drivers/media/i2c/upd64083.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * upd6408x - NEC Electronics 3-Dimensional Y/C separation driver
   4  *
   5  * 2003 by T.Adachi (tadachi@tadachi-net.com)
   6  * 2003 by Takeru KOMORIYA <komoriya@paken.org>
   7  * 2006 by Hans Verkuil <hverkuil@xs4all.nl>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/i2c.h>
  13 #include <linux/videodev2.h>
  14 #include <linux/slab.h>
  15 #include <media/v4l2-device.h>
  16 #include <media/i2c/upd64083.h>
  17
  18 MODULE_DESCRIPTION("uPD64083 driver");
  19 MODULE_AUTHOR("T. Adachi, Takeru KOMORIYA, Hans Verkuil");
  20 MODULE_LICENSE("GPL");
  21
  22 static bool debug;
  23 module_param(debug, bool, 0644);
  24
  25 MODULE_PARM_DESC(debug, "Debug level (0-1)");
  26
  27
  28 enum {
  29         R00 = 0, R01, R02, R03, R04,
  30         R05, R06, R07, R08, R09,
  31         R0A, R0B, R0C, R0D, R0E, R0F,
  32         R10, R11, R12, R13, R14,
  33         R15, R16,
  34         TOT_REGS
  35 };
  36
  37 struct upd64083_state {
  38         struct v4l2_subdev sd;
  39         u8 mode;
  40         u8 ext_y_adc;
  41         u8 regs[TOT_REGS];
  42 };
  43
  44 static inline struct upd64083_state *to_state(struct v4l2_subdev *sd)
  45 {
  46         return container_of(sd, struct upd64083_state, sd);
  47 }
  48
  49 /* Initial values when used in combination with the
  50    NEC upd64031a ghost reduction chip. */
  51 static u8 upd64083_init[] = {
  52         0x1f, 0x01, 0xa0, 0x2d, 0x29,  /* we use EXCSS=0 */
  53         0x36, 0xdd, 0x05, 0x56, 0x48,
  54         0x00, 0x3a, 0xa0, 0x05, 0x08,
  55         0x44, 0x60, 0x08, 0x52, 0xf8,
  56         0x53, 0x60, 0x10
  57 };
  58
  59 /* ------------------------------------------------------------------------ */
  60
  61 static void upd64083_write(struct v4l2_subdev *sd, u8 reg, u8 val)
  62 {
  63         struct i2c_client *client = v4l2_get_subdevdata(sd);
  64         u8 buf[2];
  65
  66         buf[0] = reg;
  67         buf[1] = val;
  68         v4l2_dbg(1, debug, sd, "write reg: %02x val: %02x\n", reg, val);
  69         if (i2c_master_send(client, buf, 2) != 2)
  70                 v4l2_err(sd, "I/O error write 0x%02x/0x%02x\n", reg, val);
  71 }
  72
  73 /* ------------------------------------------------------------------------ */
  74
  75 #ifdef CONFIG_VIDEO_ADV_DEBUG
  76 static u8 upd64083_read(struct v4l2_subdev *sd, u8 reg)
  77 {
  78         struct i2c_client *client = v4l2_get_subdevdata(sd);
  79         u8 buf[7];
  80
  81         if (reg >= sizeof(buf))
  82                 return 0xff;
  83         i2c_master_recv(client, buf, sizeof(buf));
  84         return buf[reg];
  85 }
  86 #endif
  87
  88 /* ------------------------------------------------------------------------ */
  89
  90 static int upd64083_s_routing(struct v4l2_subdev *sd,
  91                               u32 input, u32 output, u32 config)
  92 {
  93         struct upd64083_state *state = to_state(sd);
  94         u8 r00, r02;
  95
  96         if (input > 7 || (input & 6) == 6)
  97                 return -EINVAL;
  98         state->mode = (input & 3) << 6;
  99         state->ext_y_adc = (input & UPD64083_EXT_Y_ADC) << 3;
 100         r00 = (state->regs[R00] & ~(3 << 6)) | state->mode;
 101         r02 = (state->regs[R02] & ~(1 << 5)) | state->ext_y_adc;
 102         upd64083_write(sd, R00, r00);
 103         upd64083_write(sd, R02, r02);
 104         return 0;
