aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/input/keyboard/stmpe-keypad.c
blob: ab7610ca10ebebd92817b641e0d4e77b1ddd2267 (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
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * License Terms: GNU General Public License, version 2
 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/input/matrix_keypad.h>
#include <linux/mfd/stmpe.h>

/* These are at the same addresses in all STMPE variants */
#define STMPE_KPC_COL			0x60
#define STMPE_KPC_ROW_MSB		0x61
#define STMPE_KPC_ROW_LSB		0x62
#define STMPE_KPC_CTRL_MSB		0x63
#define STMPE_KPC_CTRL_LSB		0x64
#define STMPE_KPC_COMBI_KEY_0		0x65
#define STMPE_KPC_COMBI_KEY_1		0x66
#define STMPE_KPC_COMBI_KEY_2		0x67
#define STMPE_KPC_DATA_BYTE0		0x68
#define STMPE_KPC_DATA_BYTE1		0x69
#define STMPE_KPC_DATA_BYTE2		0x6a
#define STMPE_KPC_DATA_BYTE3		0x6b
#define STMPE_KPC_DATA_BYTE4		0x6c

#define STMPE_KPC_CTRL_LSB_SCAN		(0x1 << 0)
#define STMPE_KPC_CTRL_LSB_DEBOUNCE	(0x7f << 1)
#define STMPE_KPC_CTRL_MSB_SCAN_COUNT	(0xf << 4)

#define STMPE_KPC_ROW_MSB_ROWS		0xff

#define STMPE_KPC_DATA_UP		(0x1 << 7)
#define STMPE_KPC_DATA_ROW		(0xf << 3)
#define STMPE_KPC_DATA_COL		(0x7 << 0)
#define STMPE_KPC_DATA_NOKEY_MASK	0x78

#define STMPE_KEYPAD_MAX_DEBOUNCE	127
#define STMPE_KEYPAD_MAX_SCAN_COUNT	15

#define STMPE_KEYPAD_MAX_ROWS		8
#define STMPE_KEYPAD_MAX_COLS		8
#define STMPE_KEYPAD_ROW_SHIFT		3
#define STMPE_KEYPAD_KEYMAP_SIZE	\
	(STMPE_KEYPAD_MAX_ROWS * STMPE_KEYPAD_MAX_COLS)

/**
 * struct stmpe_keypad_variant - model-specific attributes
 * @auto_increment: whether the KPC_DATA_BYTE register address
 *		    auto-increments on multiple read
 * @num_data: number of data bytes
 * @num_normal_data: number of normal keys' data bytes
 * @max_cols: maximum number of columns supported
 * @max_rows: maximum number of rows supported
 * @col_gpios: bitmask of gpios which can be used for columns
 * @row_gpios: bitmask of gpios which can be used for rows
 */
struct stmpe_keypad_variant {
	bool		auto_increment;
	int		num_data;
	int		num_normal_data;
	int		max_cols;
	int		max_rows;
	unsigned int	col_gpios;
	unsigned int	row_gpios;
};

static const struct stmpe_keypad_variant stmpe_keypad_variants[] = {
	[STMPE1601] = {
		.auto_increment		= true,
		.num_data		= 5,
		.num_normal_data	= 3,
		.max_cols		= 8,
		.max_rows		= 8,
		.col_gpios		= 0x000ff,	/* GPIO 0 - 7 */
		.row_gpios		= 0x0ff00,	/* GPIO 8 - 15 */
	},
	[STMPE2401] = {
		.auto_increment		= false,
		.num_data		= 3,
		.num_normal_data	= 2,
		.max_cols		= 8,
		.max_rows		= 12,
		.col_gpios		= 0x0000ff,	/* GPIO 0 - 7*/
		.row_gpios		= 0x1fef00,	/* GPIO 8-14, 16-20 */
	},
	[STMPE2403] = {
		.auto_increment		= true,
		.num_data		= 5,
		.num_normal_data	= 3,
		.max_cols		= 8,
		.max_rows		= 12,
		.col_gpios		= 0x0000ff,	/* GPIO 0 - 7*/
		.row_gpios		= 0x1fef00,	/* GPIO 8-14, 16-20 */
	},
};

struct stmpe_keypad {
	struct stmpe *stmpe;
	struct input_dev *input;
	const struct stmpe_keypad_variant *variant;
	const struct stmpe_keypad_platform_data *plat;

	unsigned int rows;
	unsigned int cols;

