summaryrefslogtreecommitdiffstats
path: root/drivers/media/usb/au0828/au0828-input.c
blob: 3d3368202cd018fa63afe8dd43f6f0d1d82684d4 (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
387
388
389
390
391
392
393
394
395
396
397
398
// SPDX-License-Identifier: GPL-2.0+
// handle au0828 IR remotes via linux kernel input layer.
//
// Copyright (c) 2014 Mauro Carvalho Chehab <mchehab@samsung.com>
// Copyright (c) 2014 Samsung Electronics Co., Ltd.
//
// Based on em28xx-input.c.

#include "au0828.h"

#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/usb.h>
#include <linux/slab.h>
#include <media/rc-core.h>

static int disable_ir;
module_param(disable_ir,        int, 0444);
MODULE_PARM_DESC(disable_ir, "disable infrared remote support");

struct au0828_rc {
	struct au0828_dev *dev;
	struct rc_dev *rc;
	char name[32];
	char phys[32];

	/* poll decoder */
	int polling;
	struct delayed_work work;

	/* i2c slave address of external device (if used) */
	u16 i2c_dev_addr;

	int  (*get_key_i2c)(struct au0828_rc *ir);
};

/*
 * AU8522 has a builtin IR receiver. Add functions to get IR from it
 */

static int au8522_rc_write(struct au0828_rc *ir, u16 reg, u8 data)
{
	int rc;
	char buf[] = { (reg >> 8) | 0x80, reg & 0xff, data };
	struct i2c_msg msg = { .addr = ir->i2c_dev_addr, .flags = 0,
			       .buf = buf, .len = sizeof(buf) };

	rc = i2c_transfer(ir->dev->i2c_client.adapter, &msg, 1);

	if (rc < 0)
		return rc;

	return (rc == 1) ? 0 : -EIO;
}

static int au8522_rc_read(struct au0828_rc *ir, u16 reg, int val,
				 char *buf, int size)
{
	int rc;
	char obuf[3];
	struct i2c_msg msg[2] = { { .addr = ir->i2c_dev_addr, .flags = 0,
				    .buf = obuf, .len = 2 },
				  { .addr = ir->i2c_dev_addr, .flags = I2C_M_RD,
				    .buf = buf, .len = size } };

	obuf[0] = 0x40 | reg >> 8;
	obuf[1] = reg & 0xff;
	if (val >= 0) {
		obuf[2] = val;
		msg[0].len++;
	}

	rc = i2c_transfer(ir->dev->i2c_client.adapter, msg, 2);

	if (rc < 0)
		return rc;

	return (rc == 2) ? 0 : -EIO;
}

static int au8522_rc_andor(struct au0828_rc *ir, u16 reg, u8 mask, u8 value)
{
	int rc;
	char buf, oldbuf;

	rc = au8522_rc_read(ir, reg, -1, &buf, 1);
	if (rc < 0)
		return rc;

	oldbuf = buf;
	buf = (buf & ~mask) | (value & mask);

	/* Nothing to do, just return */
	if (buf == oldbuf)
		return 0;

	return au8522_rc_write(ir, reg, buf);
}

#define au8522_rc_set(ir, reg, bit) au8522_rc_andor(ir, (reg), (bit), (bit))
#define au8522_rc_clear(ir, reg, bit) au8522_rc_andor(ir, (reg), (bit), 0)

/* Remote Controller time units */

#define AU8522_UNIT		200 /* us */
#define NEC_START_SPACE		(4500 / AU8522_UNIT)
#define NEC_START_PULSE		(563 * 16)
#define RC5_START_SPACE		(4 * AU8522_UNIT)
#define RC5_START_PULSE		889

static int au0828_get_key_au8522(struct au0828_rc *ir)
{
	unsigned char buf[40];
	struct ir_raw_event rawir = {};
	int i, j, rc;
	int prv_bit, bit, width;
	bool first = true;

