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5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0 |
ce21bfe6 PA |
2 | /* |
3 | * drivers/usb/misc/lvstest.c | |
4 | * | |
5 | * Test pattern generation for Link Layer Validation System Tests | |
6 | * | |
7 | * Copyright (C) 2014 ST Microelectronics | |
e34cadde | 8 | * Pratyush Anand <pratyush.anand@gmail.com> |
ce21bfe6 PA |
9 | */ |
10 | ||
11 | #include <linux/init.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/usb.h> | |
17 | #include <linux/usb/ch11.h> | |
18 | #include <linux/usb/hcd.h> | |
19 | #include <linux/usb/phy.h> | |
20 | ||
21 | struct lvs_rh { | |
22 | /* root hub interface */ | |
23 | struct usb_interface *intf; | |
24 | /* if lvs device connected */ | |
25 | bool present; | |
26 | /* port no at which lvs device is present */ | |
27 | int portnum; | |
28 | /* urb buffer */ | |
29 | u8 buffer[8]; | |
30 | /* class descriptor */ | |
31 | struct usb_hub_descriptor descriptor; | |
32 | /* urb for polling interrupt pipe */ | |
33 | struct urb *urb; | |
ce21bfe6 PA |
34 | /* LVH RH work */ |
35 | struct work_struct rh_work; | |
36 | /* RH port status */ | |
37 | struct usb_port_status port_status; | |
38 | }; | |
39 | ||
40 | static struct usb_device *create_lvs_device(struct usb_interface *intf) | |
41 | { | |
42 | struct usb_device *udev, *hdev; | |
43 | struct usb_hcd *hcd; | |
44 | struct lvs_rh *lvs = usb_get_intfdata(intf); | |
45 | ||
46 | if (!lvs->present) { | |
47 | dev_err(&intf->dev, "No LVS device is present\n"); | |
48 | return NULL; | |
49 | } | |
50 | ||
51 | hdev = interface_to_usbdev(intf); | |
52 | hcd = bus_to_hcd(hdev->bus); | |
53 | ||
54 | udev = usb_alloc_dev(hdev, hdev->bus, lvs->portnum); | |
55 | if (!udev) { | |
56 | dev_err(&intf->dev, "Could not allocate lvs udev\n"); | |
57 | return NULL; | |
58 | } | |
59 | udev->speed = USB_SPEED_SUPER; | |
60 | udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); | |
61 | usb_set_device_state(udev, USB_STATE_DEFAULT); | |
62 | ||
63 | if (hcd->driver->enable_device) { | |
64 | if (hcd->driver->enable_device(hcd, udev) < 0) { | |
65 | dev_err(&intf->dev, "Failed to enable\n"); | |
66 | usb_put_dev(udev); | |
67 | return NULL; | |
68 | } | |
69 | } | |
70 | ||
71 | return udev; | |
72 | } | |
73 | ||
74 | static void destroy_lvs_device(struct usb_device *udev) | |
75 | { | |
76 | struct usb_device *hdev = udev->parent; | |
77 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); | |
78 | ||
79 | if (hcd->driver->free_dev) | |
80 | hcd->driver->free_dev(hcd, udev); | |
81 | ||
82 | usb_put_dev(udev); | |
83 | } | |
84 | ||
85 | static int lvs_rh_clear_port_feature(struct usb_device *hdev, | |
86 | int port1, int feature) | |
87 | { | |
88 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
89 | USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, | |
90 | NULL, 0, 1000); | |
91 | } | |
92 | ||
93 | static int lvs_rh_set_port_feature(struct usb_device *hdev, | |
94 | int port1, int feature) | |
95 | { | |
96 | return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), | |
97 | USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, | |
98 | NULL, 0, 1000); | |
99 | } | |
100 | ||
101 | static ssize_t u3_entry_store(struct device *dev, | |
102 | struct device_attribute *attr, const char *buf, size_t count) | |
