drivers/media/i2c/ths7303.c

   1 /*
   2  * ths7303/53- THS7303/53 Video Amplifier driver
   3  *
   4  * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
   5  * Copyright 2013 Cisco Systems, Inc. and/or its affiliates.
   6  *
   7  * Author: Chaithrika U S <chaithrika@ti.com>
   8  *
   9  * Contributors:
  10  *     Hans Verkuil <hans.verkuil@cisco.com>
  11  *     Lad, Prabhakar <prabhakar.lad@ti.com>
  12  *     Martin Bugge <marbugge@cisco.com>
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License as
  16  * published by the Free Software Foundation version 2.
  17  *
  18  * This program is distributed .as is. WITHOUT ANY WARRANTY of any
  19  * kind, whether express or implied; without even the implied warranty
  20  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  */
  23
  24 #include <linux/i2c.h>
  25 #include <linux/module.h>
  26 #include <linux/slab.h>
  27
  28 #include <media/ths7303.h>
  29 #include <media/v4l2-device.h>
  30
  31 #define THS7303_CHANNEL_1       1
  32 #define THS7303_CHANNEL_2       2
  33 #define THS7303_CHANNEL_3       3
  34
  35 struct ths7303_state {
  36         struct v4l2_subdev              sd;
  37         const struct ths7303_platform_data *pdata;
  38         struct v4l2_bt_timings          bt;
  39         int std_id;
  40         int stream_on;
  41 };
  42
  43 enum ths7303_filter_mode {
  44         THS7303_FILTER_MODE_480I_576I,
  45         THS7303_FILTER_MODE_480P_576P,
  46         THS7303_FILTER_MODE_720P_1080I,
  47         THS7303_FILTER_MODE_1080P,
  48         THS7303_FILTER_MODE_DISABLE
  49 };
  50
  51 MODULE_DESCRIPTION("TI THS7303 video amplifier driver");
  52 MODULE_AUTHOR("Chaithrika U S");
  53 MODULE_LICENSE("GPL");
  54
  55 static int debug;
  56 module_param(debug, int, 0644);
  57 MODULE_PARM_DESC(debug, "Debug level 0-1");
  58
  59 static inline struct ths7303_state *to_state(struct v4l2_subdev *sd)
  60 {
  61         return container_of(sd, struct ths7303_state, sd);
  62 }
  63
  64 static int ths7303_read(struct v4l2_subdev *sd, u8 reg)
  65 {
  66         struct i2c_client *client = v4l2_get_subdevdata(sd);
  67
  68         return i2c_smbus_read_byte_data(client, reg);
  69 }
  70
  71 static int ths7303_write(struct v4l2_subdev *sd, u8 reg, u8 val)
  72 {
  73         struct i2c_client *client = v4l2_get_subdevdata(sd);
  74         int ret;
  75         int i;
  76
  77         for (i = 0; i < 3; i++) {
  78                 ret = i2c_smbus_write_byte_data(client, reg, val);
  79                 if (ret == 0)
  80                         return 0;
  81         }
  82         return ret;
  83 }
  84
  85 /* following function is used to set ths7303 */
  86 static int ths7303_setval(struct v4l2_subdev *sd,
  87                           enum ths7303_filter_mode mode)
  88 {
  89         struct i2c_client *client = v4l2_get_subdevdata(sd);
  90         struct ths7303_state *state = to_state(sd);
  91         const struct ths7303_platform_data *pdata = state->pdata;
  92         u8 val, sel = 0;
  93         int err, disable = 0;
  94
  95         if (!client)
  96                 return -EINVAL;
  97
  98         switch (mode) {
  99         case THS7303_FILTER_MODE_1080P:
 100                 sel = 0x3;      /*1080p and SXGA/UXGA */
 101                 break;
 102         case THS7303_FILTER_MODE_720P_1080I:
 103                 sel = 0x2;      /*720p, 1080i and SVGA/XGA */
 104                 break;
 105         case THS7303_FILTER_MODE_480P_576P:
 106                 sel = 0x1;      /* EDTV 480p/576p and VGA */
 107                 break;
 108         case THS7303_FILTER_MODE_480I_576I:
 109                 sel = 0x0;      /* SDTV, S-Video, 480i/576i */
 110                 break;
 111         default:
 112                 /* disable all channels */
 113                 disable = 1;
 114         }
 115
 116         val = (sel << 6) | (sel << 3);
 117         if (!disable)
 118                 val |= (pdata->ch_1 & 0x27);
 119         err = ths7303_write(sd, THS7303_CHANNEL_1, val);
 120         if (err)
 121                 goto out;
 122
 123         val = (sel << 6) | (sel << 3);
 124         if (!disable)
 125                 val |= (pdata->ch_2 & 0x27);
 126         err = ths7303_write(sd, THS7303_CHANNEL_2, val);
 127         if (err)
 128                 goto out;
 129
 130         val = (sel << 6) | (sel << 3);
 131         if (!disable)
 132                 val |= (pdata->ch_3 & 0x27);
 133         err = ths7303_write(sd, THS7303_CHANNEL_3, val);
