2 * Driver for the Cirrus EP93xx matrix keypad controller.
4 * Copyright (c) 2008 H Hartley Sweeten <hsweeten@visionengravers.com>
6 * Based on the pxa27x matrix keypad controller by Rodolfo Giometti.
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.
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.
18 * Normal operation for the matrix does not autorepeat the key press.
19 * This action can be enabled by setting the EP93XX_KEYPAD_AUTOREPEAT
23 #include <linux/module.h>
24 #include <linux/platform_device.h>
25 #include <linux/interrupt.h>
26 #include <linux/clk.h>
28 #include <linux/input/matrix_keypad.h>
29 #include <linux/slab.h>
31 #include <mach/hardware.h>
32 #include <linux/platform_data/keypad-ep93xx.h>
35 * Keypad Interface Register offsets
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 */
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)
51 /* Key Scan Diagnostic Register bit defines */
52 #define KEY_DIAG_MASK (0x0000003f)
53 #define KEY_DIAG_SHIFT (0)
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)
65 #define EP93XX_MATRIX_SIZE (EP93XX_MATRIX_ROWS * EP93XX_MATRIX_COLS)
67 struct ep93xx_keypad {
68 struct ep93xx_keypad_platform_data *pdata;
69 struct input_dev *input_dev;
72 void __iomem *mmio_base;
74 unsigned short keycodes[EP93XX_MATRIX_SIZE];
84 static irqreturn_t ep93xx_keypad_irq_handler(int irq, void *dev_id)
86 struct ep93xx_keypad *keypad = dev_id;
87 struct input_dev *input_dev = keypad->input_dev;
89 int keycode, key1, key2;
91 status = __raw_readl(keypad->mmio_base + KEY_REG);
93 keycode = (status & KEY_REG_KEY1_MASK) >> KEY_REG_KEY1_SHIFT;
94 key1 = keypad->keycodes[keycode];
96 keycode = (status & KEY_REG_KEY2_MASK) >> KEY_REG_KEY2_SHIFT;
97 key2 = keypad->keycodes[keycode];
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);
103 if (keypad->key2 && key1 != keypad->key2 && key2 != keypad->key2)
104 input_report_key(input_dev, keypad->key2, 0);
106 input_report_key(input_dev, key1, 1);
107 input_report_key(input_dev, key2, 1);
112 } else if (status & KEY_REG_1KEY) {
113 if (keypad->key1 && key1 != keypad->key1)
114 input_report_key(input_dev, keypad->key1, 0);
116 if (keypad->key2 && key1 != keypad->key2)
117 input_report_key(input_dev, keypad->key2, 0);
119 input_report_key(input_dev, key1, 1);
125 input_report_key(input_dev, keypad->key1, 0);
126 input_report_key(input_dev, keypad->key2, 0);
128 keypad->key1 = keypad->key2 = 0;
130 input_sync(input_dev);
135 static void ep93xx_keypad_config(struct ep93xx_keypad *keypad)
137 struct ep93xx_keypad_platform_data *pdata = keypad->pdata;
138 unsigned int val = 0;
140 if (pdata->flags & EP93XX_KEYPAD_KDIV)
141 clk_set_rate(keypad->clk, EP93XX_KEYTCHCLK_DIV4);
143 clk_set_rate(keypad->clk, EP93XX_KEYTCHCLK_DIV16);
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)
154 val |= ((pdata->debounce << KEY_INIT_DBNC_SHIFT) & KEY_INIT_DBNC_MASK);
156 val |= ((pdata->prescale << KEY_INIT_PRSCL_SHIFT) & KEY_INIT_PRSCL_MASK);
158 __raw_writel(val, keypad->mmio_base + KEY_INIT);
161 static int ep93xx_keypad_open(struct input_dev *pdev)
163 struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
165 if (!keypad->enabled) {
166 ep93xx_keypad_config(keypad);
167 clk_enable(keypad->clk);
168 keypad->enabled = true;
174 static void ep93xx_keypad_close(struct input_dev *pdev)
176 struct ep93xx_keypad *keypad = input_get_drvdata(pdev);
178 if (keypad->enabled) {
179 clk_disable(keypad->clk);
180 keypad->enabled = false;
