linux/drivers/gpio/gpio-moxart.c

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/*
* MOXA ART SoCs GPIO driver.
*
* Copyright (C) 2013 Jonas Jensen
*
* Jonas Jensen <jonas.jensen@gmail.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/err.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/platform_device.h>
#include <linux/of_address.h>
#include <linux/of_gpio.h>
#include <linux/pinctrl/consumer.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/bitops.h>
gpio: generic: factor into gpio_chip struct The separate struct bgpio_chip has been a pain to handle, both by being confusingly similar in name to struct gpio_chip and for being contained inside a struct so that struct gpio_chip is contained in a struct contained in a struct, making several steps of dereferencing necessary. Make things simpler: include the fields directly into <linux/gpio/driver.h>, #ifdef:ed for CONFIG_GENERIC_GPIO, and get rid of the <linux/basic_mmio_gpio.h> altogether. Prefix some of the member variables with bgpio_* and add proper kerneldoc while we're at it. Modify all users to handle the change and use a struct gpio_chip directly. And while we're at it: replace all container_of() dereferencing by gpiochip_get_data() and registering the gpio_chip with gpiochip_add_data(). Cc: arm@kernel.org Cc: Alexander Shiyan <shc_work@mail.ru> Cc: Shawn Guo <shawnguo@kernel.org> Cc: Sascha Hauer <kernel@pengutronix.de> Cc: Kukjin Kim <kgene@kernel.org> Cc: Alexandre Courbot <gnurou@gmail.com> Cc: Brian Norris <computersforpeace@gmail.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Sudeep Holla <sudeep.holla@arm.com> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Nicolas Pitre <nicolas.pitre@linaro.org> Cc: Olof Johansson <olof@lixom.net> Cc: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Cc: Rabin Vincent <rabin@rab.in> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-omap@vger.kernel.org Cc: linux-samsung-soc@vger.kernel.org Cc: bcm-kernel-feedback-list@broadcom.com Acked-by: Gregory Fong <gregory.0xf0@gmail.com> Acked-by: Liviu Dudau <Liviu.Dudau@arm.com> Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2015-12-04 16:02:58 +03:00
#include <linux/gpio/driver.h>
#define GPIO_DATA_OUT 0x00
#define GPIO_DATA_IN 0x04
#define GPIO_PIN_DIRECTION 0x08
static int moxart_gpio_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct resource *res;
gpio: generic: factor into gpio_chip struct The separate struct bgpio_chip has been a pain to handle, both by being confusingly similar in name to struct gpio_chip and for being contained inside a struct so that struct gpio_chip is contained in a struct contained in a struct, making several steps of dereferencing necessary. Make things simpler: include the fields directly into <linux/gpio/driver.h>, #ifdef:ed for CONFIG_GENERIC_GPIO, and get rid of the <linux/basic_mmio_gpio.h> altogether. Prefix some of the member variables with bgpio_* and add proper kerneldoc while we're at it. Modify all users to handle the change and use a struct gpio_chip directly. And while we're at it: replace all container_of() dereferencing by gpiochip_get_data() and registering the gpio_chip with gpiochip_add_data(). Cc: arm@kernel.org Cc: Alexander Shiyan <shc_work@mail.ru> Cc: Shawn Guo <shawnguo@kernel.org> Cc: Sascha Hauer <kernel@pengutronix.de> Cc: Kukjin Kim <kgene@kernel.org> Cc: Alexandre Courbot <gnurou@gmail.com> Cc: Brian Norris <computersforpeace@gmail.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Sudeep Holla <sudeep.holla@arm.com> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Nicolas Pitre <nicolas.pitre@linaro.org> Cc: Olof Johansson <olof@lixom.net> Cc: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Cc: Rabin Vincent <rabin@rab.in> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-omap@vger.kernel.org Cc: linux-samsung-soc@vger.kernel.org Cc: bcm-kernel-feedback-list@broadcom.com Acked-by: Gregory Fong <gregory.0xf0@gmail.com> Acked-by: Liviu Dudau <Liviu.Dudau@arm.com> Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2015-12-04 16:02:58 +03:00
struct gpio_chip *gc;
void __iomem *base;
int ret;
gpio: generic: factor into gpio_chip struct The separate struct bgpio_chip has been a pain to handle, both by being confusingly similar in name to struct gpio_chip and for being contained inside a struct so that struct gpio_chip is contained in a struct contained in a struct, making several steps of dereferencing necessary. Make things simpler: include the fields directly into <linux/gpio/driver.h>, #ifdef:ed for CONFIG_GENERIC_GPIO, and get rid of the <linux/basic_mmio_gpio.h> altogether. Prefix some of the member variables with bgpio_* and add proper kerneldoc while we're at it. Modify all users to handle the change and use a struct gpio_chip directly. And while we're at it: replace all container_of() dereferencing by gpiochip_get_data() and registering the gpio_chip with gpiochip_add_data(). Cc: arm@kernel.org Cc: Alexander Shiyan <shc_work@mail.ru> Cc: Shawn Guo <shawnguo@kernel.org> Cc: Sascha Hauer <kernel@pengutronix.de> Cc: Kukjin Kim <kgene@kernel.org> Cc: Alexandre Courbot <gnurou@gmail.com> Cc: Brian Norris <computersforpeace@gmail.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Sudeep Holla <sudeep.holla@arm.com> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Nicolas Pitre <nicolas.pitre@linaro.org> Cc: Olof Johansson <olof@lixom.net> Cc: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Cc: Rabin Vincent <rabin@rab.in> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-omap@vger.kernel.org Cc: linux-samsung-soc@vger.kernel.org Cc: bcm-kernel-feedback-list@broadcom.com Acked-by: Gregory Fong <gregory.0xf0@gmail.com> Acked-by: Liviu Dudau <Liviu.Dudau@arm.com> Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL);
