drivers/input/keyboard/ep93xx_keypad.c

   1 /*
   2  * Driver for the Cirrus EP93xx matrix keypad controller.
   3  *
   4  * Copyright (c) 2008 H Hartley Sweeten <hsweeten@visionengravers.com>
   5  *
   6  * Based on the pxa27x matrix keypad controller by Rodolfo Giometti.
   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  * NOTE:
  13  *
  14  * The 3-key reset is triggered by pressing the 3 keys in
  15  * Row 0, Columns 2, 4, and 7 at the same time.  This action can
  16  * be disabled by setting the EP93XX_KEYPAD_DISABLE_3_KEY flag.
  17  *
  18  * Normal operation for the matrix does not autorepeat the key press.
  19  * This action can be enabled by setting the EP93XX_KEYPAD_AUTOREPEAT
  20  * flag.
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/clk.h>
  27 #include <linux/io.h>
  28 #include <linux/input/matrix_keypad.h>
  29 #include <linux/slab.h>
  30
  31 #include <mach/hardware.h>
  32 #include <linux/platform_data/keypad-ep93xx.h>
  33
  34 /*
  35  * Keypad Interface Register offsets
  36  */
  37 #define KEY_INIT                0x00    /* Key Scan Initialization register */
  38 #define KEY_DIAG                0x04    /* Key Scan Diagnostic register */
  39 #define KEY_REG                 0x08    /* Key Value Capture register */
  40
  41 /* Key Scan Initialization Register bit defines */
  42 #define KEY_INIT_DBNC_MASK      (0x00ff0000)
  43 #define KEY_INIT_DBNC_SHIFT     (16)
  44 #define KEY_INIT_DIS3KY         (1<<15)
  45 #define KEY_INIT_DIAG           (1<<14)
  46 #define KEY_INIT_BACK           (1<<13)
  47 #define KEY_INIT_T2             (1<<12)
  48 #define KEY_INIT_PRSCL_MASK     (0x000003ff)
  49 #define KEY_INIT_PRSCL_SHIFT    (0)
  50
  51 /* Key Scan Diagnostic Register bit defines */
  52 #define KEY_DIAG_MASK           (0x0000003f)
  53 #define KEY_DIAG_SHIFT          (0)
  54
  55 /* Key Value Capture Register bit defines */
  56 #define KEY_REG_K               (1<<15)
  57 #define KEY_REG_INT             (1<<14)
  58 #define KEY_REG_2KEYS           (1<<13)
  59 #define KEY_REG_1KEY            (1<<12)
  60 #define KEY_REG_KEY2_MASK       (0x00000fc0)
  61 #define KEY_REG_KEY2_SHIFT      (6)
  62 #define KEY_REG_KEY1_MASK       (0x0000003f)
  63 #define KEY_REG_KEY1_SHIFT      (0)
  64
  65 #define EP93XX_MATRIX_SIZE      (EP93XX_MATRIX_ROWS * EP93XX_MATRIX_COLS)
  66
  67 struct ep93xx_keypad {
  68         struct ep93xx_keypad_platform_data *pdata;
  69         struct input_dev *input_dev;
  70         struct clk *clk;
  71
  72         void __iomem *mmio_base;
  73
  74         unsigned short keycodes[EP93XX_MATRIX_SIZE];
  75
  76         int key1;
  77         int key2;
  78
  79         int irq;
  80
  81         bool enabled;
  82 };
  83
  84 static irqreturn_t ep93xx_keypad_irq_handler(int irq, void *dev_id)
  85 {
  86         struct ep93xx_keypad *keypad = dev_id;
  87         struct input_dev *input_dev = keypad->input_dev;
  88         unsigned int status;
  89         int keycode, key1, key2;
  90
  91         status = __raw_readl(keypad->mmio_base + KEY_REG);
  92
  93         keycode = (status & KEY_REG_KEY1_MASK) >> KEY_REG_KEY1_SHIFT;
  94         key1 = keypad->keycodes[keycode];
  95
  96         keycode = (status & KEY_REG_KEY2_MASK) >> KEY_REG_KEY2_SHIFT;
  97         key2 = keypad->keycodes[keycode];
  98
  99         if (status & KEY_REG_2KEYS) {
 100                 if (keypad->key1 && key1 != keypad->key1 && key2 != keypad->key1)
 101                         input_report_key(input_dev, keypad->key1, 0);
 102
 103                 if (keypad->key2 && key1 != keypad->key2 && key2 != keypad->key2)
 104                         input_report_key(input_dev, keypad->key2, 0);
 105
 106                 input_report_key(input_dev, key1, 1);
 107                 input_report_key(input_dev, key2, 1);
 108
 109                 keypad->key1 = key1;
 110                 keypad->key2 = key2;
 111
 112         } else if (status & KEY_REG_1KEY) {
 113                 if (keypad->key1 && key1 != keypad->key1)
 114                         input_report_key(input_dev, keypad->key1, 0);
 115
 116                 if (keypad->key2 && key1 != keypad->key2)
 117                         input_report_key(input_dev, keypad->key2, 0);
 118
 119                 input_report_key(input_dev, key1, 1);
 120
 121                 keypad->key1 = key1;
 122                 keypad->key2 = 0;
