diff options
Diffstat (limited to 'drivers/of/gpio.c')
| -rw-r--r-- | drivers/of/gpio.c | 244 |
1 files changed, 0 insertions, 244 deletions
diff --git a/drivers/of/gpio.c b/drivers/of/gpio.c deleted file mode 100644 index 905960338fb..00000000000 --- a/drivers/of/gpio.c +++ /dev/null @@ -1,244 +0,0 @@ -/* - * OF helpers for the GPIO API - * - * Copyright (c) 2007-2008 MontaVista Software, Inc. - * - * Author: Anton Vorontsov <avorontsov@ru.mvista.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - */ - -#include <linux/device.h> -#include <linux/errno.h> -#include <linux/module.h> -#include <linux/io.h> -#include <linux/of.h> -#include <linux/of_address.h> -#include <linux/of_gpio.h> -#include <linux/slab.h> - -/** - * of_get_gpio_flags - Get a GPIO number and flags to use with GPIO API - * @np: device node to get GPIO from - * @index: index of the GPIO - * @flags: a flags pointer to fill in - * - * Returns GPIO number to use with Linux generic GPIO API, or one of the errno - * value on the error condition. If @flags is not NULL the function also fills - * in flags for the GPIO. - */ -int of_get_gpio_flags(struct device_node *np, int index, - enum of_gpio_flags *flags) -{ - int ret; - struct device_node *gpio_np; - struct gpio_chip *gc; - int size; - const void *gpio_spec; - const __be32 *gpio_cells; - - ret = of_parse_phandles_with_args(np, "gpios", "#gpio-cells", index, - &gpio_np, &gpio_spec); - if (ret) { - pr_debug("%s: can't parse gpios property\n", __func__); - goto err0; - } - - gc = of_node_to_gpiochip(gpio_np); - if (!gc) { - pr_debug("%s: gpio controller %s isn't registered\n", - np->full_name, gpio_np->full_name); - ret = -ENODEV; - goto err1; - } - - gpio_cells = of_get_property(gpio_np, "#gpio-cells", &size); - if (!gpio_cells || size != sizeof(*gpio_cells) || - be32_to_cpup(gpio_cells) != gc->of_gpio_n_cells) { - pr_debug("%s: wrong #gpio-cells for %s\n", - np->full_name, gpio_np->full_name); - ret = -EINVAL; - goto err1; - } - - /* .xlate might decide to not fill in the flags, so clear it. */ - if (flags) - *flags = 0; - - ret = gc->of_xlate(gc, np, gpio_spec, flags); - if (ret < 0) - goto err1; - - ret += gc->base; -err1: - of_node_put(gpio_np); -err0: - pr_debug("%s exited with status %d\n", __func__, ret); - return ret; -} -EXPORT_SYMBOL(of_get_gpio_flags); - -/** - * of_gpio_count - Count GPIOs for a device - * @np: device node to count GPIOs for - * - * The function returns the count of GPIOs specified for a node. - * - * Note that the empty GPIO specifiers counts too. For example, - * - * gpios = <0 - * &pio1 1 2 - * 0 - * &pio2 3 4>; - * - * defines four GPIOs (so this function will return 4), two of which - * are not specified. - */ -unsigned int of_gpio_count(struct device_node *np) -{ - unsigned int cnt = 0; - - do { - int ret; - - ret = of_parse_phandles_with_args(np, "gpios", "#gpio-cells", - cnt, NULL, NULL); - /* A hole in the gpios = <> counts anyway. */ - if (ret < 0 && ret != -EEXIST) - break; - } while (++cnt); - - return cnt; -} -EXPORT_SYMBOL(of_gpio_count); - -/** - * of_gpio_simple_xlate - translate gpio_spec to the GPIO number and flags - * @gc: pointer to the gpio_chip structure - * @np: device node of the GPIO chip - * @gpio_spec: gpio specifier as found in the device tree - * @flags: a flags pointer to fill in - * - * This is simple translation function, suitable for the most 1:1 mapped - * gpio chips. This function performs only one sanity check: whether gpio - * is less than ngpios (that is specified in the gpio_chip). - */ -static int of_gpio_simple_xlate(struct gpio_chip *gc, struct device_node *np, - const void *gpio_spec, u32 *flags) -{ - const __be32 *gpio = gpio_spec; - const u32 n = be32_to_cpup(gpio); - - /* - * We're discouraging gpio_cells < 2, since that way you'll have to - * write your own xlate function (that will have to retrive the GPIO - * number and the flags from a single gpio cell -- this is possible, - * but not recommended). - */ - if (gc->of_gpio_n_cells < 2) { - WARN_ON(1); - return -EINVAL; - } - - if (n > gc->ngpio) - return -EINVAL; - - if (flags) - *flags = be32_to_cpu(gpio[1]); - - return n; -} - -/** - * of_mm_gpiochip_add - Add memory mapped GPIO chip (bank) - * @np: device node of the GPIO chip - * @mm_gc: pointer to the of_mm_gpio_chip allocated structure - * - * To use this function you should allocate and fill mm_gc with: - * - * 1) In the gpio_chip structure: - * - all the callbacks - * - of_gpio_n_cells - * - of_xlate callback (optional) - * - * 3) In the of_mm_gpio_chip structure: - * - save_regs callback (optional) - * - * If succeeded, this function will map bank's memory and will - * do all necessary work for you. Then you'll able to use .regs - * to manage GPIOs from the callbacks. - */ -int of_mm_gpiochip_add(struct device_node *np, - struct of_mm_gpio_chip *mm_gc) -{ - int ret = -ENOMEM; - struct gpio_chip *gc = &mm_gc->gc; - - gc->label = kstrdup(np->full_name, GFP_KERNEL); - if (!gc->label) - goto err0; - - mm_gc->regs = of_iomap(np, 0); - if (!mm_gc->regs) - goto err1; - - gc->base = -1; - - if (mm_gc->save_regs) - mm_gc->save_regs(mm_gc); - - mm_gc->gc.of_node = np; - - ret = gpiochip_add(gc); - if (ret) - goto err2; - - pr_debug("%s: registered as generic GPIO chip, base is %d\n", - np->full_name, gc->base); - return 0; -err2: - iounmap(mm_gc->regs); -err1: - kfree(gc->label); -err0: - pr_err("%s: GPIO chip registration failed with status %d\n", - np->full_name, ret); - return ret; -} -EXPORT_SYMBOL(of_mm_gpiochip_add); - -void of_gpiochip_add(struct gpio_chip *chip) -{ - if ((!chip->of_node) && (chip->dev)) - chip->of_node = chip->dev->of_node; - - if (!chip->of_node) - return; - - if (!chip->of_xlate) { - chip->of_gpio_n_cells = 2; - chip->of_xlate = of_gpio_simple_xlate; - } - - of_node_get(chip->of_node); -} - -void of_gpiochip_remove(struct gpio_chip *chip) -{ - if (chip->of_node) - of_node_put(chip->of_node); -} - -/* Private function for resolving node pointer to gpio_chip */ -static int of_gpiochip_is_match(struct gpio_chip *chip, void *data) -{ - return chip->of_node == data; -} - -struct gpio_chip *of_node_to_gpiochip(struct device_node *np) -{ - return gpiochip_find(np, of_gpiochip_is_match); -} |