1/*
2 * bt856 - BT856A Digital Video Encoder (Rockwell Part)
3 *
4 * Copyright (C) 1999 Mike Bernson <mike@mlb.org>
5 * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
6 *
7 * Modifications for LML33/DC10plus unified driver
8 * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
9 *
10 * This code was modify/ported from the saa7111 driver written
11 * by Dave Perks.
12 *
13 * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
14 *   - moved over to linux>=2.4.x i2c protocol (9/9/2002)
15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 */
30
31#include <linux/module.h>
32#include <linux/init.h>
33#include <linux/delay.h>
34#include <linux/errno.h>
35#include <linux/fs.h>
36#include <linux/kernel.h>
37#include <linux/major.h>
38#include <linux/slab.h>
39#include <linux/mm.h>
40#include <linux/signal.h>
41#include <asm/io.h>
42#include <asm/pgtable.h>
43#include <asm/page.h>
44#include <linux/types.h>
45
46#include <linux/videodev.h>
47#include <asm/uaccess.h>
48
49MODULE_DESCRIPTION("Brooktree-856A video encoder driver");
50MODULE_AUTHOR("Mike Bernson & Dave Perks");
51MODULE_LICENSE("GPL");
52
53#include <linux/i2c.h>
54
55#define I2C_NAME(s) (s)->name
56
57#include <linux/video_encoder.h>
58
59static int debug = 0;
60module_param(debug, int, 0);
61MODULE_PARM_DESC(debug, "Debug level (0-1)");
62
63#define dprintk(num, format, args...) \
64	do { \
65		if (debug >= num) \
66			printk(format, ##args); \
67	} while (0)
68
69/* ----------------------------------------------------------------------- */
70
71#define REG_OFFSET	0xDA
72#define BT856_NR_REG	6
73
74struct bt856 {
75	unsigned char reg[BT856_NR_REG];
76
77	int norm;
78	int enable;
79};
80
81#define   I2C_BT856        0x88
82
83/* ----------------------------------------------------------------------- */
84
85static inline int
86bt856_write (struct i2c_client *client,
87	     u8                 reg,
88	     u8                 value)
89{
90	struct bt856 *encoder = i2c_get_clientdata(client);
91
92	encoder->reg[reg - REG_OFFSET] = value;
93	return i2c_smbus_write_byte_data(client, reg, value);
94}
95
96static inline int
97bt856_setbit (struct i2c_client *client,
98	      u8                 reg,
99	      u8                 bit,
100	      u8                 value)
101{
102	struct bt856 *encoder = i2c_get_clientdata(client);
103
104	return bt856_write(client, reg,
105			   (encoder->
106			    reg[reg - REG_OFFSET] & ~(1 << bit)) |
107			    (value ? (1 << bit) : 0));
108}
109
110static void
111bt856_dump (struct i2c_client *client)
112{
113	int i;
114	struct bt856 *encoder = i2c_get_clientdata(client);
115
116	printk(KERN_INFO "%s: register dump:", I2C_NAME(client));
117	for (i = 0; i < BT856_NR_REG; i += 2)
118		printk(" %02x", encoder->reg[i]);
119	printk("\n");
120}
121
122/* ----------------------------------------------------------------------- */
123
124static int
125bt856_command (struct i2c_client *client,
126	       unsigned int       cmd,
127	       void              *arg)
128{
129	struct bt856 *encoder = i2c_get_clientdata(client);
130
131	switch (cmd) {
132
133	case 0:
134		/* This is just for testing!!! */
135		dprintk(1, KERN_INFO "bt856: init\n");
136		bt856_write(client, 0xdc, 0x18);