	/* do nothing if device is disconnected */
	if (test_bit(DEV_DISCONNECTED, &ir->dev->dev_state))
		return 0;

	/* Check IR int */
	rc = au8522_rc_read(ir, 0xe1, -1, buf, 1);
	if (rc < 0 || !(buf[0] & (1 << 4))) {
		/* Be sure that IR is enabled */
		au8522_rc_set(ir, 0xe0, 1 << 4);
		return 0;
	}

	/* Something arrived. Get the data */
	rc = au8522_rc_read(ir, 0xe3, 0x11, buf, sizeof(buf));


	if (rc < 0)
		return rc;

	/* Disable IR */
	au8522_rc_clear(ir, 0xe0, 1 << 4);

	/* Enable IR */
	au8522_rc_set(ir, 0xe0, 1 << 4);

	dprintk(16, "RC data received: %*ph\n", 40, buf);

	prv_bit = (buf[0] >> 7) & 0x01;
	width = 0;
	for (i = 0; i < sizeof(buf); i++) {
		for (j = 7; j >= 0; j--) {
			bit = (buf[i] >> j) & 0x01;
			if (bit == prv_bit) {
				width++;
				continue;
			}

			/*
			 * Fix an au8522 bug: the first pulse event
			 * is lost. So, we need to fake it, based on the
			 * protocol. That means that not all raw decoders
			 * will work, as we need to add a hack for each
			 * protocol, based on the first space.
			 * So, we only support RC5 and NEC.
			 */

			if (first) {
				first = false;

				rawir.pulse = true;
				if (width > NEC_START_SPACE - 2 &&
				    width < NEC_START_SPACE + 2) {
					/* NEC protocol */
					rawir.duration = NEC_START_PULSE;
					dprintk(16, "Storing NEC start %s with duration %d",
						rawir.pulse ? "pulse" : "space",
						rawir.duration);
				} else {
					/* RC5 protocol */
					rawir.duration = RC5_START_PULSE;
					dprintk(16, "Storing RC5 start %s with duration %d",
						rawir.pulse ? "pulse" : "space",
						rawir.duration);
				}
				ir_raw_event_store(ir->rc, &rawir);
			}

			rawir.pulse = prv_bit ? false : true;
			rawir.duration = AU8522_UNIT * width;
			dprintk(16, "Storing %s with duration %d",
				rawir.pulse ? "pulse" : "space",
				rawir.duration);
			ir_raw_event_store(ir->rc, &rawir);

			width = 1;
			prv_bit = bit;
		}
	}

	rawir.pulse = prv_bit ? false : true;
	rawir.duration = AU8522_UNIT * width;
	dprintk(16, "Storing end %s with duration %d",
		rawir.pulse ? "pulse" : "space",
		rawir.duration);
	ir_raw_event_store(ir->rc, &rawir);

	ir_raw_event_handle(ir->rc);

	return 1;
}

/*
 * Generic IR code
 */

static void au0828_rc_work(struct work_struct *work)
{
	struct au0828_rc *ir = container_of(work, struct au0828_rc, work.work);
	int rc;

	rc = ir->get_key_i2c(ir);
	if (rc < 0)
		pr_info("Error while getting RC scancode\n");

	schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
}

static int au0828_rc_start(struct rc_dev *rc)
{
	struct au0828_rc *ir = rc->priv;

	INIT_DELAYED_WORK(&ir->work, au0828_rc_work);

	/* Enable IR */
	au8522_rc_set(ir, 0xe0, 1 << 4);

	schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));

	return 0;
}

static void au0828_rc_stop(struct rc_dev *rc)
{
	struct au0828_rc *ir = rc->priv;

	cancel_delayed_work_sync(&ir->work);

