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 #include <linux/slab.h>
  23
  24 #include <linux/platform_data/keypad-w90p910.h>
  25
  26 /* Keypad Interface Control Registers */
  27 #define KPI_CONF                0x00
  28 #define KPI_3KCONF              0x04
  29 #define KPI_LPCONF              0x08
  30 #define KPI_STATUS              0x0C
  31
  32 #define IS1KEY                  (0x01 << 16)
  33 #define INTTR                   (0x01 << 21)
  34 #define KEY0R                   (0x0f << 3)
  35 #define KEY0C                   0x07
  36 #define DEBOUNCE_BIT            0x08
  37 #define KSIZE0                  (0x01 << 16)
  38 #define KSIZE1                  (0x01 << 17)
  39 #define KPSEL                   (0x01 << 19)
  40 #define ENKP                    (0x01 << 18)
  41
  42 #define KGET_RAW(n)             (((n) & KEY0R) >> 3)
  43 #define KGET_COLUMN(n)          ((n) & KEY0C)
  44
  45 #define W90P910_NUM_ROWS        8
  46 #define W90P910_NUM_COLS        8
  47 #define W90P910_ROW_SHIFT       3
  48
  49 struct w90p910_keypad {
  50         const struct w90p910_keypad_platform_data *pdata;
  51         struct clk *clk;
  52         struct input_dev *input_dev;
  53         void __iomem *mmio_base;
  54         int irq;
  55         unsigned short keymap[W90P910_NUM_ROWS * W90P910_NUM_COLS];
  56 };
  57
  58 static void w90p910_keypad_scan_matrix(struct w90p910_keypad *keypad,
  59                                                         unsigned int status)
  60 {
  61         struct input_dev *input_dev = keypad->input_dev;
  62         unsigned int row = KGET_RAW(status);
  63         unsigned int col = KGET_COLUMN(status);
  64         unsigned int code = MATRIX_SCAN_CODE(row, col, W90P910_ROW_SHIFT);
  65         unsigned int key = keypad->keymap[code];
  66
  67         input_event(input_dev, EV_MSC, MSC_SCAN, code);
  68         input_report_key(input_dev, key, 1);
  69         input_sync(input_dev);
  70
  71         input_event(input_dev, EV_MSC, MSC_SCAN, code);
  72         input_report_key(input_dev, key, 0);
  73         input_sync(input_dev);
  74 }
  75
  76 static irqreturn_t w90p910_keypad_irq_handler(int irq, void *dev_id)
  77 {
  78         struct w90p910_keypad *keypad = dev_id;
  79         unsigned int  kstatus, val;
  80
  81         kstatus = __raw_readl(keypad->mmio_base + KPI_STATUS);
  82
  83         val = INTTR | IS1KEY;
  84
  85         if (kstatus & val)
  86                 w90p910_keypad_scan_matrix(keypad, kstatus);
  87
  88         return IRQ_HANDLED;
  89 }
  90
  91 static int w90p910_keypad_open(struct input_dev *dev)
  92 {
  93         struct w90p910_keypad *keypad = input_get_drvdata(dev);
  94         const struct w90p910_keypad_platform_data *pdata = keypad->pdata;
  95         unsigned int val, config;
  96
  97         /* Enable unit clock */
  98         clk_enable(keypad->clk);
  99
 100         val = __raw_readl(keypad->mmio_base + KPI_CONF);
 101         val |= (KPSEL | ENKP);
 102         val &= ~(KSIZE0 | KSIZE1);
 103
 104         config = pdata->prescale | (pdata->debounce << DEBOUNCE_BIT);
 105
 106         val |= config;
 107
 108         __raw_writel(val, keypad->mmio_base + KPI_CONF);
 109
 110         return 0;
 111 }
 112
 113 static void w90p910_keypad_close(struct input_dev *dev)
 114 {
 115         struct w90p910_keypad *keypad = input_get_drvdata(dev);
 116
 117         /* Disable clock unit */
 118         clk_disable(keypad->clk);
 119 }
 120
 121 static int w90p910_keypad_probe(struct platform_device *pdev)
 122 {
 123         const struct w90p910_keypad_platform_data *pdata =
 124                                                 pdev->dev.platform_data;
 125         const struct matrix_keymap_data *keymap_data;
 126         struct w90p910_keypad *keypad;
 127         struct input_dev *input_dev;
 128         struct resource *res;
 129         int irq;
 130         int error;
 131
 132         if (!pdata) {
 133                 dev_err(&pdev->dev, "no platform data defined\n");
 134                 return -EINVAL;
 135         }
 136
 137         keymap_data = pdata->keymap_data;
 138
 139         irq = platform_get_irq(pdev, 0);
 140         if (irq < 0) {
 141                 dev_err(&pdev->dev, "failed to get keypad irq\n");
 142                 return -ENXIO;
 143         }
 144
 145         keypad = kzalloc(sizeof(struct w90p910_keypad), GFP_KERNEL);
 146         input_dev = input_allocate_device();
 147         if (!keypad || !input_dev) {
