Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/drivers/char/tb0219.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 7214 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | /* |
2 | * Driver for TANBAC TB0219 base board. |
3 | * |
4 | * Copyright (C) 2005 Yoichi Yuasa <yuasa@hh.iij4u.or.jp> |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License as published by |
8 | * the Free Software Foundation; either version 2 of the License, or |
9 | * (at your option) any later version. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, write to the Free Software |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | */ |
20 | #include <linux/device.h> |
21 | #include <linux/fs.h> |
22 | #include <linux/init.h> |
23 | #include <linux/module.h> |
24 | |
25 | #include <asm/io.h> |
26 | #include <asm/reboot.h> |
27 | |
28 | MODULE_AUTHOR("Yoichi Yuasa <yuasa@hh.iij4u.or.jp>"); |
29 | MODULE_DESCRIPTION("TANBAC TB0219 base board driver"); |
30 | MODULE_LICENSE("GPL"); |
31 | |
32 | static int major; /* default is dynamic major device number */ |
33 | module_param(major, int, 0); |
34 | MODULE_PARM_DESC(major, "Major device number"); |
35 | |
36 | static void (*old_machine_restart)(char *command); |
37 | static void __iomem *tb0219_base; |
38 | static spinlock_t tb0219_lock; |
39 | |
40 | #define tb0219_read(offset) readw(tb0219_base + (offset)) |
41 | #define tb0219_write(offset, value) writew((value), tb0219_base + (offset)) |
42 | |
43 | #define TB0219_START 0x0a000000UL |
44 | #define TB0219_SIZE 0x20UL |
45 | |
46 | #define TB0219_LED 0x00 |
47 | #define TB0219_GPIO_INPUT 0x02 |
48 | #define TB0219_GPIO_OUTPUT 0x04 |
49 | #define TB0219_DIP_SWITCH 0x06 |
50 | #define TB0219_MISC 0x08 |
51 | #define TB0219_RESET 0x0e |
52 | #define TB0219_PCI_SLOT1_IRQ_STATUS 0x10 |
53 | #define TB0219_PCI_SLOT2_IRQ_STATUS 0x12 |
54 | #define TB0219_PCI_SLOT3_IRQ_STATUS 0x14 |
55 | |
56 | typedef enum { |
57 | TYPE_LED, |
58 | TYPE_GPIO_OUTPUT, |
59 | } tb0219_type_t; |
60 | |
61 | /* |
62 | * Minor device number |
63 | * 0 = 7 segment LED |
64 | * |
65 | * 16 = GPIO IN 0 |
66 | * 17 = GPIO IN 1 |
67 | * 18 = GPIO IN 2 |
68 | * 19 = GPIO IN 3 |
69 | * 20 = GPIO IN 4 |
70 | * 21 = GPIO IN 5 |
71 | * 22 = GPIO IN 6 |
72 | * 23 = GPIO IN 7 |
73 | * |
74 | * 32 = GPIO OUT 0 |
75 | * 33 = GPIO OUT 1 |
76 | * 34 = GPIO OUT 2 |
77 | * 35 = GPIO OUT 3 |
78 | * 36 = GPIO OUT 4 |
79 | * 37 = GPIO OUT 5 |
80 | * 38 = GPIO OUT 6 |
81 | * 39 = GPIO OUT 7 |
82 | * |
83 | * 48 = DIP switch 1 |
84 | * 49 = DIP switch 2 |
85 | * 50 = DIP switch 3 |
86 | * 51 = DIP switch 4 |
87 | * 52 = DIP switch 5 |
88 | * 53 = DIP switch 6 |
89 | * 54 = DIP switch 7 |
90 | * 55 = DIP switch 8 |
91 | */ |
92 | |
93 | static inline char get_led(void) |
94 | { |
95 | return (char)tb0219_read(TB0219_LED); |
96 | } |
97 | |
98 | static inline char get_gpio_input_pin(unsigned int pin) |
99 | { |
100 | uint16_t values; |
101 | |
102 | values = tb0219_read(TB0219_GPIO_INPUT); |
103 | if (values & (1 << pin)) |
104 | return '1'; |
105 | |