	unsigned short keymap[STMPE_KEYPAD_KEYMAP_SIZE];
};

static int stmpe_keypad_read_data(struct stmpe_keypad *keypad, u8 *data)
{
	const struct stmpe_keypad_variant *variant = keypad->variant;
	struct stmpe *stmpe = keypad->stmpe;
	int ret;
	int i;

	if (variant->auto_increment)
		return stmpe_block_read(stmpe, STMPE_KPC_DATA_BYTE0,
					variant->num_data, data);

	for (i = 0; i < variant->num_data; i++) {
		ret = stmpe_reg_read(stmpe, STMPE_KPC_DATA_BYTE0 + i);
		if (ret < 0)
			return ret;

		data[i] = ret;
	}

	return 0;
}

static irqreturn_t stmpe_keypad_irq(int irq, void *dev)
{
	struct stmpe_keypad *keypad = dev;
	struct input_dev *input = keypad->input;
	const struct stmpe_keypad_variant *variant = keypad->variant;
	u8 fifo[variant->num_data];
	int ret;
	int i;

	ret = stmpe_keypad_read_data(keypad, fifo);
	if (ret < 0)
		return IRQ_NONE;

	for (i = 0; i < variant->num_normal_data; i++) {
		u8 data = fifo[i];
		int row = (data & STMPE_KPC_DATA_ROW) >> 3;
		int col = data & STMPE_KPC_DATA_COL;
		int code = MATRIX_SCAN_CODE(row, col, STMPE_KEYPAD_ROW_SHIFT);
		bool up = data & STMPE_KPC_DATA_UP;

		if ((data & STMPE_KPC_DATA_NOKEY_MASK)
			== STMPE_KPC_DATA_NOKEY_MASK)
			continue;

		input_event(input, EV_MSC, MSC_SCAN, code);
		input_report_key(input, keypad->keymap[code], !up);
		input_sync(input);
	}

	return IRQ_HANDLED;
}

static int __devinit stmpe_keypad_altfunc_init(struct stmpe_keypad *keypad)
{
	const struct stmpe_keypad_variant *variant = keypad->variant;
	unsigned int col_gpios = variant->col_gpios;
	unsigned int row_gpios = variant->row_gpios;
	struct stmpe *stmpe = keypad->stmpe;
	unsigned int pins = 0;
	int i;

	/*
	 * Figure out which pins need to be set to the keypad alternate
	 * function.
	 *
	 * {cols,rows}_gpios are bitmasks of which pins on the chip can be used
	 * for the keypad.
	 *
	 * keypad->{cols,rows} are a bitmask of which pins (of the ones useable
	 * for the keypad) are used on the board.
	 */

	for (i = 0; i < variant->max_cols; i++) {
		int num = __ffs(col_gpios);

		if (keypad->cols & (1 << i))
			pins |= 1 << num;

		col_gpios &= ~(1 << num);
	}

	for (i = 0; i < variant->max_rows; i++) {
		int num = __ffs(row_gpios);

		if (keypad->rows & (1 << i))
			pins |= 1 << num;

		row_gpios &= ~(1 << num);
	}

	return stmpe_set_altfunc(stmpe, pins, STMPE_BLOCK_KEYPAD);
}

static int __devinit stmpe_keypad_chip_init(struct stmpe_keypad *keypad)
{
	const struct stmpe_keypad_platform_data *plat = keypad->plat;
	const struct stmpe_keypad_variant *variant = keypad->variant;
	struct stmpe *stmpe = keypad->stmpe;
	int ret;

	if (plat->debounce_ms > STMPE_KEYPAD_MAX_DEBOUNCE)
		return -EINVAL;

	if (plat->scan_count > STMPE_KEYPAD_MAX_SCAN_COUNT)
		return -EINVAL;

	ret = stmpe_enable(stmpe, STMPE_BLOCK_KEYPAD);
	if (ret < 0)
		return ret;

	ret = stmpe_keypad_altfunc_init(keypad);
	if (ret < 0)
		return ret;

	ret = stmpe_reg_write(stmpe, STMPE_KPC_COL, keypad->cols);
	if (ret < 0)
		return ret;

	ret = stmpe_reg_write(stmpe, STMPE_KPC_ROW_LSB, keypad->rows);
	if (ret < 0)
		return ret;

