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Date: Sat, 30 Nov 2013 16:26:00 +0100
From: Marek Belisko <marek@...delico.com>
To: arnd@...db.de, gregkh@...uxfoundation.org
Cc: rob.herring@...xeda.com, pawel.moll@....com, mark.rutland@....com,
swarren@...dotorg.org, ijc+devicetree@...lion.org.uk,
rob@...dley.net, devicetree@...r.kernel.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
neilb@...e.de, hns@...delico.com,
Marek Belisko <marek@...delico.com>
Subject: [PATCH v2 1/2] misc: bmp085: Clean up and enable use of interrupt for completion.
- pass IRQ to driver and have it initialize
- finish waiting early if interrupt fires
Signed-off-by: NeilBrown <neilb@...e.de>
Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
Signed-off-by: Marek Belisko <marek@...delico.com>
---
drivers/misc/bmp085-i2c.c | 2 +-
drivers/misc/bmp085-spi.c | 2 +-
drivers/misc/bmp085.c | 39 ++++++++++++++++++++++++++++++++++-----
drivers/misc/bmp085.h | 2 +-
4 files changed, 37 insertions(+), 8 deletions(-)
diff --git a/drivers/misc/bmp085-i2c.c b/drivers/misc/bmp085-i2c.c
index 3abfcec..a7c1629 100644
--- a/drivers/misc/bmp085-i2c.c
+++ b/drivers/misc/bmp085-i2c.c
@@ -49,7 +49,7 @@ static int bmp085_i2c_probe(struct i2c_client *client,
return err;
}
- return bmp085_probe(&client->dev, regmap);
+ return bmp085_probe(&client->dev, regmap, client->irq);
}
static int bmp085_i2c_remove(struct i2c_client *client)
diff --git a/drivers/misc/bmp085-spi.c b/drivers/misc/bmp085-spi.c
index d6a5265..864ecac 100644
--- a/drivers/misc/bmp085-spi.c
+++ b/drivers/misc/bmp085-spi.c
@@ -41,7 +41,7 @@ static int bmp085_spi_probe(struct spi_device *client)
return err;
}
- return bmp085_probe(&client->dev, regmap);
+ return bmp085_probe(&client->dev, regmap, client->irq);
}
static int bmp085_spi_remove(struct spi_device *client)
diff --git a/drivers/misc/bmp085.c b/drivers/misc/bmp085.c
index 2704d88..820e53d 100644
--- a/drivers/misc/bmp085.c
+++ b/drivers/misc/bmp085.c
@@ -49,9 +49,11 @@
#include <linux/device.h>
#include <linux/init.h>
#include <linux/slab.h>
-#include <linux/delay.h>
#include <linux/of.h>
#include "bmp085.h"
+#include <linux/interrupt.h>
+#include <linux/completion.h>
+#include <linux/gpio.h>
#define BMP085_CHIP_ID 0x55
#define BMP085_CALIBRATION_DATA_START 0xAA
@@ -84,8 +86,19 @@ struct bmp085_data {
unsigned long last_temp_measurement;
u8 chip_id;
s32 b6; /* calculated temperature correction coefficient */
+ int irq;
+ struct completion done;
};
+static irqreturn_t bmp085_eoc_isr(int irq, void *devid)
+{
+ struct bmp085_data *data = devid;
+
+ complete(&data->done);
+
+ return IRQ_HANDLED;
+}
+
static s32 bmp085_read_calibration_data(struct bmp085_data *data)
{
u16 tmp[BMP085_CALIBRATION_DATA_LENGTH];
@@ -116,6 +129,9 @@ static s32 bmp085_update_raw_temperature(struct bmp085_data *data)
s32 status;
mutex_lock(&data->lock);
+
+ init_completion(&data->done);
+
status = regmap_write(data->regmap, BMP085_CTRL_REG,
BMP085_TEMP_MEASUREMENT);
if (status < 0) {
@@ -123,7 +139,8 @@ static s32 bmp085_update_raw_temperature(struct bmp085_data *data)
"Error while requesting temperature measurement.\n");
goto exit;
}
- msleep(BMP085_TEMP_CONVERSION_TIME);
+ wait_for_completion_timeout(&data->done, 1 + msecs_to_jiffies(
+ BMP085_TEMP_CONVERSION_TIME));
status = regmap_bulk_read(data->regmap, BMP085_CONVERSION_REGISTER_MSB,
&tmp, sizeof(tmp));
@@ -147,6 +164,9 @@ static s32 bmp085_update_raw_pressure(struct bmp085_data *data)
s32 status;
mutex_lock(&data->lock);
+
+ init_completion(&data->done);
+
status = regmap_write(data->regmap, BMP085_CTRL_REG,
BMP085_PRESSURE_MEASUREMENT +
(data->oversampling_setting << 6));
@@ -157,8 +177,8 @@ static s32 bmp085_update_raw_pressure(struct bmp085_data *data)
}
/* wait for the end of conversion */
- msleep(2+(3 << data->oversampling_setting));
-
+ wait_for_completion_timeout(&data->done, 1 + msecs_to_jiffies(
+ 2+(3 << data->oversampling_setting)));
/* copy data into a u32 (4 bytes), but skip the first byte. */
status = regmap_bulk_read(data->regmap, BMP085_CONVERSION_REGISTER_MSB,
((u8 *)&tmp)+1, 3);
@@ -420,7 +440,7 @@ struct regmap_config bmp085_regmap_config = {
};
EXPORT_SYMBOL_GPL(bmp085_regmap_config);
-int bmp085_probe(struct device *dev, struct regmap *regmap)
+int bmp085_probe(struct device *dev, struct regmap *regmap, int irq)
{
struct bmp085_data *data;
int err = 0;
@@ -434,6 +454,15 @@ int bmp085_probe(struct device *dev, struct regmap *regmap)
dev_set_drvdata(dev, data);
data->dev = dev;
data->regmap = regmap;
+ data->irq = irq;
+
+ if (data->irq > 0) {
+ err = devm_request_irq(dev, data->irq, bmp085_eoc_isr,
+ IRQF_TRIGGER_RISING, "bmp085",
+ data);
+ if (err < 0)
+ goto exit_free;
+ }
/* Initialize the BMP085 chip */
err = bmp085_init_client(data);
diff --git a/drivers/misc/bmp085.h b/drivers/misc/bmp085.h
index 2b8f615..8b8e3b1 100644
--- a/drivers/misc/bmp085.h
+++ b/drivers/misc/bmp085.h
@@ -26,7 +26,7 @@
extern struct regmap_config bmp085_regmap_config;
-int bmp085_probe(struct device *dev, struct regmap *regmap);
+int bmp085_probe(struct device *dev, struct regmap *regmap, int irq);
int bmp085_remove(struct device *dev);
int bmp085_detect(struct device *dev);
--
1.8.3.2
--
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