 123
 124         } else {
 125                 input_report_key(input_dev, keypad->key1, 0);
 126                 input_report_key(input_dev, keypad->key2, 0);
 127
 128                 keypad->key1 = keypad->key2 = 0;
 129         }
 130         input_sync(input_dev);
 131
 132         return IRQ_HANDLED;
 133 }
 134
 135 static void ep93xx_keypad_config(struct ep93xx_keypad *keypad)
 136 {
 137         struct ep93xx_keypad_platform_data *pdata = keypad->pdata;
 138         unsigned int val = 0;
 139
 140         if (pdata->flags & EP93XX_KEYPAD_KDIV)
 141                 clk_set_rate(keypad->clk, EP93XX_KEYTCHCLK_DIV4);
 142         else
 143                 clk_set_rate(keypad->clk, EP93XX_KEYTCHCLK_DIV16);
 144
 145         if (pdata->flags & EP93XX_KEYPAD_DISABLE_3_KEY)
 146                 val |= KEY_INIT_DIS3KY;
 147         if (pdata->flags & EP93XX_KEYPAD_DIAG_MODE)
 148                 val |= KEY_INIT_DIAG;
 149         if (pdata->flags & EP93XX_KEYPAD_BACK_DRIVE)
 150                 val |= KEY_INIT_BACK;
 151         if (pdata->flags & EP93XX_KEYPAD_TEST_MODE)
 152                 val |= KEY_INIT_T2;
 153
 154         val |= ((pdata->debounce << KEY_INIT_DBNC_SHIFT) & KEY_INIT_DBNC_MASK);
 155
 156         val |= ((pdata->prescale << KEY_INIT_PRSCL_SHIFT) & KEY_INIT_PRSCL_MASK);
 157
 158         __raw_writel(val, keypad->mmio_base + KEY_INIT);
 159 }
 160
 161 static int ep93xx_keypad_open(struct input_dev *pdev)
 162 {
 163         struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
 164
 165         if (!keypad->enabled) {
 166                 ep93xx_keypad_config(keypad);
 167                 clk_enable(keypad->clk);
 168                 keypad->enabled = true;
 169         }
 170
 171         return 0;
 172 }
 173
 174 static void ep93xx_keypad_close(struct input_dev *pdev)
 175 {
 176         struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
 177
 178         if (keypad->enabled) {
 179                 clk_disable(keypad->clk);
 180                 keypad->enabled = false;
 181         }
 182 }
 183
 184
 185 #ifdef CONFIG_PM_SLEEP
 186 static int ep93xx_keypad_suspend(struct device *dev)
 187 {
 188         struct platform_device *pdev = to_platform_device(dev);
 189         struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
 190         struct input_dev *input_dev = keypad->input_dev;
 191
 192         mutex_lock(&input_dev->mutex);
 193
 194         if (keypad->enabled) {
 195                 clk_disable(keypad->clk);
 196                 keypad->enabled = false;
 197         }
 198
 199         mutex_unlock(&input_dev->mutex);
 200
 201         if (device_may_wakeup(&pdev->dev))
 202                 enable_irq_wake(keypad->irq);
 203
 204         return 0;
 205 }
 206
 207 static int ep93xx_keypad_resume(struct device *dev)
 208 {
 209         struct platform_device *pdev = to_platform_device(dev);
 210         struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
 211         struct input_dev *input_dev = keypad->input_dev;
 212
 213         if (device_may_wakeup(&pdev->dev))
 214                 disable_irq_wake(keypad->irq);
 215
 216         mutex_lock(&input_dev->mutex);
 217
 218         if (input_dev->users) {
 219                 if (!keypad->enabled) {
 220                         ep93xx_keypad_config(keypad);
 221                         clk_enable(keypad->clk);
 222                         keypad->enabled = true;
 223                 }
 224         }
 225
 226         mutex_unlock(&input_dev->mutex);
 227
 228         return 0;
 229 }
 230 #endif
 231
 232 static SIMPLE_DEV_PM_OPS(ep93xx_keypad_pm_ops,
 233                          ep93xx_keypad_suspend, ep93xx_keypad_resume);
 234
 235 static int ep93xx_keypad_probe(struct platform_device *pdev)
 236 {
 237         struct ep93xx_keypad *keypad;
 238         const struct matrix_keymap_data *keymap_data;
 239         struct input_dev *input_dev;
 240         struct resource *res;
 241         int err;
 242
 243         keypad = kzalloc(sizeof(struct ep93xx_keypad), GFP_KERNEL);
 244         if (!keypad)
 245                 return -ENOMEM;
 246
 247         keypad->pdata = dev_get_platdata(&pdev->dev);
 248         if (!keypad->pdata) {
 249                 err = -EINVAL;
 250                 goto failed_free;
 251         }
 252
 253         keymap_data = keypad->pdata->keymap_data;
 254         if (!keymap_data) {
