[mirror_ubuntu-bionic-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)
 */

#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");
		/* Datasheet defines a hardware reset to be at least 100us */
		usleep_range(100, 10000);
		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)
6a099c63 DK	6	*/
6a099c63 DK	7
657d898a	8	#include <linux/clk.h>
6a099c63 DK	9	#include <linux/i2c.h>
	10	#include <linux/gpio.h>
	11	#include <linux/delay.h>
	12	#include <linux/slab.h>
	13	#include <linux/module.h>
eab8050c	14	#include <linux/of_gpio.h>
6a099c63 DK	15	#include <linux/platform_device.h>
6a099c63 DK	16	#include <linux/platform_data/usb3503.h>
68b14134	17	#include <linux/regmap.h>
6a099c63 DK	18
	19	#define USB3503_VIDL 0x00
	20	#define USB3503_VIDM 0x01
	21	#define USB3503_PIDL 0x02
	22	#define USB3503_PIDM 0x03
	23	#define USB3503_DIDL 0x04
	24	#define USB3503_DIDM 0x05
	25
	26	#define USB3503_CFG1 0x06
	27	#define USB3503_SELF_BUS_PWR (1 << 7)
	28
	29	#define USB3503_CFG2 0x07
	30	#define USB3503_CFG3 0x08
	31	#define USB3503_NRD 0x09
	32
	33	#define USB3503_PDS 0x0a
6a099c63 DK	34
	35	#define USB3503_SP_ILOCK 0xe7
	36	#define USB3503_SPILOCK_CONNECT (1 << 1)
	37	#define USB3503_SPILOCK_CONFIG (1 << 0)
	38
	39	#define USB3503_CFGP 0xee
	40	#define USB3503_CLKSUSP (1 << 7)
	41
68b14134 MB	42	#define USB3503_RESET 0xff
68b14134 MB	43
6a099c63 DK	44	struct usb3503 {
6a099c63 DK	45	enum usb3503_mode mode;
68b14134 MB	46	struct regmap *regmap;
68b14134 MB	47	struct device *dev;
657d898a	48	struct clk *clk;
e8e44a48	49	u8 port_off_mask;
6a099c63 DK	50	int gpio_intn;
	51	int gpio_reset;
	52	int gpio_connect;
657d898a	53	bool secondary_ref_clk;
6a099c63 DK	54	};
6a099c63 DK	55
8e7245b8	56	static int usb3503_reset(struct usb3503 *hub, int state)
6a099c63	57	{
8e7245b8 MB	58	if (!state && gpio_is_valid(hub->gpio_connect))
	59	gpio_set_value_cansleep(hub->gpio_connect, 0);
	60
	61	if (gpio_is_valid(hub->gpio_reset))
	62	gpio_set_value_cansleep(hub->gpio_reset, state);
6a099c63	63
06a962fa	64	/* Wait T_HUBINIT == 4ms for hub logic to stabilize */
6a099c63	65	if (state)
06a962fa	66	usleep_range(4000, 10000);
6a099c63 DK	67
	68	return 0;
	69	}
	70
3f0d1c67	71	static int usb3503_connect(struct usb3503 *hub)
6a099c63	72	{
68b14134	73	struct device *dev = hub->dev;
3f0d1c67	74	int err;
6a099c63	75
3f0d1c67	76	usb3503_reset(hub, 1);
6a099c63	77
3f0d1c67	78	if (hub->regmap) {
6a099c63	79	/* SP_ILOCK: set connect_n, config_n for config */
68b14134	80	err = regmap_write(hub->regmap, USB3503_SP_ILOCK,
3f0d1c67	81	(USB3503_SPILOCK_CONNECT
6a099c63 DK	82	\| USB3503_SPILOCK_CONFIG));
6a099c63 DK	83	if (err < 0) {
68b14134	84	dev_err(dev, "SP_ILOCK failed (%d)\n", err);
3f0d1c67	85	return err;