 148                 dev_err(&pdev->dev, "failed to allocate driver data\n");
 149                 error = -ENOMEM;
 150                 goto failed_free;
 151         }
 152
 153         keypad->pdata = pdata;
 154         keypad->input_dev = input_dev;
 155         keypad->irq = irq;
 156
 157         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 158         if (res == NULL) {
 159                 dev_err(&pdev->dev, "failed to get I/O memory\n");
 160                 error = -ENXIO;
 161                 goto failed_free;
 162         }
 163
 164         res = request_mem_region(res->start, resource_size(res), pdev->name);
 165         if (res == NULL) {
 166                 dev_err(&pdev->dev, "failed to request I/O memory\n");
 167                 error = -EBUSY;
 168                 goto failed_free;
 169         }
 170
 171         keypad->mmio_base = ioremap(res->start, resource_size(res));
 172         if (keypad->mmio_base == NULL) {
 173                 dev_err(&pdev->dev, "failed to remap I/O memory\n");
 174                 error = -ENXIO;
 175                 goto failed_free_res;
 176         }
 177
 178         keypad->clk = clk_get(&pdev->dev, NULL);
 179         if (IS_ERR(keypad->clk)) {
 180                 dev_err(&pdev->dev, "failed to get keypad clock\n");
 181                 error = PTR_ERR(keypad->clk);
 182                 goto failed_free_io;
 183         }
 184
 185         /* set multi-function pin for w90p910 kpi. */
 186         mfp_set_groupi(&pdev->dev);
 187
 188         input_dev->name = pdev->name;
 189         input_dev->id.bustype = BUS_HOST;
 190         input_dev->open = w90p910_keypad_open;
 191         input_dev->close = w90p910_keypad_close;
 192         input_dev->dev.parent = &pdev->dev;
 193
 194         error = matrix_keypad_build_keymap(keymap_data, NULL,
 195                                            W90P910_NUM_ROWS, W90P910_NUM_COLS,
 196                                            keypad->keymap, input_dev);
 197         if (error) {
 198                 dev_err(&pdev->dev, "failed to build keymap\n");
 199                 goto failed_put_clk;
 200         }
 201
 202         error = request_irq(keypad->irq, w90p910_keypad_irq_handler,
 203                             0, pdev->name, keypad);
 204         if (error) {
 205                 dev_err(&pdev->dev, "failed to request IRQ\n");
 206                 goto failed_put_clk;
 207         }
 208
 209         __set_bit(EV_REP, input_dev->evbit);
 210         input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 211         input_set_drvdata(input_dev, keypad);
 212
 213         /* Register the input device */
 214         error = input_register_device(input_dev);
 215         if (error) {
 216                 dev_err(&pdev->dev, "failed to register input device\n");
 217                 goto failed_free_irq;
 218         }
 219
 220         platform_set_drvdata(pdev, keypad);
 221         return 0;
 222
 223 failed_free_irq:
 224         free_irq(irq, keypad);
 225 failed_put_clk:
 226         clk_put(keypad->clk);
 227 failed_free_io:
 228         iounmap(keypad->mmio_base);
 229 failed_free_res:
 230         release_mem_region(res->start, resource_size(res));
 231 failed_free:
 232         input_free_device(input_dev);
 233         kfree(keypad);
 234         return error;
 235 }
 236
 237 static int w90p910_keypad_remove(struct platform_device *pdev)
 238 {
 239         struct w90p910_keypad *keypad = platform_get_drvdata(pdev);
 240         struct resource *res;
 241
 242         free_irq(keypad->irq, keypad);
 243
 244         clk_put(keypad->clk);
 245
 246         input_unregister_device(keypad->input_dev);
 247
 248         iounmap(keypad->mmio_base);
 249         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 250         release_mem_region(res->start, resource_size(res));
 251
 252         kfree(keypad);
 253
 254         return 0;
 255 }
 256
 257 static struct platform_driver w90p910_keypad_driver = {
 258         .probe          = w90p910_keypad_probe,
 259         .remove         = w90p910_keypad_remove,
 260         .driver         = {
 261                 .name   = "nuc900-kpi",
 262                 .owner  = THIS_MODULE,
 263         },
 264 };
 265 module_platform_driver(w90p910_keypad_driver);
 266
 267 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
 268 MODULE_DESCRIPTION("w90p910 keypad driver");
 269 MODULE_LICENSE("GPL");
 270 MODULE_ALIAS("platform:nuc900-keypad");