[mirror_ubuntu-bionic-kernel.git] / drivers / usb / misc / usb3503.c

/*
 * Driver for SMSC USB3503 USB 2.0 hub controller driver
 *
 * Copyright (c) 2012-2013 Dongjin Kim (tobetter@gmail.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * 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
 */

#include <linux/clk.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/platform_data/usb3503.h>
#include <linux/regmap.h>

#define USB3503_VIDL		0x00
#define USB3503_VIDM		0x01
#define USB3503_PIDL		0x02
#define USB3503_PIDM		0x03
#define USB3503_DIDL		0x04
#define USB3503_DIDM		0x05

#define USB3503_CFG1		0x06
#define USB3503_SELF_BUS_PWR	(1 << 7)

#define USB3503_CFG2		0x07
#define USB3503_CFG3		0x08
#define USB3503_NRD		0x09

#define USB3503_PDS		0x0a

#define USB3503_SP_ILOCK	0xe7
#define USB3503_SPILOCK_CONNECT	(1 << 1)
#define USB3503_SPILOCK_CONFIG	(1 << 0)

#define USB3503_CFGP		0xee
#define USB3503_CLKSUSP		(1 << 7)

#define USB3503_RESET		0xff

struct usb3503 {
	enum usb3503_mode	mode;
	struct regmap		*regmap;
	struct device		*dev;
	struct clk		*clk;
	u8	port_off_mask;
	int	gpio_intn;
	int	gpio_reset;
	int	gpio_connect;
	bool	secondary_ref_clk;
};

static int usb3503_reset(struct usb3503 *hub, int state)
{
	if (!state && gpio_is_valid(hub->gpio_connect))
		gpio_set_value_cansleep(hub->gpio_connect, 0);

	if (gpio_is_valid(hub->gpio_reset))
		gpio_set_value_cansleep(hub->gpio_reset, state);

	/* Wait T_HUBINIT == 4ms for hub logic to stabilize */
	if (state)
		usleep_range(4000, 10000);

	return 0;
}

static int usb3503_connect(struct usb3503 *hub)
{
	struct device *dev = hub->dev;
	int err;

	usb3503_reset(hub, 1);

	if (hub->regmap) {
		/* SP_ILOCK: set connect_n, config_n for config */
		err = regmap_write(hub->regmap, USB3503_SP_ILOCK,
			   (USB3503_SPILOCK_CONNECT
				 | USB3503_SPILOCK_CONFIG));
		if (err < 0) {
			dev_err(dev, "SP_ILOCK failed (%d)\n", err);
			return err;
		}

		/* PDS : Disable For Self Powered Operation */
		if (hub->port_off_mask) {
			err = regmap_update_bits(hub->regmap, USB3503_PDS,
					hub->port_off_mask,
					hub->port_off_mask);
			if (err < 0) {
				dev_err(dev, "PDS failed (%d)\n", err);
				return err;
			}
		}

		/* CFG1 : SELF_BUS_PWR -> Self-Powerd operation */
		err = regmap_update_bits(hub->regmap, USB3503_CFG1,
					 USB3503_SELF_BUS_PWR,
					 USB3503_SELF_BUS_PWR);
		if (err < 0) {
			dev_err(dev, "CFG1 failed (%d)\n", err);
			return err;
		}

		/* SP_LOCK: clear connect_n, config_n for hub connect */
		err = regmap_update_bits(hub->regmap, USB3503_SP_ILOCK,
					 (USB3503_SPILOCK_CONNECT
					  | USB3503_SPILOCK_CONFIG), 0);
		if (err < 0) {
			dev_err(dev, "SP_ILOCK failed (%d)\n", err);
			return err;
		}
	}

	if (gpio_is_valid(hub->gpio_connect))
		gpio_set_value_cansleep(hub->gpio_connect, 1);

	hub->mode = USB3503_MODE_HUB;
	dev_info(dev, "switched to HUB mode\n");

