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461 lines
13 KiB
461 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// |
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// Freescale P1022DS ALSA SoC Machine driver |
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// |
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// Author: Timur Tabi <[email protected]> |
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// |
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// Copyright 2010 Freescale Semiconductor, Inc. |
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#include <linux/module.h> |
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#include <linux/fsl/guts.h> |
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#include <linux/interrupt.h> |
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#include <linux/of_address.h> |
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#include <linux/of_device.h> |
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#include <linux/slab.h> |
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#include <sound/soc.h> |
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#include "fsl_dma.h" |
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#include "fsl_ssi.h" |
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#include "fsl_utils.h" |
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/* P1022-specific PMUXCR and DMUXCR bit definitions */ |
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#define CCSR_GUTS_PMUXCR_UART0_I2C1_MASK 0x0001c000 |
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#define CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI 0x00010000 |
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#define CCSR_GUTS_PMUXCR_UART0_I2C1_SSI 0x00018000 |
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#define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK 0x00000c00 |
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#define CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI 0x00000000 |
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#define CCSR_GUTS_DMUXCR_PAD 1 /* DMA controller/channel set to pad */ |
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#define CCSR_GUTS_DMUXCR_SSI 2 /* DMA controller/channel set to SSI */ |
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/* |
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* Set the DMACR register in the GUTS |
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* |
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* The DMACR register determines the source of initiated transfers for each |
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* channel on each DMA controller. Rather than have a bunch of repetitive |
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* macros for the bit patterns, we just have a function that calculates |
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* them. |
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* |
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* guts: Pointer to GUTS structure |
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* co: The DMA controller (0 or 1) |
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* ch: The channel on the DMA controller (0, 1, 2, or 3) |
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* device: The device to set as the target (CCSR_GUTS_DMUXCR_xxx) |
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*/ |
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static inline void guts_set_dmuxcr(struct ccsr_guts __iomem *guts, |
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unsigned int co, unsigned int ch, unsigned int device) |
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{ |
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unsigned int shift = 16 + (8 * (1 - co) + 2 * (3 - ch)); |
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clrsetbits_be32(&guts->dmuxcr, 3 << shift, device << shift); |
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} |
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/* There's only one global utilities register */ |
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static phys_addr_t guts_phys; |
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/** |
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* machine_data: machine-specific ASoC device data |
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* |
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* This structure contains data for a single sound platform device on an |
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* P1022 DS. Some of the data is taken from the device tree. |
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*/ |
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struct machine_data { |
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struct snd_soc_dai_link dai[2]; |
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struct snd_soc_card card; |
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unsigned int dai_format; |
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unsigned int codec_clk_direction; |
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unsigned int cpu_clk_direction; |
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unsigned int clk_frequency; |
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unsigned int ssi_id; /* 0 = SSI1, 1 = SSI2, etc */ |
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unsigned int dma_id[2]; /* 0 = DMA1, 1 = DMA2, etc */ |
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unsigned int dma_channel_id[2]; /* 0 = ch 0, 1 = ch 1, etc*/ |
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char platform_name[2][DAI_NAME_SIZE]; /* One for each DMA channel */ |
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}; |
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/** |
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* p1022_ds_machine_probe: initialize the board |
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* |
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* This function is used to initialize the board-specific hardware. |
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* |
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* Here we program the DMACR and PMUXCR registers. |
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*/ |
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static int p1022_ds_machine_probe(struct snd_soc_card *card) |
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{ |
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struct machine_data *mdata = |
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container_of(card, struct machine_data, card); |
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struct ccsr_guts __iomem *guts; |
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guts = ioremap(guts_phys, sizeof(struct ccsr_guts)); |
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if (!guts) { |
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dev_err(card->dev, "could not map global utilities\n"); |
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return -ENOMEM; |
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} |
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/* Enable SSI Tx signal */ |
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clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK, |
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CCSR_GUTS_PMUXCR_UART0_I2C1_UART0_SSI); |
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/* Enable SSI Rx signal */ |
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clrsetbits_be32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK, |
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CCSR_GUTS_PMUXCR_SSI_DMA_TDM_SSI); |
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/* Enable DMA Channel for SSI */ |
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guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0], |
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CCSR_GUTS_DMUXCR_SSI); |
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guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1], |
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CCSR_GUTS_DMUXCR_SSI); |
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iounmap(guts); |
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return 0; |
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} |
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/** |
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* p1022_ds_startup: program the board with various hardware parameters |