137		bt856_write(client, 0xda, 0);
138		bt856_write(client, 0xde, 0);
139
140		bt856_setbit(client, 0xdc, 3, 1);
141		//bt856_setbit(client, 0xdc, 6, 0);
142		bt856_setbit(client, 0xdc, 4, 1);
143
144		switch (encoder->norm) {
145
146		case VIDEO_MODE_NTSC:
147			bt856_setbit(client, 0xdc, 2, 0);
148			break;
149
150		case VIDEO_MODE_PAL:
151			bt856_setbit(client, 0xdc, 2, 1);
152			break;
153		}
154
155		bt856_setbit(client, 0xdc, 1, 1);
156		bt856_setbit(client, 0xde, 4, 0);
157		bt856_setbit(client, 0xde, 3, 1);
158		if (debug != 0)
159			bt856_dump(client);
160		break;
161
162	case ENCODER_GET_CAPABILITIES:
163	{
164		struct video_encoder_capability *cap = arg;
165
166		dprintk(1, KERN_INFO "%s: get capabilities\n",
167			I2C_NAME(client));
168
169		cap->flags = VIDEO_ENCODER_PAL |
170			     VIDEO_ENCODER_NTSC |
171			     VIDEO_ENCODER_CCIR;
172		cap->inputs = 2;
173		cap->outputs = 1;
174	}
175		break;
176
177	case ENCODER_SET_NORM:
178	{
179		int *iarg = arg;
180
181		dprintk(1, KERN_INFO "%s: set norm %d\n", I2C_NAME(client),
182			*iarg);
183
184		switch (*iarg) {
185
186		case VIDEO_MODE_NTSC:
187			bt856_setbit(client, 0xdc, 2, 0);
188			break;
189
190		case VIDEO_MODE_PAL:
191			bt856_setbit(client, 0xdc, 2, 1);
192			bt856_setbit(client, 0xda, 0, 0);
193			//bt856_setbit(client, 0xda, 0, 1);
194			break;
195
196		default:
197			return -EINVAL;
198
199		}
200		encoder->norm = *iarg;
201		if (debug != 0)
202			bt856_dump(client);
203	}
204		break;
205
206	case ENCODER_SET_INPUT:
207	{
208		int *iarg = arg;
209
210		dprintk(1, KERN_INFO "%s: set input %d\n", I2C_NAME(client),
211			*iarg);
212
213		/* We only have video bus.
214		 * iarg = 0: input is from bt819
215		 * iarg = 1: input is from ZR36060 */
216
217		switch (*iarg) {
218
219		case 0:
220			bt856_setbit(client, 0xde, 4, 0);
221			bt856_setbit(client, 0xde, 3, 1);
222			bt856_setbit(client, 0xdc, 3, 1);
223			bt856_setbit(client, 0xdc, 6, 0);
224			break;
225		case 1:
226			bt856_setbit(client, 0xde, 4, 0);
227			bt856_setbit(client, 0xde, 3, 1);
228			bt856_setbit(client, 0xdc, 3, 1);
229			bt856_setbit(client, 0xdc, 6, 1);
230			break;
231		case 2:	// Color bar
232			bt856_setbit(client, 0xdc, 3, 0);
233			bt856_setbit(client, 0xde, 4, 1);
234			break;
235		default:
236			return -EINVAL;
237
238		}
239
240		if (debug != 0)
241			bt856_dump(client);
242	}
243		break;
244
245	case ENCODER_SET_OUTPUT:
246	{
247		int *iarg = arg;
248
249		dprintk(1, KERN_INFO "%s: set output %d\n", I2C_NAME(client),
250			*iarg);
251
252		/* not much choice of outputs */
253		if (*iarg != 0) {
254			return -EINVAL;
255		}
256	}
257		break;
258
259	case ENCODER_ENABLE_OUTPUT:
260	{
261		int *iarg = arg;
262
263		encoder->enable = !!*iarg;
264
265		dprintk(1, KERN_INFO "%s: enable output %d\n",
266			I2C_NAME(client), encoder->enable);
267	}
268		break;
269
270	default:
271		return -EINVAL;
272	}
273
274	return 0;
275}
276
277/* ----------------------------------------------------------------------- */
278
279/*
280 * Generic i2c probe
281 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
282 */
283static unsigned short normal_i2c[] = { I2C_BT856 >> 1, I2C_CLIENT_END };
284
