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1/*
2 * Driver for the Cirrus EP93xx matrix keypad controller.
3 *
4 * Copyright (c) 2008 H Hartley Sweeten <hsweeten@visionengravers.com>
5 *
6 * Based on the pxa27x matrix keypad controller by Rodolfo Giometti.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * NOTE:
13 *
14 * The 3-key reset is triggered by pressing the 3 keys in
15 * Row 0, Columns 2, 4, and 7 at the same time. This action can
16 * be disabled by setting the EP93XX_KEYPAD_DISABLE_3_KEY flag.
17 *
18 * Normal operation for the matrix does not autorepeat the key press.
19 * This action can be enabled by setting the EP93XX_KEYPAD_AUTOREPEAT
20 * flag.
21 */
22
23#include <linux/module.h>
24#include <linux/platform_device.h>
25#include <linux/interrupt.h>
26#include <linux/clk.h>
27#include <linux/io.h>
28#include <linux/input/matrix_keypad.h>
29#include <linux/slab.h>
30
31#include <mach/hardware.h>
32#include <linux/platform_data/keypad-ep93xx.h>
33
34/*
35 * Keypad Interface Register offsets
36 */
37#define KEY_INIT 0x00 /* Key Scan Initialization register */
38#define KEY_DIAG 0x04 /* Key Scan Diagnostic register */
39#define KEY_REG 0x08 /* Key Value Capture register */
40
41/* Key Scan Initialization Register bit defines */
42#define KEY_INIT_DBNC_MASK (0x00ff0000)
43#define KEY_INIT_DBNC_SHIFT (16)
44#define KEY_INIT_DIS3KY (1<<15)
45#define KEY_INIT_DIAG (1<<14)
46#define KEY_INIT_BACK (1<<13)
47#define KEY_INIT_T2 (1<<12)
48#define KEY_INIT_PRSCL_MASK (0x000003ff)
49#define KEY_INIT_PRSCL_SHIFT (0)
50
51/* Key Scan Diagnostic Register bit defines */
52#define KEY_DIAG_MASK (0x0000003f)
53#define KEY_DIAG_SHIFT (0)
54
55/* Key Value Capture Register bit defines */
56#define KEY_REG_K (1<<15)
57#define KEY_REG_INT (1<<14)
58#define KEY_REG_2KEYS (1<<13)
59#define KEY_REG_1KEY (1<<12)
60#define KEY_REG_KEY2_MASK (0x00000fc0)
61#define KEY_REG_KEY2_SHIFT (6)
62#define KEY_REG_KEY1_MASK (0x0000003f)
63#define KEY_REG_KEY1_SHIFT (0)
64
65#define EP93XX_MATRIX_SIZE (EP93XX_MATRIX_ROWS * EP93XX_MATRIX_COLS)
66
67struct ep93xx_keypad {
68 struct ep93xx_keypad_platform_data *pdata;
69 struct input_dev *input_dev;
70 struct clk *clk;
71
72 void __iomem *mmio_base;
73
74 unsigned short keycodes[EP93XX_MATRIX_SIZE];
75
76 int key1;
77 int key2;
78
79 int irq;
80
81 bool enabled;
82};
83
84static irqreturn_t ep93xx_keypad_irq_handler(int irq, void *dev_id)
85{
86 struct ep93xx_keypad *keypad = dev_id;
87 struct input_dev *input_dev = keypad->input_dev;
88 unsigned int status;
89 int keycode, key1, key2;
90
91 status = __raw_readl(keypad->mmio_base + KEY_REG);
92
93 keycode = (status & KEY_REG_KEY1_MASK) >> KEY_REG_KEY1_SHIFT;
94 key1 = keypad->keycodes[keycode];
95
96 keycode = (status & KEY_REG_KEY2_MASK) >> KEY_REG_KEY2_SHIFT;
97 key2 = keypad->keycodes[keycode];
98
99 if (status & KEY_REG_2KEYS) {
100 if (keypad->key1 && key1 != keypad->key1 && key2 != keypad->key1)
101 input_report_key(input_dev, keypad->key1, 0);
102
103 if (keypad->key2 && key1 != keypad->key2 && key2 != keypad->key2)
104 input_report_key(input_dev, keypad->key2, 0);
105
106 input_report_key(input_dev, key1, 1);
107 input_report_key(input_dev, key2, 1);
108
109 keypad->key1 = key1;
110 keypad->key2 = key2;
111
112 } else if (status & KEY_REG_1KEY) {
113 if (keypad->key1 && key1 != keypad->key1)
114 input_report_key(input_dev, keypad->key1, 0);
115
116 if (keypad->key2 && key1 != keypad->key2)