	return 0;
}

static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode)
{
	struct device *dev = hub->dev;
	int err = 0;

	switch (mode) {
	case USB3503_MODE_HUB:
		err = usb3503_connect(hub);
		break;

	case USB3503_MODE_STANDBY:
		usb3503_reset(hub, 0);
		dev_info(dev, "switched to STANDBY mode\n");
		break;

	default:
		dev_err(dev, "unknown mode is requested\n");
		err = -EINVAL;
		break;
	}

	return err;
}

static const struct regmap_config usb3503_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = USB3503_RESET,
};

static int usb3503_probe(struct usb3503 *hub)
{
	struct device *dev = hub->dev;
	struct usb3503_platform_data *pdata = dev_get_platdata(dev);
	struct device_node *np = dev->of_node;
	int err;
	u32 mode = USB3503_MODE_HUB;
	const u32 *property;
	int len;

	if (pdata) {
		hub->port_off_mask	= pdata->port_off_mask;
		hub->gpio_intn		= pdata->gpio_intn;
		hub->gpio_connect	= pdata->gpio_connect;
		hub->gpio_reset		= pdata->gpio_reset;
		hub->mode		= pdata->initial_mode;
	} else if (np) {
		struct clk *clk;
		hub->port_off_mask = 0;

		clk = devm_clk_get(dev, "refclk");
		if (IS_ERR(clk) && PTR_ERR(clk) != -ENOENT) {
			dev_err(dev, "unable to request refclk (%ld)\n",
					PTR_ERR(clk));
			return PTR_ERR(clk);
		}

		if (!IS_ERR(clk)) {
			u32 rate = 0;
			hub->clk = clk;

			if (!of_property_read_u32(np, "refclk-frequency",
						 &rate)) {

				switch (rate) {
				case 38400000:
				case 26000000:
				case 19200000:
				case 12000000:
					hub->secondary_ref_clk = 0;
					break;
				case 24000000:
				case 27000000:
				case 25000000:
				case 50000000:
					hub->secondary_ref_clk = 1;
					break;
				default:
					dev_err(dev,
						"unsupported reference clock rate (%d)\n",
						(int) rate);
					return -EINVAL;
				}
				err = clk_set_rate(hub->clk, rate);
				if (err) {
					dev_err(dev,
						"unable to set reference clock rate to %d\n",
						(int) rate);
					return err;
				}
			}

			err = clk_prepare_enable(hub->clk);
			if (err) {
				dev_err(dev,
					"unable to enable reference clock\n");
				return err;
			}
		}

		property = of_get_property(np, "disabled-ports", &len);
		if (property && (len / sizeof(u32)) > 0) {
			int i;
			for (i = 0; i < len / sizeof(u32); i++) {
				u32 port = be32_to_cpu(property[i]);
				if ((1 <= port) && (port <= 3))
					hub->port_off_mask |= (1 << port);
			}
		}

		hub->gpio_intn	= of_get_named_gpio(np, "intn-gpios", 0);
		if (hub->gpio_intn == -EPROBE_DEFER)
			return -EPROBE_DEFER;
		hub->gpio_connect = of_get_named_gpio(np, "connect-gpios", 0);
		if (hub->gpio_connect == -EPROBE_DEFER)
			return -EPROBE_DEFER;
		hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0);
		if (hub->gpio_reset == -EPROBE_DEFER)
			return -EPROBE_DEFER;
		of_property_read_u32(np, "initial-mode", &mode);
		hub->mode = mode;
	}

	if (hub->port_off_mask && !hub->regmap)
		dev_err(dev, "Ports disabled with no control interface\n");

	if (gpio_is_valid(hub->gpio_intn)) {
		int val = hub->secondary_ref_clk ? GPIOF_OUT_INIT_LOW :
						   GPIOF_OUT_INIT_HIGH;
		err = devm_gpio_request_one(dev, hub->gpio_intn, val,
					    "usb3503 intn");
		if (err) {
			dev_err(dev,
				"unable to request GPIO %d as connect pin (%d)\n",
				hub->gpio_intn, err);
			return err;
		}
	}

