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 #include <media/v4l2-chip-ident.h> 40 41 MODULE_DESCRIPTION("Brooktree-856A video encoder driver"); 42 MODULE_AUTHOR("Mike Bernson & Dave Perks"); 43 MODULE_LICENSE("GPL"); 44 45 static int debug; 46 module_param(debug, int, 0); 47 MODULE_PARM_DESC(debug, "Debug level (0-1)"); 48 49 50 /* ----------------------------------------------------------------------- */ 51 52 #define BT856_REG_OFFSET 0xDA 53 #define BT856_NR_REG 6 54 55 struct bt856 { 56 struct v4l2_subdev sd; 57 unsigned char reg[BT856_NR_REG]; 58 59 v4l2_std_id norm; 60 }; 61 62 static inline struct bt856 *to_bt856(struct v4l2_subdev *sd) 63 { 64 return container_of(sd, struct bt856, sd); 65 } 66 67 /* ----------------------------------------------------------------------- */ 68 69 static inline int bt856_write(struct bt856 *encoder, u8 reg, u8 value) 70 { 71 struct i2c_client *client = v4l2_get_subdevdata(&encoder->sd); 72 73 encoder->reg[reg - BT856_REG_OFFSET] = value; 74 return i2c_smbus_write_byte_data(client, reg, value); 75 } 76 77 static inline int bt856_setbit(struct bt856 *encoder, u8 reg, u8 bit, u8 value) 78 { 79 return bt856_write(encoder, reg, 80 (encoder->reg[reg - BT856_REG_OFFSET] & ~(1 << bit)) | 81 (value ? (1 << bit) : 0)); 82 } 83 84 static void bt856_dump(struct bt856 *encoder) 85 { 86 int i; 87 88 v4l2_info(&encoder->sd, "register dump:\n"); 89 for (i = 0; i < BT856_NR_REG; i += 2) 90 printk(KERN_CONT " %02x", encoder->reg[i]); 91 printk(KERN_CONT "\n"); 92 } 93 94 /* ----------------------------------------------------------------------- */ 95 96 static int bt856_init(struct v4l2_subdev *sd, u32 arg) 97 { 98 struct bt856 *encoder = to_bt856(sd); 99 100 /* This is just for testing!!! */ 101 v4l2_dbg(1, debug, sd, "init\n"); 102 bt856_write(encoder, 0xdc, 0x18); 103 bt856_write(encoder, 0xda, 0); 104 bt856_write(encoder, 0xde, 0); 105 106 bt856_setbit(encoder, 0xdc, 3, 1); 107 /*bt856_setbit(encoder, 0xdc, 6, 0);*/ 108 bt856_setbit(encoder, 0xdc, 4, 1); 109 110 if (encoder->norm & V4L2_STD_NTSC) 111 bt856_setbit(encoder, 0xdc, 2, 0); 112 else 113 bt856_setbit(encoder, 0xdc, 2, 1); 114 115 bt856_setbit(encoder, 0xdc, 1, 1); 116 bt856_setbit(encoder, 0xde, 4, 0); 117 bt856_setbit(encoder, 0xde, 3, 1); 118 if (debug != 0) 119 bt856_dump(encoder); 120 return 0; 121 } 122 123 static int bt856_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std) 124 { 125 struct bt856 *encoder = to_bt856(sd); 126 127 v4l2_dbg(1, debug, sd, "set norm %llx\n", (unsigned long long)std); 128 129 if (std & V4L2_STD_NTSC) { 130 bt856_setbit(encoder, 0xdc, 2, 0); 131 } else if (std & V4L2_STD_PAL) { 132 bt856_setbit(encoder, 0xdc, 2, 1); 133 bt856_setbit(encoder, 0xda, 0, 0); 134 /*bt856_setbit(encoder, 0xda, 0, 1);*/ 135 } else { 136 return -EINVAL; 137 } 138 encoder->norm = std; 139 if (debug != 0) 140 bt856_dump(encoder); 141 return 0; 142 } 143 144 static int bt856_s_routing(struct v4l2_subdev *sd, 145 u32 input, u32 output, u32 config) 146 { 147 struct bt856 *encoder = to_bt856(sd); 148 149 v4l2_dbg(1, debug, sd, "set input %d\n", input); 150 151 /* We only have video bus. 152 * input= 0: input is from bt819 153 * input= 1: