diff options
Diffstat (limited to 'drivers/w1/masters/w1-gpio.c')
| -rw-r--r-- | drivers/w1/masters/w1-gpio.c | 65 |
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>"); |