diff options
Diffstat (limited to 'drivers/media/video/wm8739.c')
-rw-r--r-- | drivers/media/video/wm8739.c | 327 |
1 files changed, 327 insertions, 0 deletions
diff --git a/drivers/media/video/wm8739.c b/drivers/media/video/wm8739.c new file mode 100644 index 0000000..54ac3fe --- /dev/null +++ b/drivers/media/video/wm8739.c @@ -0,0 +1,327 @@ +/* + * wm8739 + * + * Copyright (C) 2005 T. Adachi <tadachi@tadachi-net.com> + * + * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl> + * - Cleanup + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/ioctl.h> +#include <asm/uaccess.h> +#include <linux/i2c.h> +#include <linux/i2c-id.h> +#include <linux/videodev2.h> +#include <media/v4l2-common.h> +#include <media/v4l2-chip-ident.h> +#include <media/v4l2-i2c-drv.h> + +MODULE_DESCRIPTION("wm8739 driver"); +MODULE_AUTHOR("T. Adachi, Hans Verkuil"); +MODULE_LICENSE("GPL"); + +static int debug; + +module_param(debug, int, 0644); + +MODULE_PARM_DESC(debug, "Debug level (0-1)"); + + +/* ------------------------------------------------------------------------ */ + +enum { + R0 = 0, R1, + R5 = 5, R6, R7, R8, R9, R15 = 15, + TOT_REGS +}; + +struct wm8739_state { + u32 clock_freq; + u8 muted; + u16 volume; + u16 balance; + u8 vol_l; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */ + u8 vol_r; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */ +}; + +/* ------------------------------------------------------------------------ */ + +static int wm8739_write(struct i2c_client *client, int reg, u16 val) +{ + int i; + + if (reg < 0 || reg >= TOT_REGS) { + v4l_err(client, "Invalid register R%d\n", reg); + return -1; + } + + v4l_dbg(1, debug, client, "write: %02x %02x\n", reg, val); + + for (i = 0; i < 3; i++) + if (i2c_smbus_write_byte_data(client, + (reg << 1) | (val >> 8), val & 0xff) == 0) + return 0; + v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg); + return -1; +} + +/* write regs to set audio volume etc */ +static void wm8739_set_audio(struct i2c_client *client) +{ + struct wm8739_state *state = i2c_get_clientdata(client); + u16 mute = state->muted ? 0x80 : 0; + + /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB + * Default setting: 0x17 = 0 dB + */ + wm8739_write(client, R0, (state->vol_l & 0x1f) | mute); + wm8739_write(client, R1, (state->vol_r & 0x1f) | mute); +} + +static int wm8739_get_ctrl(struct i2c_client *client, struct v4l2_control *ctrl) +{ + struct wm8739_state *state = i2c_get_clientdata(client); + + switch (ctrl->id) { + case V4L2_CID_AUDIO_MUTE: + ctrl->value = state->muted; + break; + + case V4L2_CID_AUDIO_VOLUME: + ctrl->value = state->volume; + break; + + case V4L2_CID_AUDIO_BALANCE: + ctrl->value = state->balance; + break; + + default: + return -EINVAL; + } + return 0; +} + +static int wm8739_set_ctrl(struct i2c_client *client, struct v4l2_control *ctrl) +{ + struct wm8739_state *state = i2c_get_clientdata(client); + unsigned int work_l, work_r; + + switch (ctrl->id) { + case V4L2_CID_AUDIO_MUTE: + state->muted = ctrl->value; + break; + + case V4L2_CID_AUDIO_VOLUME: + state->volume = ctrl->value; + break; + + case V4L2_CID_AUDIO_BALANCE: + state->balance = ctrl->value; + break; + + default: + return -EINVAL; + } + + /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */ + work_l = (min(65536 - state->balance, 32768) * state->volume) / 32768; + work_r = (min(state->balance, (u16)32768) * state->volume) / 32768; + + state->vol_l = (long)work_l * 31 / 65535; + state->vol_r = (long)work_r * 31 / 65535; + + /* set audio volume etc. */ + wm8739_set_audio(client); + return 0; +} + +/* ------------------------------------------------------------------------ */ + +static struct v4l2_queryctrl wm8739_qctrl[] = { + { + .id = V4L2_CID_AUDIO_VOLUME, + .name = "Volume", + .minimum = 0, + .maximum = 65535, + .step = 65535/100, + .default_value = 58880, + .flags = 0, + .type = V4L2_CTRL_TYPE_INTEGER, + }, { + .id = V4L2_CID_AUDIO_MUTE, + .name = "Mute", + .minimum = 0, + .maximum = 1, + .step = 1, + .default_value = 1, + .flags = 0, + .type = V4L2_CTRL_TYPE_BOOLEAN, + }, { + .id = V4L2_CID_AUDIO_BALANCE, + .name = "Balance", + .minimum = 0, + .maximum = 65535, + .step = 65535/100, + .default_value = 32768, + .flags = 0, + .type = V4L2_CTRL_TYPE_INTEGER, + } +}; + +/* ------------------------------------------------------------------------ */ + +static int wm8739_command(struct i2c_client *client, unsigned cmd, void *arg) +{ + struct wm8739_state *state = i2c_get_clientdata(client); + + switch (cmd) { + case VIDIOC_INT_AUDIO_CLOCK_FREQ: + { + u32 audiofreq = *(u32 *)arg; + + state->clock_freq = audiofreq; + /* de-activate */ + wm8739_write(client, R9, 0x000); + switch (audiofreq) { + case 44100: + /* 256fps, fs=44.1k */ + wm8739_write(client, R8, 0x020); + break; + case 48000: + /* 256fps, fs=48k */ + wm8739_write(client, R8, 0x000); + break; + case 32000: + /* 256fps, fs=32k */ + wm8739_write(client, R8, 0x018); + break; + default: + break; + } + /* activate */ + wm8739_write(client, R9, 0x001); + break; + } + + case VIDIOC_G_CTRL: + return wm8739_get_ctrl(client, arg); + + case VIDIOC_S_CTRL: + return wm8739_set_ctrl(client, arg); + + case VIDIOC_QUERYCTRL: + { + struct v4l2_queryctrl *qc = arg; + int i; + + for (i = 0; i < ARRAY_SIZE(wm8739_qctrl); i++) + if (qc->id && qc->id == wm8739_qctrl[i].id) { + memcpy(qc, &wm8739_qctrl[i], sizeof(*qc)); + return 0; + } + return -EINVAL; + } + + case VIDIOC_G_CHIP_IDENT: + return v4l2_chip_ident_i2c_client(client, + arg, V4L2_IDENT_WM8739, 0); + + case VIDIOC_LOG_STATUS: + v4l_info(client, "Frequency: %u Hz\n", state->clock_freq); + v4l_info(client, "Volume L: %02x%s\n", state->vol_l & 0x1f, + state->muted ? " (muted)" : ""); + v4l_info(client, "Volume R: %02x%s\n", state->vol_r & 0x1f, + state->muted ? " (muted)" : ""); + break; + + default: + return -EINVAL; + } + + return 0; +} + +/* ------------------------------------------------------------------------ */ + +/* i2c implementation */ + +static int wm8739_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct wm8739_state *state; + + /* Check if the adapter supports the needed features */ + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -EIO; + + v4l_info(client, "chip found @ 0x%x (%s)\n", + client->addr << 1, client->adapter->name); + + state = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL); + if (state == NULL) + return -ENOMEM; + state->vol_l = 0x17; /* 0dB */ + state->vol_r = 0x17; /* 0dB */ + state->muted = 0; + state->balance = 32768; + /* normalize (12dB(31) to -34.5dB(0) [0dB(23)] -> 65535 to 0) */ + state->volume = ((long)state->vol_l + 1) * 65535 / 31; + state->clock_freq = 48000; + i2c_set_clientdata(client, state); + + /* Initialize wm8739 */ + + /* reset */ + wm8739_write(client, R15, 0x00); + /* filter setting, high path, offet clear */ + wm8739_write(client, R5, 0x000); + /* ADC, OSC, Power Off mode Disable */ + wm8739_write(client, R6, 0x000); + /* Digital Audio interface format: + Enable Master mode, 24 bit, MSB first/left justified */ + wm8739_write(client, R7, 0x049); + /* sampling control: normal, 256fs, 48KHz sampling rate */ + wm8739_write(client, R8, 0x000); + /* activate */ + wm8739_write(client, R9, 0x001); + /* set volume/mute */ + wm8739_set_audio(client); + return 0; +} + +static int wm8739_remove(struct i2c_client *client) +{ + kfree(i2c_get_clientdata(client)); + return 0; +} + +static const struct i2c_device_id wm8739_id[] = { + { "wm8739", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, wm8739_id); + +static struct v4l2_i2c_driver_data v4l2_i2c_data = { + .name = "wm8739", + .driverid = I2C_DRIVERID_WM8739, + .command = wm8739_command, + .probe = wm8739_probe, + .remove = wm8739_remove, + .id_table = wm8739_id, +}; |