ARM: SAMSUNG: use regulator VDD for ADC
This patch allows the Samsung ADC driver to enable VDD regulator
at probe and resume and to disable at exit and suspend.
In a platform where ADC's VDD regulator is not "always-on", this
control is required although this patch does not provide fine-grained
power control (turning on the regulator only when being accessed).
However, if VDD regulator ("vdd" for the adc device) is not provided,
the regulator control will not be activated because there are platforms
that do not provide regulator for ADC device.
arch_initcall has been modified to module_init in order to allow
regulators to be available at probe.
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/plat-samsung/adc.c b/arch/arm/plat-samsung/adc.c
index e8f2be2..2224128 100644
--- a/arch/arm/plat-samsung/adc.c
+++ b/arch/arm/plat-samsung/adc.c
@@ -21,6 +21,7 @@
#include <linux/clk.h>
#include <linux/interrupt.h>
#include <linux/io.h>
+#include <linux/regulator/consumer.h>
#include <plat/regs-adc.h>
#include <plat/adc.h>
@@ -71,6 +72,7 @@
unsigned int prescale;
int irq;
+ struct regulator *vdd;
};
static struct adc_device *adc_dev;
@@ -338,17 +340,24 @@
adc->pdev = pdev;
adc->prescale = S3C2410_ADCCON_PRSCVL(49);
+ adc->vdd = regulator_get(dev, "vdd");
+ if (IS_ERR(adc->vdd)) {
+ dev_err(dev, "operating without regulator \"vdd\" .\n");
+ ret = PTR_ERR(adc->vdd);
+ goto err_alloc;
+ }
+
adc->irq = platform_get_irq(pdev, 1);
if (adc->irq <= 0) {
dev_err(dev, "failed to get adc irq\n");
ret = -ENOENT;
- goto err_alloc;
+ goto err_reg;
}
ret = request_irq(adc->irq, s3c_adc_irq, 0, dev_name(dev), adc);
if (ret < 0) {
dev_err(dev, "failed to attach adc irq\n");
- goto err_alloc;
+ goto err_reg;
}
adc->clk = clk_get(dev, "adc");
@@ -372,6 +381,10 @@
goto err_clk;
}
+ ret = regulator_enable(adc->vdd);
+ if (ret)
+ goto err_ioremap;
+
clk_enable(adc->clk);
tmp = adc->prescale | S3C2410_ADCCON_PRSCEN;
@@ -388,12 +401,15 @@
return 0;
+ err_ioremap:
+ iounmap(adc->regs);
err_clk:
clk_put(adc->clk);
err_irq:
free_irq(adc->irq, adc);
-
+ err_reg:
+ regulator_put(adc->vdd);
err_alloc:
kfree(adc);
return ret;
@@ -406,6 +422,8 @@
iounmap(adc->regs);
free_irq(adc->irq, adc);
clk_disable(adc->clk);
+ regulator_disable(adc->vdd);
+ regulator_put(adc->vdd);
clk_put(adc->clk);
kfree(adc);
@@ -428,6 +446,7 @@
disable_irq(adc->irq);
spin_unlock_irqrestore(&adc->lock, flags);
clk_disable(adc->clk);
+ regulator_disable(adc->vdd);
return 0;
}
@@ -435,7 +454,11 @@
static int s3c_adc_resume(struct platform_device *pdev)
{
struct adc_device *adc = platform_get_drvdata(pdev);
+ int ret;
+ ret = regulator_enable(adc->vdd);
+ if (ret)
+ return ret;
clk_enable(adc->clk);
enable_irq(adc->irq);
@@ -485,4 +508,4 @@
return ret;
}
-arch_initcall(adc_init);
+module_init(adc_init);