	/* do nothing if device is disconnected */
	if (!test_bit(DEV_DISCONNECTED, &ir->dev->dev_state)) {
		/* Disable IR */
		au8522_rc_clear(ir, 0xe0, 1 << 4);
	}
}

static int au0828_probe_i2c_ir(struct au0828_dev *dev)
{
	int i = 0;
	static const unsigned short addr_list[] = {
		 0x47, I2C_CLIENT_END
	};

	while (addr_list[i] != I2C_CLIENT_END) {
		if (i2c_probe_func_quick_read(dev->i2c_client.adapter,
					      addr_list[i]) == 1)
			return addr_list[i];
		i++;
	}

	return -ENODEV;
}

int au0828_rc_register(struct au0828_dev *dev)
{
	struct au0828_rc *ir;
	struct rc_dev *rc;
	int err = -ENOMEM;
	u16 i2c_rc_dev_addr = 0;

	if (!dev->board.has_ir_i2c || disable_ir)
		return 0;

	i2c_rc_dev_addr = au0828_probe_i2c_ir(dev);
	if (!i2c_rc_dev_addr)
		return -ENODEV;

	ir = kzalloc(sizeof(*ir), GFP_KERNEL);
	rc = rc_allocate_device(RC_DRIVER_IR_RAW);
	if (!ir || !rc)
		goto error;

	/* record handles to ourself */
	ir->dev = dev;
	dev->ir = ir;
	ir->rc = rc;

	rc->priv = ir;
	rc->open = au0828_rc_start;
	rc->close = au0828_rc_stop;

	if (dev->board.has_ir_i2c) {	/* external i2c device */
		switch (dev->boardnr) {
		case AU0828_BOARD_HAUPPAUGE_HVR950Q:
			rc->map_name = RC_MAP_HAUPPAUGE;
			ir->get_key_i2c = au0828_get_key_au8522;
			break;
		default:
			err = -ENODEV;
			goto error;
		}

		ir->i2c_dev_addr = i2c_rc_dev_addr;
	}

	/* This is how often we ask the chip for IR information */
	ir->polling = 100; /* ms */

	/* init input device */
	snprintf(ir->name, sizeof(ir->name), "au0828 IR (%s)",
		 dev->board.name);

	usb_make_path(dev->usbdev, ir->phys, sizeof(ir->phys));
	strlcat(ir->phys, "/input0", sizeof(ir->phys));

	rc->device_name = ir->name;
	rc->input_phys = ir->phys;
	rc->input_id.bustype = BUS_USB;
	rc->input_id.version = 1;
	rc->input_id.vendor = le16_to_cpu(dev->usbdev->descriptor.idVendor);
	rc->input_id.product = le16_to_cpu(dev->usbdev->descriptor.idProduct);
	rc->dev.parent = &dev->usbdev->dev;
	rc->driver_name = "au0828-input";
	rc->allowed_protocols = RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX |
				RC_PROTO_BIT_NEC32 | RC_PROTO_BIT_RC5;

	/* all done */
	err = rc_register_device(rc);
	if (err)
		goto error;

	pr_info("Remote controller %s initialized\n", ir->name);

	return 0;

error:
	dev->ir = NULL;
	rc_free_device(rc);
	kfree(ir);
	return err;
}

void au0828_rc_unregister(struct au0828_dev *dev)
{
	struct au0828_rc *ir = dev->ir;

	/* skip detach on non attached boards */
	if (!ir)
		return;

	rc_unregister_device(ir->rc);

	/* done */
	kfree(ir);
	dev->ir = NULL;
}

int au0828_rc_suspend(struct au0828_dev *dev)
{
	struct au0828_rc *ir = dev->ir;

	if (!ir)
		return 0;

	pr_info("Stopping RC\n");

	cancel_delayed_work_sync(&ir->work);

	/* Disable IR */
	au8522_rc_clear(ir, 0xe0, 1 << 4);

	return 0;
}

int au0828_rc_resume(struct au0828_dev *dev)
{
	struct au0828_rc *ir = dev->ir;

	if (!ir)
		return 0;

	pr_info("Restarting RC\n");

	/* Enable IR */
	au8522_rc_set(ir, 0xe0, 1 << 4);

	schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));

	return 0;
}