drivers/input/keyboard/w90p910_keypad.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2008-2009 Nuvoton technology corporation.
   4  *
   5  * Wan ZongShun <mcuos.com@gmail.com>
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/input.h>
  12 #include <linux/device.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/clk.h>
  15 #include <linux/err.h>
  16 #include <linux/io.h>
  17 #include <linux/slab.h>
  18
  19 #include <linux/platform_data/keypad-w90p910.h>
  20
  21 /* Keypad Interface Control Registers */
  22 #define KPI_CONF                0x00
  23 #define KPI_3KCONF              0x04
  24 #define KPI_LPCONF              0x08
  25 #define KPI_STATUS              0x0C
  26
  27 #define IS1KEY                  (0x01 << 16)
  28 #define INTTR                   (0x01 << 21)
  29 #define KEY0R                   (0x0f << 3)
  30 #define KEY0C                   0x07
  31 #define DEBOUNCE_BIT            0x08
  32 #define KSIZE0                  (0x01 << 16)
  33 #define KSIZE1                  (0x01 << 17)
  34 #define KPSEL                   (0x01 << 19)
  35 #define ENKP                    (0x01 << 18)
  36
  37 #define KGET_RAW(n)             (((n) & KEY0R) >> 3)
  38 #define KGET_COLUMN(n)          ((n) & KEY0C)
  39
  40 #define W90P910_NUM_ROWS        8
  41 #define W90P910_NUM_COLS        8
  42 #define W90P910_ROW_SHIFT       3
  43
  44 struct w90p910_keypad {
  45         const struct w90p910_keypad_platform_data *pdata;
  46         struct clk *clk;
  47         struct input_dev *input_dev;
  48         void __iomem *mmio_base;
  49         int irq;
  50         unsigned short keymap[W90P910_NUM_ROWS * W90P910_NUM_COLS];
  51 };
  52
  53 static void w90p910_keypad_scan_matrix(struct w90p910_keypad *keypad,
  54                                                         unsigned int status)
  55 {
  56         struct input_dev *input_dev = keypad->input_dev;
  57         unsigned int row = KGET_RAW(status);
  58         unsigned int col = KGET_COLUMN(status);
  59         unsigned int code = MATRIX_SCAN_CODE(row, col, W90P910_ROW_SHIFT);
  60         unsigned int key = keypad->keymap[code];
  61
  62         input_event(input_dev, EV_MSC, MSC_SCAN, code);
  63         input_report_key(input_dev, key, 1);
  64         input_sync(input_dev);
  65
  66         input_event(input_dev, EV_MSC, MSC_SCAN, code);
  67         input_report_key(input_dev, key, 0);
  68         input_sync(input_dev);
  69 }
  70
  71 static irqreturn_t w90p910_keypad_irq_handler(int irq, void *dev_id)
  72 {
  73         struct w90p910_keypad *keypad = dev_id;
  74         unsigned int  kstatus, val;
  75
  76         kstatus = __raw_readl(keypad->mmio_base + KPI_STATUS);
  77
  78         val = INTTR | IS1KEY;
  79
  80         if (kstatus & val)
  81                 w90p910_keypad_scan_matrix(keypad, kstatus);
  82
  83         return IRQ_HANDLED;
  84 }
  85
  86 static int w90p910_keypad_open(struct input_dev *dev)
  87 {
  88         struct w90p910_keypad *keypad = input_get_drvdata(dev);
  89         const struct w90p910_keypad_platform_data *pdata = keypad->pdata;
  90         unsigned int val, config;
  91
  92         /* Enable unit clock */
  93         clk_enable(keypad->clk);
  94
  95         val = __raw_readl(keypad->mmio_base + KPI_CONF);
  96         val |= (KPSEL | ENKP);
  97         val &= ~(KSIZE0 | KSIZE1);
  98
  99         config = pdata->prescale | (pdata->debounce << DEBOUNCE_BIT);
 100
 101         val |= config;
 102
 103         __raw_writel(val, keypad->mmio_base + KPI_CONF);
 104
 105         return 0;
 106 }
 107
 108 static void w90p910_keypad_close(struct input_dev *dev)
 109 {
 110         struct w90p910_keypad *keypad = input_get_drvdata(dev);
 111
 112         /* Disable clock unit */
 113         clk_disable(keypad->clk);
 114 }
 115
 116 static int w90p910_keypad_probe(struct platform_device *pdev)
 117 {
 118         const struct w90p910_keypad_platform_data *pdata =
 119                                                 dev_get_platdata(&pdev->dev);
 120         const struct matrix_keymap_data *keymap_data;
 121         struct w90p910_keypad *keypad;
 122         struct input_dev *input_dev;
 123         struct resource *res;
 124         int irq;
 125         int error;
 126
 127         if (!pdata) {
 128                 dev_err(&pdev->dev, "no platform data defined\n");
 129                 return -EINVAL;
 130         }
 131
 132         keymap_data = pdata->keymap_data;
 133
 134         irq = platform_get_irq(pdev, 0);
 135         if (irq < 0) {
 136                 dev_err(&pdev->dev, "failed to get keypad irq\n");