	if (gpio_is_valid(hub->gpio_connect)) {
		err = devm_gpio_request_one(dev, hub->gpio_connect,
				GPIOF_OUT_INIT_LOW, "usb3503 connect");
		if (err) {
			dev_err(dev,
				"unable to request GPIO %d as connect pin (%d)\n",
				hub->gpio_connect, err);
			return err;
		}
	}

	if (gpio_is_valid(hub->gpio_reset)) {
		err = devm_gpio_request_one(dev, hub->gpio_reset,
				GPIOF_OUT_INIT_LOW, "usb3503 reset");
		if (err) {
			dev_err(dev,
				"unable to request GPIO %d as reset pin (%d)\n",
				hub->gpio_reset, err);
			return err;
		}
	}

	usb3503_switch_mode(hub, hub->mode);

	dev_info(dev, "%s: probed in %s mode\n", __func__,
			(hub->mode == USB3503_MODE_HUB) ? "hub" : "standby");

	return 0;
}

static int usb3503_i2c_probe(struct i2c_client *i2c,
			     const struct i2c_device_id *id)
{
	struct usb3503 *hub;
	int err;

	hub = devm_kzalloc(&i2c->dev, sizeof(struct usb3503), GFP_KERNEL);
	if (!hub) {
		dev_err(&i2c->dev, "private data alloc fail\n");
		return -ENOMEM;
	}

	i2c_set_clientdata(i2c, hub);
	hub->regmap = devm_regmap_init_i2c(i2c, &usb3503_regmap_config);
	if (IS_ERR(hub->regmap)) {
		err = PTR_ERR(hub->regmap);
		dev_err(&i2c->dev, "Failed to initialise regmap: %d\n", err);
		return err;
	}
	hub->dev = &i2c->dev;

	return usb3503_probe(hub);
}

static int usb3503_platform_probe(struct platform_device *pdev)
{
	struct usb3503 *hub;

	hub = devm_kzalloc(&pdev->dev, sizeof(struct usb3503), GFP_KERNEL);
	if (!hub) {
		dev_err(&pdev->dev, "private data alloc fail\n");
		return -ENOMEM;
	}
	hub->dev = &pdev->dev;

	return usb3503_probe(hub);
}

#ifdef CONFIG_PM_SLEEP
static int usb3503_i2c_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct usb3503 *hub = i2c_get_clientdata(client);

	usb3503_switch_mode(hub, USB3503_MODE_STANDBY);

	if (hub->clk)
		clk_disable_unprepare(hub->clk);

	return 0;
}

static int usb3503_i2c_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct usb3503 *hub = i2c_get_clientdata(client);

	if (hub->clk)
		clk_prepare_enable(hub->clk);

	usb3503_switch_mode(hub, hub->mode);

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(usb3503_i2c_pm_ops, usb3503_i2c_suspend,
		usb3503_i2c_resume);

static const struct i2c_device_id usb3503_id[] = {
	{ USB3503_I2C_NAME, 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, usb3503_id);

#ifdef CONFIG_OF
static const struct of_device_id usb3503_of_match[] = {
	{ .compatible = "smsc,usb3503", },
	{ .compatible = "smsc,usb3503a", },
	{},
};
MODULE_DEVICE_TABLE(of, usb3503_of_match);
#endif

static struct i2c_driver usb3503_i2c_driver = {
	.driver = {
		.name = USB3503_I2C_NAME,
		.pm = &usb3503_i2c_pm_ops,
		.of_match_table = of_match_ptr(usb3503_of_match),
	},
	.probe		= usb3503_i2c_probe,
	.id_table	= usb3503_id,
};

