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/types.h> 33 #include <linux/slab.h> 34 #include <linux/ioctl.h> 35 #include <asm/uaccess.h> 36 #include <linux/i2c.h> 37 #include <linux/videodev2.h> 38 #include <media/v4l2-device.h> 39 40 MODULE_DESCRIPTION("Brooktree-856A video encoder driver"); 41 MODULE_AUTHOR("Mike Bernson & Dave Perks"); 42 MODULE_LICENSE("GPL"); 43 44 static int debug; 45 module_param(debug, int, 0); 46 MODULE_PARM_DESC(debug, "Debug level (0-1)"); 47 48 49 /* ----------------------------------------------------------------------- */ 50 51 #define BT856_REG_OFFSET 0xDA 52 #define BT856_NR_REG 6 53 54 struct bt856 { 55 struct v4l2_subdev sd; 56 unsigned char reg[BT856_NR_REG]; 57 58 v4l2_std_id norm; 59 }; 60 61 static inline struct bt856 *to_bt856(struct v4l2_subdev *sd) 62 { 63 return container_of(sd, struct bt856, sd); 64 } 65 66 /* ----------------------------------------------------------------------- */ 67 68 static inline int bt856_write(struct bt856 *encoder, u8 reg, u8 value) 69 { 70 struct i2c_client *client = v4l2_get_subdevdata(&encoder->sd); 71 72 encoder->reg[reg - BT856_REG_OFFSET] = value; 73 return i2c_smbus_write_byte_data(client, reg, value); 74 } 75 76 static inline int bt856_setbit(struct bt856 *encoder, u8 reg, u8 bit, u8 value) 77 { 78 return bt856_write(encoder, reg, 79 (encoder->reg[reg - BT856_REG_OFFSET] & ~(1 << bit)) | 80 (value ? (1 << bit) : 0)); 81 } 82 83 static void bt856_dump(struct bt856 *encoder) 84 { 85 int i; 86 87 v4l2_info(&encoder->sd, "register dump:\n"); 88 for (i = 0; i < BT856_NR_REG; i += 2) 89 printk(KERN_CONT " %02x", encoder->reg[i]); 90 printk(KERN_CONT "\n"); 91 } 92 93 /* ----------------------------------------------------------------------- */ 94 95 static int bt856_init(struct v4l2_subdev *sd, u32 arg) 96 { 97 struct bt856 *encoder = to_bt856(sd); 98 99 /* This is just for testing!!! */ 100 v4l2_dbg(1, debug, sd, "init\n"); 101 bt856_write(encoder, 0xdc, 0x18); 102 bt856_write(encoder, 0xda, 0); 103 bt856_write(encoder, 0xde, 0); 104 105 bt856_setbit(encoder, 0xdc, 3, 1); 106 /*bt856_setbit(encoder, 0xdc, 6, 0);*/ 107 bt856_setbit(encoder, 0xdc, 4, 1); 108 109 if (encoder->norm & V4L2_STD_NTSC) 110 bt856_setbit(encoder, 0xdc, 2, 0); 111 else 112 bt856_setbit(encoder, 0xdc, 2, 1); 113 114 bt856_setbit(encoder, 0xdc, 1, 1); 115 bt856_setbit(encoder, 0xde, 4, 0); 116 bt856_setbit(encoder, 0xde, 3, 1); 117 if (debug != 0) 118 bt856_dump(encoder); 119 return 0; 120 } 121 122 static int bt856_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std) 123 { 124 struct bt856 *encoder = to_bt856(sd); 125 126 v4l2_dbg(1, debug, sd, "set norm %llx\n", (unsigned long long)std); 127 128 if (std & V4L2_STD_NTSC) { 129 bt856_setbit(encoder, 0xdc, 2, 0); 130 } else if (std & V4L2_STD_PAL) { 131 bt856_setbit(encoder, 0xdc, 2, 1); 132 bt856_setbit(encoder, 0xda, 0, 0); 133 /*bt856_setbit(encoder, 0xda, 0, 1);*/ 134 } else { 135 return -EINVAL; 136 } 137 encoder->norm = std; 138 if (debug != 0) 139 bt856_dump(encoder); 140 return 0; 141 } 142 143 static int bt856_s_routing(struct v4l2_subdev *sd, 144 u32 