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775 lines
23 KiB
775 lines
23 KiB
/* |
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* CS4270 ALSA SoC (ASoC) codec driver |
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* |
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* Author: Timur Tabi <[email protected]> |
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* |
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* Copyright 2007-2009 Freescale Semiconductor, Inc. This file is licensed |
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* under the terms of the GNU General Public License version 2. This |
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* program is licensed "as is" without any warranty of any kind, whether |
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* express 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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* - Software mode is supported. Stand-alone mode is not supported. |
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* - Only I2C is supported, not SPI |
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* - Support for master and slave mode |
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* - 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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* - Only I2S and left-justified modes are supported |
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* - Power management is supported |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/slab.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 <linux/delay.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/of_device.h> |
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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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|
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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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|
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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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#define CS4270_I2C_INCR 0x80 |
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|
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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_PWRCTL_PDN_ALL \ |
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(CS4270_PWRCTL_PDN_ADC | CS4270_PWRCTL_PDN_DAC | CS4270_PWRCTL_PDN) |
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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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/* Power-on default values for the registers |
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* |
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* This array contains the power-on default values of the registers, with the |
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* exception of the "CHIPID" register (01h). The lower four bits of that |
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* register contain the hardware revision, so it is treated as volatile. |
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*/ |
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static const struct reg_default cs4270_reg_defaults[] = { |
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{ 2, 0x00 }, |
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{ 3, 0x30 }, |
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{ 4, 0x00 }, |
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{ 5, 0x60 }, |
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{ 6, 0x20 }, |
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{ 7, 0x00 }, |
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{ 8, 0x00 }, |
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}; |
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|
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static const char *supply_names[] = { |
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"va", "vd", "vlc" |
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}; |
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/* Private data for the CS4270 */ |
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struct cs4270_private { |
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struct regmap *regmap; |
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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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unsigned int slave_mode; |
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unsigned int manual_mute; |
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|
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/* power domain regulators */ |
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struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)]; |
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|
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/* reset gpio */ |
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struct gpio_desc *reset_gpio; |
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}; |
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static const struct snd_soc_dapm_widget cs4270_dapm_widgets[] = { |
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SND_SOC_DAPM_INPUT("AINL"), |
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SND_SOC_DAPM_INPUT("AINR"), |
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SND_SOC_DAPM_OUTPUT("AOUTL"), |
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SND_SOC_DAPM_OUTPUT("AOUTR"), |
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}; |
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static const struct snd_soc_dapm_route cs4270_dapm_routes[] = { |
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{ "Capture", NULL, "AINL" }, |
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{ "Capture", NULL, "AINR" }, |
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{ "AOUTL", NULL, "Playback" }, |
