diff options
Diffstat (limited to 'sound/soc/imx/imx-3stack-bt.c')
| -rw-r--r-- | sound/soc/imx/imx-3stack-bt.c | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/sound/soc/imx/imx-3stack-bt.c b/sound/soc/imx/imx-3stack-bt.c new file mode 100644 index 000000000000..4b6e36b629e6 --- /dev/null +++ b/sound/soc/imx/imx-3stack-bt.c @@ -0,0 +1,256 @@ +/* + * imx-3stack-bt.c -- SoC bluetooth audio for imx_3stack + * + * Copyright (C) 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/device.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/soc.h> +#include <sound/soc-dapm.h> +#include <sound/initval.h> + +#include "imx-pcm.h" +#include "imx-ssi.h" +#include "imx-3stack-bt.h" + +#define BT_SSI_MASTER 1 + +struct imx_3stack_priv { + struct platform_device *pdev; + int active; +}; + +static struct imx_3stack_priv card_priv; + +static void imx_3stack_init_dam(int ssi_port, int dai_port) +{ + /* bt uses SSI1 or SSI2 via AUDMUX port dai_port for audio */ + unsigned int ssi_ptcr = 0; + unsigned int dai_ptcr = 0; + unsigned int ssi_pdcr = 0; + unsigned int dai_pdcr = 0; + + /* reset port ssi_port & dai_port */ + __raw_writel(0, DAM_PTCR(ssi_port)); + __raw_writel(0, DAM_PTCR(dai_port)); + __raw_writel(0, DAM_PDCR(ssi_port)); + __raw_writel(0, DAM_PDCR(dai_port)); + + /* set to synchronous */ + ssi_ptcr |= AUDMUX_PTCR_SYN; + dai_ptcr |= AUDMUX_PTCR_SYN; + +#if BT_SSI_MASTER + /* set Rx sources ssi_port <--> dai_port */ + ssi_pdcr |= AUDMUX_PDCR_RXDSEL(dai_port); + dai_pdcr |= AUDMUX_PDCR_RXDSEL(ssi_port); + + /* set Tx frame direction and source dai_port--> ssi_port output */ + ssi_ptcr |= AUDMUX_PTCR_TFSDIR; + ssi_ptcr |= AUDMUX_PTCR_TFSSEL(AUDMUX_FROM_TXFS, dai_port); + + /* set Tx Clock direction and source dai_port--> ssi_port output */ + ssi_ptcr |= AUDMUX_PTCR_TCLKDIR; + ssi_ptcr |= AUDMUX_PTCR_TCSEL(AUDMUX_FROM_TXFS, dai_port); +#else + /* set Rx sources ssi_port <--> dai_port */ + ssi_pdcr |= AUDMUX_PDCR_RXDSEL(dai_port); + dai_pdcr |= AUDMUX_PDCR_RXDSEL(ssi_port); + + /* set Tx frame direction and source ssi_port --> dai_port output */ + dai_ptcr |= AUDMUX_PTCR_TFSDIR; + dai_ptcr |= AUDMUX_PTCR_TFSSEL(AUDMUX_FROM_TXFS, ssi_port); + + /* set Tx Clock direction and source ssi_port--> dai_port output */ + dai_ptcr |= AUDMUX_PTCR_TCLKDIR; + dai_ptcr |= AUDMUX_PTCR_TCSEL(AUDMUX_FROM_TXFS, ssi_port); +#endif + + __raw_writel(ssi_ptcr, DAM_PTCR(ssi_port)); + __raw_writel(dai_ptcr, DAM_PTCR(dai_port)); + __raw_writel(ssi_pdcr, DAM_PDCR(ssi_port)); + __raw_writel(dai_pdcr, DAM_PDCR(dai_port)); +} + +static int imx_3stack_bt_startup(struct snd_pcm_substream *substream) +{ + struct imx_3stack_priv *priv = &card_priv; + + if (!priv->active) + gpio_activate_bt_audio_port(); + priv->active++; + return 0; +} + +static int imx_3stack_bt_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + struct snd_soc_pcm_runtime *rtd = substream->private_data; + struct snd_soc_dai_link *pcm_link = rtd->dai; + struct snd_soc_dai *cpu_dai = pcm_link->cpu_dai; + unsigned int channels = params_channels(params); + struct imx_ssi *ssi_mode = (struct imx_ssi *)cpu_dai->private_data; + int ret = 0; + u32 dai_format; + +#if BT_SSI_MASTER + dai_format = SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_IB_IF | + SND_SOC_DAIFMT_CBM_CFM; +#else + dai_format = SND_SOC_DAIFMT_LEFT_J | SND_SOC_DAIFMT_IB_IF | + SND_SOC_DAIFMT_CBS_CFS; +#endif + + ssi_mode->sync_mode = 1; + if (channels == 1) + ssi_mode->network_mode = 0; + else + ssi_mode->network_mode = 1; + + /* set i.MX active slot mask */ + snd_soc_dai_set_tdm_slot(cpu_dai, + channels == 1 ? 