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1 /*
2  * Driver for ST5481 USB ISDN modem
3  *
4  * Author       Frode Isaksen
5  * Copyright    2001 by Frode Isaksen      <fisaksen@bewan.com>
6  *              2001 by Kai Germaschewski  <kai.germaschewski@gmx.de>
7  *
8  * This software may be used and distributed according to the terms
9  * of the GNU General Public License, incorporated herein by reference.
10  *
11  */
12 
13 /*
14  * TODO:
15  *
16  * b layer1 delay?
17  * hotplug / unregister issues
18  * mod_inc/dec_use_count
19  * unify parts of d/b channel usb handling
20  * file header
21  * avoid copy to isoc buffer?
22  * improve usb delay?
23  * merge l1 state machines?
24  * clean up debug
25  */
26 
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/usb.h>
30 #include <linux/slab.h>
31 #include "st5481.h"
32 
33 MODULE_DESCRIPTION("ISDN4Linux: driver for ST5481 USB ISDN adapter");
34 MODULE_AUTHOR("Frode Isaksen");
35 MODULE_LICENSE("GPL");
36 
37 static int protocol = 2;       /* EURO-ISDN Default */
38 module_param(protocol, int, 0);
39 
40 static int number_of_leds = 2;       /* 2 LEDs on the adpater default */
41 module_param(number_of_leds, int, 0);
42 
43 #ifdef CONFIG_HISAX_DEBUG
44 static int debug = 0;
45 module_param(debug, int, 0);
46 #endif
47 int st5481_debug;
48 
49 /* ======================================================================
50  * registration/deregistration with the USB layer
51  */
52 
53 /*
54  * This function will be called when the adapter is plugged
55  * into the USB bus.
56  */
probe_st5481(struct usb_interface * intf,const struct usb_device_id * id)57 static int probe_st5481(struct usb_interface *intf,
58 			const struct usb_device_id *id)
59 {
60 	struct usb_device *dev = interface_to_usbdev(intf);
61 	struct st5481_adapter *adapter;
62 	struct hisax_b_if *b_if[2];
63 	int retval, i;
64 
65 	printk(KERN_INFO "st541: found adapter VendorId %04x, ProductId %04x, LEDs %d\n",
66 	       le16_to_cpu(dev->descriptor.idVendor),
67 	       le16_to_cpu(dev->descriptor.idProduct),
68 	       number_of_leds);
69 
70 	adapter = kzalloc(sizeof(struct st5481_adapter), GFP_KERNEL);
71 	if (!adapter)
72 		return -ENOMEM;
73 
74 	adapter->number_of_leds = number_of_leds;
75 	adapter->usb_dev = dev;
76 
77 	adapter->hisax_d_if.owner = THIS_MODULE;
78 	adapter->hisax_d_if.ifc.priv = adapter;
79 	adapter->hisax_d_if.ifc.l2l1 = st5481_d_l2l1;
80 
81 	for (i = 0; i < 2; i++) {
82 		adapter->bcs[i].adapter = adapter;
83 		adapter->bcs[i].channel = i;
84 		adapter->bcs[i].b_if.ifc.priv = &adapter->bcs[i];
85 		adapter->bcs[i].b_if.ifc.l2l1 = st5481_b_l2l1;
86 	}
87 
88 	retval = st5481_setup_usb(adapter);
89 	if (retval < 0)
90 		goto err;
91 
92 	retval = st5481_setup_d(adapter);
93 	if (retval < 0)
94 		goto err_usb;
95 
96 	retval = st5481_setup_b(&adapter->bcs[0]);
97 	if (retval < 0)
98 		goto err_d;
99 
100 	retval = st5481_setup_b(&adapter->bcs[1]);
101 	if (retval < 0)
102 		goto err_b;
103 
104 	for (i = 0; i < 2; i++)
105 		b_if[i] = &adapter->bcs[i].b_if;
106 
107 	if (hisax_register(&adapter->hisax_d_if, b_if, "st5481_usb",
108 			   protocol) != 0)
109 		goto err_b1;
110 
111 	st5481_start(adapter);
112 
113 	usb_set_intfdata(intf, adapter);
114 	return 0;
115 
116 err_b1:
117 	st5481_release_b(&adapter->bcs[1]);
118 err_b:
119 	st5481_release_b(&adapter->bcs[0]);
120 err_d:
121 	st5481_release_d(adapter);
122 err_usb:
123 	st5481_release_usb(adapter);
124 err:
125 	kfree(adapter);
126 	return -EIO;
127 }
128 
129 /*
130  * This function will be called when the adapter is removed
131  * from the USB bus.
132  */
disconnect_st5481(struct usb_interface * intf)133 static void disconnect_st5481(struct usb_interface *intf)
134 {
135 	struct st5481_adapter *adapter = usb_get_intfdata(intf);
136 
137 	DBG(1, "");
138 
139 	usb_set_intfdata(intf, NULL);
140 	if (!adapter)
141 		return;
142 
143 	st5481_stop(adapter);
144 	st5481_release_b(&adapter->bcs[1]);
145 	st5481_release_b(&adapter->bcs[0]);
146 	st5481_release_d(adapter);
147 	// we would actually better wait for completion of outstanding urbs
148 	mdelay(2);
149 	st5481_release_usb(adapter);
150 
151 	hisax_unregister(&adapter->hisax_d_if);
152 
153 	kfree(adapter);
154 }
155 
156 /*
157  * The last 4 bits in the Product Id is set with 4 pins on the chip.
158  */
159 static struct usb_device_id st5481_ids[] = {
160 	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID + 0x0) },
161 	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID + 0x1) },
162 	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID + 0x2) },
163 	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID + 0x3) },
164 	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID + 0x4) },
165 	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID + 0x5) },
166 	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID + 0x6) },
167 	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID + 0x7) },
168 	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID + 0x8) },
169 	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID + 0x9) },
170 	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID + 0xA) },
171 	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID + 0xB) },
172 	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID + 0xC) },
173 	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID + 0xD) },
174 	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID + 0xE) },
175 	{ USB_DEVICE(ST_VENDOR_ID, ST5481_PRODUCT_ID + 0xF) },
176 	{ }
177 };
178 MODULE_DEVICE_TABLE(usb, st5481_ids);
179 
180 static struct usb_driver st5481_usb_driver = {
181 	.name =		"st5481_usb",
182 	.probe =	probe_st5481,
183 	.disconnect =	disconnect_st5481,
184 	.id_table =	st5481_ids,
185 	.disable_hub_initiated_lpm = 1,
186 };
187 
st5481_usb_init(void)188 static int __init st5481_usb_init(void)
189 {
190 	int retval;
191 
192 #ifdef CONFIG_HISAX_DEBUG
193 	st5481_debug = debug;
194 #endif
195 
196 	printk(KERN_INFO "hisax_st5481: ST5481 USB ISDN driver $Revision: 2.4.2.3 $\n");
197 
198 	retval = st5481_d_init();
199 	if (retval < 0)
200 		goto out;
201 
202 	retval = usb_register(&st5481_usb_driver);
203 	if (retval < 0)
204 		goto out_d_exit;
205 
206 	return 0;
207 
208 out_d_exit:
209 	st5481_d_exit();
210 out:
211 	return retval;
212 }
213 
st5481_usb_exit(void)214 static void __exit st5481_usb_exit(void)
215 {
216 	usb_deregister(&st5481_usb_driver);
217 	st5481_d_exit();
218 }
219 
220 module_init(st5481_usb_init);
221 module_exit(st5481_usb_exit);
222