[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / media / video / bt856.c

/* 
 * bt856 - BT856A Digital Video Encoder (Rockwell Part)
 *
 * Copyright (C) 1999 Mike Bernson <mike@mlb.org>
 * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
 *
 * Modifications for LML33/DC10plus unified driver
 * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
 *
 * This code was modify/ported from the saa7111 driver written
 * by Dave Perks.
 *
 * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
 *   - moved over to linux>=2.4.x i2c protocol (9/9/2002)
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/pci.h>
#include <linux/signal.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <linux/sched.h>
#include <asm/segment.h>
#include <linux/types.h>

#include <linux/videodev.h>
#include <asm/uaccess.h>

MODULE_DESCRIPTION("Brooktree-856A video encoder driver");
MODULE_AUTHOR("Mike Bernson & Dave Perks");
MODULE_LICENSE("GPL");

#include <linux/i2c.h>
#include <linux/i2c-dev.h>

#define I2C_NAME(s) (s)->name

#include <linux/video_encoder.h>

static int debug = 0;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "Debug level (0-1)");

#define dprintk(num, format, args...) \
	do { \
		if (debug >= num) \
			printk(format, ##args); \
	} while (0)

/* ----------------------------------------------------------------------- */

#define REG_OFFSET  0xCE

struct bt856 {
	unsigned char reg[32];

	int norm;
	int enable;
	int bright;
	int contrast;
	int hue;
	int sat;
};

#define   I2C_BT856        0x88

/* ----------------------------------------------------------------------- */

static inline int
bt856_write (struct i2c_client *client,
	     u8                 reg,
	     u8                 value)
{
	struct bt856 *encoder = i2c_get_clientdata(client);

	encoder->reg[reg - REG_OFFSET] = value;
	return i2c_smbus_write_byte_data(client, reg, value);
}

static inline int
bt856_setbit (struct i2c_client *client,
	      u8                 reg,
	      u8                 bit,
	      u8                 value)
{
	struct bt856 *encoder = i2c_get_clientdata(client);

	return bt856_write(client, reg,
			   (encoder->
			    reg[reg - REG_OFFSET] & ~(1 << bit)) |
			    (value ? (1 << bit) : 0));
}

static void
bt856_dump (struct i2c_client *client)
{
	int i;
	struct bt856 *encoder = i2c_get_clientdata(client);

	printk(KERN_INFO "%s: register dump:", I2C_NAME(client));
	for (i = 0xd6; i <= 0xde; i += 2)
		printk(" %02x", encoder->reg[i - REG_OFFSET]);
	printk("\n");
}

/* ----------------------------------------------------------------------- */

static int
bt856_command (struct i2c_client *client,
	       unsigned int       cmd,
	       void              *arg)
{
	struct bt856 *encoder = i2c_get_clientdata(client);

	switch (cmd) {

	case 0:
		/* This is just for testing!!! */
		dprintk(1, KERN_INFO "bt856: init\n");
		bt856_write(client, 0xdc, 0x18);
		bt856_write(client, 0xda, 0);
		bt856_write(client, 0xde, 0);

		bt856_setbit(client, 0xdc, 3, 1);
		//bt856_setbit(client, 0xdc, 6, 0);
		bt856_setbit(client, 0xdc, 4, 1);

		switch (encoder->norm) {

		case VIDEO_MODE_NTSC:
			bt856_setbit(client, 0xdc, 2, 0);
			break;

		case VIDEO_MODE_PAL:
			bt856_setbit(client, 0xdc, 2, 1);
			break;
		}

		bt856_setbit(client, 0xdc, 1, 1);
		bt856_setbit(client, 0xde, 4, 0);
		bt856_setbit(client, 0xde, 3, 1);
		if (debug != 0)
			bt856_dump(client);
		break;

	case ENCODER_GET_CAPABILITIES:
	{
		struct video_encoder_capability *cap = arg;

		dprintk(1, KERN_INFO "%s: get capabilities\n",
			I2C_NAME(client));

		cap->flags = VIDEO_ENCODER_PAL |
			     VIDEO_ENCODER_NTSC |
			     VIDEO_ENCODER_CCIR;
		cap->inputs = 2;
		cap->outputs = 1;
	}
		break;

	case ENCODER_SET_NORM:
	{
		int *iarg = arg;

		dprintk(1, KERN_INFO "%s: set norm %d\n", I2C_NAME(client),
			*iarg);

		switch (*iarg) {

		case VIDEO_MODE_NTSC:
			bt856_setbit(client, 0xdc, 2, 0);
			break;

		case VIDEO_MODE_PAL:
			bt856_setbit(client, 0xdc, 2, 1);
			bt856_setbit(client, 0xda, 0, 0);
			//bt856_setbit(client, 0xda, 0, 1);
			break;

		default:
			return -EINVAL;