6a099c63 DK	86	}
6a099c63 DK	87
4463e152	88	/* PDS : Set the ports which are disabled in self-powered mode. */
e8e44a48	89	if (hub->port_off_mask) {
68b14134 MB	90	err = regmap_update_bits(hub->regmap, USB3503_PDS,
68b14134 MB	91	hub->port_off_mask,
e8e44a48 DK	92	hub->port_off_mask);
e8e44a48 DK	93	if (err < 0) {
68b14134	94	dev_err(dev, "PDS failed (%d)\n", err);
3f0d1c67	95	return err;
e8e44a48	96	}
6a099c63 DK	97	}
6a099c63 DK	98
4463e152	99	/* CFG1 : Set SELF_BUS_PWR, this enables self-powered operation. */
68b14134 MB	100	err = regmap_update_bits(hub->regmap, USB3503_CFG1,
	101	USB3503_SELF_BUS_PWR,
	102	USB3503_SELF_BUS_PWR);
6a099c63	103	if (err < 0) {
68b14134	104	dev_err(dev, "CFG1 failed (%d)\n", err);
3f0d1c67	105	return err;
6a099c63 DK	106	}
	107
	108	/* SP_LOCK: clear connect_n, config_n for hub connect */
68b14134 MB	109	err = regmap_update_bits(hub->regmap, USB3503_SP_ILOCK,
	110	(USB3503_SPILOCK_CONNECT
	111	\| USB3503_SPILOCK_CONFIG), 0);
6a099c63	112	if (err < 0) {
68b14134	113	dev_err(dev, "SP_ILOCK failed (%d)\n", err);
3f0d1c67	114	return err;
6a099c63	115	}
3f0d1c67	116	}
6a099c63	117
3f0d1c67 MB	118	if (gpio_is_valid(hub->gpio_connect))
3f0d1c67 MB	119	gpio_set_value_cansleep(hub->gpio_connect, 1);
8e7245b8	120
3f0d1c67 MB	121	hub->mode = USB3503_MODE_HUB;
	122	dev_info(dev, "switched to HUB mode\n");
	123
	124	return 0;
	125	}
	126
	127	static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode)
	128	{
	129	struct device *dev = hub->dev;
	130	int err = 0;
	131
	132	switch (mode) {
	133	case USB3503_MODE_HUB:
	134	err = usb3503_connect(hub);
6a099c63 DK	135	break;
	136
	137	case USB3503_MODE_STANDBY:
8e7245b8	138	usb3503_reset(hub, 0);
68b14134	139	dev_info(dev, "switched to STANDBY mode\n");
6a099c63 DK	140	break;
	141
	142	default:
dd8e670d	143	dev_err(dev, "unknown mode is requested\n");
6a099c63 DK	144	err = -EINVAL;
	145	break;
	146	}
	147
6a099c63 DK	148	return err;
	149	}
	150
68b14134 MB	151	static const struct regmap_config usb3503_regmap_config = {
	152	.reg_bits = 8,
	153	.val_bits = 8,
	154
	155	.max_register = USB3503_RESET,
	156	};
	157
2487e3ee	158	static int usb3503_probe(struct usb3503 *hub)
6a099c63	159	{
2487e3ee MB	160	struct device *dev = hub->dev;
	161	struct usb3503_platform_data *pdata = dev_get_platdata(dev);
	162	struct device_node *np = dev->of_node;
	163	int err;
e5a0c874	164	u32 mode = USB3503_MODE_HUB;
e8b58b49 DK	165	const u32 *property;
e8b58b49 DK	166	int len;
6a099c63	167
eab8050c	168	if (pdata) {
e8e44a48	169	hub->port_off_mask = pdata->port_off_mask;
6a099c63 DK	170	hub->gpio_intn = pdata->gpio_intn;
	171	hub->gpio_connect = pdata->gpio_connect;
	172	hub->gpio_reset = pdata->gpio_reset;