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* |
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* This function takes board-specific information, like clock frequencies |
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* and serial data formats, and passes that information to the codec and |
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* transport drivers. |
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*/ |
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static int p1022_ds_startup(struct snd_pcm_substream *substream) |
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{ |
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); |
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struct machine_data *mdata = |
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container_of(rtd->card, struct machine_data, card); |
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struct device *dev = rtd->card->dev; |
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int ret = 0; |
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/* Tell the codec driver what the serial protocol is. */ |
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ret = snd_soc_dai_set_fmt(asoc_rtd_to_codec(rtd, 0), mdata->dai_format); |
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if (ret < 0) { |
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dev_err(dev, "could not set codec driver audio format\n"); |
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return ret; |
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} |
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/* |
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* Tell the codec driver what the MCLK frequency is, and whether it's |
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* a slave or master. |
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*/ |
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ret = snd_soc_dai_set_sysclk(asoc_rtd_to_codec(rtd, 0), 0, mdata->clk_frequency, |
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mdata->codec_clk_direction); |
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if (ret < 0) { |
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dev_err(dev, "could not set codec driver clock params\n"); |
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return ret; |
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} |
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return 0; |
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} |
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/** |
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* p1022_ds_machine_remove: Remove the sound device |
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* |
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* This function is called to remove the sound device for one SSI. We |
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* de-program the DMACR and PMUXCR register. |
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*/ |
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static int p1022_ds_machine_remove(struct snd_soc_card *card) |
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{ |
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struct machine_data *mdata = |
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container_of(card, struct machine_data, card); |
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struct ccsr_guts __iomem *guts; |
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guts = ioremap(guts_phys, sizeof(struct ccsr_guts)); |
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if (!guts) { |
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dev_err(card->dev, "could not map global utilities\n"); |
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return -ENOMEM; |
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} |
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/* Restore the signal routing */ |
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clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_UART0_I2C1_MASK); |
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clrbits32(&guts->pmuxcr, CCSR_GUTS_PMUXCR_SSI_DMA_TDM_MASK); |
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guts_set_dmuxcr(guts, mdata->dma_id[0], mdata->dma_channel_id[0], 0); |
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guts_set_dmuxcr(guts, mdata->dma_id[1], mdata->dma_channel_id[1], 0); |
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iounmap(guts); |
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return 0; |
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} |
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/** |
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* p1022_ds_ops: ASoC machine driver operations |
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*/ |
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static const struct snd_soc_ops p1022_ds_ops = { |
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.startup = p1022_ds_startup, |
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}; |
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/** |
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* p1022_ds_probe: platform probe function for the machine driver |
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* |
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* Although this is a machine driver, the SSI node is the "master" node with |
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* respect to audio hardware connections. Therefore, we create a new ASoC |
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* device for each new SSI node that has a codec attached. |
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*/ |
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static int p1022_ds_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = pdev->dev.parent; |
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/* ssi_pdev is the platform device for the SSI node that probed us */ |
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struct platform_device *ssi_pdev = to_platform_device(dev); |
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struct device_node *np = ssi_pdev->dev.of_node; |
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struct device_node *codec_np = NULL; |
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struct machine_data *mdata; |
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struct snd_soc_dai_link_component *comp; |
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int ret = -ENODEV; |
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const char *sprop; |
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const u32 *iprop; |
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/* Find the codec node for this SSI. */ |
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codec_np = of_parse_phandle(np, "codec-handle", 0); |
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if (!codec_np) { |
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dev_err(dev, "could not find codec node\n"); |
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return -EINVAL; |
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} |
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mdata = kzalloc(sizeof(struct machine_data), GFP_KERNEL); |
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if (!mdata) { |
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ret = -ENOMEM; |
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goto error_put; |
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} |
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comp = devm_kzalloc(&pdev->dev, 6 * sizeof(*comp), GFP_KERNEL); |
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if (!comp) { |
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ret = -ENOMEM; |
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goto error_put; |
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} |
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mdata->dai[0].cpus = &comp[0]; |
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mdata->dai[0].codecs = &comp[1]; |
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mdata->dai[0].platforms = &comp[2]; |
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mdata->dai[0].num_cpus = 1; |
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mdata->dai[0].num_codecs = 1; |
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mdata->dai[0].num_platforms = 1; |
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mdata->dai[1].cpus = &comp[3]; |
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mdata->dai[1].codecs = &comp[4]; |
