Commit d2323cf7 authored by Daniel Mack's avatar Daniel Mack Committed by Greg Kroah-Hartman
Browse files

onewire: w1-gpio: add ext_pullup_enable pin in platform data 



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: default avatarDaniel Mack <zonque@gmail.com>
Acked-by: default avatarEvgeniy Polyakov <zbr@ioremap.net>
Acked-by: default avatarVille Syrjälä <syrjala@sci.fi>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5f3d1382

drivers/w1/masters/w1-gpio.c

+17 −1
Original line number Diff line number Diff line
@@ -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);

include/linux/w1-gpio.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */

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