From f4ad756aceabef95fea74609de81375ee8efc6c5 Mon Sep 17 00:00:00 2001 From: Nelson Castillo Date: Tue, 22 Sep 2009 05:23:04 -0500 Subject: S3C: ADC: Expose number of remaining conversions to convert callback This patch allow us to efficiently modify the number of remaining conversions from the client side. This us useful when we do not know in advance how many conversions we will need or when we need to cancel pending conversions. This change is simple enough to be compatible with existing code that can just define the new pointer in the callback and ignore it. Sample usage: http://tinyurl.com/s3c2410-ts-c (function stylus_adc_action). Signed-off-by: Nelson Castillo Signed-off-by: Ben Dooks --- arch/arm/plat-s3c/include/plat/adc.h | 3 ++- arch/arm/plat-s3c24xx/adc.c | 11 +++++++---- 2 files changed, 9 insertions(+), 5 deletions(-) (limited to 'arch') diff --git a/arch/arm/plat-s3c/include/plat/adc.h b/arch/arm/plat-s3c/include/plat/adc.h index ef92e50ac0a..d847bd476b6 100644 --- a/arch/arm/plat-s3c/include/plat/adc.h +++ b/arch/arm/plat-s3c/include/plat/adc.h @@ -22,7 +22,8 @@ extern int s3c_adc_start(struct s3c_adc_client *client, extern struct s3c_adc_client * s3c_adc_register(struct platform_device *pdev, void (*select)(unsigned selected), - void (*conv)(unsigned d0, unsigned d1), + void (*conv)(unsigned d0, unsigned d1, + unsigned *samples_left), unsigned int is_ts); extern void s3c_adc_release(struct s3c_adc_client *client); diff --git a/arch/arm/plat-s3c24xx/adc.c b/arch/arm/plat-s3c24xx/adc.c index 9a5c767e0a4..03429b2a27f 100644 --- a/arch/arm/plat-s3c24xx/adc.c +++ b/arch/arm/plat-s3c24xx/adc.c @@ -45,7 +45,8 @@ struct s3c_adc_client { unsigned char channel; void (*select_cb)(unsigned selected); - void (*convert_cb)(unsigned val1, unsigned val2); + void (*convert_cb)(unsigned val1, unsigned val2, + unsigned *samples_left); }; struct adc_device { @@ -158,7 +159,8 @@ static void s3c_adc_default_select(unsigned select) struct s3c_adc_client *s3c_adc_register(struct platform_device *pdev, void (*select)(unsigned int selected), - void (*conv)(unsigned d0, unsigned d1), + void (*conv)(unsigned d0, unsigned d1, + unsigned *samples_left), unsigned int is_ts) { struct s3c_adc_client *client; @@ -210,9 +212,10 @@ static irqreturn_t s3c_adc_irq(int irq, void *pw) data1 = readl(adc->regs + S3C2410_ADCDAT1); adc_dbg(adc, "read %d: 0x%04x, 0x%04x\n", client->nr_samples, data0, data1); - (client->convert_cb)(data0 & 0x3ff, data1 & 0x3ff); + client->nr_samples--; + (client->convert_cb)(data0 & 0x3ff, data1 & 0x3ff, &client->nr_samples); - if (--client->nr_samples > 0) { + if (client->nr_samples > 0) { /* fire another conversion for this */ client->select_cb(1); -- cgit v1.2.3