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262 lines
6.3 KiB
262 lines
6.3 KiB
// 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 <[email protected]> |
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* |
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* Copyright (C) 2005 Hans Verkuil <[email protected]> |
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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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