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Subject[PATCH 1/2] onewire: w1-gpio: add ext_pullup_enable pin in platform data
Date
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>
Cc: Evgeniy Polyakov <zbr@ioremap.net>
Cc: Ville Syrjala <syrjala@sci.fi>
---
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 df600d1..dac88ff 100644
--- a/drivers/w1/masters/w1-gpio.c
+++ b/drivers/w1/masters/w1-gpio.c
@@ -59,6 +59,13 @@ 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;

@@ -72,15 +79,21 @@ 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:
@@ -97,6 +110,9 @@ 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 3adeff8..065e3ae 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 */
--
1.7.10.4


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