diff options
Diffstat (limited to 'drivers/media/i2c/wm8775.c')
| -rw-r--r-- | drivers/media/i2c/wm8775.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/drivers/media/i2c/wm8775.c b/drivers/media/i2c/wm8775.c new file mode 100644 index 0000000000..d1b716fd6f --- /dev/null +++ b/drivers/media/i2c/wm8775.c @@ -0,0 +1,306 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * wm8775 - driver version 0.0.1 + * + * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to> + * + * Based on saa7115 driver + * + * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl> + * - Cleanup + * - V4L2 API update + * - sound fixes + */ + +#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> +#include <media/i2c/wm8775.h> + +MODULE_DESCRIPTION("wm8775 driver"); +MODULE_AUTHOR("Ulf Eklund, Hans Verkuil"); +MODULE_LICENSE("GPL"); + + + +/* ----------------------------------------------------------------------- */ + +enum { + R7 = 7, R11 = 11, + R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R23 = 23, + TOT_REGS +}; + +#define ALC_HOLD 0x85 /* R17: use zero cross detection, ALC hold time 42.6 ms */ +#define ALC_EN 0x100 /* R17: ALC enable */ + +struct wm8775_state { + struct v4l2_subdev sd; + struct v4l2_ctrl_handler hdl; + struct v4l2_ctrl *mute; + struct v4l2_ctrl *vol; + struct v4l2_ctrl *bal; + struct v4l2_ctrl *loud; + u8 input; /* Last selected input (0-0xf) */ +}; + +static inline struct wm8775_state *to_state(struct v4l2_subdev *sd) +{ + return container_of(sd, struct wm8775_state, sd); +} + +static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl) +{ + return &container_of(ctrl->handler, struct wm8775_state, hdl)->sd; +} + +static int wm8775_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; + } + + 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 void wm8775_set_audio(struct v4l2_subdev *sd, int quietly) +{ + struct wm8775_state *state = to_state(sd); + u8 vol_l, vol_r; + int muted = 0 != state->mute->val; + u16 volume = (u16)state->vol->val; + u16 balance = (u16)state->bal->val; + + /* normalize ( 65535 to 0 -> 255 to 0 (+24dB to -103dB) ) */ + vol_l = (min(65536 - balance, 32768) * volume) >> 23; + vol_r = (min(balance, (u16)32768) * volume) >> 23; + + /* Mute */ + if (muted || quietly) + wm8775_write(sd, R21, 0x0c0 | state->input); + + wm8775_write(sd, R14, vol_l | 0x100); /* 0x100= Left channel ADC zero cross enable */ + wm8775_write(sd, R15, vol_r | 0x100); /* 0x100= Right channel ADC zero cross enable */ + + /* Un-mute */ + if (!muted) + wm8775_write(sd, R21, state->input); +} + +static int wm8775_s_routing(struct v4l2_subdev *sd, + u32 input, u32 output, u32 config) +{ + struct wm8775_state *state = to_state(sd); + + /* There are 4 inputs and one output. Zero or more inputs + are multiplexed together to the output. Hence there are + 16 combinations. + If only one input is active (the normal case) then the + input values 1, 2, 4 or 8 should be used. */ + if (input > 15) { + v4l2_err(sd, "Invalid input %d.\n", input); + return -EINVAL; + } + state->input = input; + if (v4l2_ctrl_g_ctrl(state->mute)) + return 0; + if (!v4l2_ctrl_g_ctrl(state->vol)) + return 0; + wm8775_set_audio(sd, 1); + return 0; +} + +static int wm8775_s_ctrl(struct v4l2_ctrl *ctrl) +{ + struct v4l2_subdev *sd = to_sd(ctrl); + + switch (ctrl->id) { + case V4L2_CID_AUDIO_MUTE: + case V4L2_CID_AUDIO_VOLUME: + case V4L2_CID_AUDIO_BALANCE: + wm8775_set_audio(sd, 0); + return 0; + case V4L2_CID_AUDIO_LOUDNESS: + wm8775_write(sd, R17, (ctrl->val ? ALC_EN : 0) | ALC_HOLD); + return 0; + } + return -EINVAL; +} + +static int wm8775_log_status(struct v4l2_subdev *sd) +{ + struct wm8775_state *state = to_state(sd); + + v4l2_info(sd, "Input: %d\n", state->input); + v4l2_ctrl_handler_log_status(&state->hdl, sd->name); + return 0; +} + +static int wm8775_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequency *freq) +{ + wm8775_set_audio(sd, 0); + return 0; +} + +/* ----------------------------------------------------------------------- */ + +static const struct v4l2_ctrl_ops wm8775_ctrl_ops = { + .s_ctrl = wm8775_s_ctrl, +}; + +static const struct v4l2_subdev_core_ops wm8775_core_ops = { + .log_status = wm8775_log_status, +}; + +static const struct v4l2_subdev_tuner_ops wm8775_tuner_ops = { + .s_frequency = wm8775_s_frequency, +}; + +static const struct v4l2_subdev_audio_ops wm8775_audio_ops = { + .s_routing = wm8775_s_routing, +}; + +static const struct v4l2_subdev_ops wm8775_ops = { + .core = &wm8775_core_ops, + .tuner = &wm8775_tuner_ops, + .audio = &wm8775_audio_ops, +}; + +/* ----------------------------------------------------------------------- */ + +/* i2c implementation */ + +/* + * Generic i2c probe + * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1' + */ + +static int wm8775_probe(struct i2c_client *client) +{ + struct wm8775_state *state; + struct v4l2_subdev *sd; + int err; + bool is_nova_s = false; + + if (client->dev.platform_data) { + struct wm8775_platform_data *data = client->dev.platform_data; + is_nova_s = data->is_nova_s; + } + + /* 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%02x (%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, &wm8775_ops); + state->input = 2; + + v4l2_ctrl_handler_init(&state->hdl, 4); + state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops, + V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0); + state->vol = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops, + V4L2_CID_AUDIO_VOLUME, 0, 65535, (65535+99)/100, 0xCF00); /* 0dB*/ + state->bal = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops, + V4L2_CID_AUDIO_BALANCE, 0, 65535, (65535+99)/100, 32768); + state->loud = v4l2_ctrl_new_std(&state->hdl, &wm8775_ctrl_ops, + V4L2_CID_AUDIO_LOUDNESS, 0, 1, 1, 1); + sd->ctrl_handler = &state->hdl; + err = state->hdl.error; + if (err) { + v4l2_ctrl_handler_free(&state->hdl); + return err; + } + + /* Initialize wm8775 */ + + /* RESET */ + wm8775_write(sd, R23, 0x000); + /* Disable zero cross detect timeout */ + wm8775_write(sd, R7, 0x000); + /* HPF enable, left justified, 24-bit (Philips) mode */ + wm8775_write(sd, R11, 0x021); + /* Master mode, clock ratio 256fs */ + wm8775_write(sd, R12, 0x102); + /* Powered up */ + wm8775_write(sd, R13, 0x000); + + if (!is_nova_s) { + /* ADC gain +2.5dB, enable zero cross */ + wm8775_write(sd, R14, 0x1d4); + /* ADC gain +2.5dB, enable zero cross */ + wm8775_write(sd, R15, 0x1d4); + /* ALC Stereo, ALC target level -1dB FS max gain +8dB */ + wm8775_write(sd, R16, 0x1bf); + /* Enable gain control, use zero cross detection, + ALC hold time 42.6 ms */ + wm8775_write(sd, R17, 0x185); + } else { + /* ALC stereo, ALC target level -5dB FS, ALC max gain +8dB */ + wm8775_write(sd, R16, 0x1bb); + /* Set ALC mode and hold time */ + wm8775_write(sd, R17, (state->loud->val ? ALC_EN : 0) | ALC_HOLD); + } + /* ALC gain ramp up delay 34 s, ALC gain ramp down delay 33 ms */ + wm8775_write(sd, R18, 0x0a2); + /* Enable noise gate, threshold -72dBfs */ + wm8775_write(sd, R19, 0x005); + if (!is_nova_s) { + /* Transient window 4ms, lower PGA gain limit -1dB */ + wm8775_write(sd, R20, 0x07a); + /* LRBOTH = 1, use input 2. */ + wm8775_write(sd, R21, 0x102); + } else { + /* Transient window 4ms, ALC min gain -5dB */ + wm8775_write(sd, R20, 0x0fb); + + wm8775_set_audio(sd, 1); /* set volume/mute/mux */ + } + return 0; +} + +static void wm8775_remove(struct i2c_client *client) +{ + struct v4l2_subdev *sd = i2c_get_clientdata(client); + struct wm8775_state *state = to_state(sd); + + v4l2_device_unregister_subdev(sd); + v4l2_ctrl_handler_free(&state->hdl); +} + +static const struct i2c_device_id wm8775_id[] = { + { "wm8775", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, wm8775_id); + +static struct i2c_driver wm8775_driver = { + .driver = { + .name = "wm8775", + }, + .probe = wm8775_probe, + .remove = wm8775_remove, + .id_table = wm8775_id, +}; + +module_i2c_driver(wm8775_driver); |