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

// SPDX-License-Identifier: GPL-2.0+
/*
 * 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 : Set the ports which are disabled in self-powered mode. */
		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 : Set SELF_BUS_PWR, this enables self-powered 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;
		u32 rate = 0;
		hub->port_off_mask = 0;

		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;
			}
		}

		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)) {
			hub->clk = clk;

			if (rate != 0) {
				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 interrupt 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)
		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_i2c_remove(struct i2c_client *i2c)
{
	struct usb3503 *hub;

	hub = i2c_get_clientdata(i2c);
	if (hub->clk)
		clk_disable_unprepare(hub->clk);

	return 0;
}

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

	hub = devm_kzalloc(&pdev->dev, sizeof(struct usb3503), GFP_KERNEL);
	if (!hub)
		return -ENOMEM;
	hub->dev = &pdev->dev;
	platform_set_drvdata(pdev, hub);

	return usb3503_probe(hub);
}

static int usb3503_platform_remove(struct platform_device *pdev)
{
	struct usb3503 *hub;

	hub = platform_get_drvdata(pdev);
	if (hub->clk)
		clk_disable_unprepare(hub->clk);

	return 0;
}

#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,
	.remove		= usb3503_i2c_remove,
	.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),
	},
	.probe		= usb3503_platform_probe,
	.remove		= usb3503_platform_remove,
};

static int __init usb3503_init(void)
{
	int err;

