tjh.dev
Linux kernel mirror (for testing)
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linux
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 const struct i2c_device_id *i2c_id)
97{
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;
109 phy->dev = &client->dev;
110 phy->label = DRV_NAME;
111 phy->init = isp1301_phy_init;
112 phy->set_vbus = isp1301_phy_set_vbus;
113 phy->type = USB_PHY_TYPE_USB2;
114
115 i2c_set_clientdata(client, isp);
116 usb_add_phy_dev(phy);
117
118 isp1301_i2c_client = client;
119
120 return 0;
121}
122
123static void isp1301_remove(struct i2c_client *client)
124{
125 struct isp1301 *isp = i2c_get_clientdata(client);
126
127 usb_remove_phy(&isp->phy);
128 isp1301_i2c_client = NULL;
129}
130
131static struct i2c_driver isp1301_driver = {
132 .driver = {
133 .name = DRV_NAME,
134 .of_match_table = isp1301_of_match,
135 },
136 .probe = isp1301_probe,
137 .remove = isp1301_remove,
138 .id_table = isp1301_id,
139};
140
141module_i2c_driver(isp1301_driver);
142
143struct i2c_client *isp1301_get_client(struct device_node *node)
144{
145 struct i2c_client *client;
146
147 /* reference of ISP1301 I2C node via DT */
148 client = of_find_i2c_device_by_node(node);
149 if (client)
150 return client;
151
152 /* non-DT: only one ISP1301 chip supported */
153 return isp1301_i2c_client;
154}
155EXPORT_SYMBOL_GPL(isp1301_get_client);
156
157MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
158MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver");
159MODULE_LICENSE("GPL");