2 * bt856 - BT856A Digital Video Encoder (Rockwell Part)
4 * Copyright (C) 1999 Mike Bernson <mike@mlb.org>
5 * Copyright (C) 1998 Dave Perks <dperks@ibm.net>
7 * Modifications for LML33/DC10plus unified driver
8 * Copyright (C) 2000 Serguei Miridonov <mirsev@cicese.mx>
10 * This code was modify/ported from the saa7111 driver written
13 * Changes by Ronald Bultje <rbultje@ronald.bitfreak.net>
14 * - moved over to linux>=2.4.x i2c protocol (9/9/2002)
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.
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.
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.
31 #include <linux/module.h>
32 #include <linux/types.h>
33 #include <linux/ioctl.h>
34 #include <asm/uaccess.h>
35 #include <linux/i2c.h>
36 #include <linux/i2c-id.h>
37 #include <linux/videodev2.h>
38 #include <media/v4l2-device.h>
39 #include <media/v4l2-chip-ident.h>
40 #include <media/v4l2-i2c-drv-legacy.h>
42 MODULE_DESCRIPTION("Brooktree-856A video encoder driver");
43 MODULE_AUTHOR("Mike Bernson & Dave Perks");
44 MODULE_LICENSE("GPL");
47 module_param(debug, int, 0);
48 MODULE_PARM_DESC(debug, "Debug level (0-1)");
50 static unsigned short normal_i2c[] = { 0x88 >> 1, I2C_CLIENT_END };
54 /* ----------------------------------------------------------------------- */
56 #define BT856_REG_OFFSET 0xDA
57 #define BT856_NR_REG 6
60 struct v4l2_subdev sd;
61 unsigned char reg[BT856_NR_REG];
66 static inline struct bt856 *to_bt856(struct v4l2_subdev *sd)
68 return container_of(sd, struct bt856, sd);
71 /* ----------------------------------------------------------------------- */
73 static inline int bt856_write(struct bt856 *encoder, u8 reg, u8 value)
75 struct i2c_client *client = v4l2_get_subdevdata(&encoder->sd);
77 encoder->reg[reg - BT856_REG_OFFSET] = value;
78 return i2c_smbus_write_byte_data(client, reg, value);
81 static inline int bt856_setbit(struct bt856 *encoder, u8 reg, u8 bit, u8 value)
83 return bt856_write(encoder, reg,
84 (encoder->reg[reg - BT856_REG_OFFSET] & ~(1 << bit)) |
85 (value ? (1 << bit) : 0));
88 static void bt856_dump(struct bt856 *encoder)
92 v4l2_info(&encoder->sd, "register dump:\n");
93 for (i = 0; i < BT856_NR_REG; i += 2)
94 printk(KERN_CONT " %02x", encoder->reg[i]);
95 printk(KERN_CONT "\n");
98 /* ----------------------------------------------------------------------- */
100 static int bt856_init(struct v4l2_subdev *sd, u32 arg)
102 struct bt856 *encoder = to_bt856(sd);
104 /* This is just for testing!!! */
105 v4l2_dbg(1, debug, sd, "init\n");
106 bt856_write(encoder, 0xdc, 0x18);
107 bt856_write(encoder, 0xda, 0);
108 bt856_write(encoder, 0xde, 0);
110 bt856_setbit(encoder, 0xdc, 3, 1);
111 /*bt856_setbit(encoder, 0xdc, 6, 0);*/
112 bt856_setbit(encoder, 0xdc, 4, 1);
114 if (encoder->norm & V4L2_STD_NTSC)
115 bt856_setbit(encoder, 0xdc, 2, 0);
117 bt856_setbit(encoder, 0xdc, 2, 1);
119 bt856_setbit(encoder, 0xdc, 1, 1);
120 bt856_setbit(encoder, 0xde, 4, 0);
121 bt856_setbit(encoder, 0xde, 3, 1);
127 static int bt856_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
129 struct bt856 *encoder = to_bt856(sd);
131 v4l2_dbg(1, debug, sd, "set norm %llx\n", std);
133 if (std & V4L2_STD_NTSC) {
134 bt856_setbit(encoder, 0xdc, 2, 0);
135 } else if (std & V4L2_STD_PAL) {
136 bt856_setbit(encoder, 0xdc, 2, 1);
137 bt856_setbit(encoder, 0xda, 0, 0);
138 /*bt856_setbit(encoder, 0xda, 0, 1);*/
148 static int bt856_s_routing(struct v4l2_subdev *sd, const struct v4l2_routing *route)
150 struct bt856 *encoder = to_bt856(sd);
152 v4l2_dbg(1, debug, sd, "set input %d\n", route->input);
154 /* We only have video bus.
