mirror of https://gitee.com/openkylin/linux.git
[ALSA] ASoC CS4270 codec device driver
This patch adds ALSA SoC support for the Cirrus Logic CS4270 codec. The following features are suppored: 1) Stand-alone and software mode 2) Software mode via I2C only 3) Master mode, not Slave 4) No power management Signed-off-by: Timur Tabi <timur@freescale.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Timur Tabi
Jaroslav Kysela
parent
8259980ebc
commit
b0c813ceee
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@ -120,6 +120,7 @@
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#define I2C_DRIVERID_WM8753 91 /* Wolfson WM8753 audio codec */
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#define I2C_DRIVERID_LM4857 92 /* LM4857 Audio Amplifier */
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#define I2C_DRIVERID_VP27SMPX 93 /* Panasonic VP27s tuner internal MPX */
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#define I2C_DRIVERID_CS4270 94 /* Cirrus Logic 4270 audio codec */
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#define I2C_DRIVERID_I2CDEV 900
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#define I2C_DRIVERID_ARP 902 /* SMBus ARP Client */
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@ -17,3 +17,23 @@ config SND_SOC_WM8753
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config SND_SOC_WM9712
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tristate
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depends on SND_SOC
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# Cirrus Logic CS4270 Codec
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config SND_SOC_CS4270
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tristate
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depends on SND_SOC
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# Cirrus Logic CS4270 Codec Hardware Mute Support
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# Select if you have external muting circuitry attached to your CS4270.
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config SND_SOC_CS4270_HWMUTE
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bool
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depends on SND_SOC_CS4270
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# Cirrus Logic CS4270 Codec VD = 3.3V Errata
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# Select if you are affected by the errata where the part will not function
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# if MCLK divide-by-1.5 is selected and VD is set to 3.3V. The driver will
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# not select any sample rates that require MCLK to be divided by 1.5.
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config SND_SOC_CS4270_VD33_ERRATA
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bool
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depends on SND_SOC_CS4270
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@ -3,9 +3,11 @@ snd-soc-wm8731-objs := wm8731.o
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snd-soc-wm8750-objs := wm8750.o
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snd-soc-wm8753-objs := wm8753.o
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snd-soc-wm9712-objs := wm9712.o
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snd-soc-cs4270-objs := cs4270.o
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obj-$(CONFIG_SND_SOC_AC97_CODEC) += snd-soc-ac97.o
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obj-$(CONFIG_SND_SOC_WM8731) += snd-soc-wm8731.o
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obj-$(CONFIG_SND_SOC_WM8750) += snd-soc-wm8750.o
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obj-$(CONFIG_SND_SOC_WM8753) += snd-soc-wm8753.o
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obj-$(CONFIG_SND_SOC_WM9712) += snd-soc-wm9712.o
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obj-$(CONFIG_SND_SOC_CS4270) += snd-soc-cs4270.o
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@ -0,0 +1,808 @@
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/*
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* CS4270 ALSA SoC (ASoC) codec driver
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*
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* Author: Timur Tabi <timur@freescale.com>
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*
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* Copyright 2007 Freescale Semiconductor, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*
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* This is an ASoC device driver for the Cirrus Logic CS4270 codec.
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*
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* Current features/limitations:
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*
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* 1) Stand-alone and software mode is supported. Stand-alone is
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* automatically selected if I2C is disabled or if a CS4270 is not found
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* on the I2C bus.
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* 2) Only I2C is supported, not SPI
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* 3) Only Master mode is supported, not Slave.
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* 4) The machine driver's 'startup' function must call
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* cs4270_set_dai_sysclk() with the value of MCLK.
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* 5) Only I2S and left-justified modes are supported
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* 6) Power management is not supported
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* 7) The only supported control is volume and hardware mute (if enabled)
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <sound/driver.h>
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#include <sound/core.h>
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#include <sound/soc.h>
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#include <sound/initval.h>
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#include <linux/i2c.h>
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#include "cs4270.h"
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/* Private data for the CS4270 */
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struct cs4270_private {
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unsigned int mclk; /* Input frequency of the MCLK pin */
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unsigned int mode; /* The mode (I2S or left-justified) */
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};
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/*
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* The codec isn't really big-endian or little-endian, since the I2S
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* interface requires data to be sent serially with the MSbit first.
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* However, to support BE and LE I2S devices, we specify both here. That
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* way, ALSA will always match the bit patterns.
