diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/w1/masters/w1-gpio.c | 18 |
1 files changed, 17 insertions, 1 deletions
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); |