if (!gc)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
gpio: generic: factor into gpio_chip struct The separate struct bgpio_chip has been a pain to handle, both by being confusingly similar in name to struct gpio_chip and for being contained inside a struct so that struct gpio_chip is contained in a struct contained in a struct, making several steps of dereferencing necessary. Make things simpler: include the fields directly into <linux/gpio/driver.h>, #ifdef:ed for CONFIG_GENERIC_GPIO, and get rid of the <linux/basic_mmio_gpio.h> altogether. Prefix some of the member variables with bgpio_* and add proper kerneldoc while we're at it. Modify all users to handle the change and use a struct gpio_chip directly. And while we're at it: replace all container_of() dereferencing by gpiochip_get_data() and registering the gpio_chip with gpiochip_add_data(). Cc: arm@kernel.org Cc: Alexander Shiyan <shc_work@mail.ru> Cc: Shawn Guo <shawnguo@kernel.org> Cc: Sascha Hauer <kernel@pengutronix.de> Cc: Kukjin Kim <kgene@kernel.org> Cc: Alexandre Courbot <gnurou@gmail.com> Cc: Brian Norris <computersforpeace@gmail.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Sudeep Holla <sudeep.holla@arm.com> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Nicolas Pitre <nicolas.pitre@linaro.org> Cc: Olof Johansson <olof@lixom.net> Cc: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Cc: Rabin Vincent <rabin@rab.in> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-omap@vger.kernel.org Cc: linux-samsung-soc@vger.kernel.org Cc: bcm-kernel-feedback-list@broadcom.com Acked-by: Gregory Fong <gregory.0xf0@gmail.com> Acked-by: Liviu Dudau <Liviu.Dudau@arm.com> Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2015-12-04 16:02:58 +03:00
ret = bgpio_init(gc, dev, 4, base + GPIO_DATA_IN,
base + GPIO_DATA_OUT, NULL,
base + GPIO_PIN_DIRECTION, NULL,
BGPIOF_READ_OUTPUT_REG_SET);
if (ret) {
dev_err(&pdev->dev, "bgpio_init failed\n");
return ret;
}
gpio: generic: factor into gpio_chip struct The separate struct bgpio_chip has been a pain to handle, both by being confusingly similar in name to struct gpio_chip and for being contained inside a struct so that struct gpio_chip is contained in a struct contained in a struct, making several steps of dereferencing necessary. Make things simpler: include the fields directly into <linux/gpio/driver.h>, #ifdef:ed for CONFIG_GENERIC_GPIO, and get rid of the <linux/basic_mmio_gpio.h> altogether. Prefix some of the member variables with bgpio_* and add proper kerneldoc while we're at it. Modify all users to handle the change and use a struct gpio_chip directly. And while we're at it: replace all container_of() dereferencing by gpiochip_get_data() and registering the gpio_chip with gpiochip_add_data(). Cc: arm@kernel.org Cc: Alexander Shiyan <shc_work@mail.ru> Cc: Shawn Guo <shawnguo@kernel.org> Cc: Sascha Hauer <kernel@pengutronix.de> Cc: Kukjin Kim <kgene@kernel.org> Cc: Alexandre Courbot <gnurou@gmail.com> Cc: Brian Norris <computersforpeace@gmail.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: Sudeep Holla <sudeep.holla@arm.com> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Nicolas Pitre <nicolas.pitre@linaro.org> Cc: Olof Johansson <olof@lixom.net> Cc: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Cc: Rabin Vincent <rabin@rab.in> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-omap@vger.kernel.org Cc: linux-samsung-soc@vger.kernel.org Cc: bcm-kernel-feedback-list@broadcom.com Acked-by: Gregory Fong <gregory.0xf0@gmail.com> Acked-by: Liviu Dudau <Liviu.Dudau@arm.com> Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Acked-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2015-12-04 16:02:58 +03:00
gc->label = "moxart-gpio";
gc->request = gpiochip_generic_request;
gc->free = gpiochip_generic_free;
gc->base = 0;
gc->owner = THIS_MODULE;
ret = devm_gpiochip_add_data(dev, gc, NULL);
if (ret) {
dev_err(dev, "%s: gpiochip_add failed\n",
dev->of_node->full_name);
return ret;
}
return ret;
}
static const struct of_device_id moxart_gpio_match[] = {
{ .compatible = "moxa,moxart-gpio" },
{ }
};
static struct platform_driver moxart_gpio_driver = {
.driver = {
.name = "moxart-gpio",
.of_match_table = moxart_gpio_match,
},
.probe = moxart_gpio_probe,
};
builtin_platform_driver(moxart_gpio_driver);