2 * Copyright (c) 2008-2009 Nuvoton technology corporation.
4 * Wan ZongShun <mcuos.com@gmail.com>
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.
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>
22 #include <linux/slab.h>
24 #include <mach/w90p910_keypad.h>
26 /* Keypad Interface Control Registers */
28 #define KPI_3KCONF 0x04
29 #define KPI_LPCONF 0x08
30 #define KPI_STATUS 0x0C
32 #define IS1KEY (0x01 << 16)
33 #define INTTR (0x01 << 21)
34 #define KEY0R (0x0f << 3)
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)
42 #define KGET_RAW(n) (((n) & KEY0R) >> 3)
43 #define KGET_COLUMN(n) ((n) & KEY0C)
45 #define W90P910_NUM_ROWS 8
46 #define W90P910_NUM_COLS 8
47 #define W90P910_ROW_SHIFT 3
49 struct w90p910_keypad {
50 const struct w90p910_keypad_platform_data *pdata;
52 struct input_dev *input_dev;
53 void __iomem *mmio_base;
55 unsigned short keymap[W90P910_NUM_ROWS * W90P910_NUM_COLS];
58 static void w90p910_keypad_scan_matrix(struct w90p910_keypad *keypad,
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];
67 input_event(input_dev, EV_MSC, MSC_SCAN, code);
68 input_report_key(input_dev, key, 1);
69 input_sync(input_dev);
71 input_event(input_dev, EV_MSC, MSC_SCAN, code);
72 input_report_key(input_dev, key, 0);
73 input_sync(input_dev);
76 static irqreturn_t w90p910_keypad_irq_handler(int irq, void *dev_id)
78 struct w90p910_keypad *keypad = dev_id;
79 unsigned int kstatus, val;
81 kstatus = __raw_readl(keypad->mmio_base + KPI_STATUS);
86 w90p910_keypad_scan_matrix(keypad, kstatus);
91 static int w90p910_keypad_open(struct input_dev *dev)
93 struct w90p910_keypad *keypad = input_get_drvdata(dev);
94 const struct w90p910_keypad_platform_data *pdata = keypad->pdata;
95 unsigned int val, config;
97 /* Enable unit clock */
98 clk_enable(keypad->clk);
100 val = __raw_readl(keypad->mmio_base + KPI_CONF);
101 val |= (KPSEL | ENKP);
102 val &= ~(KSIZE0 | KSIZE1);
104 config = pdata->prescale | (pdata->debounce << DEBOUNCE_BIT);
108 __raw_writel(val, keypad->mmio_base + KPI_CONF);
113 static void w90p910_keypad_close(struct input_dev *dev)
115 struct w90p910_keypad *keypad = input_get_drvdata(dev);
117 /* Disable clock unit */
118 clk_disable(keypad->clk);
121 static int __devinit w90p910_keypad_probe(struct platform_device *pdev)
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;
133 dev_err(&pdev->dev, "no platform data defined\n");
137 keymap_data = pdata->keymap_data;
139 irq = platform_get_irq(pdev, 0);
141 dev_err(&pdev->dev, "failed to get keypad irq\n");
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");
153 keypad->pdata = pdata;
154 keypad->input_dev = input_dev;
157 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
159 dev_err(&pdev->dev, "failed to get I/O memory\n");
164 res = request_mem_region(res->start, resource_size(res), pdev->name);
166 dev_err(&pdev->dev, "failed to request I/O memory\n");
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");
175 goto failed_free_res;
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);
185 /* set multi-function pin for w90p910 kpi. */
186 mfp_set_groupi(&pdev->dev);
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;
194 error = matrix_keypad_build_keymap(keymap_data, NULL,
195 W90P910_NUM_ROWS, W90P910_NUM_COLS,
196 keypad->keymap, input_dev);
198 dev_err(&pdev->dev, "failed to build keymap\n");
202 error = request_irq(keypad->irq, w90p910_keypad_irq_handler,
203 0, pdev->name, keypad);
205 dev_err(&pdev->dev, "failed to request IRQ\n");
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);
213 /* Register the input device */
214 error = input_register_device(input_dev);
216 dev_err(&pdev->dev, "failed to register input device\n");
217 goto failed_free_irq;
220 platform_set_drvdata(pdev, keypad);
226 clk_put(keypad->clk);
228 iounmap(keypad->mmio_base);
230 release_mem_region(res->start, resource_size(res));
232 input_free_device(input_dev);
237 static int __devexit w90p910_keypad_remove(struct platform_device *pdev)
239 struct w90p910_keypad *keypad = platform_get_drvdata(pdev);
240 struct resource *res;
242 free_irq(keypad->irq, pdev);
244 clk_put(keypad->clk);
246 input_unregister_device(keypad->input_dev);
248 iounmap(keypad->mmio_base);
249 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
250 release_mem_region(res->start, resource_size(res));
252 platform_set_drvdata(pdev, NULL);
258 static struct platform_driver w90p910_keypad_driver = {
259 .probe = w90p910_keypad_probe,
260 .remove = __devexit_p(w90p910_keypad_remove),
262 .name = "nuc900-kpi",
263 .owner = THIS_MODULE,
266 module_platform_driver(w90p910_keypad_driver);
268 MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
269 MODULE_DESCRIPTION("w90p910 keypad driver");
270 MODULE_LICENSE("GPL");
271 MODULE_ALIAS("platform:nuc900-keypad");