103 | { | |
104 | struct usb_interface *intf = to_usb_interface(dev); | |
105 | struct usb_device *hdev = interface_to_usbdev(intf); | |
106 | struct lvs_rh *lvs = usb_get_intfdata(intf); | |
107 | struct usb_device *udev; | |
108 | int ret; | |
109 | ||
110 | udev = create_lvs_device(intf); | |
111 | if (!udev) { | |
112 | dev_err(dev, "failed to create lvs device\n"); | |
113 | return -ENOMEM; | |
114 | } | |
115 | ||
116 | ret = lvs_rh_set_port_feature(hdev, lvs->portnum, | |
117 | USB_PORT_FEAT_SUSPEND); | |
118 | if (ret < 0) | |
119 | dev_err(dev, "can't issue U3 entry %d\n", ret); | |
120 | ||
121 | destroy_lvs_device(udev); | |
122 | ||
123 | if (ret < 0) | |
124 | return ret; | |
125 | ||
126 | return count; | |
127 | } | |
128 | static DEVICE_ATTR_WO(u3_entry); | |
129 | ||
130 | static ssize_t u3_exit_store(struct device *dev, | |
131 | struct device_attribute *attr, const char *buf, size_t count) | |
132 | { | |
133 | struct usb_interface *intf = to_usb_interface(dev); | |
134 | struct usb_device *hdev = interface_to_usbdev(intf); | |
135 | struct lvs_rh *lvs = usb_get_intfdata(intf); | |
136 | struct usb_device *udev; | |
137 | int ret; | |
138 | ||
139 | udev = create_lvs_device(intf); | |
140 | if (!udev) { | |
141 | dev_err(dev, "failed to create lvs device\n"); | |
142 | return -ENOMEM; | |
143 | } | |
144 | ||
145 | ret = lvs_rh_clear_port_feature(hdev, lvs->portnum, | |
146 | USB_PORT_FEAT_SUSPEND); | |
147 | if (ret < 0) | |
148 | dev_err(dev, "can't issue U3 exit %d\n", ret); | |
149 | ||
150 | destroy_lvs_device(udev); | |
151 | ||
152 | if (ret < 0) | |
153 | return ret; | |
154 | ||
155 | return count; | |
156 | } | |
157 | static DEVICE_ATTR_WO(u3_exit); | |
158 | ||
159 | static ssize_t hot_reset_store(struct device *dev, | |
160 | struct device_attribute *attr, const char *buf, size_t count) | |
161 | { | |
162 | struct usb_interface *intf = to_usb_interface(dev); | |
163 | struct usb_device *hdev = interface_to_usbdev(intf); | |
164 | struct lvs_rh *lvs = usb_get_intfdata(intf); | |
165 | int ret; | |
166 | ||
167 | ret = lvs_rh_set_port_feature(hdev, lvs->portnum, | |
168 | USB_PORT_FEAT_RESET); | |
169 | if (ret < 0) { | |
170 | dev_err(dev, "can't issue hot reset %d\n", ret); | |
171 | return ret; | |
172 | } | |
173 | ||
174 | return count; | |
175 | } | |
176 | static DEVICE_ATTR_WO(hot_reset); | |
177 | ||
f624ec70 JP |
178 | static ssize_t warm_reset_store(struct device *dev, |
179 | struct device_attribute *attr, const char *buf, size_t count) | |
180 | { | |
181 | struct usb_interface *intf = to_usb_interface(dev); | |
182 | struct usb_device *hdev = interface_to_usbdev(intf); | |
183 | struct lvs_rh *lvs = usb_get_intfdata(intf); | |
184 | int ret; | |
185 | ||
186 | ret = lvs_rh_set_port_feature(hdev, lvs->portnum, | |
187 | USB_PORT_FEAT_BH_PORT_RESET); | |
188 | if (ret < 0) { | |
189 | dev_err(dev, "can't issue warm reset %d\n", ret); | |
190 | return ret; | |
191 | } | |
192 | ||
193 | return count; | |
194 | } | |
195 | static DEVICE_ATTR_WO(warm_reset); | |
196 | ||
ce21bfe6 PA |
197 | static ssize_t u2_timeout_store(struct device *dev, |
198 | struct device_attribute *attr, const char *buf, size_t count) | |
199 | { | |
200 | struct usb_interface *intf = to_usb_interface(dev); | |