285static unsigned short ignore = I2C_CLIENT_END;
286
287static struct i2c_client_address_data addr_data = {
288	.normal_i2c		= normal_i2c,
289	.probe			= &ignore,
290	.ignore			= &ignore,
291};
292
293static struct i2c_driver i2c_driver_bt856;
294
295static int
296bt856_detect_client (struct i2c_adapter *adapter,
297		     int                 address,
298		     int                 kind)
299{
300	int i;
301	struct i2c_client *client;
302	struct bt856 *encoder;
303
304	dprintk(1,
305		KERN_INFO
306		"bt856.c: detecting bt856 client on address 0x%x\n",
307		address << 1);
308
309	/* Check if the adapter supports the needed features */
310	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
311		return 0;
312
313	client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
314	if (client == 0)
315		return -ENOMEM;
316	client->addr = address;
317	client->adapter = adapter;
318	client->driver = &i2c_driver_bt856;
319	strlcpy(I2C_NAME(client), "bt856", sizeof(I2C_NAME(client)));
320
321	encoder = kzalloc(sizeof(struct bt856), GFP_KERNEL);
322	if (encoder == NULL) {
323		kfree(client);
324		return -ENOMEM;
325	}
326	encoder->norm = VIDEO_MODE_NTSC;
327	encoder->enable = 1;
328	i2c_set_clientdata(client, encoder);
329
330	i = i2c_attach_client(client);
331	if (i) {
332		kfree(client);
333		kfree(encoder);
334		return i;
335	}
336
337	bt856_write(client, 0xdc, 0x18);
338	bt856_write(client, 0xda, 0);
339	bt856_write(client, 0xde, 0);
340
341	bt856_setbit(client, 0xdc, 3, 1);
342	//bt856_setbit(client, 0xdc, 6, 0);
343	bt856_setbit(client, 0xdc, 4, 1);
344
345	switch (encoder->norm) {
346
347	case VIDEO_MODE_NTSC:
348		bt856_setbit(client, 0xdc, 2, 0);
349		break;
350
351	case VIDEO_MODE_PAL:
352		bt856_setbit(client, 0xdc, 2, 1);
353		break;
354	}
355
356	bt856_setbit(client, 0xdc, 1, 1);
357	bt856_setbit(client, 0xde, 4, 0);
358	bt856_setbit(client, 0xde, 3, 1);
359
360	if (debug != 0)
361		bt856_dump(client);
362
363	dprintk(1, KERN_INFO "%s_attach: at address 0x%x\n", I2C_NAME(client),
364		client->addr << 1);
365
366	return 0;
367}
368
369static int
370bt856_attach_adapter (struct i2c_adapter *adapter)
371{
372	dprintk(1,
373		KERN_INFO
374		"bt856.c: starting probe for adapter %s (0x%x)\n",
375		I2C_NAME(adapter), adapter->id);
376	return i2c_probe(adapter, &addr_data, &bt856_detect_client);
377}
378
379static int
380bt856_detach_client (struct i2c_client *client)
381{
382	struct bt856 *encoder = i2c_get_clientdata(client);
383	int err;
384
385	err = i2c_detach_client(client);
386	if (err) {
387		return err;
388	}
389
390	kfree(encoder);
391	kfree(client);
392
393	return 0;
394}
395
396/* ----------------------------------------------------------------------- */
397
398static struct i2c_driver i2c_driver_bt856 = {
399	.driver = {
400		.name = "bt856",
401	},
402
403	.id = I2C_DRIVERID_BT856,
404
405	.attach_adapter = bt856_attach_adapter,
406	.detach_client = bt856_detach_client,
407	.command = bt856_command,
408};
409
410static int __init
411bt856_init (void)
412{
413	return i2c_add_driver(&i2c_driver_bt856);
414}
415
416static void __exit
417bt856_exit (void)
418{
419	i2c_del_driver(&i2c_driver_bt856);
420}
421
422module_init(bt856_init);
423module_exit(bt856_exit);
424