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*/
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#define CS4270_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
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SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE | \
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SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S18_3BE | \
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SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S20_3BE | \
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SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE | \
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SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE)
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#ifdef CONFIG_I2C
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/* CS4270 registers addresses */
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#define CS4270_CHIPID 0x01 /* Chip ID */
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#define CS4270_PWRCTL 0x02 /* Power Control */
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#define CS4270_MODE 0x03 /* Mode Control */
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#define CS4270_FORMAT 0x04 /* Serial Format, ADC/DAC Control */
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#define CS4270_TRANS 0x05 /* Transition Control */
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#define CS4270_MUTE 0x06 /* Mute Control */
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#define CS4270_VOLA 0x07 /* DAC Channel A Volume Control */
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#define CS4270_VOLB 0x08 /* DAC Channel B Volume Control */
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#define CS4270_FIRSTREG 0x01
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#define CS4270_LASTREG 0x08
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#define CS4270_NUMREGS (CS4270_LASTREG - CS4270_FIRSTREG + 1)
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/* Bit masks for the CS4270 registers */
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#define CS4270_CHIPID_ID 0xF0
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#define CS4270_CHIPID_REV 0x0F
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#define CS4270_PWRCTL_FREEZE 0x80
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#define CS4270_PWRCTL_PDN_ADC 0x20
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#define CS4270_PWRCTL_PDN_DAC 0x02
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#define CS4270_PWRCTL_PDN 0x01
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#define CS4270_MODE_SPEED_MASK 0x30
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#define CS4270_MODE_1X 0x00
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#define CS4270_MODE_2X 0x10
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#define CS4270_MODE_4X 0x20
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#define CS4270_MODE_SLAVE 0x30
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#define CS4270_MODE_DIV_MASK 0x0E
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#define CS4270_MODE_DIV1 0x00
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#define CS4270_MODE_DIV15 0x02
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#define CS4270_MODE_DIV2 0x04
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#define CS4270_MODE_DIV3 0x06
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#define CS4270_MODE_DIV4 0x08
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#define CS4270_MODE_POPGUARD 0x01
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#define CS4270_FORMAT_FREEZE_A 0x80
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#define CS4270_FORMAT_FREEZE_B 0x40
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#define CS4270_FORMAT_LOOPBACK 0x20
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#define CS4270_FORMAT_DAC_MASK 0x18
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#define CS4270_FORMAT_DAC_LJ 0x00
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#define CS4270_FORMAT_DAC_I2S 0x08
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#define CS4270_FORMAT_DAC_RJ16 0x18
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#define CS4270_FORMAT_DAC_RJ24 0x10
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#define CS4270_FORMAT_ADC_MASK 0x01
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#define CS4270_FORMAT_ADC_LJ 0x00
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#define CS4270_FORMAT_ADC_I2S 0x01
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#define CS4270_TRANS_ONE_VOL 0x80
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#define CS4270_TRANS_SOFT 0x40
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#define CS4270_TRANS_ZERO 0x20
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#define CS4270_TRANS_INV_ADC_A 0x08
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#define CS4270_TRANS_INV_ADC_B 0x10
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#define CS4270_TRANS_INV_DAC_A 0x02
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#define CS4270_TRANS_INV_DAC_B 0x04
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#define CS4270_TRANS_DEEMPH 0x01
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#define CS4270_MUTE_AUTO 0x20
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#define CS4270_MUTE_ADC_A 0x08
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#define CS4270_MUTE_ADC_B 0x10
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#define CS4270_MUTE_POLARITY 0x04
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#define CS4270_MUTE_DAC_A 0x01
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#define CS4270_MUTE_DAC_B 0x02
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/*
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* A list of addresses on which this CS4270 could use. I2C addresses are
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* 7 bits. For the CS4270, the upper four bits are always 1001, and the
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* lower three bits are determined via the AD2, AD1, and AD0 pins
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* (respectively).
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*/
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static unsigned short normal_i2c[] = {
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0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, I2C_CLIENT_END
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};
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I2C_CLIENT_INSMOD;
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/*
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* Pre-fill the CS4270 register cache.
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*
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* We use the auto-increment feature of the CS4270 to read all registers in
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* one shot.
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*/
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static int cs4270_fill_cache(struct snd_soc_codec *codec)
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{
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u8 *cache = codec->reg_cache;
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struct i2c_client *i2c_client = codec->control_data;
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s32 length;
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length = i2c_smbus_read_i2c_block_data(i2c_client,
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CS4270_FIRSTREG | 0x80, CS4270_NUMREGS, cache);
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if (length != CS4270_NUMREGS) {
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printk(KERN_ERR "cs4270: I2C read failure, addr=%u\n",
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i2c_client->addr);
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return -EIO;
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}
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return 0;
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}
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/*
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* Read from the CS4270 register cache.