185 #ifdef CONFIG_PM_SLEEP
186 static int ep93xx_keypad_suspend(struct device *dev)
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;
192 mutex_lock(&input_dev->mutex);
194 if (keypad->enabled) {
195 clk_disable(keypad->clk);
196 keypad->enabled = false;
199 mutex_unlock(&input_dev->mutex);
201 if (device_may_wakeup(&pdev->dev))
202 enable_irq_wake(keypad->irq);
207 static int ep93xx_keypad_resume(struct device *dev)
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;
213 if (device_may_wakeup(&pdev->dev))
214 disable_irq_wake(keypad->irq);
216 mutex_lock(&input_dev->mutex);
218 if (input_dev->users) {
219 if (!keypad->enabled) {
220 ep93xx_keypad_config(keypad);
221 clk_enable(keypad->clk);
222 keypad->enabled = true;
226 mutex_unlock(&input_dev->mutex);
232 static SIMPLE_DEV_PM_OPS(ep93xx_keypad_pm_ops,
233 ep93xx_keypad_suspend, ep93xx_keypad_resume);
235 static int ep93xx_keypad_probe(struct platform_device *pdev)
237 struct ep93xx_keypad *keypad;
238 const struct matrix_keymap_data *keymap_data;
239 struct input_dev *input_dev;
240 struct resource *res;
243 keypad = kzalloc(sizeof(struct ep93xx_keypad), GFP_KERNEL);
247 keypad->pdata = dev_get_platdata(&pdev->dev);
248 if (!keypad->pdata) {
253 keymap_data = keypad->pdata->keymap_data;
259 keypad->irq = platform_get_irq(pdev, 0);
265 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
271 res = request_mem_region(res->start, resource_size(res), pdev->name);
277 keypad->mmio_base = ioremap(res->start, resource_size(res));
278 if (keypad->mmio_base == NULL) {
280 goto failed_free_mem;
283 err = ep93xx_keypad_acquire_gpio(pdev);
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;
293 input_dev = input_allocate_device();
299 keypad->input_dev = input_dev;
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;
307 err = matrix_keypad_build_keymap(keymap_data, NULL,
308 EP93XX_MATRIX_ROWS, EP93XX_MATRIX_COLS,
309 keypad->keycodes, input_dev);
311 goto failed_free_dev;
313 if (keypad->pdata->flags & EP93XX_KEYPAD_AUTOREPEAT)
314 __set_bit(EV_REP, input_dev->evbit);
315 input_set_drvdata(input_dev, keypad);
317 err = request_irq(keypad->irq, ep93xx_keypad_irq_handler,
318 0, pdev->name, keypad);
320 goto failed_free_dev;
322 err = input_register_device(input_dev);
324 goto failed_free_irq;
326 platform_set_drvdata(pdev, keypad);
327 device_init_wakeup(&pdev->dev, 1);
332 free_irq(keypad->irq, keypad);
334 input_free_device(input_dev);
336 clk_put(keypad->clk);
338 ep93xx_keypad_release_gpio(pdev);
340 iounmap(keypad->mmio_base);
342 release_mem_region(res->start, resource_size(res));
348 static int ep93xx_keypad_remove(struct platform_device *pdev)
350 struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
351 struct resource *res;
353 free_irq(keypad->irq, keypad);
356 clk_disable(keypad->clk);
357 clk_put(keypad->clk);
359 input_unregister_device(keypad->input_dev);
361 ep93xx_keypad_release_gpio(pdev);
363 iounmap(keypad->mmio_base);
365 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
366 release_mem_region(res->start, resource_size(res));
373 static struct platform_driver ep93xx_keypad_driver = {
375 .name = "ep93xx-keypad",
376 .pm = &ep93xx_keypad_pm_ops,
378 .probe = ep93xx_keypad_probe,
379 .remove = ep93xx_keypad_remove,
381 module_platform_driver(ep93xx_keypad_driver);
383 MODULE_LICENSE("GPL");
384 MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
385 MODULE_DESCRIPTION("EP93xx Matrix Keypad Controller");
386 MODULE_ALIAS("platform:ep93xx-keypad");