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c82ee6d3 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
f2ed287b LR |
2 | /* |
3 | * SCR24x PCMCIA Smart Card Reader Driver | |
4 | * | |
5 | * Copyright (C) 2005-2006 TL Sudheendran | |
6 | * Copyright (C) 2016 Lubomir Rintel | |
7 | * | |
8 | * Derived from "scr24x_v4.2.6_Release.tar.gz" driver by TL Sudheendran. | |
f2ed287b LR |
9 | */ |
10 | ||
11 | #include <linux/device.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/delay.h> | |
14 | #include <linux/cdev.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/fs.h> | |
ee76bba7 | 17 | #include <linux/io.h> |
f2ed287b LR |
18 | #include <linux/uaccess.h> |
19 | ||
20 | #include <pcmcia/cistpl.h> | |
21 | #include <pcmcia/ds.h> | |
22 | ||
23 | #define CCID_HEADER_SIZE 10 | |
24 | #define CCID_LENGTH_OFFSET 1 | |
25 | #define CCID_MAX_LEN 271 | |
26 | ||
27 | #define SCR24X_DATA(n) (1 + n) | |
28 | #define SCR24X_CMD_STATUS 7 | |
29 | #define CMD_START 0x40 | |
30 | #define CMD_WRITE_BYTE 0x41 | |
31 | #define CMD_READ_BYTE 0x42 | |
32 | #define STATUS_BUSY 0x80 | |
33 | ||
34 | struct scr24x_dev { | |
35 | struct device *dev; | |
36 | struct cdev c_dev; | |
37 | unsigned char buf[CCID_MAX_LEN]; | |
38 | int devno; | |
39 | struct mutex lock; | |
40 | struct kref refcnt; | |
41 | u8 __iomem *regs; | |
42 | }; | |
43 | ||
44 | #define SCR24X_DEVS 8 | |
45 | static DECLARE_BITMAP(scr24x_minors, SCR24X_DEVS); | |
46 | ||
47 | static struct class *scr24x_class; | |
48 | static dev_t scr24x_devt; | |
49 | ||
50 | static void scr24x_delete(struct kref *kref) | |
51 | { | |
52 | struct scr24x_dev *dev = container_of(kref, struct scr24x_dev, | |
53 | refcnt); | |
54 | ||
55 | kfree(dev); | |
56 | } | |
57 | ||
58 | static int scr24x_wait_ready(struct scr24x_dev *dev) | |
59 | { | |
60 | u_char status; | |
61 | int timeout = 100; | |
62 | ||
63 | do { | |
64 | status = ioread8(dev->regs + SCR24X_CMD_STATUS); | |
65 | if (!(status & STATUS_BUSY)) | |
66 | return 0; | |
67 | ||
68 | msleep(20); | |
69 | } while (--timeout); | |
70 | ||
71 | return -EIO; | |
72 | } | |
73 | ||
74 | static int scr24x_open(struct inode *inode, struct file *filp) | |
75 | { | |
76 | struct scr24x_dev *dev = container_of(inode->i_cdev, | |
77 | struct scr24x_dev, c_dev); | |
78 | ||
79 | kref_get(&dev->refcnt); | |
80 | filp->private_data = dev; | |
81 | ||
c5bf68fe | 82 | return stream_open(inode, filp); |
f2ed287b LR |
83 | } |
84 | ||
85 | static int scr24x_release(struct inode *inode, struct file *filp) | |
86 | { | |
87 | struct scr24x_dev *dev = filp->private_data; | |
88 | ||
89 | /* We must not take the dev->lock here as scr24x_delete() | |
90 | * might be called to remove the dev structure altogether. | |
91 | * We don't need the lock anyway, since after the reference | |
92 | * acquired in probe() is released in remove() the chrdev | |
93 | * is already unregistered and noone can possibly acquire | |
94 | * a reference via open() anymore. */ | |
95 | kref_put(&dev->refcnt, scr24x_delete); | |
96 | return 0; | |
97 | } | |
98 | ||
99 | static int read_chunk(struct scr24x_dev *dev, size_t offset, size_t limit) | |
100 | { | |
101 | size_t i, y; | |
102 | int ret; | |
103 | ||
104 | for (i = offset; i < limit; i += 5) { | |
105 | iowrite8(CMD_READ_BYTE, dev->regs + SCR24X_CMD_STATUS); | |
106 | ret = scr24x_wait_ready(dev); | |
107 | if (ret < 0) | |
108 | return ret; | |
109 | ||
110 | for (y = 0; y < 5 && i + y < limit; y++) | |
111 | dev->buf[i + y] = ioread8(dev->regs + SCR24X_DATA(y)); | |
112 | } | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | static ssize_t scr24x_read(struct file *filp, char __user *buf, size_t count, | |