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*
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* This CS4270 registers are cached to avoid excessive I2C I/O operations.
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* After the initial read to pre-fill the cache, the CS4270 never updates
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* the register values, so we won't have a cache coherncy problem.
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*/
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static unsigned int cs4270_read_reg_cache(struct snd_soc_codec *codec,
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unsigned int reg)
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{
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u8 *cache = codec->reg_cache;
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if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG))
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return -EIO;
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return cache[reg - CS4270_FIRSTREG];
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}
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/*
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* Write to a CS4270 register via the I2C bus.
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*
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* This function writes the given value to the given CS4270 register, and
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* also updates the register cache.
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*
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* Note that we don't use the hw_write function pointer of snd_soc_codec.
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* That's because it's too clunky: the hw_write_t prototype does not match
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* i2c_smbus_write_byte_data(), and it's just another layer of overhead.
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*/
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static int cs4270_i2c_write(struct snd_soc_codec *codec, unsigned int reg,
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unsigned int value)
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{
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if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG))
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return -EIO;
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if (i2c_smbus_write_byte_data(codec->control_data, reg, value) == 0) {
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/* We've written to the hardware, so update the cache */
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u8 *cache = codec->reg_cache;
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cache[reg - CS4270_FIRSTREG] = value;
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return 0;
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} else {
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printk(KERN_ERR "cs4270: I2C write failed\n");
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return -EIO;
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}
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}
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/*
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* Clock Ratio Selection for Master Mode.
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*
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* The data for this chart is taken from Table 5 of the CS4270 reference
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* manual.
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*
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* This table is used to determine how to program the Mode Control register.
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* It is also used by cs4270_set_dai_sysclk() to tell ALSA which sampling
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* rates the CS4270 currently supports.
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*
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* 'ratio' is the MCLK/LRCK ratio. MCLK is usually a fixed input frequency,
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* and LRCK is equal to the sampling rate. The CS4270 only supports sampling
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* rates where this ratio is one of: 64, 96, 128, 192, 256, 384, 512, 768 or
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* 1024.
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*
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* 'speed_mode' is the corresponding bit pattern to be written to the
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* MODE bits of the Mode Control Register
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*
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* 'mclk' is the corresponding bit pattern to be wirten to the MCLK bits of
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* the Mode Control Register.
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*
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* In situations where a single ratio is represented by multiple speed
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* modes, we favor the slowest speed. E.g, for a ratio of 128, we pick
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* double-speed instead of quad-speed. However, the CS4270 errata states
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* that Divide-By-1.5 can cause failures, so we avoid that mode where
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* possible.
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*
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* ERRATA: There is an errata for the CS4270 where divide-by-1.5 does not
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* work if VD = 3.3V. If this effects you, select the
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* CONFIG_SND_SOC_CS4270_VD33_ERRATA Kconfig option, and the driver will
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* never select any sample rates that require divide-by-1.5.
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*/
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static struct {
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unsigned int ratio;
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u8 speed_mode;
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u8 mclk;
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} cs4270_mode_ratios[] = {
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{64, CS4270_MODE_4X, CS4270_MODE_DIV1},
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#ifndef CONFIG_SND_SOC_CS4270_VD33_ERRATA
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{96, CS4270_MODE_4X, CS4270_MODE_DIV15},
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#endif
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{128, CS4270_MODE_2X, CS4270_MODE_DIV1},
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{192, CS4270_MODE_4X, CS4270_MODE_DIV3},
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{256, CS4270_MODE_1X, CS4270_MODE_DIV1},
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{384, CS4270_MODE_2X, CS4270_MODE_DIV3},
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{512, CS4270_MODE_1X, CS4270_MODE_DIV2},
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{768, CS4270_MODE_1X, CS4270_MODE_DIV3},
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{1024, CS4270_MODE_1X, CS4270_MODE_DIV4}
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};
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/*
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* Program the CS4270 with the given hardware parameters.
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*
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* The .dai_ops functions are used to provide board-specific data, like
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* input frequencies, to this driver. This function takes that information,
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* combines it with the hardware parameters provided, and programs the
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* hardware accordingly.