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mdata->dai[1].platforms = &comp[5]; |
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mdata->dai[1].num_cpus = 1; |
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mdata->dai[1].num_codecs = 1; |
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mdata->dai[1].num_platforms = 1; |
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mdata->dai[0].cpus->dai_name = dev_name(&ssi_pdev->dev); |
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mdata->dai[0].ops = &p1022_ds_ops; |
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/* ASoC core can match codec with device node */ |
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mdata->dai[0].codecs->of_node = codec_np; |
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/* We register two DAIs per SSI, one for playback and the other for |
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* capture. We support codecs that have separate DAIs for both playback |
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* and capture. |
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*/ |
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memcpy(&mdata->dai[1], &mdata->dai[0], sizeof(struct snd_soc_dai_link)); |
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/* The DAI names from the codec (snd_soc_dai_driver.name) */ |
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mdata->dai[0].codecs->dai_name = "wm8776-hifi-playback"; |
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mdata->dai[1].codecs->dai_name = "wm8776-hifi-capture"; |
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/* Get the device ID */ |
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iprop = of_get_property(np, "cell-index", NULL); |
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if (!iprop) { |
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dev_err(&pdev->dev, "cell-index property not found\n"); |
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ret = -EINVAL; |
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goto error; |
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} |
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mdata->ssi_id = be32_to_cpup(iprop); |
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/* Get the serial format and clock direction. */ |
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sprop = of_get_property(np, "fsl,mode", NULL); |
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if (!sprop) { |
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dev_err(&pdev->dev, "fsl,mode property not found\n"); |
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ret = -EINVAL; |
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goto error; |
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} |
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if (strcasecmp(sprop, "i2s-slave") == 0) { |
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mdata->dai_format = SND_SOC_DAIFMT_NB_NF | |
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SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBM_CFM; |
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mdata->codec_clk_direction = SND_SOC_CLOCK_OUT; |
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mdata->cpu_clk_direction = SND_SOC_CLOCK_IN; |
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/* In i2s-slave mode, the codec has its own clock source, so we |
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* need to get the frequency from the device tree and pass it to |
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* the codec driver. |
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*/ |
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iprop = of_get_property(codec_np, "clock-frequency", NULL); |
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if (!iprop || !*iprop) { |
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dev_err(&pdev->dev, "codec bus-frequency " |
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"property is missing or invalid\n"); |
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ret = -EINVAL; |
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goto error; |
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} |
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mdata->clk_frequency = be32_to_cpup(iprop); |
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} else if (strcasecmp(sprop, "i2s-master") == 0) { |
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mdata->dai_format = SND_SOC_DAIFMT_NB_NF | |
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SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS; |
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mdata->codec_clk_direction = SND_SOC_CLOCK_IN; |
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mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT; |
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} else if (strcasecmp(sprop, "lj-slave") == 0) { |
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mdata->dai_format = SND_SOC_DAIFMT_NB_NF | |
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SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBM_CFM; |
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mdata->codec_clk_direction = SND_SOC_CLOCK_OUT; |
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mdata->cpu_clk_direction = SND_SOC_CLOCK_IN; |
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} else if (strcasecmp(sprop, "lj-master") == 0) { |
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mdata->dai_format = SND_SOC_DAIFMT_NB_NF | |
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SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_CBS_CFS; |
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mdata->codec_clk_direction = SND_SOC_CLOCK_IN; |
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mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT; |
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} else if (strcasecmp(sprop, "rj-slave") == 0) { |
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mdata->dai_format = SND_SOC_DAIFMT_NB_NF | |
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SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBM_CFM; |
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mdata->codec_clk_direction = SND_SOC_CLOCK_OUT; |
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mdata->cpu_clk_direction = SND_SOC_CLOCK_IN; |
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} else if (strcasecmp(sprop, "rj-master") == 0) { |
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mdata->dai_format = SND_SOC_DAIFMT_NB_NF | |
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SND_SOC_DAIFMT_RIGHT_J | SND_SOC_DAIFMT_CBS_CFS; |
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mdata->codec_clk_direction = SND_SOC_CLOCK_IN; |
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mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT; |
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} else if (strcasecmp(sprop, "ac97-slave") == 0) { |
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mdata->dai_format = SND_SOC_DAIFMT_NB_NF | |
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SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBM_CFM; |
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mdata->codec_clk_direction = SND_SOC_CLOCK_OUT; |
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mdata->cpu_clk_direction = SND_SOC_CLOCK_IN; |
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} else if (strcasecmp(sprop, "ac97-master") == 0) { |
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mdata->dai_format = SND_SOC_DAIFMT_NB_NF | |
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SND_SOC_DAIFMT_AC97 | SND_SOC_DAIFMT_CBS_CFS; |
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mdata->codec_clk_direction = SND_SOC_CLOCK_IN; |
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mdata->cpu_clk_direction = SND_SOC_CLOCK_OUT; |
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} else { |
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dev_err(&pdev->dev, |
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"unrecognized fsl,mode property '%s'\n", sprop); |
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ret = -EINVAL; |
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goto error; |
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} |
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if (!mdata->clk_frequency) { |
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dev_err(&pdev->dev, "unknown clock frequency\n"); |
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ret = -EINVAL; |