117 input_report_key(input_dev, keypad->key2, 0);
118
119 input_report_key(input_dev, key1, 1);
120
121 keypad->key1 = key1;
122 keypad->key2 = 0;
123
124 } else {
125 input_report_key(input_dev, keypad->key1, 0);
126 input_report_key(input_dev, keypad->key2, 0);
127
128 keypad->key1 = keypad->key2 = 0;
129 }
130 input_sync(input_dev);
131
132 return IRQ_HANDLED;
133}
134
135static void ep93xx_keypad_config(struct ep93xx_keypad *keypad)
136{
137 struct ep93xx_keypad_platform_data *pdata = keypad->pdata;
138 unsigned int val = 0;
139
140 if (pdata->flags & EP93XX_KEYPAD_KDIV)
141 clk_set_rate(keypad->clk, EP93XX_KEYTCHCLK_DIV4);
142 else
143 clk_set_rate(keypad->clk, EP93XX_KEYTCHCLK_DIV16);
144
145 if (pdata->flags & EP93XX_KEYPAD_DISABLE_3_KEY)
146 val |= KEY_INIT_DIS3KY;
147 if (pdata->flags & EP93XX_KEYPAD_DIAG_MODE)
148 val |= KEY_INIT_DIAG;
149 if (pdata->flags & EP93XX_KEYPAD_BACK_DRIVE)
150 val |= KEY_INIT_BACK;
151 if (pdata->flags & EP93XX_KEYPAD_TEST_MODE)
152 val |= KEY_INIT_T2;
153
154 val |= ((pdata->debounce << KEY_INIT_DBNC_SHIFT) & KEY_INIT_DBNC_MASK);
155
156 val |= ((pdata->prescale << KEY_INIT_PRSCL_SHIFT) & KEY_INIT_PRSCL_MASK);
157
158 __raw_writel(val, keypad->mmio_base + KEY_INIT);
159}
160
161static int ep93xx_keypad_open(struct input_dev *pdev)
162{
163 struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
164
165 if (!keypad->enabled) {
166 ep93xx_keypad_config(keypad);
167 clk_enable(keypad->clk);
168 keypad->enabled = true;
169 }
170
171 return 0;
172}
173
174static void ep93xx_keypad_close(struct input_dev *pdev)
175{
176 struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
177
178 if (keypad->enabled) {
179 clk_disable(keypad->clk);
180 keypad->enabled = false;
181 }
182}
183
184
185#ifdef CONFIG_PM_SLEEP
186static int ep93xx_keypad_suspend(struct device *dev)
187{
188 struct platform_device *pdev = to_platform_device(dev);
189 struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
190 struct input_dev *input_dev = keypad->input_dev;
191
192 mutex_lock(&input_dev->mutex);
193
194 if (keypad->enabled) {
195 clk_disable(keypad->clk);
196 keypad->enabled = false;
197 }
198
199 mutex_unlock(&input_dev->mutex);
200
201 if (device_may_wakeup(&pdev->dev))
202 enable_irq_wake(keypad->irq);
203
204 return 0;
205}
206
207static int ep93xx_keypad_resume(struct device *dev)
208{
209 struct platform_device *pdev = to_platform_device(dev);
210 struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
211 struct input_dev *input_dev = keypad->input_dev;
212
213 if (device_may_wakeup(&pdev->dev))
214 disable_irq_wake(keypad->irq);
215
216 mutex_lock(&input_dev->mutex);
217
218 if (input_dev->users) {
219 if (!keypad->enabled) {
220 ep93xx_keypad_config(keypad);
221 clk_enable(keypad->clk);
222 keypad->enabled = true;
223 }
224 }
225
226 mutex_unlock(&input_dev->mutex);
227
228 return 0;
229}
230#endif
231
232static SIMPLE_DEV_PM_OPS(ep93xx_keypad_pm_ops,
233 ep93xx_keypad_suspend, ep93xx_keypad_resume);
234
235static int ep93xx_keypad_probe(struct platform_device *pdev)
236{
237 struct ep93xx_keypad *keypad;
238 const struct matrix_keymap_data *keymap_data;
239 struct input_dev *input_dev;
240 struct resource *res;
241 int err;
242
243 keypad = kzalloc(sizeof(struct ep93xx_keypad), GFP_KERNEL);
244 if (!keypad)
245 return -ENOMEM;
246
247 keypad->pdata = dev_get_platdata(&pdev->dev);
248 if (!keypad->pdata) {
249 err = -EINVAL;
250 goto failed_free;
