summaryrefslogtreecommitdiff
path: root/drivers/input/keyboard/tnetv107x-keypad.c
blob: c8f097a15d89a4865ba0c324cc63b76cec2646f9 (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
332
333
334
335
336
337
338
339
340
341
/*
 * Texas Instruments TNETV107X Keypad Driver
 *
 * Copyright (C) 2010 Texas Instruments
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/input.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/input/matrix_keypad.h>

#define BITS(x)			(BIT(x) - 1)

#define KEYPAD_ROWS		9
#define KEYPAD_COLS		9

#define DEBOUNCE_MIN		0x400ul
#define DEBOUNCE_MAX		0x3ffffffful

struct keypad_regs {
	u32	rev;
	u32	mode;
	u32	mask;
	u32	pol;
	u32	dclock;
	u32	rclock;
	u32	stable_cnt;
	u32	in_en;
	u32	out;
	u32	out_en;
	u32	in;
	u32	lock;
	u32	pres[3];
};

#define keypad_read(kp, reg)		__raw_readl(&(kp)->regs->reg)
#define keypad_write(kp, reg, val)	__raw_writel(val, &(kp)->regs->reg)

struct keypad_data {
	struct input_dev		*input_dev;
	struct resource			*res;
	struct keypad_regs __iomem	*regs;
	struct clk			*clk;
	struct device			*dev;
	spinlock_t			lock;
	u32				irq_press;
	u32				irq_release;
	int				rows, cols, row_shift;
	int				debounce_ms, active_low;
	u32				prev_keys[3];
	unsigned short			keycodes[];
};

static irqreturn_t keypad_irq(int irq, void *data)
{
	struct keypad_data *kp = data;
	int i, bit, val, row, col, code;
	unsigned long flags;
	u32 curr_keys[3];
	u32 change;

	spin_lock_irqsave(&kp->lock, flags);

	memset(curr_keys, 0, sizeof(curr_keys));
	if (irq == kp->irq_press)
		for (i = 0; i < 3; i++)
			curr_keys[i] = keypad_read(kp, pres[i]);

	for (i = 0; i < 3; i++) {
		change = curr_keys[i] ^ kp->prev_keys[i];

		while (change) {
			bit     = fls(change) - 1;
			change ^= BIT(bit);
			val     = curr_keys[i] & BIT(bit);
			bit    += i * 32;
			row     = bit / KEYPAD_COLS;
			col     = bit % KEYPAD_COLS;

			code = MATRIX_SCAN_CODE(row, col, kp->row_shift);
			input_event(kp->input_dev, EV_MSC, MSC_SCAN, code);
			input_report_key(kp->input_dev, kp->keycodes[code],
					 val);
		}
	}
	input_sync(kp->input_dev);
	memcpy(kp->prev_keys, curr_keys, sizeof(curr_keys));

	if (irq == kp->irq_press)
		keypad_write(kp, lock, 0); /* Allow hardware updates */

	spin_unlock_irqrestore(&kp->lock, flags);

	return IRQ_HANDLED;
}

static int keypad_start(struct input_dev *dev)
{
	struct keypad_data *kp = input_get_drvdata(dev);
	unsigned long mask, debounce, clk_rate_khz;
	unsigned long flags;

	clk_enable(kp->clk);
	clk_rate_khz = clk_get_rate(kp->clk) / 1000;

	spin_lock_irqsave(&kp->lock, flags);

	/* Initialize device registers */
	keypad_write(kp, mode, 0);

	mask  = BITS(kp->rows) << KEYPAD_COLS;
	mask |= BITS(kp->cols);
	keypad_write(kp, mask, ~mask);

	keypad_write(kp, pol, kp->active_low ? 0 : 0x3ffff);
	keypad_write(kp, stable_cnt, 3);

	debounce = kp->debounce_ms * clk_rate_khz;
	debounce = clamp(debounce, DEBOUNCE_MIN, DEBOUNCE_MAX);
	keypad_write(kp, dclock, debounce);
	keypad_write(kp, rclock, 4 * debounce);

	keypad_write(kp, in_en, 1);

	spin_unlock_irqrestore(&kp->lock, flags);

	return 0;
}

static void keypad_stop(struct input_dev *dev)
{
	struct keypad_data *kp = input_get_drvdata(dev);

	synchronize_irq(kp->irq_press);
	synchronize_irq(kp->irq_release);
	clk_disable(kp->clk);
}

static int __devinit keypad_probe(struct platform_device *pdev)
{
	const struct matrix_keypad_platform_data *pdata;
	const struct matrix_keymap_data *keymap_data;
	struct device *dev = &pdev->dev;
	struct keypad_data *kp;
	int error = 0, sz, row_shift;
	u32 rev = 0;

	pdata = pdev->dev.platform_data;
	if (!pdata) {
		dev_err(dev, "cannot find device data\n");
		return -EINVAL;
	}

	keymap_data = pdata->keymap_data;
	if (!keymap_data) {
		dev_err(dev, "cannot find keymap data\n");
		return -EINVAL;
	}

	row_shift = get_count_order(pdata->num_col_gpios);
	sz  = offsetof(struct keypad_data, keycodes);
	sz += (pdata->num_row_gpios << row_shift) * sizeof(kp->keycodes[0]);
	kp = kzalloc(sz, GFP_KERNEL);
	if (!kp) {
		dev_err(dev, "cannot allocate device info\n");
		return -ENOMEM;
	}