		}
		encoder->norm = *iarg;
		if (debug != 0)
			bt856_dump(client);
	}
		break;

	case ENCODER_SET_INPUT:
	{
		int *iarg = arg;

		dprintk(1, KERN_INFO "%s: set input %d\n", I2C_NAME(client),
			*iarg);

		/* We only have video bus.
		 * iarg = 0: input is from bt819
		 * iarg = 1: input is from ZR36060 */

		switch (*iarg) {

		case 0:
			bt856_setbit(client, 0xde, 4, 0);
			bt856_setbit(client, 0xde, 3, 1);
			bt856_setbit(client, 0xdc, 3, 1);
			bt856_setbit(client, 0xdc, 6, 0);
			break;
		case 1:
			bt856_setbit(client, 0xde, 4, 0);
			bt856_setbit(client, 0xde, 3, 1);
			bt856_setbit(client, 0xdc, 3, 1);
			bt856_setbit(client, 0xdc, 6, 1);
			break;
		case 2:	// Color bar
			bt856_setbit(client, 0xdc, 3, 0);
			bt856_setbit(client, 0xde, 4, 1);
			break;
		default:
			return -EINVAL;

		}

		if (debug != 0)
			bt856_dump(client);
	}
		break;

	case ENCODER_SET_OUTPUT:
	{
		int *iarg = arg;

		dprintk(1, KERN_INFO "%s: set output %d\n", I2C_NAME(client),
			*iarg);

		/* not much choice of outputs */
		if (*iarg != 0) {
			return -EINVAL;
		}
	}
		break;

	case ENCODER_ENABLE_OUTPUT:
	{
		int *iarg = arg;

		encoder->enable = !!*iarg;

		dprintk(1, KERN_INFO "%s: enable output %d\n",
			I2C_NAME(client), encoder->enable);
	}
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

/* ----------------------------------------------------------------------- */

/*
 * Generic i2c probe
 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 */
static unsigned short normal_i2c[] = { I2C_BT856 >> 1, I2C_CLIENT_END };
static unsigned short normal_i2c_range[] = { I2C_CLIENT_END };

static unsigned short probe[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short probe_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short ignore[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short ignore_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
static unsigned short force[2] = { I2C_CLIENT_END , I2C_CLIENT_END };
                                                                                
static struct i2c_client_address_data addr_data = {
	.normal_i2c		= normal_i2c,
	.normal_i2c_range	= normal_i2c_range,
	.probe			= probe,
	.probe_range		= probe_range,
	.ignore			= ignore,
	.ignore_range		= ignore_range,
	.force			= force
};

static struct i2c_driver i2c_driver_bt856;

static int
bt856_detect_client (struct i2c_adapter *adapter,
		     int                 address,
		     int                 kind)
{
	int i;
	struct i2c_client *client;
	struct bt856 *encoder;

	dprintk(1,
		KERN_INFO
		"bt856.c: detecting bt856 client on address 0x%x\n",
		address << 1);

	/* Check if the adapter supports the needed features */
	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return 0;

	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
	if (client == 0)
		return -ENOMEM;
	memset(client, 0, sizeof(struct i2c_client));
	client->addr = address;
	client->adapter = adapter;
	client->driver = &i2c_driver_bt856;
	client->flags = I2C_CLIENT_ALLOW_USE;
	strlcpy(I2C_NAME(client), "bt856", sizeof(I2C_NAME(client)));

	encoder = kmalloc(sizeof(struct bt856), GFP_KERNEL);
	if (encoder == NULL) {
		kfree(client);
		return -ENOMEM;
	}
	memset(encoder, 0, sizeof(struct bt856));
	encoder->norm = VIDEO_MODE_NTSC;
	encoder->enable = 1;
	i2c_set_clientdata(client, encoder);

	i = i2c_attach_client(client);
	if (i) {
		kfree(client);
		kfree(encoder);
		return i;
	}

	bt856_write(client, 0xdc, 0x18);
	bt856_write(client, 0xda, 0);
	bt856_write(client, 0xde, 0);

	bt856_setbit(client, 0xdc, 3, 1);
	//bt856_setbit(client, 0xdc, 6, 0);
	bt856_setbit(client, 0xdc, 4, 1);

	switch (encoder->norm) {

	case VIDEO_MODE_NTSC:
		bt856_setbit(client, 0xdc, 2, 0);
		break;

