0f4630f372
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>
114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
/*
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* Driver for GE FPGA based GPIO
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*
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* Author: Martyn Welch <martyn.welch@ge.com>
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*
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* 2008 (c) GE Intelligent Platforms Embedded Systems, Inc.
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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/* TODO
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*
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* Configuration of output modes (totem-pole/open-drain)
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* Interrupt configuration - interrupts are always generated the FPGA relies on
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* the I/O interrupt controllers mask to stop them propergating
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*/
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/of_device.h>
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#include <linux/of_gpio.h>
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#include <linux/of_address.h>
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#include <linux/module.h>
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#include <linux/gpio/driver.h>
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#define GEF_GPIO_DIRECT 0x00
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#define GEF_GPIO_IN 0x04
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#define GEF_GPIO_OUT 0x08
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#define GEF_GPIO_TRIG 0x0C
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#define GEF_GPIO_POLAR_A 0x10
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#define GEF_GPIO_POLAR_B 0x14
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#define GEF_GPIO_INT_STAT 0x18
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#define GEF_GPIO_OVERRUN 0x1C
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#define GEF_GPIO_MODE 0x20
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static const struct of_device_id gef_gpio_ids[] = {
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{
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.compatible = "gef,sbc610-gpio",
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.data = (void *)19,
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}, {
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.compatible = "gef,sbc310-gpio",
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.data = (void *)6,
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}, {
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.compatible = "ge,imp3a-gpio",
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.data = (void *)16,
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},
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{ }
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};
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MODULE_DEVICE_TABLE(of, gef_gpio_ids);
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static int __init gef_gpio_probe(struct platform_device *pdev)
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{
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const struct of_device_id *of_id =
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of_match_device(gef_gpio_ids, &pdev->dev);
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struct gpio_chip *gc;
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void __iomem *regs;
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int ret;
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gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
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if (!gc)
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return -ENOMEM;
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regs = of_iomap(pdev->dev.of_node, 0);
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if (!regs)
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return -ENOMEM;
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ret = bgpio_init(gc, &pdev->dev, 4, regs + GEF_GPIO_IN,
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regs + GEF_GPIO_OUT, NULL, NULL,
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regs + GEF_GPIO_DIRECT, BGPIOF_BIG_ENDIAN_BYTE_ORDER);
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if (ret) {
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dev_err(&pdev->dev, "bgpio_init failed\n");
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goto err0;
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}
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/* Setup pointers to chip functions */
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gc->label = devm_kstrdup(&pdev->dev, pdev->dev.of_node->full_name,
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GFP_KERNEL);
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if (!gc->label) {
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ret = -ENOMEM;
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goto err0;
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}
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gc->base = -1;
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gc->ngpio = (u16)(uintptr_t)of_id->data;
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gc->of_gpio_n_cells = 2;
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gc->of_node = pdev->dev.of_node;
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/* This function adds a memory mapped GPIO chip */
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ret = gpiochip_add_data(gc, NULL);
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if (ret)
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goto err0;
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return 0;
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err0:
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iounmap(regs);
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pr_err("%s: GPIO chip registration failed\n",
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pdev->dev.of_node->full_name);
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return ret;
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};
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static struct platform_driver gef_gpio_driver = {
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.driver = {
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.name = "gef-gpio",
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.of_match_table = gef_gpio_ids,
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},
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};
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module_platform_driver_probe(gef_gpio_driver, gef_gpio_probe);
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MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");
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MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
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MODULE_LICENSE("GPL");
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