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8#include <linux/errno.h>
9#include <linux/init.h>
10#include <linux/module.h>
11#include <linux/kernel.h>
12#include <linux/kmod.h>
13#include <linux/slab.h>
14#include <linux/mm.h>
15#include <linux/string.h>
16#include <linux/types.h>
17
18#include "cec-priv.h"
19
20#define CEC_NUM_DEVICES 256
21#define CEC_NAME "cec"
22
23int cec_debug;
24module_param_named(debug, cec_debug, int, 0644);
25MODULE_PARM_DESC(debug, "debug level (0-2)");
26
27static bool debug_phys_addr;
28module_param(debug_phys_addr, bool, 0644);
29MODULE_PARM_DESC(debug_phys_addr, "add CEC_CAP_PHYS_ADDR if set");
30
31static dev_t cec_dev_t;
32
33
34static DEFINE_MUTEX(cec_devnode_lock);
35static DECLARE_BITMAP(cec_devnode_nums, CEC_NUM_DEVICES);
36
37static struct dentry *top_cec_dir;
38
39
40#define to_cec_devnode(cd) container_of(cd, struct cec_devnode, dev)
41
42int cec_get_device(struct cec_devnode *devnode)
43{
44
45
46
47
48
49
50
51 mutex_lock(&devnode->lock);
52
53
54
55
56 if (!devnode->registered) {
57 mutex_unlock(&devnode->lock);
58 return -ENXIO;
59 }
60
61 get_device(&devnode->dev);
62 mutex_unlock(&devnode->lock);
63 return 0;
64}
65
66void cec_put_device(struct cec_devnode *devnode)
67{
68 put_device(&devnode->dev);
69}
70
71
72static void cec_devnode_release(struct device *cd)
73{
74 struct cec_devnode *devnode = to_cec_devnode(cd);
75
76 mutex_lock(&cec_devnode_lock);
77
78 clear_bit(devnode->minor, cec_devnode_nums);
79 mutex_unlock(&cec_devnode_lock);
80
81 cec_delete_adapter(to_cec_adapter(devnode));
82}
83
84static struct bus_type cec_bus_type = {
85 .name = CEC_NAME,
86};
87
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100
101static int __must_check cec_devnode_register(struct cec_devnode *devnode,
102 struct module *owner)
103{
104 int minor;
105 int ret;
106
107
108 mutex_lock(&cec_devnode_lock);
109 minor = find_next_zero_bit(cec_devnode_nums, CEC_NUM_DEVICES, 0);
110 if (minor == CEC_NUM_DEVICES) {
111 mutex_unlock(&cec_devnode_lock);
112 pr_err("could not get a free minor\n");
113 return -ENFILE;
114 }
115
116 set_bit(minor, cec_devnode_nums);
117 mutex_unlock(&cec_devnode_lock);
118
119 devnode->minor = minor;
120 devnode->dev.bus = &cec_bus_type;
121 devnode->dev.devt = MKDEV(MAJOR(cec_dev_t), minor);
122 devnode->dev.release = cec_devnode_release;
123 dev_set_name(&devnode->dev, "cec%d", devnode->minor);
124 device_initialize(&devnode->dev);
125
126
127 cdev_init(&devnode->cdev, &cec_devnode_fops);
128 devnode->cdev.owner = owner;
129 kobject_set_name(&devnode->cdev.kobj, "cec%d", devnode->minor);
130
131 devnode->registered = true;
132 ret = cdev_device_add(&devnode->cdev, &devnode->dev);
133 if (ret) {
134 devnode->registered = false;
135 pr_err("%s: cdev_device_add failed\n", __func__);
136 goto clr_bit;
137 }
138
139 return 0;
140
141clr_bit:
142 mutex_lock(&cec_devnode_lock);
143 clear_bit(devnode->minor, cec_devnode_nums);
144 mutex_unlock(&cec_devnode_lock);
145 return ret;
146}
147
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151
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154
155
156
157static void cec_devnode_unregister(struct cec_adapter *adap)
158{
159 struct cec_devnode *devnode = &adap->devnode;
160 struct cec_fh *fh;
161
162 mutex_lock(&devnode->lock);
163
164
165 if (!devnode->registered || devnode->unregistered) {
166 mutex_unlock(&devnode->lock);
167 return;
168 }
169
170 list_for_each_entry(fh, &devnode->fhs, list)
171 wake_up_interruptible(&fh->wait);
172
173 devnode->registered = false;
174 devnode->unregistered = true;
175 mutex_unlock(&devnode->lock);
176
177 mutex_lock(&adap->lock);
178 __cec_s_phys_addr(adap, CEC_PHYS_ADDR_INVALID, false);
179 __cec_s_log_addrs(adap, NULL, false);
180 mutex_unlock(&adap->lock);
181
182 cdev_device_del(&devnode->cdev, &devnode->dev);