	kp->dev  = dev;
	kp->rows = pdata->num_row_gpios;
	kp->cols = pdata->num_col_gpios;
	kp->row_shift = row_shift;
	platform_set_drvdata(pdev, kp);
	spin_lock_init(&kp->lock);

	kp->irq_press   = platform_get_irq_byname(pdev, "press");
	kp->irq_release = platform_get_irq_byname(pdev, "release");
	if (kp->irq_press < 0 || kp->irq_release < 0) {
		dev_err(dev, "cannot determine device interrupts\n");
		error = -ENODEV;
		goto error_res;
	}

	kp->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!kp->res) {
		dev_err(dev, "cannot determine register area\n");
		error = -ENODEV;
		goto error_res;
	}

	if (!request_mem_region(kp->res->start, resource_size(kp->res),
				pdev->name)) {
		dev_err(dev, "cannot claim register memory\n");
		kp->res = NULL;
		error = -EINVAL;
		goto error_res;
	}

	kp->regs = ioremap(kp->res->start, resource_size(kp->res));
	if (!kp->regs) {
		dev_err(dev, "cannot map register memory\n");
		error = -ENOMEM;
		goto error_map;
	}

	kp->clk = clk_get(dev, NULL);
	if (IS_ERR(kp->clk)) {
		dev_err(dev, "cannot claim device clock\n");
		error = PTR_ERR(kp->clk);
		goto error_clk;
	}

	error = request_threaded_irq(kp->irq_press, NULL, keypad_irq, 0,
				     dev_name(dev), kp);
	if (error < 0) {
		dev_err(kp->dev, "Could not allocate keypad press key irq\n");
		goto error_irq_press;
	}

	error = request_threaded_irq(kp->irq_release, NULL, keypad_irq, 0,
				     dev_name(dev), kp);
	if (error < 0) {
		dev_err(kp->dev, "Could not allocate keypad release key irq\n");
		goto error_irq_release;
	}

	kp->input_dev = input_allocate_device();
	if (!kp->input_dev) {
		dev_err(dev, "cannot allocate input device\n");
		error = -ENOMEM;
		goto error_input;
	}
	input_set_drvdata(kp->input_dev, kp);

	kp->input_dev->name	  = pdev->name;
	kp->input_dev->dev.parent = &pdev->dev;
	kp->input_dev->open	  = keypad_start;
	kp->input_dev->close	  = keypad_stop;
	kp->input_dev->evbit[0]	  = BIT_MASK(EV_KEY);
	if (!pdata->no_autorepeat)
		kp->input_dev->evbit[0] |= BIT_MASK(EV_REP);

	clk_enable(kp->clk);
	rev = keypad_read(kp, rev);
	kp->input_dev->id.bustype = BUS_HOST;
	kp->input_dev->id.product = ((rev >>  8) & 0x07);
	kp->input_dev->id.version = ((rev >> 16) & 0xfff);
	clk_disable(kp->clk);

	kp->input_dev->keycode     = kp->keycodes;
	kp->input_dev->keycodesize = sizeof(kp->keycodes[0]);
	kp->input_dev->keycodemax  = kp->rows << kp->row_shift;

	matrix_keypad_build_keymap(keymap_data, kp->row_shift, kp->keycodes,
				   kp->input_dev->keybit);

	input_set_capability(kp->input_dev, EV_MSC, MSC_SCAN);

	error = input_register_device(kp->input_dev);
	if (error < 0) {
		dev_err(dev, "Could not register input device\n");
		goto error_reg;
	}

	return 0;


error_reg:
	input_free_device(kp->input_dev);
error_input:
	free_irq(kp->irq_release, kp);
error_irq_release:
	free_irq(kp->irq_press, kp);
error_irq_press:
	clk_put(kp->clk);
error_clk:
	iounmap(kp->regs);
error_map:
	release_mem_region(kp->res->start, resource_size(kp->res));
error_res:
	platform_set_drvdata(pdev, NULL);
	kfree(kp);
	return error;
}

static int __devexit keypad_remove(struct platform_device *pdev)
{
	struct keypad_data *kp = platform_get_drvdata(pdev);

	free_irq(kp->irq_press, kp);
	free_irq(kp->irq_release, kp);
	input_unregister_device(kp->input_dev);
	clk_put(kp->clk);
	iounmap(kp->regs);
	release_mem_region(kp->res->start, resource_size(kp->res));
	platform_set_drvdata(pdev, NULL);
	kfree(kp);

	return 0;
}

static struct platform_driver keypad_driver = {
	.probe		= keypad_probe,
	.remove		= __devexit_p(keypad_remove),
	.driver.name	= "tnetv107x-keypad",
	.driver.owner	= THIS_MODULE,
};

static int __init keypad_init(void)
{
	return platform_driver_register(&keypad_driver);
}

static void __exit keypad_exit(void)
{
	platform_driver_unregister(&keypad_driver);
}

module_init(keypad_init);
module_exit(keypad_exit);

MODULE_AUTHOR("Cyril Chemparathy");
MODULE_DESCRIPTION("TNETV107X Keypad Driver");
MODULE_ALIAS("platform: tnetv107x-keypad");
MODULE_LICENSE("GPL");