From d2323cf77308d6aa13a3a5287310ef93c4919d1e Mon Sep 17 00:00:00 2001 From: Daniel Mack Date: Wed, 25 Jul 2012 22:54:29 +0200 Subject: [PATCH] onewire: w1-gpio: add ext_pullup_enable pin in platform data MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit In the process of porting boards to devicetree implemenation, we should keep information about external circuitry where they belong - the individual drivers. This patch adds a way to specify a GPIO to drive the (optional) external pull-up logic, rather than using a function pointer for that. Signed-off-by: Daniel Mack Acked-by: Evgeniy Polyakov Acked-by: Ville Syrjälä Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- drivers/w1/masters/w1-gpio.c | 18 +++++++++++++++++- include/linux/w1-gpio.h | 1 + 2 files changed, 18 insertions(+), 1 deletion(-) diff --git a/drivers/w1/masters/w1-gpio.c b/drivers/w1/masters/w1-gpio.c index f01c336233da..6012c4ea3206 100644 --- a/drivers/w1/masters/w1-gpio.c +++ b/drivers/w1/masters/w1-gpio.c @@ -104,6 +104,13 @@ static int __init w1_gpio_probe(struct platform_device *pdev) if (err) 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) + goto free_gpio; + } + master->data = pdata; master->read_bit = w1_gpio_read_bit; @@ -117,15 +124,21 @@ static int __init w1_gpio_probe(struct platform_device *pdev) err = w1_add_master_device(master); if (err) - goto free_gpio; + goto free_gpio_ext_pu; if (pdata->enable_external_pullup) pdata->enable_external_pullup(1); + if (gpio_is_valid(pdata->ext_pullup_enable_pin)) + gpio_set_value(pdata->ext_pullup_enable_pin, 1); + platform_set_drvdata(pdev, master); return 0; + free_gpio_ext_pu: + if (gpio_is_valid(pdata->ext_pullup_enable_pin)) + gpio_free(pdata->ext_pullup_enable_pin); free_gpio: gpio_free(pdata->pin); free_master: @@ -142,6 +155,9 @@ static int __exit w1_gpio_remove(struct platform_device *pdev) if (pdata->enable_external_pullup) pdata->enable_external_pullup(0); + if (gpio_is_valid(pdata->ext_pullup_enable_pin)) + gpio_set_value(pdata->ext_pullup_enable_pin, 0); + w1_remove_master_device(master); gpio_free(pdata->pin); kfree(master); diff --git a/include/linux/w1-gpio.h b/include/linux/w1-gpio.h index 3adeff82212f..065e3ae79ab0 100644 --- a/include/linux/w1-gpio.h +++ b/include/linux/w1-gpio.h @@ -19,6 +19,7 @@ struct w1_gpio_platform_data { unsigned int pin; unsigned int is_open_drain:1; void (*enable_external_pullup)(int enable); + unsigned int ext_pullup_enable_pin; }; #endif /* _LINUX_W1_GPIO_H */