aboutsummaryrefslogtreecommitdiff
path: root/drivers/input/misc/bfin_rotary.c
blob: 61d10177fa83750b0162468956742564466e9e25 (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
/*
 * Rotary counter driver for Analog Devices Blackfin Processors
 *
 * Copyright 2008-2009 Analog Devices Inc.
 * Licensed under the GPL-2 or later.
 */

#include <linux/module.h>
#include <linux/version.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/pm.h>
#include <linux/platform_device.h>
#include <linux/input.h>

#include <asm/portmux.h>
#include <asm/bfin_rotary.h>

static const u16 per_cnt[] = {
	P_CNT_CUD,
	P_CNT_CDG,
	P_CNT_CZM,
	0
};

struct bfin_rot {
	struct input_dev *input;
	int irq;
	unsigned int up_key;
	unsigned int down_key;
	unsigned int button_key;
	unsigned int rel_code;
	unsigned short cnt_config;
	unsigned short cnt_imask;
	unsigned short cnt_debounce;
};

static void report_key_event(struct input_dev *input, int keycode)
{
	/* simulate a press-n-release */
	input_report_key(input, keycode, 1);
	input_sync(input);
	input_report_key(input, keycode, 0);
	input_sync(input);
}

static void report_rotary_event(struct bfin_rot *rotary, int delta)
{
	struct input_dev *input = rotary->input;

	if (rotary->up_key) {
		report_key_event(input,
				 delta > 0 ? rotary->up_key : rotary->down_key);
	} else {
		input_report_rel(input, rotary->rel_code, delta);
		input_sync(input);
	}
}

static irqreturn_t bfin_rotary_isr(int irq, void *dev_id)
{
	struct platform_device *pdev = dev_id;
	struct bfin_rot *rotary = platform_get_drvdata(pdev);
	int delta;

	switch (bfin_read_CNT_STATUS()) {

	case ICII:
		break;

	case UCII:
	case DCII:
		delta = bfin_read_CNT_COUNTER();
		if (delta)
			report_rotary_event(rotary, delta);
		break;

	case CZMII:
		report_key_event(rotary->input, rotary->button_key);
		break;

	default:
		break;
	}

	bfin_write_CNT_COMMAND(W1LCNT_ZERO);	/* Clear COUNTER */
	bfin_write_CNT_STATUS(-1);	/* Clear STATUS */

	return IRQ_HANDLED;
}

static int __devinit bfin_rotary_probe(struct platform_device *pdev)
{
	struct bfin_rotary_platform_data *pdata = pdev->dev.platform_data;
	struct bfin_rot *rotary;
	struct input_dev *input;
	int error;

	/* Basic validation */
	if ((pdata->rotary_up_key && !pdata->rotary_down_key) ||
	    (!pdata->rotary_up_key && pdata->rotary_down_key)) {
		return -EINVAL;
	}

	error = peripheral_request_list(per_cnt, dev_name(&pdev->dev));
	if (error) {
		dev_err(&pdev->dev, "requesting peripherals failed\n");
		return error;
	}

	rotary = kzalloc(sizeof(struct bfin_rot), GFP_KERNEL);
	input = input_allocate_device();
	if (!rotary || !input) {
		error = -ENOMEM;
		goto out1;
	}

	rotary->input = input;

	rotary->up_key = pdata->rotary_up_key;
	rotary->down_key = pdata->rotary_down_key;
	rotary->button_key = pdata->rotary_button_key;
	rotary->rel_code = pdata->rotary_rel_code;

	error = rotary->irq = platform_get_irq(pdev, 0);
	if (error < 0)
		goto out1;

	input->name = pdev->name;
	input->phys = "bfin-rotary/input0";
	input->dev.parent = &pdev->dev;

	input_set_drvdata(input, rotary);

	input->id.bustype = BUS_HOST;
	input->id.vendor = 0x0001;
	input->id.product = 0x0001;
	input->id.version = 0x0100;

	if (rotary->up_key) {
		__set_bit(EV_KEY, input->evbit);
		__set_bit(rotary->up_key, input->keybit);
		__set_bit(rotary->down_key, input->keybit);
	} else {
		__set_bit(EV_REL, input->evbit);
		__set_bit(rotary->rel_code, input->relbit);
	}