input, u32 output, u32 config) 145 { 146 struct bt856 *encoder = to_bt856(sd); 147 148 v4l2_dbg(1, debug, sd, "set input %d\n", input); 149 150 /* We only have video bus. 151 * input= 0: input is from bt819 152 * input= 1: input is from ZR36060 */ 153 switch (input) { 154 case 0: 155 bt856_setbit(encoder, 0xde, 4, 0); 156 bt856_setbit(encoder, 0xde, 3, 1); 157 bt856_setbit(encoder, 0xdc, 3, 1); 158 bt856_setbit(encoder, 0xdc, 6, 0); 159 break; 160 case 1: 161 bt856_setbit(encoder, 0xde, 4, 0); 162 bt856_setbit(encoder, 0xde, 3, 1); 163 bt856_setbit(encoder, 0xdc, 3, 1); 164 bt856_setbit(encoder, 0xdc, 6, 1); 165 break; 166 case 2: /* Color bar */ 167 bt856_setbit(encoder, 0xdc, 3, 0); 168 bt856_setbit(encoder, 0xde, 4, 1); 169 break; 170 default: 171 return -EINVAL; 172 } 173 174 if (debug != 0) 175 bt856_dump(encoder); 176 return 0; 177 } 178 179 /* ----------------------------------------------------------------------- */ 180 181 static const struct v4l2_subdev_core_ops bt856_core_ops = { 182 .init = bt856_init, 183 }; 184 185 static const struct v4l2_subdev_video_ops bt856_video_ops = { 186 .s_std_output = bt856_s_std_output, 187 .s_routing = bt856_s_routing, 188 }; 189 190 static const struct v4l2_subdev_ops bt856_ops = { 191 .core = &bt856_core_ops, 192 .video = &bt856_video_ops, 193 }; 194 195 /* ----------------------------------------------------------------------- */ 196 197 static int bt856_probe(struct i2c_client *client, 198 const struct i2c_device_id *id) 199 { 200 struct bt856 *encoder; 201 struct v4l2_subdev *sd; 202 203 /* Check if the adapter supports the needed features */ 204 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 205 return -ENODEV; 206 207 v4l_info(client, "chip found @ 0x%x (%s)\n", 208 client->addr << 1, client->adapter->name); 209 210 encoder = devm_kzalloc(&client->dev, sizeof(*encoder), GFP_KERNEL); 211 if (encoder == NULL) 212 return -ENOMEM; 213 sd = &encoder->sd; 214 v4l2_i2c_subdev_init(sd, client, &bt856_ops); 215 encoder->norm = V4L2_STD_NTSC; 216 217 bt856_write(encoder, 0xdc, 0x18); 218 bt856_write(encoder, 0xda, 0); 219 bt856_write(encoder, 0xde, 0); 220 221 bt856_setbit(encoder, 0xdc, 3, 1); 222 /*bt856_setbit(encoder, 0xdc, 6, 0);*/ 223 bt856_setbit(encoder, 0xdc, 4, 1); 224 225 if (encoder->norm & V4L2_STD_NTSC) 226 bt856_setbit(encoder, 0xdc, 2, 0); 227 else 228 bt856_setbit(encoder, 0xdc, 2, 1); 229 230 bt856_setbit(encoder, 0xdc, 1, 1); 231 bt856_setbit(encoder, 0xde, 4, 0); 232 bt856_setbit(encoder, 0xde, 3, 1); 233 234 if (debug != 0) 235 bt856_dump(encoder); 236 return 0; 237 } 238 239 static int bt856_remove(struct i2c_client *client) 240 { 241 struct v4l2_subdev *sd = i2c_get_clientdata(client); 242 243 v4l2_device_unregister_subdev(sd); 244 return 0; 245 } 246 247 static const struct i2c_device_id bt856_id[] = { 248 { "bt856", 0 }, 249 { } 250 }; 251 MODULE_DEVICE_TABLE(i2c, bt856_id); 252 253 static struct i2c_driver bt856_driver = { 254 .driver = { 255 .name = "bt856", 256 }, 257 .probe = bt856_probe, 258 .remove = bt856_remove, 259 .id_table = bt856_id, 260 }; 261 262 module_i2c_driver(bt856_driver); 263