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{ "AOUTR", NULL, "Playback" }, |
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}; |
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/** |
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* struct cs4270_mode_ratios - clock ratio tables |
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* @ratio: the ratio of MCLK to the sample rate |
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* @speed_mode: the Speed Mode bits to set in the Mode Control register for |
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* this ratio |
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* @mclk: the Ratio Select bits to set in the Mode Control register for this |
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* ratio |
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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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* @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 is 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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struct cs4270_mode_ratios { |
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unsigned int ratio; |
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u8 speed_mode; |
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u8 mclk; |
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}; |
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static struct cs4270_mode_ratios 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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/* The number of MCLK/LRCK ratios supported by the CS4270 */ |
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#define NUM_MCLK_RATIOS ARRAY_SIZE(cs4270_mode_ratios) |
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static bool cs4270_reg_is_readable(struct device *dev, unsigned int reg) |
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{ |
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return (reg >= CS4270_FIRSTREG) && (reg <= CS4270_LASTREG); |
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} |
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static bool cs4270_reg_is_volatile(struct device *dev, unsigned int reg) |
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{ |
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/* Unreadable registers are considered volatile */ |
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if ((reg < CS4270_FIRSTREG) || (reg > CS4270_LASTREG)) |
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return true; |
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return reg == CS4270_CHIPID; |
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} |
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/** |
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* cs4270_set_dai_sysclk - determine the CS4270 samples rates. |
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* @codec_dai: the codec DAI |
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* @clk_id: the clock ID (ignored) |
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* @freq: the MCLK input frequency |
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* @dir: the clock direction (ignored) |
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* |
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* This function is used to tell the codec driver what the input MCLK |
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* frequency is. |
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* |
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* The value of MCLK is used to determine which sample rates are supported |
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* by the CS4270. The ratio of MCLK / Fs must be equal to one of nine |
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* supported values - 64, 96, 128, 192, 256, 384, 512, 768, and 1024. |
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* |
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* This function calculates the nine ratios and determines which ones match |
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* a standard sample rate. If there's a match, then it is added to the list |
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* of supported sample rates. |
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* |
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* This function must be called by the machine driver's 'startup' function, |
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* otherwise the list of supported sample rates will not be available in |
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* time for ALSA. |
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* |
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* For setups with variable MCLKs, pass 0 as 'freq' argument. This will cause |
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* theoretically possible sample rates to be enabled. Call it again with a |
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* proper value set one the external clock is set (most probably you would do |
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* that from a machine's driver 'hw_param' hook. |
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*/ |
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static int cs4270_set_dai_sysclk(struct snd_soc_dai *codec_dai, |
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int clk_id, unsigned int freq, int dir) |
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{ |
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struct snd_soc_component *component = codec_dai->component; |
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struct cs4270_private *cs4270 = snd_soc_component_get_drvdata(component); |
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cs4270->mclk = freq; |