118 | loff_t *ppos) | |
119 | { | |
120 | struct scr24x_dev *dev = filp->private_data; | |
121 | int ret; | |
122 | int len; | |
123 | ||
124 | if (count < CCID_HEADER_SIZE) | |
125 | return -EINVAL; | |
126 | ||
127 | if (mutex_lock_interruptible(&dev->lock)) | |
128 | return -ERESTARTSYS; | |
129 | ||
130 | if (!dev->dev) { | |
131 | ret = -ENODEV; | |
132 | goto out; | |
133 | } | |
134 | ||
135 | ret = scr24x_wait_ready(dev); | |
136 | if (ret < 0) | |
137 | goto out; | |
138 | len = CCID_HEADER_SIZE; | |
139 | ret = read_chunk(dev, 0, len); | |
140 | if (ret < 0) | |
141 | goto out; | |
142 | ||
143 | len += le32_to_cpu(*(__le32 *)(&dev->buf[CCID_LENGTH_OFFSET])); | |
144 | if (len > sizeof(dev->buf)) { | |
145 | ret = -EIO; | |
146 | goto out; | |
147 | } | |
999e4bf1 | 148 | ret = read_chunk(dev, CCID_HEADER_SIZE, len); |
f2ed287b LR |
149 | if (ret < 0) |
150 | goto out; | |
151 | ||
152 | if (len < count) | |
153 | count = len; | |
154 | ||
155 | if (copy_to_user(buf, dev->buf, count)) { | |
156 | ret = -EFAULT; | |
157 | goto out; | |
158 | } | |
159 | ||
160 | ret = count; | |
161 | out: | |
162 | mutex_unlock(&dev->lock); | |
163 | return ret; | |
164 | } | |
165 | ||
166 | static ssize_t scr24x_write(struct file *filp, const char __user *buf, | |
167 | size_t count, loff_t *ppos) | |
168 | { | |
169 | struct scr24x_dev *dev = filp->private_data; | |
170 | size_t i, y; | |
171 | int ret; | |
172 | ||
173 | if (mutex_lock_interruptible(&dev->lock)) | |
174 | return -ERESTARTSYS; | |
175 | ||
176 | if (!dev->dev) { | |
177 | ret = -ENODEV; | |
178 | goto out; | |
179 | } | |
180 | ||
181 | if (count > sizeof(dev->buf)) { | |
182 | ret = -EINVAL; | |
183 | goto out; | |
184 | } | |
185 | ||
186 | if (copy_from_user(dev->buf, buf, count)) { | |
187 | ret = -EFAULT; | |
188 | goto out; | |
189 | } | |
190 | ||
191 | ret = scr24x_wait_ready(dev); | |
192 | if (ret < 0) | |
193 | goto out; | |
194 | ||
195 | iowrite8(CMD_START, dev->regs + SCR24X_CMD_STATUS); | |
196 | ret = scr24x_wait_ready(dev); | |
197 | if (ret < 0) | |
198 | goto out; | |
199 | ||
200 | for (i = 0; i < count; i += 5) { | |
201 | for (y = 0; y < 5 && i + y < count; y++) | |
202 | iowrite8(dev->buf[i + y], dev->regs + SCR24X_DATA(y)); | |
203 | ||
204 | iowrite8(CMD_WRITE_BYTE, dev->regs + SCR24X_CMD_STATUS); | |
205 | ret = scr24x_wait_ready(dev); | |
206 | if (ret < 0) | |
207 | goto out; | |
208 | } | |
209 | ||
210 | ret = count; | |
211 | out: | |
212 | mutex_unlock(&dev->lock); | |
213 | return ret; | |
214 | } | |
215 | ||
216 | static const struct file_operations scr24x_fops = { | |
217 | .owner = THIS_MODULE, | |
218 | .read = scr24x_read, | |
219 | .write = scr24x_write, | |
220 | .open = scr24x_open, | |
221 | .release = scr24x_release, | |
222 | .llseek = no_llseek, | |
223 | }; | |
224 | ||
225 | static int scr24x_config_check(struct pcmcia_device *link, void *priv_data) | |
226 | { | |
227 | if (resource_size(link->resource[PCMCIA_IOPORT_0]) != 0x11) | |
228 | return -ENODEV; | |
229 | return pcmcia_request_io(link); | |
230 | } | |
231 | ||
232 | static int scr24x_probe(struct pcmcia_device *link) | |
233 | { | |
234 | struct scr24x_dev *dev; | |
235 | int ret; | |
236 | ||
237 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
238 | if (!dev) | |
239 | return -ENOMEM; | |
240 | ||
241 | dev->devno = find_first_zero_bit(scr24x_minors, SCR24X_DEVS); | |
242 | if (dev->devno >= SCR24X_DEVS) { | |
243 | ret = -EBUSY; | |
244 | goto err; | |
245 | } | |
246 | ||
247 | mutex_init(&dev->lock); | |
248 | kref_init(&dev->refcnt); | |
249 | ||