	err = i2c_add_driver(&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
5fd54ace	1	// SPDX-License-Identifier: GPL-2.0+
6a099c63 DK	2	/*
	3	* Driver for SMSC USB3503 USB 2.0 hub controller driver
	4	*
	5	* Copyright (c) 2012-2013 Dongjin Kim (tobetter@gmail.com)
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
	21
657d898a	22	#include <linux/clk.h>
6a099c63 DK	23	#include <linux/i2c.h>
	24	#include <linux/gpio.h>
	25	#include <linux/delay.h>
	26	#include <linux/slab.h>
	27	#include <linux/module.h>
eab8050c	28	#include <linux/of_gpio.h>
6a099c63 DK	29	#include <linux/platform_device.h>
6a099c63 DK	30	#include <linux/platform_data/usb3503.h>
68b14134	31	#include <linux/regmap.h>
6a099c63 DK	32
	33	#define USB3503_VIDL 0x00
	34	#define USB3503_VIDM 0x01
	35	#define USB3503_PIDL 0x02
	36	#define USB3503_PIDM 0x03
	37	#define USB3503_DIDL 0x04
	38	#define USB3503_DIDM 0x05
	39
	40	#define USB3503_CFG1 0x06
	41	#define USB3503_SELF_BUS_PWR (1 << 7)
	42
	43	#define USB3503_CFG2 0x07
	44	#define USB3503_CFG3 0x08
	45	#define USB3503_NRD 0x09
	46
	47	#define USB3503_PDS 0x0a
6a099c63 DK	48
	49	#define USB3503_SP_ILOCK 0xe7
	50	#define USB3503_SPILOCK_CONNECT (1 << 1)
	51	#define USB3503_SPILOCK_CONFIG (1 << 0)
	52
	53	#define USB3503_CFGP 0xee
	54	#define USB3503_CLKSUSP (1 << 7)
	55
68b14134 MB	56	#define USB3503_RESET 0xff
68b14134 MB	57
6a099c63 DK	58	struct usb3503 {
6a099c63 DK	59	enum usb3503_mode mode;
68b14134 MB	60	struct regmap *regmap;
68b14134 MB	61	struct device *dev;
657d898a	62	struct clk *clk;
e8e44a48	63	u8 port_off_mask;
6a099c63 DK	64	int gpio_intn;
	65	int gpio_reset;
	66	int gpio_connect;
657d898a	67	bool secondary_ref_clk;
6a099c63 DK	68	};
6a099c63 DK	69
8e7245b8	70	static int usb3503_reset(struct usb3503 *hub, int state)
6a099c63	71	{
8e7245b8 MB	72	if (!state && gpio_is_valid(hub->gpio_connect))
	73	gpio_set_value_cansleep(hub->gpio_connect, 0);
	74
	75	if (gpio_is_valid(hub->gpio_reset))
	76	gpio_set_value_cansleep(hub->gpio_reset, state);
6a099c63	77
06a962fa	78	/* Wait T_HUBINIT == 4ms for hub logic to stabilize */
6a099c63	79	if (state)
06a962fa	80	usleep_range(4000, 10000);
6a099c63 DK	81
	82	return 0;
	83	}
	84
3f0d1c67	85	static int usb3503_connect(struct usb3503 *hub)
6a099c63	86	{
68b14134	87	struct device *dev = hub->dev;
3f0d1c67	88	int err;
6a099c63	89
3f0d1c67	90	usb3503_reset(hub, 1);
6a099c63	91
3f0d1c67	92	if (hub->regmap) {
6a099c63	93	/* SP_ILOCK: set connect_n, config_n for config */
68b14134	94	err = regmap_write(hub->regmap, USB3503_SP_ILOCK,
3f0d1c67	95	(USB3503_SPILOCK_CONNECT
6a099c63 DK	96	\| USB3503_SPILOCK_CONFIG));
6a099c63 DK	97	if (err < 0) {
68b14134	98	dev_err(dev, "SP_ILOCK failed (%d)\n", err);
3f0d1c67	99	return err;
6a099c63 DK	100	}
6a099c63 DK	101
4463e152	102	/* PDS : Set the ports which are disabled in self-powered mode. */
e8e44a48	103	if (hub->port_off_mask) {
68b14134 MB	104	err = regmap_update_bits(hub->regmap, USB3503_PDS,
68b14134 MB	105	hub->port_off_mask,
e8e44a48 DK	106	hub->port_off_mask);
e8e44a48 DK	107	if (err < 0) {
68b14134	108	dev_err(dev, "PDS failed (%d)\n", err);
3f0d1c67	109	return err;
e8e44a48	110	}
6a099c63 DK	111	}
6a099c63 DK	112
4463e152	113	/* CFG1 : Set SELF_BUS_PWR, this enables self-powered operation. */
68b14134 MB	114	err = regmap_update_bits(hub->regmap, USB3503_CFG1,