	case VIDEO_MODE_PAL:
		bt856_setbit(client, 0xdc, 2, 1);
		break;
	}

	bt856_setbit(client, 0xdc, 1, 1);
	bt856_setbit(client, 0xde, 4, 0);
	bt856_setbit(client, 0xde, 3, 1);

	if (debug != 0)
		bt856_dump(client);

	dprintk(1, KERN_INFO "%s_attach: at address 0x%x\n", I2C_NAME(client),
		client->addr << 1);

	return 0;
}

static int
bt856_attach_adapter (struct i2c_adapter *adapter)
{
	dprintk(1,
		KERN_INFO
		"bt856.c: starting probe for adapter %s (0x%x)\n",
		I2C_NAME(adapter), adapter->id);
	return i2c_probe(adapter, &addr_data, &bt856_detect_client);
}

static int
bt856_detach_client (struct i2c_client *client)
{
	struct bt856 *encoder = i2c_get_clientdata(client);
	int err;

	err = i2c_detach_client(client);
	if (err) {
		return err;
	}

	kfree(encoder);
	kfree(client);

	return 0;
}

/* ----------------------------------------------------------------------- */

static struct i2c_driver i2c_driver_bt856 = {
	.owner = THIS_MODULE,
	.name = "bt856",

	.id = I2C_DRIVERID_BT856,
	.flags = I2C_DF_NOTIFY,

	.attach_adapter = bt856_attach_adapter,
	.detach_client = bt856_detach_client,
	.command = bt856_command,
};

static int __init
bt856_init (void)
{
	return i2c_add_driver(&i2c_driver_bt856);
}