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*/
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static int cs4270_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_soc_device *socdev = rtd->socdev;
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struct snd_soc_codec *codec = socdev->codec;
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struct cs4270_private *cs4270 = codec->private_data;
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unsigned int ret = 0;
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unsigned int i;
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unsigned int rate;
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unsigned int ratio;
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int reg;
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/* Figure out which MCLK/LRCK ratio to use */
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rate = params_rate(params); /* Sampling rate, in Hz */
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ratio = cs4270->mclk / rate; /* MCLK/LRCK ratio */
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for (i = 0; i < ARRAY_SIZE(cs4270_mode_ratios); i++) {
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if (cs4270_mode_ratios[i].ratio == ratio)
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break;
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}
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if (i == ARRAY_SIZE(cs4270_mode_ratios)) {
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/* We did not find a matching ratio */
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printk(KERN_ERR "cs4270: could not find matching ratio\n");
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return -EINVAL;
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}
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/* Freeze and power-down the codec */
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ret = snd_soc_write(codec, CS4270_PWRCTL, CS4270_PWRCTL_FREEZE |
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CS4270_PWRCTL_PDN_ADC | CS4270_PWRCTL_PDN_DAC |
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CS4270_PWRCTL_PDN);
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if (ret < 0) {
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printk(KERN_ERR "cs4270: I2C write failed\n");
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return ret;
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}
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/* Program the mode control register */
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reg = snd_soc_read(codec, CS4270_MODE);
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reg &= ~(CS4270_MODE_SPEED_MASK | CS4270_MODE_DIV_MASK);
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reg |= cs4270_mode_ratios[i].speed_mode | cs4270_mode_ratios[i].mclk;
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ret = snd_soc_write(codec, CS4270_MODE, reg);
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if (ret < 0) {
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printk(KERN_ERR "cs4270: I2C write failed\n");
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return ret;
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}
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/* Program the format register */
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reg = snd_soc_read(codec, CS4270_FORMAT);
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reg &= ~(CS4270_FORMAT_DAC_MASK | CS4270_FORMAT_ADC_MASK);
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switch (cs4270->mode) {
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case SND_SOC_DAIFMT_I2S:
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reg |= CS4270_FORMAT_DAC_I2S | CS4270_FORMAT_ADC_I2S;
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break;
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case SND_SOC_DAIFMT_LEFT_J:
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reg |= CS4270_FORMAT_DAC_LJ | CS4270_FORMAT_ADC_LJ;
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break;
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default:
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printk(KERN_ERR "cs4270: unknown format\n");
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return -EINVAL;
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}
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ret = snd_soc_write(codec, CS4270_FORMAT, reg);
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if (ret < 0) {
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printk(KERN_ERR "cs4270: I2C write failed\n");
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return ret;
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}
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/* Disable auto-mute. This feature appears to be buggy, because in
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some situations, auto-mute will not deactivate when it should. */
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reg = snd_soc_read(codec, CS4270_MUTE);
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reg &= ~CS4270_MUTE_AUTO;
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ret = snd_soc_write(codec, CS4270_MUTE, reg);
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if (ret < 0) {
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printk(KERN_ERR "cs4270: I2C write failed\n");
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return ret;
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}
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/* Thaw and power-up the codec */
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ret = snd_soc_write(codec, CS4270_PWRCTL, 0);
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if (ret < 0) {
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printk(KERN_ERR "cs4270: I2C write failed\n");
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return ret;
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}
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return ret;
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}
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#ifdef CONFIG_SND_SOC_CS4270_HWMUTE
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/*
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* Set the CS4270 external mute
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*
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* This function toggles the mute bits in the MUTE register. The CS4270's
|
||||
* mute capability is intended for external muting circuitry, so if the
|
||||
* board does not have the MUTEA or MUTEB pins connected to such circuitry,
|
||||
* then this function will do nothing.
|
||||
*/
|
||||
static int cs4270_mute(struct snd_soc_codec_dai *dai, int mute)
|
||||
{
|
||||
struct snd_soc_codec *codec = dai->codec;
|
||||
int reg6;
|
||||
|
||||
reg6 = snd_soc_read(codec, CS4270_MUTE);
|
||||
|
||||
if (mute)
|
||||
reg6 |= CS4270_MUTE_ADC_A | CS4270_MUTE_ADC_B |
|
||||
CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B;
|
||||
else
|
||||
reg6 &= ~(CS4270_MUTE_ADC_A | CS4270_MUTE_ADC_B |
|
||||
CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B);
|
||||
|
||||
return snd_soc_write(codec, CS4270_MUTE, reg6);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Sampling rate <-> bit patter mapping
|
||||
*
|
||||
* This array maps sampling rates to their SNDRV_PCM_RATE_x equivalent.
|
||||
*
|
||||
* This is really something that ALSA should provide.
