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13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/errno.h>
16#include <linux/i2c.h>
17#include <linux/slab.h>
18#include <linux/usb.h>
19
20#define OSIFI2C_READ 20
21#define OSIFI2C_WRITE 21
22#define OSIFI2C_STOP 22
23#define OSIFI2C_STATUS 23
24#define OSIFI2C_SET_BIT_RATE 24
25
26#define STATUS_ADDRESS_ACK 0
27#define STATUS_ADDRESS_NAK 2
28
29struct osif_priv {
30 struct usb_device *usb_dev;
31 struct usb_interface *interface;
32 struct i2c_adapter adapter;
33 unsigned char status;
34};
35
36static int osif_usb_read(struct i2c_adapter *adapter, int cmd,
37 int value, int index, void *data, int len)
38{
39 struct osif_priv *priv = adapter->algo_data;
40
41 return usb_control_msg(priv->usb_dev, usb_rcvctrlpipe(priv->usb_dev, 0),
42 cmd, USB_TYPE_VENDOR | USB_RECIP_INTERFACE |
43 USB_DIR_IN, value, index, data, len, 2000);
44}
45
46static int osif_usb_write(struct i2c_adapter *adapter, int cmd,
47 int value, int index, void *data, int len)
48{
49
50 struct osif_priv *priv = adapter->algo_data;
51
52 return usb_control_msg(priv->usb_dev, usb_sndctrlpipe(priv->usb_dev, 0),
53 cmd, USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
54 value, index, data, len, 2000);
55}
56
57static int osif_xfer(struct i2c_adapter *adapter, struct i2c_msg *msgs,
58 int num)
59{
60 struct osif_priv *priv = adapter->algo_data;
61 struct i2c_msg *pmsg;
62 int ret;
63 int i;
64
65 for (i = 0; i < num; i++) {
66 pmsg = &msgs[i];
67
68 if (pmsg->flags & I2C_M_RD) {
69 ret = osif_usb_read(adapter, OSIFI2C_READ,
70 pmsg->flags, pmsg->addr,
71 pmsg->buf, pmsg->len);
72 if (ret != pmsg->len) {
73 dev_err(&adapter->dev, "failure reading data\n");
74 return -EREMOTEIO;
75 }
76 } else {
77 ret = osif_usb_write(adapter, OSIFI2C_WRITE,
78 pmsg->flags, pmsg->addr,
79 pmsg->buf, pmsg->len);
80 if (ret != pmsg->len) {
81 dev_err(&adapter->dev, "failure writing data\n");
82 return -EREMOTEIO;
83 }
84 }
85
86 ret = osif_usb_write(adapter, OSIFI2C_STOP, 0, 0, NULL, 0);
87 if (ret) {
88 dev_err(&adapter->dev, "failure sending STOP\n");
89 return -EREMOTEIO;
90 }
91
92
93 ret = osif_usb_read(adapter, OSIFI2C_STATUS, 0, 0,
94 &priv->status, 1);
95 if (ret != 1) {
96 dev_err(&adapter->dev, "failure reading status\n");
97 return -EREMOTEIO;
98 }
99
100 if (priv->status != STATUS_ADDRESS_ACK) {
101 dev_dbg(&adapter->dev, "status = %d\n", priv->status);
102 return -EREMOTEIO;
103 }
104 }
105
106 return i;
107}
108
109static u32 osif_func(struct i2c_adapter *adapter)
110{
111 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
112}
113
114static const struct i2c_algorithm osif_algorithm = {
115 .master_xfer = osif_xfer,
116 .functionality = osif_func,
117};
118
119#define USB_OSIF_VENDOR_ID 0x1964
120#define USB_OSIF_PRODUCT_ID 0x0001
121
122static const struct usb_device_id osif_table[] = {
123 { USB_DEVICE(USB_OSIF_VENDOR_ID, USB_OSIF_PRODUCT_ID) },
124 { }
125};
126MODULE_DEVICE_TABLE(usb, osif_table);
127
128static int osif_probe(struct usb_interface *interface,
129 const struct usb_device_id *id)
130{
131 int ret;
132 struct osif_priv *priv;
133 u16 version;
134
135 priv = devm_kzalloc(&interface->dev, sizeof(*priv), GFP_KERNEL);
136 if (!priv)
137 return -ENOMEM;
138
139 priv->usb_dev = usb_get_dev(interface_to_usbdev(interface));
140 priv->interface = interface;
141
142 usb_set_intfdata(interface, priv);
143
144 priv->adapter.owner = THIS_MODULE;
145 priv->adapter.class = I2C_CLASS_HWMON;
146 priv->adapter.algo = &osif_algorithm;
147 priv->adapter.algo_data = priv;
148 snprintf(priv->adapter.name, sizeof(priv->adapter.name),
149 "OSIF at bus %03d device %03d",
150 priv->usb_dev->bus->busnum, priv->usb_dev->devnum);
151
152
153
154
155
156 ret = osif_usb_write(&priv->adapter, OSIFI2C_SET_BIT_RATE, 52, 0,
157 NULL, 0);
158 if (ret) {
159 dev_err(&interface->dev, "failure sending bit rate");
160 usb_put_dev(priv->usb_dev);
161 return ret;
162 }
163
164 i2c_add_adapter(&(priv->adapter));
165
166 version = le16_to_cpu(priv->usb_dev->descriptor.bcdDevice);
167 dev_info(&interface->dev,
168 "version %x.%02x found at bus %03d address %03d",
169 version >> 8, version & 0xff,
170 priv->usb_dev->bus->busnum, priv->usb_dev->devnum);
171
172 return 0;
173}
174
175static void osif_disconnect(struct usb_interface *interface)
176{
177 struct osif_priv *priv = usb_get_intfdata(interface);
178
179 i2c_del_adapter(&(priv->adapter));
180 usb_set_intfdata(interface, NULL);
181 usb_put_dev(priv->usb_dev);
182}
183
184static struct usb_driver osif_driver = {
185 .name = "RobotFuzz Open Source InterFace, OSIF",
186 .probe = osif_probe,
187 .disconnect = osif_disconnect,
188 .id_table = osif_table,
189};
190
191module_usb_driver(osif_driver);
192
193MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
194MODULE_AUTHOR("Barry Carter <barry.carter@robotfuzz.com>");
195MODULE_DESCRIPTION("RobotFuzz OSIF driver");
196MODULE_LICENSE("GPL v2");
197
