LXR linux/drivers/media/i2c/m52790.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * m52790 i2c ivtv driver.
   4 * Copyright (C) 2007  Hans Verkuil
   5 *
   6 * A/V source switching Mitsubishi M52790SP/FP
   7 */
   8
   9
  10#include <linux/module.h>
  11#include <linux/types.h>
  12#include <linux/slab.h>
  13#include <linux/ioctl.h>
  14#include <linux/uaccess.h>
  15#include <linux/i2c.h>
  16#include <linux/videodev2.h>
  17#include <media/i2c/m52790.h>
  18#include <media/v4l2-device.h>
  19
  20MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch");
  21MODULE_AUTHOR("Hans Verkuil");
  22MODULE_LICENSE("GPL");
  23
  24
  25struct m52790_state {
  26        struct v4l2_subdev sd;
  27        u16 input;
  28        u16 output;
  29};
  30
  31static inline struct m52790_state *to_state(struct v4l2_subdev *sd)
  32{
  33        return container_of(sd, struct m52790_state, sd);
  34}
  35
  36/* ----------------------------------------------------------------------- */
  37
  38static int m52790_write(struct v4l2_subdev *sd)
  39{
  40        struct m52790_state *state = to_state(sd);
  41        struct i2c_client *client = v4l2_get_subdevdata(sd);
  42
  43        u8 sw1 = (state->input | state->output) & 0xff;
  44        u8 sw2 = (state->input | state->output) >> 8;
  45
  46        return i2c_smbus_write_byte_data(client, sw1, sw2);
  47}
  48
  49/* Note: audio and video are linked and cannot be switched separately.
  50   So audio and video routing commands are identical for this chip.
  51   In theory the video amplifier and audio modes could be handled
  52   separately for the output, but that seems to be overkill right now.
  53   The same holds for implementing an audio mute control, this is now
  54   part of the audio output routing. The normal case is that another
  55   chip takes care of the actual muting so making it part of the
  56   output routing seems to be the right thing to do for now. */
  57static int m52790_s_routing(struct v4l2_subdev *sd,
  58                            u32 input, u32 output, u32 config)
  59{
  60        struct m52790_state *state = to_state(sd);
  61
  62        state->input = input;
  63        state->output = output;
  64        m52790_write(sd);
  65        return 0;
  66}
  67
  68#ifdef CONFIG_VIDEO_ADV_DEBUG
  69static int m52790_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
  70{
  71        struct m52790_state *state = to_state(sd);
  72
  73        if (reg->reg != 0)
  74                return -EINVAL;
  75        reg->size = 1;
  76        reg->val = state->input | state->output;
  77        return 0;
  78}
  79
  80static int m52790_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
  81{
  82        struct m52790_state *state = to_state(sd);
  83
  84        if (reg->reg != 0)
  85                return -EINVAL;
  86        state->input = reg->val & 0x0303;
  87        state->output = reg->val & ~0x0303;
  88        m52790_write(sd);
  89        return 0;
  90}
  91#endif
  92
  93static int m52790_log_status(struct v4l2_subdev *sd)
  94{
  95        struct m52790_state *state = to_state(sd);
  96
  97        v4l2_info(sd, "Switch 1: %02x\n",
  98                        (state->input | state->output) & 0xff);
  99        v4l2_info(sd, "Switch 2: %02x\n",
 100                        (state->input | state->output) >> 8);
 101        return 0;
 102}
 103
 104/* ----------------------------------------------------------------------- */
 105
 106static const struct v4l2_subdev_core_ops m52790_core_ops = {
 107        .log_status = m52790_log_status,
 108#ifdef CONFIG_VIDEO_ADV_DEBUG
 109        .g_register = m52790_g_register,
 110        .s_register = m52790_s_register,
 111#endif
 112};
 113
 114static const struct v4l2_subdev_audio_ops m52790_audio_ops = {
 115        .s_routing = m52790_s_routing,
 116};
 117
 118static const struct v4l2_subdev_video_ops m52790_video_ops = {
 119        .s_routing = m52790_s_routing,
 120};
 121
 122static const struct v4l2_subdev_ops m52790_ops = {
 123        .core = &m52790_core_ops,
 124        .audio = &m52790_audio_ops,
 125        .video = &m52790_video_ops,
 126};
 127
 128/* ----------------------------------------------------------------------- */
 129
 130/* i2c implementation */
 131
 132static int m52790_probe(struct i2c_client *client,
 133                        const struct i2c_device_id *id)
 134{
 135        struct m52790_state *state;
 136        struct v4l2_subdev *sd;
 137
 138        /* Check if the adapter supports the needed features */
 139        if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 140                return -EIO;
 141
 142        v4l_info(client, "chip found @ 0x%x (%s)\n",
 143                        client->addr << 1, client->adapter->name);
 144
 145        state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 146        if (state == NULL)
 147                return -ENOMEM;
 148
 149        sd = &state->sd;
 150        v4l2_i2c_subdev_init(sd, client, &m52790_ops);
 151        state->input = M52790_IN_TUNER;
 152        state->output = M52790_OUT_STEREO;
 153        m52790_write(sd);
 154        return 0;
 155}
 156
 157static int m52790_remove(struct i2c_client *client)
 158{
 159        struct v4l2_subdev *sd = i2c_get_clientdata(client);
 160
 161        v4l2_device_unregister_subdev(sd);
 162        return 0;
 163}
 164
 165/* ----------------------------------------------------------------------- */
 166
 167static const struct i2c_device_id m52790_id[] = {
 168        { "m52790", 0 },
 169        { }
 170};
 171MODULE_DEVICE_TABLE(i2c, m52790_id);
 172
 173static struct i2c_driver m52790_driver = {
 174        .driver = {
 175                .name   = "m52790",
 176        },
 177        .probe          = m52790_probe,
 178        .remove         = m52790_remove,
 179        .id_table       = m52790_id,
 180};
 181
 182module_i2c_driver(m52790_driver);
 183