155 * route->input= 0: input is from bt819
156 * route->input= 1: input is from ZR36060 */
157 switch (route->input) {
159 bt856_setbit(encoder, 0xde, 4, 0);
160 bt856_setbit(encoder, 0xde, 3, 1);
161 bt856_setbit(encoder, 0xdc, 3, 1);
162 bt856_setbit(encoder, 0xdc, 6, 0);
165 bt856_setbit(encoder, 0xde, 4, 0);
166 bt856_setbit(encoder, 0xde, 3, 1);
167 bt856_setbit(encoder, 0xdc, 3, 1);
168 bt856_setbit(encoder, 0xdc, 6, 1);
170 case 2: /* Color bar */
171 bt856_setbit(encoder, 0xdc, 3, 0);
172 bt856_setbit(encoder, 0xde, 4, 1);
183 static int bt856_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
185 struct i2c_client *client = v4l2_get_subdevdata(sd);
187 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_BT856, 0);
190 static int bt856_command(struct i2c_client *client, unsigned cmd, void *arg)
192 return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
195 /* ----------------------------------------------------------------------- */
197 static const struct v4l2_subdev_core_ops bt856_core_ops = {
198 .g_chip_ident = bt856_g_chip_ident,
202 static const struct v4l2_subdev_video_ops bt856_video_ops = {
203 .s_std_output = bt856_s_std_output,
204 .s_routing = bt856_s_routing,
207 static const struct v4l2_subdev_ops bt856_ops = {
208 .core = &bt856_core_ops,
209 .video = &bt856_video_ops,
212 /* ----------------------------------------------------------------------- */
214 static int bt856_probe(struct i2c_client *client,
215 const struct i2c_device_id *id)
217 struct bt856 *encoder;
218 struct v4l2_subdev *sd;
220 /* Check if the adapter supports the needed features */
221 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
224 v4l_info(client, "chip found @ 0x%x (%s)\n",
225 client->addr << 1, client->adapter->name);
227 encoder = kzalloc(sizeof(struct bt856), GFP_KERNEL);
231 v4l2_i2c_subdev_init(sd, client, &bt856_ops);
232 encoder->norm = V4L2_STD_NTSC;
234 bt856_write(encoder, 0xdc, 0x18);
235 bt856_write(encoder, 0xda, 0);
236 bt856_write(encoder, 0xde, 0);
238 bt856_setbit(encoder, 0xdc, 3, 1);
239 /*bt856_setbit(encoder, 0xdc, 6, 0);*/
240 bt856_setbit(encoder, 0xdc, 4, 1);
242 if (encoder->norm & V4L2_STD_NTSC)
243 bt856_setbit(encoder, 0xdc, 2, 0);
245 bt856_setbit(encoder, 0xdc, 2, 1);
247 bt856_setbit(encoder, 0xdc, 1, 1);
248 bt856_setbit(encoder, 0xde, 4, 0);
249 bt856_setbit(encoder, 0xde, 3, 1);
256 static int bt856_remove(struct i2c_client *client)
258 struct v4l2_subdev *sd = i2c_get_clientdata(client);
260 v4l2_device_unregister_subdev(sd);
265 static const struct i2c_device_id bt856_id[] = {
269 MODULE_DEVICE_TABLE(i2c, bt856_id);
271 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
273 .driverid = I2C_DRIVERID_BT856,
274 .command = bt856_command,
275 .probe = bt856_probe,
276 .remove = bt856_remove,
277 .id_table = bt856_id,