static struct platform_driver usb3503_platform_driver = {
	.driver = {
		.name = USB3503_I2C_NAME,
		.of_match_table = of_match_ptr(usb3503_of_match),
		.owner = THIS_MODULE,
	},
	.probe		= usb3503_platform_probe,
};

static int __init usb3503_init(void)
{
	int err;

	err = i2c_register_driver(THIS_MODULE, &usb3503_i2c_driver);
	if (err != 0)
		pr_err("usb3503: Failed to register I2C driver: %d\n", err);

	err = platform_driver_register(&usb3503_platform_driver);
	if (err != 0)
		pr_err("usb3503: Failed to register platform driver: %d\n",
		       err);

	return 0;
}
module_init(usb3503_init);

static void __exit usb3503_exit(void)
{
	platform_driver_unregister(&usb3503_platform_driver);
	i2c_del_driver(&usb3503_i2c_driver);
}
module_exit(usb3503_exit);

MODULE_AUTHOR("Dongjin Kim <tobetter@gmail.com>");
MODULE_DESCRIPTION("USB3503 USB HUB driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
6a099c63 DK	1	/*
	2	* Driver for SMSC USB3503 USB 2.0 hub controller driver
	3	*
	4	* Copyright (c) 2012-2013 Dongjin Kim (tobetter@gmail.com)
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20
657d898a	21	#include <linux/clk.h>
6a099c63 DK	22	#include <linux/i2c.h>
	23	#include <linux/gpio.h>
	24	#include <linux/delay.h>
	25	#include <linux/slab.h>
	26	#include <linux/module.h>
eab8050c	27	#include <linux/of_gpio.h>
6a099c63 DK	28	#include <linux/platform_device.h>
6a099c63 DK	29	#include <linux/platform_data/usb3503.h>
68b14134	30	#include <linux/regmap.h>
6a099c63 DK	31
	32	#define USB3503_VIDL 0x00
	33	#define USB3503_VIDM 0x01
	34	#define USB3503_PIDL 0x02
	35	#define USB3503_PIDM 0x03
	36	#define USB3503_DIDL 0x04
	37	#define USB3503_DIDM 0x05
	38
	39	#define USB3503_CFG1 0x06
	40	#define USB3503_SELF_BUS_PWR (1 << 7)
	41
	42	#define USB3503_CFG2 0x07
	43	#define USB3503_CFG3 0x08
	44	#define USB3503_NRD 0x09
	45
	46	#define USB3503_PDS 0x0a
6a099c63 DK	47
	48	#define USB3503_SP_ILOCK 0xe7
	49	#define USB3503_SPILOCK_CONNECT (1 << 1)
	50	#define USB3503_SPILOCK_CONFIG (1 << 0)
	51
	52	#define USB3503_CFGP 0xee
	53	#define USB3503_CLKSUSP (1 << 7)
	54
68b14134 MB	55	#define USB3503_RESET 0xff
68b14134 MB	56
6a099c63 DK	57	struct usb3503 {
6a099c63 DK	58	enum usb3503_mode mode;
68b14134 MB	59	struct regmap *regmap;
68b14134 MB	60	struct device *dev;
657d898a	61	struct clk *clk;
e8e44a48	62	u8 port_off_mask;
6a099c63 DK	63	int gpio_intn;
	64	int gpio_reset;
	65	int gpio_connect;
657d898a	66	bool secondary_ref_clk;
6a099c63 DK	67	};
6a099c63 DK	68
8e7245b8	69	static int usb3503_reset(struct usb3503 *hub, int state)
6a099c63	70	{
8e7245b8 MB	71	if (!state && gpio_is_valid(hub->gpio_connect))
	72	gpio_set_value_cansleep(hub->gpio_connect, 0);
	73