	if (rotary->button_key) {
		__set_bit(EV_KEY, input->evbit);
		__set_bit(rotary->button_key, input->keybit);
	}

	error = request_irq(rotary->irq, bfin_rotary_isr,
			    0, dev_name(&pdev->dev), pdev);
	if (error) {
		dev_err(&pdev->dev,
			"unable to claim irq %d; error %d\n",
			rotary->irq, error);
		goto out1;
	}

	error = input_register_device(input);
	if (error) {
		dev_err(&pdev->dev,
			"unable to register input device (%d)\n", error);
		goto out2;
	}

	if (pdata->rotary_button_key)
		bfin_write_CNT_IMASK(CZMIE);

	if (pdata->mode & ROT_DEBE)
		bfin_write_CNT_DEBOUNCE(pdata->debounce & DPRESCALE);

	if (pdata->mode)
		bfin_write_CNT_CONFIG(bfin_read_CNT_CONFIG() |
					(pdata->mode & ~CNTE));

	bfin_write_CNT_IMASK(bfin_read_CNT_IMASK() | UCIE | DCIE);
	bfin_write_CNT_CONFIG(bfin_read_CNT_CONFIG() | CNTE);

	platform_set_drvdata(pdev, rotary);
	device_init_wakeup(&pdev->dev, 1);

	return 0;

out2:
	free_irq(rotary->irq, pdev);
out1:
	input_free_device(input);
	kfree(rotary);
	peripheral_free_list(per_cnt);

	return error;
}

static int __devexit bfin_rotary_remove(struct platform_device *pdev)
{
	struct bfin_rot *rotary = platform_get_drvdata(pdev);

	bfin_write_CNT_CONFIG(0);
	bfin_write_CNT_IMASK(0);

	free_irq(rotary->irq, pdev);
	input_unregister_device(rotary->input);
	peripheral_free_list(per_cnt);

	kfree(rotary);
	platform_set_drvdata(pdev, NULL);

	return 0;
}

#ifdef CONFIG_PM
static int bfin_rotary_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct bfin_rot *rotary = platform_get_drvdata(pdev);

	rotary->cnt_config = bfin_read_CNT_CONFIG();
	rotary->cnt_imask = bfin_read_CNT_IMASK();
	rotary->cnt_debounce = bfin_read_CNT_DEBOUNCE();

	if (device_may_wakeup(&pdev->dev))
		enable_irq_wake(rotary->irq);

	return 0;
}

static int bfin_rotary_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct bfin_rot *rotary = platform_get_drvdata(pdev);

	bfin_write_CNT_DEBOUNCE(rotary->cnt_debounce);
	bfin_write_CNT_IMASK(rotary->cnt_imask);
	bfin_write_CNT_CONFIG(rotary->cnt_config & ~CNTE);

	if (device_may_wakeup(&pdev->dev))
		disable_irq_wake(rotary->irq);

	if (rotary->cnt_config & CNTE)
		bfin_write_CNT_CONFIG(rotary->cnt_config);

	return 0;
}

static const struct dev_pm_ops bfin_rotary_pm_ops = {
	.suspend	= bfin_rotary_suspend,
	.resume		= bfin_rotary_resume,
};
#endif

static struct platform_driver bfin_rotary_device_driver = {
	.probe		= bfin_rotary_probe,
	.remove		= __devexit_p(bfin_rotary_remove),
	.driver		= {
		.name	= "bfin-rotary",
		.owner	= THIS_MODULE,
#ifdef CONFIG_PM
		.pm	= &bfin_rotary_pm_ops,
#endif
	},
};

static int __init bfin_rotary_init(void)
{
	return platform_driver_register(&bfin_rotary_device_driver);
}
module_init(bfin_rotary_init);

static void __exit bfin_rotary_exit(void)
{
	platform_driver_unregister(&bfin_rotary_device_driver);
}
module_exit(bfin_rotary_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Rotary Counter driver for Blackfin Processors");
MODULE_ALIAS("platform:bfin-rotary");