/* * imx-ssi.c -- SSI driver for Freescale IMX * * Copyright 2006 Wolfson Microelectronics PLC. * Author: Liam Girdwood * liam.girdwood@wolfsonmicro.com or linux@wolfsonmicro.com * * Copyright (C) 2006-2010 Freescale Semiconductor, Inc. * Based on mxc-alsa-mc13783 * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * Revision history * 29th Aug 2006 Initial version. * * TODO: * Need to rework SSI register defs when new defs go into mainline. * Add support for TDM and FIFO 1. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "imx-ssi.h" #include "imx-pcm.h" #define SSI_STX0 (0x00) #define SSI_STX1 (0x04) #define SSI_SRX0 (0x08) #define SSI_SRX1 (0x0c) #define SSI_SCR (0x10) #define SSI_SISR (0x14) #define SSI_SIER (0x18) #define SSI_STCR (0x1c) #define SSI_SRCR (0x20) #define SSI_STCCR (0x24) #define SSI_SRCCR (0x28) #define SSI_SFCSR (0x2c) #define SSI_STR (0x30) #define SSI_SOR (0x34) #define SSI_SACNT (0x38) #define SSI_SACADD (0x3c) #define SSI_SACDAT (0x40) #define SSI_SATAG (0x44) #define SSI_STMSK (0x48) #define SSI_SRMSK (0x4c) #define SSI_SACCST (0x50) #define SSI_SACCEN (0x54) #define SSI_SACCDIS (0x58) /* debug */ #define IMX_SSI_DEBUG 0 #if IMX_SSI_DEBUG #define dbg(format, arg...) printk(format, ## arg) #else #define dbg(format, arg...) #endif #define IMX_SSI_DUMP 0 #if IMX_SSI_DUMP #define SSI_DUMP() \ do { \ printk(KERN_INFO "dump @ %s\n", __func__); \ printk(KERN_INFO "scr %x\t, %x\n", \ __raw_readl(ioaddr + SSI_SCR), \ __raw_readl(ioaddr + SSI_SCR)); \ printk(KERN_INFO "sisr %x\t, %x\n", \ __raw_readl(ioaddr + SSI_SISR), \ __raw_readl(ioaddr + SSI_SISR)); \ printk(KERN_INFO "stcr %x\t, %x\n", \ __raw_readl(ioaddr + SSI_STCR), \ __raw_readl(ioaddr + SSI_STCR)); \ printk(KERN_INFO "srcr %x\t, %x\n", \ __raw_readl(ioaddr + SSI_SRCR), \ __raw_readl(ioaddr + SSI_SRCR)); \ printk(KERN_INFO "stccr %x\t, %x\n", \ __raw_readl(ioaddr + SSI_STCCR), \ __raw_readl(ioaddr + SSI_STCCR)); \ printk(KERN_INFO "srccr %x\t, %x\n", \ __raw_readl(ioaddr + SSI_SRCCR), \ __raw_readl(ioaddr + SSI_SRCCR)); \ printk(KERN_INFO "sfcsr %x\t, %x\n", \ __raw_readl(ioaddr + SSI_SFCSR), \ __raw_readl(ioaddr + SSI_SFCSR)); \ printk(KERN_INFO "stmsk %x\t, %x\n", \ __raw_readl(ioaddr + SSI_STMSK), \ __raw_readl(ioaddr + SSI_STMSK)); \ printk(KERN_INFO "srmsk %x\t, %x\n", \ __raw_readl(ioaddr + SSI_SRMSK), \ __raw_readl(ioaddr + SSI_SRMSK)); \ printk(KERN_INFO "sier %x\t, %x\n", \ __raw_readl(ioaddr + SSI_SIER), \ __raw_readl(ioaddr + SSI_SIER)); \ } while (0); #else #define SSI_DUMP() #endif /* * SSI system clock configuration. * Should only be called when port is inactive (i.e. SSIEN = 0). */ static int imx_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai, int clk_id, unsigned int freq, int dir) { struct imx_ssi *priv = (struct imx_ssi *)cpu_dai->private_data; void __iomem *ioaddr = priv->ioaddr; u32 scr; scr = __raw_readl(ioaddr + SSI_SCR); if (scr & SSI_SCR_SSIEN) return 0; switch (clk_id) { case IMX_SSP_SYS_CLK: if (dir == SND_SOC_CLOCK_OUT) scr |= SSI_SCR_SYS_CLK_EN; else scr &= ~SSI_SCR_SYS_CLK_EN; break; default: return -EINVAL; } __raw_writel(scr, ioaddr + SSI_SCR); return 0; } /* * SSI Clock dividers * Should only be called when port is inactive (i.e. SSIEN = 0). */ static int imx_ssi_set_dai_clkdiv(struct snd_soc_dai *cpu_dai, int div_id, int div) { struct imx_ssi *priv = (struct imx_ssi *)cpu_dai->private_data; void __iomem *ioaddr = priv->ioaddr; u32 stccr, srccr; if (__raw_readl(ioaddr + SSI_SCR) & SSI_SCR_SSIEN) return 0; srccr = __raw_readl(ioaddr + SSI_SRCCR); stccr = __raw_readl(ioaddr + SSI_STCCR); switch (div_id) { case IMX_SSI_TX_DIV_2: stccr &= ~SSI_STCCR_DIV2; stccr |= div; break; case IMX_SSI_TX_DIV_PSR: stccr &= ~SSI_STCCR_PSR; stccr |= div; break; case IMX_SSI_TX_DIV_PM: stccr &= ~0xff; stccr |= SSI_STCCR_PM(div); break; case IMX_SSI_RX_DIV_2: stccr &= ~SSI_STCCR_DIV2; stccr |= div; break; case IMX_SSI_RX_DIV_PSR: stccr &= ~SSI_STCCR_PSR; stccr |= div; break; case IMX_SSI_RX_DIV_PM: stccr &= ~0xff; stccr |= SSI_STCCR_PM(div); break; default: return -EINVAL; } __raw_writel(stccr, ioaddr + SSI_STCCR); __raw_writel(srccr, ioaddr + SSI_SRCCR); return 0; } /* * SSI Network Mode or TDM slots configuration. * Should only be called when port is inactive (i.e. SSIEN = 0). */ static int imx_ssi_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai, unsigned int mask, int slots) { struct imx_ssi *priv = (struct imx_ssi *)cpu_dai->private_data; void __iomem *ioaddr = priv->ioaddr; u32 stmsk, srmsk, stccr; if (__raw_readl(ioaddr + SSI_SCR) & SSI_SCR_SSIEN) return 0; stccr = __raw_readl(ioaddr + SSI_STCCR); stmsk = srmsk = mask; stccr &= ~SSI_STCCR_DC_MASK; stccr |= SSI_STCCR_DC(slots - 1); __raw_writel(stmsk, ioaddr + SSI_STMSK); __raw_writel(srmsk, ioaddr + SSI_SRMSK); __raw_writel(stccr, ioaddr + SSI_STCCR); __raw_writel(stccr, ioaddr + SSI_SRCCR); return 0; } /* * SSI DAI format configuration. * Should only be called when port is inactive (i.e. SSIEN = 0). * Note: We don't use the I2S modes but instead manually configure the * SSI for I2S. */ static int imx_ssi_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) { struct imx_ssi *priv = (struct imx_ssi *)cpu_dai->private_data; void __iomem *ioaddr = priv->ioaddr; u32 stcr = 0, srcr = 0, scr; scr = __raw_readl(ioaddr + SSI_SCR) & ~(SSI_SCR_SYN | SSI_SCR_NET); if (scr & SSI_SCR_SSIEN) return 0; /* DAI mode */ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { case SND_SOC_DAIFMT_I2S: /* data on rising edge of bclk, frame low 1clk before data */ stcr |= SSI_STCR_TFSI | SSI_STCR_TEFS | SSI_STCR_TXBIT0; srcr |= SSI_SRCR_RFSI | SSI_SRCR_REFS | SSI_SRCR_RXBIT0; break; case SND_SOC_DAIFMT_LEFT_J: /* data on rising edge of bclk, frame high with data */ stcr |= SSI_STCR_TXBIT0; srcr |= SSI_SRCR_RXBIT0; break; case SND_SOC_DAIFMT_DSP_B: /* data on rising edge of bclk, frame high with data */ stcr |= SSI_STCR_TFSL; srcr |= SSI_SRCR_RFSL; break; case SND_SOC_DAIFMT_DSP_A: /* data on rising edge of bclk, frame high 1clk before data */ stcr |= SSI_STCR_TFSL | SSI_STCR_TEFS; srcr |= SSI_SRCR_RFSL | SSI_SRCR_REFS; break; } /* DAI clock inversion */ switch (fmt & SND_SOC_DAIFMT_INV_MASK) { case SND_SOC_DAIFMT_IB_IF: stcr &= ~(SSI_STCR_TSCKP | SSI_STCR_TFSI); srcr &= ~(SSI_SRCR_RSCKP | SSI_SRCR_RFSI); break; case SND_SOC_DAIFMT_IB_NF: stcr |= SSI_STCR_TFSI; stcr &= ~SSI_STCR_TSCKP; srcr |= SSI_SRCR_RFSI; srcr &= ~SSI_SRCR_RSCKP; break; case SND_SOC_DAIFMT_NB_IF: stcr &= ~SSI_STCR_TFSI; stcr |= SSI_STCR_TSCKP; srcr &= ~SSI_SRCR_RFSI; srcr |= SSI_SRCR_RSCKP; break; case SND_SOC_DAIFMT_NB_NF: stcr |= SSI_STCR_TFSI | SSI_STCR_TSCKP; srcr |= SSI_SRCR_RFSI | SSI_SRCR_RSCKP; break; } /* DAI clock master masks */ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { case SND_SOC_DAIFMT_CBS_CFS: stcr |= SSI_STCR_TFDIR | SSI_STCR_TXDIR; if (((fmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_I2S) && priv->network_mode) { scr &= ~SSI_SCR_I2S_MODE_MASK; scr |= SSI_SCR_I2S_MODE_MSTR; } break; case SND_SOC_DAIFMT_CBM_CFS: stcr |= SSI_STCR_TFDIR; srcr |= SSI_SRCR_RFDIR; break; case SND_SOC_DAIFMT_CBS_CFM: stcr |= SSI_STCR_TXDIR; srcr |= SSI_SRCR_RXDIR; break; case SND_SOC_DAIFMT_CBM_CFM: if (((fmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_I2S) && priv->network_mode) { scr &= ~SSI_SCR_I2S_MODE_MASK; scr |= SSI_SCR_I2S_MODE_SLAVE; } break; } /* sync */ if (priv->sync_mode) scr |= SSI_SCR_SYN; /* tdm - only for stereo atm */ if (priv->network_mode) scr |= SSI_SCR_NET; __raw_writel(stcr, ioaddr + SSI_STCR); __raw_writel(srcr, ioaddr + SSI_SRCR); __raw_writel(scr, ioaddr + SSI_SCR); SSI_DUMP(); return 0; } static int imx_ssi_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { struct imx_ssi *priv = (struct imx_ssi *)cpu_dai->private_data; void __iomem *ioaddr = priv->ioaddr; /* we cant really change any SSI values after SSI is enabled * need to fix in software for max flexibility - lrg */ if (cpu_dai->playback.active || cpu_dai->capture.active) return 0; /* reset the SSI port - Sect 45.4.4 */ if (clk_get_usecount(priv->ssi_clk) != 0) { clk_enable(priv->ssi_clk); return 0; } __raw_writel(0, ioaddr + SSI_SCR); clk_enable(priv->ssi_clk); /* BIG FAT WARNING * SDMA FIFO watermark must == SSI FIFO watermark for best results. */ __raw_writel((SSI_SFCSR_RFWM1(SSI_RXFIFO_WATERMARK) | SSI_SFCSR_RFWM0(SSI_RXFIFO_WATERMARK) | SSI_SFCSR_TFWM1(SSI_TXFIFO_WATERMARK) | SSI_SFCSR_TFWM0(SSI_TXFIFO_WATERMARK)), ioaddr + SSI_SFCSR); __raw_writel(0, ioaddr + SSI_SIER); SSI_DUMP(); return 0; } static int imx_ssi_hw_tx_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *cpu_dai) { struct imx_ssi *priv = (struct imx_ssi *)cpu_dai->private_data; void __iomem *ioaddr = priv->ioaddr; u32 stccr, stcr, sier; stccr = __raw_readl(ioaddr + SSI_STCCR) & ~SSI_STCCR_WL_MASK; stcr = __raw_readl(ioaddr + SSI_STCR); sier = __raw_readl(ioaddr + SSI_SIER); /* DAI data (word) size */ switch (params_format(params)) { case