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/interrupt.h>
  15 #include <linux/input.h>
  16 #include <linux/device.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/clk.h>
  19 #include <linux/err.h>
  20 #include <linux/io.h>
  21 #include <linux/slab.h>
  22
  23 #include <linux/platform_data/keypad-w90p910.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_NUM_ROWS        8
  45 #define W90P910_NUM_COLS        8
  46 #define W90P910_ROW_SHIFT       3
  47
  48 struct w90p910_keypad {
  49         const struct w90p910_keypad_platform_data *pdata;
  50         struct clk *clk;
  51         struct input_dev *input_dev;
  52         void __iomem *mmio_base;
  53         int irq;
  54         unsigned short keymap[W90P910_NUM_ROWS * W90P910_NUM_COLS];
  55 };
  56
  57 static void w90p910_keypad_scan_matrix(struct w90p910_keypad *keypad,
  58                                                         unsigned int status)
  59 {
  60         struct input_dev *input_dev = keypad->input_dev;
  61         unsigned int row = KGET_RAW(status);
  62         unsigned int col = KGET_COLUMN(status);
  63         unsigned int code = MATRIX_SCAN_CODE(row, col, W90P910_ROW_SHIFT);
  64         unsigned int key = keypad->keymap[code];
  65
  66         input_event(input_dev, EV_MSC, MSC_SCAN, code);
  67         input_report_key(input_dev, key, 1);
  68         input_sync(input_dev);
  69
  70         input_event(input_dev, EV_MSC, MSC_SCAN, code);
  71         input_report_key(input_dev, key, 0);
  72         input_sync(input_dev);
  73 }
  74
  75 static irqreturn_t w90p910_keypad_irq_handler(int irq, void *dev_id)
  76 {
  77         struct w90p910_keypad *keypad = dev_id;
  78         unsigned int  kstatus, val;
  79
  80         kstatus = __raw_readl(keypad->mmio_base + KPI_STATUS);
  81
  82         val = INTTR | IS1KEY;
  83
  84         if (kstatus & val)
  85                 w90p910_keypad_scan_matrix(keypad, kstatus);
  86
  87         return IRQ_HANDLED;
  88 }
  89
  90 static int w90p910_keypad_open(struct input_dev *dev)
  91 {
  92         struct w90p910_keypad *keypad = input_get_drvdata(dev);
  93         const struct w90p910_keypad_platform_data *pdata = keypad->pdata;
  94         unsigned int val, config;
  95
  96         /* Enable unit clock */
  97         clk_enable(keypad->clk);
  98
  99         val = __raw_readl(keypad->mmio_base + KPI_CONF);
 100         val |= (KPSEL | ENKP);
 101         val &= ~(KSIZE0 | KSIZE1);
 102
 103         config = pdata->prescale | (pdata->debounce << DEBOUNCE_BIT);
 104
 105         val |= config;
 106
 107         __raw_writel(val, keypad->mmio_base + KPI_CONF);
 108
 109         return 0;
 110 }
 111
 112 static void w90p910_keypad_close(struct input_dev *dev)
 113 {
 114         struct w90p910_keypad *keypad = input_get_drvdata(dev);
 115
 116         /* Disable clock unit */
 117         clk_disable(keypad->clk);
 118 }
 119
 120 static int w90p910_keypad_probe(struct platform_device *pdev)
 121 {
 122         const struct w90p910_keypad_platform_data *pdata =
 123                                                 dev_get_platdata(&pdev->dev);
 124         const struct matrix_keymap_data *keymap_data;
 125         struct w90p910_keypad *keypad;
 126         struct input_dev *input_dev;
 127         struct resource *res;
 128         int irq;
 129         int error;
 130
 131         if (!pdata) {
 132                 dev_err(&pdev->dev, "no platform data defined\n");
 133                 return -EINVAL;
 134         }
 135
 136         keymap_data = pdata->keymap_data;
 137
 138         irq = platform_get_irq(pdev, 0);
 139         if (irq < 0) {
 140                 dev_err(&pdev->dev, "failed to get keypad irq\n");
 141                 return -ENXIO;
 142         }
 143
 144         keypad = kzalloc(sizeof(struct w90p910_keypad), GFP_KERNEL);
 145         input_dev = input_allocate_device();
 146         if (!keypad || !input_dev) {
 147                 dev_err(&pdev->dev, "failed to allocate driver data\n");
 148                 error = -ENOMEM;
 149                 goto failed_free;
 150         }
 151
 152         keypad->pdata = pdata;
 153         keypad->input_dev = input_dev;
