aboutsummaryrefslogtreecommitdiff
path: root/drivers/media/video/cx23885/cx23885-input.c
blob: 199b9964bbe5ab27776b9dd2f9d2d59dd96c9a2b (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
/*
 *  Driver for the Conexant CX23885/7/8 PCIe bridge
 *
 *  Infrared remote control input device
 *
 *  Most of this file is
 *
 *  Copyright (C) 2009  Andy Walls <awalls@md.metrocast.net>
 *
 *  However, the cx23885_input_{init,fini} functions contained herein are
 *  derived from Linux kernel files linux/media/video/.../...-input.c marked as:
 *
 *  Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
 *  Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
 *		       Markus Rechberger <mrechberger@gmail.com>
 *		       Mauro Carvalho Chehab <mchehab@infradead.org>
 *		       Sascha Sommer <saschasommer@freenet.de>
 *  Copyright (C) 2004, 2005 Chris Pascoe
 *  Copyright (C) 2003, 2004 Gerd Knorr
 *  Copyright (C) 2003 Pavel Machek
 *
 *  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; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 *  02110-1301, USA.
 */

#include <linux/slab.h>
#include <media/rc-core.h>
#include <media/v4l2-subdev.h>

#include "cx23885.h"

#define MODULE_NAME "cx23885"

static void cx23885_input_process_measurements(struct cx23885_dev *dev,
					       bool overrun)
{
	struct cx23885_kernel_ir *kernel_ir = dev->kernel_ir;

	ssize_t num;
	int count, i;
	bool handle = false;
	struct ir_raw_event ir_core_event[64];

	do {
		num = 0;
		v4l2_subdev_call(dev->sd_ir, ir, rx_read, (u8 *) ir_core_event,
				 sizeof(ir_core_event), &num);

		count = num / sizeof(struct ir_raw_event);

		for (i = 0; i < count; i++) {
			ir_raw_event_store(kernel_ir->rc,
					   &ir_core_event[i]);
			handle = true;
		}
	} while (num != 0);

	if (overrun)
		ir_raw_event_reset(kernel_ir->rc);
	else if (handle)
		ir_raw_event_handle(kernel_ir->rc);
}

void cx23885_input_rx_work_handler(struct cx23885_dev *dev, u32 events)
{
	struct v4l2_subdev_ir_parameters params;
	int overrun, data_available;

	if (dev->sd_ir == NULL || events == 0)
		return;

	switch (dev->board) {
	case CX23885_BOARD_HAUPPAUGE_HVR1850:
	case CX23885_BOARD_HAUPPAUGE_HVR1290:
	case CX23885_BOARD_TEVII_S470:
	case CX23885_BOARD_HAUPPAUGE_HVR1250:
		/*
		 * The only boards we handle right now.  However other boards
		 * using the CX2388x integrated IR controller should be similar
		 */
		break;
	default:
		return;
	}

	overrun = events & (V4L2_SUBDEV_IR_RX_SW_FIFO_OVERRUN |
			    V4L2_SUBDEV_IR_RX_HW_FIFO_OVERRUN);

	data_available = events & (V4L2_SUBDEV_IR_RX_END_OF_RX_DETECTED |
				   V4L2_SUBDEV_IR_RX_FIFO_SERVICE_REQ);

	if (overrun) {
		/* If there was a FIFO overrun, stop the device */
		v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
		params.enable = false;
		/* Mitigate race with cx23885_input_ir_stop() */
		params.shutdown = atomic_read(&dev->ir_input_stopping);
		v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
	}

	if (data_available)
		cx23885_input_process_measurements(dev, overrun);

	if (overrun) {
		/* If there was a FIFO overrun, clear & restart the device */
		params.enable = true;
		/* Mitigate race with cx23885_input_ir_stop() */
		params.shutdown = atomic_read(&dev->ir_input_stopping);
		v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
	}
}

static int cx23885_input_ir_start(struct cx23885_dev *dev)
{
	struct v4l2_subdev_ir_parameters params;

	if (dev->sd_ir == NULL)
		return -ENODEV;

	atomic_set(&dev->ir_input_stopping, 0);

	v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
	switch (dev->board) {
	case CX23885_BOARD_HAUPPAUGE_HVR1850:
	case CX23885_BOARD_HAUPPAUGE_HVR1290:
	case CX23885_BOARD_HAUPPAUGE_HVR1250:
		/*
		 * The IR controller on this board only returns pulse widths.
		 * Any other mode setting will fail to set up the device.
		*/
		params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
		params.enable = true;
		params.interrupt_enable = true;
		params.shutdown = false;