251 }
252
253 keymap_data = keypad->pdata->keymap_data;
254 if (!keymap_data) {
255 err = -EINVAL;
256 goto failed_free;
257 }
258
259 keypad->irq = platform_get_irq(pdev, 0);
260 if (!keypad->irq) {
261 err = -ENXIO;
262 goto failed_free;
263 }
264
265 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
266 if (!res) {
267 err = -ENXIO;
268 goto failed_free;
269 }
270
271 res = request_mem_region(res->start, resource_size(res), pdev->name);
272 if (!res) {
273 err = -EBUSY;
274 goto failed_free;
275 }
276
277 keypad->mmio_base = ioremap(res->start, resource_size(res));
278 if (keypad->mmio_base == NULL) {
279 err = -ENXIO;
280 goto failed_free_mem;
281 }
282
283 err = ep93xx_keypad_acquire_gpio(pdev);
284 if (err)
285 goto failed_free_io;
286
287 keypad->clk = clk_get(&pdev->dev, NULL);
288 if (IS_ERR(keypad->clk)) {
289 err = PTR_ERR(keypad->clk);
290 goto failed_free_gpio;
291 }
292
293 input_dev = input_allocate_device();
294 if (!input_dev) {
295 err = -ENOMEM;
296 goto failed_put_clk;
297 }
298
299 keypad->input_dev = input_dev;
300
301 input_dev->name = pdev->name;
302 input_dev->id.bustype = BUS_HOST;
303 input_dev->open = ep93xx_keypad_open;
304 input_dev->close = ep93xx_keypad_close;
305 input_dev->dev.parent = &pdev->dev;
306
307 err = matrix_keypad_build_keymap(keymap_data, NULL,
308 EP93XX_MATRIX_ROWS, EP93XX_MATRIX_COLS,
309 keypad->keycodes, input_dev);
310 if (err)
311 goto failed_free_dev;
312
313 if (keypad->pdata->flags & EP93XX_KEYPAD_AUTOREPEAT)
314 __set_bit(EV_REP, input_dev->evbit);
315 input_set_drvdata(input_dev, keypad);
316
317 err = request_irq(keypad->irq, ep93xx_keypad_irq_handler,
318 0, pdev->name, keypad);
319 if (err)
320 goto failed_free_dev;
321
322 err = input_register_device(input_dev);
323 if (err)
324 goto failed_free_irq;
325
326 platform_set_drvdata(pdev, keypad);
327 device_init_wakeup(&pdev->dev, 1);
328
329 return 0;
330
331failed_free_irq:
332 free_irq(keypad->irq, keypad);
333failed_free_dev:
334 input_free_device(input_dev);
335failed_put_clk:
336 clk_put(keypad->clk);
337failed_free_gpio:
338 ep93xx_keypad_release_gpio(pdev);
339failed_free_io:
340 iounmap(keypad->mmio_base);
341failed_free_mem:
342 release_mem_region(res->start, resource_size(res));
343failed_free:
344 kfree(keypad);
345 return err;
346}
347
348static int ep93xx_keypad_remove(struct platform_device *pdev)
349{
350 struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
351 struct resource *res;
352
353 free_irq(keypad->irq, keypad);
354
355 if (keypad->enabled)
356 clk_disable(keypad->clk);
357 clk_put(keypad->clk);
358
359 input_unregister_device(keypad->input_dev);
360
361 ep93xx_keypad_release_gpio(pdev);
362
363 iounmap(keypad->mmio_base);
364
365 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
366 release_mem_region(res->start, resource_size(res));
367
368 kfree(keypad);
369
370 return 0;
371}
372
373static struct platform_driver ep93xx_keypad_driver = {
374 .driver = {
375 .name = "ep93xx-keypad",
376 .pm = &ep93xx_keypad_pm_ops,
377 },
378 .probe = ep93xx_keypad_probe,
379 .remove = ep93xx_keypad_remove,
380};
381module_platform_driver(ep93xx_keypad_driver);
382
383MODULE_LICENSE("GPL");
384MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
385MODULE_DESCRIPTION("EP93xx Matrix Keypad Controller");
386MODULE_ALIAS("platform:ep93xx-keypad");
387

Warning: That file was not part of the compilation database. It may have many parsing errors.