drivers/input/keyboard/w90p910_keypad.c

   1 /*
   2  * Copyright (c) 2008-2009 Nuvoton technology corporation.
   3  *
   4  * Wan ZongShun <mcuos.com@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation;version 2 of the License.
   9  *
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/input.h>
  17 #include <linux/device.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/clk.h>
  20 #include <linux/err.h>
  21 #include <linux/io.h>
  22
  23 #include <mach/w90p910_keypad.h>
  24
  25 /* Keypad Interface Control Registers */
  26 #define KPI_CONF                0x00
  27 #define KPI_3KCONF              0x04
  28 #define KPI_LPCONF              0x08
  29 #define KPI_STATUS              0x0C
  30
  31 #define IS1KEY                  (0x01 << 16)
  32 #define INTTR                   (0x01 << 21)
  33 #define KEY0R                   (0x0f << 3)
  34 #define KEY0C                   0x07
  35 #define DEBOUNCE_BIT            0x08
  36 #define KSIZE0                  (0x01 << 16)
  37 #define KSIZE1                  (0x01 << 17)
  38 #define KPSEL                   (0x01 << 19)
  39 #define ENKP                    (0x01 << 18)
  40
  41 #define KGET_RAW(n)             (((n) & KEY0R) >> 3)
  42 #define KGET_COLUMN(n)          ((n) & KEY0C)
  43
  44 #define W90P910_MAX_KEY_NUM     (8 * 8)
  45 #define W90P910_ROW_SHIFT       3
  46
  47 struct w90p910_keypad {
  48         const struct w90p910_keypad_platform_data *pdata;
  49         struct clk *clk;
  50         struct input_dev *input_dev;
  51         void __iomem *mmio_base;
  52         int irq;
  53         unsigned short keymap[W90P910_MAX_KEY_NUM];
  54 };
  55
  56 static void w90p910_keypad_scan_matrix(struct w90p910_keypad *keypad,
  57                                                         unsigned int status)
  58 {
  59         struct input_dev *input_dev = keypad->input_dev;
  60         unsigned int row = KGET_RAW(status);
  61         unsigned int col = KGET_COLUMN(status);
  62         unsigned int code = MATRIX_SCAN_CODE(row, col, W90P910_ROW_SHIFT);
  63         unsigned int key = keypad->keymap[code];
  64
  65         input_event(input_dev, EV_MSC, MSC_SCAN, code);
  66         input_report_key(input_dev, key, 1);
  67         input_sync(input_dev);
  68
  69         input_event(input_dev, EV_MSC, MSC_SCAN, code);
  70         input_report_key(input_dev, key, 0);
  71         input_sync(input_dev);
  72 }
  73
  74 static irqreturn_t w90p910_keypad_irq_handler(int irq, void *dev_id)
  75 {
  76         struct w90p910_keypad *keypad = dev_id;
  77         unsigned int  kstatus, val;
  78
  79         kstatus = __raw_readl(keypad->mmio_base + KPI_STATUS);
  80
  81         val = INTTR | IS1KEY;
  82
  83         if (kstatus & val)
  84                 w90p910_keypad_scan_matrix(keypad, kstatus);
  85
  86         return IRQ_HANDLED;
  87 }
  88
  89 static int w90p910_keypad_open(struct input_dev *dev)
  90 {
  91         struct w90p910_keypad *keypad = input_get_drvdata(dev);
  92         const struct w90p910_keypad_platform_data *pdata = keypad->pdata;
  93         unsigned int val, config;
  94
  95         /* Enable unit clock */
  96         clk_enable(keypad->clk);
  97
  98         val = __raw_readl(keypad->mmio_base + KPI_CONF);
  99         val |= (KPSEL | ENKP);
 100         val &= ~(KSIZE0 | KSIZE1);
 101
 102         config = pdata->prescale | (pdata->debounce << DEBOUNCE_BIT);
 103
 104         val |= config;
 105
 106         __raw_writel(val, keypad->mmio_base + KPI_CONF);
 107
 108         return 0;
 109 }
 110
 111 static void w90p910_keypad_close(struct input_dev *dev)
 112 {
 113         struct w90p910_keypad *keypad = input_get_drvdata(dev);
 114
 115         /* Disable clock unit */
 116         clk_disable(keypad->clk);
 117 }
 118
 119 static int __devinit w90p910_keypad_probe(struct platform_device *pdev)
 120 {
 121         const struct w90p910_keypad_platform_data *pdata =
 122                                                 pdev->dev.platform_data;
 123         const struct matrix_keymap_data *keymap_data = pdata->keymap_data;
 124         struct w90p910_keypad *keypad;
 125         struct input_dev *input_dev;
 126         struct resource *res;
 127         int irq;
 128         int error;
 129
 130         if (!pdata) {
 131                 dev_err(&pdev->dev, "no platform data defined\n");
 132                 return -EINVAL;
 133         }
 134
 135         irq = platform_get_irq(pdev, 0);
 136         if (irq < 0) {
 137                 dev_err(&pdev->dev, "failed to get keypad irq\n");
 138                 return -ENXIO;
 139         }
 140
 141         keypad = kzalloc(sizeof(struct w90p910_keypad), GFP_KERNEL);
 142         input_dev = input_allocate_device();
 143         if (!keypad || !input_dev) {