static void __exit
bt856_exit (void)
{
	i2c_del_driver(&i2c_driver_bt856);
}

module_init(bt856_init);
module_exit(bt856_exit);
Commit	Line	Data
1da177e4 LT	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/pci.h>
	41	#include <linux/signal.h>
	42	#include <asm/io.h>
	43	#include <asm/pgtable.h>
	44	#include <asm/page.h>
	45	#include <linux/sched.h>
	46	#include <asm/segment.h>
	47	#include <linux/types.h>
	48
	49	#include <linux/videodev.h>
	50	#include <asm/uaccess.h>
	51
	52	MODULE_DESCRIPTION("Brooktree-856A video encoder driver");
	53	MODULE_AUTHOR("Mike Bernson & Dave Perks");
	54	MODULE_LICENSE("GPL");
	55
	56	#include <linux/i2c.h>
	57	#include <linux/i2c-dev.h>
	58
	59	#define I2C_NAME(s) (s)->name
	60
	61	#include <linux/video_encoder.h>
	62
	63	static int debug = 0;
	64	module_param(debug, int, 0);
65	MODULE_PARM_DESC(debug, "Debug level (0-1)");
66
67	#define dprintk(num, format, args...) \
68	do { \
69	if (debug >= num) \
70	printk(format, ##args); \
71	} while (0)
72
73	/* ----------------------------------------------------------------------- */
74
75	#define REG_OFFSET 0xCE
76
77	struct bt856 {
78	unsigned char reg[32];
79
80	int norm;
81	int enable;
82	int bright;
83	int contrast;
84	int hue;
85	int sat;
86	};
87
88	#define I2C_BT856 0x88
89
90	/* ----------------------------------------------------------------------- */
91
92	static inline int
93	bt856_write (struct i2c_client *client,
94	u8 reg,
95	u8 value)
96	{
97	struct bt856 *encoder = i2c_get_clientdata(client);
98
99	encoder->reg[reg - REG_OFFSET] = value;
100	return i2c_smbus_write_byte_data(client, reg, value);
101	}
102
103	static inline int
104	bt856_setbit (struct i2c_client *client,
105	u8 reg,
106	u8 bit,
107	u8 value)
108	{
109	struct bt856 *encoder = i2c_get_clientdata(client);
110
111	return bt856_write(client, reg,
112	(encoder->
113	reg[reg - REG_OFFSET] & ~(1 << bit)) \|
114	(value ? (1 << bit) : 0));
115	}
116
117	static void
118	bt856_dump (struct i2c_client *client)
119	{
120	int i;
121	struct bt856 *encoder = i2c_get_clientdata(client);
122
123	printk(KERN_INFO "%s: register dump:", I2C_NAME(client));
124	for (i = 0xd6; i <= 0xde; i += 2)
125	printk(" %02x", encoder->reg[i - REG_OFFSET]);
126	printk("\n");
127	}
128
129	/* ----------------------------------------------------------------------- */
130
131	static int
132	bt856_command (struct i2c_client *client,
133	unsigned int cmd,
134	void *arg)
135	{
136	struct bt856 *encoder = i2c_get_clientdata(client);
137
138	switch (cmd) {
139
140	case 0:
141	/* This is just for testing!!! */
142	dprintk(1, KERN_INFO "bt856: init\n");
143	bt856_write(client, 0xdc, 0x18);
144	bt856_write(client, 0xda, 0);
145	bt856_write(client, 0xde, 0);
146
147	bt856_setbit(client, 0xdc, 3, 1);
148	//bt856_setbit(client, 0xdc, 6, 0);
149	bt856_setbit(client, 0xdc, 4, 1);
150
151	switch (encoder->norm) {
152
153	case VIDEO_MODE_NTSC:
154	bt856_setbit(client, 0xdc, 2, 0);
155	break;
156
157	case VIDEO_MODE_PAL:
158	bt856_setbit(client, 0xdc, 2, 1);
159	break;
160	}
161
162	bt856_setbit(client, 0xdc, 1, 1);
163	bt856_setbit(client, 0xde, 4, 0);
164	bt856_setbit(client, 0xde, 3, 1);
165	if (debug != 0)
166	bt856_dump(client);
167	break;
168
169	case ENCODER_GET_CAPABILITIES:
170	{
171	struct video_encoder_capability *cap = arg;
172
173	dprintk(1, KERN_INFO "%s: get capabilities\n",
174	I2C_NAME(client));
175
176	cap->flags = VIDEO_ENCODER_PAL \|
177	VIDEO_ENCODER_NTSC \|
178	VIDEO_ENCODER_CCIR;
179	cap->inputs = 2;
180	cap->outputs = 1;
181	}
182	break;
183
184	case ENCODER_SET_NORM:
185	{
186	int *iarg = arg;
187
188	dprintk(1, KERN_INFO "%s: set norm %d\n", I2C_NAME(client),
189	*iarg);
190
191	switch (*iarg) {
192
193	case VIDEO_MODE_NTSC:
194	bt856_setbit(client, 0xdc, 2, 0);
195	break;
196
197	case VIDEO_MODE_PAL:
198	bt856_setbit(client, 0xdc, 2, 1);
199	bt856_setbit(client, 0xda, 0, 0);
200	//bt856_setbit(client, 0xda, 0, 1);
201	break;
202
203	default:
204	return -EINVAL;
205
206	}
207	encoder->norm = *iarg;
208	if (debug != 0)
209	bt856_dump(client);
210	}
211	break;
212
213	case ENCODER_SET_INPUT:
214	{
215	int *iarg = arg;
216
217	dprintk(1, KERN_INFO "%s: set input %d\n", I2C_NAME(client),
218	*iarg);
219
220	/* We only have video bus.
221	* iarg = 0: input is from bt819
222	* iarg = 1: input is from ZR36060 */
223
224	switch (*iarg) {
225
226	case 0:
227	bt856_setbit(client, 0xde, 4, 0);
228	bt856_setbit(client, 0xde, 3, 1);
229	bt856_setbit(client, 0xdc, 3, 1);
230	bt856_setbit(client, 0xdc, 6, 0);
231	break;
232	case 1:
233	bt856_setbit(client, 0xde, 4, 0);
234	bt856_setbit(client, 0xde, 3, 1);
235	bt856_setbit(client, 0xdc, 3, 1);
236	bt856_setbit(client, 0xdc, 6, 1);
237	break;
238	case 2: // Color bar
239	bt856_setbit(client, 0xdc, 3, 0);
240	bt856_setbit(client, 0xde, 4, 1);
241	break;
