forked from luck/tmp_suning_uos_patched
b1bf7d4d1b
Lots of gpio changes, both to core code and drivers. Changes do touch architecture code to remove the need for separate arm/gpio.h includes in most architectures. Some new drivers are added, and a number of gpio drivers are converted to use irq_domains for gpio inputs used as interrupts. Device tree support has been amended to allow multiple gpio_chips to use the same device tree node. Remaining changes are primarily bug fixes. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAABAgAGBQJPvpFBAAoJEEFnBt12D9kB50EP/0q2co+Ddlz4DWM07TLMgTw8 eCSi79+oB85RcE+0FlAo/SJu9VlYDKSLT3wMbIyycfJi3cUtOb+hay0j+wxcn4bz G2qXj2Het5rX6hFI2tSCvJfDqMwU0wEygn9a6a/bw3VGSOIVmMTmRswrbbBcFzVu 8xobviN7LANLEZyhd4Ip5YfrcWH9ABmmhZX7ihn1AJubVL47xGo0uds9ZFX1sAKB Zyr80+BeUK7mhZ74UUfQHtS+x24JD62OLM9eaQN0/BBAqBewQJlxhMakPbTGmcuO Vy3CPmZiWw6tdVWgKvxE7cIXLI4YbB2B6w2TRJBBkFAlz4RsO2bFU/ibEv1vg9YE oxAUelMj0INdY4iRT135fDJTIGauWon22Tqd2MVtun4r6fwcL0BgFYN6yCMtEqbx bpYkKTi6tdyE7k2Ph+carCIuw9SwOk/4pm1xCWC0k6YdAnRE0zykCLvAuAabpmzs i/H1jcp/F4KSYldEoDlGYG4lFZiISthxOy9l6/d4GrBj723attrmztolMfrpFLF6 XPTf7HODQFmZ6n7mBIjCg4hoqydAYyKcW7lROc7DKkEXIWOeeeA+EoTytkwPLLz5 CBLoZfDoqUT8xa2vv4MZ/+G9chSDi5vMryqEYi9tXMbVEZW31xqh6hxk0xPMcY13 qVAaRlcz49AQjWq/0vR4 =U6hj -----END PGP SIGNATURE----- Merge tag 'gpio-for-linus' of git://git.secretlab.ca/git/linux-2.6 Pull GPIO driver changes from Grant Likely: "Lots of gpio changes, both to core code and drivers. Changes do touch architecture code to remove the need for separate arm/gpio.h includes in most architectures. Some new drivers are added, and a number of gpio drivers are converted to use irq_domains for gpio inputs used as interrupts. Device tree support has been amended to allow multiple gpio_chips to use the same device tree node. Remaining changes are primarily bug fixes." * tag 'gpio-for-linus' of git://git.secretlab.ca/git/linux-2.6: (33 commits) gpio/generic: initialize basic_mmio_gpio shadow variables properly gpiolib: Remove 'const' from data argument of gpiochip_find() gpio/rc5t583: add gpio driver for RICOH PMIC RC5T583 gpiolib: quiet gpiochip_add boot message noise gpio: mpc8xxx: Prevent NULL pointer deref in demux handler gpio/lpc32xx: Add device tree support gpio: Adjust of_xlate API to support multiple GPIO chips gpiolib: Implement devm_gpio_request_one() gpio-mcp23s08: dbg_show: fix pullup configuration display Add support for TCA6424A gpio/omap: (re)fix wakeups on level-triggered GPIOs gpio/omap: fix broken context restore for non-OFF mode transitions gpio/omap: fix missing check in *_runtime_suspend() gpio/omap: remove cpu_is_omapxxxx() checks from *_runtime_resume() gpio/omap: remove suspend/resume callbacks gpio/omap: remove retrigger variable in gpio_irq_handler gpio/omap: remove saved_wakeup field from struct gpio_bank gpio/omap: remove suspend_wakeup field from struct gpio_bank gpio/omap: remove saved_fallingdetect, saved_risingdetect gpio/omap: remove virtual_irq_start variable ... Conflicts: drivers/gpio/gpio-samsung.c
119 lines
2.9 KiB
C
119 lines
2.9 KiB
C
/*
|
|
* drivers/gpio/devres.c - managed gpio resources
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
* This file is based on kernel/irq/devres.c
|
|
*
|
|
* Copyright (c) 2011 John Crispin <blogic@openwrt.org>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/device.h>
|
|
#include <linux/gfp.h>
|
|
|
|
static void devm_gpio_release(struct device *dev, void *res)
|
|
{
|
|
unsigned *gpio = res;
|
|
|
|
gpio_free(*gpio);
|
|
}
|
|
|
|
static int devm_gpio_match(struct device *dev, void *res, void *data)
|
|
{
|
|
unsigned *this = res, *gpio = data;
|
|
|
|
return *this == *gpio;
|
|
}
|
|
|
|
/**
|
|
* devm_gpio_request - request a gpio for a managed device
|
|
* @dev: device to request the gpio for
|
|
* @gpio: gpio to allocate
|
|
* @label: the name of the requested gpio
|
|
*
|
|
* Except for the extra @dev argument, this function takes the
|
|
* same arguments and performs the same function as
|
|
* gpio_request(). GPIOs requested with this function will be
|
|
* automatically freed on driver detach.
|
|
*
|
|
* If an GPIO allocated with this function needs to be freed
|
|
* separately, devm_gpio_free() must be used.
|
|
*/
|
|
|
|
int devm_gpio_request(struct device *dev, unsigned gpio, const char *label)
|
|
{
|
|
unsigned *dr;
|
|
int rc;
|
|
|
|
dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
|
|
if (!dr)
|
|
return -ENOMEM;
|
|
|
|
rc = gpio_request(gpio, label);
|
|
if (rc) {
|
|
devres_free(dr);
|
|
return rc;
|
|
}
|
|
|
|
*dr = gpio;
|
|
devres_add(dev, dr);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(devm_gpio_request);
|
|
|
|
/**
|
|
* devm_gpio_request_one - request a single GPIO with initial setup
|
|
* @dev: device to request for
|
|
* @gpio: the GPIO number
|
|
* @flags: GPIO configuration as specified by GPIOF_*
|
|
* @label: a literal description string of this GPIO
|
|
*/
|
|
int devm_gpio_request_one(struct device *dev, unsigned gpio,
|
|
unsigned long flags, const char *label)
|
|
{
|
|
unsigned *dr;
|
|
int rc;
|
|
|
|
dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
|
|
if (!dr)
|
|
return -ENOMEM;
|
|
|
|
rc = gpio_request_one(gpio, flags, label);
|
|
if (rc) {
|
|
devres_free(dr);
|
|
return rc;
|
|
}
|
|
|
|
*dr = gpio;
|
|
devres_add(dev, dr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* devm_gpio_free - free an interrupt
|
|
* @dev: device to free gpio for
|
|
* @gpio: gpio to free
|
|
*
|
|
* Except for the extra @dev argument, this function takes the
|
|
* same arguments and performs the same function as gpio_free().
|
|
* This function instead of gpio_free() should be used to manually
|
|
* free GPIOs allocated with devm_gpio_request().
|
|
*/
|
|
void devm_gpio_free(struct device *dev, unsigned int gpio)
|
|
{
|
|
|
|
WARN_ON(devres_release(dev, devm_gpio_release, devm_gpio_match,
|
|
&gpio));
|
|
}
|
|
EXPORT_SYMBOL(devm_gpio_free);
|