GNU Linux-libre 6.7.9-gnu
[releases.git] / drivers / usb / phy / phy-isp1301.c
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
18 struct 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
27 static const struct i2c_device_id isp1301_id[] = {
28         { "isp1301", 0 },
29         { }
30 };
31 MODULE_DEVICE_TABLE(i2c, isp1301_id);
32
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
39 static struct i2c_client *isp1301_i2c_client;
40
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
95 static 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
122 static 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
130 static 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
140 module_i2c_driver(isp1301_driver);
141
142 struct 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 }
154 EXPORT_SYMBOL_GPL(isp1301_get_client);
155
156 MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
157 MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver");
158 MODULE_LICENSE("GPL");