input is from ZR36060 */ 154 switch (input) { 155 case 0: 156 bt856_setbit(encoder, 0xde, 4, 0); 157 bt856_setbit(encoder, 0xde, 3, 1); 158 bt856_setbit(encoder, 0xdc, 3, 1); 159 bt856_setbit(encoder, 0xdc, 6, 0); 160 break; 161 case 1: 162 bt856_setbit(encoder, 0xde, 4, 0); 163 bt856_setbit(encoder, 0xde, 3, 1); 164 bt856_setbit(encoder, 0xdc, 3, 1); 165 bt856_setbit(encoder, 0xdc, 6, 1); 166 break; 167 case 2: /* Color bar */ 168 bt856_setbit(encoder, 0xdc, 3, 0); 169 bt856_setbit(encoder, 0xde, 4, 1); 170 break; 171 default: 172 return -EINVAL; 173 } 174 175 if (debug != 0) 176 bt856_dump(encoder); 177 return 0; 178 } 179 180 static int bt856_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) 181 { 182 struct i2c_client *client = v4l2_get_subdevdata(sd); 183 184 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_BT856, 0); 185 } 186 187 /* ----------------------------------------------------------------------- */ 188 189 static const struct v4l2_subdev_core_ops bt856_core_ops = { 190 .g_chip_ident = bt856_g_chip_ident, 191 .init = bt856_init, 192 }; 193 194 static const struct v4l2_subdev_video_ops bt856_video_ops = { 195 .s_std_output = bt856_s_std_output, 196 .s_routing = bt856_s_routing, 197 }; 198 199 static const struct v4l2_subdev_ops bt856_ops = { 200 .core = &bt856_core_ops, 201 .video = &bt856_video_ops, 202 }; 203 204 /* ----------------------------------------------------------------------- */ 205 206 static int bt856_probe(struct i2c_client *client, 207 const struct i2c_device_id *id) 208 { 209 struct bt856 *encoder; 210 struct v4l2_subdev *sd; 211 212 /* Check if the adapter supports the needed features */ 213 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 214 return -ENODEV; 215 216 v4l_info(client, "chip found @ 0x%x (%s)\n", 217 client->addr << 1, client->adapter->name); 218 219 encoder = kzalloc(sizeof(struct bt856), GFP_KERNEL); 220 if (encoder == NULL) 221 return -ENOMEM; 222 sd = &encoder->sd; 223 v4l2_i2c_subdev_init(sd, client, &bt856_ops); 224 encoder->norm = V4L2_STD_NTSC; 225 226 bt856_write(encoder, 0xdc, 0x18); 227 bt856_write(encoder, 0xda, 0); 228 bt856_write(encoder, 0xde, 0); 229 230 bt856_setbit(encoder, 0xdc, 3, 1); 231 /*bt856_setbit(encoder, 0xdc, 6, 0);*/ 232 bt856_setbit(encoder, 0xdc, 4, 1); 233 234 if (encoder->norm & V4L2_STD_NTSC) 235 bt856_setbit(encoder, 0xdc, 2, 0); 236 else 237 bt856_setbit(encoder, 0xdc, 2, 1); 238 239 bt856_setbit(encoder, 0xdc, 1, 1); 240 bt856_setbit(encoder, 0xde, 4, 0); 241 bt856_setbit(encoder, 0xde, 3, 1); 242 243 if (debug != 0) 244 bt856_dump(encoder); 245 return 0; 246 } 247 248 static int bt856_remove(struct i2c_client *client) 249 { 250 struct v4l2_subdev *sd = i2c_get_clientdata(client); 251 252 v4l2_device_unregister_subdev(sd); 253 kfree(to_bt856(sd)); 254 return 0; 255 } 256 257 static const struct i2c_device_id bt856_id[] = { 258 { "bt856", 0 }, 259 { } 260 }; 261 MODULE_DEVICE_TABLE(i2c, bt856_id); 262 263 static struct i2c_driver bt856_driver = { 264 .driver = { 265 .owner = THIS_MODULE, 266 .name = "bt856", 267 }, 268 .probe = bt856_probe, 269 .remove = bt856_remove, 270 .id_table = bt856_id, 271 }; 272 273 module_i2c_driver(bt856_driver); 274