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mfd/gpio: add a GPIO interface to the UCB1400 MFD chip driver via gpi…
…olib Cc: Eric Miao <[email protected]> Cc: Russell King <[email protected]> Cc: David Brownell <[email protected]> Cc: Samuel Ortiz <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,125 @@ | ||
| /* | ||
| * Philips UCB1400 GPIO driver | ||
| * | ||
| * Author: Marek Vasut <[email protected]> | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License version 2 as | ||
| * published by the Free Software Foundation. | ||
| * | ||
| */ | ||
|
|
||
| #include <linux/module.h> | ||
| #include <linux/ucb1400.h> | ||
|
|
||
| struct ucb1400_gpio_data *ucbdata; | ||
|
|
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| static int ucb1400_gpio_dir_in(struct gpio_chip *gc, unsigned off) | ||
| { | ||
| struct ucb1400_gpio *gpio; | ||
| gpio = container_of(gc, struct ucb1400_gpio, gc); | ||
| ucb1400_gpio_set_direction(gpio->ac97, off, 0); | ||
| return 0; | ||
| } | ||
|
|
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| static int ucb1400_gpio_dir_out(struct gpio_chip *gc, unsigned off, int val) | ||
| { | ||
| struct ucb1400_gpio *gpio; | ||
| gpio = container_of(gc, struct ucb1400_gpio, gc); | ||
| ucb1400_gpio_set_direction(gpio->ac97, off, 1); | ||
| ucb1400_gpio_set_value(gpio->ac97, off, val); | ||
| return 0; | ||
| } | ||
|
|
||
| static int ucb1400_gpio_get(struct gpio_chip *gc, unsigned off) | ||
| { | ||
| struct ucb1400_gpio *gpio; | ||
| gpio = container_of(gc, struct ucb1400_gpio, gc); | ||
| return ucb1400_gpio_get_value(gpio->ac97, off); | ||
| } | ||
|
|
||
| static void ucb1400_gpio_set(struct gpio_chip *gc, unsigned off, int val) | ||
| { | ||
| struct ucb1400_gpio *gpio; | ||
| gpio = container_of(gc, struct ucb1400_gpio, gc); | ||
| ucb1400_gpio_set_value(gpio->ac97, off, val); | ||
| } | ||
|
|
||
| static int ucb1400_gpio_probe(struct platform_device *dev) | ||
| { | ||
| struct ucb1400_gpio *ucb = dev->dev.platform_data; | ||
| int err = 0; | ||
|
|
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| if (!(ucbdata && ucbdata->gpio_offset)) { | ||
| err = -EINVAL; | ||
| goto err; | ||
| } | ||
|
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| platform_set_drvdata(dev, ucb); | ||
|
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| ucb->gc.label = "ucb1400_gpio"; | ||
| ucb->gc.base = ucbdata->gpio_offset; | ||
| ucb->gc.ngpio = 10; | ||
| ucb->gc.owner = THIS_MODULE; | ||
|
|
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| ucb->gc.direction_input = ucb1400_gpio_dir_in; | ||
| ucb->gc.direction_output = ucb1400_gpio_dir_out; | ||
| ucb->gc.get = ucb1400_gpio_get; | ||
| ucb->gc.set = ucb1400_gpio_set; | ||
| ucb->gc.can_sleep = 1; | ||
|
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| err = gpiochip_add(&ucb->gc); | ||
| if (err) | ||
| goto err; | ||
|
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| if (ucbdata && ucbdata->gpio_setup) | ||
| err = ucbdata->gpio_setup(&dev->dev, ucb->gc.ngpio); | ||
|
|
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| err: | ||
| return err; | ||
|
|
||
| } | ||
|
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| static int ucb1400_gpio_remove(struct platform_device *dev) | ||
| { | ||
| int err = 0; | ||
| struct ucb1400_gpio *ucb = platform_get_drvdata(dev); | ||
|
|
||
| if (ucbdata && ucbdata->gpio_teardown) { | ||
| err = ucbdata->gpio_teardown(&dev->dev, ucb->gc.ngpio); | ||
| if (err) | ||
| return err; | ||
| } | ||
|
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| err = gpiochip_remove(&ucb->gc); | ||
| return err; | ||
| } | ||
|
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| static struct platform_driver ucb1400_gpio_driver = { | ||
| .probe = ucb1400_gpio_probe, | ||
| .remove = ucb1400_gpio_remove, | ||
| .driver = { | ||
| .name = "ucb1400_gpio" | ||
| }, | ||
| }; | ||
|
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| static int __init ucb1400_gpio_init(void) | ||
| { | ||
| return platform_driver_register(&ucb1400_gpio_driver); | ||
| } | ||
|
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| static void __exit ucb1400_gpio_exit(void) | ||
| { | ||
| platform_driver_unregister(&ucb1400_gpio_driver); | ||
| } | ||
|
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| void __init ucb1400_gpio_set_data(struct ucb1400_gpio_data *data) | ||
| { | ||
| ucbdata = data; | ||
| } | ||
|
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| module_init(ucb1400_gpio_init); | ||
| module_exit(ucb1400_gpio_exit); | ||
|
|
||
| MODULE_DESCRIPTION("Philips UCB1400 GPIO driver"); | ||
| MODULE_LICENSE("GPL"); |
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