Release 4.14 drivers/gpio/gpio-ge.c

/*
 * Driver for GE FPGA based GPIO
 *
 * Author: Martyn Welch <martyn.welch@ge.com>
 *
 * 2008 (c) GE Intelligent Platforms Embedded Systems, Inc.
 *
 * 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.
 */

/* TODO
 *
 * Configuration of output modes (totem-pole/open-drain)
 * Interrupt configuration - interrupts are always generated the FPGA relies on
 * the I/O interrupt controllers mask to stop them propergating
 */

#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/of_address.h>
#include <linux/module.h>
#include <linux/gpio/driver.h>


#define GEF_GPIO_DIRECT		0x00

#define GEF_GPIO_IN		0x04

#define GEF_GPIO_OUT		0x08

#define GEF_GPIO_TRIG		0x0C

#define GEF_GPIO_POLAR_A	0x10

#define GEF_GPIO_POLAR_B	0x14

#define GEF_GPIO_INT_STAT	0x18

#define GEF_GPIO_OVERRUN	0x1C

#define GEF_GPIO_MODE		0x20


static const struct of_device_id gef_gpio_ids[] = {
	{
		.compatible	= "gef,sbc610-gpio",
		.data		= (void *)19,
        }, {
		.compatible	= "gef,sbc310-gpio",
		.data		= (void *)6,
        }, {
		.compatible	= "ge,imp3a-gpio",
		.data		= (void *)16,
        },
	{ }
};
MODULE_DEVICE_TABLE(of, gef_gpio_ids);



static int __init gef_gpio_probe(struct platform_device *pdev)
{
	const struct of_device_id *of_id =
		of_match_device(gef_gpio_ids, &pdev->dev);
	struct gpio_chip *gc;
	void __iomem *regs;
	int ret;

	gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
	if (!gc)
		return -ENOMEM;

	regs = of_iomap(pdev->dev.of_node, 0);
	if (!regs)
		return -ENOMEM;

	ret = bgpio_init(gc, &pdev->dev, 4, regs + GEF_GPIO_IN,
			 regs + GEF_GPIO_OUT, NULL, NULL,
			 regs + GEF_GPIO_DIRECT, BGPIOF_BIG_ENDIAN_BYTE_ORDER);
	if (ret) {
		dev_err(&pdev->dev, "bgpio_init failed\n");
		goto err0;
	}

	/* Setup pointers to chip functions */
	gc->label = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOF", pdev->dev.of_node);
	if (!gc->label) {
		ret = -ENOMEM;
		goto err0;
	}

	gc->base = -1;
	gc->ngpio = (u16)(uintptr_t)of_id->data;
	gc->of_gpio_n_cells = 2;
	gc->of_node = pdev->dev.of_node;

	/* This function adds a memory mapped GPIO chip */
	ret = devm_gpiochip_add_data(&pdev->dev, gc, NULL);
	if (ret)
		goto err0;

	return 0;
err0:
	iounmap(regs);
	pr_err("%pOF: GPIO chip registration failed\n", pdev->dev.of_node);
	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Kamlakant Patel
136
51.52%
1
11.11%
Alexander Shiyan
47
17.80%
1
11.11%
Martyn Welch
42
15.91%
3
33.33%
Linus Walleij
14
5.30%
1
11.11%
Axel Lin
13
4.92%
1
11.11%
Laxman Dewangan
6
2.27%
1
11.11%
Rob Herring
6
2.27%
1
11.11%
Total
264
100.00%
9
100.00%

;


static struct platform_driver gef_gpio_driver = {
	.driver = {
		.name		= "gef-gpio",
		.of_match_table	= gef_gpio_ids,
        },
};
module_platform_driver_probe(gef_gpio_driver, gef_gpio_probe);

MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");
MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
MODULE_LICENSE("GPL");
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Kamlakant Patel
144
32.95%
2
15.38%
Martyn Welch
135
30.89%
5
38.46%
Alexander Shiyan
117
26.77%
1
7.69%
Linus Walleij
15
3.43%
1
7.69%
Axel Lin
13
2.97%
1
7.69%
Laxman Dewangan
6
1.37%
1
7.69%
Rob Herring
6
1.37%
1
7.69%
Paul Gortmaker
1
0.23%
1
7.69%
Total
437
100.00%
13
100.00%
Directory: drivers/gpio

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