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ASoC: wm2000: Integrate with clock API 

Request MCLK as a clock and then enable it when carrying out a state
transtion and while ANC is active, minimising system power consumption
in idle modes.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2012-12-13 17:29:00 +09:00
parent a49f0d1ea3
commit 514cfd6dd7
1 changed files with 22 additions and 1 deletions
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23
sound/soc/codecs/wm2000.c
View File

@ -26,6 +26,7 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/firmware.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
@ -62,6 +63,7 @@ enum wm2000_anc_mode {
struct wm2000_priv {
struct i2c_client *i2c;
struct regmap *regmap;
struct clk *mclk;
struct regulator_bulk_data supplies[WM2000_NUM_SUPPLIES];
@ -550,6 +552,15 @@ static int wm2000_anc_transition(struct wm2000_priv *wm2000,
return -EINVAL;
}
/* Maintain clock while active */
if (anc_transitions[i].source == ANC_OFF) {
ret = clk_prepare_enable(wm2000->mclk);
if (ret != 0) {
dev_err(&i2c->dev, "Failed to enable MCLK: %d\n", ret);
return ret;
}
}
for (j = 0; j < ARRAY_SIZE(anc_transitions[j].step); j++) {
if (!anc_transitions[i].step[j])
break;
@ -559,7 +570,10 @@ static int wm2000_anc_transition(struct wm2000_priv *wm2000,
return ret;
}
return 0;
if (anc_transitions[i].dest == ANC_OFF)
clk_disable_unprepare(wm2000->mclk);
return ret;
}
static int wm2000_anc_set_mode(struct wm2000_priv *wm2000)
@ -823,6 +837,13 @@ static int wm2000_i2c_probe(struct i2c_client *i2c,
reg = wm2000_read(i2c, WM2000_REG_REVISON);
dev_info(&i2c->dev, "revision %c\n", reg + 'A');
wm2000->mclk = devm_clk_get(&i2c->dev, "MCLK");
if (IS_ERR(wm2000->mclk)) {
ret = PTR_ERR(wm2000->mclk);
dev_err(&i2c->dev, "Failed to get MCLK: %d\n", ret);
goto err_supplies;
}
filename = "wm2000_anc.bin";
pdata = dev_get_platdata(&i2c->dev);
if (pdata) {