|
||||
*
|
||||
* This table is used by cs4270_set_dai_sysclk() to tell ALSA which sampling
|
||||
* rates the CS4270 currently supports.
|
||||
*/
|
||||
static struct {
|
||||
unsigned int rate;
|
||||
unsigned int bit;
|
||||
} rate_map[] = {
|
||||
{5512, SNDRV_PCM_RATE_5512},
|
||||
{8000, SNDRV_PCM_RATE_8000},
|
||||
{11025, SNDRV_PCM_RATE_11025},
|
||||
{16000, SNDRV_PCM_RATE_16000},
|
||||
{22050, SNDRV_PCM_RATE_22050},
|
||||
{32000, SNDRV_PCM_RATE_32000},
|
||||
{44100, SNDRV_PCM_RATE_44100},
|
||||
{48000, SNDRV_PCM_RATE_48000},
|
||||
{64000, SNDRV_PCM_RATE_64000},
|
||||
{88200, SNDRV_PCM_RATE_88200},
|
||||
{96000, SNDRV_PCM_RATE_96000},
|
||||
{176400, SNDRV_PCM_RATE_176400},
|
||||
{192000, SNDRV_PCM_RATE_192000}
|
||||
};
|
||||
|
||||
/*
|
||||
* Determine the CS4270 samples rates.
|
||||
*
|
||||
* 'freq' is the input frequency to MCLK. The other parameters are ignored.
|
||||
*
|
||||
* The value of MCLK is used to determine which sample rates are supported
|
||||
* by the CS4270. The ratio of MCLK / Fs must be equal to one of nine
|
||||
* support values: 64, 96, 128, 192, 256, 384, 512, 768, and 1024.
|
||||
*
|
||||
* This function calculates the nine ratios and determines which ones match
|
||||
* a standard sample rate. If there's a match, then it is added to the list
|
||||
* of support sample rates.
|
||||
*
|
||||
* This function must be called by the machine driver's 'startup' function,
|
||||
* otherwise the list of supported sample rates will not be available in
|
||||
* time for ALSA.
|
||||
*/
|
||||
static int cs4270_set_dai_sysclk(struct snd_soc_codec_dai *codec_dai,
|
||||
int clk_id, unsigned int freq, int dir)
|
||||
{
|
||||
struct snd_soc_codec *codec = codec_dai->codec;
|
||||
struct cs4270_private *cs4270 = codec->private_data;
|
||||
unsigned int rates = 0;
|
||||
unsigned int rate_min = -1;
|
||||
unsigned int rate_max = 0;
|
||||
unsigned int i;
|
||||
|
||||
cs4270->mclk = freq;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(cs4270_mode_ratios); i++) {
|
||||
unsigned int rate;
|
||||
unsigned int j;
|
||||
rate = freq / cs4270_mode_ratios[i].ratio;
|
||||
for (j = 0; j < ARRAY_SIZE(rate_map); j++) {
|
||||
if (rate == rate_map[j].rate) {
|
||||
rates |= rate_map[j].bit;
|
||||
if (rate < rate_min)
|
||||
rate_min = rate;
|
||||
if (rate > rate_max)
|
||||
rate_max = rate;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (!rate_max) {
|
||||
printk(KERN_ERR "cs4270: could not find a valid rate\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
codec_dai->playback.rates = rates;
|
||||
codec_dai->playback.rate_min = rate_min;
|
||||
codec_dai->playback.rate_max = rate_max;
|
||||
|
||||
codec_dai->capture.rates = rates;
|
||||
codec_dai->capture.rate_min = rate_min;
|
||||
codec_dai->capture.rate_max = rate_max;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Configure the codec for the selected audio format
|
||||
*
|
||||
* This function takes a bitmask of SND_SOC_DAIFMT_x bits and programs the
|
||||
* codec accordingly.
|
||||
*
|
||||
* Currently, this function only supports SND_SOC_DAIFMT_I2S and
|
||||
* SND_SOC_DAIFMT_LEFT_J. The CS4270 codec also supports right-justified
|
||||
* data for playback only, but ASoC currently does not support different
|
||||
* formats for playback vs. record.