242	default:
243	return -EINVAL;
244
245	}
246
247	if (debug != 0)
248	bt856_dump(client);
249	}
250	break;
251
252	case ENCODER_SET_OUTPUT:
253	{
254	int *iarg = arg;
255
256	dprintk(1, KERN_INFO "%s: set output %d\n", I2C_NAME(client),
257	*iarg);
258
259	/* not much choice of outputs */
260	if (*iarg != 0) {
261	return -EINVAL;
262	}
263	}
264	break;
265
266	case ENCODER_ENABLE_OUTPUT:
267	{
268	int *iarg = arg;
269
270	encoder->enable = !!*iarg;
271
272	dprintk(1, KERN_INFO "%s: enable output %d\n",
273	I2C_NAME(client), encoder->enable);
274	}
275	break;
276
277	default:
278	return -EINVAL;
279	}
280
281	return 0;
282	}
283
284	/* ----------------------------------------------------------------------- */
285
286	/*
287	* Generic i2c probe
288	* concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
289	*/
290	static unsigned short normal_i2c[] = { I2C_BT856 >> 1, I2C_CLIENT_END };
291	static unsigned short normal_i2c_range[] = { I2C_CLIENT_END };
292
293	static unsigned short probe[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
294	static unsigned short probe_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
295	static unsigned short ignore[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
296	static unsigned short ignore_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
297	static unsigned short force[2] = { I2C_CLIENT_END , I2C_CLIENT_END };
298
299	static struct i2c_client_address_data addr_data = {
300	.normal_i2c = normal_i2c,
301	.normal_i2c_range = normal_i2c_range,
302	.probe = probe,
303	.probe_range = probe_range,
304	.ignore = ignore,
305	.ignore_range = ignore_range,
306	.force = force
307	};
308
309	static struct i2c_driver i2c_driver_bt856;
310
311	static int
312	bt856_detect_client (struct i2c_adapter *adapter,
313	int address,
314	int kind)
315	{
316	int i;
317	struct i2c_client *client;
318	struct bt856 *encoder;
319
320	dprintk(1,
321	KERN_INFO
322	"bt856.c: detecting bt856 client on address 0x%x\n",
323	address << 1);
324
325	/* Check if the adapter supports the needed features */
326	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
327	return 0;
328
329	client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
330	if (client == 0)
331	return -ENOMEM;
332	memset(client, 0, sizeof(struct i2c_client));
333	client->addr = address;
334	client->adapter = adapter;
335	client->driver = &i2c_driver_bt856;
336	client->flags = I2C_CLIENT_ALLOW_USE;
337	strlcpy(I2C_NAME(client), "bt856", sizeof(I2C_NAME(client)));
338
339	encoder = kmalloc(sizeof(struct bt856), GFP_KERNEL);
340	if (encoder == NULL) {
341	kfree(client);
342	return -ENOMEM;
343	}
344	memset(encoder, 0, sizeof(struct bt856));
345	encoder->norm = VIDEO_MODE_NTSC;
346	encoder->enable = 1;
347	i2c_set_clientdata(client, encoder);
348
349	i = i2c_attach_client(client);
350	if (i) {
351	kfree(client);
352	kfree(encoder);
353	return i;
354	}
355
356	bt856_write(client, 0xdc, 0x18);
357	bt856_write(client, 0xda, 0);
358	bt856_write(client, 0xde, 0);
359
360	bt856_setbit(client, 0xdc, 3, 1);
361	//bt856_setbit(client, 0xdc, 6, 0);
362	bt856_setbit(client, 0xdc, 4, 1);
363
364	switch (encoder->norm) {
365
366	case VIDEO_MODE_NTSC:
367	bt856_setbit(client, 0xdc, 2, 0);
368	break;
369
370	case VIDEO_MODE_PAL:
371	bt856_setbit(client, 0xdc, 2, 1);
372	break;
373	}
374
375	bt856_setbit(client, 0xdc, 1, 1);
376	bt856_setbit(client, 0xde, 4, 0);
377	bt856_setbit(client, 0xde, 3, 1);
378
379	if (debug != 0)
380	bt856_dump(client);
381
382	dprintk(1, KERN_INFO "%s_attach: at address 0x%x\n", I2C_NAME(client),
383	client->addr << 1);
384
385	return 0;
386	}
387
388	static int
389	bt856_attach_adapter (struct i2c_adapter *adapter)
390	{
391	dprintk(1,
392	KERN_INFO
393	"bt856.c: starting probe for adapter %s (0x%x)\n",
394	I2C_NAME(adapter), adapter->id);
395	return i2c_probe(adapter, &addr_data, &bt856_detect_client);
396	}
397
398	static int
399	bt856_detach_client (struct i2c_client *client)
400	{
401	struct bt856 *encoder = i2c_get_clientdata(client);
402	int err;
403
404	err = i2c_detach_client(client);
405	if (err) {
406	return err;
407	}
408
409	kfree(encoder);
410	kfree(client);
411
412	return 0;
413	}
414
415	/* ----------------------------------------------------------------------- */
416
417	static struct i2c_driver i2c_driver_bt856 = {
418	.owner = THIS_MODULE,
419	.name = "bt856",
420
421	.id = I2C_DRIVERID_BT856,
422	.flags = I2C_DF_NOTIFY,
423
424	.attach_adapter = bt856_attach_adapter,
425	.detach_client = bt856_detach_client,
426	.command = bt856_command,
427	};
428
429	static int __init
430	bt856_init (void)
431	{
432	return i2c_add_driver(&i2c_driver_bt856);
433	}
434
435	static void __exit
436	bt856_exit (void)
437	{
438	i2c_del_driver(&i2c_driver_bt856);
439	}
440
441	module_init(bt856_init);
442	module_exit(bt856_exit);