181 строка
4.5 KiB
C
181 строка
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* m52790 i2c ivtv driver.
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* Copyright (C) 2007 Hans Verkuil
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*
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* A/V source switching Mitsubishi M52790SP/FP
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/ioctl.h>
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#include <linux/uaccess.h>
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#include <linux/i2c.h>
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#include <linux/videodev2.h>
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#include <media/i2c/m52790.h>
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#include <media/v4l2-device.h>
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MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch");
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MODULE_AUTHOR("Hans Verkuil");
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MODULE_LICENSE("GPL");
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struct m52790_state {
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struct v4l2_subdev sd;
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u16 input;
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u16 output;
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};
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static inline struct m52790_state *to_state(struct v4l2_subdev *sd)
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{
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return container_of(sd, struct m52790_state, sd);
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}
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/* ----------------------------------------------------------------------- */
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static int m52790_write(struct v4l2_subdev *sd)
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{
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struct m52790_state *state = to_state(sd);
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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u8 sw1 = (state->input | state->output) & 0xff;
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u8 sw2 = (state->input | state->output) >> 8;
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return i2c_smbus_write_byte_data(client, sw1, sw2);
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}
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/* Note: audio and video are linked and cannot be switched separately.
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So audio and video routing commands are identical for this chip.
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In theory the video amplifier and audio modes could be handled
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separately for the output, but that seems to be overkill right now.
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The same holds for implementing an audio mute control, this is now
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part of the audio output routing. The normal case is that another
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chip takes care of the actual muting so making it part of the
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output routing seems to be the right thing to do for now. */
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static int m52790_s_routing(struct v4l2_subdev *sd,
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u32 input, u32 output, u32 config)
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{
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struct m52790_state *state = to_state(sd);
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state->input = input;
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state->output = output;
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m52790_write(sd);
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return 0;
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}
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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static int m52790_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
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{
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struct m52790_state *state = to_state(sd);
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if (reg->reg != 0)
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return -EINVAL;
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reg->size = 1;
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reg->val = state->input | state->output;
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return 0;
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}
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static int m52790_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
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{
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struct m52790_state *state = to_state(sd);
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if (reg->reg != 0)
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return -EINVAL;
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state->input = reg->val & 0x0303;
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state->output = reg->val & ~0x0303;
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m52790_write(sd);
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return 0;
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}
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#endif
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static int m52790_log_status(struct v4l2_subdev *sd)
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{
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struct m52790_state *state = to_state(sd);
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v4l2_info(sd, "Switch 1: %02x\n",
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(state->input | state->output) & 0xff);
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v4l2_info(sd, "Switch 2: %02x\n",
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(state->input | state->output) >> 8);
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return 0;
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}
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/* ----------------------------------------------------------------------- */
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static const struct v4l2_subdev_core_ops m52790_core_ops = {
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.log_status = m52790_log_status,
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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.g_register = m52790_g_register,
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.s_register = m52790_s_register,
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#endif
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};
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static const struct v4l2_subdev_audio_ops m52790_audio_ops = {
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.s_routing = m52790_s_routing,
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};
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static const struct v4l2_subdev_video_ops m52790_video_ops = {
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.s_routing = m52790_s_routing,
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};
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static const struct v4l2_subdev_ops m52790_ops = {
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.core = &m52790_core_ops,
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.audio = &m52790_audio_ops,
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.video = &m52790_video_ops,
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};
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/* ----------------------------------------------------------------------- */
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/* i2c implementation */
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static int m52790_probe(struct i2c_client *client)
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{
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struct m52790_state *state;
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struct v4l2_subdev *sd;
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/* Check if the adapter supports the needed features */
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -EIO;
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v4l_info(client, "chip found @ 0x%x (%s)\n",
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client->addr << 1, client->adapter->name);
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state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
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if (state == NULL)
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return -ENOMEM;
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sd = &state->sd;
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v4l2_i2c_subdev_init(sd, client, &m52790_ops);
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state->input = M52790_IN_TUNER;
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state->output = M52790_OUT_STEREO;
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m52790_write(sd);
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return 0;
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}
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static void m52790_remove(struct i2c_client *client)
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{
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struct v4l2_subdev *sd = i2c_get_clientdata(client);
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v4l2_device_unregister_subdev(sd);
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}
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/* ----------------------------------------------------------------------- */
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static const struct i2c_device_id m52790_id[] = {
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{ "m52790", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, m52790_id);
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static struct i2c_driver m52790_driver = {
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.driver = {
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.name = "m52790",
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},
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.probe_new = m52790_probe,
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.remove = m52790_remove,
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.id_table = m52790_id,
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};
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module_i2c_driver(m52790_driver);
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