 154         keypad->irq = irq;
 155
 156         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 157         if (res == NULL) {
 158                 dev_err(&pdev->dev, "failed to get I/O memory\n");
 159                 error = -ENXIO;
 160                 goto failed_free;
 161         }
 162
 163         res = request_mem_region(res->start, resource_size(res), pdev->name);
 164         if (res == NULL) {
 165                 dev_err(&pdev->dev, "failed to request I/O memory\n");
 166                 error = -EBUSY;
 167                 goto failed_free;
 168         }
 169
 170         keypad->mmio_base = ioremap(res->start, resource_size(res));
 171         if (keypad->mmio_base == NULL) {
 172                 dev_err(&pdev->dev, "failed to remap I/O memory\n");
 173                 error = -ENXIO;
 174                 goto failed_free_res;
 175         }
 176
 177         keypad->clk = clk_get(&pdev->dev, NULL);
 178         if (IS_ERR(keypad->clk)) {
 179                 dev_err(&pdev->dev, "failed to get keypad clock\n");
 180                 error = PTR_ERR(keypad->clk);
 181                 goto failed_free_io;
 182         }
 183
 184         /* set multi-function pin for w90p910 kpi. */
 185         mfp_set_groupi(&pdev->dev);
 186
 187         input_dev->name = pdev->name;
 188         input_dev->id.bustype = BUS_HOST;
 189         input_dev->open = w90p910_keypad_open;
 190         input_dev->close = w90p910_keypad_close;
 191         input_dev->dev.parent = &pdev->dev;
 192
 193         error = matrix_keypad_build_keymap(keymap_data, NULL,
 194                                            W90P910_NUM_ROWS, W90P910_NUM_COLS,
 195                                            keypad->keymap, input_dev);
 196         if (error) {
 197                 dev_err(&pdev->dev, "failed to build keymap\n");
 198                 goto failed_put_clk;
 199         }
 200
 201         error = request_irq(keypad->irq, w90p910_keypad_irq_handler,
 202                             0, pdev->name, keypad);
 203         if (error) {
 204                 dev_err(&pdev->dev, "failed to request IRQ\n");
 205                 goto failed_put_clk;
 206         }
 207
 208         __set_bit(EV_REP, input_dev->evbit);
 209         input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 210         input_set_drvdata(input_dev, keypad);
 211
 212         /* Register the input device */
 213         error = input_register_device(input_dev);
 214         if (error) {
 215                 dev_err(&pdev->dev, "failed to register input device\n");
 216                 goto failed_free_irq;
 217         }
 218
 219         platform_set_drvdata(pdev, keypad);
 220         return 0;
 221
 222 failed_free_irq:
 223         free_irq(irq, keypad);
 224 failed_put_clk:
 225         clk_put(keypad->clk);
 226 failed_free_io:
 227         iounmap(keypad->mmio_base);
 228 failed_free_res:
 229         release_mem_region(res->start, resource_size(res));
 230 failed_free:
 231         input_free_device(input_dev);
 232         kfree(keypad);
 233         return error;
 234 }
 235
 236 static int w90p910_keypad_remove(struct platform_device *pdev)
 237 {
 238         struct w90p910_keypad *keypad = platform_get_drvdata(pdev);
 239         struct resource *res;
 240
 241         free_irq(keypad->irq, keypad);
 242
 243         clk_put(keypad->clk);
 244
 245         input_unregister_device(keypad->input_dev);
 246
 247         iounmap(keypad->mmio_base);
 248         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 249         release_mem_region(res->start, resource_size(res));
 250
 251         kfree(keypad);
 252
 253         return 0;
 254 }
 255
 256 static struct platform_driver w90p910_keypad_driver = {
 257         .probe          = w90p910_keypad_probe,
 258         .remove         = w90p910_keypad_remove,
 259         .driver         = {
 260                 .name   = "nuc900-kpi",
 261         },
 262 };
 263 module_platform_driver(w90p910_keypad_driver);
 264
 265 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
 266 MODULE_DESCRIPTION("w90p910 keypad driver");
 267 MODULE_LICENSE("GPL");
 268 MODULE_ALIAS("platform:nuc900-keypad");