summaryrefslogtreecommitdiffstats
path: root/drivers/input/keyboard/ep93xx_keypad.c
blob: f5bf7524722a7867d0e8bac07b582188c68d77f1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Driver for the Cirrus EP93xx matrix keypad controller.
 *
 * Copyright (c) 2008 H Hartley Sweeten <hsweeten@visionengravers.com>
 *
 * Based on the pxa27x matrix keypad controller by Rodolfo Giometti.
 *
 * NOTE:
 *
 * The 3-key reset is triggered by pressing the 3 keys in
 * Row 0, Columns 2, 4, and 7 at the same time.  This action can
 * be disabled by setting the EP93XX_KEYPAD_DISABLE_3_KEY flag.
 *
 * Normal operation for the matrix does not autorepeat the key press.
 * This action can be enabled by setting the EP93XX_KEYPAD_AUTOREPEAT
 * flag.
 */

#include <linux/bits.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/input.h>
#include <linux/input/matrix_keypad.h>
#include <linux/slab.h>
#include <linux/soc/cirrus/ep93xx.h>
#include <linux/platform_data/keypad-ep93xx.h>
#include <linux/pm_wakeirq.h>

/*
 * Keypad Interface Register offsets
 */
#define KEY_INIT		0x00	/* Key Scan Initialization register */
#define KEY_DIAG		0x04	/* Key Scan Diagnostic register */
#define KEY_REG			0x08	/* Key Value Capture register */

/* Key Scan Initialization Register bit defines */
#define KEY_INIT_DBNC_MASK	GENMASK(23, 16)
#define KEY_INIT_DBNC_SHIFT	16
#define KEY_INIT_DIS3KY		BIT(15)
#define KEY_INIT_DIAG		BIT(14)
#define KEY_INIT_BACK		BIT(13)
#define KEY_INIT_T2		BIT(12)
#define KEY_INIT_PRSCL_MASK	GENMASK(9, 0)
#define KEY_INIT_PRSCL_SHIFT	0

/* Key Scan Diagnostic Register bit defines */
#define KEY_DIAG_MASK		GENMASK(5, 0)
#define KEY_DIAG_SHIFT		0

/* Key Value Capture Register bit defines */
#define KEY_REG_K		BIT(15)
#define KEY_REG_INT		BIT(14)
#define KEY_REG_2KEYS		BIT(13)
#define KEY_REG_1KEY		BIT(12)
#define KEY_REG_KEY2_MASK	GENMASK(11, 6)
#define KEY_REG_KEY2_SHIFT	6
#define KEY_REG_KEY1_MASK	GENMASK(5, 0)
#define KEY_REG_KEY1_SHIFT	0

#define EP93XX_MATRIX_SIZE	(EP93XX_MATRIX_ROWS * EP93XX_MATRIX_COLS)

struct ep93xx_keypad {
	struct ep93xx_keypad_platform_data *pdata;
	struct input_dev *input_dev;
	struct clk *clk;

	void __iomem *mmio_base;

	unsigned short keycodes[EP93XX_MATRIX_SIZE];

	int key1;
	int key2;

	int irq;

	bool enabled;
};

static irqreturn_t ep93xx_keypad_irq_handler(int irq, void *dev_id)
{
	struct ep93xx_keypad *keypad = dev_id;
	struct input_dev *input_dev = keypad->input_dev;
	unsigned int status;
	int keycode, key1, key2;

	status = __raw_readl(keypad->mmio_base + KEY_REG);

	keycode = (status & KEY_REG_KEY1_MASK) >> KEY_REG_KEY1_SHIFT;
	key1 = keypad->keycodes[keycode];

	keycode = (status & KEY_REG_KEY2_MASK) >> KEY_REG_KEY2_SHIFT;
	key2 = keypad->keycodes[keycode];

	if (status & KEY_REG_2KEYS) {
		if (keypad->key1 && key1 != keypad->key1 && key2 != keypad->key1)
			input_report_key(input_dev, keypad->key1, 0);

		if (keypad->key2 && key1 != keypad->key2 && key2 != keypad->key2)
			input_report_key(input_dev, keypad->key2, 0);

		input_report_key(input_dev, key1, 1);
		input_report_key(input_dev, key2, 1);

		keypad->key1 = key1;
		keypad->key2 = key2;

	} else if (status & KEY_REG_1KEY) {
		if (keypad->key1 && key1 != keypad->key1)
			input_report_key(input_dev, keypad->key1, 0);

		if (keypad->key2 && key1 != keypad->key2)
			input_report_key(input_dev, keypad->key2, 0);

		input_report_key(input_dev, key1, 1);

		keypad->key1 = key1;
		keypad->key2 = 0;

	} else {
		input_report_key(input_dev, keypad->key1, 0);
		input_report_key(input_dev, keypad->key2, 0);

		keypad->key1 = keypad->key2 = 0;
	}
	input_sync(input_dev);

	return IRQ_HANDLED;
}

static void ep93xx_keypad_config(struct ep93xx_keypad *keypad)
{
	struct ep93xx_keypad_platform_data *pdata = keypad->pdata;
	unsigned int val = 0;

	clk_set_rate(keypad->clk, pdata->clk_rate);

	if (pdata->flags & EP93XX_KEYPAD_DISABLE_3_KEY)
		val |= KEY_INIT_DIS3KY;
	if (pdata->flags & EP93XX_KEYPAD_DIAG_MODE)
		val |= KEY_INIT_DIAG;
	if (pdata->flags & EP93XX_KEYPAD_BACK_DRIVE)
		val |= KEY_INIT_BACK;
	if (pdata->flags & EP93XX_KEYPAD_TEST_MODE)
		val |= KEY_INIT_T2;

	val |= ((pdata->debounce << KEY_INIT_DBNC_SHIFT) & KEY_INIT_DBNC_MASK);

	val |= ((pdata->prescale << KEY_INIT_PRSCL_SHIFT) & KEY_INIT_PRSCL_MASK);