 105 }
 106
 107 #ifdef CONFIG_VIDEO_ADV_DEBUG
 108 static int upd64083_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
 109 {
 110         reg->val = upd64083_read(sd, reg->reg & 0xff);
 111         reg->size = 1;
 112         return 0;
 113 }
 114
 115 static int upd64083_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
 116 {
 117         upd64083_write(sd, reg->reg & 0xff, reg->val & 0xff);
 118         return 0;
 119 }
 120 #endif
 121
 122 static int upd64083_log_status(struct v4l2_subdev *sd)
 123 {
 124         struct i2c_client *client = v4l2_get_subdevdata(sd);
 125         u8 buf[7];
 126
 127         i2c_master_recv(client, buf, 7);
 128         v4l2_info(sd, "Status: SA00=%02x SA01=%02x SA02=%02x SA03=%02x "
 129                       "SA04=%02x SA05=%02x SA06=%02x\n",
 130                 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 131         return 0;
 132 }
 133
 134 /* ----------------------------------------------------------------------- */
 135
 136 static const struct v4l2_subdev_core_ops upd64083_core_ops = {
 137         .log_status = upd64083_log_status,
 138 #ifdef CONFIG_VIDEO_ADV_DEBUG
 139         .g_register = upd64083_g_register,
 140         .s_register = upd64083_s_register,
 141 #endif
 142 };
 143
 144 static const struct v4l2_subdev_video_ops upd64083_video_ops = {
 145         .s_routing = upd64083_s_routing,
 146 };
 147
 148 static const struct v4l2_subdev_ops upd64083_ops = {
 149         .core = &upd64083_core_ops,
 150         .video = &upd64083_video_ops,
 151 };
 152
 153 /* ------------------------------------------------------------------------ */
 154
 155 /* i2c implementation */
 156
 157 static int upd64083_probe(struct i2c_client *client)
 158 {
 159         struct upd64083_state *state;
 160         struct v4l2_subdev *sd;
 161         int i;
 162
 163         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 164                 return -EIO;
 165
 166         v4l_info(client, "chip found @ 0x%x (%s)\n",
 167                         client->addr << 1, client->adapter->name);
 168
 169         state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 170         if (state == NULL)
 171                 return -ENOMEM;
 172         sd = &state->sd;
 173         v4l2_i2c_subdev_init(sd, client, &upd64083_ops);
 174         /* Initially assume that a ghost reduction chip is present */
 175         state->mode = 0;  /* YCS mode */
 176         state->ext_y_adc = (1 << 5);
 177         memcpy(state->regs, upd64083_init, TOT_REGS);
 178         for (i = 0; i < TOT_REGS; i++)
 179                 upd64083_write(sd, i, state->regs[i]);
 180         return 0;
 181 }
 182
 183 static void upd64083_remove(struct i2c_client *client)
 184 {
 185         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 186
 187         v4l2_device_unregister_subdev(sd);
 188 }
 189
 190 /* ----------------------------------------------------------------------- */
 191
 192 static const struct i2c_device_id upd64083_id[] = {
 193         { "upd64083", 0 },
 194         { }
 195 };
 196 MODULE_DEVICE_TABLE(i2c, upd64083_id);
 197
 198 static struct i2c_driver upd64083_driver = {
 199         .driver = {
 200                 .name   = "upd64083",
 201         },
 202         .probe          = upd64083_probe,
 203         .remove         = upd64083_remove,
 204         .id_table       = upd64083_id,
 205 };
 206
 207 module_i2c_driver(upd64083_driver);