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return 0; |
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} |
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/** |
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* cs4270_set_dai_fmt - configure the codec for the selected audio format |
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* @codec_dai: the codec DAI |
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* @format: a SND_SOC_DAIFMT_x value indicating the data format |
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* |
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* This function takes a bitmask of SND_SOC_DAIFMT_x bits and programs the |
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* codec accordingly. |
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* |
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* Currently, this function only supports SND_SOC_DAIFMT_I2S and |
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* SND_SOC_DAIFMT_LEFT_J. The CS4270 codec also supports right-justified |
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* data for playback only, but ASoC currently does not support different |
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* formats for playback vs. record. |
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*/ |
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static int cs4270_set_dai_fmt(struct snd_soc_dai *codec_dai, |
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unsigned int format) |
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{ |
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struct snd_soc_component *component = codec_dai->component; |
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struct cs4270_private *cs4270 = snd_soc_component_get_drvdata(component); |
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/* set DAI format */ |
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switch (format & SND_SOC_DAIFMT_FORMAT_MASK) { |
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case SND_SOC_DAIFMT_I2S: |
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case SND_SOC_DAIFMT_LEFT_J: |
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cs4270->mode = format & SND_SOC_DAIFMT_FORMAT_MASK; |
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break; |
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default: |
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dev_err(component->dev, "invalid dai format\n"); |
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return -EINVAL; |
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} |
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/* set master/slave audio interface */ |
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switch (format & SND_SOC_DAIFMT_MASTER_MASK) { |
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case SND_SOC_DAIFMT_CBS_CFS: |
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cs4270->slave_mode = 1; |
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break; |
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case SND_SOC_DAIFMT_CBM_CFM: |
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cs4270->slave_mode = 0; |
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break; |
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default: |
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/* all other modes are unsupported by the hardware */ |
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dev_err(component->dev, "Unknown master/slave configuration\n"); |
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return -EINVAL; |
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} |
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return 0; |
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} |
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/** |
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* cs4270_hw_params - program the CS4270 with the given hardware parameters. |
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* @substream: the audio stream |
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* @params: the hardware parameters to set |
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* @dai: the SOC DAI (ignored) |
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* |
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* This function programs the hardware with the values provided. |
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* Specifically, the sample rate and the data format. |
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* |
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* The .ops functions are used to provide board-specific data, like input |
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* 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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struct snd_soc_dai *dai) |
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{ |
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struct snd_soc_component *component = dai->component; |
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struct cs4270_private *cs4270 = snd_soc_component_get_drvdata(component); |
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int ret; |
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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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|
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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 < NUM_MCLK_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 == NUM_MCLK_RATIOS) { |
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/* We did not find a matching ratio */ |
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dev_err(component->dev, "could not find matching ratio\n"); |
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return -EINVAL; |
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} |
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/* Set the sample rate */ |
