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Diffstat (limited to 'arch/arm/plat-samsung/adc.c')
-rw-r--r--arch/arm/plat-samsung/adc.c26
1 files changed, 20 insertions, 6 deletions
diff --git a/arch/arm/plat-samsung/adc.c b/arch/arm/plat-samsung/adc.c
index 210030d5cfe..04d9521ddc9 100644
--- a/arch/arm/plat-samsung/adc.c
+++ b/arch/arm/plat-samsung/adc.c
@@ -66,6 +66,7 @@ struct adc_device {
struct s3c_adc_client *cur;
struct s3c_adc_client *ts_pend;
void __iomem *regs;
+ spinlock_t lock;
unsigned int prescale;
@@ -74,7 +75,7 @@ struct adc_device {
static struct adc_device *adc_dev;
-static LIST_HEAD(adc_pending);
+static LIST_HEAD(adc_pending); /* protected by adc_device.lock */
#define adc_dbg(_adc, msg...) dev_dbg(&(_adc)->pdev->dev, msg)
@@ -145,7 +146,7 @@ int s3c_adc_start(struct s3c_adc_client *client,
if (client->is_ts && adc->ts_pend)
return -EAGAIN;
- local_irq_save(flags);
+ spin_lock_irqsave(&adc->lock, flags);
client->channel = channel;
client->nr_samples = nr_samples;
@@ -157,7 +158,8 @@ int s3c_adc_start(struct s3c_adc_client *client,
if (!adc->cur)
s3c_adc_try(adc);
- local_irq_restore(flags);
+
+ spin_unlock_irqrestore(&adc->lock, flags);
return 0;
}
@@ -237,6 +239,10 @@ EXPORT_SYMBOL_GPL(s3c_adc_register);
void s3c_adc_release(struct s3c_adc_client *client)
{
+ unsigned long flags;
+
+ spin_lock_irqsave(&adc_dev->lock, flags);
+
/* We should really check that nothing is in progress. */
if (adc_dev->cur == client)
adc_dev->cur = NULL;
@@ -255,6 +261,8 @@ void s3c_adc_release(struct s3c_adc_client *client)
if (adc_dev->cur == NULL)
s3c_adc_try(adc_dev);
+
+ spin_unlock_irqrestore(&adc_dev->lock, flags);
kfree(client);
}
EXPORT_SYMBOL_GPL(s3c_adc_release);
@@ -264,7 +272,6 @@ static irqreturn_t s3c_adc_irq(int irq, void *pw)
struct adc_device *adc = pw;
struct s3c_adc_client *client = adc->cur;
enum s3c_cpu_type cpu = platform_get_device_id(adc->pdev)->driver_data;
- unsigned long flags;
unsigned data0, data1;
if (!client) {
@@ -296,12 +303,12 @@ static irqreturn_t s3c_adc_irq(int irq, void *pw)
client->select_cb(client, 1);
s3c_adc_convert(adc);
} else {
- local_irq_save(flags);
+ spin_lock(&adc->lock);
(client->select_cb)(client, 0);
adc->cur = NULL;
s3c_adc_try(adc);
- local_irq_restore(flags);
+ spin_unlock(&adc->lock);
}
exit:
@@ -326,6 +333,8 @@ static int s3c_adc_probe(struct platform_device *pdev)
return -ENOMEM;
}
+ spin_lock_init(&adc->lock);
+
adc->pdev = pdev;
adc->prescale = S3C2410_ADCCON_PRSCVL(49);
@@ -407,13 +416,17 @@ static int __devexit s3c_adc_remove(struct platform_device *pdev)
static int s3c_adc_suspend(struct platform_device *pdev, pm_message_t state)
{
struct adc_device *adc = platform_get_drvdata(pdev);
+ unsigned long flags;
u32 con;
+ spin_lock_irqsave(&adc->lock, flags);
+
con = readl(adc->regs + S3C2410_ADCCON);
con |= S3C2410_ADCCON_STDBM;
writel(con, adc->regs + S3C2410_ADCCON);
disable_irq(adc->irq);
+ spin_unlock_irqrestore(&adc->lock, flags);
clk_disable(adc->clk);
return 0;
@@ -422,6 +435,7 @@ 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);
+ unsigned long flags;
clk_enable(adc->clk);
enable_irq(adc->irq);