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Date: Thu, 14 Nov 2013 22:46:47 +0100
From: Marek Belisko <marek@...delico.com>
To: arnd@...db.de, gregkh@...uxfoundation.org
Cc: neilb@...e.de, hns@...delico.com, 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, Marek Belisko <marek@...delico.com>
Subject: [PATCH 1/3] misc: bmp085: Clean up and enable use of interrupt for completion.
- pass GPIO or IRQ to driver and have it initialize the GPIO and
the IRQ
- finish waiting early if interrupt fires
- clean up GPIO and IRQ on exit.
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.c | 68 +++++++++++++++++++++++++++++++++++++++++-----
include/linux/i2c/bmp085.h | 17 ++++++++++++
2 files changed, 78 insertions(+), 7 deletions(-)
create mode 100644 include/linux/i2c/bmp085.h
diff --git a/drivers/misc/bmp085.c b/drivers/misc/bmp085.c
index 2704d88..1510a7b 100644
--- a/drivers/misc/bmp085.c
+++ b/drivers/misc/bmp085.c
@@ -49,9 +49,12 @@
#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>
+#include <linux/i2c/bmp085.h>
#define BMP085_CHIP_ID 0x55
#define BMP085_CALIBRATION_DATA_START 0xAA
@@ -84,8 +87,20 @@ struct bmp085_data {
unsigned long last_temp_measurement;
u8 chip_id;
s32 b6; /* calculated temperature correction coefficient */
+ int irq;
+ int gpio;
+ 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 +131,9 @@ 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 +141,8 @@ 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 +166,9 @@ 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 +179,8 @@ 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);
@@ -423,6 +445,7 @@ EXPORT_SYMBOL_GPL(bmp085_regmap_config);
int bmp085_probe(struct device *dev, struct regmap *regmap)
{
struct bmp085_data *data;
+ struct bmp085_platform_data *pdata = dev->platform_data;
int err = 0;
data = kzalloc(sizeof(struct bmp085_data), GFP_KERNEL);
@@ -435,26 +458,54 @@ int bmp085_probe(struct device *dev, struct regmap *regmap)
data->dev = dev;
data->regmap = regmap;
+ if (pdata && gpio_is_valid(pdata->gpio)) {
+ err = devm_gpio_request(dev, pdata->gpio, "bmp085_eoc_irq");
+ if (err)
+ goto exit_free;
+ err = gpio_direction_input(pdata->gpio);
+ if (err)
+ goto exit_free;
+ data->irq = gpio_to_irq(pdata->gpio);
+ data->gpio = pdata->gpio;
+ } else {
+ if (pdata)
+ data->irq = pdata->irq;
+ else
+ data->irq = 0;
+ data->gpio = -EINVAL;
+ }
+ if (data->irq > 0) {
+ err = request_any_context_irq(data->irq, bmp085_eoc_isr,
+ IRQF_TRIGGER_RISING, "bmp085",
+ data);
+ if (err < 0)
+ goto exit_free;
+ } else
+ data->irq = 0;
+
/* Initialize the BMP085 chip */
err = bmp085_init_client(data);
if (err < 0)
- goto exit_free;
+ goto exit_free_irq;
err = bmp085_detect(dev);
if (err < 0) {
dev_err(dev, "%s: chip_id failed!\n", BMP085_NAME);
- goto exit_free;
+ goto exit_free_irq;
}
/* Register sysfs hooks */
err = sysfs_create_group(&dev->kobj, &bmp085_attr_group);
if (err)
- goto exit_free;
+ goto exit_free_irq;
dev_info(dev, "Successfully initialized %s!\n", BMP085_NAME);
return 0;
+exit_free_irq:
+ if (data->irq)
+ free_irq(data->irq, data);
exit_free:
kfree(data);
exit:
@@ -466,6 +517,9 @@ int bmp085_remove(struct device *dev)
{
struct bmp085_data *data = dev_get_drvdata(dev);
+ if (data->irq)
+ free_irq(data->irq, data);
+
sysfs_remove_group(&data->dev->kobj, &bmp085_attr_group);
kfree(data);
diff --git a/include/linux/i2c/bmp085.h b/include/linux/i2c/bmp085.h
new file mode 100644
index 0000000..b66cb98
--- /dev/null
+++ b/include/linux/i2c/bmp085.h
@@ -0,0 +1,17 @@
+#ifndef __LINUX_I2C_BMP085_H
+#define __LINUX_I2C_BMP085_H
+
+/* linux/i2c/bmp085.h */
+
+/*
+ * bmp085 platform data
+ * @gpio: if is set it is the End Of Conversion line which is high when
+ * conversion is finished
+ * @irq: if gpio < 0 and irq > 0, then it is an interrupt with no gpio
+ */
+struct bmp085_platform_data {
+ int gpio;
+ int irq;
+};
+
+#endif
--
1.8.1.2
--
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