263 строки
6.3 KiB
C
263 строки
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* wm8739
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*
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* Copyright (C) 2005 T. Adachi <tadachi@tadachi-net.com>
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*
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* Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
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* - Cleanup
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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/v4l2-device.h>
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#include <media/v4l2-ctrls.h>
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MODULE_DESCRIPTION("wm8739 driver");
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MODULE_AUTHOR("T. Adachi, Hans Verkuil");
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MODULE_LICENSE("GPL");
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static int debug;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug, "Debug level (0-1)");
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/* ------------------------------------------------------------------------ */
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enum {
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R0 = 0, R1,
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R5 = 5, R6, R7, R8, R9, R15 = 15,
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TOT_REGS
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};
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struct wm8739_state {
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struct v4l2_subdev sd;
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struct v4l2_ctrl_handler hdl;
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struct {
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/* audio cluster */
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struct v4l2_ctrl *volume;
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struct v4l2_ctrl *mute;
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struct v4l2_ctrl *balance;
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};
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u32 clock_freq;
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};
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static inline struct wm8739_state *to_state(struct v4l2_subdev *sd)
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{
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return container_of(sd, struct wm8739_state, sd);
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}
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static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
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{
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return &container_of(ctrl->handler, struct wm8739_state, hdl)->sd;
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}
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/* ------------------------------------------------------------------------ */
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static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val)
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{
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struct i2c_client *client = v4l2_get_subdevdata(sd);
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int i;
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if (reg < 0 || reg >= TOT_REGS) {
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v4l2_err(sd, "Invalid register R%d\n", reg);
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return -1;
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}
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v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val);
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for (i = 0; i < 3; i++)
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if (i2c_smbus_write_byte_data(client,
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(reg << 1) | (val >> 8), val & 0xff) == 0)
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return 0;
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v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
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return -1;
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}
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static int wm8739_s_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct v4l2_subdev *sd = to_sd(ctrl);
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struct wm8739_state *state = to_state(sd);
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unsigned int work_l, work_r;
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u8 vol_l; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
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u8 vol_r; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
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u16 mute;
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_VOLUME:
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break;
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default:
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return -EINVAL;
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}
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/* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
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work_l = (min(65536 - state->balance->val, 32768) * state->volume->val) / 32768;
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work_r = (min(state->balance->val, 32768) * state->volume->val) / 32768;
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vol_l = (long)work_l * 31 / 65535;
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vol_r = (long)work_r * 31 / 65535;
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/* set audio volume etc. */
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mute = state->mute->val ? 0x80 : 0;
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/* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
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* Default setting: 0x17 = 0 dB
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*/
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wm8739_write(sd, R0, (vol_l & 0x1f) | mute);
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wm8739_write(sd, R1, (vol_r & 0x1f) | mute);
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return 0;
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}
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/* ------------------------------------------------------------------------ */
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static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq)
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{
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struct wm8739_state *state = to_state(sd);
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state->clock_freq = audiofreq;
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/* de-activate */
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wm8739_write(sd, R9, 0x000);
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switch (audiofreq) {
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case 44100:
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/* 256fps, fs=44.1k */
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wm8739_write(sd, R8, 0x020);
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break;
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case 48000:
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/* 256fps, fs=48k */
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wm8739_write(sd, R8, 0x000);
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break;
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case 32000:
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/* 256fps, fs=32k */
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wm8739_write(sd, R8, 0x018);
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break;
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default:
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break;
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}
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/* activate */
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wm8739_write(sd, R9, 0x001);
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return 0;
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}
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static int wm8739_log_status(struct v4l2_subdev *sd)
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{
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struct wm8739_state *state = to_state(sd);
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v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq);
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v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
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return 0;
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}
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/* ----------------------------------------------------------------------- */
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static const struct v4l2_ctrl_ops wm8739_ctrl_ops = {
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.s_ctrl = wm8739_s_ctrl,
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};
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static const struct v4l2_subdev_core_ops wm8739_core_ops = {
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.log_status = wm8739_log_status,
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};
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static const struct v4l2_subdev_audio_ops wm8739_audio_ops = {
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.s_clock_freq = wm8739_s_clock_freq,
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};
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static const struct v4l2_subdev_ops wm8739_ops = {
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.core = &wm8739_core_ops,
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.audio = &wm8739_audio_ops,
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};
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/* ------------------------------------------------------------------------ */
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/* i2c implementation */
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static int wm8739_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct wm8739_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, &wm8739_ops);
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v4l2_ctrl_handler_init(&state->hdl, 2);
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state->volume = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
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V4L2_CID_AUDIO_VOLUME, 0, 65535, 65535 / 100, 50736);
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state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
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V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
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state->balance = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
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V4L2_CID_AUDIO_BALANCE, 0, 65535, 65535 / 100, 32768);
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sd->ctrl_handler = &state->hdl;
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if (state->hdl.error) {
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int err = state->hdl.error;
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v4l2_ctrl_handler_free(&state->hdl);
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return err;
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}
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v4l2_ctrl_cluster(3, &state->volume);
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state->clock_freq = 48000;
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/* Initialize wm8739 */
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/* reset */
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wm8739_write(sd, R15, 0x00);
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/* filter setting, high path, offet clear */
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wm8739_write(sd, R5, 0x000);
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/* ADC, OSC, Power Off mode Disable */
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wm8739_write(sd, R6, 0x000);
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/* Digital Audio interface format:
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Enable Master mode, 24 bit, MSB first/left justified */
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wm8739_write(sd, R7, 0x049);
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/* sampling control: normal, 256fs, 48KHz sampling rate */
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wm8739_write(sd, R8, 0x000);
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/* activate */
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wm8739_write(sd, R9, 0x001);
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/* set volume/mute */
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v4l2_ctrl_handler_setup(&state->hdl);
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return 0;
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}
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static int wm8739_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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struct wm8739_state *state = to_state(sd);
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v4l2_device_unregister_subdev(sd);
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v4l2_ctrl_handler_free(&state->hdl);
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return 0;
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}
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static const struct i2c_device_id wm8739_id[] = {
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{ "wm8739", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, wm8739_id);
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static struct i2c_driver wm8739_driver = {
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.driver = {
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.name = "wm8739",
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},
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.probe = wm8739_probe,
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.remove = wm8739_remove,
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.id_table = wm8739_id,
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};
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module_i2c_driver(wm8739_driver);
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