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reg = snd_soc_component_read(component, CS4270_MODE); |
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reg &= ~(CS4270_MODE_SPEED_MASK | CS4270_MODE_DIV_MASK); |
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reg |= cs4270_mode_ratios[i].mclk; |
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if (cs4270->slave_mode) |
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reg |= CS4270_MODE_SLAVE; |
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else |
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reg |= cs4270_mode_ratios[i].speed_mode; |
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ret = snd_soc_component_write(component, CS4270_MODE, reg); |
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if (ret < 0) { |
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dev_err(component->dev, "i2c write failed\n"); |
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return ret; |
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} |
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/* Set the DAI format */ |
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reg = snd_soc_component_read(component, 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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dev_err(component->dev, "unknown dai format\n"); |
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return -EINVAL; |
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} |
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ret = snd_soc_component_write(component, CS4270_FORMAT, reg); |
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if (ret < 0) { |
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dev_err(component->dev, "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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/** |
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* cs4270_dai_mute - enable/disable the CS4270 external mute |
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* @dai: the SOC DAI |
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* @mute: 0 = disable mute, 1 = enable mute |
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* |
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* This function toggles the mute bits in the MUTE register. The CS4270's |
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* mute capability is intended for external muting circuitry, so if the |
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* board does not have the MUTEA or MUTEB pins connected to such circuitry, |
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* then this function will do nothing. |
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*/ |
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static int cs4270_dai_mute(struct snd_soc_dai *dai, int mute, int direction) |
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{ |
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struct snd_soc_component *component = dai->component; |
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struct cs4270_private *cs4270 = snd_soc_component_get_drvdata(component); |
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int reg6; |
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reg6 = snd_soc_component_read(component, CS4270_MUTE); |
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if (mute) |
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reg6 |= CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B; |
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else { |
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reg6 &= ~(CS4270_MUTE_DAC_A | CS4270_MUTE_DAC_B); |
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reg6 |= cs4270->manual_mute; |
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} |
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return snd_soc_component_write(component, CS4270_MUTE, reg6); |
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} |
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/** |
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* cs4270_soc_put_mute - put callback for the 'Master Playback switch' |
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* alsa control. |
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* @kcontrol: mixer control |
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* @ucontrol: control element information |
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* |
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* This function basically passes the arguments on to the generic |
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* snd_soc_put_volsw() function and saves the mute information in |
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* our private data structure. This is because we want to prevent |
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* cs4270_dai_mute() neglecting the user's decision to manually |
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* mute the codec's output. |
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* |
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* Returns 0 for success. |
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*/ |
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static int cs4270_soc_put_mute(struct snd_kcontrol *kcontrol, |
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struct snd_ctl_elem_value *ucontrol) |
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{ |
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struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol); |
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struct cs4270_private *cs4270 = snd_soc_component_get_drvdata(component); |
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int left = !ucontrol->value.integer.value[0]; |
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int right = !ucontrol->value.integer.value[1]; |
