diff options
| author | Daniel Mack <zonque@gmail.com> | 2012-07-25 22:54:29 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-08-16 10:02:33 -0700 |
| commit | d2323cf77308d6aa13a3a5287310ef93c4919d1e (patch) | |
| tree | df5fa99b5a9376386ed8deb842da90277f5cef53 | |
| parent | 5f3d1382e3ca39a54032784414f0ad4e7078b37e (diff) | |
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: Daniel Mack <zonque@gmail.com>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Acked-by: Ville Syrjälä <syrjala@sci.fi>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/w1/masters/w1-gpio.c | 18 | ||||
| -rw-r--r-- | include/linux/w1-gpio.h | 1 |
2 files changed, 18 insertions, 1 deletions
diff --git a/drivers/w1/masters/w1-gpio.c b/drivers/w1/masters/w1-gpio.c index f01c336233d..6012c4ea320 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 3adeff82212..065e3ae79ab 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 */ |