/* * 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-device.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 { struct v4l2_subdev sd; 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 inline struct wm8739_state *to_state(struct v4l2_subdev *sd) { return container_of(sd, struct wm8739_state, 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; } /* write regs to set audio volume etc */ static void wm8739_set_audio(struct v4l2_subdev *sd) { struct wm8739_state *state = to_state(sd); 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(sd, R0, (state->vol_l & 0x1f) | mute); wm8739_write(sd, R1, (state->vol_r & 0x1f) | mute); } static int wm8739_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl) { struct wm8739_state *state = to_state(sd); 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_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl) { struct wm8739_state *state = to_state(sd); 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(sd); 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_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_queryctrl(struct v4l2_subdev *sd, struct v4l2_queryctrl *qc) { 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; } static int wm8739_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip) { struct i2c_client *client = v4l2_get_subdevdata(sd); return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_WM8739, 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_info(sd, "Volume L: %02x%s\n", state->vol_l & 0x1f, state->muted ? " (muted)" : ""); v4l2_info(sd, "Volume R: %02x%s\n", state->vol_r & 0x1f, state->muted ? " (muted)" : ""); return 0; } /* ----------------------------------------------------------------------- */ static const struct v4l2_subdev_core_ops wm8739_core_ops = { .log_status = wm8739_log_status, .g_chip_ident = wm8739_g_chip_ident, .queryctrl = wm8739_queryctrl, .g_ctrl = wm8739_g_ctrl, .s_ctrl = wm8739_s_ctrl, }; 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 = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL); if (state == NULL) return -ENOMEM; sd = &state->sd; v4l2_i2c_subdev_init(sd, client, &wm8739_ops); 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; /* 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 */ wm8739_set_audio(sd); return 0; } static int wm8739_remove(struct i2c_client *client) { struct v4l2_subdev *sd = i2c_get_clientdata(client); v4l2_device_unregister_subdev(sd); kfree(to_state(sd)); 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", .probe = wm8739_probe, .remove = wm8739_remove, .id_table = wm8739_id, };