[linux-2.6-block.git] / drivers / net / phy / mdio-mux-gpio.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2011, 2012 Cavium, Inc.
 */

#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/of_mdio.h>
#include <linux/module.h>
#include <linux/phy.h>
#include <linux/mdio-mux.h>
#include <linux/gpio/consumer.h>

#define DRV_VERSION "1.1"
#define DRV_DESCRIPTION "GPIO controlled MDIO bus multiplexer driver"

struct mdio_mux_gpio_state {
	struct gpio_descs *gpios;
	void *mux_handle;
};

static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
				   void *data)
{
	struct mdio_mux_gpio_state *s = data;
	int values[s->gpios->ndescs];
	unsigned int n;

	if (current_child == desired_child)
		return 0;

	for (n = 0; n < s->gpios->ndescs; n++)
		values[n] = (desired_child >> n) & 1;

	gpiod_set_array_cansleep(s->gpios->ndescs, s->gpios->desc, values);

	return 0;
}

static int mdio_mux_gpio_probe(struct platform_device *pdev)
{
	struct mdio_mux_gpio_state *s;
	int r;

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

	s->gpios = gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW);
	if (IS_ERR(s->gpios))
		return PTR_ERR(s->gpios);

	r = mdio_mux_init(&pdev->dev,
			  mdio_mux_gpio_switch_fn, &s->mux_handle, s);

	if (r != 0) {
		gpiod_put_array(s->gpios);
		return r;
	}

	pdev->dev.platform_data = s;
	return 0;
}

static int mdio_mux_gpio_remove(struct platform_device *pdev)
{
	struct mdio_mux_gpio_state *s = dev_get_platdata(&pdev->dev);
	mdio_mux_uninit(s->mux_handle);
	gpiod_put_array(s->gpios);
	return 0;
}

static const struct of_device_id mdio_mux_gpio_match[] = {
	{
		.compatible = "mdio-mux-gpio",
	},
	{
		/* Legacy compatible property. */
		.compatible = "cavium,mdio-mux-sn74cbtlv3253",
	},
	{},
};
MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match);

static struct platform_driver mdio_mux_gpio_driver = {
	.driver = {
		.name		= "mdio-mux-gpio",
		.of_match_table = mdio_mux_gpio_match,
	},
	.probe		= mdio_mux_gpio_probe,
	.remove		= mdio_mux_gpio_remove,
};

module_platform_driver(mdio_mux_gpio_driver);

MODULE_DESCRIPTION(DRV_DESCRIPTION);
MODULE_VERSION(DRV_VERSION);
MODULE_AUTHOR("David Daney");
MODULE_LICENSE("GPL");
Commit	Line	Data
416912a1 DD	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 2011, 2012 Cavium, Inc.
	7	*/
	8
	9	#include <linux/platform_device.h>
	10	#include <linux/device.h>
	11	#include <linux/of_mdio.h>
	12	#include <linux/module.h>
416912a1 DD	13	#include <linux/phy.h>
416912a1 DD	14	#include <linux/mdio-mux.h>
33df10e2	15	#include <linux/gpio/consumer.h>
416912a1	16
441e0026	17	#define DRV_VERSION "1.1"
416912a1 DD	18	#define DRV_DESCRIPTION "GPIO controlled MDIO bus multiplexer driver"
416912a1 DD	19
416912a1	20	struct mdio_mux_gpio_state {
33df10e2	21	struct gpio_descs *gpios;
416912a1 DD	22	void *mux_handle;
	23	};
	24
	25	static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
	26	void *data)
	27	{
416912a1	28	struct mdio_mux_gpio_state *s = data;
33df10e2 RI	29	int values[s->gpios->ndescs];
33df10e2 RI	30	unsigned int n;
416912a1 DD	31
	32	if (current_child == desired_child)
	33	return 0;
	34
33df10e2	35	for (n = 0; n < s->gpios->ndescs; n++)
441e0026	36	values[n] = (desired_child >> n) & 1;
33df10e2 RI	37
33df10e2 RI	38	gpiod_set_array_cansleep(s->gpios->ndescs, s->gpios->desc, values);
416912a1 DD	39
	40	return 0;
	41	}
	42
633d1594	43	static int mdio_mux_gpio_probe(struct platform_device *pdev)
416912a1	44	{
416912a1	45	struct mdio_mux_gpio_state *s;
416912a1 DD	46	int r;
416912a1 DD	47
416912a1 DD	48	s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
	49	if (!s)
	50	return -ENOMEM;
	51
33df10e2 RI	52	s->gpios = gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW);
	53	if (IS_ERR(s->gpios))
	54	return PTR_ERR(s->gpios);
416912a1 DD	55
	56	r = mdio_mux_init(&pdev->dev,
	57	mdio_mux_gpio_switch_fn, &s->mux_handle, s);
	58
33df10e2 RI	59	if (r != 0) {
	60	gpiod_put_array(s->gpios);
	61	return r;
416912a1	62	}
33df10e2 RI	63
	64	pdev->dev.platform_data = s;
	65	return 0;
416912a1 DD	66	}
416912a1 DD	67
633d1594	68	static int mdio_mux_gpio_remove(struct platform_device *pdev)
416912a1	69	{
1b0e53a8	70	struct mdio_mux_gpio_state *s = dev_get_platdata(&pdev->dev);
416912a1	71	mdio_mux_uninit(s->mux_handle);
33df10e2	72	gpiod_put_array(s->gpios);
416912a1 DD	73	return 0;
	74	}
	75
d8a7dadb	76	static const struct of_device_id mdio_mux_gpio_match[] = {
416912a1 DD	77	{
	78	.compatible = "mdio-mux-gpio",
	79	},
	80	{
	81	/* Legacy compatible property. */
	82	.compatible = "cavium,mdio-mux-sn74cbtlv3253",
	83	},
	84	{},
	85	};
	86	MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match);
	87
	88	static struct platform_driver mdio_mux_gpio_driver = {
	89	.driver = {
	90	.name = "mdio-mux-gpio",
416912a1 DD	91	.of_match_table = mdio_mux_gpio_match,
	92	},
	93	.probe = mdio_mux_gpio_probe,
633d1594	94	.remove = mdio_mux_gpio_remove,
416912a1 DD	95	};
	96
	97	module_platform_driver(mdio_mux_gpio_driver);
	98
	99	MODULE_DESCRIPTION(DRV_DESCRIPTION);
	100	MODULE_VERSION(DRV_VERSION);
	101	MODULE_AUTHOR("David Daney");
	102	MODULE_LICENSE("GPL");