360 lines
8.8 KiB
C
360 lines
8.8 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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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/ioctl.h>
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#include <asm/uaccess.h>
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#include <linux/i2c.h>
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#include <linux/i2c-id.h>
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#include <linux/videodev.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-chip-ident.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 = 0;
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static unsigned short normal_i2c[] = { 0x34 >> 1, 0x36 >> 1, I2C_CLIENT_END };
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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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I2C_CLIENT_INSMOD;
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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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u32 clock_freq;
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u8 muted;
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u16 volume;
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u16 balance;
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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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};
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/* ------------------------------------------------------------------------ */
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static int wm8739_write(struct i2c_client *client, int reg, u16 val)
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{
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int i;
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if (reg < 0 || reg >= TOT_REGS) {
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v4l_err(client, "Invalid register R%d\n", reg);
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return -1;
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}
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v4l_dbg(1, debug, client, "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, (reg << 1) |
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(val >> 8), val & 0xff) == 0) {
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return 0;
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}
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}
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v4l_err(client, "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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/* write regs to set audio volume etc */
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static void wm8739_set_audio(struct i2c_client *client)
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{
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struct wm8739_state *state = i2c_get_clientdata(client);
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u16 mute = state->muted ? 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(client, R0, (state->vol_l & 0x1f) | mute);
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wm8739_write(client, R1, (state->vol_r & 0x1f) | mute);
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}
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static int wm8739_get_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
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{
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struct wm8739_state *state = i2c_get_clientdata(client);
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_MUTE:
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ctrl->value = state->muted;
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break;
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case V4L2_CID_AUDIO_VOLUME:
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ctrl->value = state->volume;
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break;
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case V4L2_CID_AUDIO_BALANCE:
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ctrl->value = state->balance;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int wm8739_set_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
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{
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struct wm8739_state *state = i2c_get_clientdata(client);
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unsigned int work_l, work_r;
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_MUTE:
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state->muted = ctrl->value;
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break;
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case V4L2_CID_AUDIO_VOLUME:
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state->volume = ctrl->value;
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break;
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case V4L2_CID_AUDIO_BALANCE:
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state->balance = ctrl->value;
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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, 32768) * state->volume) / 32768;
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work_r = (min(state->balance, (u16)32768) * state->volume) / 32768;
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state->vol_l = (long)work_l * 31 / 65535;
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state->vol_r = (long)work_r * 31 / 65535;
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/* set audio volume etc. */
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wm8739_set_audio(client);
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return 0;
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}
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/* ------------------------------------------------------------------------ */
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static struct v4l2_queryctrl wm8739_qctrl[] = {
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{
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.id = V4L2_CID_AUDIO_VOLUME,
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.name = "Volume",
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.minimum = 0,
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.maximum = 65535,
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.step = 65535/100,
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.default_value = 58880,
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.flags = 0,
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.type = V4L2_CTRL_TYPE_INTEGER,
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},{
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.id = V4L2_CID_AUDIO_MUTE,
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.name = "Mute",
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.minimum = 0,
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.maximum = 1,
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.step = 1,
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.default_value = 1,
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.flags = 0,
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.type = V4L2_CTRL_TYPE_BOOLEAN,
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},{
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.id = V4L2_CID_AUDIO_BALANCE,
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.name = "Balance",
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.minimum = 0,
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.maximum = 65535,
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.step = 65535/100,
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.default_value = 32768,
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.flags = 0,
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.type = V4L2_CTRL_TYPE_INTEGER,
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}
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};
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/* ------------------------------------------------------------------------ */
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static int wm8739_command(struct i2c_client *client, unsigned int cmd, void *arg)
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{
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struct wm8739_state *state = i2c_get_clientdata(client);
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switch (cmd) {
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case VIDIOC_INT_AUDIO_CLOCK_FREQ:
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{
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u32 audiofreq = *(u32 *)arg;
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state->clock_freq = audiofreq;
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wm8739_write(client, R9, 0x000); /* de-activate */
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switch (audiofreq) {
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case 44100:
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wm8739_write(client, R8, 0x020); /* 256fps, fs=44.1k */
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break;
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case 48000:
