[mirror_ubuntu-bionic-kernel.git] / drivers / usb / phy / phy-isp1301.c

// SPDX-License-Identifier: GPL-2.0
/*
 * NXP ISP1301 USB transceiver driver
 *
 * Copyright (C) 2012 Roland Stigge
 *
 * Author: Roland Stigge <stigge@antcom.de>
 */

#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/i2c.h>
#include <linux/usb/phy.h>
#include <linux/usb/isp1301.h>

#define DRV_NAME		"isp1301"

struct isp1301 {
	struct usb_phy		phy;
	struct mutex		mutex;

	struct i2c_client	*client;
};

#define phy_to_isp(p)		(container_of((p), struct isp1301, phy))

static const struct i2c_device_id isp1301_id[] = {
	{ "isp1301", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, isp1301_id);

static const struct of_device_id isp1301_of_match[] = {
	{.compatible = "nxp,isp1301" },
	{ },
};
MODULE_DEVICE_TABLE(of, isp1301_of_match);

static struct i2c_client *isp1301_i2c_client;

static int __isp1301_write(struct isp1301 *isp, u8 reg, u8 value, u8 clear)
{
	return i2c_smbus_write_byte_data(isp->client, reg | clear, value);
}

static int isp1301_write(struct isp1301 *isp, u8 reg, u8 value)
{
	return __isp1301_write(isp, reg, value, 0);
}

static int isp1301_clear(struct isp1301 *isp, u8 reg, u8 value)
{
	return __isp1301_write(isp, reg, value, ISP1301_I2C_REG_CLEAR_ADDR);
}

static int isp1301_phy_init(struct usb_phy *phy)
{
	struct isp1301 *isp = phy_to_isp(phy);

	/* Disable transparent UART mode first */
	isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_UART_EN);
	isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, ~MC1_SPEED_REG);
	isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG);
	isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_2, ~0);
	isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_2, (MC2_BI_DI | MC2_PSW_EN
				| MC2_SPD_SUSP_CTRL));

	isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, ~0);
	isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0);
	isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLDOWN
				| OTG1_DP_PULLDOWN));
	isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLUP
				| OTG1_DP_PULLUP));

	/* mask all interrupts */
	isp1301_clear(isp, ISP1301_I2C_INTERRUPT_LATCH, ~0);
	isp1301_clear(isp, ISP1301_I2C_INTERRUPT_FALLING, ~0);
	isp1301_clear(isp, ISP1301_I2C_INTERRUPT_RISING, ~0);

	return 0;
}

static int isp1301_phy_set_vbus(struct usb_phy *phy, int on)
{
	struct isp1301 *isp = phy_to_isp(phy);

	if (on)
		isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);
	else
		isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);

	return 0;
}

static int isp1301_probe(struct i2c_client *client,
			 const struct i2c_device_id *i2c_id)
{
	struct isp1301 *isp;
	struct usb_phy *phy;

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

	isp->client = client;
	mutex_init(&isp->mutex);

	phy = &isp->phy;
	phy->dev = &client->dev;
	phy->label = DRV_NAME;
	phy->init = isp1301_phy_init;
	phy->set_vbus = isp1301_phy_set_vbus;
	phy->type = USB_PHY_TYPE_USB2;

	i2c_set_clientdata(client, isp);
	usb_add_phy_dev(phy);

	isp1301_i2c_client = client;

	return 0;
}

static int isp1301_remove(struct i2c_client *client)
{
	struct isp1301 *isp = i2c_get_clientdata(client);

	usb_remove_phy(&isp->phy);
	isp1301_i2c_client = NULL;

	return 0;
}

static struct i2c_driver isp1301_driver = {
	.driver = {
		.name = DRV_NAME,
		.of_match_table = isp1301_of_match,
	},
	.probe = isp1301_probe,
	.remove = isp1301_remove,
	.id_table = isp1301_id,
};

module_i2c_driver(isp1301_driver);

static int match(struct device *dev, void *data)
{
	struct device_node *node = (struct device_node *)data;
	return (dev->of_node == node) &&
		(dev->driver == &isp1301_driver.driver);
}

struct i2c_client *isp1301_get_client(struct device_node *node)
{
	if (node) { /* reference of ISP1301 I2C node via DT */
		struct device *dev = bus_find_device(&i2c_bus_type, NULL,
						     node, match);
		if (!dev)
			return NULL;
		return to_i2c_client(dev);
	} else { /* non-DT: only one ISP1301 chip supported */
		return isp1301_i2c_client;
	}
}
EXPORT_SYMBOL_GPL(isp1301_get_client);

MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
5fd54ace	1	// SPDX-License-Identifier: GPL-2.0
8b7c3b68 RS	2	/*
	3	* NXP ISP1301 USB transceiver driver
	4	*
	5	* Copyright (C) 2012 Roland Stigge
	6	*
	7	* Author: Roland Stigge <stigge@antcom.de>
8b7c3b68 RS	8	*/
	9
	10	#include <linux/module.h>
790d3a5a	11	#include <linux/mutex.h>
8b7c3b68	12	#include <linux/i2c.h>
790d3a5a	13	#include <linux/usb/phy.h>
c38a4f3f	14	#include <linux/usb/isp1301.h>
8b7c3b68 RS	15
	16	#define DRV_NAME "isp1301"
	17
790d3a5a FB	18	struct isp1301 {
	19	struct usb_phy phy;
	20	struct mutex mutex;
	21
	22	struct i2c_client *client;
	23	};
	24
c38a4f3f FB	25	#define phy_to_isp(p) (container_of((p), struct isp1301, phy))
c38a4f3f FB	26
8b7c3b68 RS	27	static const struct i2c_device_id isp1301_id[] = {
	28	{ "isp1301", 0 },
	29	{ }
	30	};
8fb7ab50	31	MODULE_DEVICE_TABLE(i2c, isp1301_id);
8b7c3b68	32
fd567653 JMC	33	static const struct of_device_id isp1301_of_match[] = {
	34	{.compatible = "nxp,isp1301" },
	35	{ },
	36	};
	37	MODULE_DEVICE_TABLE(of, isp1301_of_match);
	38
8b7c3b68 RS	39	static struct i2c_client *isp1301_i2c_client;
8b7c3b68 RS	40
c38a4f3f FB	41	static int __isp1301_write(struct isp1301 *isp, u8 reg, u8 value, u8 clear)
	42	{
	43	return i2c_smbus_write_byte_data(isp->client, reg \| clear, value);
	44	}
	45
	46	static int isp1301_write(struct isp1301 *isp, u8 reg, u8 value)
	47	{
	48	return __isp1301_write(isp, reg, value, 0);
	49	}
	50
	51	static int isp1301_clear(struct isp1301 *isp, u8 reg, u8 value)
	52	{
	53	return __isp1301_write(isp, reg, value, ISP1301_I2C_REG_CLEAR_ADDR);
	54	}
	55
	56	static int isp1301_phy_init(struct usb_phy *phy)
	57	{
	58	struct isp1301 *isp = phy_to_isp(phy);
	59
	60	/* Disable transparent UART mode first */
	61	isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_UART_EN);
	62	isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, ~MC1_SPEED_REG);
	63	isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG);
	64	isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_2, ~0);
	65	isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_2, (MC2_BI_DI \| MC2_PSW_EN
	66	\| MC2_SPD_SUSP_CTRL));
	67
	68	isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, ~0);
	69	isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0);
	70	isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLDOWN
	71	\| OTG1_DP_PULLDOWN));
	72	isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLUP
	73	\| OTG1_DP_PULLUP));
	74
	75	/* mask all interrupts */
	76	isp1301_clear(isp, ISP1301_I2C_INTERRUPT_LATCH, ~0);
	77	isp1301_clear(isp, ISP1301_I2C_INTERRUPT_FALLING, ~0);
	78	isp1301_clear(isp, ISP1301_I2C_INTERRUPT_RISING, ~0);
	79
	80	return 0;
	81	}
	82
	83	static int isp1301_phy_set_vbus(struct usb_phy *phy, int on)
	84	{
	85	struct isp1301 *isp = phy_to_isp(phy);
	86
	87	if (on)
	88	isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);
	89	else
	90	isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);
	91
	92	return 0;
	93	}
	94
8b7c3b68 RS	95	static int isp1301_probe(struct i2c_client *client,
	96	const struct i2c_device_id *i2c_id)
	97	{
790d3a5a FB	98	struct isp1301 *isp;
	99	struct usb_phy *phy;
	100
	101	isp = devm_kzalloc(&client->dev, sizeof(*isp), GFP_KERNEL);
	102	if (!isp)
	103	return -ENOMEM;
	104
	105	isp->client = client;
	106	mutex_init(&isp->mutex);
	107
	108	phy = &isp->phy;
1abd8b31	109	phy->dev = &client->dev;
790d3a5a	110	phy->label = DRV_NAME;
c38a4f3f FB	111	phy->init = isp1301_phy_init;
c38a4f3f FB	112	phy->set_vbus = isp1301_phy_set_vbus;
790d3a5a FB	113	phy->type = USB_PHY_TYPE_USB2;
	114
	115	i2c_set_clientdata(client, isp);
	116	usb_add_phy_dev(phy);
	117
8b7c3b68	118	isp1301_i2c_client = client;
790d3a5a	119
8b7c3b68 RS	120	return 0;
	121	}
	122
	123	static int isp1301_remove(struct i2c_client *client)
	124	{
790d3a5a FB	125	struct isp1301 *isp = i2c_get_clientdata(client);
	126
	127	usb_remove_phy(&isp->phy);
	128	isp1301_i2c_client = NULL;
	129
8b7c3b68 RS	130	return 0;
	131	}
	132
	133	static struct i2c_driver isp1301_driver = {
	134	.driver = {
	135	.name = DRV_NAME,
a7f12a21	136	.of_match_table = isp1301_of_match,
8b7c3b68 RS	137	},
	138	.probe = isp1301_probe,
	139	.remove = isp1301_remove,
	140	.id_table = isp1301_id,
	141	};
	142
	143	module_i2c_driver(isp1301_driver);
	144
	145	static int match(struct device dev, void data)
	146	{
	147	struct device_node node = (struct device_node )data;
	148	return (dev->of_node == node) &&
	149	(dev->driver == &isp1301_driver.driver);
	150	}
	151
	152	struct i2c_client isp1301_get_client(struct device_node node)
	153	{
	154	if (node) { /* reference of ISP1301 I2C node via DT */
	155	struct device *dev = bus_find_device(&i2c_bus_type, NULL,
	156	node, match);
	157	if (!dev)
	158	return NULL;
	159	return to_i2c_client(dev);
	160	} else { /* non-DT: only one ISP1301 chip supported */
	161	return isp1301_i2c_client;
	162	}
	163	}
	164	EXPORT_SYMBOL_GPL(isp1301_get_client);
	165
	166	MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
	167	MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver");
	168	MODULE_LICENSE("GPL");