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ARM: SAMSUNG: use regulator VDD for ADC

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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>
This commit is contained in:
MyungJoo Ham 2011-07-20 21:08:17 +09:00 committed by Kukjin Kim
parent 56c03d91f7
commit f462904ef1
1 changed files with 27 additions and 4 deletions
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31
arch/arm/plat-samsung/adc.c
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@ -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 @@ struct adc_device {
unsigned int prescale;
int irq;
struct regulator *vdd;
};
static struct adc_device *adc_dev;
@ -338,17 +340,24 @@ static int s3c_adc_probe(struct platform_device *pdev)
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 @@ static int s3c_adc_probe(struct platform_device *pdev)
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 @@ static int s3c_adc_probe(struct platform_device *pdev)
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 @@ static int __devexit s3c_adc_remove(struct platform_device *pdev)
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 @@ static int s3c_adc_suspend(struct platform_device *pdev, pm_message_t state)
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_suspend(struct platform_device *pdev, pm_message_t state)
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 @@ static int __init adc_init(void)
return ret;
}
arch_initcall(adc_init);
module_init(adc_init);