	74	if (gpio_is_valid(hub->gpio_reset))
	75	gpio_set_value_cansleep(hub->gpio_reset, state);
6a099c63	76
06a962fa	77	/* Wait T_HUBINIT == 4ms for hub logic to stabilize */
6a099c63	78	if (state)
06a962fa	79	usleep_range(4000, 10000);
6a099c63 DK	80
	81	return 0;
	82	}
	83
3f0d1c67	84	static int usb3503_connect(struct usb3503 *hub)
6a099c63	85	{
68b14134	86	struct device *dev = hub->dev;
3f0d1c67	87	int err;
6a099c63	88
3f0d1c67	89	usb3503_reset(hub, 1);
6a099c63	90
3f0d1c67	91	if (hub->regmap) {
6a099c63	92	/* SP_ILOCK: set connect_n, config_n for config */
68b14134	93	err = regmap_write(hub->regmap, USB3503_SP_ILOCK,
3f0d1c67	94	(USB3503_SPILOCK_CONNECT
6a099c63 DK	95	\| USB3503_SPILOCK_CONFIG));
6a099c63 DK	96	if (err < 0) {
68b14134	97	dev_err(dev, "SP_ILOCK failed (%d)\n", err);
3f0d1c67	98	return err;
6a099c63 DK	99	}
6a099c63 DK	100
e8e44a48 DK	101	/* PDS : Disable For Self Powered Operation */
e8e44a48 DK	102	if (hub->port_off_mask) {
68b14134 MB	103	err = regmap_update_bits(hub->regmap, USB3503_PDS,
68b14134 MB	104	hub->port_off_mask,
e8e44a48 DK	105	hub->port_off_mask);
e8e44a48 DK	106	if (err < 0) {
68b14134	107	dev_err(dev, "PDS failed (%d)\n", err);
3f0d1c67	108	return err;
e8e44a48	109	}
6a099c63 DK	110	}
	111
	112	/* CFG1 : SELF_BUS_PWR -> Self-Powerd operation */
68b14134 MB	113	err = regmap_update_bits(hub->regmap, USB3503_CFG1,
	114	USB3503_SELF_BUS_PWR,
	115	USB3503_SELF_BUS_PWR);
6a099c63	116	if (err < 0) {
68b14134	117	dev_err(dev, "CFG1 failed (%d)\n", err);
3f0d1c67	118	return err;
6a099c63 DK	119	}
	120
	121	/* SP_LOCK: clear connect_n, config_n for hub connect */
68b14134 MB	122	err = regmap_update_bits(hub->regmap, USB3503_SP_ILOCK,
	123	(USB3503_SPILOCK_CONNECT
	124	\| USB3503_SPILOCK_CONFIG), 0);
6a099c63	125	if (err < 0) {
68b14134	126	dev_err(dev, "SP_ILOCK failed (%d)\n", err);
3f0d1c67	127	return err;
6a099c63	128	}
3f0d1c67	129	}
6a099c63	130
3f0d1c67 MB	131	if (gpio_is_valid(hub->gpio_connect))
3f0d1c67 MB	132	gpio_set_value_cansleep(hub->gpio_connect, 1);
8e7245b8	133
3f0d1c67 MB	134	hub->mode = USB3503_MODE_HUB;
	135	dev_info(dev, "switched to HUB mode\n");
	136
	137	return 0;
	138	}
	139
	140	static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode)
	141	{
	142	struct device *dev = hub->dev;
	143	int err = 0;
	144
	145	switch (mode) {
	146	case USB3503_MODE_HUB:
	147	err = usb3503_connect(hub);
6a099c63 DK	148	break;
	149
	150	case USB3503_MODE_STANDBY:
8e7245b8	151	usb3503_reset(hub, 0);
68b14134	152	dev_info(dev, "switched to STANDBY mode\n");
6a099c63 DK	153	break;
	154
	155	default:
dd8e670d	156	dev_err(dev, "unknown mode is requested\n");
6a099c63 DK	157	err = -EINVAL;
	158	break;
	159	}
	160
6a099c63 DK	161	return err;
	162	}