201 | struct usb_device *hdev = interface_to_usbdev(intf); | |
202 | struct lvs_rh *lvs = usb_get_intfdata(intf); | |
203 | unsigned long val; | |
204 | int ret; | |
205 | ||
206 | ret = kstrtoul(buf, 10, &val); | |
207 | if (ret < 0) { | |
208 | dev_err(dev, "couldn't parse string %d\n", ret); | |
209 | return ret; | |
210 | } | |
211 | ||
144a3cbe | 212 | if (val > 127) |
ce21bfe6 PA |
213 | return -EINVAL; |
214 | ||
215 | ret = lvs_rh_set_port_feature(hdev, lvs->portnum | (val << 8), | |
216 | USB_PORT_FEAT_U2_TIMEOUT); | |
217 | if (ret < 0) { | |
218 | dev_err(dev, "Error %d while setting U2 timeout %ld\n", ret, val); | |
219 | return ret; | |
220 | } | |
221 | ||
222 | return count; | |
223 | } | |
224 | static DEVICE_ATTR_WO(u2_timeout); | |
225 | ||
226 | static ssize_t u1_timeout_store(struct device *dev, | |
227 | struct device_attribute *attr, const char *buf, size_t count) | |
228 | { | |
229 | struct usb_interface *intf = to_usb_interface(dev); | |
230 | struct usb_device *hdev = interface_to_usbdev(intf); | |
231 | struct lvs_rh *lvs = usb_get_intfdata(intf); | |
232 | unsigned long val; | |
233 | int ret; | |
234 | ||
235 | ret = kstrtoul(buf, 10, &val); | |
236 | if (ret < 0) { | |
237 | dev_err(dev, "couldn't parse string %d\n", ret); | |
238 | return ret; | |
239 | } | |
240 | ||
b7963dac | 241 | if (val > 127) |
ce21bfe6 PA |
242 | return -EINVAL; |
243 | ||
244 | ret = lvs_rh_set_port_feature(hdev, lvs->portnum | (val << 8), | |
245 | USB_PORT_FEAT_U1_TIMEOUT); | |
246 | if (ret < 0) { | |
247 | dev_err(dev, "Error %d while setting U1 timeout %ld\n", ret, val); | |
248 | return ret; | |
249 | } | |
250 | ||
251 | return count; | |
252 | } | |
253 | static DEVICE_ATTR_WO(u1_timeout); | |
254 | ||
255 | static ssize_t get_dev_desc_store(struct device *dev, | |
256 | struct device_attribute *attr, const char *buf, size_t count) | |
257 | { | |
258 | struct usb_interface *intf = to_usb_interface(dev); | |
259 | struct usb_device *udev; | |
260 | struct usb_device_descriptor *descriptor; | |
261 | int ret; | |
262 | ||
263 | descriptor = kmalloc(sizeof(*descriptor), GFP_KERNEL); | |
5c47fd61 | 264 | if (!descriptor) |
ce21bfe6 | 265 | return -ENOMEM; |
ce21bfe6 PA |
266 | |
267 | udev = create_lvs_device(intf); | |
268 | if (!udev) { | |
269 | dev_err(dev, "failed to create lvs device\n"); | |
270 | ret = -ENOMEM; | |
271 | goto free_desc; | |
272 | } | |
273 | ||
274 | ret = usb_control_msg(udev, (PIPE_CONTROL << 30) | USB_DIR_IN, | |
275 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, USB_DT_DEVICE << 8, | |
276 | 0, descriptor, sizeof(*descriptor), | |
277 | USB_CTRL_GET_TIMEOUT); | |
278 | if (ret < 0) | |
279 | dev_err(dev, "can't read device descriptor %d\n", ret); | |
280 | ||
281 | destroy_lvs_device(udev); | |
282 | ||
283 | free_desc: | |
284 | kfree(descriptor); | |
285 | ||
286 | if (ret < 0) | |
287 | return ret; | |
288 | ||
289 | return count; | |
290 | } | |
291 | static DEVICE_ATTR_WO(get_dev_desc); | |
292 | ||
f624ec70 JP |
293 | static ssize_t enable_compliance_store(struct device *dev, |
294 | struct device_attribute *attr, const char *buf, size_t count) | |
295 | { | |
296 | struct usb_interface *intf = to_usb_interface(dev); | |
297 | struct usb_device *hdev = interface_to_usbdev(intf); | |
298 | struct lvs_rh *lvs = usb_get_intfdata(intf); | |