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wm8739_write(client, R8, 0x000); /* 256fps, fs=48k */
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break;
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case 32000:
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wm8739_write(client, R8, 0x018); /* 256fps, fs=32k */
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break;
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default:
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break;
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}
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wm8739_write(client, R9, 0x001); /* activate */
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break;
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}
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case VIDIOC_G_CTRL:
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return wm8739_get_ctrl(client, arg);
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case VIDIOC_S_CTRL:
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return wm8739_set_ctrl(client, arg);
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case VIDIOC_QUERYCTRL:
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{
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struct v4l2_queryctrl *qc = arg;
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int i;
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for (i = 0; i < ARRAY_SIZE(wm8739_qctrl); i++)
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if (qc->id && qc->id == wm8739_qctrl[i].id) {
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memcpy(qc, &wm8739_qctrl[i], sizeof(*qc));
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return 0;
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}
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return -EINVAL;
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}
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case VIDIOC_G_CHIP_IDENT:
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return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_WM8739, 0);
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case VIDIOC_LOG_STATUS:
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v4l_info(client, "Frequency: %u Hz\n", state->clock_freq);
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v4l_info(client, "Volume L: %02x%s\n", state->vol_l & 0x1f,
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state->muted ? " (muted)" : "");
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v4l_info(client, "Volume R: %02x%s\n", state->vol_r & 0x1f,
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state->muted ? " (muted)" : "");
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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/* ------------------------------------------------------------------------ */
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/* i2c implementation */
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static struct i2c_driver i2c_driver;
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static int wm8739_attach(struct i2c_adapter *adapter, int address, int kind)
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{
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struct i2c_client *client;
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struct wm8739_state *state;
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/* Check if the adapter supports the needed features */
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return 0;
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client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
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if (client == NULL)
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return -ENOMEM;
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client->addr = address;
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client->adapter = adapter;
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client->driver = &i2c_driver;
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snprintf(client->name, sizeof(client->name) - 1, "wm8739");
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v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
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state = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL);
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if (state == NULL) {
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kfree(client);
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return -ENOMEM;
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}
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state->vol_l = 0x17; /* 0dB */
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state->vol_r = 0x17; /* 0dB */
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state->muted = 0;
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state->balance = 32768;
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/* normalize (12dB(31) to -34.5dB(0) [0dB(23)] -> 65535 to 0) */
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state->volume = ((long)state->vol_l + 1) * 65535 / 31;
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state->clock_freq = 48000;
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i2c_set_clientdata(client, state);
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/* initialize wm8739 */
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wm8739_write(client, R15, 0x00); /* reset */
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wm8739_write(client, R5, 0x000); /* filter setting, high path, offet clear */
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wm8739_write(client, R6, 0x000); /* ADC, OSC, Power Off mode Disable */
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wm8739_write(client, R7, 0x049); /* Digital Audio interface format */
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/* Enable Master mode */
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/* 24 bit, MSB first/left justified */
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wm8739_write(client, R8, 0x000); /* sampling control */
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/* normal, 256fs, 48KHz sampling rate */
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wm8739_write(client, R9, 0x001); /* activate */
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wm8739_set_audio(client); /* set volume/mute */
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i2c_attach_client(client);
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return 0;
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}
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static int wm8739_probe(struct i2c_adapter *adapter)
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{
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if (adapter->class & I2C_CLASS_TV_ANALOG)
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return i2c_probe(adapter, &addr_data, wm8739_attach);
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return 0;
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}
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static int wm8739_detach(struct i2c_client *client)
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{
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int err;
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err = i2c_detach_client(client);
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if (err)
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return err;
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kfree(client);
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return 0;
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}
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/* ----------------------------------------------------------------------- */
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/* i2c implementation */
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static struct i2c_driver i2c_driver = {
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.driver = {
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.name = "wm8739",
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},
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.id = I2C_DRIVERID_WM8739,
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.attach_adapter = wm8739_probe,
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.detach_client = wm8739_detach,
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.command = wm8739_command,
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};
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static int __init wm8739_init_module(void)
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{
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return i2c_add_driver(&i2c_driver);
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}
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static void __exit wm8739_cleanup_module(void)
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{
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i2c_del_driver(&i2c_driver);
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}
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module_init(wm8739_init_module);
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module_exit(wm8739_cleanup_module);
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