|
||||
*/
|
||||
static int cs4270_set_dai_fmt(struct snd_soc_codec_dai *codec_dai,
|
||||
unsigned int format)
|
||||
{
|
||||
struct snd_soc_codec *codec = codec_dai->codec;
|
||||
struct cs4270_private *cs4270 = codec->private_data;
|
||||
int ret = 0;
|
||||
|
||||
switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
|
||||
case SND_SOC_DAIFMT_I2S:
|
||||
case SND_SOC_DAIFMT_LEFT_J:
|
||||
cs4270->mode = format & SND_SOC_DAIFMT_FORMAT_MASK;
|
||||
break;
|
||||
default:
|
||||
printk(KERN_ERR "cs4270: invalid DAI format\n");
|
||||
ret = -EINVAL;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int cs4270_i2c_probe(struct i2c_adapter *adap, int addr, int kind);
|
||||
|
||||
/*
|
||||
* Notify the driver that a new I2C bus has been found.
|
||||
*
|
||||
* This function is called for each I2C bus in the system. The function
|
||||
* then asks the I2C subsystem to probe that bus at the addresses on which
|
||||
* our device (the CS4270) could exist. If a device is found at one of
|
||||
* those addresses, then our probe function (cs4270_i2c_probe) is called.
|
||||
*/
|
||||
static int cs4270_i2c_attach(struct i2c_adapter *adapter)
|
||||
{
|
||||
return i2c_probe(adapter, &addr_data, cs4270_i2c_probe);
|
||||
}
|
||||
|
||||
static int cs4270_i2c_detach(struct i2c_client *client)
|
||||
{
|
||||
struct snd_soc_codec *codec = i2c_get_clientdata(client);
|
||||
|
||||
i2c_detach_client(client);
|
||||
codec->control_data = NULL;
|
||||
|
||||
kfree(codec->reg_cache);
|
||||
codec->reg_cache = NULL;
|
||||
|
||||
kfree(client);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* A list of non-DAPM controls that the CS4270 supports */
|
||||
static const struct snd_kcontrol_new cs4270_snd_controls[] = {
|
||||
SOC_DOUBLE_R("Master Playback Volume",
|
||||
CS4270_VOLA, CS4270_VOLB, 0, 0xFF, 0)
|
||||
};
|
||||
|
||||
static struct i2c_driver cs4270_i2c_driver = {
|
||||
.driver = {
|
||||
.name = "CS4270 I2C",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.id = I2C_DRIVERID_CS4270,
|
||||
.attach_adapter = cs4270_i2c_attach,
|
||||
.detach_client = cs4270_i2c_detach,
|
||||
};
|
||||
|
||||
/*
|
||||
* Global variable to store socdev for i2c probe function.
|
||||
*
|
||||
* If struct i2c_driver had a private_data field, we wouldn't need to use
|
||||
* cs4270_socdec. This is the only way to pass the socdev structure to
|
||||
* cs4270_i2c_probe().
|
||||
*
|
||||
* The real solution to cs4270_socdev is to create a mechanism
|
||||
* that maps I2C addresses to snd_soc_device structures. Perhaps the
|
||||
* creation of the snd_soc_device object should be moved out of
|
||||
* cs4270_probe() and into cs4270_i2c_probe(), but that would make this
|
||||
* driver dependent on I2C. The CS4270 supports "stand-alone" mode, whereby
|
||||
* the chip is *not* connected to the I2C bus, but is instead configured via
|
||||
* input pins.
|
||||
*/
|
||||
static struct snd_soc_device *cs4270_socdev;
|
||||
|
||||
/*
|
||||
* Initialize the I2C interface of the CS4270
|
||||
*
|
||||
* This function is called for whenever the I2C subsystem finds a device
|
||||
* at a particular address.
|
||||
*
|
||||
* Note: snd_soc_new_pcms() must be called before this function can be called,
|
||||
* because of snd_ctl_add().