	173	hub->mode = pdata->initial_mode;
eab8050c	174	} else if (np) {
657d898a	175	struct clk *clk;
c0ab6bb0	176	u32 rate = 0;
e8b58b49 DK	177	hub->port_off_mask = 0;
e8b58b49 DK	178
c0ab6bb0 BG	179	if (!of_property_read_u32(np, "refclk-frequency", &rate)) {
	180	switch (rate) {
	181	case 38400000:
	182	case 26000000:
	183	case 19200000:
	184	case 12000000:
	185	hub->secondary_ref_clk = 0;
	186	break;
	187	case 24000000:
	188	case 27000000:
	189	case 25000000:
	190	case 50000000:
	191	hub->secondary_ref_clk = 1;
	192	break;
	193	default:
	194	dev_err(dev,
	195	"unsupported reference clock rate (%d)\n",
	196	(int) rate);
	197	return -EINVAL;
	198	}
	199	}
	200
657d898a MS	201	clk = devm_clk_get(dev, "refclk");
657d898a MS	202	if (IS_ERR(clk) && PTR_ERR(clk) != -ENOENT) {
ec5734c4 TB	203	dev_err(dev, "unable to request refclk (%ld)\n",
ec5734c4 TB	204	PTR_ERR(clk));
657d898a MS	205	return PTR_ERR(clk);
	206	}
	207
	208	if (!IS_ERR(clk)) {
657d898a MS	209	hub->clk = clk;
657d898a MS	210
c0ab6bb0	211	if (rate != 0) {
657d898a MS	212	err = clk_set_rate(hub->clk, rate);
	213	if (err) {
	214	dev_err(dev,
	215	"unable to set reference clock rate to %d\n",
	216	(int) rate);
	217	return err;
	218	}
	219	}
	220
	221	err = clk_prepare_enable(hub->clk);
	222	if (err) {
	223	dev_err(dev,
	224	"unable to enable reference clock\n");
	225	return err;
	226	}
	227	}
	228
e8b58b49 DK	229	property = of_get_property(np, "disabled-ports", &len);
	230	if (property && (len / sizeof(u32)) > 0) {
	231	int i;
	232	for (i = 0; i < len / sizeof(u32); i++) {
	233	u32 port = be32_to_cpu(property[i]);
	234	if ((1 <= port) && (port <= 3))
	235	hub->port_off_mask \|= (1 << port);
	236	}
	237	}
	238
42416cc8	239	hub->gpio_intn = of_get_named_gpio(np, "intn-gpios", 0);
eab8050c DK	240	if (hub->gpio_intn == -EPROBE_DEFER)
eab8050c DK	241	return -EPROBE_DEFER;
42416cc8	242	hub->gpio_connect = of_get_named_gpio(np, "connect-gpios", 0);
eab8050c DK	243	if (hub->gpio_connect == -EPROBE_DEFER)
eab8050c DK	244	return -EPROBE_DEFER;
ccf92c94	245	hub->gpio_reset = of_get_named_gpio(np, "reset-gpios", 0);
eab8050c DK	246	if (hub->gpio_reset == -EPROBE_DEFER)
	247	return -EPROBE_DEFER;
	248	of_property_read_u32(np, "initial-mode", &mode);
	249	hub->mode = mode;
6a099c63 DK	250	}
6a099c63 DK	251
3f0d1c67 MB	252	if (hub->port_off_mask && !hub->regmap)
	253	dev_err(dev, "Ports disabled with no control interface\n");
	254
6a099c63	255	if (gpio_is_valid(hub->gpio_intn)) {
657d898a MS	256	int val = hub->secondary_ref_clk ? GPIOF_OUT_INIT_LOW :
	257	GPIOF_OUT_INIT_HIGH;
	258	err = devm_gpio_request_one(dev, hub->gpio_intn, val,
	259	"usb3503 intn");
6a099c63	260	if (err) {
2487e3ee	261	dev_err(dev,
