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path: root/drivers/w1/masters/w1-gpio.c
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Diffstat (limited to 'drivers/w1/masters/w1-gpio.c')
-rw-r--r--drivers/w1/masters/w1-gpio.c65
1 files changed, 33 insertions, 32 deletions
diff --git a/drivers/w1/masters/w1-gpio.c b/drivers/w1/masters/w1-gpio.c
index 6012c4ea320..85b363a5bd0 100644
--- a/drivers/w1/masters/w1-gpio.c
+++ b/drivers/w1/masters/w1-gpio.c
@@ -16,6 +16,9 @@
#include <linux/gpio.h>
#include <linux/of_platform.h>
#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"
@@ -44,7 +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" },
{}
@@ -55,11 +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)
@@ -74,41 +71,53 @@ 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)
{
struct w1_bus_master *master;
struct w1_gpio_platform_data *pdata;
+ struct pinctrl *pinctrl;
int err;
- err = w1_gpio_probe_dt(pdev);
- if (err < 0)
- return err;
+ pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
+ if (IS_ERR(pinctrl))
+ dev_warn(&pdev->dev, "unable to select pin group\n");
+
+ 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;
@@ -123,8 +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);
@@ -198,23 +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@sci.fi>");