 255                 err = -EINVAL;
 256                 goto failed_free;
 257         }
 258
 259         keypad->irq = platform_get_irq(pdev, 0);
 260         if (!keypad->irq) {
 261                 err = -ENXIO;
 262                 goto failed_free;
 263         }
 264
 265         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 266         if (!res) {
 267                 err = -ENXIO;
 268                 goto failed_free;
 269         }
 270
 271         res = request_mem_region(res->start, resource_size(res), pdev->name);
 272         if (!res) {
 273                 err = -EBUSY;
 274                 goto failed_free;
 275         }
 276
 277         keypad->mmio_base = ioremap(res->start, resource_size(res));
 278         if (keypad->mmio_base == NULL) {
 279                 err = -ENXIO;
 280                 goto failed_free_mem;
 281         }
 282
 283         err = ep93xx_keypad_acquire_gpio(pdev);
 284         if (err)
 285                 goto failed_free_io;
 286
 287         keypad->clk = clk_get(&pdev->dev, NULL);
 288         if (IS_ERR(keypad->clk)) {
 289                 err = PTR_ERR(keypad->clk);
 290                 goto failed_free_gpio;
 291         }
 292
 293         input_dev = input_allocate_device();
 294         if (!input_dev) {
 295                 err = -ENOMEM;
 296                 goto failed_put_clk;
 297         }
 298
 299         keypad->input_dev = input_dev;
 300
 301         input_dev->name = pdev->name;
 302         input_dev->id.bustype = BUS_HOST;
 303         input_dev->open = ep93xx_keypad_open;
 304         input_dev->close = ep93xx_keypad_close;
 305         input_dev->dev.parent = &pdev->dev;
 306
 307         err = matrix_keypad_build_keymap(keymap_data, NULL,
 308                                          EP93XX_MATRIX_ROWS, EP93XX_MATRIX_COLS,
 309                                          keypad->keycodes, input_dev);
 310         if (err)
 311                 goto failed_free_dev;
 312
 313         if (keypad->pdata->flags & EP93XX_KEYPAD_AUTOREPEAT)
 314                 __set_bit(EV_REP, input_dev->evbit);
 315         input_set_drvdata(input_dev, keypad);
 316
 317         err = request_irq(keypad->irq, ep93xx_keypad_irq_handler,
 318                           0, pdev->name, keypad);
 319         if (err)
 320                 goto failed_free_dev;
 321
 322         err = input_register_device(input_dev);
 323         if (err)
 324                 goto failed_free_irq;
 325
 326         platform_set_drvdata(pdev, keypad);
 327         device_init_wakeup(&pdev->dev, 1);
 328
 329         return 0;
 330
 331 failed_free_irq:
 332         free_irq(keypad->irq, keypad);
 333 failed_free_dev:
 334         input_free_device(input_dev);
 335 failed_put_clk:
 336         clk_put(keypad->clk);
 337 failed_free_gpio:
 338         ep93xx_keypad_release_gpio(pdev);
 339 failed_free_io:
 340         iounmap(keypad->mmio_base);
 341 failed_free_mem:
 342         release_mem_region(res->start, resource_size(res));
 343 failed_free:
 344         kfree(keypad);
 345         return err;
 346 }
 347
 348 static int ep93xx_keypad_remove(struct platform_device *pdev)
 349 {
 350         struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
 351         struct resource *res;
 352
 353         free_irq(keypad->irq, keypad);
 354
 355         if (keypad->enabled)
 356                 clk_disable(keypad->clk);
 357         clk_put(keypad->clk);
 358
 359         input_unregister_device(keypad->input_dev);
 360
 361         ep93xx_keypad_release_gpio(pdev);
 362
 363         iounmap(keypad->mmio_base);
 364
 365         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 366         release_mem_region(res->start, resource_size(res));
 367
 368         kfree(keypad);
 369
 370         return 0;
 371 }
 372
 373 static struct platform_driver ep93xx_keypad_driver = {
 374         .driver         = {
 375                 .name   = "ep93xx-keypad",
 376                 .pm     = &ep93xx_keypad_pm_ops,
 377         },
 378         .probe          = ep93xx_keypad_probe,
 379         .remove         = ep93xx_keypad_remove,
 380 };
 381 module_platform_driver(ep93xx_keypad_driver);
 382
 383 MODULE_LICENSE("GPL");
 384 MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
 385 MODULE_DESCRIPTION("EP93xx Matrix Keypad Controller");
 386 MODULE_ALIAS("platform:ep93xx-keypad");