linux-kernel - [PATCH 3/4] MFD/PCAP: set_ts

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Date:	Tue, 23 Jun 2009 12:33:10 -0300
From:	Daniel Ribeiro <drwyrm@...il.com>
To:	Samuel Ortiz <sameo@...ux.intel.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	openezx-devel <openezx-devel@...ts.openezx.org>
Subject: [PATCH 3/4] MFD/PCAP: set_ts_bits()

Some TS controller bits are on the same register as the ADC control, save 
TS specific bits and export a set_ts_bits function so the TS driver can set
it with the adc_mutex lock held.

Signed-off-by: Daniel Ribeiro <drwyrm@...il.com>

---
 drivers/mfd/ezx-pcap.c       |   22 ++++++++++++++++++----
 include/linux/mfd/ezx-pcap.h |    1 +
 2 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/drivers/mfd/ezx-pcap.c b/drivers/mfd/ezx-pcap.c
index de7e637..c512202 100644
--- a/drivers/mfd/ezx-pcap.c
+++ b/drivers/mfd/ezx-pcap.c
@@ -195,6 +195,19 @@ static void pcap_irq_handler(unsigned int irq, struct irq_desc *desc)
 }
 
 /* ADC */
+void pcap_set_ts_bits(struct pcap_chip *pcap, u32 bits)
+{
+	u32 tmp;
+
+	mutex_lock(&pcap->adc_mutex);
+	ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);
+	tmp &= ~(PCAP_ADC_TS_M_MASK | PCAP_ADC_TS_REF_LOWPWR);
+	tmp |= bits & (PCAP_ADC_TS_M_MASK | PCAP_ADC_TS_REF_LOWPWR);
+	ezx_pcap_write(pcap, PCAP_REG_ADC, tmp);
+	mutex_unlock(&pcap->adc_mutex);
+}
+EXPORT_SYMBOL_GPL(pcap_set_ts_bits);
+
 static void pcap_disable_adc(struct pcap_chip *pcap)
 {
 	u32 tmp;
@@ -217,15 +230,16 @@ static void pcap_adc_trigger(struct pcap_chip *pcap)
 		mutex_unlock(&pcap->adc_mutex);
 		return;
 	}
-	mutex_unlock(&pcap->adc_mutex);
-
-	/* start conversion on requested bank */
-	tmp = pcap->adc_queue[head]->flags | PCAP_ADC_ADEN;
+	/* start conversion on requested bank, save TS_M bits */
+	ezx_pcap_read(pcap, PCAP_REG_ADC, &tmp);
+	tmp &= (PCAP_ADC_TS_M_MASK | PCAP_ADC_TS_REF_LOWPWR);
+	tmp |= pcap->adc_queue[head]->flags | PCAP_ADC_ADEN;
 
 	if (pcap->adc_queue[head]->bank == PCAP_ADC_BANK_1)
 		tmp |= PCAP_ADC_AD_SEL1;
 
 	ezx_pcap_write(pcap, PCAP_REG_ADC, tmp);
+	mutex_unlock(&pcap->adc_mutex);
 	ezx_pcap_write(pcap, PCAP_REG_ADR, PCAP_ADR_ASC);
 }
 
diff --git a/include/linux/mfd/ezx-pcap.h b/include/linux/mfd/ezx-pcap.h
index 6296b49..b15caac 100644
--- a/include/linux/mfd/ezx-pcap.h
+++ b/include/linux/mfd/ezx-pcap.h
@@ -29,6 +29,7 @@ int pcap_to_irq(struct pcap_chip *, int);
 int irq_to_pcap(struct pcap_chip *, int);
 int pcap_adc_async(struct pcap_chip *, u8, u32, u8[], void *, void *);
 int pcap_adc_sync(struct pcap_chip *, u8, u32, u8[], u16[]);
+void pcap_set_ts_bits(struct pcap_chip *, u32);
 
 #define PCAP_SECOND_PORT	1
 #define PCAP_CS_AH		2
-- 
tg: (bd75754..) pcap/set_ts_bits (depends on: pcap/irq_to_pcap)

-- 
Daniel Ribeiro

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