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