SNDRV_PCM_FORMAT_S16_LE: stccr |= SSI_STCCR_WL(16); break; case SNDRV_PCM_FORMAT_S20_3LE: stccr |= SSI_STCCR_WL(20); break; case SNDRV_PCM_FORMAT_S24_LE: stccr |= SSI_STCCR_WL(24); break; } /* enable interrupts */ if ((cpu_dai->id & 0x1) == 0) stcr |= SSI_STCR_TFEN0; else stcr |= SSI_STCR_TFEN1; sier |= SSI_SIER_TDMAE | SSI_SIER_TIE | SSI_SIER_TUE0_EN; __raw_writel(stcr, ioaddr + SSI_STCR); __raw_writel(stccr, ioaddr + SSI_STCCR); __raw_writel(sier, ioaddr + SSI_SIER); return 0; } static int imx_ssi_hw_rx_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *cpu_dai) { u32 srccr, srcr, sier; struct imx_ssi *priv = (struct imx_ssi *)cpu_dai->private_data; void __iomem *ioaddr = priv->ioaddr; bool sync_mode = priv->sync_mode; srccr = sync_mode ? __raw_readl(ioaddr + SSI_STCCR) : __raw_readl(ioaddr + SSI_SRCCR); srcr = __raw_readl(ioaddr + SSI_SRCR); sier = __raw_readl(ioaddr + SSI_SIER); srccr &= ~SSI_SRCCR_WL_MASK; /* DAI data (word) size */ switch (params_format(params)) { case SNDRV_PCM_FORMAT_S16_LE: srccr |= SSI_SRCCR_WL(16); break; case SNDRV_PCM_FORMAT_S20_3LE: srccr |= SSI_SRCCR_WL(20); break; case SNDRV_PCM_FORMAT_S24_LE: srccr |= SSI_SRCCR_WL(24); break; } /* enable interrupts */ if ((cpu_dai->id & 0x1) == 0) srcr |= SSI_SRCR_RFEN0; else srcr |= SSI_SRCR_RFEN1; sier |= SSI_SIER_RDMAE | SSI_SIER_RIE | SSI_SIER_ROE0_EN; __raw_writel(srcr, ioaddr + SSI_SRCR); if (sync_mode) __raw_writel(srccr, ioaddr + SSI_STCCR); else __raw_writel(srccr, ioaddr + SSI_SRCCR); __raw_writel(sier, ioaddr + SSI_SIER); return 0; } /* * Should only be called when port is inactive (i.e. SSIEN = 0), * although can be called multiple times by upper layers. */ static int imx_ssi_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *cpu_dai) { struct imx_ssi *priv = (struct imx_ssi *)cpu_dai->private_data; void __iomem *ioaddr = priv->ioaddr; int id; id = cpu_dai->id; /* Tx/Rx config */ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { /* cant change any parameters when SSI is running */ if ((__raw_readl(ioaddr + SSI_SCR) & SSI_SCR_SSIEN) && (__raw_readl(ioaddr + SSI_SCR) & SSI_SCR_TE)) return 0; return imx_ssi_hw_tx_params(substream, params, cpu_dai); } else { /* cant change any parameters when SSI is running */ if ((__raw_readl(ioaddr + SSI_SCR) & SSI_SCR_SSIEN) && (__raw_readl(ioaddr + SSI_SCR) & SSI_SCR_RE)) return 0; return imx_ssi_hw_rx_params(substream, params, cpu_dai); } } static int imx_ssi_prepare(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { struct imx_ssi *priv = (struct imx_ssi *)cpu_dai->private_data; void __iomem *ioaddr = priv->ioaddr; u32 scr; /* enable the SSI port, note that no other port config * should happen after SSIEN is set */ scr = __raw_readl(ioaddr + SSI_SCR); __raw_writel((scr | SSI_SCR_SSIEN), ioaddr + SSI_SCR); SSI_DUMP(); return 0; } static int imx_ssi_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *cpu_dai) { struct imx_ssi *priv = (struct imx_ssi *)cpu_dai->private_data; void __iomem *ioaddr = priv->ioaddr; u32 scr; scr = __raw_readl(ioaddr + SSI_SCR); switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { if (scr & SSI_SCR_RE) { __raw_writel(0, ioaddr + SSI_SCR); } scr |= SSI_SCR_TE; } else scr |= SSI_SCR_RE; break; case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) scr &= ~SSI_SCR_TE; else scr &= ~SSI_SCR_RE; break; default: return -EINVAL; } __raw_writel(scr, ioaddr + SSI_SCR); SSI_DUMP(); return 0; } static void imx_ssi_shutdown(struct snd_pcm_substream *substream, struct snd_soc_dai *cpu_dai) { struct imx_ssi *priv = (struct imx_ssi *)cpu_dai->private_data; void __iomem *ioaddr = priv->ioaddr; int id; id = cpu_dai->id; /* shutdown SSI if neither Tx or Rx is active */ if (cpu_dai->playback.active || cpu_dai->capture.active) return; if (clk_get_usecount(priv->ssi_clk) > 1) { clk_disable(priv->ssi_clk); return; } __raw_writel(0, ioaddr + SSI_SCR); clk_disable(priv->ssi_clk); } #ifdef CONFIG_PM static int imx_ssi_suspend(struct snd_soc_dai *dai) { if (!dai->active) return 0; /* do we need to disable any clocks? */ return 0; } static int imx_ssi_resume(struct snd_soc_dai *dai) { if (!dai->active) return 0; /* do we need to enable any clocks? */ return 0; } #else #define imx_ssi_suspend NULL #define imx_ssi_resume NULL #endif static int fifo_err_counter; static irqreturn_t imx_ssi_irq(int irq, void *dev_id) { struct platform_device *pdev = dev_id; struct imx_ssi *pdata = platform_get_drvdata(pdev); void __iomem *ioaddr = pdata->ioaddr; if (fifo_err_counter++ % 1000 == 0) printk(KERN_ERR "%s %s SISR %x SIER %x fifo_errs=%d\n", __func__, pdev->name, __raw_readl(ioaddr + SSI_SISR), __raw_readl(ioaddr + SSI_SIER), fifo_err_counter); __raw_writel((SSI_SIER_TUE0_EN | SSI_SIER_ROE0_EN), ioaddr + SSI_SISR); return IRQ_HANDLED; } static int imx_ssi_probe(struct platform_device *pdev, struct snd_soc_dai *dai) { struct imx_ssi *priv = (struct imx_ssi *)dai->private_data; if (priv->irq >= 0) { if (request_irq(priv->irq, imx_ssi_irq, IRQF_SHARED, pdev->name, dai)) { printk(KERN_ERR "%s: failure requesting irq for %s\n", __func__, pdev->name); return -EBUSY; } } return 0; } static void imx_ssi_remove(struct platform_device *pdev, struct snd_soc_dai *dai) { struct imx_ssi *priv = (struct imx_ssi *)dai->private_data; if (priv->irq >= 0) free_irq(priv->irq, dai); } #define IMX_SSI_RATES \ (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | \ SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | \ SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | \ SNDRV_PCM_RATE_96000) #define IMX_SSI_FORMATS \ (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \ SNDRV_PCM_FMTBIT_S24_LE) static struct snd_soc_dai_ops imx_ssi_dai_ops = { .startup = imx_ssi_startup, .shutdown = imx_ssi_shutdown, .trigger = imx_ssi_trigger, .prepare = imx_ssi_prepare, .hw_params = imx_ssi_hw_params, .set_sysclk = imx_ssi_set_dai_sysclk, .set_clkdiv = imx_ssi_set_dai_clkdiv, .set_fmt = imx_ssi_set_dai_fmt, .set_tdm_slot = imx_ssi_set_dai_tdm_slot, }; struct snd_soc_dai *imx_ssi_dai[MAX_SSI_CHANNELS]; EXPORT_SYMBOL_GPL(imx_ssi_dai); static int imx_ssi_dev_probe(struct platform_device *pdev) { int fifo0_channel = pdev->id * 2; struct snd_soc_dai *dai; struct imx_ssi *priv; int fifo, channel; struct resource *res; int ret; BUG_ON(fifo0_channel >= MAX_SSI_CHANNELS); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -ENODEV; priv = kzalloc(sizeof(struct imx_ssi), GFP_KERNEL); if (!priv) return -ENOMEM; /* Each SSI block has 2 fifos which share the same private data (struct imx_ssi) */ priv->baseaddr = res->start; priv->ioaddr = ioremap(res->start, 0x5C); priv->irq = platform_get_irq(pdev, 0); priv->ssi_clk = clk_get(&pdev->dev, "ssi_clk"); priv->pdev = pdev; for (fifo = 0; fifo < 2; fifo++) { channel = (pdev->id * 2) + fifo; dai = kzalloc(sizeof(struct snd_soc_dai), GFP_KERNEL); if (IS_ERR(dai)) { ret = -ENOMEM; goto DAI_ERR; } dai->name = kasprintf(GFP_KERNEL, "imx-ssi-%d-%d", pdev->id + 1, fifo); if (IS_ERR(dai->name)) { kfree(dai); ret = -ENOMEM; goto DAI_ERR; } dai->probe = imx_ssi_probe; dai->suspend = imx_ssi_suspend; dai->remove = imx_ssi_remove; dai->resume = imx_ssi_resume; dai->playback.channels_min = 1; dai->playback.channels_max = 2; dai->playback.rates = IMX_SSI_RATES; dai->playback.formats = IMX_SSI_FORMATS; dai->capture.channels_min = 1; dai->capture.channels_max = 2; dai->capture.rates = IMX_SSI_RATES; dai->capture.formats = IMX_SSI_FORMATS; dai->ops = &imx_ssi_dai_ops; dai->private_data = priv; dai->id = channel; imx_ssi_dai[channel] = dai; ret = snd_soc_register_dai(dai); if (ret < 0) { kfree(dai->name); kfree(dai); goto DAI_ERR; } } return 0; DAI_ERR: if (fifo == 1) { dai = imx_ssi_dai[fifo0_channel]; snd_soc_unregister_dai(dai); kfree(dai->name); kfree(dai); } clk_put(priv->ssi_clk); iounmap(priv->ioaddr); kfree(priv); return ret; } static int __devexit imx_ssi_dev_remove(struct platform_device *pdev) { int fifo0_channel = pdev->id * 2; int fifo1_channel = (pdev->id * 2) + 1; struct imx_ssi *priv = imx_ssi_dai[fifo0_channel]->private_data; snd_soc_unregister_dai(imx_ssi_dai[fifo0_channel]); snd_soc_unregister_dai(imx_ssi_dai[fifo1_channel]); kfree(imx_ssi_dai[fifo0_channel]->name); kfree(imx_ssi_dai[fifo0_channel]); kfree(imx_ssi_dai[fifo1_channel]->name); kfree(imx_ssi_dai[fifo1_channel]); clk_put(priv->ssi_clk); iounmap(priv->ioaddr); kfree(priv); return 0; } static struct platform_driver imx_ssi_driver = { .probe = imx_ssi_dev_probe, .remove = __devexit_p(imx_ssi_dev_remove), .driver = { .name = "mxc_ssi", }, }; static int __init imx_ssi_init(void) { return platform_driver_register(&imx_ssi_driver); } static void __exit imx_ssi_exit(void) { platform_driver_unregister(&imx_ssi_driver); } module_init(imx_ssi_init); module_exit(imx_ssi_exit); MODULE_AUTHOR ("Liam Girdwood, liam.girdwood@wolfsonmicro.com, www.wolfsonmicro.com"); MODULE_DESCRIPTION("i.MX ASoC I2S driver"); MODULE_LICENSE("GPL");