6b084421	262	"unable to request GPIO %d as interrupt pin (%d)\n",
2487e3ee	263	hub->gpio_intn, err);
cffedd67	264	return err;
6a099c63 DK	265	}
	266	}
	267
	268	if (gpio_is_valid(hub->gpio_connect)) {
2487e3ee	269	err = devm_gpio_request_one(dev, hub->gpio_connect,
8e7245b8	270	GPIOF_OUT_INIT_LOW, "usb3503 connect");
6a099c63	271	if (err) {
2487e3ee MB	272	dev_err(dev,
	273	"unable to request GPIO %d as connect pin (%d)\n",
	274	hub->gpio_connect, err);
cffedd67	275	return err;
6a099c63 DK	276	}
	277	}
	278
	279	if (gpio_is_valid(hub->gpio_reset)) {
2487e3ee	280	err = devm_gpio_request_one(dev, hub->gpio_reset,
6a099c63	281	GPIOF_OUT_INIT_LOW, "usb3503 reset");
b8626f1d SA	282	/* Datasheet defines a hardware reset to be at least 100us */
b8626f1d SA	283	usleep_range(100, 10000);
6a099c63	284	if (err) {
2487e3ee MB	285	dev_err(dev,
	286	"unable to request GPIO %d as reset pin (%d)\n",
	287	hub->gpio_reset, err);
cffedd67	288	return err;
6a099c63 DK	289	}
	290	}
	291
eab8050c	292	usb3503_switch_mode(hub, hub->mode);
6a099c63	293
dd8e670d	294	dev_info(dev, "%s: probed in %s mode\n", __func__,
6a099c63 DK	295	(hub->mode == USB3503_MODE_HUB) ? "hub" : "standby");
	296
	297	return 0;
6a099c63 DK	298	}
6a099c63 DK	299
2487e3ee MB	300	static int usb3503_i2c_probe(struct i2c_client *i2c,
	301	const struct i2c_device_id *id)
	302	{
	303	struct usb3503 *hub;
	304	int err;
	305
	306	hub = devm_kzalloc(&i2c->dev, sizeof(struct usb3503), GFP_KERNEL);
39d98bdc	307	if (!hub)
2487e3ee	308	return -ENOMEM;
2487e3ee MB	309
	310	i2c_set_clientdata(i2c, hub);
	311	hub->regmap = devm_regmap_init_i2c(i2c, &usb3503_regmap_config);
	312	if (IS_ERR(hub->regmap)) {
	313	err = PTR_ERR(hub->regmap);
	314	dev_err(&i2c->dev, "Failed to initialise regmap: %d\n", err);
	315	return err;
	316	}
	317	hub->dev = &i2c->dev;
	318
	319	return usb3503_probe(hub);
	320	}
	321
62c32e46 KK	322	static int usb3503_i2c_remove(struct i2c_client *i2c)
	323	{
	324	struct usb3503 *hub;
	325
	326	hub = i2c_get_clientdata(i2c);
	327	if (hub->clk)
	328	clk_disable_unprepare(hub->clk);
	329
	330	return 0;
	331	}
	332
3f0d1c67 MB	333	static int usb3503_platform_probe(struct platform_device *pdev)
	334	{
	335	struct usb3503 *hub;
	336
	337	hub = devm_kzalloc(&pdev->dev, sizeof(struct usb3503), GFP_KERNEL);
39d98bdc	338	if (!hub)
3f0d1c67	339	return -ENOMEM;
3f0d1c67	340	hub->dev = &pdev->dev;
495660cb	341	platform_set_drvdata(pdev, hub);
3f0d1c67 MB	342
	343	return usb3503_probe(hub);
	344	}
	345
62c32e46 KK	346	static int usb3503_platform_remove(struct platform_device *pdev)
	347	{
	348	struct usb3503 *hub;
	349
	350	hub = platform_get_drvdata(pdev);
	351	if (hub->clk)
	352	clk_disable_unprepare(hub->clk);
	353
	354	return 0;
	355	}
	356