	163
68b14134 MB	164	static const struct regmap_config usb3503_regmap_config = {
	165	.reg_bits = 8,
	166	.val_bits = 8,
	167
	168	.max_register = USB3503_RESET,
	169	};
	170
2487e3ee	171	static int usb3503_probe(struct usb3503 *hub)
6a099c63	172	{
2487e3ee MB	173	struct device *dev = hub->dev;
	174	struct usb3503_platform_data *pdata = dev_get_platdata(dev);
	175	struct device_node *np = dev->of_node;
	176	int err;
e5a0c874	177	u32 mode = USB3503_MODE_HUB;
e8b58b49 DK	178	const u32 *property;
e8b58b49 DK	179	int len;
6a099c63	180
eab8050c	181	if (pdata) {
e8e44a48	182	hub->port_off_mask = pdata->port_off_mask;
6a099c63 DK	183	hub->gpio_intn = pdata->gpio_intn;
	184	hub->gpio_connect = pdata->gpio_connect;
	185	hub->gpio_reset = pdata->gpio_reset;
	186	hub->mode = pdata->initial_mode;
eab8050c	187	} else if (np) {
657d898a	188	struct clk *clk;
e8b58b49 DK	189	hub->port_off_mask = 0;
e8b58b49 DK	190
657d898a MS	191	clk = devm_clk_get(dev, "refclk");
657d898a MS	192	if (IS_ERR(clk) && PTR_ERR(clk) != -ENOENT) {
ec5734c4 TB	193	dev_err(dev, "unable to request refclk (%ld)\n",
ec5734c4 TB	194	PTR_ERR(clk));
657d898a MS	195	return PTR_ERR(clk);
	196	}
	197
	198	if (!IS_ERR(clk)) {
	199	u32 rate = 0;
	200	hub->clk = clk;
	201
	202	if (!of_property_read_u32(np, "refclk-frequency",
	203	&rate)) {
	204
	205	switch (rate) {
	206	case 38400000:
	207	case 26000000:
	208	case 19200000:
	209	case 12000000:
	210	hub->secondary_ref_clk = 0;
	211	break;
	212	case 24000000:
	213	case 27000000:
	214	case 25000000:
	215	case 50000000:
	216	hub->secondary_ref_clk = 1;
	217	break;
	218	default:
	219	dev_err(dev,
	220	"unsupported reference clock rate (%d)\n",
	221	(int) rate);
	222	return -EINVAL;
	223	}
	224	err = clk_set_rate(hub->clk, rate);
	225	if (err) {
	226	dev_err(dev,
	227	"unable to set reference clock rate to %d\n",
	228	(int) rate);
	229	return err;
	230	}
	231	}
	232
	233	err = clk_prepare_enable(hub->clk);
	234	if (err) {
	235	dev_err(dev,
	236	"unable to enable reference clock\n");
	237	return err;
	238	}
	239	}
	240
e8b58b49 DK	241	property = of_get_property(np, "disabled-ports", &len);
	242	if (property && (len / sizeof(u32)) > 0) {
	243	int i;
	244	for (i = 0; i < len / sizeof(u32); i++) {
	245	u32 port = be32_to_cpu(property[i]);
	246	if ((1 <= port) && (port <= 3))
	247	hub->port_off_mask \|= (1 << port);
	248	}
	249	}
	250
42416cc8	251	hub->gpio_intn = of_get_named_gpio(np, "intn-gpios", 0);
eab8050c DK	252	if (hub->gpio_intn == -EPROBE_DEFER)
eab8050c DK	253	return -EPROBE_DEFER;
42416cc8	254	hub->gpio_connect = of_get_named_gpio(np, "connect-gpios", 0);
eab8050c DK	255	if (hub->gpio_connect == -EPROBE_DEFER)
eab8050c DK	256	return -EPROBE_DEFER;
