From 3f7ea467be1bad860c0f71ba7373dd3cf76b485a Mon Sep 17 00:00:00 2001 From: Nelson Castillo Date: Fri, 8 May 2009 08:10:12 -0500 Subject: [ARM] 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-s3c24xx/adc.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) (limited to 'arch/arm/plat-s3c24xx/adc.c') diff --git a/arch/arm/plat-s3c24xx/adc.c b/arch/arm/plat-s3c24xx/adc.c index 91adfa71c172..ee1baf11ad9e 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; @@ -227,9 +229,10 @@ 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 v1.2.1