250 | link->priv = dev; | |
251 | link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO; | |
252 | ||
253 | ret = pcmcia_loop_config(link, scr24x_config_check, NULL); | |
254 | if (ret < 0) | |
255 | goto err; | |
256 | ||
257 | dev->dev = &link->dev; | |
258 | dev->regs = devm_ioport_map(&link->dev, | |
259 | link->resource[PCMCIA_IOPORT_0]->start, | |
260 | resource_size(link->resource[PCMCIA_IOPORT_0])); | |
261 | if (!dev->regs) { | |
262 | ret = -EIO; | |
263 | goto err; | |
264 | } | |
265 | ||
266 | cdev_init(&dev->c_dev, &scr24x_fops); | |
267 | dev->c_dev.owner = THIS_MODULE; | |
f2ed287b LR |
268 | ret = cdev_add(&dev->c_dev, MKDEV(MAJOR(scr24x_devt), dev->devno), 1); |
269 | if (ret < 0) | |
270 | goto err; | |
271 | ||
272 | ret = pcmcia_enable_device(link); | |
273 | if (ret < 0) { | |
274 | pcmcia_disable_device(link); | |
275 | goto err; | |
276 | } | |
277 | ||
278 | device_create(scr24x_class, NULL, MKDEV(MAJOR(scr24x_devt), dev->devno), | |
279 | NULL, "scr24x%d", dev->devno); | |
280 | ||
281 | dev_info(&link->dev, "SCR24x Chip Card Interface\n"); | |
282 | return 0; | |
283 | ||
284 | err: | |
285 | if (dev->devno < SCR24X_DEVS) | |
286 | clear_bit(dev->devno, scr24x_minors); | |
287 | kfree (dev); | |
288 | return ret; | |
289 | } | |
290 | ||
291 | static void scr24x_remove(struct pcmcia_device *link) | |
292 | { | |
293 | struct scr24x_dev *dev = (struct scr24x_dev *)link->priv; | |
294 | ||
295 | device_destroy(scr24x_class, MKDEV(MAJOR(scr24x_devt), dev->devno)); | |
296 | mutex_lock(&dev->lock); | |
297 | pcmcia_disable_device(link); | |
298 | cdev_del(&dev->c_dev); | |
299 | clear_bit(dev->devno, scr24x_minors); | |
300 | dev->dev = NULL; | |
301 | mutex_unlock(&dev->lock); | |
302 | ||
303 | kref_put(&dev->refcnt, scr24x_delete); | |
304 | } | |
305 | ||
306 | static const struct pcmcia_device_id scr24x_ids[] = { | |
307 | PCMCIA_DEVICE_PROD_ID12("HP", "PC Card Smart Card Reader", | |
308 | 0x53cb94f9, 0xbfdf89a5), | |
309 | PCMCIA_DEVICE_PROD_ID1("SCR241 PCMCIA", 0x6271efa3), | |
310 | PCMCIA_DEVICE_PROD_ID1("SCR243 PCMCIA", 0x2054e8de), | |
311 | PCMCIA_DEVICE_PROD_ID1("SCR24x PCMCIA", 0x54a33665), | |
312 | PCMCIA_DEVICE_NULL | |
313 | }; | |
314 | MODULE_DEVICE_TABLE(pcmcia, scr24x_ids); | |
315 | ||
316 | static struct pcmcia_driver scr24x_driver = { | |
317 | .owner = THIS_MODULE, | |
318 | .name = "scr24x_cs", | |
319 | .probe = scr24x_probe, | |
320 | .remove = scr24x_remove, | |
321 | .id_table = scr24x_ids, | |
322 | }; | |
323 | ||
324 | static int __init scr24x_init(void) | |
325 | { | |
326 | int ret; | |
327 | ||
1aaba11d | 328 | scr24x_class = class_create("scr24x"); |
f2ed287b LR |
329 | if (IS_ERR(scr24x_class)) |
330 | return PTR_ERR(scr24x_class); | |
331 | ||
332 | ret = alloc_chrdev_region(&scr24x_devt, 0, SCR24X_DEVS, "scr24x"); | |
333 | if (ret < 0) { | |
334 | class_destroy(scr24x_class); | |
335 | return ret; | |
336 | } | |
337 | ||
338 | ret = pcmcia_register_driver(&scr24x_driver); | |
339 | if (ret < 0) { | |
340 | unregister_chrdev_region(scr24x_devt, SCR24X_DEVS); | |
341 | class_destroy(scr24x_class); | |
342 | } | |
343 | ||
344 | return ret; | |
345 | } | |
346 | ||
347 | static void __exit scr24x_exit(void) | |
348 | { | |
349 | pcmcia_unregister_driver(&scr24x_driver); | |
350 | unregister_chrdev_region(scr24x_devt, SCR24X_DEVS); | |
351 | class_destroy(scr24x_class); | |
352 | } | |
353 | ||
354 | module_init(scr24x_init); | |
355 | module_exit(scr24x_exit); | |
356 | ||
357 | MODULE_AUTHOR("Lubomir Rintel"); | |
358 | MODULE_DESCRIPTION("SCR24x PCMCIA Smart Card Reader Driver"); | |
359 | MODULE_LICENSE("GPL"); |