ccf92c94	257	hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0);
eab8050c DK	258	if (hub->gpio_reset == -EPROBE_DEFER)
	259	return -EPROBE_DEFER;
	260	of_property_read_u32(np, "initial-mode", &mode);
	261	hub->mode = mode;
6a099c63 DK	262	}
6a099c63 DK	263
3f0d1c67 MB	264	if (hub->port_off_mask && !hub->regmap)
	265	dev_err(dev, "Ports disabled with no control interface\n");
	266
6a099c63	267	if (gpio_is_valid(hub->gpio_intn)) {
657d898a MS	268	int val = hub->secondary_ref_clk ? GPIOF_OUT_INIT_LOW :
	269	GPIOF_OUT_INIT_HIGH;
	270	err = devm_gpio_request_one(dev, hub->gpio_intn, val,
	271	"usb3503 intn");
6a099c63	272	if (err) {
2487e3ee MB	273	dev_err(dev,
	274	"unable to request GPIO %d as connect pin (%d)\n",
	275	hub->gpio_intn, err);
cffedd67	276	return err;
6a099c63 DK	277	}
	278	}
	279
	280	if (gpio_is_valid(hub->gpio_connect)) {
2487e3ee	281	err = devm_gpio_request_one(dev, hub->gpio_connect,
8e7245b8	282	GPIOF_OUT_INIT_LOW, "usb3503 connect");
6a099c63	283	if (err) {
2487e3ee MB	284	dev_err(dev,
	285	"unable to request GPIO %d as connect pin (%d)\n",
	286	hub->gpio_connect, err);
cffedd67	287	return err;
6a099c63 DK	288	}
	289	}
	290
	291	if (gpio_is_valid(hub->gpio_reset)) {
2487e3ee	292	err = devm_gpio_request_one(dev, hub->gpio_reset,
6a099c63 DK	293	GPIOF_OUT_INIT_LOW, "usb3503 reset");
6a099c63 DK	294	if (err) {
2487e3ee MB	295	dev_err(dev,
	296	"unable to request GPIO %d as reset pin (%d)\n",
	297	hub->gpio_reset, err);
cffedd67	298	return err;
6a099c63 DK	299	}
	300	}
	301
eab8050c	302	usb3503_switch_mode(hub, hub->mode);
6a099c63	303
dd8e670d	304	dev_info(dev, "%s: probed in %s mode\n", __func__,
6a099c63 DK	305	(hub->mode == USB3503_MODE_HUB) ? "hub" : "standby");
	306
	307	return 0;
6a099c63 DK	308	}
6a099c63 DK	309
2487e3ee MB	310	static int usb3503_i2c_probe(struct i2c_client *i2c,
	311	const struct i2c_device_id *id)
	312	{
	313	struct usb3503 *hub;
	314	int err;
	315
	316	hub = devm_kzalloc(&i2c->dev, sizeof(struct usb3503), GFP_KERNEL);
	317	if (!hub) {
	318	dev_err(&i2c->dev, "private data alloc fail\n");
	319	return -ENOMEM;
	320	}
	321
	322	i2c_set_clientdata(i2c, hub);
	323	hub->regmap = devm_regmap_init_i2c(i2c, &usb3503_regmap_config);
	324	if (IS_ERR(hub->regmap)) {
	325	err = PTR_ERR(hub->regmap);
	326	dev_err(&i2c->dev, "Failed to initialise regmap: %d\n", err);
	327	return err;
	328	}
	329	hub->dev = &i2c->dev;
	330
	331	return usb3503_probe(hub);
	332	}
	333
3f0d1c67 MB	334	static int usb3503_platform_probe(struct platform_device *pdev)
	335	{
	336	struct usb3503 *hub;
	337
	338	hub = devm_kzalloc(&pdev->dev, sizeof(struct usb3503), GFP_KERNEL);
	339	if (!hub) {
	340	dev_err(&pdev->dev, "private data alloc fail\n");
	341	return -ENOMEM;
