258 строки
6.8 KiB
C
258 строки
6.8 KiB
C
/*
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* wm8775 - driver version 0.0.1
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*
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* Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
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*
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* Based on saa7115 driver
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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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* - V4L2 API update
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* - sound fixes
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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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MODULE_DESCRIPTION("wm8775 driver");
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MODULE_AUTHOR("Ulf Eklund, Hans Verkuil");
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MODULE_LICENSE("GPL");
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static unsigned short normal_i2c[] = { 0x36 >> 1, I2C_CLIENT_END };
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I2C_CLIENT_INSMOD;
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/* ----------------------------------------------------------------------- */
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enum {
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R7 = 7, R11 = 11,
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R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23,
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TOT_REGS
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};
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struct wm8775_state {
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u8 input; /* Last selected input (0-0xf) */
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u8 muted;
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};
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static int wm8775_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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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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static int wm8775_command(struct i2c_client *client, unsigned int cmd,
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void *arg)
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{
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struct wm8775_state *state = i2c_get_clientdata(client);
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struct v4l2_audio *input = arg;
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struct v4l2_control *ctrl = arg;
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switch (cmd) {
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case VIDIOC_S_AUDIO:
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/* There are 4 inputs and one output. Zero or more inputs
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are multiplexed together to the output. Hence there are
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16 combinations.
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If only one input is active (the normal case) then the
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input values 1, 2, 4 or 8 should be used. */
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if (input->index > 15) {
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v4l_err(client, "Invalid input %d.\n", input->index);
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return -EINVAL;
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}
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state->input = input->index;
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if (state->muted)
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break;
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wm8775_write(client, R21, 0x0c0);
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wm8775_write(client, R14, 0x1d4);
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wm8775_write(client, R15, 0x1d4);
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wm8775_write(client, R21, 0x100 + state->input);
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break;
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case VIDIOC_G_AUDIO:
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memset(input, 0, sizeof(*input));
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input->index = state->input;
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break;
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case VIDIOC_G_CTRL:
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if (ctrl->id != V4L2_CID_AUDIO_MUTE)
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return -EINVAL;
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ctrl->value = state->muted;
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break;
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case VIDIOC_S_CTRL:
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if (ctrl->id != V4L2_CID_AUDIO_MUTE)
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return -EINVAL;
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state->muted = ctrl->value;
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wm8775_write(client, R21, 0x0c0);
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wm8775_write(client, R14, 0x1d4);
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wm8775_write(client, R15, 0x1d4);
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if (!state->muted)
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wm8775_write(client, R21, 0x100 + state->input);
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break;
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case VIDIOC_LOG_STATUS:
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v4l_info(client, "Input: %d%s\n", state->input,
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state->muted ? " (muted)" : "");
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break;
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case VIDIOC_S_FREQUENCY:
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/* If I remove this, then it can happen that I have no
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sound the first time I tune from static to a valid channel.
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It's difficult to reproduce and is almost certainly related
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to the zero cross detect circuit. */
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wm8775_write(client, R21, 0x0c0);
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wm8775_write(client, R14, 0x1d4);
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wm8775_write(client, R15, 0x1d4);
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wm8775_write(client, R21, 0x100 + state->input);
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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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/*
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* Generic i2c probe
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* concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
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*/
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static struct i2c_driver i2c_driver;
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static int wm8775_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 wm8775_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 == 0)
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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, "wm8775");
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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 wm8775_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->input = 2;
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state->muted = 0;
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i2c_set_clientdata(client, state);
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/* initialize wm8775 */
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wm8775_write(client, R23, 0x000); /* RESET */
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wm8775_write(client, R7, 0x000); /* Disable zero cross detect timeout */
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wm8775_write(client, R11, 0x021); /* Left justified, 24-bit mode */
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wm8775_write(client, R12, 0x102); /* Master mode, clock ratio 256fs */
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wm8775_write(client, R13, 0x000); /* Powered up */
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wm8775_write(client, R14, 0x1d4); /* ADC gain +2.5dB, enable zero cross */
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wm8775_write(client, R15, 0x1d4); /* ADC gain +2.5dB, enable zero cross */
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wm8775_write(client, R16, 0x1bf); /* ALC Stereo, ALC target level -1dB FS */
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/* max gain +8dB */
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wm8775_write(client, R17, 0x185); /* Enable gain control, use zero cross */
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/* detection, ALC hold time 42.6 ms */
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wm8775_write(client, R18, 0x0a2); /* ALC gain ramp up delay 34 s, */
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/* ALC gain ramp down delay 33 ms */
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wm8775_write(client, R19, 0x005); /* Enable noise gate, threshold -72dBfs */
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wm8775_write(client, R20, 0x07a); /* Transient window 4ms, lower PGA gain */
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/* limit -1dB */
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wm8775_write(client, R21, 0x102); /* LRBOTH = 1, use input 2. */
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i2c_attach_client(client);
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return 0;
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}
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static int wm8775_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, wm8775_attach);
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return 0;
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}
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static int wm8775_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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}
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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 = "wm8775",
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},
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.id = I2C_DRIVERID_WM8775,
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.attach_adapter = wm8775_probe,
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.detach_client = wm8775_detach,
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.command = wm8775_command,
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};
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static int __init wm8775_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 wm8775_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(wm8775_init_module);
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module_exit(wm8775_cleanup_module);
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