	__raw_writel(val, keypad->mmio_base + KEY_INIT);
}

static int ep93xx_keypad_open(struct input_dev *pdev)
{
	struct ep93xx_keypad *keypad = input_get_drvdata(pdev);

	if (!keypad->enabled) {
		ep93xx_keypad_config(keypad);
		clk_prepare_enable(keypad->clk);
		keypad->enabled = true;
	}

	return 0;
}

static void ep93xx_keypad_close(struct input_dev *pdev)
{
	struct ep93xx_keypad *keypad = input_get_drvdata(pdev);

	if (keypad->enabled) {
		clk_disable_unprepare(keypad->clk);
		keypad->enabled = false;
	}
}


static int __maybe_unused ep93xx_keypad_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
	struct input_dev *input_dev = keypad->input_dev;

	mutex_lock(&input_dev->mutex);

	if (keypad->enabled) {
		clk_disable(keypad->clk);
		keypad->enabled = false;
	}

	mutex_unlock(&input_dev->mutex);

	return 0;
}

static int __maybe_unused ep93xx_keypad_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct ep93xx_keypad *keypad = platform_get_drvdata(pdev);
	struct input_dev *input_dev = keypad->input_dev;

	mutex_lock(&input_dev->mutex);

	if (input_device_enabled(input_dev)) {
		if (!keypad->enabled) {
			ep93xx_keypad_config(keypad);
			clk_enable(keypad->clk);
			keypad->enabled = true;
		}
	}

	mutex_unlock(&input_dev->mutex);

	return 0;
}

static SIMPLE_DEV_PM_OPS(ep93xx_keypad_pm_ops,
			 ep93xx_keypad_suspend, ep93xx_keypad_resume);

static void ep93xx_keypad_release_gpio_action(void *_pdev)
{
	struct platform_device *pdev = _pdev;

	ep93xx_keypad_release_gpio(pdev);
}

static int ep93xx_keypad_probe(struct platform_device *pdev)
{
	struct ep93xx_keypad *keypad;
	const struct matrix_keymap_data *keymap_data;
	struct input_dev *input_dev;
	int err;

	keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad), GFP_KERNEL);
	if (!keypad)
		return -ENOMEM;

	keypad->pdata = dev_get_platdata(&pdev->dev);
	if (!keypad->pdata)
		return -EINVAL;

	keymap_data = keypad->pdata->keymap_data;
	if (!keymap_data)
		return -EINVAL;

	keypad->irq = platform_get_irq(pdev, 0);
	if (keypad->irq < 0)
		return keypad->irq;

	keypad->mmio_base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(keypad->mmio_base))
		return PTR_ERR(keypad->mmio_base);

	err = ep93xx_keypad_acquire_gpio(pdev);
	if (err)
		return err;

	err = devm_add_action_or_reset(&pdev->dev,
				       ep93xx_keypad_release_gpio_action, pdev);
	if (err)
		return err;

	keypad->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(keypad->clk))
		return PTR_ERR(keypad->clk);

	input_dev = devm_input_allocate_device(&pdev->dev);
	if (!input_dev)
		return -ENOMEM;

	keypad->input_dev = input_dev;

	input_dev->name = pdev->name;
	input_dev->id.bustype = BUS_HOST;
	input_dev->open = ep93xx_keypad_open;
	input_dev->close = ep93xx_keypad_close;

	err = matrix_keypad_build_keymap(keymap_data, NULL,
					 EP93XX_MATRIX_ROWS, EP93XX_MATRIX_COLS,
					 keypad->keycodes, input_dev);
	if (err)
		return err;

	if (keypad->pdata->flags & EP93XX_KEYPAD_AUTOREPEAT)
		__set_bit(EV_REP, input_dev->evbit);
	input_set_drvdata(input_dev, keypad);

	err = devm_request_irq(&pdev->dev, keypad->irq,
			       ep93xx_keypad_irq_handler,
			       0, pdev->name, keypad);
	if (err)
		return err;

	err = input_register_device(input_dev);
	if (err)
		return err;

	platform_set_drvdata(pdev, keypad);

	device_init_wakeup(&pdev->dev, 1);
	err = dev_pm_set_wake_irq(&pdev->dev, keypad->irq);
	if (err)
		dev_warn(&pdev->dev, "failed to set up wakeup irq: %d\n", err);

	return 0;
}

static int ep93xx_keypad_remove(struct platform_device *pdev)
{
	dev_pm_clear_wake_irq(&pdev->dev);

	return 0;
}

static struct platform_driver ep93xx_keypad_driver = {
	.driver		= {
		.name	= "ep93xx-keypad",
		.pm	= &ep93xx_keypad_pm_ops,
	},
	.probe		= ep93xx_keypad_probe,
	.remove		= ep93xx_keypad_remove,
};
module_platform_driver(ep93xx_keypad_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("H Hartley Sweeten <hsweeten@visionengravers.com>");
MODULE_DESCRIPTION("EP93xx Matrix Keypad Controller");
MODULE_ALIAS("platform:ep93xx-keypad");