 134         if (err)
 135                 goto out;
 136
 137         return 0;
 138 out:
 139         pr_info("write byte data failed\n");
 140         return err;
 141 }
 142
 143 static int ths7303_s_std_output(struct v4l2_subdev *sd, v4l2_std_id norm)
 144 {
 145         struct ths7303_state *state = to_state(sd);
 146
 147         if (norm & (V4L2_STD_ALL & ~V4L2_STD_SECAM)) {
 148                 state->std_id = 1;
 149                 state->bt.pixelclock = 0;
 150                 return ths7303_setval(sd, THS7303_FILTER_MODE_480I_576I);
 151         }
 152
 153         return ths7303_setval(sd, THS7303_FILTER_MODE_DISABLE);
 154 }
 155
 156 static int ths7303_config(struct v4l2_subdev *sd)
 157 {
 158         struct ths7303_state *state = to_state(sd);
 159         int res;
 160
 161         if (!state->stream_on) {
 162                 ths7303_write(sd, THS7303_CHANNEL_1,
 163                               (ths7303_read(sd, THS7303_CHANNEL_1) & 0xf8) |
 164                               0x00);
 165                 ths7303_write(sd, THS7303_CHANNEL_2,
 166                               (ths7303_read(sd, THS7303_CHANNEL_2) & 0xf8) |
 167                               0x00);
 168                 ths7303_write(sd, THS7303_CHANNEL_3,
 169                               (ths7303_read(sd, THS7303_CHANNEL_3) & 0xf8) |
 170                               0x00);
 171                 return 0;
 172         }
 173
 174         if (state->bt.pixelclock > 120000000)
 175                 res = ths7303_setval(sd, THS7303_FILTER_MODE_1080P);
 176         else if (state->bt.pixelclock > 70000000)
 177                 res = ths7303_setval(sd, THS7303_FILTER_MODE_720P_1080I);
 178         else if (state->bt.pixelclock > 20000000)
 179                 res = ths7303_setval(sd, THS7303_FILTER_MODE_480P_576P);
 180         else if (state->std_id)
 181                 res = ths7303_setval(sd, THS7303_FILTER_MODE_480I_576I);
 182         else
 183                 /* disable all channels */
 184                 res = ths7303_setval(sd, THS7303_FILTER_MODE_DISABLE);
 185
 186         return res;
 187
 188 }
 189
 190 static int ths7303_s_stream(struct v4l2_subdev *sd, int enable)
 191 {
 192         struct ths7303_state *state = to_state(sd);
 193
 194         state->stream_on = enable;
 195
 196         return ths7303_config(sd);
 197 }
 198
 199 /* for setting filter for HD output */
 200 static int ths7303_s_dv_timings(struct v4l2_subdev *sd,
 201                                struct v4l2_dv_timings *dv_timings)
 202 {
 203         struct ths7303_state *state = to_state(sd);
 204
 205         if (!dv_timings || dv_timings->type != V4L2_DV_BT_656_1120)
 206                 return -EINVAL;
 207
 208         state->bt = dv_timings->bt;
 209         state->std_id = 0;
 210
 211         return ths7303_config(sd);
 212 }
 213
 214 static const struct v4l2_subdev_video_ops ths7303_video_ops = {
 215         .s_stream       = ths7303_s_stream,
 216         .s_std_output   = ths7303_s_std_output,
 217         .s_dv_timings   = ths7303_s_dv_timings,
 218 };
 219
 220 #ifdef CONFIG_VIDEO_ADV_DEBUG
 221
 222 static int ths7303_g_register(struct v4l2_subdev *sd,
 223                               struct v4l2_dbg_register *reg)
 224 {
 225         reg->size = 1;
 226         reg->val = ths7303_read(sd, reg->reg);
 227         return 0;
 228 }
 229
 230 static int ths7303_s_register(struct v4l2_subdev *sd,
 231                               const struct v4l2_dbg_register *reg)
 232 {
 233         ths7303_write(sd, reg->reg, reg->val);
 234         return 0;
 235 }
 236 #endif
 237
 238 static const char * const stc_lpf_sel_txt[4] = {
 239         "500-kHz Filter",
 240         "2.5-MHz Filter",
 241         "5-MHz Filter",
 242         "5-MHz Filter",
 243 };
 244
 245 static const char * const in_mux_sel_txt[2] = {
 246         "Input A Select",
 247         "Input B Select",
 248 };
 249
 250 static const char * const lpf_freq_sel_txt[4] = {
 251         "9-MHz LPF",
 252         "16-MHz LPF",
 253         "35-MHz LPF",
 254         "Bypass LPF",
 255 };
 256
 257 static const char * const in_bias_sel_dis_cont_txt[8] = {
 258         "Disable Channel",
 259         "Mute Function - No Output",
 260         "DC Bias Select",
 261         "DC Bias + 250 mV Offset Select",
 262         "AC Bias Select",
 263         "Sync Tip Clamp with low bias",
 264         "Sync Tip Clamp with mid bias",
 265         "Sync Tip Clamp with high bias",
 266 };
 267
