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authorLee Jones <lee.jones@linaro.org>2013-02-04 08:33:13 +0000
committerLee Jones <lee.jones@linaro.org>2013-02-04 08:33:13 +0000
commit5f8aaef4fdf97bfe504ff2c78244a53a145917dc (patch)
tree208d3e78144a06c6db90f46908786d0df0de94f0 /drivers/mfd
parent8f0eb43be5f461a28341fe724686f265b0719dd3 (diff)
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mfd: ab8500-gpadc: Add runtime pm support
Add runtime pm support to speed up multiple ADC reads in a row. Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com> Reviewed-by: Ulf HANSSON <ulf.hansson@stericsson.com>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/ab8500-gpadc.c70
1 files changed, 64 insertions, 6 deletions
diff --git a/drivers/mfd/ab8500-gpadc.c b/drivers/mfd/ab8500-gpadc.c
index 61b176f..580f100 100644
--- a/drivers/mfd/ab8500-gpadc.c
+++ b/drivers/mfd/ab8500-gpadc.c
@@ -12,6 +12,7 @@
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
+#include <linux/pm_runtime.h>
#include <linux/platform_device.h>
#include <linux/completion.h>
#include <linux/regulator/consumer.h>
@@ -82,6 +83,9 @@
/* This is used to not lose precision when dividing to get gain and offset */
#define CALIB_SCALE 1000
+/* Time in ms before disabling regulator */
+#define GPADC_AUDOSUSPEND_DELAY 1
+
enum cal_channels {
ADC_INPUT_VMAIN = 0,
ADC_INPUT_BTEMP,
@@ -282,8 +286,9 @@ int ab8500_gpadc_read_raw(struct ab8500_gpadc *gpadc, u8 channel)
return -ENODEV;
mutex_lock(&gpadc->ab8500_gpadc_lock);
+
/* Enable VTVout LDO this is required for GPADC */
- regulator_enable(gpadc->regu);
+ pm_runtime_get_sync(gpadc->dev);
/* Check if ADC is not busy, lock and proceed */
do {
@@ -397,8 +402,10 @@ int ab8500_gpadc_read_raw(struct ab8500_gpadc *gpadc, u8 channel)
dev_err(gpadc->dev, "gpadc_conversion: disable gpadc failed\n");
goto out;
}
- /* Disable VTVout LDO this is required for GPADC */
- regulator_disable(gpadc->regu);
+
+ pm_runtime_mark_last_busy(gpadc->dev);
+ pm_runtime_put_autosuspend(gpadc->dev);
+
mutex_unlock(&gpadc->ab8500_gpadc_lock);
return (high_data << 8) | low_data;
@@ -412,7 +419,9 @@ out:
*/
(void) abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
AB8500_GPADC_CTRL1_REG, DIS_GPADC);
- regulator_disable(gpadc->regu);
+
+ pm_runtime_put(gpadc->dev);
+
mutex_unlock(&gpadc->ab8500_gpadc_lock);
dev_err(gpadc->dev,
"gpadc_conversion: Failed to AD convert channel %d\n", channel);
@@ -571,6 +580,30 @@ static void ab8500_gpadc_read_calibration_data(struct ab8500_gpadc *gpadc)
gpadc->cal_data[ADC_INPUT_VBAT].offset);
}
+static int ab8500_gpadc_runtime_suspend(struct device *dev)
+{
+ struct ab8500_gpadc *gpadc = dev_get_drvdata(dev);
+
+ regulator_disable(gpadc->regu);
+ return 0;
+}
+
+static int ab8500_gpadc_runtime_resume(struct device *dev)
+{
+ struct ab8500_gpadc *gpadc = dev_get_drvdata(dev);
+
+ regulator_enable(gpadc->regu);
+ return 0;
+}
+
+static int ab8500_gpadc_runtime_idle(struct device *dev)
+{
+ struct ab8500_gpadc *gpadc = dev_get_drvdata(dev);
+
+ pm_runtime_suspend(dev);
+ return 0;
+}
+
static int ab8500_gpadc_probe(struct platform_device *pdev)
{
int ret = 0;
@@ -615,6 +648,16 @@ static int ab8500_gpadc_probe(struct platform_device *pdev)
dev_err(gpadc->dev, "failed to get vtvout LDO\n");
goto fail_irq;
}
+
+ platform_set_drvdata(pdev, gpadc);
+
+ regulator_enable(gpadc->regu);
+
+ pm_runtime_set_autosuspend_delay(gpadc->dev, GPADC_AUDOSUSPEND_DELAY);
+ pm_runtime_use_autosuspend(gpadc->dev);
+ pm_runtime_set_active(gpadc->dev);
+ pm_runtime_enable(gpadc->dev);
+
ab8500_gpadc_read_calibration_data(gpadc);
list_add_tail(&gpadc->node, &ab8500_gpadc_list);
dev_dbg(gpadc->dev, "probe success\n");
@@ -635,19 +678,34 @@ static int ab8500_gpadc_remove(struct platform_device *pdev)
list_del(&gpadc->node);
/* remove interrupt - completion of Sw ADC conversion */
free_irq(gpadc->irq, gpadc);
- /* disable VTVout LDO that is being used by GPADC */
- regulator_put(gpadc->regu);
+
+ pm_runtime_get_sync(gpadc->dev);
+ pm_runtime_disable(gpadc->dev);
+
+ regulator_disable(gpadc->regu);
+
+ pm_runtime_set_suspended(gpadc->dev);
+
+ pm_runtime_put_noidle(gpadc->dev);
+
kfree(gpadc);
gpadc = NULL;
return 0;
}
+static const struct dev_pm_ops ab8500_gpadc_pm_ops = {
+ SET_RUNTIME_PM_OPS(ab8500_gpadc_runtime_suspend,
+ ab8500_gpadc_runtime_resume,
+ ab8500_gpadc_runtime_idle)
+};
+
static struct platform_driver ab8500_gpadc_driver = {
.probe = ab8500_gpadc_probe,
.remove = ab8500_gpadc_remove,
.driver = {
.name = "ab8500-gpadc",
.owner = THIS_MODULE,
+ .pm = &ab8500_gpadc_pm_ops,
},
};