	342	}
	343	hub->dev = &pdev->dev;
	344
	345	return usb3503_probe(hub);
	346	}
	347
ecdc071d JS	348	#ifdef CONFIG_PM_SLEEP
	349	static int usb3503_i2c_suspend(struct device *dev)
	350	{
	351	struct i2c_client *client = to_i2c_client(dev);
	352	struct usb3503 *hub = i2c_get_clientdata(client);
	353
	354	usb3503_switch_mode(hub, USB3503_MODE_STANDBY);
	355
	356	if (hub->clk)
	357	clk_disable_unprepare(hub->clk);
	358
	359	return 0;
	360	}
	361
	362	static int usb3503_i2c_resume(struct device *dev)
	363	{
	364	struct i2c_client *client = to_i2c_client(dev);
	365	struct usb3503 *hub = i2c_get_clientdata(client);
	366
	367	if (hub->clk)
	368	clk_prepare_enable(hub->clk);
	369
	370	usb3503_switch_mode(hub, hub->mode);
	371
	372	return 0;
	373	}
	374	#endif
	375
	376	static SIMPLE_DEV_PM_OPS(usb3503_i2c_pm_ops, usb3503_i2c_suspend,
	377	usb3503_i2c_resume);
	378
6a099c63 DK	379	static const struct i2c_device_id usb3503_id[] = {
	380	{ USB3503_I2C_NAME, 0 },
	381	{ }
	382	};
	383	MODULE_DEVICE_TABLE(i2c, usb3503_id);
	384
eab8050c DK	385	#ifdef CONFIG_OF
	386	static const struct of_device_id usb3503_of_match[] = {
	387	{ .compatible = "smsc,usb3503", },
5bdd1f4a	388	{ .compatible = "smsc,usb3503a", },
eab8050c DK	389	{},
	390	};
	391	MODULE_DEVICE_TABLE(of, usb3503_of_match);
	392	#endif
	393
3f0d1c67	394	static struct i2c_driver usb3503_i2c_driver = {
6a099c63 DK	395	.driver = {
6a099c63 DK	396	.name = USB3503_I2C_NAME,
ecdc071d	397	.pm = &usb3503_i2c_pm_ops,
eab8050c	398	.of_match_table = of_match_ptr(usb3503_of_match),
6a099c63	399	},
2487e3ee	400	.probe = usb3503_i2c_probe,
6a099c63 DK	401	.id_table = usb3503_id,
	402	};
	403
3f0d1c67 MB	404	static struct platform_driver usb3503_platform_driver = {
	405	.driver = {
	406	.name = USB3503_I2C_NAME,
	407	.of_match_table = of_match_ptr(usb3503_of_match),
	408	.owner = THIS_MODULE,
	409	},
	410	.probe = usb3503_platform_probe,
	411	};
	412
	413	static int __init usb3503_init(void)
	414	{
	415	int err;
	416
	417	err = i2c_register_driver(THIS_MODULE, &usb3503_i2c_driver);
	418	if (err != 0)
	419	pr_err("usb3503: Failed to register I2C driver: %d\n", err);
	420
	421	err = platform_driver_register(&usb3503_platform_driver);
	422	if (err != 0)
	423	pr_err("usb3503: Failed to register platform driver: %d\n",
	424	err);
	425
	426	return 0;
	427	}
	428	module_init(usb3503_init);
	429
	430	static void __exit usb3503_exit(void)
	431	{
	432	platform_driver_unregister(&usb3503_platform_driver);
	433	i2c_del_driver(&usb3503_i2c_driver);
	434	}
	435	module_exit(usb3503_exit);
6a099c63 DK	436
	437	MODULE_AUTHOR("Dongjin Kim <tobetter@gmail.com>");
	438	MODULE_DESCRIPTION("USB3503 USB HUB driver");
	439	MODULE_LICENSE("GPL");