 268 static void ths7303_log_channel_status(struct v4l2_subdev *sd, u8 reg)
 269 {
 270         u8 val = ths7303_read(sd, reg);
 271
 272         if ((val & 0x7) == 0) {
 273                 v4l2_info(sd, "Channel %d Off\n", reg);
 274                 return;
 275         }
 276
 277         v4l2_info(sd, "Channel %d On\n", reg);
 278         v4l2_info(sd, "  value 0x%x\n", val);
 279         v4l2_info(sd, "  %s\n", stc_lpf_sel_txt[(val >> 6) & 0x3]);
 280         v4l2_info(sd, "  %s\n", in_mux_sel_txt[(val >> 5) & 0x1]);
 281         v4l2_info(sd, "  %s\n", lpf_freq_sel_txt[(val >> 3) & 0x3]);
 282         v4l2_info(sd, "  %s\n", in_bias_sel_dis_cont_txt[(val >> 0) & 0x7]);
 283 }
 284
 285 static int ths7303_log_status(struct v4l2_subdev *sd)
 286 {
 287         struct ths7303_state *state = to_state(sd);
 288
 289         v4l2_info(sd, "stream %s\n", state->stream_on ? "On" : "Off");
 290
 291         if (state->bt.pixelclock) {
 292                 struct v4l2_bt_timings *bt = bt = &state->bt;
 293                 u32 frame_width, frame_height;
 294
 295                 frame_width = V4L2_DV_BT_FRAME_WIDTH(bt);
 296                 frame_height = V4L2_DV_BT_FRAME_HEIGHT(bt);
 297                 v4l2_info(sd,
 298                           "timings: %dx%d%s%d (%dx%d). Pix freq. = %d Hz. Polarities = 0x%x\n",
 299                           bt->width, bt->height, bt->interlaced ? "i" : "p",
 300                           (frame_height * frame_width) > 0 ?
 301                           (int)bt->pixelclock /
 302                           (frame_height * frame_width) : 0,
 303                           frame_width, frame_height,
 304                           (int)bt->pixelclock, bt->polarities);
 305         } else {
 306                 v4l2_info(sd, "no timings set\n");
 307         }
 308
 309         ths7303_log_channel_status(sd, THS7303_CHANNEL_1);
 310         ths7303_log_channel_status(sd, THS7303_CHANNEL_2);
 311         ths7303_log_channel_status(sd, THS7303_CHANNEL_3);
 312
 313         return 0;
 314 }
 315
 316 static const struct v4l2_subdev_core_ops ths7303_core_ops = {
 317         .log_status = ths7303_log_status,
 318 #ifdef CONFIG_VIDEO_ADV_DEBUG
 319         .g_register = ths7303_g_register,
 320         .s_register = ths7303_s_register,
 321 #endif
 322 };
 323
 324 static const struct v4l2_subdev_ops ths7303_ops = {
 325         .core   = &ths7303_core_ops,
 326         .video  = &ths7303_video_ops,
 327 };
 328
 329 static int ths7303_probe(struct i2c_client *client,
 330                         const struct i2c_device_id *id)
 331 {
 332         struct ths7303_platform_data *pdata = client->dev.platform_data;
 333         struct ths7303_state *state;
 334         struct v4l2_subdev *sd;
 335
 336         if (pdata == NULL) {
 337                 dev_err(&client->dev, "No platform data\n");
 338                 return -EINVAL;
 339         }
 340
 341         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 342                 return -ENODEV;
 343
 344         v4l_info(client, "chip found @ 0x%x (%s)\n",
 345                         client->addr << 1, client->adapter->name);
 346
 347         state = devm_kzalloc(&client->dev, sizeof(struct ths7303_state),
 348                              GFP_KERNEL);
 349         if (!state)
 350                 return -ENOMEM;
 351
 352         state->pdata = pdata;
 353         sd = &state->sd;
 354         v4l2_i2c_subdev_init(sd, client, &ths7303_ops);
 355
 356         /* set to default 480I_576I filter mode */
 357         if (ths7303_setval(sd, THS7303_FILTER_MODE_480I_576I) < 0) {
 358                 v4l_err(client, "Setting to 480I_576I filter mode failed!\n");
 359                 return -EINVAL;
 360         }
 361
 362         return 0;
 363 }
 364
 365 static int ths7303_remove(struct i2c_client *client)
 366 {
 367         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 368
 369         v4l2_device_unregister_subdev(sd);
 370
 371         return 0;
 372 }
 373
 374 static const struct i2c_device_id ths7303_id[] = {
 375         {"ths7303", 0},
 376         {"ths7353", 0},
 377         {},
 378 };
 379
 380 MODULE_DEVICE_TABLE(i2c, ths7303_id);
 381
 382 static struct i2c_driver ths7303_driver = {
 383         .driver = {
 384                 .owner  = THIS_MODULE,
 385                 .name   = "ths73x3",
 386         },
 387         .probe          = ths7303_probe,
 388         .remove         = ths7303_remove,
 389         .id_table       = ths7303_id,
 390 };
 391
 392 module_i2c_driver(ths7303_driver);