	115	USB3503_SELF_BUS_PWR,
	116	USB3503_SELF_BUS_PWR);
6a099c63	117	if (err < 0) {
68b14134	118	dev_err(dev, "CFG1 failed (%d)\n", err);
3f0d1c67	119	return err;
6a099c63 DK	120	}
	121
	122	/* SP_LOCK: clear connect_n, config_n for hub connect */
68b14134 MB	123	err = regmap_update_bits(hub->regmap, USB3503_SP_ILOCK,
	124	(USB3503_SPILOCK_CONNECT
	125	\| USB3503_SPILOCK_CONFIG), 0);
6a099c63	126	if (err < 0) {
68b14134	127	dev_err(dev, "SP_ILOCK failed (%d)\n", err);
3f0d1c67	128	return err;
6a099c63	129	}
3f0d1c67	130	}
6a099c63	131
3f0d1c67 MB	132	if (gpio_is_valid(hub->gpio_connect))
3f0d1c67 MB	133	gpio_set_value_cansleep(hub->gpio_connect, 1);
8e7245b8	134
3f0d1c67 MB	135	hub->mode = USB3503_MODE_HUB;
	136	dev_info(dev, "switched to HUB mode\n");
	137
	138	return 0;
	139	}
	140
	141	static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode)
	142	{
	143	struct device *dev = hub->dev;
	144	int err = 0;
	145
	146	switch (mode) {
	147	case USB3503_MODE_HUB:
	148	err = usb3503_connect(hub);
6a099c63 DK	149	break;
	150
	151	case USB3503_MODE_STANDBY:
8e7245b8	152	usb3503_reset(hub, 0);
68b14134	153	dev_info(dev, "switched to STANDBY mode\n");
6a099c63 DK	154	break;
	155
	156	default:
dd8e670d	157	dev_err(dev, "unknown mode is requested\n");
6a099c63 DK	158	err = -EINVAL;
	159	break;
	160	}
	161
6a099c63 DK	162	return err;
	163	}
	164
68b14134 MB	165	static const struct regmap_config usb3503_regmap_config = {
	166	.reg_bits = 8,
	167	.val_bits = 8,
	168
	169	.max_register = USB3503_RESET,
	170	};
	171
2487e3ee	172	static int usb3503_probe(struct usb3503 *hub)
6a099c63	173	{
2487e3ee MB	174	struct device *dev = hub->dev;
	175	struct usb3503_platform_data *pdata = dev_get_platdata(dev);
	176	struct device_node *np = dev->of_node;
	177	int err;
e5a0c874	178	u32 mode = USB3503_MODE_HUB;
e8b58b49 DK	179	const u32 *property;
e8b58b49 DK	180	int len;
6a099c63	181
eab8050c	182	if (pdata) {
e8e44a48	183	hub->port_off_mask = pdata->port_off_mask;
6a099c63 DK	184	hub->gpio_intn = pdata->gpio_intn;
	185	hub->gpio_connect = pdata->gpio_connect;
	186	hub->gpio_reset = pdata->gpio_reset;
	187	hub->mode = pdata->initial_mode;
eab8050c	188	} else if (np) {
657d898a	189	struct clk *clk;
c0ab6bb0	190	u32 rate = 0;
e8b58b49 DK	191	hub->port_off_mask = 0;
e8b58b49 DK	192
c0ab6bb0 BG	193	if (!of_property_read_u32(np, "refclk-frequency", &rate)) {
	194	switch (rate) {
	195	case 38400000:
	196	case 26000000:
	197	case 19200000:
	198	case 12000000:
	199	hub->secondary_ref_clk = 0;
	200	break;
	201	case 24000000:
	202	case 27000000:
	203	case 25000000:
	204	case 50000000:
	205	hub->secondary_ref_clk = 1;
	206	break;
	207	default:
	208	dev_err(dev,
	209	"unsupported reference clock rate (%d)\n",
	210	(int) rate);
	211	return -EINVAL;
	212	}
	213	}
	214
657d898a MS	215	clk = devm_clk_get(dev, "refclk");
657d898a MS	216	if (IS_ERR(clk) && PTR_ERR(clk) != -ENOENT) {
ec5734c4 TB	217	dev_err(dev, "unable to request refclk (%ld)\n",
ec5734c4 TB	218	PTR_ERR(clk));
657d898a MS	219	return PTR_ERR(clk);
	220	}
	221
	222	if (!IS_ERR(clk)) {
657d898a MS	223	hub->clk = clk;
657d898a MS	224
c0ab6bb0	225	if (rate != 0) {
657d898a MS	226	err = clk_set_rate(hub->clk, rate);
	227	if (err) {
	228	dev_err(dev,
	229	"unable to set reference clock rate to %d\n",