ecdc071d JS	357	#ifdef CONFIG_PM_SLEEP
	358	static int usb3503_i2c_suspend(struct device *dev)
	359	{
	360	struct i2c_client *client = to_i2c_client(dev);
	361	struct usb3503 *hub = i2c_get_clientdata(client);
	362
	363	usb3503_switch_mode(hub, USB3503_MODE_STANDBY);
	364
	365	if (hub->clk)
	366	clk_disable_unprepare(hub->clk);
	367
	368	return 0;
	369	}
	370
	371	static int usb3503_i2c_resume(struct device *dev)
	372	{
	373	struct i2c_client *client = to_i2c_client(dev);
	374	struct usb3503 *hub = i2c_get_clientdata(client);
	375
	376	if (hub->clk)
	377	clk_prepare_enable(hub->clk);
	378
	379	usb3503_switch_mode(hub, hub->mode);
	380
	381	return 0;
	382	}
	383	#endif
	384
	385	static SIMPLE_DEV_PM_OPS(usb3503_i2c_pm_ops, usb3503_i2c_suspend,
	386	usb3503_i2c_resume);
	387
6a099c63 DK	388	static const struct i2c_device_id usb3503_id[] = {
	389	{ USB3503_I2C_NAME, 0 },
	390	{ }
	391	};
	392	MODULE_DEVICE_TABLE(i2c, usb3503_id);
	393
eab8050c DK	394	#ifdef CONFIG_OF
	395	static const struct of_device_id usb3503_of_match[] = {
	396	{ .compatible = "smsc,usb3503", },
5bdd1f4a	397	{ .compatible = "smsc,usb3503a", },
eab8050c DK	398	{},
	399	};
	400	MODULE_DEVICE_TABLE(of, usb3503_of_match);
	401	#endif
	402
3f0d1c67	403	static struct i2c_driver usb3503_i2c_driver = {
6a099c63 DK	404	.driver = {
6a099c63 DK	405	.name = USB3503_I2C_NAME,
ecdc071d	406	.pm = &usb3503_i2c_pm_ops,
eab8050c	407	.of_match_table = of_match_ptr(usb3503_of_match),
6a099c63	408	},
2487e3ee	409	.probe = usb3503_i2c_probe,
62c32e46	410	.remove = usb3503_i2c_remove,
6a099c63 DK	411	.id_table = usb3503_id,
	412	};
	413
3f0d1c67 MB	414	static struct platform_driver usb3503_platform_driver = {
	415	.driver = {
	416	.name = USB3503_I2C_NAME,
	417	.of_match_table = of_match_ptr(usb3503_of_match),
3f0d1c67 MB	418	},
3f0d1c67 MB	419	.probe = usb3503_platform_probe,
62c32e46	420	.remove = usb3503_platform_remove,
3f0d1c67 MB	421	};
	422
	423	static int __init usb3503_init(void)
	424	{
	425	int err;
	426
aa5b477d	427	err = i2c_add_driver(&usb3503_i2c_driver);
3f0d1c67 MB	428	if (err != 0)
	429	pr_err("usb3503: Failed to register I2C driver: %d\n", err);
	430
	431	err = platform_driver_register(&usb3503_platform_driver);
	432	if (err != 0)
	433	pr_err("usb3503: Failed to register platform driver: %d\n",
	434	err);
	435
	436	return 0;
	437	}
	438	module_init(usb3503_init);
	439
	440	static void __exit usb3503_exit(void)
	441	{
	442	platform_driver_unregister(&usb3503_platform_driver);
	443	i2c_del_driver(&usb3503_i2c_driver);
	444	}
	445	module_exit(usb3503_exit);
6a099c63 DK	446
	447	MODULE_AUTHOR("Dongjin Kim <tobetter@gmail.com>");
	448	MODULE_DESCRIPTION("USB3503 USB HUB driver");
	449	MODULE_LICENSE("GPL");