|
||||
*/
|
||||
static int cs4270_i2c_probe(struct i2c_adapter *adapter, int addr, int kind)
|
||||
{
|
||||
struct snd_soc_device *socdev = cs4270_socdev;
|
||||
struct snd_soc_codec *codec = socdev->codec;
|
||||
struct i2c_client *i2c_client = NULL;
|
||||
int i;
|
||||
int ret = 0;
|
||||
|
||||
/* Probing all possible addresses has one drawback: if there are
|
||||
multiple CS4270s on the bus, then you cannot specify which
|
||||
socdev is matched with which CS4270. For now, we just reject
|
||||
this I2C device if the socdev already has one attached. */
|
||||
if (codec->control_data)
|
||||
return -ENODEV;
|
||||
|
||||
/* Note: codec_dai->codec is NULL here */
|
||||
|
||||
i2c_client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
|
||||
if (!i2c_client) {
|
||||
printk(KERN_ERR "cs4270: could not allocate I2C client\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
codec->reg_cache = kzalloc(CS4270_NUMREGS, GFP_KERNEL);
|
||||
if (!codec->reg_cache) {
|
||||
printk(KERN_ERR "cs4270: could not allocate register cache\n");
|
||||
ret = -ENOMEM;
|
||||
goto error;
|
||||
}
|
||||
|
||||
i2c_set_clientdata(i2c_client, codec);
|
||||
strcpy(i2c_client->name, "CS4270");
|
||||
|
||||
i2c_client->driver = &cs4270_i2c_driver;
|
||||
i2c_client->adapter = adapter;
|
||||
i2c_client->addr = addr;
|
||||
|
||||
/* Verify that we have a CS4270 */
|
||||
|
||||
ret = i2c_smbus_read_byte_data(i2c_client, CS4270_CHIPID);
|
||||
if (ret < 0) {
|
||||
printk(KERN_ERR "cs4270: failed to read I2C\n");
|
||||
goto error;
|
||||
}
|
||||
/* The top four bits of the chip ID should be 1100. */
|
||||
if ((ret & 0xF0) != 0xC0) {
|
||||
/* The device at this address is not a CS4270 codec */
|
||||
ret = -ENODEV;
|
||||
goto error;
|
||||
}
|
||||
|
||||
printk(KERN_INFO "cs4270: found device at I2C address %X\n", addr);
|
||||
printk(KERN_INFO "cs4270: hardware revision %X\n", ret & 0xF);
|
||||
|
||||
/* Tell the I2C layer a new client has arrived */
|
||||
|
||||
ret = i2c_attach_client(i2c_client);
|
||||
if (ret) {
|
||||
printk(KERN_ERR "cs4270: could not attach codec, "
|
||||
"I2C address %x, error code %i\n", addr, ret);
|
||||
goto error;
|
||||
}
|
||||
|
||||
codec->control_data = i2c_client;
|
||||
codec->read = cs4270_read_reg_cache;
|
||||
codec->write = cs4270_i2c_write;
|
||||
codec->reg_cache_size = CS4270_NUMREGS;
|
||||
|
||||
/* The I2C interface is set up, so pre-fill our register cache */
|
||||
|
||||
ret = cs4270_fill_cache(codec);
|
||||
if (ret < 0) {
|
||||
printk(KERN_ERR "cs4270: failed to fill register cache\n");
|
||||
goto error;
|
||||
}
|
||||
|
||||
/* Add the non-DAPM controls */
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(cs4270_snd_controls); i++) {
|
||||
struct snd_kcontrol *kctrl =
|
||||
snd_soc_cnew(&cs4270_snd_controls[i], codec, NULL);
|
||||
|
||||
ret = snd_ctl_add(codec->card, kctrl);
|
||||
if (ret < 0)
|
||||
goto error;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
error:
|
||||
if (codec->control_data) {
|
||||
i2c_detach_client(i2c_client);
|
||||
codec->control_data = NULL;
|
||||
}
|
||||
|
||||
kfree(codec->reg_cache);
|
||||
codec->reg_cache = NULL;
|
||||
codec->reg_cache_size = 0;
|
||||
|
||||
kfree(i2c_client);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
struct snd_soc_codec_dai cs4270_dai = {
|
||||
.name = "CS4270",
|
||||
.playback = {
|
||||
.stream_name = "Playback",
|
||||
.channels_min = 1,
|
||||
.channels_max = 2,
|
||||
.rates = 0,
|
||||
.formats = CS4270_FORMATS,
|
||||
},
|
||||
.capture = {
|
||||
.stream_name = "Capture",
|
||||
.channels_min = 1,
|
||||
.channels_max = 2,
|
||||
.rates = 0,
|
||||
.formats = CS4270_FORMATS,
|
||||
},
|
||||
.dai_ops = {
|
||||
.set_sysclk = cs4270_set_dai_sysclk,
|
||||
.set_fmt = cs4270_set_dai_fmt,
|
||||
}
|
||||
};
|
||||
EXPORT_SYMBOL_GPL(cs4270_dai);
|
||||
|
||||
/*
|
||||
* ASoC probe function
|
||||
*
|
||||
* This function is called when the machine driver calls
|
||||
* platform_device_add().