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goto error; |
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} |
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/* Find the playback DMA channel to use. */ |
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mdata->dai[0].platforms->name = mdata->platform_name[0]; |
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ret = fsl_asoc_get_dma_channel(np, "fsl,playback-dma", &mdata->dai[0], |
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&mdata->dma_channel_id[0], |
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&mdata->dma_id[0]); |
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if (ret) { |
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dev_err(&pdev->dev, "missing/invalid playback DMA phandle\n"); |
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goto error; |
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} |
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/* Find the capture DMA channel to use. */ |
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mdata->dai[1].platforms->name = mdata->platform_name[1]; |
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ret = fsl_asoc_get_dma_channel(np, "fsl,capture-dma", &mdata->dai[1], |
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&mdata->dma_channel_id[1], |
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&mdata->dma_id[1]); |
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if (ret) { |
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dev_err(&pdev->dev, "missing/invalid capture DMA phandle\n"); |
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goto error; |
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} |
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/* Initialize our DAI data structure. */ |
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mdata->dai[0].stream_name = "playback"; |
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mdata->dai[1].stream_name = "capture"; |
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mdata->dai[0].name = mdata->dai[0].stream_name; |
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mdata->dai[1].name = mdata->dai[1].stream_name; |
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mdata->card.probe = p1022_ds_machine_probe; |
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mdata->card.remove = p1022_ds_machine_remove; |
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mdata->card.name = pdev->name; /* The platform driver name */ |
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mdata->card.owner = THIS_MODULE; |
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mdata->card.dev = &pdev->dev; |
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mdata->card.num_links = 2; |
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mdata->card.dai_link = mdata->dai; |
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/* Register with ASoC */ |
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ret = snd_soc_register_card(&mdata->card); |
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if (ret) { |
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dev_err(&pdev->dev, "could not register card\n"); |
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goto error; |
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} |
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of_node_put(codec_np); |
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return 0; |
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error: |
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kfree(mdata); |
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error_put: |
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of_node_put(codec_np); |
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return ret; |
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} |
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/** |
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* p1022_ds_remove: remove the platform device |
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* |
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* This function is called when the platform device is removed. |
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*/ |
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static int p1022_ds_remove(struct platform_device *pdev) |
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{ |
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struct snd_soc_card *card = platform_get_drvdata(pdev); |
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struct machine_data *mdata = |
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container_of(card, struct machine_data, card); |
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snd_soc_unregister_card(card); |
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kfree(mdata); |
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return 0; |
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} |
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static struct platform_driver p1022_ds_driver = { |
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.probe = p1022_ds_probe, |
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.remove = p1022_ds_remove, |
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.driver = { |
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/* |
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* The name must match 'compatible' property in the device tree, |
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* in lowercase letters. |
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*/ |
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.name = "snd-soc-p1022ds", |
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}, |
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}; |
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/** |
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* p1022_ds_init: machine driver initialization. |
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* |
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* This function is called when this module is loaded. |
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*/ |
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static int __init p1022_ds_init(void) |
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{ |
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struct device_node *guts_np; |
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struct resource res; |
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/* Get the physical address of the global utilities registers */ |
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guts_np = of_find_compatible_node(NULL, NULL, "fsl,p1022-guts"); |
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if (of_address_to_resource(guts_np, 0, &res)) { |
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pr_err("snd-soc-p1022ds: missing/invalid global utils node\n"); |
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of_node_put(guts_np); |
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return -EINVAL; |
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} |
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guts_phys = res.start; |
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of_node_put(guts_np); |
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return platform_driver_register(&p1022_ds_driver); |
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} |
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/** |
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* p1022_ds_exit: machine driver exit |
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* |
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* This function is called when this driver is unloaded. |
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*/ |
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static void __exit p1022_ds_exit(void) |
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{ |
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platform_driver_unregister(&p1022_ds_driver); |
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} |
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module_init(p1022_ds_init); |
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module_exit(p1022_ds_exit); |
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MODULE_AUTHOR("Timur Tabi <[email protected]>"); |
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MODULE_DESCRIPTION("Freescale P1022 DS ALSA SoC machine driver"); |
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MODULE_LICENSE("GPL v2");
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