diff options
Diffstat (limited to 'drivers/media/i2c/wm8739.c')
| -rw-r--r-- | drivers/media/i2c/wm8739.c | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/drivers/media/i2c/wm8739.c b/drivers/media/i2c/wm8739.c new file mode 100644 index 000000000..23464d064 --- /dev/null +++ b/drivers/media/i2c/wm8739.c @@ -0,0 +1,271 @@ +/* + * 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. + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/ioctl.h> +#include <linux/uaccess.h> +#include <linux/i2c.h> +#include <linux/videodev2.h> +#include <media/v4l2-device.h> +#include <media/v4l2-ctrls.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 { + struct v4l2_subdev sd; + struct v4l2_ctrl_handler hdl; + struct { + /* audio cluster */ + struct v4l2_ctrl *volume; + struct v4l2_ctrl *mute; + struct v4l2_ctrl *balance; + }; + u32 clock_freq; +}; + +static inline struct wm8739_state *to_state(struct v4l2_subdev *sd) +{ + return container_of(sd, struct wm8739_state, sd); +} + +static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl) +{ + return &container_of(ctrl->handler, struct wm8739_state, hdl)->sd; +} + +/* ------------------------------------------------------------------------ */ + +static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val) +{ + struct i2c_client *client = v4l2_get_subdevdata(sd); + int i; + + if (reg < 0 || reg >= TOT_REGS) { + v4l2_err(sd, "Invalid register R%d\n", reg); + return -1; + } + + v4l2_dbg(1, debug, sd, "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; + v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg); + return -1; +} + +static int wm8739_s_ctrl(struct v4l2_ctrl *ctrl) +{ + struct v4l2_subdev *sd = to_sd(ctrl); + struct wm8739_state *state = to_state(sd); + unsigned int work_l, work_r; + 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 */ + u16 mute; + + switch (ctrl->id) { + case V4L2_CID_AUDIO_VOLUME: + break; + + default: + return -EINVAL; + } + + /* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */ + work_l = (min(65536 - state->balance->val, 32768) * state->volume->val) / 32768; + work_r = (min(state->balance->val, 32768) * state->volume->val) / 32768; + + vol_l = (long)work_l * 31 / 65535; + vol_r = (long)work_r * 31 / 65535; + + /* set audio volume etc. */ + mute = state->mute->val ? 0x80 : 0; + + /* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB + * Default setting: 0x17 = 0 dB + */ + wm8739_write(sd, R0, (vol_l & 0x1f) | mute); + wm8739_write(sd, R1, (vol_r & 0x1f) | mute); + return 0; +} + +/* ------------------------------------------------------------------------ */ + +static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq) +{ + struct wm8739_state *state = to_state(sd); + + state->clock_freq = audiofreq; + /* de-activate */ + wm8739_write(sd, R9, 0x000); + switch (audiofreq) { + case 44100: + /* 256fps, fs=44.1k */ + wm8739_write(sd, R8, 0x020); + break; + case 48000: + /* 256fps, fs=48k */ + wm8739_write(sd, R8, 0x000); + break; + case 32000: + /* 256fps, fs=32k */ + wm8739_write(sd, R8, 0x018); + break; + default: + break; + } + /* activate */ + wm8739_write(sd, R9, 0x001); + return 0; +} + +static int wm8739_log_status(struct v4l2_subdev *sd) +{ + struct wm8739_state *state = to_state(sd); + + v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq); + v4l2_ctrl_handler_log_status(&state->hdl, sd->name); + return 0; +} + +/* ----------------------------------------------------------------------- */ + +static const struct v4l2_ctrl_ops wm8739_ctrl_ops = { + .s_ctrl = wm8739_s_ctrl, +}; + +static const struct v4l2_subdev_core_ops wm8739_core_ops = { + .log_status = wm8739_log_status, +}; + +static const struct v4l2_subdev_audio_ops wm8739_audio_ops = { + .s_clock_freq = wm8739_s_clock_freq, +}; + +static const struct v4l2_subdev_ops wm8739_ops = { + .core = &wm8739_core_ops, + .audio = &wm8739_audio_ops, +}; + +/* ------------------------------------------------------------------------ */ + +/* i2c implementation */ + +static int wm8739_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct wm8739_state *state; + struct v4l2_subdev *sd; + + /* 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 = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL); + if (state == NULL) + return -ENOMEM; + sd = &state->sd; + v4l2_i2c_subdev_init(sd, client, &wm8739_ops); + v4l2_ctrl_handler_init(&state->hdl, 2); + state->volume = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops, + V4L2_CID_AUDIO_VOLUME, 0, 65535, 65535 / 100, 50736); + state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops, + V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0); + state->balance = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops, + V4L2_CID_AUDIO_BALANCE, 0, 65535, 65535 / 100, 32768); + sd->ctrl_handler = &state->hdl; + if (state->hdl.error) { + int err = state->hdl.error; + + v4l2_ctrl_handler_free(&state->hdl); + return err; + } + v4l2_ctrl_cluster(3, &state->volume); + + state->clock_freq = 48000; + + /* Initialize wm8739 */ + + /* reset */ + wm8739_write(sd, R15, 0x00); + /* filter setting, high path, offet clear */ + wm8739_write(sd, R5, 0x000); + /* ADC, OSC, Power Off mode Disable */ + wm8739_write(sd, R6, 0x000); + /* Digital Audio interface format: + Enable Master mode, 24 bit, MSB first/left justified */ + wm8739_write(sd, R7, 0x049); + /* sampling control: normal, 256fs, 48KHz sampling rate */ + wm8739_write(sd, R8, 0x000); + /* activate */ + wm8739_write(sd, R9, 0x001); + /* set volume/mute */ + v4l2_ctrl_handler_setup(&state->hdl); + return 0; +} + +static int wm8739_remove(struct i2c_client *client) +{ + struct v4l2_subdev *sd = i2c_get_clientdata(client); + struct wm8739_state *state = to_state(sd); + + v4l2_device_unregister_subdev(sd); + v4l2_ctrl_handler_free(&state->hdl); + return 0; +} + +static const struct i2c_device_id wm8739_id[] = { + { "wm8739", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, wm8739_id); + +static struct i2c_driver wm8739_driver = { + .driver = { + .name = "wm8739", + }, + .probe = wm8739_probe, + .remove = wm8739_remove, + .id_table = wm8739_id, +}; + +module_i2c_driver(wm8739_driver); |