|
||||
*/
|
||||
static int cs4270_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
|
||||
struct snd_soc_codec *codec;
|
||||
int ret = 0;
|
||||
|
||||
printk(KERN_INFO "CS4270 ALSA SoC Codec\n");
|
||||
|
||||
/* Allocate enough space for the snd_soc_codec structure
|
||||
and our private data together. */
|
||||
codec = kzalloc(ALIGN(sizeof(struct snd_soc_codec), 4) +
|
||||
sizeof(struct cs4270_private), GFP_KERNEL);
|
||||
if (!codec) {
|
||||
printk(KERN_ERR "cs4270: Could not allocate codec structure\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
mutex_init(&codec->mutex);
|
||||
INIT_LIST_HEAD(&codec->dapm_widgets);
|
||||
INIT_LIST_HEAD(&codec->dapm_paths);
|
||||
|
||||
codec->name = "CS4270";
|
||||
codec->owner = THIS_MODULE;
|
||||
codec->dai = &cs4270_dai;
|
||||
codec->num_dai = 1;
|
||||
codec->private_data = codec + ALIGN(sizeof(struct snd_soc_codec), 4);
|
||||
|
||||
socdev->codec = codec;
|
||||
|
||||
/* Register PCMs */
|
||||
|
||||
ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
|
||||
if (ret < 0) {
|
||||
printk(KERN_ERR "cs4270: failed to create PCMs\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_I2C
|
||||
cs4270_socdev = socdev;
|
||||
|
||||
ret = i2c_add_driver(&cs4270_i2c_driver);
|
||||
if (ret) {
|
||||
printk(KERN_ERR "cs4270: failed to attach driver");
|
||||
snd_soc_free_pcms(socdev);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* Did we find a CS4270 on the I2C bus? */
|
||||
if (codec->control_data) {
|
||||
/* Initialize codec ops */
|
||||
cs4270_dai.ops.hw_params = cs4270_hw_params;
|
||||
#ifdef CONFIG_SND_SOC_CS4270_HWMUTE
|
||||
cs4270_dai.dai_ops.digital_mute = cs4270_mute;
|
||||
#endif
|
||||
} else
|
||||
printk(KERN_INFO "cs4270: no I2C device found, "
|
||||
"using stand-alone mode\n");
|
||||
#else
|
||||
printk(KERN_INFO "cs4270: I2C disabled, using stand-alone mode\n");
|
||||
#endif
|
||||
|
||||
ret = snd_soc_register_card(socdev);
|
||||
if (ret < 0) {
|
||||
printk(KERN_ERR "cs4270: failed to register card\n");
|
||||
snd_soc_free_pcms(socdev);
|
||||
return ret;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int cs4270_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
|
||||
|
||||
snd_soc_free_pcms(socdev);
|
||||
|
||||
#ifdef CONFIG_I2C
|
||||
if (socdev->codec->control_data)
|
||||
i2c_del_driver(&cs4270_i2c_driver);
|
||||
#endif
|
||||
|
||||
kfree(socdev->codec);
|
||||
socdev->codec = NULL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* ASoC codec device structure
|
||||
*
|
||||
* Assign this variable to the codec_dev field of the machine driver's
|
||||
* snd_soc_device structure.
|
||||
*/
|
||||
struct snd_soc_codec_device soc_codec_device_cs4270 = {
|
||||
.probe = cs4270_probe,
|
||||
.remove = cs4270_remove
|
||||
};
|
||||
EXPORT_SYMBOL_GPL(soc_codec_device_cs4270);
|
||||
|
||||
MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
|
||||
MODULE_DESCRIPTION("Cirrus Logic CS4270 ALSA SoC Codec Driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
@ -0,0 +1,28 @@
|
|||
/*
|
||||
* Cirrus Logic CS4270 ALSA SoC Codec Driver
|
||||
*
|
||||
* Author: Timur Tabi <timur@freescale.com>
|
||||
*
|
||||
* Copyright 2007 Freescale Semiconductor, Inc. This file is licensed under
|
||||
* the terms of the GNU General Public License version 2. This program
|
||||
* is licensed "as is" without any warranty of any kind, whether express
|
||||
* or implied.
|
||||
*/
|
||||
|
||||
#ifndef _CS4270_H
|
||||
#define _CS4270_H
|
||||
|
||||
/*
|
||||
* The ASoC codec DAI structure for the CS4270. Assign this structure to
|
||||
* the .codec_dai field of your machine driver's snd_soc_dai_link structure.
|
||||
*/
|
||||
extern struct snd_soc_codec_dai cs4270_dai;
|
||||
|
||||
/*
|
||||
* The ASoC codec device structure for the CS4270. Assign this structure
|
||||
* to the .codec_dev field of your machine driver's snd_soc_device
|
||||
* structure.
|
||||
*/
|
||||
extern struct snd_soc_codec_device soc_codec_device_cs4270;
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue