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Date: Thu, 14 Nov 2013 22:46:48 +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 2/3] misc: bmp085: Add DT bindings for EOC gpio line and direct irq.
Signed-off-by: Marek Belisko <marek@...delico.com>
---
Documentation/devicetree/bindings/misc/bmp085.txt | 8 ++++
drivers/misc/bmp085.c | 53 ++++++++++++++++++++---
2 files changed, 55 insertions(+), 6 deletions(-)
diff --git a/Documentation/devicetree/bindings/misc/bmp085.txt b/Documentation/devicetree/bindings/misc/bmp085.txt
index 91dfda2..c6033d5 100644
--- a/Documentation/devicetree/bindings/misc/bmp085.txt
+++ b/Documentation/devicetree/bindings/misc/bmp085.txt
@@ -8,6 +8,9 @@ Optional properties:
- temp-measurement-period: temperature measurement period (milliseconds)
- default-oversampling: default oversampling value to be used at startup,
value range is 0-3 with rising sensitivity.
+- gpio: if device is using EOC irq line gpio can be specified to setup interrupt
+ handling
+- irq: interrupt with no gpio
Example:
@@ -17,4 +20,9 @@ pressure@77 {
chip-id = <10>;
temp-measurement-period = <100>;
default-oversampling = <2>;
+ gpio = <&gpio0 17 0>;
+
+ OR
+
+ irq = <75>;
};
diff --git a/drivers/misc/bmp085.c b/drivers/misc/bmp085.c
index 1510a7b..9792ce2 100644
--- a/drivers/misc/bmp085.c
+++ b/drivers/misc/bmp085.c
@@ -50,6 +50,7 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/of.h>
+#include <linux/of_gpio.h>
#include "bmp085.h"
#include <linux/interrupt.h>
#include <linux/completion.h>
@@ -396,7 +397,8 @@ int bmp085_detect(struct device *dev)
}
EXPORT_SYMBOL_GPL(bmp085_detect);
-static void bmp085_get_of_properties(struct bmp085_data *data)
+static void bmp085_get_of_properties(struct bmp085_data *data,
+ struct bmp085_platform_data *pdata)
{
#ifdef CONFIG_OF
struct device_node *np = data->dev->of_node;
@@ -413,12 +415,18 @@ static void bmp085_get_of_properties(struct bmp085_data *data)
if (!of_property_read_u32(np, "default-oversampling", &prop))
data->oversampling_setting = prop & 0xff;
+
+ pdata->gpio = of_get_named_gpio(np, "gpio", 0);
+ of_property_read_u32(np, "irq", &pdata->irq);
#endif
}
-static int bmp085_init_client(struct bmp085_data *data)
+static int bmp085_init_client(struct device *dev, struct bmp085_data *data)
{
int status = bmp085_read_calibration_data(data);
+ struct bmp085_platform_data *pdata = dev->platform_data;
+ struct device_node *node = dev->of_node;
+ int err;
if (status < 0)
return status;
@@ -429,11 +437,46 @@ static int bmp085_init_client(struct bmp085_data *data)
data->temp_measurement_period = 1*HZ;
data->oversampling_setting = 3;
- bmp085_get_of_properties(data);
+ /* parse DT to get platform data */
+ if (node && !pdata) {
+ pdata = devm_kzalloc(dev, sizeof(struct bmp085_platform_data),
+ GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+ }
+
+ bmp085_get_of_properties(data, pdata);
+
+ if (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->irq > 0)
+ 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;
+ }
mutex_init(&data->lock);
return 0;
+
+exit_free:
+ return err;
}
struct regmap_config bmp085_regmap_config = {
@@ -445,7 +488,6 @@ 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);
@@ -484,7 +526,7 @@ int bmp085_probe(struct device *dev, struct regmap *regmap)
data->irq = 0;
/* Initialize the BMP085 chip */
- err = bmp085_init_client(data);
+ err = bmp085_init_client(dev, data);
if (err < 0)
goto exit_free_irq;
@@ -506,7 +548,6 @@ int bmp085_probe(struct device *dev, struct regmap *regmap)
exit_free_irq:
if (data->irq)
free_irq(data->irq, data);
-exit_free:
kfree(data);
exit:
return err;
--
1.8.1.2
--
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