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cs4270->manual_mute = (left ? CS4270_MUTE_DAC_A : 0) | |
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(right ? CS4270_MUTE_DAC_B : 0); |
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return snd_soc_put_volsw(kcontrol, ucontrol); |
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} |
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/* A list of non-DAPM controls that the CS4270 supports */ |
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static const struct snd_kcontrol_new cs4270_snd_controls[] = { |
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SOC_DOUBLE_R("Master Playback Volume", |
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CS4270_VOLA, CS4270_VOLB, 0, 0xFF, 1), |
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SOC_SINGLE("Digital Sidetone Switch", CS4270_FORMAT, 5, 1, 0), |
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SOC_SINGLE("Soft Ramp Switch", CS4270_TRANS, 6, 1, 0), |
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SOC_SINGLE("Zero Cross Switch", CS4270_TRANS, 5, 1, 0), |
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SOC_SINGLE("De-emphasis filter", CS4270_TRANS, 0, 1, 0), |
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SOC_SINGLE("Popguard Switch", CS4270_MODE, 0, 1, 1), |
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SOC_SINGLE("Auto-Mute Switch", CS4270_MUTE, 5, 1, 0), |
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SOC_DOUBLE("Master Capture Switch", CS4270_MUTE, 3, 4, 1, 1), |
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SOC_DOUBLE_EXT("Master Playback Switch", CS4270_MUTE, 0, 1, 1, 1, |
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snd_soc_get_volsw, cs4270_soc_put_mute), |
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}; |
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static const struct snd_soc_dai_ops cs4270_dai_ops = { |
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.hw_params = cs4270_hw_params, |
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.set_sysclk = cs4270_set_dai_sysclk, |
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.set_fmt = cs4270_set_dai_fmt, |
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.mute_stream = cs4270_dai_mute, |
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.no_capture_mute = 1, |
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}; |
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|
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static struct snd_soc_dai_driver cs4270_dai = { |
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.name = "cs4270-hifi", |
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.playback = { |
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.stream_name = "Playback", |
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.channels_min = 2, |
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.channels_max = 2, |
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.rates = SNDRV_PCM_RATE_CONTINUOUS, |
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.rate_min = 4000, |
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.rate_max = 216000, |
|
.formats = CS4270_FORMATS, |
|
}, |
|
.capture = { |
|
.stream_name = "Capture", |
|
.channels_min = 2, |
|
.channels_max = 2, |
|
.rates = SNDRV_PCM_RATE_CONTINUOUS, |
|
.rate_min = 4000, |
|
.rate_max = 216000, |
|
.formats = CS4270_FORMATS, |
|
}, |
|
.ops = &cs4270_dai_ops, |
|
}; |
|
|
|
/** |
|
* cs4270_probe - ASoC probe function |
|
* @component: ASoC component |
|
* |
|
* This function is called when ASoC has all the pieces it needs to |
|
* instantiate a sound driver. |
|
*/ |
|
static int cs4270_probe(struct snd_soc_component *component) |
|
{ |
|
struct cs4270_private *cs4270 = snd_soc_component_get_drvdata(component); |
|
int ret; |
|
|
|
/* Disable auto-mute. This feature appears to be buggy. In some |
|
* situations, auto-mute will not deactivate when it should, so we want |
|
* this feature disabled by default. An application (e.g. alsactl) can |
|
* re-enabled it by using the controls. |
|
*/ |
|
ret = snd_soc_component_update_bits(component, CS4270_MUTE, CS4270_MUTE_AUTO, 0); |
|
if (ret < 0) { |
|
dev_err(component->dev, "i2c write failed\n"); |
|
return ret; |
|
} |
|
|
|
/* Disable automatic volume control. The hardware enables, and it |
|
* causes volume change commands to be delayed, sometimes until after |
|
* playback has started. An application (e.g. alsactl) can |
|
* re-enabled it by using the controls. |
|
*/ |
|
ret = snd_soc_component_update_bits(component, CS4270_TRANS, |
|
CS4270_TRANS_SOFT | CS4270_TRANS_ZERO, 0); |
|
if (ret < 0) { |
|
dev_err(component->dev, "i2c write failed\n"); |
|
return ret; |
|
} |
|
|
|
ret = regulator_bulk_enable(ARRAY_SIZE(cs4270->supplies), |
|
cs4270->supplies); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* cs4270_remove - ASoC remove function |
|
* @component: ASoC component |
|
* |
|
* This function is the counterpart to cs4270_probe(). |
|
*/ |
|
static void cs4270_remove(struct snd_soc_component *component) |
|
{ |
|
struct cs4270_private *cs4270 = snd_soc_component_get_drvdata(component); |
|
|
|
regulator_bulk_disable(ARRAY_SIZE(cs4270->supplies), cs4270->supplies); |
|
}; |
|
|
|
#ifdef CONFIG_PM |
|
|
|
/* This suspend/resume implementation can handle both - a simple standby |
|
* where the codec remains powered, and a full suspend, where the voltage |
|
* domain the codec is connected to is teared down and/or any other hardware |
|
* reset condition is asserted. |
|
* |
|
* The codec's own power saving features are enabled in the suspend callback, |
|
* and all registers are written back to the hardware when resuming. |
|
*/ |
|
|
|
static int cs4270_soc_suspend(struct snd_soc_component *component) |
|
{ |
|
struct cs4270_private *cs4270 = snd_soc_component_get_drvdata(component); |
|
int reg, ret; |
|
|
|
reg = snd_soc_component_read(component, CS4270_PWRCTL) | CS4270_PWRCTL_PDN_ALL; |
|
if (reg < 0) |
|
return reg; |