	230	(int) rate);
	231	return err;
	232	}
	233	}
	234
	235	err = clk_prepare_enable(hub->clk);
	236	if (err) {
	237	dev_err(dev,
	238	"unable to enable reference clock\n");
	239	return err;
	240	}
	241	}
	242
e8b58b49 DK	243	property = of_get_property(np, "disabled-ports", &len);
	244	if (property && (len / sizeof(u32)) > 0) {
	245	int i;
	246	for (i = 0; i < len / sizeof(u32); i++) {
	247	u32 port = be32_to_cpu(property[i]);
	248	if ((1 <= port) && (port <= 3))
	249	hub->port_off_mask \|= (1 << port);
	250	}
	251	}
	252
42416cc8	253	hub->gpio_intn = of_get_named_gpio(np, "intn-gpios", 0);
eab8050c DK	254	if (hub->gpio_intn == -EPROBE_DEFER)
eab8050c DK	255	return -EPROBE_DEFER;
42416cc8	256	hub->gpio_connect = of_get_named_gpio(np, "connect-gpios", 0);
eab8050c DK	257	if (hub->gpio_connect == -EPROBE_DEFER)
eab8050c DK	258	return -EPROBE_DEFER;
ccf92c94	259	hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0);
eab8050c DK	260	if (hub->gpio_reset == -EPROBE_DEFER)
	261	return -EPROBE_DEFER;
	262	of_property_read_u32(np, "initial-mode", &mode);
	263	hub->mode = mode;
6a099c63 DK	264	}
6a099c63 DK	265
3f0d1c67 MB	266	if (hub->port_off_mask && !hub->regmap)
	267	dev_err(dev, "Ports disabled with no control interface\n");
	268
6a099c63	269	if (gpio_is_valid(hub->gpio_intn)) {
657d898a MS	270	int val = hub->secondary_ref_clk ? GPIOF_OUT_INIT_LOW :
	271	GPIOF_OUT_INIT_HIGH;
	272	err = devm_gpio_request_one(dev, hub->gpio_intn, val,
	273	"usb3503 intn");
6a099c63	274	if (err) {
2487e3ee	275	dev_err(dev,
6b084421	276	"unable to request GPIO %d as interrupt pin (%d)\n",
2487e3ee	277	hub->gpio_intn, err);
cffedd67	278	return err;
6a099c63 DK	279	}
	280	}
	281
	282	if (gpio_is_valid(hub->gpio_connect)) {
2487e3ee	283	err = devm_gpio_request_one(dev, hub->gpio_connect,
8e7245b8	284	GPIOF_OUT_INIT_LOW, "usb3503 connect");
6a099c63	285	if (err) {
2487e3ee MB	286	dev_err(dev,
	287	"unable to request GPIO %d as connect pin (%d)\n",
	288	hub->gpio_connect, err);
cffedd67	289	return err;
6a099c63 DK	290	}
	291	}
	292
	293	if (gpio_is_valid(hub->gpio_reset)) {
2487e3ee	294	err = devm_gpio_request_one(dev, hub->gpio_reset,
6a099c63 DK	295	GPIOF_OUT_INIT_LOW, "usb3503 reset");
6a099c63 DK	296	if (err) {
2487e3ee MB	297	dev_err(dev,
	298	"unable to request GPIO %d as reset pin (%d)\n",
	299	hub->gpio_reset, err);
cffedd67	300	return err;
6a099c63 DK	301	}
	302	}
	303
eab8050c	304	usb3503_switch_mode(hub, hub->mode);
6a099c63	305
dd8e670d	306	dev_info(dev, "%s: probed in %s mode\n", __func__,
6a099c63 DK	307	(hub->mode == USB3503_MODE_HUB) ? "hub" : "standby");
	308
	309	return 0;
6a099c63 DK	310	}
6a099c63 DK	311
2487e3ee MB	312	static int usb3503_i2c_probe(struct i2c_client *i2c,
	313	const struct i2c_device_id *id)
	314	{
	315	struct usb3503 *hub;
	316	int err;
	317
	318	hub = devm_kzalloc(&i2c->dev, sizeof(struct usb3503), GFP_KERNEL);
39d98bdc	319	if (!hub)
2487e3ee	320	return -ENOMEM;
2487e3ee MB	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
62c32e46 KK	334	static int usb3503_i2c_remove(struct i2c_client *i2c)
	335	{
	336	struct usb3503 *hub;
	337
	338	hub = i2c_get_clientdata(i2c);
	339	if (hub->clk)
	340	clk_disable_unprepare(hub->clk);
	341
	342	return 0;
	343	}
	344
3f0d1c67 MB	345	static int usb3503_platform_probe(struct platform_device *pdev)