	if (variant->max_rows > 8) {
		ret = stmpe_set_bits(stmpe, STMPE_KPC_ROW_MSB,
				     STMPE_KPC_ROW_MSB_ROWS,
				     keypad->rows >> 8);
		if (ret < 0)
			return ret;
	}

	ret = stmpe_set_bits(stmpe, STMPE_KPC_CTRL_MSB,
			     STMPE_KPC_CTRL_MSB_SCAN_COUNT,
			     plat->scan_count << 4);
	if (ret < 0)
		return ret;

	return stmpe_set_bits(stmpe, STMPE_KPC_CTRL_LSB,
			      STMPE_KPC_CTRL_LSB_SCAN |
			      STMPE_KPC_CTRL_LSB_DEBOUNCE,
			      STMPE_KPC_CTRL_LSB_SCAN |
			      (plat->debounce_ms << 1));
}

static int __devinit stmpe_keypad_probe(struct platform_device *pdev)
{
	struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
	struct stmpe_keypad_platform_data *plat;
	struct stmpe_keypad *keypad;
	struct input_dev *input;
	int ret;
	int irq;
	int i;

	plat = stmpe->pdata->keypad;
	if (!plat)
		return -ENODEV;

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

	keypad = kzalloc(sizeof(struct stmpe_keypad), GFP_KERNEL);
	if (!keypad)
		return -ENOMEM;

	input = input_allocate_device();
	if (!input) {
		ret = -ENOMEM;
		goto out_freekeypad;
	}

	input->name = "STMPE keypad";
	input->id.bustype = BUS_I2C;
	input->dev.parent = &pdev->dev;

	input_set_capability(input, EV_MSC, MSC_SCAN);

	__set_bit(EV_KEY, input->evbit);
	if (!plat->no_autorepeat)
		__set_bit(EV_REP, input->evbit);

	input->keycode = keypad->keymap;
	input->keycodesize = sizeof(keypad->keymap[0]);
	input->keycodemax = ARRAY_SIZE(keypad->keymap);

	matrix_keypad_build_keymap(plat->keymap_data, STMPE_KEYPAD_ROW_SHIFT,
				   input->keycode, input->keybit);

	for (i = 0; i < plat->keymap_data->keymap_size; i++) {
		unsigned int key = plat->keymap_data->keymap[i];

		keypad->cols |= 1 << KEY_COL(key);
		keypad->rows |= 1 << KEY_ROW(key);
	}

	keypad->stmpe = stmpe;
	keypad->plat = plat;
	keypad->input = input;
	keypad->variant = &stmpe_keypad_variants[stmpe->partnum];

	ret = stmpe_keypad_chip_init(keypad);
	if (ret < 0)
		goto out_freeinput;

	ret = input_register_device(input);
	if (ret) {
		dev_err(&pdev->dev,
			"unable to register input device: %d\n", ret);
		goto out_freeinput;
	}

	ret = request_threaded_irq(irq, NULL, stmpe_keypad_irq, IRQF_ONESHOT,
				   "stmpe-keypad", keypad);
	if (ret) {
		dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
		goto out_unregisterinput;
	}

	platform_set_drvdata(pdev, keypad);

	return 0;

out_unregisterinput:
	input_unregister_device(input);
	input = NULL;
out_freeinput:
	input_free_device(input);
out_freekeypad:
	kfree(keypad);
	return ret;
}

static int __devexit stmpe_keypad_remove(struct platform_device *pdev)
{
	struct stmpe_keypad *keypad = platform_get_drvdata(pdev);
	struct stmpe *stmpe = keypad->stmpe;
	int irq = platform_get_irq(pdev, 0);

	stmpe_disable(stmpe, STMPE_BLOCK_KEYPAD);

	free_irq(irq, keypad);
	input_unregister_device(keypad->input);
	platform_set_drvdata(pdev, NULL);
	kfree(keypad);

	return 0;
}

static struct platform_driver stmpe_keypad_driver = {
	.driver.name	= "stmpe-keypad",
	.driver.owner	= THIS_MODULE,
	.probe		= stmpe_keypad_probe,
	.remove		= __devexit_p(stmpe_keypad_remove),
};

static int __init stmpe_keypad_init(void)
{
	return platform_driver_register(&stmpe_keypad_driver);
}
module_init(stmpe_keypad_init);

static void __exit stmpe_keypad_exit(void)
{
	platform_driver_unregister(&stmpe_keypad_driver);
}
module_exit(stmpe_keypad_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("STMPExxxx keypad driver");
MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");