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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * wm87394 *5 * Copyright (C) 2005 T. Adachi <tadachi@tadachi-net.com>6 *7 * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>8 * - Cleanup9 */10 11#include <linux/module.h>12#include <linux/types.h>13#include <linux/slab.h>14#include <linux/ioctl.h>15#include <linux/uaccess.h>16#include <linux/i2c.h>17#include <linux/videodev2.h>18#include <media/v4l2-device.h>19#include <media/v4l2-ctrls.h>20 21MODULE_DESCRIPTION("wm8739 driver");22MODULE_AUTHOR("T. Adachi, Hans Verkuil");23MODULE_LICENSE("GPL");24 25static int debug;26 27module_param(debug, int, 0644);28 29MODULE_PARM_DESC(debug, "Debug level (0-1)");30 31 32/* ------------------------------------------------------------------------ */33 34enum {35 R0 = 0, R1,36 R5 = 5, R6, R7, R8, R9, R15 = 15,37 TOT_REGS38};39 40struct wm8739_state {41 struct v4l2_subdev sd;42 struct v4l2_ctrl_handler hdl;43 struct {44 /* audio cluster */45 struct v4l2_ctrl *volume;46 struct v4l2_ctrl *mute;47 struct v4l2_ctrl *balance;48 };49 u32 clock_freq;50};51 52static inline struct wm8739_state *to_state(struct v4l2_subdev *sd)53{54 return container_of(sd, struct wm8739_state, sd);55}56 57static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)58{59 return &container_of(ctrl->handler, struct wm8739_state, hdl)->sd;60}61 62/* ------------------------------------------------------------------------ */63 64static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val)65{66 struct i2c_client *client = v4l2_get_subdevdata(sd);67 int i;68 69 if (reg < 0 || reg >= TOT_REGS) {70 v4l2_err(sd, "Invalid register R%d\n", reg);71 return -1;72 }73 74 v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val);75 76 for (i = 0; i < 3; i++)77 if (i2c_smbus_write_byte_data(client,78 (reg << 1) | (val >> 8), val & 0xff) == 0)79 return 0;80 v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);81 return -1;82}83 84static int wm8739_s_ctrl(struct v4l2_ctrl *ctrl)85{86 struct v4l2_subdev *sd = to_sd(ctrl);87 struct wm8739_state *state = to_state(sd);88 unsigned int work_l, work_r;89 u8 vol_l; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */90 u8 vol_r; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */91 u16 mute;92 93 switch (ctrl->id) {94 case V4L2_CID_AUDIO_VOLUME:95 break;96 97 default:98 return -EINVAL;99 }100 101 /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */102 work_l = (min(65536 - state->balance->val, 32768) * state->volume->val) / 32768;103 work_r = (min(state->balance->val, 32768) * state->volume->val) / 32768;104 105 vol_l = (long)work_l * 31 / 65535;106 vol_r = (long)work_r * 31 / 65535;107 108 /* set audio volume etc. */109 mute = state->mute->val ? 0x80 : 0;110 111 /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB112 * Default setting: 0x17 = 0 dB113 */114 wm8739_write(sd, R0, (vol_l & 0x1f) | mute);115 wm8739_write(sd, R1, (vol_r & 0x1f) | mute);116 return 0;117}118 119/* ------------------------------------------------------------------------ */120 121static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq)122{123 struct wm8739_state *state = to_state(sd);124 125 state->clock_freq = audiofreq;126 /* de-activate */127 wm8739_write(sd, R9, 0x000);128 switch (audiofreq) {129 case 44100:130 /* 256fps, fs=44.1k */131 wm8739_write(sd, R8, 0x020);132 break;133 case 48000:134 /* 256fps, fs=48k */135 wm8739_write(sd, R8, 0x000);136 break;137 case 32000:138 /* 256fps, fs=32k */139 wm8739_write(sd, R8, 0x018);140 break;141 default:142 break;143 }144 /* activate */145 wm8739_write(sd, R9, 0x001);146 return 0;147}148 149static int wm8739_log_status(struct v4l2_subdev *sd)150{151 struct wm8739_state *state = to_state(sd);152 153 v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq);154 v4l2_ctrl_handler_log_status(&state->hdl, sd->name);155 return 0;156}157 158/* ----------------------------------------------------------------------- */159 160static const struct v4l2_ctrl_ops wm8739_ctrl_ops = {161 .s_ctrl = wm8739_s_ctrl,162};163 164static const struct v4l2_subdev_core_ops wm8739_core_ops = {165 .log_status = wm8739_log_status,166};167 168static const struct v4l2_subdev_audio_ops wm8739_audio_ops = {169 .s_clock_freq = wm8739_s_clock_freq,170};171 172static const struct v4l2_subdev_ops wm8739_ops = {173 .core = &wm8739_core_ops,174 .audio = &wm8739_audio_ops,175};176 177/* ------------------------------------------------------------------------ */178 179/* i2c implementation */180 181static int wm8739_probe(struct i2c_client *client)182{183 struct wm8739_state *state;184 struct v4l2_subdev *sd;185 186 /* Check if the adapter supports the needed features */187 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))188 return -EIO;189 190 v4l_info(client, "chip found @ 0x%x (%s)\n",191 client->addr << 1, client->adapter->name);192 193 state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);194 if (state == NULL)195 return -ENOMEM;196 sd = &state->sd;197 v4l2_i2c_subdev_init(sd, client, &wm8739_ops);198 v4l2_ctrl_handler_init(&state->hdl, 2);199 state->volume = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,200 V4L2_CID_AUDIO_VOLUME, 0, 65535, 65535 / 100, 50736);201 state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,202 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);203 state->balance = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,204 V4L2_CID_AUDIO_BALANCE, 0, 65535, 65535 / 100, 32768);205 sd->ctrl_handler = &state->hdl;206 if (state->hdl.error) {207 int err = state->hdl.error;208 209 v4l2_ctrl_handler_free(&state->hdl);210 return err;211 }212 v4l2_ctrl_cluster(3, &state->volume);213 214 state->clock_freq = 48000;215 216 /* Initialize wm8739 */217 218 /* reset */219 wm8739_write(sd, R15, 0x00);220 /* filter setting, high path, offet clear */221 wm8739_write(sd, R5, 0x000);222 /* ADC, OSC, Power Off mode Disable */223 wm8739_write(sd, R6, 0x000);224 /* Digital Audio interface format:225 Enable Master mode, 24 bit, MSB first/left justified */226 wm8739_write(sd, R7, 0x049);227 /* sampling control: normal, 256fs, 48KHz sampling rate */228 wm8739_write(sd, R8, 0x000);229 /* activate */230 wm8739_write(sd, R9, 0x001);231 /* set volume/mute */232 v4l2_ctrl_handler_setup(&state->hdl);233 return 0;234}235 236static void wm8739_remove(struct i2c_client *client)237{238 struct v4l2_subdev *sd = i2c_get_clientdata(client);239 struct wm8739_state *state = to_state(sd);240 241 v4l2_device_unregister_subdev(sd);242 v4l2_ctrl_handler_free(&state->hdl);243}244 245static const struct i2c_device_id wm8739_id[] = {246 { "wm8739" },247 { }248};249MODULE_DEVICE_TABLE(i2c, wm8739_id);250 251static struct i2c_driver wm8739_driver = {252 .driver = {253 .name = "wm8739",254 },255 .probe = wm8739_probe,256 .remove = wm8739_remove,257 .id_table = wm8739_id,258};259 260module_i2c_driver(wm8739_driver);261