183 put_device(&devnode->dev);
184}
185
186#ifdef CONFIG_DEBUG_FS
187static ssize_t cec_error_inj_write(struct file *file,
188 const char __user *ubuf, size_t count, loff_t *ppos)
189{
190 struct seq_file *sf = file->private_data;
191 struct cec_adapter *adap = sf->private;
192 char *buf;
193 char *line;
194 char *p;
195
196 buf = memdup_user_nul(ubuf, min_t(size_t, PAGE_SIZE, count));
197 if (IS_ERR(buf))
198 return PTR_ERR(buf);
199 p = buf;
200 while (p && *p) {
201 p = skip_spaces(p);
202 line = strsep(&p, "\n");
203 if (!*line || *line == '#')
204 continue;
205 if (!adap->ops->error_inj_parse_line(adap, line)) {
206 kfree(buf);
207 return -EINVAL;
208 }
209 }
210 kfree(buf);
211 return count;
212}
213
214static int cec_error_inj_show(struct seq_file *sf, void *unused)
215{
216 struct cec_adapter *adap = sf->private;
217
218 return adap->ops->error_inj_show(adap, sf);
219}
220
221static int cec_error_inj_open(struct inode *inode, struct file *file)
222{
223 return single_open(file, cec_error_inj_show, inode->i_private);
224}
225
226static const struct file_operations cec_error_inj_fops = {
227 .open = cec_error_inj_open,
228 .write = cec_error_inj_write,
229 .read = seq_read,
230 .llseek = seq_lseek,
231 .release = single_release,
232};
233#endif
234
235struct cec_adapter *cec_allocate_adapter(const struct cec_adap_ops *ops,
236 void *priv, const char *name, u32 caps,
237 u8 available_las)
238{
239 struct cec_adapter *adap;
240 int res;
241
242#ifndef CONFIG_MEDIA_CEC_RC
243 caps &= ~CEC_CAP_RC;
244#endif
245
246 if (WARN_ON(!caps))
247 return ERR_PTR(-EINVAL);
248 if (WARN_ON(!ops))
249 return ERR_PTR(-EINVAL);
250 if (WARN_ON(!available_las || available_las > CEC_MAX_LOG_ADDRS))
251 return ERR_PTR(-EINVAL);
252 adap = kzalloc(sizeof(*adap), GFP_KERNEL);
253 if (!adap)
254 return ERR_PTR(-ENOMEM);
255 strscpy(adap->name, name, sizeof(adap->name));
256 adap->phys_addr = CEC_PHYS_ADDR_INVALID;
257 adap->cec_pin_is_high = true;
258 adap->log_addrs.cec_version = CEC_OP_CEC_VERSION_2_0;
259 adap->log_addrs.vendor_id = CEC_VENDOR_ID_NONE;
260 adap->capabilities = caps;
261 if (debug_phys_addr)
262 adap->capabilities |= CEC_CAP_PHYS_ADDR;
263 adap->needs_hpd = caps & CEC_CAP_NEEDS_HPD;
264 adap->available_log_addrs = available_las;
265 adap->sequence = 0;
266 adap->ops = ops;
267 adap->priv = priv;
268 memset(adap->phys_addrs, 0xff, sizeof(adap->phys_addrs));
269 mutex_init(&adap->lock);
270 INIT_LIST_HEAD(&adap->transmit_queue);
271 INIT_LIST_HEAD(&adap->wait_queue);
272 init_waitqueue_head(&adap->kthread_waitq);
273
274
275 INIT_LIST_HEAD(&adap->devnode.fhs);
276 mutex_init(&adap->devnode.lock);
277
278 adap->kthread = kthread_run(cec_thread_func, adap, "cec-%s", name);
279 if (IS_ERR(adap->kthread)) {
280 pr_err("cec-%s: kernel_thread() failed\n", name);
281 res = PTR_ERR(adap->kthread);
282 kfree(adap);
283 return ERR_PTR(res);
284 }
285
286#ifdef CONFIG_MEDIA_CEC_RC
287 if (!(caps & CEC_CAP_RC))
288 return adap;
289
290
291 adap->rc = rc_allocate_device(RC_DRIVER_SCANCODE);
292 if (!adap->rc) {
293 pr_err("cec-%s: failed to allocate memory for rc_dev\n",
294 name);
295 kthread_stop(adap->kthread);
296 kfree(adap);
297 return ERR_PTR(-ENOMEM);
298 }
299
300 snprintf(adap->input_phys, sizeof(adap->input_phys),
301 "%s/input0", adap->name);
302
303 adap->rc->device_name = adap->name;
304 adap->rc->input_phys = adap->input_phys;
305 adap->rc->input_id.bustype = BUS_CEC;
306 adap->rc->input_id.vendor = 0;
307 adap->rc->input_id.product = 0;
308 adap->rc->input_id.version = 1;
309 adap->rc->driver_name = CEC_NAME;
310 adap->rc->allowed_protocols = RC_PROTO_BIT_CEC;
311 adap->rc->priv = adap;
312 adap->rc->map_name = RC_MAP_CEC;
313 adap->rc->timeout = MS_TO_NS(550);
314#endif
315 return adap;
316}
317EXPORT_SYMBOL_GPL(cec_allocate_adapter);