106 | return '0'; |
107 | } |
108 | |
109 | static inline char get_gpio_output_pin(unsigned int pin) |
110 | { |
111 | uint16_t values; |
112 | |
113 | values = tb0219_read(TB0219_GPIO_OUTPUT); |
114 | if (values & (1 << pin)) |
115 | return '1'; |
116 | |
117 | return '0'; |
118 | } |
119 | |
120 | static inline char get_dip_switch(unsigned int pin) |
121 | { |
122 | uint16_t values; |
123 | |
124 | values = tb0219_read(TB0219_DIP_SWITCH); |
125 | if (values & (1 << pin)) |
126 | return '1'; |
127 | |
128 | return '0'; |
129 | } |
130 | |
131 | static inline int set_led(char command) |
132 | { |
133 | tb0219_write(TB0219_LED, command); |
134 | |
135 | return 0; |
136 | } |
137 | |
138 | static inline int set_gpio_output_pin(unsigned int pin, char command) |
139 | { |
140 | unsigned long flags; |
141 | uint16_t value; |
142 | |
143 | if (command != '0' && command != '1') |
144 | return -EINVAL; |
145 | |
146 | spin_lock_irqsave(&tb0219_lock, flags); |
147 | value = tb0219_read(TB0219_GPIO_OUTPUT); |
148 | if (command == '0') |
149 | value &= ~(1 << pin); |
150 | else |
151 | value |= 1 << pin; |
152 | tb0219_write(TB0219_GPIO_OUTPUT, value); |
153 | spin_unlock_irqrestore(&tb0219_lock, flags); |
154 | |
155 | return 0; |
156 | |
157 | } |
158 | |
159 | static ssize_t tanbac_tb0219_read(struct file *file, char __user *buf, size_t len, |
160 | loff_t *ppos) |
161 | { |
162 | unsigned int minor; |
163 | char value; |
164 | |
165 | minor = iminor(file->f_dentry->d_inode); |
166 | switch (minor) { |
167 | case 0: |
168 | value = get_led(); |
169 | break; |
170 | case 16 ... 23: |
171 | value = get_gpio_input_pin(minor - 16); |
172 | break; |
173 | case 32 ... 39: |
174 | value = get_gpio_output_pin(minor - 32); |
175 | break; |
176 | case 48 ... 55: |
177 | value = get_dip_switch(minor - 48); |
178 | break; |
179 | default: |
180 | return -EBADF; |
181 | } |
182 | |
183 | if (len <= 0) |
184 | return -EFAULT; |
185 | |
186 | if (put_user(value, buf)) |
187 | return -EFAULT; |
188 | |
189 | return 1; |
190 | } |
191 | |
192 | static ssize_t tanbac_tb0219_write(struct file *file, const char __user *data, |
193 | size_t len, loff_t *ppos) |
194 | { |
195 | unsigned int minor; |
196 | tb0219_type_t type; |
197 | size_t i; |
198 | int retval = 0; |
199 | char c; |
200 | |
201 | minor = iminor(file->f_dentry->d_inode); |
202 | switch (minor) { |
203 | case 0: |
204 | type = TYPE_LED; |
205 | break; |
206 | case 32 ... 39: |
207 | type = TYPE_GPIO_OUTPUT; |
208 | break; |
209 | default: |
210 | return -EBADF; |
211 | } |
212 | |
213 | for (i = 0; i < len; i++) { |
214 | if (get_user(c, data + i)) |
215 | return -EFAULT; |
216 | |
217 | switch (type) { |
218 | case TYPE_LED: |
219 | retval = set_led(c); |
220 | break; |
221 | case TYPE_GPIO_OUTPUT: |
222 | retval = set_gpio_output_pin(minor - 32, c); |
223 | break; |
224 | } |
225 | |
226 | if (retval < 0) |
227 | break; |
228 | } |
229 | |
230 | return i; |
231 | } |
232 | |
233 | static int tanbac_tb0219_open(struct inode *inode, struct file *file) |
234 | { |