	346	{
	347	struct usb3503 *hub;
	348
	349	hub = devm_kzalloc(&pdev->dev, sizeof(struct usb3503), GFP_KERNEL);
39d98bdc	350	if (!hub)
3f0d1c67	351	return -ENOMEM;
3f0d1c67	352	hub->dev = &pdev->dev;
495660cb	353	platform_set_drvdata(pdev, hub);
3f0d1c67 MB	354
	355	return usb3503_probe(hub);
	356	}
	357
62c32e46 KK	358	static int usb3503_platform_remove(struct platform_device *pdev)
	359	{
	360	struct usb3503 *hub;
	361
	362	hub = platform_get_drvdata(pdev);
	363	if (hub->clk)
	364	clk_disable_unprepare(hub->clk);
	365
	366	return 0;
	367	}
	368
ecdc071d JS	369	#ifdef CONFIG_PM_SLEEP
	370	static int usb3503_i2c_suspend(struct device *dev)
	371	{
	372	struct i2c_client *client = to_i2c_client(dev);
	373	struct usb3503 *hub = i2c_get_clientdata(client);
	374
	375	usb3503_switch_mode(hub, USB3503_MODE_STANDBY);
	376
	377	if (hub->clk)
	378	clk_disable_unprepare(hub->clk);
	379
	380	return 0;
	381	}
	382
	383	static int usb3503_i2c_resume(struct device *dev)
	384	{
	385	struct i2c_client *client = to_i2c_client(dev);
	386	struct usb3503 *hub = i2c_get_clientdata(client);
	387
	388	if (hub->clk)
	389	clk_prepare_enable(hub->clk);
	390
	391	usb3503_switch_mode(hub, hub->mode);
	392
	393	return 0;
	394	}
	395	#endif
	396
	397	static SIMPLE_DEV_PM_OPS(usb3503_i2c_pm_ops, usb3503_i2c_suspend,
	398	usb3503_i2c_resume);
	399
6a099c63 DK	400	static const struct i2c_device_id usb3503_id[] = {
	401	{ USB3503_I2C_NAME, 0 },
	402	{ }
	403	};
	404	MODULE_DEVICE_TABLE(i2c, usb3503_id);
	405
eab8050c DK	406	#ifdef CONFIG_OF
	407	static const struct of_device_id usb3503_of_match[] = {
	408	{ .compatible = "smsc,usb3503", },
5bdd1f4a	409	{ .compatible = "smsc,usb3503a", },
eab8050c DK	410	{},
	411	};
	412	MODULE_DEVICE_TABLE(of, usb3503_of_match);
	413	#endif
	414
3f0d1c67	415	static struct i2c_driver usb3503_i2c_driver = {
6a099c63 DK	416	.driver = {
6a099c63 DK	417	.name = USB3503_I2C_NAME,
ecdc071d	418	.pm = &usb3503_i2c_pm_ops,
eab8050c	419	.of_match_table = of_match_ptr(usb3503_of_match),
6a099c63	420	},
2487e3ee	421	.probe = usb3503_i2c_probe,
62c32e46	422	.remove = usb3503_i2c_remove,
6a099c63 DK	423	.id_table = usb3503_id,
	424	};
	425
3f0d1c67 MB	426	static struct platform_driver usb3503_platform_driver = {
	427	.driver = {
	428	.name = USB3503_I2C_NAME,
	429	.of_match_table = of_match_ptr(usb3503_of_match),
3f0d1c67 MB	430	},
3f0d1c67 MB	431	.probe = usb3503_platform_probe,
62c32e46	432	.remove = usb3503_platform_remove,
3f0d1c67 MB	433	};
	434
	435	static int __init usb3503_init(void)
	436	{
	437	int err;
	438
aa5b477d	439	err = i2c_add_driver(&usb3503_i2c_driver);
3f0d1c67 MB	440	if (err != 0)
	441	pr_err("usb3503: Failed to register I2C driver: %d\n", err);
	442
	443	err = platform_driver_register(&usb3503_platform_driver);
	444	if (err != 0)
	445	pr_err("usb3503: Failed to register platform driver: %d\n",
	446	err);
	447
	448	return 0;
	449	}
	450	module_init(usb3503_init);
	451
	452	static void __exit usb3503_exit(void)
	453	{
	454	platform_driver_unregister(&usb3503_platform_driver);
	455	i2c_del_driver(&usb3503_i2c_driver);
	456	}
	457	module_exit(usb3503_exit);
6a099c63 DK	458
	459	MODULE_AUTHOR("Dongjin Kim <tobetter@gmail.com>");
	460	MODULE_DESCRIPTION("USB3503 USB HUB driver");
	461	MODULE_LICENSE("GPL");