318
319int cec_register_adapter(struct cec_adapter *adap,
320 struct device *parent)
321{
322 int res;
323
324 if (IS_ERR_OR_NULL(adap))
325 return 0;
326
327 if (WARN_ON(!parent))
328 return -EINVAL;
329
330 adap->owner = parent->driver->owner;
331 adap->devnode.dev.parent = parent;
332
333#ifdef CONFIG_MEDIA_CEC_RC
334 if (adap->capabilities & CEC_CAP_RC) {
335 adap->rc->dev.parent = parent;
336 res = rc_register_device(adap->rc);
337
338 if (res) {
339 pr_err("cec-%s: failed to prepare input device\n",
340 adap->name);
341 rc_free_device(adap->rc);
342 adap->rc = NULL;
343 return res;
344 }
345 }
346#endif
347
348 res = cec_devnode_register(&adap->devnode, adap->owner);
349 if (res) {
350#ifdef CONFIG_MEDIA_CEC_RC
351
352 rc_unregister_device(adap->rc);
353 adap->rc = NULL;
354#endif
355 return res;
356 }
357
358 dev_set_drvdata(&adap->devnode.dev, adap);
359#ifdef CONFIG_DEBUG_FS
360 if (!top_cec_dir)
361 return 0;
362
363 adap->cec_dir = debugfs_create_dir(dev_name(&adap->devnode.dev), top_cec_dir);
364 if (IS_ERR_OR_NULL(adap->cec_dir)) {
365 pr_warn("cec-%s: Failed to create debugfs dir\n", adap->name);
366 return 0;
367 }
368 adap->status_file = debugfs_create_devm_seqfile(&adap->devnode.dev,
369 "status", adap->cec_dir, cec_adap_status);
370 if (IS_ERR_OR_NULL(adap->status_file)) {
371 pr_warn("cec-%s: Failed to create status file\n", adap->name);
372 debugfs_remove_recursive(adap->cec_dir);
373 adap->cec_dir = NULL;
374 return 0;
375 }
376 if (!adap->ops->error_inj_show || !adap->ops->error_inj_parse_line)
377 return 0;
378 adap->error_inj_file = debugfs_create_file("error-inj", 0644,
379 adap->cec_dir, adap,
380 &cec_error_inj_fops);
381 if (IS_ERR_OR_NULL(adap->error_inj_file))
382 pr_warn("cec-%s: Failed to create error-inj file\n",
383 adap->name);
384#endif
385 return 0;
386}
387EXPORT_SYMBOL_GPL(cec_register_adapter);
388
389void cec_unregister_adapter(struct cec_adapter *adap)
390{
391 if (IS_ERR_OR_NULL(adap))
392 return;
393
394#ifdef CONFIG_MEDIA_CEC_RC
395
396 rc_unregister_device(adap->rc);
397 adap->rc = NULL;
398#endif
399 debugfs_remove_recursive(adap->cec_dir);
400#ifdef CONFIG_CEC_NOTIFIER
401 cec_notifier_cec_adap_unregister(adap->notifier, adap);
402#endif
403 cec_devnode_unregister(adap);
404}
405EXPORT_SYMBOL_GPL(cec_unregister_adapter);
406
407void cec_delete_adapter(struct cec_adapter *adap)
408{
409 if (IS_ERR_OR_NULL(adap))
410 return;
411 kthread_stop(adap->kthread);
412 if (adap->kthread_config)
413 kthread_stop(adap->kthread_config);
414 if (adap->ops->adap_free)
415 adap->ops->adap_free(adap);
416#ifdef CONFIG_MEDIA_CEC_RC
417 rc_free_device(adap->rc);
418#endif
419 kfree(adap);
420}
421EXPORT_SYMBOL_GPL(cec_delete_adapter);
422
423
424
425
426static int __init cec_devnode_init(void)
427{
428 int ret = alloc_chrdev_region(&cec_dev_t, 0, CEC_NUM_DEVICES, CEC_NAME);
429
430 if (ret < 0) {
431 pr_warn("cec: unable to allocate major\n");
432 return ret;
433 }
434
435#ifdef CONFIG_DEBUG_FS
436 top_cec_dir = debugfs_create_dir("cec", NULL);
437 if (IS_ERR_OR_NULL(top_cec_dir)) {
438 pr_warn("cec: Failed to create debugfs cec dir\n");
439 top_cec_dir = NULL;
440 }
441#endif
442
443 ret = bus_register(&cec_bus_type);
444 if (ret < 0) {
445 unregister_chrdev_region(cec_dev_t, CEC_NUM_DEVICES);
446 pr_warn("cec: bus_register failed\n");
447 return -EIO;
448 }
449
450 return 0;
451}
452
453static void __exit cec_devnode_exit(void)
454{
455 debugfs_remove_recursive(top_cec_dir);
456 bus_unregister(&cec_bus_type);
457 unregister_chrdev_region(cec_dev_t, CEC_NUM_DEVICES);
458}
459
460subsys_initcall(cec_devnode_init);
461module_exit(cec_devnode_exit)
462
463MODULE_AUTHOR("Hans Verkuil <hans.verkuil@cisco.com>");
464MODULE_DESCRIPTION("Device node registration for cec drivers");
465MODULE_LICENSE("GPL");
466
