linux/drivers/media/i2c/upd64031a.c
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   1/*
   2 * upd64031A - NEC Electronics Ghost Reduction for NTSC in Japan
   3 *
   4 * 2003 by T.Adachi <tadachi@tadachi-net.com>
   5 * 2003 by Takeru KOMORIYA <komoriya@paken.org>
   6 * 2006 by Hans Verkuil <hverkuil@xs4all.nl>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful,
  14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23
  24#include <linux/module.h>
  25#include <linux/kernel.h>
  26#include <linux/i2c.h>
  27#include <linux/videodev2.h>
  28#include <linux/slab.h>
  29#include <media/v4l2-device.h>
  30#include <media/v4l2-chip-ident.h>
  31#include <media/upd64031a.h>
  32
  33/* --------------------- read registers functions define -------------------- */
  34
  35/* bit masks */
  36#define GR_MODE_MASK              0xc0
  37#define DIRECT_3DYCS_CONNECT_MASK 0xc0
  38#define SYNC_CIRCUIT_MASK         0xa0
  39
  40/* -------------------------------------------------------------------------- */
  41
  42MODULE_DESCRIPTION("uPD64031A driver");
  43MODULE_AUTHOR("T. Adachi, Takeru KOMORIYA, Hans Verkuil");
  44MODULE_LICENSE("GPL");
  45
  46static int debug;
  47module_param(debug, int, 0644);
  48
  49MODULE_PARM_DESC(debug, "Debug level (0-1)");
  50
  51
  52enum {
  53        R00 = 0, R01, R02, R03, R04,
  54        R05, R06, R07, R08, R09,
  55        R0A, R0B, R0C, R0D, R0E, R0F,
  56        /* unused registers
  57         R10, R11, R12, R13, R14,
  58         R15, R16, R17,
  59         */
  60        TOT_REGS
  61};
  62
  63struct upd64031a_state {
  64        struct v4l2_subdev sd;
  65        u8 regs[TOT_REGS];
  66        u8 gr_mode;
  67        u8 direct_3dycs_connect;
  68        u8 ext_comp_sync;
  69        u8 ext_vert_sync;
  70};
  71
  72static inline struct upd64031a_state *to_state(struct v4l2_subdev *sd)
  73{
  74        return container_of(sd, struct upd64031a_state, sd);
  75}
  76
  77static u8 upd64031a_init[] = {
  78        0x00, 0xb8, 0x48, 0xd2, 0xe6,
  79        0x03, 0x10, 0x0b, 0xaf, 0x7f,
  80        0x00, 0x00, 0x1d, 0x5e, 0x00,
  81        0xd0
  82};
  83
  84/* ------------------------------------------------------------------------ */
  85
  86static u8 upd64031a_read(struct v4l2_subdev *sd, u8 reg)
  87{
  88        struct i2c_client *client = v4l2_get_subdevdata(sd);
  89        u8 buf[2];
  90
  91        if (reg >= sizeof(buf))
  92                return 0xff;
  93        i2c_master_recv(client, buf, 2);
  94        return buf[reg];
  95}
  96
  97/* ------------------------------------------------------------------------ */
  98
  99static void upd64031a_write(struct v4l2_subdev *sd, u8 reg, u8 val)
 100{
 101        struct i2c_client *client = v4l2_get_subdevdata(sd);
 102        u8 buf[2];
 103
 104        buf[0] = reg;
 105        buf[1] = val;
 106        v4l2_dbg(1, debug, sd, "write reg: %02X val: %02X\n", reg, val);
 107        if (i2c_master_send(client, buf, 2) != 2)
 108                v4l2_err(sd, "I/O error write 0x%02x/0x%02x\n", reg, val);
 109}
 110
 111/* ------------------------------------------------------------------------ */
 112
 113/* The input changed due to new input or channel changed */
 114static int upd64031a_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequency *freq)
 115{
 116        struct upd64031a_state *state = to_state(sd);
 117        u8 reg = state->regs[R00];
 118
 119        v4l2_dbg(1, debug, sd, "changed input or channel\n");
 120        upd64031a_write(sd, R00, reg | 0x10);
 121        upd64031a_write(sd, R00, reg & ~0x10);
 122        return 0;
 123}
 124
 125/* ------------------------------------------------------------------------ */
 126
 127static int upd64031a_s_routing(struct v4l2_subdev *sd,
 128                               u32 input, u32 output, u32 config)
 129{
 130        struct upd64031a_state *state = to_state(sd);
 131        u8 r00, r05, r08;
 132
 133        state->gr_mode = (input & 3) << 6;
 134        state->direct_3dycs_connect = (input & 0xc) << 4;
 135        state->ext_comp_sync =
 136                (input & UPD64031A_COMPOSITE_EXTERNAL) << 1;
 137        state->ext_vert_sync =
 138                (input & UPD64031A_VERTICAL_EXTERNAL) << 2;
 139        r00 = (state->regs[R00] & ~GR_MODE_MASK) | state->gr_mode;
 140        r05 = (state->regs[R00] & ~SYNC_CIRCUIT_MASK) |
 141                state->ext_comp_sync | state->ext_vert_sync;
 142        r08 = (state->regs[R08] & ~DIRECT_3DYCS_CONNECT_MASK) |
 143                state->direct_3dycs_connect;