299 | int ret; | |
300 | ||
301 | ret = lvs_rh_set_port_feature(hdev, | |
302 | lvs->portnum | USB_SS_PORT_LS_COMP_MOD << 3, | |
303 | USB_PORT_FEAT_LINK_STATE); | |
304 | if (ret < 0) { | |
305 | dev_err(dev, "can't enable compliance mode %d\n", ret); | |
306 | return ret; | |
307 | } | |
308 | ||
309 | return count; | |
310 | } | |
311 | static DEVICE_ATTR_WO(enable_compliance); | |
312 | ||
899ad6d6 | 313 | static struct attribute *lvs_attrs[] = { |
ce21bfe6 PA |
314 | &dev_attr_get_dev_desc.attr, |
315 | &dev_attr_u1_timeout.attr, | |
316 | &dev_attr_u2_timeout.attr, | |
317 | &dev_attr_hot_reset.attr, | |
f624ec70 | 318 | &dev_attr_warm_reset.attr, |
ce21bfe6 PA |
319 | &dev_attr_u3_entry.attr, |
320 | &dev_attr_u3_exit.attr, | |
f624ec70 | 321 | &dev_attr_enable_compliance.attr, |
ce21bfe6 PA |
322 | NULL |
323 | }; | |
899ad6d6 | 324 | ATTRIBUTE_GROUPS(lvs); |
ce21bfe6 PA |
325 | |
326 | static void lvs_rh_work(struct work_struct *work) | |
327 | { | |
328 | struct lvs_rh *lvs = container_of(work, struct lvs_rh, rh_work); | |
329 | struct usb_interface *intf = lvs->intf; | |
330 | struct usb_device *hdev = interface_to_usbdev(intf); | |
331 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); | |
332 | struct usb_hub_descriptor *descriptor = &lvs->descriptor; | |
333 | struct usb_port_status *port_status = &lvs->port_status; | |
334 | int i, ret = 0; | |
335 | u16 portchange; | |
336 | ||
337 | /* Examine each root port */ | |
338 | for (i = 1; i <= descriptor->bNbrPorts; i++) { | |
339 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
340 | USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, i, | |
341 | port_status, sizeof(*port_status), 1000); | |
342 | if (ret < 4) | |
343 | continue; | |
344 | ||
b1bd3f1a | 345 | portchange = le16_to_cpu(port_status->wPortChange); |
ce21bfe6 PA |
346 | |
347 | if (portchange & USB_PORT_STAT_C_LINK_STATE) | |
348 | lvs_rh_clear_port_feature(hdev, i, | |
349 | USB_PORT_FEAT_C_PORT_LINK_STATE); | |
350 | if (portchange & USB_PORT_STAT_C_ENABLE) | |
351 | lvs_rh_clear_port_feature(hdev, i, | |
352 | USB_PORT_FEAT_C_ENABLE); | |
353 | if (portchange & USB_PORT_STAT_C_RESET) | |
354 | lvs_rh_clear_port_feature(hdev, i, | |
355 | USB_PORT_FEAT_C_RESET); | |
356 | if (portchange & USB_PORT_STAT_C_BH_RESET) | |
357 | lvs_rh_clear_port_feature(hdev, i, | |
358 | USB_PORT_FEAT_C_BH_PORT_RESET); | |
359 | if (portchange & USB_PORT_STAT_C_CONNECTION) { | |
360 | lvs_rh_clear_port_feature(hdev, i, | |
361 | USB_PORT_FEAT_C_CONNECTION); | |
362 | ||
b1bd3f1a | 363 | if (le16_to_cpu(port_status->wPortStatus) & |
ce21bfe6 PA |
364 | USB_PORT_STAT_CONNECTION) { |
365 | lvs->present = true; | |
366 | lvs->portnum = i; | |
3d46e73d AT |
367 | if (hcd->usb_phy) |
368 | usb_phy_notify_connect(hcd->usb_phy, | |
ce21bfe6 PA |
369 | USB_SPEED_SUPER); |
370 | } else { | |
371 | lvs->present = false; | |
3d46e73d AT |
372 | if (hcd->usb_phy) |
373 | usb_phy_notify_disconnect(hcd->usb_phy, | |
ce21bfe6 PA |
374 | USB_SPEED_SUPER); |
375 | } | |
376 | break; | |
377 | } | |
378 | } | |
379 | ||
380 | ret = usb_submit_urb(lvs->urb, GFP_KERNEL); | |
381 | if (ret != 0 && ret != -ENODEV && ret != -EPERM) | |
382 | dev_err(&intf->dev, "urb resubmit error %d\n", ret); | |
383 | } | |
384 | ||