|
|
|
ret = snd_soc_component_write(component, CS4270_PWRCTL, reg); |
|
if (ret < 0) |
|
return ret; |
|
|
|
regulator_bulk_disable(ARRAY_SIZE(cs4270->supplies), |
|
cs4270->supplies); |
|
|
|
return 0; |
|
} |
|
|
|
static int cs4270_soc_resume(struct snd_soc_component *component) |
|
{ |
|
struct cs4270_private *cs4270 = snd_soc_component_get_drvdata(component); |
|
int reg, ret; |
|
|
|
ret = regulator_bulk_enable(ARRAY_SIZE(cs4270->supplies), |
|
cs4270->supplies); |
|
if (ret != 0) |
|
return ret; |
|
|
|
/* In case the device was put to hard reset during sleep, we need to |
|
* wait 500ns here before any I2C communication. */ |
|
ndelay(500); |
|
|
|
/* first restore the entire register cache ... */ |
|
regcache_sync(cs4270->regmap); |
|
|
|
/* ... then disable the power-down bits */ |
|
reg = snd_soc_component_read(component, CS4270_PWRCTL); |
|
reg &= ~CS4270_PWRCTL_PDN_ALL; |
|
|
|
return snd_soc_component_write(component, CS4270_PWRCTL, reg); |
|
} |
|
#else |
|
#define cs4270_soc_suspend NULL |
|
#define cs4270_soc_resume NULL |
|
#endif /* CONFIG_PM */ |
|
|
|
/* |
|
* ASoC codec driver structure |
|
*/ |
|
static const struct snd_soc_component_driver soc_component_device_cs4270 = { |
|
.probe = cs4270_probe, |
|
.remove = cs4270_remove, |
|
.suspend = cs4270_soc_suspend, |
|
.resume = cs4270_soc_resume, |
|
.controls = cs4270_snd_controls, |
|
.num_controls = ARRAY_SIZE(cs4270_snd_controls), |
|
.dapm_widgets = cs4270_dapm_widgets, |
|
.num_dapm_widgets = ARRAY_SIZE(cs4270_dapm_widgets), |
|
.dapm_routes = cs4270_dapm_routes, |
|
.num_dapm_routes = ARRAY_SIZE(cs4270_dapm_routes), |
|
.idle_bias_on = 1, |
|
.use_pmdown_time = 1, |
|
.endianness = 1, |
|
.non_legacy_dai_naming = 1, |
|
}; |
|
|
|
/* |
|
* cs4270_of_match - the device tree bindings |
|
*/ |
|
static const struct of_device_id cs4270_of_match[] = { |
|
{ .compatible = "cirrus,cs4270", }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, cs4270_of_match); |
|
|
|
static const struct regmap_config cs4270_regmap = { |
|
.reg_bits = 8, |
|
.val_bits = 8, |
|
.max_register = CS4270_LASTREG, |
|
.reg_defaults = cs4270_reg_defaults, |
|
.num_reg_defaults = ARRAY_SIZE(cs4270_reg_defaults), |
|
.cache_type = REGCACHE_RBTREE, |
|
.write_flag_mask = CS4270_I2C_INCR, |
|
|
|
.readable_reg = cs4270_reg_is_readable, |
|
.volatile_reg = cs4270_reg_is_volatile, |
|
}; |
|
|
|
/** |
|
* cs4270_i2c_remove - deinitialize the I2C interface of the CS4270 |
|
* @i2c_client: the I2C client object |
|
* |
|
* This function puts the chip into low power mode when the i2c device |
|
* is removed. |
|
*/ |
|
static int cs4270_i2c_remove(struct i2c_client *i2c_client) |
|
{ |
|
struct cs4270_private *cs4270 = i2c_get_clientdata(i2c_client); |
|
|
|
gpiod_set_value_cansleep(cs4270->reset_gpio, 0); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* cs4270_i2c_probe - initialize the I2C interface of the CS4270 |
|
* @i2c_client: the I2C client object |
|
* @id: the I2C device ID (ignored) |
|
* |
|
* This function is called whenever the I2C subsystem finds a device that |
|
* matches the device ID given via a prior call to i2c_add_driver(). |
|
*/ |
|
static int cs4270_i2c_probe(struct i2c_client *i2c_client, |
|
const struct i2c_device_id *id) |
|
{ |
|
struct cs4270_private *cs4270; |
|
unsigned int val; |
|
int ret, i; |
|
|
|
cs4270 = devm_kzalloc(&i2c_client->dev, sizeof(struct cs4270_private), |
|
GFP_KERNEL); |
|
if (!cs4270) |
|
return -ENOMEM; |
|
|
|
/* get the power supply regulators */ |
|
for (i = 0; i < ARRAY_SIZE(supply_names); i++) |
|
cs4270->supplies[i].supply = supply_names[i]; |
|
|
|
ret = devm_regulator_bulk_get(&i2c_client->dev, |
|
ARRAY_SIZE(cs4270->supplies), |
|
cs4270->supplies); |
|
if (ret < 0) |
|
return ret; |
|
|
|
/* reset the device */ |
|
cs4270->reset_gpio = devm_gpiod_get_optional(&i2c_client->dev, "reset", |
|
GPIOD_OUT_LOW); |
|
if (IS_ERR(cs4270->reset_gpio)) { |
|
dev_dbg(&i2c_client->dev, "Error getting CS4270 reset GPIO\n"); |
|
return PTR_ERR(cs4270->reset_gpio); |
|
} |
|
|
|
if (cs4270->reset_gpio) { |
|
dev_dbg(&i2c_client->dev, "Found reset GPIO\n"); |
|
gpiod_set_value_cansleep(cs4270->reset_gpio, 1); |
|
} |
|
|
|
/* Sleep 500ns before i2c communications */ |
|
ndelay(500); |
|
|
|
cs4270->regmap = devm_regmap_init_i2c(i2c_client, &cs4270_regmap); |
|
if (IS_ERR(cs4270->regmap)) |
|
return PTR_ERR(cs4270->regmap); |
|
|
|
/* Verify that we have a CS4270 */ |
|
ret = regmap_read(cs4270->regmap, CS4270_CHIPID, &val); |
|
if (ret < 0) { |
|
dev_err(&i2c_client->dev, "failed to read i2c at addr %X\n", |
|
i2c_client->addr); |
|
return ret; |
|
} |
|
/* The top four bits of the chip ID should be 1100. */ |
|
if ((val & 0xF0) != 0xC0) { |
|
dev_err(&i2c_client->dev, "device at addr %X is not a CS4270\n", |
|
i2c_client->addr); |
|
return -ENODEV; |
|
} |
|
|
|
dev_info(&i2c_client->dev, "found device at i2c address %X\n", |
|
i2c_client->addr); |
|
dev_info(&i2c_client->dev, "hardware revision %X\n", val & 0xF); |
|
|
|
i2c_set_clientdata(i2c_client, cs4270); |
|
|
|
ret = devm_snd_soc_register_component(&i2c_client->dev, |
|
&soc_component_device_cs4270, &cs4270_dai, 1); |
|
return ret; |
|
} |
|
|
|
/* |
|
* cs4270_id - I2C device IDs supported by this driver |
|
*/ |
|
static const struct i2c_device_id cs4270_id[] = { |
|
{"cs4270", 0}, |
|
{} |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, cs4270_id); |
|
|
|
/* |
|
* cs4270_i2c_driver - I2C device identification |
|
* |
|
* This structure tells the I2C subsystem how to identify and support a |
|
* given I2C device type. |
|
*/ |
|
static struct i2c_driver cs4270_i2c_driver = { |
|
.driver = { |
|
.name = "cs4270", |
|
.of_match_table = cs4270_of_match, |
|
}, |
|
.id_table = cs4270_id, |
|
.probe = cs4270_i2c_probe, |
|
.remove = cs4270_i2c_remove, |
|
}; |
|
|
|
module_i2c_driver(cs4270_i2c_driver); |
|
|
|
MODULE_AUTHOR("Timur Tabi <[email protected]>"); |
|
MODULE_DESCRIPTION("Cirrus Logic CS4270 ALSA SoC Codec Driver"); |
|
MODULE_LICENSE("GPL");
|
|
|