 144        upd64031a_write(sd, R00, r00);
 145        upd64031a_write(sd, R05, r05);
 146        upd64031a_write(sd, R08, r08);
 147        return upd64031a_s_frequency(sd, NULL);
 148}
 149
 150static int upd64031a_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 151{
 152        struct i2c_client *client = v4l2_get_subdevdata(sd);
 153
 154        return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_UPD64031A, 0);
 155}
 156
 157static int upd64031a_log_status(struct v4l2_subdev *sd)
 158{
 159        v4l2_info(sd, "Status: SA00=0x%02x SA01=0x%02x\n",
 160                        upd64031a_read(sd, 0), upd64031a_read(sd, 1));
 161        return 0;
 162}
 163
 164#ifdef CONFIG_VIDEO_ADV_DEBUG
 165static int upd64031a_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 166{
 167        struct i2c_client *client = v4l2_get_subdevdata(sd);
 168
 169        if (!v4l2_chip_match_i2c_client(client, &reg->match))
 170                return -EINVAL;
 171        if (!capable(CAP_SYS_ADMIN))
 172                return -EPERM;
 173        reg->val = upd64031a_read(sd, reg->reg & 0xff);
 174        reg->size = 1;
 175        return 0;
 176}
 177
 178static int upd64031a_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
 179{
 180        struct i2c_client *client = v4l2_get_subdevdata(sd);
 181
 182        if (!v4l2_chip_match_i2c_client(client, &reg->match))
 183                return -EINVAL;
 184        if (!capable(CAP_SYS_ADMIN))
 185                return -EPERM;
 186        upd64031a_write(sd, reg->reg & 0xff, reg->val & 0xff);
 187        return 0;
 188}
 189#endif
 190
 191/* ----------------------------------------------------------------------- */
 192
 193static const struct v4l2_subdev_core_ops upd64031a_core_ops = {
 194        .log_status = upd64031a_log_status,
 195        .g_chip_ident = upd64031a_g_chip_ident,
 196#ifdef CONFIG_VIDEO_ADV_DEBUG
 197        .g_register = upd64031a_g_register,
 198        .s_register = upd64031a_s_register,
 199#endif
 200};
 201
 202static const struct v4l2_subdev_tuner_ops upd64031a_tuner_ops = {
 203        .s_frequency = upd64031a_s_frequency,
 204};
 205
 206static const struct v4l2_subdev_video_ops upd64031a_video_ops = {
 207        .s_routing = upd64031a_s_routing,
 208};
 209
 210static const struct v4l2_subdev_ops upd64031a_ops = {
 211        .core = &upd64031a_core_ops,
 212        .tuner = &upd64031a_tuner_ops,
 213        .video = &upd64031a_video_ops,
 214};
 215
 216/* ------------------------------------------------------------------------ */
 217
 218/* i2c implementation */
 219
 220static int upd64031a_probe(struct i2c_client *client,
 221                           const struct i2c_device_id *id)
 222{
 223        struct upd64031a_state *state;
 224        struct v4l2_subdev *sd;
 225        int i;
 226
 227        if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 228                return -EIO;
 229
 230        v4l_info(client, "chip found @ 0x%x (%s)\n",
 231                        client->addr << 1, client->adapter->name);
 232
 233        state = kzalloc(sizeof(struct upd64031a_state), GFP_KERNEL);
 234        if (state == NULL)
 235                return -ENOMEM;
 236        sd = &state->sd;
 237        v4l2_i2c_subdev_init(sd, client, &upd64031a_ops);
 238        memcpy(state->regs, upd64031a_init, sizeof(state->regs));
 239        state->gr_mode = UPD64031A_GR_ON << 6;
 240        state->direct_3dycs_connect = UPD64031A_3DYCS_COMPOSITE << 4;
 241        state->ext_comp_sync = state->ext_vert_sync = 0;
 242        for (i = 0; i < TOT_REGS; i++)
 243                upd64031a_write(sd, i, state->regs[i]);
 244        return 0;
 245}
 246
 247static int upd64031a_remove(struct i2c_client *client)
 248{
 249        struct v4l2_subdev *sd = i2c_get_clientdata(client);
 250
 251        v4l2_device_unregister_subdev(sd);
 252        kfree(to_state(sd));
 253        return 0;
 254}
 255
 256/* ----------------------------------------------------------------------- */
 257
 258static const struct i2c_device_id upd64031a_id[] = {
 259        { "upd64031a", 0 },
 260        { }
 261};
 262MODULE_DEVICE_TABLE(i2c, upd64031a_id);
 263
 264static struct i2c_driver upd64031a_driver = {
 265        .driver = {
 266                .owner  = THIS_MODULE,
 267                .name   = "upd64031a",
 268        },
 269        .probe          = upd64031a_probe,
 270        .remove         = upd64031a_remove,
 271        .id_table       = upd64031a_id,
 272};
 273
 274module_i2c_driver(upd64031a_driver);
 275