0) {
  61                         unsigned long kprec = KPREC;
  62                         KPREC = 0x7f;
  63
  64                         if (kprec & KPREC_OF0)
  65                                 rel = (kprec & 0xff) + 0x7f;
  66                         else if (kprec & KPREC_UF0)
  67                                 rel = (kprec & 0xff) - 0x7f - 0xff;
  68                         else
  69                                 rel = (kprec & 0xff) - 0x7f;
  70
  71                         if (rel) {
  72                                 input_report_rel(input_dev, REL_WHEEL, rel);
  73                                 input_sync(input_dev);
  74                         }
  75                 }
  76         }
  77
  78         if (kpc & KPC_MI) {
  79                 /* report the status of every button */
  80                 for (row = 0; row < pdata->nr_rows; row++) {
  81                         for (col = 0; col < pdata->nr_cols; col++) {
  82                                 p = KPASMKP(col) & KPASMKPx_MKC(row, col) ?
  83                                         1 : 0;
  84                                 pr_debug("keycode %x - pressed %x\n",
  85                                                 pdata->keycodes[row][col], p);
  86                                 input_report_key(input_dev,
  87                                                 pdata->keycodes[row][col], p);
  88                         }
  89                 }
  90                 input_sync(input_dev);
  91         }
  92
  93         return IRQ_HANDLED;
  94 }
  95
  96 static int pxakbd_open(struct input_dev *dev)
  97 {
  98         /* Set keypad control register */
  99         KPC |= (KPC_ASACT |
 100                 KPC_MS_ALL |
 101                 (2 << 6) | KPC_REE0 | KPC_DK_DEB_SEL |
 102                 KPC_ME | KPC_MIE | KPC_DE | KPC_DIE);
 103
 104         KPC &= ~KPC_AS;         /* disable automatic scan */
 105         KPC &= ~KPC_IMKP;       /* do not ignore multiple keypresses */
 106
 107         /* Set rotary count to mid-point value */
 108         KPREC = 0x7F;
 109
 110         /* Enable unit clock */
 111         clk_enable(pxakbd_clk);
 112
 113         return 0;
 114 }
 115
 116 static void pxakbd_close(struct input_dev *dev)
 117 {
 118         /* Disable clock unit */
 119         clk_disable(pxakbd_clk);
 120 }
 121
 122 #ifdef CONFIG_PM
 123 static int pxakbd_suspend(struct platform_device *pdev, pm_message_t state)
 124 {
 125         struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
 126
 127         /* Save controller status */
 128         pdata->reg_kpc = KPC;
 129         pdata->reg_kprec = KPREC;
 130
 131         return 0;
 132 }
 133
 134 static int pxakbd_resume(struct platform_device *pdev)
 135 {
 136         struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
 137         struct input_dev *input_dev = platform_get_drvdata(pdev);
 138
 139         mutex_lock(&input_dev->mutex);
 140
 141         if (input_dev->users) {
 142                 /* Restore controller status */
 143                 KPC = pdata->reg_kpc;
 144                 KPREC = pdata->reg_kprec;
 145
 146                 /* Enable unit clock */
 147                 clk_disable(pxakbd_clk);
 148                 clk_enable(pxakbd_clk);
 149         }
 150
 151         mutex_unlock(&input_dev->mutex);
 152
 153         return 0;
 154 }
 155 #else
 156 #define pxakbd_suspend  NULL
 157 #define pxakbd_resume   NULL
 158 #endif
 159
 160 static int __devinit pxakbd_probe(struct platform_device *pdev)
 161 {
 162         struct pxa27x_keyboard_platform_data *pdata = pdev->dev.platform_data;
 163         struct input_dev *input_dev;
 164         int i, row, col, error;
 165
 166         pxakbd_clk = clk_get(&pdev->dev, "KBDCLK");
 167         if (IS_ERR(pxakbd_clk)) {
 168                 error = PTR_ERR(pxakbd_clk);
 169                 goto err_clk;
 170         }
 171
 172         /* Create and register the input driver. */
 173         input_dev = input_allocate_device();
 174         if (!input_dev) {
 175                 printk(KERN_ERR "Cannot request keypad device\n");
 176                 error = -ENOMEM;
 177                 goto err_alloc;
 178         }
 179
 180         input_dev->name = DRIVER_NAME;
 181         input_dev->id.bustype = BUS_HOST;
 182         input_dev->open = pxakbd_open;
 183         input_dev->close = pxakbd_close;
 184         input_dev->dev.parent = &pdev->dev;
 185
 186         input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP) | BIT(EV_REL);
 187         input_dev->relbit[LONG(REL_WHEEL)] = BIT(REL_WHEEL);
 188         for (row = 0; row < pdata->nr_rows; row++) {
 189                 for (col = 0; col < pdata->nr_cols; col++) {
 190                         int code = pdata->keycodes[row][col];
 191                         if (code > 0)
 192                                 set_bit(code, input_dev->keybit);
 193                 }
 194         }
 195
 196         error = request_irq(IRQ_KEYPAD, pxakbd_irq_handler, IRQF_DISABLED,
 197                             DRIVER_NAME, pdev);
 198         if (error) {
 199                 printk(KERN_ERR "Cannot request keypad IRQ\n");
 200                 goto err_free_dev;
 201         }
 202
 203         platform_set_drvdata(pdev, input_dev);
 204
 205         /* Register the input device */
 206         error = input_register_device(input_dev);
 207         if (error)
 208                 goto err_free_irq;
 209
 210         /* Setup GPIOs. */
 211         for (i = 0; i < pdata->nr_rows + pdata->nr_cols; i++)
 212                 pxa_gpio_mode(pdata->gpio_modes[i]);
 213
 214         /*
 215          * Store rows/cols info into keyboard registers.
 216          */
 217
 218         KPC |= (pdata->nr_rows - 1) << 26;
 219         KPC |= (pdata->nr_cols - 1) << 23;
 220
 221         for (col = 0; col < pdata->nr_cols; col++)
 222                 KPC |= KPC_MS0 << col;
 223
 224         return 0;
 225
 226  err_free_irq:
 227         platform_set_drvdata(pdev, NULL);
 228         free_irq(IRQ_KEYPAD, pdev);
 229  err_free_dev:
 230         input_free_device(input_dev);
 231  err_alloc:
 232         clk_put(pxakbd_clk);
 233  err_clk:
 234         return error;
 235 }
 236
 237 static int __devexit pxakbd_remove(struct platform_device *pdev)
 238 {
 239         struct input_dev *input_dev = platform_get_drvdata(pdev);
 240
 241         input_unregister_device(input_dev);
 242         free_irq(IRQ_KEYPAD, pdev);
 243         clk_put(pxakbd_clk);
 244         platform_set_drvdata(pdev, NULL);
 245
 246         return 0;
 247 }
 248
 249 static struct platform_driver pxakbd_driver = {
 250         .probe          = pxakbd_probe,
 251         .remove         = __devexit_p(pxakbd_remove),
 252         .suspend        = pxakbd_suspend,
 253         .resume         = pxakbd_resume,
 254         .driver         = {
 255                 .name   = DRIVER_NAME,
 256         },
 257 };
 258
 259 static int __init pxakbd_init(void)
 260 {
 261         return platform_driver_register(&pxakbd_driver);
 262 }
 263
 264 static void __exit pxakbd_exit(void)
 265 {
 266         platform_driver_unregister(&pxakbd_driver);
 267 }
 268
 269 module_init(pxakbd_init);
 270 module_exit(pxakbd_exit);
 271
 272 MODULE_DESCRIPTION("PXA27x Matrix Keyboard Driver");
 273 MODULE_LICENSE("GPL");