// SPDX-License-Identifier: GPL-2.0-or-later /* * wm8739 * * Copyright (C) 2005 T. Adachi * * Copyright (C) 2005 Hans Verkuil * - Cleanup */ #include #include #include #include #include #include #include #include #include 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) { 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 void 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); } static const struct i2c_device_id wm8739_id[] = { { "wm8739" }, { } }; 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);