 144                 dev_err(&pdev->dev, "failed to allocate driver data\n");
 145                 error = -ENOMEM;
 146                 goto failed_free;
 147         }
 148
 149         keypad->pdata = pdata;
 150         keypad->input_dev = input_dev;
 151         keypad->irq = irq;
 152
 153         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 154         if (res == NULL) {
 155                 dev_err(&pdev->dev, "failed to get I/O memory\n");
 156                 error = -ENXIO;
 157                 goto failed_free;
 158         }
 159
 160         res = request_mem_region(res->start, resource_size(res), pdev->name);
 161         if (res == NULL) {
 162                 dev_err(&pdev->dev, "failed to request I/O memory\n");
 163                 error = -EBUSY;
 164                 goto failed_free;
 165         }
 166
 167         keypad->mmio_base = ioremap(res->start, resource_size(res));
 168         if (keypad->mmio_base == NULL) {
 169                 dev_err(&pdev->dev, "failed to remap I/O memory\n");
 170                 error = -ENXIO;
 171                 goto failed_free_res;
 172         }
 173
 174         keypad->clk = clk_get(&pdev->dev, NULL);
 175         if (IS_ERR(keypad->clk)) {
 176                 dev_err(&pdev->dev, "failed to get keypad clock\n");
 177                 error = PTR_ERR(keypad->clk);
 178                 goto failed_free_io;
 179         }
 180
 181         /* set multi-function pin for w90p910 kpi. */
 182         mfp_set_groupi(&pdev->dev);
 183
 184         input_dev->name = pdev->name;
 185         input_dev->id.bustype = BUS_HOST;
 186         input_dev->open = w90p910_keypad_open;
 187         input_dev->close = w90p910_keypad_close;
 188         input_dev->dev.parent = &pdev->dev;
 189
 190         input_dev->keycode = keypad->keymap;
 191         input_dev->keycodesize = sizeof(keypad->keymap[0]);
 192         input_dev->keycodemax = ARRAY_SIZE(keypad->keymap);
 193
 194         input_set_drvdata(input_dev, keypad);
 195
 196         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
 197         input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 198
 199         matrix_keypad_build_keymap(keymap_data, W90P910_ROW_SHIFT,
 200                                    input_dev->keycode, input_dev->keybit);
 201
 202         error = request_irq(keypad->irq, w90p910_keypad_irq_handler,
 203                             IRQF_DISABLED, pdev->name, keypad);
 204         if (error) {
 205                 dev_err(&pdev->dev, "failed to request IRQ\n");
 206                 goto failed_put_clk;
 207         }
 208
 209         /* Register the input device */
 210         error = input_register_device(input_dev);
 211         if (error) {
 212                 dev_err(&pdev->dev, "failed to register input device\n");
 213                 goto failed_free_irq;
 214         }
 215
 216         platform_set_drvdata(pdev, keypad);
 217         return 0;
 218
 219 failed_free_irq:
 220         free_irq(irq, pdev);
 221 failed_put_clk:
 222         clk_put(keypad->clk);
 223 failed_free_io:
 224         iounmap(keypad->mmio_base);
 225 failed_free_res:
 226         release_mem_region(res->start, resource_size(res));
 227 failed_free:
 228         input_free_device(input_dev);
 229         kfree(keypad);
 230         return error;
 231 }
 232
 233 static int __devexit w90p910_keypad_remove(struct platform_device *pdev)
 234 {
 235         struct w90p910_keypad *keypad = platform_get_drvdata(pdev);
 236         struct resource *res;
 237
 238         free_irq(keypad->irq, pdev);
 239
 240         clk_put(keypad->clk);
 241
 242         input_unregister_device(keypad->input_dev);
 243
 244         iounmap(keypad->mmio_base);
 245         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 246         release_mem_region(res->start, resource_size(res));
 247
 248         platform_set_drvdata(pdev, NULL);
 249         kfree(keypad);
 250
 251         return 0;
 252 }
 253
 254 static struct platform_driver w90p910_keypad_driver = {
 255         .probe          = w90p910_keypad_probe,
 256         .remove         = __devexit_p(w90p910_keypad_remove),
 257         .driver         = {
 258                 .name   = "nuc900-keypad",
 259                 .owner  = THIS_MODULE,
 260         },
 261 };
 262
 263 static int __init w90p910_keypad_init(void)
 264 {
 265         return platform_driver_register(&w90p910_keypad_driver);
 266 }
 267
 268 static void __exit w90p910_keypad_exit(void)
 269 {
 270         platform_driver_unregister(&w90p910_keypad_driver);
 271 }
 272
 273 module_init(w90p910_keypad_init);
 274 module_exit(w90p910_keypad_exit);
 275
 276 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
 277 MODULE_DESCRIPTION("w90p910 keypad driver");
 278 MODULE_LICENSE("GPL");
 279 MODULE_ALIAS("platform:nuc900-keypad");