		/* Setup for baseband compatible with both RC-5 and RC-6A */
		params.modulation = false;
		/* RC-5:  2,222,222 ns = 1/36 kHz * 32 cycles * 2 marks * 1.25*/
		/* RC-6A: 3,333,333 ns = 1/36 kHz * 16 cycles * 6 marks * 1.25*/
		params.max_pulse_width = 3333333; /* ns */
		/* RC-5:    666,667 ns = 1/36 kHz * 32 cycles * 1 mark * 0.75 */
		/* RC-6A:   333,333 ns = 1/36 kHz * 16 cycles * 1 mark * 0.75 */
		params.noise_filter_min_width = 333333; /* ns */
		/*
		 * This board has inverted receive sense:
		 * mark is received as low logic level;
		 * falling edges are detected as rising edges; etc.
		 */
		params.invert_level = true;
		break;
	case CX23885_BOARD_TEVII_S470:
		/*
		 * The IR controller on this board only returns pulse widths.
		 * Any other mode setting will fail to set up the device.
		 */
		params.mode = V4L2_SUBDEV_IR_MODE_PULSE_WIDTH;
		params.enable = true;
		params.interrupt_enable = true;
		params.shutdown = false;

		/* Setup for a standard NEC protocol */
		params.carrier_freq = 37917; /* Hz, 455 kHz/12 for NEC */
		params.carrier_range_lower = 33000; /* Hz */
		params.carrier_range_upper = 43000; /* Hz */
		params.duty_cycle = 33; /* percent, 33 percent for NEC */

		/*
		 * NEC max pulse width: (64/3)/(455 kHz/12) * 16 nec_units
		 * (64/3)/(455 kHz/12) * 16 nec_units * 1.375 = 12378022 ns
		 */
		params.max_pulse_width = 12378022; /* ns */

		/*
		 * NEC noise filter min width: (64/3)/(455 kHz/12) * 1 nec_unit
		 * (64/3)/(455 kHz/12) * 1 nec_units * 0.625 = 351648 ns
		 */
		params.noise_filter_min_width = 351648; /* ns */

		params.modulation = false;
		params.invert_level = true;
		break;
	}
	v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
	return 0;
}

static int cx23885_input_ir_open(struct rc_dev *rc)
{
	struct cx23885_kernel_ir *kernel_ir = rc->priv;

	if (kernel_ir->cx == NULL)
		return -ENODEV;

	return cx23885_input_ir_start(kernel_ir->cx);
}

static void cx23885_input_ir_stop(struct cx23885_dev *dev)
{
	struct v4l2_subdev_ir_parameters params;

	if (dev->sd_ir == NULL)
		return;

	/*
	 * Stop the sd_ir subdevice from generating notifications and
	 * scheduling work.
	 * It is shutdown this way in order to mitigate a race with
	 * cx23885_input_rx_work_handler() in the overrun case, which could
	 * re-enable the subdevice.
	 */
	atomic_set(&dev->ir_input_stopping, 1);
	v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
	while (params.shutdown == false) {
		params.enable = false;
		params.interrupt_enable = false;
		params.shutdown = true;
		v4l2_subdev_call(dev->sd_ir, ir, rx_s_parameters, &params);
		v4l2_subdev_call(dev->sd_ir, ir, rx_g_parameters, &params);
	}
}

static void cx23885_input_ir_close(struct rc_dev *rc)
{
	struct cx23885_kernel_ir *kernel_ir = rc->priv;

	if (kernel_ir->cx != NULL)
		cx23885_input_ir_stop(kernel_ir->cx);
}

int cx23885_input_init(struct cx23885_dev *dev)
{
	struct cx23885_kernel_ir *kernel_ir;
	struct rc_dev *rc;
	char *rc_map;
	enum rc_driver_type driver_type;
	unsigned long allowed_protos;

	int ret;

