[linux-2.6-block.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>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#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>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
	14	#include <linux/module.h>
790d3a5a	15	#include <linux/mutex.h>
8b7c3b68	16	#include <linux/i2c.h>
790d3a5a	17	#include <linux/usb/phy.h>
c38a4f3f	18	#include <linux/usb/isp1301.h>
8b7c3b68 RS	19
	20	#define DRV_NAME "isp1301"
	21
790d3a5a FB	22	struct isp1301 {
	23	struct usb_phy phy;
	24	struct mutex mutex;
	25
	26	struct i2c_client *client;
	27	};
	28
c38a4f3f FB	29	#define phy_to_isp(p) (container_of((p), struct isp1301, phy))
c38a4f3f FB	30
8b7c3b68 RS	31	static const struct i2c_device_id isp1301_id[] = {
	32	{ "isp1301", 0 },
	33	{ }
	34	};
8fb7ab50	35	MODULE_DEVICE_TABLE(i2c, isp1301_id);
8b7c3b68	36
fd567653 JMC	37	static const struct of_device_id isp1301_of_match[] = {
	38	{.compatible = "nxp,isp1301" },
	39	{ },
	40	};
	41	MODULE_DEVICE_TABLE(of, isp1301_of_match);
	42
8b7c3b68 RS	43	static struct i2c_client *isp1301_i2c_client;
8b7c3b68 RS	44
c38a4f3f FB	45	static int __isp1301_write(struct isp1301 *isp, u8 reg, u8 value, u8 clear)
	46	{
	47	return i2c_smbus_write_byte_data(isp->client, reg \| clear, value);
	48	}
	49
	50	static int isp1301_write(struct isp1301 *isp, u8 reg, u8 value)
	51	{
	52	return __isp1301_write(isp, reg, value, 0);
	53	}
	54
	55	static int isp1301_clear(struct isp1301 *isp, u8 reg, u8 value)
	56	{
	57	return __isp1301_write(isp, reg, value, ISP1301_I2C_REG_CLEAR_ADDR);
	58	}
	59
	60	static int isp1301_phy_init(struct usb_phy *phy)
	61	{
	62	struct isp1301 *isp = phy_to_isp(phy);
	63
	64	/* Disable transparent UART mode first */
	65	isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_UART_EN);
	66	isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, ~MC1_SPEED_REG);
	67	isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG);
	68	isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_2, ~0);
	69	isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_2, (MC2_BI_DI \| MC2_PSW_EN
	70	\| MC2_SPD_SUSP_CTRL));
	71
	72	isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, ~0);
	73	isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0);
	74	isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLDOWN
	75	\| OTG1_DP_PULLDOWN));
	76	isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLUP
	77	\| OTG1_DP_PULLUP));
	78
	79	/* mask all interrupts */
	80	isp1301_clear(isp, ISP1301_I2C_INTERRUPT_LATCH, ~0);
	81	isp1301_clear(isp, ISP1301_I2C_INTERRUPT_FALLING, ~0);
	82	isp1301_clear(isp, ISP1301_I2C_INTERRUPT_RISING, ~0);
	83
	84	return 0;
	85	}
	86
	87	static int isp1301_phy_set_vbus(struct usb_phy *phy, int on)
	88	{
	89	struct isp1301 *isp = phy_to_isp(phy);
	90
	91	if (on)
	92	isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);
	93	else
	94	isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV);
	95
	96	return 0;
	97	}
	98
8b7c3b68 RS	99	static int isp1301_probe(struct i2c_client *client,
	100	const struct i2c_device_id *i2c_id)
	101	{
790d3a5a FB	102	struct isp1301 *isp;
	103	struct usb_phy *phy;
	104
	105	isp = devm_kzalloc(&client->dev, sizeof(*isp), GFP_KERNEL);
	106	if (!isp)
	107	return -ENOMEM;
	108
	109	isp->client = client;
	110	mutex_init(&isp->mutex);
	111
	112	phy = &isp->phy;
1abd8b31	113	phy->dev = &client->dev;
790d3a5a	114	phy->label = DRV_NAME;
c38a4f3f FB	115	phy->init = isp1301_phy_init;
c38a4f3f FB	116	phy->set_vbus = isp1301_phy_set_vbus;
790d3a5a FB	117	phy->type = USB_PHY_TYPE_USB2;
	118
	119	i2c_set_clientdata(client, isp);
	120	usb_add_phy_dev(phy);
	121
8b7c3b68	122	isp1301_i2c_client = client;
790d3a5a	123
8b7c3b68 RS	124	return 0;
	125	}
	126
	127	static int isp1301_remove(struct i2c_client *client)
	128	{
790d3a5a FB	129	struct isp1301 *isp = i2c_get_clientdata(client);
	130
	131	usb_remove_phy(&isp->phy);
	132	isp1301_i2c_client = NULL;
	133
8b7c3b68 RS	134	return 0;
	135	}
	136
	137	static struct i2c_driver isp1301_driver = {
	138	.driver = {
	139	.name = DRV_NAME,
a7f12a21	140	.of_match_table = isp1301_of_match,
8b7c3b68 RS	141	},
	142	.probe = isp1301_probe,
	143	.remove = isp1301_remove,
	144	.id_table = isp1301_id,
	145	};
	146
	147	module_i2c_driver(isp1301_driver);
	148
	149	static int match(struct device dev, void data)
	150	{
	151	struct device_node node = (struct device_node )data;
	152	return (dev->of_node == node) &&
	153	(dev->driver == &isp1301_driver.driver);
	154	}
	155
	156	struct i2c_client isp1301_get_client(struct device_node node)
	157	{
	158	if (node) { /* reference of ISP1301 I2C node via DT */
	159	struct device *dev = bus_find_device(&i2c_bus_type, NULL,
	160	node, match);
	161	if (!dev)
	162	return NULL;
	163	return to_i2c_client(dev);
	164	} else { /* non-DT: only one ISP1301 chip supported */
	165	return isp1301_i2c_client;
	166	}
	167	}
	168	EXPORT_SYMBOL_GPL(isp1301_get_client);
	169
	170	MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
	171	MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver");
	172	MODULE_LICENSE("GPL");