diff options
Diffstat (limited to 'sound/soc/codecs/lm4857.c')
| -rw-r--r-- | sound/soc/codecs/lm4857.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/sound/soc/codecs/lm4857.c b/sound/soc/codecs/lm4857.c new file mode 100644 index 00000000000..314379706e3 --- /dev/null +++ b/sound/soc/codecs/lm4857.c @@ -0,0 +1,224 @@ +/* + * LM4857 AMP driver + * + * Copyright 2007 Wolfson Microelectronics PLC. + * Author: Graeme Gregory + * graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com + * + * 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. + * + */ + +#include <linux/module.h> +#include <linux/i2c.h> + +#include <sound/core.h> +#include <sound/soc.h> +#include <sound/soc-dapm.h> + +#include "lm4857.h" + +static struct { + struct i2c_client *i2c; + uint8_t regs[4]; + uint8_t state; +} lm4857 = { + .regs = {0x00, 0x40, 0x80, 0xC0}, +}; + +static void lm4857_write_regs(void) +{ + if (!lm4857.i2c) + return; + + if (i2c_master_send(lm4857.i2c, lm4857.regs, 4) != 4) + dev_err(&lm4857_i2c->dev, "lm4857: i2c write failed\n"); +} + +static int lm4857_get_reg(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct soc_mixer_control *mc = + (struct soc_mixer_control *)kcontrol->private_value; + int reg = mc->reg; + int shift = mc->shift; + int mask = mc->max; + + ucontrol->value.integer.value[0] = (lm4857.regs[reg] >> shift) & mask; + return 0; +} + +static int lm4857_set_reg(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct soc_mixer_control *mc = + (struct soc_mixer_control *)kcontrol->private_value; + int reg = mc->reg; + int shift = mc->shift; + int mask = mc->max; + + if (((lm4857.regs[reg] >> shift) & mask) == + ucontrol->value.integer.value[0]) + return 0; + + lm4857.regs[reg] &= ~(mask << shift); + lm4857.regs[reg] |= ucontrol->value.integer.value[0] << shift; + + lm4857_write_regs(); + + return 1; +} + +static int lm4857_get_mode(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + uint8_t value = lm4857.regs[LM4857_CTRL] & 0x0F; + + if (value) + value -= 5; + + ucontrol->value.integer.value[0] = value; + + return 0; +} + +static int lm4857_set_mode(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + uint8_t value = ucontrol->value.integer.value[0]; + + if (value) + value += 5; + + if ((lm4857.regs[LM4857_CTRL] & 0x0F) == value) + return 0; + + lm4857.regs[LM4857_CTRL] &= 0xF0; + lm4857.regs[LM4857_CTRL] |= value; + lm4857_write_regs(); + return 1; +} + +static const char *lm4857_mode[] = { + "Off", + "Call Speaker", + "Stereo Speakers", + "Stereo Speakers + Headphones", + "Headphones" +}; + +static const struct soc_enum lm4857_mode_enum[] = { + SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(lm4857_mode), lm4857_mode), +}; + +static const DECLARE_TLV_DB_SCALE(stereo_tlv, -4050, 150, 0); +static const DECLARE_TLV_DB_SCALE(mono_tlv, -3450, 150, 0); + +static const struct snd_kcontrol_new lm4857_controls[] = { + SOC_SINGLE_EXT_TLV("Amp Left Playback Volume", LM4857_LVOL, 0, 31, 0, + lm4857_get_reg, lm4857_set_reg, stereo_tlv), + SOC_SINGLE_EXT_TLV("Amp Right Playback Volume", LM4857_RVOL, 0, 31, 0, + lm4857_get_reg, lm4857_set_reg, stereo_tlv), + SOC_SINGLE_EXT_TLV("Amp Mono Playback Volume", LM4857_MVOL, 0, 31, 0, + lm4857_get_reg, lm4857_set_reg, mono_tlv), + SOC_ENUM_EXT("Amp Mode", lm4857_mode_enum[0], + lm4857_get_mode, lm4857_set_mode), + SOC_SINGLE_EXT("Amp Spk 3D Playback Switch", LM4857_LVOL, 5, 1, 0, + lm4857_get_reg, lm4857_set_reg), + SOC_SINGLE_EXT("Amp HP 3d Playback Switch", LM4857_RVOL, 5, 1, 0, + lm4857_get_reg, lm4857_set_reg), + SOC_SINGLE_EXT("Amp Fast Wakeup Playback Switch", LM4857_CTRL, 5, 1, 0, + lm4857_get_reg, lm4857_set_reg), + SOC_SINGLE_EXT("Amp Earpiece 6dB Playback Switch", LM4857_CTRL, 4, 1, 0, + lm4857_get_reg, lm4857_set_reg), +}; + +int lm4857_add_controls(struct snd_soc_codec *codec) +{ + return snd_soc_add_controls(codec, lm4857_controls, + ARRAY_SIZE(lm5857_controls)); +} +EXPORT_GPL(lm4857_add_controlls); + +static int __devinit lm4857_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + lm4857.i2c = client; + lm4857_write_regs(); + return 0; +} + +static int __devexit lm4857_remove(struct i2c_client *client) +{ + lm4857.i2c = NULL; + return 0; +} + +static void lm4857_shutdown(struct i2c_client *client) +{ + lm4857_regs[LM4857_CTRL] &= 0xf0; + lm4857_write_regs(); +} + +#ifdef CONFIG_PM + +static int lm4857_suspend(struct i2c_client *client, pm_message_t state) +{ + lm4857.state = lm4857_regs[LM4857_CTRL] & 0xf; + + if (lm4857.state) + lm4857_shutdown(client); + + return 0; +} + +static int lm4857_resume(struct i2c_client *dev) +{ + if (lm4857.state) { + lm4857_regs[LM4857_CTRL] |= (lm4857.state & 0x0f); + lm4857_write_regs(); + } + return 0; +} + +#else +#define lm4857_suspend NULL +#define lm4857_resume NULL +#endif + +static const struct i2c_device_id lm4857_i2c_id[] = { + { "lm4857", 0 }, + { } +}; + +static struct i2c_driver lm4857_i2c_driver = { + .driver = { + .name = "LM4857 I2C Amp", + .owner = THIS_MODULE, + }, + .probe = lm4857_probe, + .remove = __devexit_p(lm4857_remove), + .suspend = lm4857_suspend, + .resume = lm4857_resume, + .shutdown = lm4857_shutdown, + .id_table = lm4857_i2c_id, +}; + +static int __init lm4857_init(void) +{ + return i2c_add_driver(&lm4857_i2c_driver); +} +module_init(lm4857_init); + +static void __exit lm4857_exit(void) +{ + i2c_del_driver(&lm4857_i2c_driver); +} +module_exit(lm4857_exit); + +MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); +MODULE_DESCRIPTION("LM4857 amplifier driver"); +MODULE_LICENSE("GPL"); |