	/*
	 * If the IR device (hardware registers, chip, GPIO lines, etc.) isn't
	 * encapsulated in a v4l2_subdev, then I'm not going to deal with it.
	 */
	if (dev->sd_ir == NULL)
		return -ENODEV;

	switch (dev->board) {
	case CX23885_BOARD_HAUPPAUGE_HVR1850:
	case CX23885_BOARD_HAUPPAUGE_HVR1290:
	case CX23885_BOARD_HAUPPAUGE_HVR1250:
		/* Integrated CX2388[58] IR controller */
		driver_type = RC_DRIVER_IR_RAW;
		allowed_protos = RC_TYPE_ALL;
		/* The grey Hauppauge RC-5 remote */
		rc_map = RC_MAP_RC5_HAUPPAUGE_NEW;
		break;
	case CX23885_BOARD_TEVII_S470:
		/* Integrated CX23885 IR controller */
		driver_type = RC_DRIVER_IR_RAW;
		allowed_protos = RC_TYPE_ALL;
		/* A guess at the remote */
		rc_map = RC_MAP_TEVII_NEC;
		break;
	default:
		return -ENODEV;
	}

	/* cx23885 board instance kernel IR state */
	kernel_ir = kzalloc(sizeof(struct cx23885_kernel_ir), GFP_KERNEL);
	if (kernel_ir == NULL)
		return -ENOMEM;

	kernel_ir->cx = dev;
	kernel_ir->name = kasprintf(GFP_KERNEL, "cx23885 IR (%s)",
				    cx23885_boards[dev->board].name);
	kernel_ir->phys = kasprintf(GFP_KERNEL, "pci-%s/ir0",
				    pci_name(dev->pci));

	/* input device */
	rc = rc_allocate_device();
	if (!rc) {
		ret = -ENOMEM;
		goto err_out_free;
	}

	kernel_ir->rc = rc;
	rc->input_name = kernel_ir->name;
	rc->input_phys = kernel_ir->phys;
	rc->input_id.bustype = BUS_PCI;
	rc->input_id.version = 1;
	if (dev->pci->subsystem_vendor) {
		rc->input_id.vendor  = dev->pci->subsystem_vendor;
		rc->input_id.product = dev->pci->subsystem_device;
	} else {
		rc->input_id.vendor  = dev->pci->vendor;
		rc->input_id.product = dev->pci->device;
	}
	rc->dev.parent = &dev->pci->dev;
	rc->driver_type = driver_type;
	rc->allowed_protos = allowed_protos;
	rc->priv = kernel_ir;
	rc->open = cx23885_input_ir_open;
	rc->close = cx23885_input_ir_close;
	rc->map_name = rc_map;
	rc->driver_name = MODULE_NAME;

	/* Go */
	dev->kernel_ir = kernel_ir;
	ret = rc_register_device(rc);
	if (ret)
		goto err_out_stop;

	return 0;

err_out_stop:
	cx23885_input_ir_stop(dev);
	dev->kernel_ir = NULL;
	rc_free_device(rc);
err_out_free:
	kfree(kernel_ir->phys);
	kfree(kernel_ir->name);
	kfree(kernel_ir);
	return ret;
}

void cx23885_input_fini(struct cx23885_dev *dev)
{
	/* Always stop the IR hardware from generating interrupts */
	cx23885_input_ir_stop(dev);

	if (dev->kernel_ir == NULL)
		return;
	rc_unregister_device(dev->kernel_ir->rc);
	kfree(dev->kernel_ir->phys);
	kfree(dev->kernel_ir->name);
	kfree(dev->kernel_ir);
	dev->kernel_ir = NULL;
}