diff options
Diffstat (limited to 'sound/soc/codecs')
| -rw-r--r-- | sound/soc/codecs/sgtl5000.c | 96 | ||||
| -rw-r--r-- | sound/soc/codecs/sgtl5000.h | 4 |
2 files changed, 100 insertions, 0 deletions
diff --git a/sound/soc/codecs/sgtl5000.c b/sound/soc/codecs/sgtl5000.c index 178678d03d74..6e4bf1e3cd63 100644 --- a/sound/soc/codecs/sgtl5000.c +++ b/sound/soc/codecs/sgtl5000.c @@ -38,6 +38,10 @@ struct sgtl5000_priv { int capture_channels; int playback_active; int capture_active; + int clock_on; /* clock enable status */ + int need_clk_for_access; /* need clock on because doing access */ + int need_clk_for_bias; /* need clock on due to bias level */ + int (*clock_enable) (int enable); struct regulator *reg_vddio; struct regulator *reg_vdda; struct regulator *reg_vddd; @@ -54,6 +58,29 @@ static int sgtl5000_set_bias_level(struct snd_soc_codec *codec, #define SGTL5000_MAX_CACHED_REG SGTL5000_CHIP_SHORT_CTRL static u16 sgtl5000_regs[(SGTL5000_MAX_CACHED_REG >> 1) + 1]; +/* + * Schedule clock to be turned off or turn clock on. + */ +static void sgtl5000_clock_gating(struct snd_soc_codec *codec, int enable) +{ + struct sgtl5000_priv *sgtl5000 = snd_soc_codec_get_drvdata(codec); + + if (sgtl5000->clock_enable == NULL) + return; + + if (enable == 0) { + if (!sgtl5000->need_clk_for_access && + !sgtl5000->need_clk_for_bias) + schedule_delayed_work(&codec->delayed_work, + msecs_to_jiffies(300)); + } else { + if (!sgtl5000->clock_on) { + sgtl5000->clock_enable(1); + sgtl5000->clock_on = 1; + } + } +} + static unsigned int sgtl5000_read_reg_cache(struct snd_soc_codec *codec, unsigned int reg) { @@ -68,6 +95,7 @@ static unsigned int sgtl5000_read_reg_cache(struct snd_soc_codec *codec, static unsigned int sgtl5000_hw_read(struct snd_soc_codec *codec, unsigned int reg) { + struct sgtl5000_priv *sgtl5000 = snd_soc_codec_get_drvdata(codec); struct i2c_client *client = codec->control_data; int i2c_ret; u16 value; @@ -79,9 +107,13 @@ static unsigned int sgtl5000_hw_read(struct snd_soc_codec *codec, {addr, flags | I2C_M_RD, 2, buf1}, }; + sgtl5000->need_clk_for_access = 1; + sgtl5000_clock_gating(codec, 1); buf0[0] = (reg & 0xff00) >> 8; buf0[1] = reg & 0xff; i2c_ret = i2c_transfer(client->adapter, msg, 2); + sgtl5000->need_clk_for_access = 0; + sgtl5000_clock_gating(codec, 0); if (i2c_ret < 0) { pr_err("%s: read reg error : Reg 0x%02x\n", __func__, reg); return 0; @@ -116,6 +148,7 @@ static inline void sgtl5000_write_reg_cache(struct snd_soc_codec *codec, static int sgtl5000_write(struct snd_soc_codec *codec, unsigned int reg, unsigned int value) { + struct sgtl5000_priv *sgtl5000 = snd_soc_codec_get_drvdata(codec); struct i2c_client *client = codec->control_data; u16 addr = client->addr; u16 flags = client->flags; @@ -123,6 +156,8 @@ static int sgtl5000_write(struct snd_soc_codec *codec, unsigned int reg, int i2c_ret; struct i2c_msg msg = { addr, flags, 4, buf }; + sgtl5000->need_clk_for_access = 1; + sgtl5000_clock_gating(codec, 1); sgtl5000_write_reg_cache(codec, reg, value); pr_debug("w r:%02x,v:%04x\n", reg, value); buf[0] = (reg & 0xff00) >> 8; @@ -131,6 +166,8 @@ static int sgtl5000_write(struct snd_soc_codec *codec, unsigned int reg, buf[3] = value & 0xff; i2c_ret = i2c_transfer(client->adapter, &msg, 1); + sgtl5000->need_clk_for_access = 0; + sgtl5000_clock_gating(codec, 0); if (i2c_ret < 0) { pr_err("%s: write reg error : Reg 0x%02x = 0x%04x\n", __func__, reg, value); @@ -743,6 +780,7 @@ static void sgtl5000_mic_bias(struct snd_soc_codec *codec, int enable) static int sgtl5000_set_bias_level(struct snd_soc_codec *codec, enum snd_soc_bias_level level) { + struct sgtl5000_priv *sgtl5000 = snd_soc_codec_get_drvdata(codec); u16 reg, ana_pwr; int delay = 0; pr_debug("dapm level %d\n", level); @@ -761,6 +799,10 @@ static int sgtl5000_set_bias_level(struct snd_soc_codec *codec, break; case SND_SOC_BIAS_PREPARE: /* partial On */ + /* Keep clock on while in PREPARE or BIAS_ON state */ + sgtl5000->need_clk_for_bias = 1; + sgtl5000_clock_gating(codec, 1); + if (codec->bias_level == SND_SOC_BIAS_PREPARE) break; @@ -812,9 +854,15 @@ static int sgtl5000_set_bias_level(struct snd_soc_codec *codec, reg &= ~SGTL5000_DAC_EN; sgtl5000_write(codec, SGTL5000_CHIP_DIG_POWER, reg); + sgtl5000->need_clk_for_bias = 0; + sgtl5000_clock_gating(codec, 0); + break; case SND_SOC_BIAS_OFF: /* Off, without power */ + sgtl5000->need_clk_for_bias = 1; + sgtl5000_clock_gating(codec, 1); + /* must power down hp/line out after vag & dac to avoid pops. */ reg = sgtl5000_read(codec, SGTL5000_CHIP_ANA_POWER); @@ -837,6 +885,10 @@ static int sgtl5000_set_bias_level(struct snd_soc_codec *codec, /* save ANA POWER register value for resume */ sgtl5000_write_reg_cache(codec, SGTL5000_CHIP_ANA_POWER, ana_pwr); + + sgtl5000->need_clk_for_bias = 0; + sgtl5000_clock_gating(codec, 0); + break; } codec->bias_level = level; @@ -887,6 +939,23 @@ struct snd_soc_dai sgtl5000_dai = { }; EXPORT_SYMBOL_GPL(sgtl5000_dai); +/* + * Delayed work that turns off the audio clock after a delay. + */ +static void sgtl5000_work(struct work_struct *work) +{ + struct snd_soc_codec *codec = + container_of(work, struct snd_soc_codec, delayed_work.work); + struct sgtl5000_priv *sgtl5000 = snd_soc_codec_get_drvdata(codec); + + if (!sgtl5000->need_clk_for_access && + !sgtl5000->need_clk_for_bias && + sgtl5000->clock_on) { + sgtl5000->clock_enable(0); + sgtl5000->clock_on = 0; + } +} + static int sgtl5000_suspend(struct platform_device *pdev, pm_message_t state) { struct snd_soc_device *socdev = platform_get_drvdata(pdev); @@ -936,12 +1005,19 @@ static int sgtl5000_probe(struct platform_device *pdev) struct snd_soc_device *socdev = platform_get_drvdata(pdev); struct snd_soc_codec *codec = sgtl5000_codec; struct sgtl5000_priv *sgtl5000 = snd_soc_codec_get_drvdata(codec); + struct sgtl5000_setup_data *setup = socdev->codec_data; u16 reg, ana_pwr, lreg_ctrl, ref_ctrl, lo_ctrl, short_ctrl, sss; int vag; int ret = 0; socdev->card->codec = sgtl5000_codec; + if ((setup != NULL) && (setup->clock_enable != NULL)) { + sgtl5000->clock_enable = setup->clock_enable; + sgtl5000->need_clk_for_bias = 1; + INIT_DELAYED_WORK(&codec->delayed_work, sgtl5000_work); + } + /* register pcms */ ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); if (ret < 0) { @@ -1077,6 +1153,25 @@ static int sgtl5000_probe(struct platform_device *pdev) return 0; } +/* + * This function forces any delayed work to be queued and run. + */ +static int run_delayed_work(struct delayed_work *dwork) +{ + int ret; + + /* cancel any work waiting to be queued. */ + ret = cancel_delayed_work(dwork); + + /* if there was any work waiting then we run it now and + * wait for it's completion */ + if (ret) { + schedule_delayed_work(dwork, 0); + flush_scheduled_work(); + } + return ret; +} + /* power down chip */ static int sgtl5000_remove(struct platform_device *pdev) { @@ -1085,6 +1180,7 @@ static int sgtl5000_remove(struct platform_device *pdev) if (codec->control_data) sgtl5000_set_bias_level(codec, SND_SOC_BIAS_OFF); + run_delayed_work(&codec->delayed_work); snd_soc_free_pcms(socdev); snd_soc_dapm_free(socdev); diff --git a/sound/soc/codecs/sgtl5000.h b/sound/soc/codecs/sgtl5000.h index b1a755e29d57..49b444cd070d 100644 --- a/sound/soc/codecs/sgtl5000.h +++ b/sound/soc/codecs/sgtl5000.h @@ -403,4 +403,8 @@ extern struct snd_soc_codec_device soc_codec_dev_sgtl5000; #define SGTL5000_SYSCLK 0x00 #define SGTL5000_LRCLK 0x01 +struct sgtl5000_setup_data { + int (*clock_enable) (int enable); +}; + #endif |