1// SPDX-License-Identifier: GPL-2.0
2/*
3 * NXP ISP1301 USB transceiver driver
4 *
5 * Copyright (C) 2012 Roland Stigge
6 *
7 * Author: Roland Stigge <stigge@antcom.de>
8 */
9
10#include <linux/module.h>
11#include <linux/mutex.h>
12#include <linux/i2c.h>
13#include <linux/usb/phy.h>
14#include <linux/usb/isp1301.h>
15
16#define DRV_NAME		"isp1301"
17
18struct isp1301 {
19	struct usb_phy		phy;
20	struct mutex		mutex;
21
22	struct i2c_client	*client;
23};
24
25#define phy_to_isp(p)		(container_of((p), struct isp1301, phy))
26
27static const struct i2c_device_id isp1301_id[] = {
28	{ "isp1301", 0 },
29	{ }
30};
31MODULE_DEVICE_TABLE(i2c, isp1301_id);
32
33static const struct of_device_id isp1301_of_match[] = {
34	{.compatible = "nxp,isp1301" },
35	{ },
36};
37MODULE_DEVICE_TABLE(of, isp1301_of_match);
38
39static struct i2c_client *isp1301_i2c_client;
40
41static 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
46static int isp1301_write(struct isp1301 *isp, u8 reg, u8 value)
47{
48	return __isp1301_write(isp, reg, value, 0);
49}
50
51static 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
56static 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
83static 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
95static int isp1301_probe(struct i2c_client *client)
96{
97	struct isp1301 *isp;
98	struct usb_phy *phy;
99
100	isp = devm_kzalloc(&client->dev, sizeof(*isp), GFP_KERNEL);
101	if (!isp)
102		return -ENOMEM;
103
104	isp->client = client;
105	mutex_init(&isp->mutex);
106
107	phy = &isp->phy;
108	phy->dev = &client->dev;
109	phy->label = DRV_NAME;
110	phy->init = isp1301_phy_init;
111	phy->set_vbus = isp1301_phy_set_vbus;
112	phy->type = USB_PHY_TYPE_USB2;
113
114	i2c_set_clientdata(client, isp);
115	usb_add_phy_dev(phy);
116
117	isp1301_i2c_client = client;
118
119	return 0;
120}
121
122static void isp1301_remove(struct i2c_client *client)
123{
124	struct isp1301 *isp = i2c_get_clientdata(client);
125
126	usb_remove_phy(&isp->phy);
127	isp1301_i2c_client = NULL;
128}
129
130static struct i2c_driver isp1301_driver = {
131	.driver = {
132		.name = DRV_NAME,
133		.of_match_table = isp1301_of_match,
134	},
135	.probe = isp1301_probe,
136	.remove = isp1301_remove,
137	.id_table = isp1301_id,
138};
139
140module_i2c_driver(isp1301_driver);
141
142struct i2c_client *isp1301_get_client(struct device_node *node)
143{
144	struct i2c_client *client;
145
146	/* reference of ISP1301 I2C node via DT */
147	client = of_find_i2c_device_by_node(node);
148	if (client)
149		return client;
150
151	/* non-DT: only one ISP1301 chip supported */
152	return isp1301_i2c_client;
153}
154EXPORT_SYMBOL_GPL(isp1301_get_client);
155
156MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
157MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver");
158MODULE_LICENSE("GPL");
159