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Date: Wed, 31 Oct 2012 17:57:44 +0200
From: Pantelis Antoniou <panto@...oniou-consulting.com>
To: Evgeniy Polyakov <zbr@...emap.net>
Cc: Pantelis Antoniou <panto@...oniou-consulting.com>,
linux-kernel@...r.kernel.org,
Koen Kooi <koen@...inion.thruhere.net>,
Matt Porter <mporter@...com>, Russ Dill <Russ.Dill@...com>,
linux-omap@...r.kernel.org
Subject: [PATCH] w1-gpio: Simplify & get rid of defines
There's no reason to have the OF defines; it complicates the driver.
There's also no need for the funky platform_driver_probe.
Add a few warnings in case there's a failure; helps us find out
what went wrong.
Signed-off-by: Pantelis Antoniou <panto@...oniou-consulting.com>
---
drivers/w1/masters/w1-gpio.c | 58 ++++++++++++++++++++------------------------
1 file changed, 26 insertions(+), 32 deletions(-)
diff --git a/drivers/w1/masters/w1-gpio.c b/drivers/w1/masters/w1-gpio.c
index aec35bd..85b363a 100644
--- a/drivers/w1/masters/w1-gpio.c
+++ b/drivers/w1/masters/w1-gpio.c
@@ -18,6 +18,7 @@
#include <linux/of_gpio.h>
#include <linux/pinctrl/consumer.h>
#include <linux/err.h>
+#include <linux/of.h>
#include "../w1.h"
#include "../w1_int.h"
@@ -46,7 +47,6 @@ static u8 w1_gpio_read_bit(void *data)
return gpio_get_value(pdata->pin) ? 1 : 0;
}
-#ifdef CONFIG_OF
static struct of_device_id w1_gpio_dt_ids[] = {
{ .compatible = "w1-gpio" },
{}
@@ -57,11 +57,6 @@ static int w1_gpio_probe_dt(struct platform_device *pdev)
{
struct w1_gpio_platform_data *pdata = pdev->dev.platform_data;
struct device_node *np = pdev->dev.of_node;
- const struct of_device_id *of_id =
- of_match_device(w1_gpio_dt_ids, &pdev->dev);
-
- if (!of_id)
- return 0;
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
@@ -76,12 +71,6 @@ static int w1_gpio_probe_dt(struct platform_device *pdev)
return 0;
}
-#else
-static int w1_gpio_probe_dt(struct platform_device *pdev)
-{
- return 0;
-}
-#endif
static int __init w1_gpio_probe(struct platform_device *pdev)
{
@@ -94,28 +83,41 @@ static int __init w1_gpio_probe(struct platform_device *pdev)
if (IS_ERR(pinctrl))
dev_warn(&pdev->dev, "unable to select pin group\n");
- err = w1_gpio_probe_dt(pdev);
- if (err < 0)
- return err;
+ if (of_have_populated_dt()) {
+ err = w1_gpio_probe_dt(pdev);
+ if (err < 0) {
+ dev_err(&pdev->dev, "Failed to parse DT\n");
+ return err;
+ }
+ }
pdata = pdev->dev.platform_data;
- if (!pdata)
+ if (!pdata) {
+ dev_err(&pdev->dev, "No configuration data\n");
return -ENXIO;
+ }
master = kzalloc(sizeof(struct w1_bus_master), GFP_KERNEL);
- if (!master)
+ if (!master) {
+ dev_err(&pdev->dev, "Out of memory\n");
return -ENOMEM;
+ }
err = gpio_request(pdata->pin, "w1");
- if (err)
+ if (err) {
+ dev_err(&pdev->dev, "gpio_request (pin) failed\n");
goto free_master;
+ }
if (gpio_is_valid(pdata->ext_pullup_enable_pin)) {
err = gpio_request_one(pdata->ext_pullup_enable_pin,
GPIOF_INIT_LOW, "w1 pullup");
- if (err < 0)
+ if (err < 0) {
+ dev_err(&pdev->dev, "gpio_request_one "
+ "(ext_pullup_enable_pin) failed\n");
goto free_gpio;
+ }
}
master->data = pdata;
@@ -130,8 +132,10 @@ static int __init w1_gpio_probe(struct platform_device *pdev)
}
err = w1_add_master_device(master);
- if (err)
+ if (err) {
+ dev_err(&pdev->dev, "w1_add_master device failed\n");
goto free_gpio_ext_pu;
+ }
if (pdata->enable_external_pullup)
pdata->enable_external_pullup(1);
@@ -205,23 +209,13 @@ static struct platform_driver w1_gpio_driver = {
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(w1_gpio_dt_ids),
},
+ .probe = w1_gpio_probe,
.remove = __exit_p(w1_gpio_remove),
.suspend = w1_gpio_suspend,
.resume = w1_gpio_resume,
};
-static int __init w1_gpio_init(void)
-{
- return platform_driver_probe(&w1_gpio_driver, w1_gpio_probe);
-}
-
-static void __exit w1_gpio_exit(void)
-{
- platform_driver_unregister(&w1_gpio_driver);
-}
-
-module_init(w1_gpio_init);
-module_exit(w1_gpio_exit);
+module_platform_driver(w1_gpio_driver);
MODULE_DESCRIPTION("GPIO w1 bus master driver");
MODULE_AUTHOR("Ville Syrjala <syrjala@....fi>");
--
1.7.12
--
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