 137                 return -ENXIO;
 138         }
 139
 140         keypad = kzalloc(sizeof(struct w90p910_keypad), GFP_KERNEL);
 141         input_dev = input_allocate_device();
 142         if (!keypad || !input_dev) {
 143                 dev_err(&pdev->dev, "failed to allocate driver data\n");
 144                 error = -ENOMEM;
 145                 goto failed_free;
 146         }
 147
 148         keypad->pdata = pdata;
 149         keypad->input_dev = input_dev;
 150         keypad->irq = irq;
 151
 152         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 153         if (res == NULL) {
 154                 dev_err(&pdev->dev, "failed to get I/O memory\n");
 155                 error = -ENXIO;
 156                 goto failed_free;
 157         }
 158
 159         res = request_mem_region(res->start, resource_size(res), pdev->name);
 160         if (res == NULL) {
 161                 dev_err(&pdev->dev, "failed to request I/O memory\n");
 162                 error = -EBUSY;
 163                 goto failed_free;
 164         }
 165
 166         keypad->mmio_base = ioremap(res->start, resource_size(res));
 167         if (keypad->mmio_base == NULL) {
 168                 dev_err(&pdev->dev, "failed to remap I/O memory\n");
 169                 error = -ENXIO;
 170                 goto failed_free_res;
 171         }
 172
 173         keypad->clk = clk_get(&pdev->dev, NULL);
 174         if (IS_ERR(keypad->clk)) {
 175                 dev_err(&pdev->dev, "failed to get keypad clock\n");
 176                 error = PTR_ERR(keypad->clk);
 177                 goto failed_free_io;
 178         }
 179
 180         /* set multi-function pin for w90p910 kpi. */
 181         mfp_set_groupi(&pdev->dev);
 182
 183         input_dev->name = pdev->name;
 184         input_dev->id.bustype = BUS_HOST;
 185         input_dev->open = w90p910_keypad_open;
 186         input_dev->close = w90p910_keypad_close;
 187         input_dev->dev.parent = &pdev->dev;
 188
 189         error = matrix_keypad_build_keymap(keymap_data, NULL,
 190                                            W90P910_NUM_ROWS, W90P910_NUM_COLS,
 191                                            keypad->keymap, input_dev);
 192         if (error) {
 193                 dev_err(&pdev->dev, "failed to build keymap\n");
 194                 goto failed_put_clk;
 195         }
 196
 197         error = request_irq(keypad->irq, w90p910_keypad_irq_handler,
 198                             0, pdev->name, keypad);
 199         if (error) {
 200                 dev_err(&pdev->dev, "failed to request IRQ\n");
 201                 goto failed_put_clk;
 202         }
 203
 204         __set_bit(EV_REP, input_dev->evbit);
 205         input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 206         input_set_drvdata(input_dev, keypad);
 207
 208         /* Register the input device */
 209         error = input_register_device(input_dev);
 210         if (error) {
 211                 dev_err(&pdev->dev, "failed to register input device\n");
 212                 goto failed_free_irq;
 213         }
 214
 215         platform_set_drvdata(pdev, keypad);
 216         return 0;
 217
 218 failed_free_irq:
 219         free_irq(irq, keypad);
 220 failed_put_clk:
 221         clk_put(keypad->clk);
 222 failed_free_io:
 223         iounmap(keypad->mmio_base);
 224 failed_free_res:
 225         release_mem_region(res->start, resource_size(res));
 226 failed_free:
 227         input_free_device(input_dev);
 228         kfree(keypad);
 229         return error;
 230 }
 231
 232 static int w90p910_keypad_remove(struct platform_device *pdev)
 233 {
 234         struct w90p910_keypad *keypad = platform_get_drvdata(pdev);
 235         struct resource *res;
 236
 237         free_irq(keypad->irq, keypad);
 238
 239         clk_put(keypad->clk);
 240
 241         input_unregister_device(keypad->input_dev);
 242
 243         iounmap(keypad->mmio_base);
 244         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 245         release_mem_region(res->start, resource_size(res));
 246
 247         kfree(keypad);
 248
 249         return 0;
 250 }
 251
 252 static struct platform_driver w90p910_keypad_driver = {
 253         .probe          = w90p910_keypad_probe,
 254         .remove         = w90p910_keypad_remove,
 255         .driver         = {
 256                 .name   = "nuc900-kpi",
 257         },
 258 };
 259 module_platform_driver(w90p910_keypad_driver);
 260
 261 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
 262 MODULE_DESCRIPTION("w90p910 keypad driver");
 263 MODULE_LICENSE("GPL");
 264 MODULE_ALIAS("platform:nuc900-keypad");