0xfffffffe : 0xfffffffc, 2); + + /* set cpu DAI configuration */ + ret = snd_soc_dai_set_fmt(cpu_dai, dai_format); + if (ret < 0) + return ret; + + /* set the SSI system clock as input (unused) */ + snd_soc_dai_set_sysclk(cpu_dai, IMX_SSP_SYS_CLK, 0, SND_SOC_CLOCK_IN); + + return 0; +} + +static void imx_3stack_bt_shutdown(struct snd_pcm_substream *substream) +{ + struct imx_3stack_priv *priv = &card_priv; + + priv->active--; + if (!priv->active) + gpio_inactivate_bt_audio_port(); +} + +/* + * imx_3stack bt DAI opserations. + */ +static struct snd_soc_ops imx_3stack_bt_ops = { + .startup = imx_3stack_bt_startup, + .hw_params = imx_3stack_bt_hw_params, + .shutdown = imx_3stack_bt_shutdown, +}; + +static struct snd_soc_dai_link imx_3stack_dai = { + .name = "bluetooth", + .stream_name = "bluetooth", + .codec_dai = &bt_dai, + .ops = &imx_3stack_bt_ops, +}; + +static struct snd_soc_card snd_soc_card_imx_3stack = { + .name = "imx-3stack", + .platform = &imx_soc_platform, + .dai_link = &imx_3stack_dai, + .num_links = 1, +}; + +static struct snd_soc_device imx_3stack_snd_devdata = { + .card = &snd_soc_card_imx_3stack, + .codec_dev = &soc_codec_dev_bt, +}; + +/* + * This function will register the snd_soc_pcm_link drivers. + * It also registers devices for platform DMA, I2S, SSP and registers an + * I2C driver to probe the codec. + */ +static int __init imx_3stack_bt_probe(struct platform_device *pdev) +{ + struct mxc_audio_platform_data *dev_data = pdev->dev.platform_data; + struct imx_3stack_priv *priv = &card_priv; + struct snd_soc_dai *bt_cpu_dai; + + if (dev_data->src_port == 1) + bt_cpu_dai = imx_ssi_dai[0]; + else + bt_cpu_dai = imx_ssi_dai[2]; + + bt_cpu_dai->dev = &pdev->dev; + imx_3stack_dai.cpu_dai = bt_cpu_dai; + + /* Configure audio port */ + imx_3stack_init_dam(dev_data->src_port, dev_data->ext_port); + + priv->pdev = pdev; + priv->active = 0; + return 0; + +} + +static int __devexit imx_3stack_bt_remove(struct platform_device *pdev) +{ + return 0; +} + +static struct platform_driver imx_3stack_bt_driver = { + .probe = imx_3stack_bt_probe, + .remove = __devexit_p(imx_3stack_bt_remove), + .driver = { + .name = "imx-3stack-bt", + .owner = THIS_MODULE, + }, +}; + +static struct platform_device *imx_3stack_snd_device; + +static int __init imx_3stack_asoc_init(void) +{ + int ret; + + ret = platform_driver_register(&imx_3stack_bt_driver); + if (ret < 0) + goto exit; + imx_3stack_snd_device = platform_device_alloc("soc-audio", 4); + if (!imx_3stack_snd_device) + goto err_device_alloc; + platform_set_drvdata(imx_3stack_snd_device, &imx_3stack_snd_devdata); + imx_3stack_snd_devdata.dev = &imx_3stack_snd_device->dev; + ret = platform_device_add(imx_3stack_snd_device); + if (0 == ret) + goto exit; + + platform_device_put(imx_3stack_snd_device); +err_device_alloc: + platform_driver_unregister(&imx_3stack_bt_driver); +exit: + return ret; +} + +static void __exit imx_3stack_asoc_exit(void) +{ + platform_driver_unregister(&imx_3stack_bt_driver); + platform_device_unregister(imx_3stack_snd_device); +} + +module_init(imx_3stack_asoc_init); +module_exit(imx_3stack_asoc_exit); + +/* Module information */ +MODULE_DESCRIPTION("ALSA SoC bluetooth imx_3stack"); +MODULE_LICENSE("GPL"); |