235 | unsigned int minor; |
236 | |
237 | minor = iminor(inode); |
238 | switch (minor) { |
239 | case 0: |
240 | case 16 ... 23: |
241 | case 32 ... 39: |
242 | case 48 ... 55: |
243 | return nonseekable_open(inode, file); |
244 | default: |
245 | break; |
246 | } |
247 | |
248 | return -EBADF; |
249 | } |
250 | |
251 | static int tanbac_tb0219_release(struct inode *inode, struct file *file) |
252 | { |
253 | return 0; |
254 | } |
255 | |
256 | static struct file_operations tb0219_fops = { |
257 | .owner = THIS_MODULE, |
258 | .read = tanbac_tb0219_read, |
259 | .write = tanbac_tb0219_write, |
260 | .open = tanbac_tb0219_open, |
261 | .release = tanbac_tb0219_release, |
262 | }; |
263 | |
264 | static void tb0219_restart(char *command) |
265 | { |
266 | tb0219_write(TB0219_RESET, 0); |
267 | } |
268 | |
269 | static int tb0219_probe(struct device *dev) |
270 | { |
271 | int retval; |
272 | |
273 | if (request_mem_region(TB0219_START, TB0219_SIZE, "TB0219") == NULL) |
274 | return -EBUSY; |
275 | |
276 | tb0219_base = ioremap(TB0219_START, TB0219_SIZE); |
277 | if (tb0219_base == NULL) { |
278 | release_mem_region(TB0219_START, TB0219_SIZE); |
279 | return -ENOMEM; |
280 | } |
281 | |
282 | retval = register_chrdev(major, "TB0219", &tb0219_fops); |
283 | if (retval < 0) { |
284 | iounmap(tb0219_base); |
285 | tb0219_base = NULL; |
286 | release_mem_region(TB0219_START, TB0219_SIZE); |
287 | return retval; |
288 | } |
289 | |
290 | spin_lock_init(&tb0219_lock); |
291 | |
292 | old_machine_restart = _machine_restart; |
293 | _machine_restart = tb0219_restart; |
294 | |
295 | if (major == 0) { |
296 | major = retval; |
297 | printk(KERN_INFO "TB0219: major number %d\n", major); |
298 | } |
299 | |
300 | return 0; |
301 | } |
302 | |
303 | static int tb0219_remove(struct device *dev) |
304 | { |
305 | _machine_restart = old_machine_restart; |
306 | |
307 | iounmap(tb0219_base); |
308 | tb0219_base = NULL; |
309 | |
310 | release_mem_region(TB0219_START, TB0219_SIZE); |
311 | |
312 | return 0; |
313 | } |
314 | |
315 | static struct platform_device *tb0219_platform_device; |
316 | |
317 | static struct device_driver tb0219_device_driver = { |
318 | .name = "TB0219", |
319 | .bus = &platform_bus_type, |
320 | .probe = tb0219_probe, |
321 | .remove = tb0219_remove, |
322 | }; |
323 | |
324 | static int __devinit tanbac_tb0219_init(void) |
325 | { |
326 | int retval; |
327 | |
328 | tb0219_platform_device = platform_device_register_simple("TB0219", -1, NULL, 0); |
329 | if (IS_ERR(tb0219_platform_device)) |
330 | return PTR_ERR(tb0219_platform_device); |
331 | |
332 | retval = driver_register(&tb0219_device_driver); |
333 | if (retval < 0) |
334 | platform_device_unregister(tb0219_platform_device); |
335 | |
336 | return retval; |
337 | } |
338 | |
339 | static void __devexit tanbac_tb0219_exit(void) |
340 | { |
341 | driver_unregister(&tb0219_device_driver); |
342 | |
343 | platform_device_unregister(tb0219_platform_device); |
344 | } |
345 | |
346 | module_init(tanbac_tb0219_init); |
347 | module_exit(tanbac_tb0219_exit); |