385 | static void lvs_rh_irq(struct urb *urb) | |
386 | { | |
387 | struct lvs_rh *lvs = urb->context; | |
388 | ||
bd783108 | 389 | schedule_work(&lvs->rh_work); |
ce21bfe6 PA |
390 | } |
391 | ||
392 | static int lvs_rh_probe(struct usb_interface *intf, | |
393 | const struct usb_device_id *id) | |
394 | { | |
395 | struct usb_device *hdev; | |
396 | struct usb_host_interface *desc; | |
397 | struct usb_endpoint_descriptor *endpoint; | |
398 | struct lvs_rh *lvs; | |
399 | unsigned int pipe; | |
400 | int ret, maxp; | |
401 | ||
402 | hdev = interface_to_usbdev(intf); | |
403 | desc = intf->cur_altsetting; | |
1dc56c52 | 404 | |
175f88a3 JH |
405 | ret = usb_find_int_in_endpoint(desc, &endpoint); |
406 | if (ret) | |
407 | return ret; | |
ce21bfe6 PA |
408 | |
409 | /* valid only for SS root hub */ | |
410 | if (hdev->descriptor.bDeviceProtocol != USB_HUB_PR_SS || hdev->parent) { | |
411 | dev_err(&intf->dev, "Bind LVS driver with SS root Hub only\n"); | |
412 | return -EINVAL; | |
413 | } | |
414 | ||
415 | lvs = devm_kzalloc(&intf->dev, sizeof(*lvs), GFP_KERNEL); | |
416 | if (!lvs) | |
417 | return -ENOMEM; | |
418 | ||
419 | lvs->intf = intf; | |
420 | usb_set_intfdata(intf, lvs); | |
421 | ||
422 | /* how many number of ports this root hub has */ | |
423 | ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), | |
424 | USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, | |
425 | USB_DT_SS_HUB << 8, 0, &lvs->descriptor, | |
426 | USB_DT_SS_HUB_SIZE, USB_CTRL_GET_TIMEOUT); | |
427 | if (ret < (USB_DT_HUB_NONVAR_SIZE + 2)) { | |
428 | dev_err(&hdev->dev, "wrong root hub descriptor read %d\n", ret); | |
53141249 | 429 | return ret < 0 ? ret : -EINVAL; |
ce21bfe6 PA |
430 | } |
431 | ||
432 | /* submit urb to poll interrupt endpoint */ | |
433 | lvs->urb = usb_alloc_urb(0, GFP_KERNEL); | |
da4e20ff | 434 | if (!lvs->urb) |
ce21bfe6 | 435 | return -ENOMEM; |
ce21bfe6 | 436 | |
ce21bfe6 PA |
437 | INIT_WORK(&lvs->rh_work, lvs_rh_work); |
438 | ||
ce21bfe6 PA |
439 | pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
440 | maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); | |
441 | usb_fill_int_urb(lvs->urb, hdev, pipe, &lvs->buffer[0], maxp, | |
442 | lvs_rh_irq, lvs, endpoint->bInterval); | |
443 | ||
444 | ret = usb_submit_urb(lvs->urb, GFP_KERNEL); | |
445 | if (ret < 0) { | |
446 | dev_err(&intf->dev, "couldn't submit lvs urb %d\n", ret); | |
899ad6d6 | 447 | goto free_urb; |
ce21bfe6 PA |
448 | } |
449 | ||
450 | return ret; | |
451 | ||
ce21bfe6 PA |
452 | free_urb: |
453 | usb_free_urb(lvs->urb); | |
454 | return ret; | |
455 | } | |
456 | ||
457 | static void lvs_rh_disconnect(struct usb_interface *intf) | |
458 | { | |
459 | struct lvs_rh *lvs = usb_get_intfdata(intf); | |
460 | ||
c4ba329c | 461 | usb_poison_urb(lvs->urb); /* used in scheduled work */ |
bd783108 | 462 | flush_work(&lvs->rh_work); |
ce21bfe6 PA |
463 | usb_free_urb(lvs->urb); |
464 | } | |
465 | ||
466 | static struct usb_driver lvs_driver = { | |
467 | .name = "lvs", | |
468 | .probe = lvs_rh_probe, | |
469 | .disconnect = lvs_rh_disconnect, | |
899ad6d6 | 470 | .dev_groups = lvs_groups, |
ce21bfe6 PA |
471 | }; |
472 | ||
473 | module_usb_driver(lvs_driver); | |
474 | ||
475 | MODULE_DESCRIPTION("Link Layer Validation System Driver"); | |
476 | MODULE_LICENSE("GPL"); |