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455fbdd3 PM |
1 | /* |
2 | * lis3lv02d.c - ST LIS3LV02DL accelerometer driver | |
3 | * | |
4 | * Copyright (C) 2007-2008 Yan Burman | |
5 | * Copyright (C) 2008 Eric Piel | |
ef2cfc79 | 6 | * Copyright (C) 2008-2009 Pavel Machek |
455fbdd3 PM |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | ||
23 | #include <linux/kernel.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/dmi.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/platform_device.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/input.h> | |
31 | #include <linux/kthread.h> | |
32 | #include <linux/semaphore.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/wait.h> | |
35 | #include <linux/poll.h> | |
36 | #include <linux/freezer.h> | |
455fbdd3 | 37 | #include <linux/uaccess.h> |
ef2cfc79 | 38 | #include <linux/miscdevice.h> |
455fbdd3 PM |
39 | #include <acpi/acpi_drivers.h> |
40 | #include <asm/atomic.h> | |
41 | #include "lis3lv02d.h" | |
42 | ||
43 | #define DRIVER_NAME "lis3lv02d" | |
455fbdd3 PM |
44 | |
45 | /* joystick device poll interval in milliseconds */ | |
46 | #define MDPS_POLL_INTERVAL 50 | |
47 | /* | |
48 | * The sensor can also generate interrupts (DRDY) but it's pretty pointless | |
49 | * because their are generated even if the data do not change. So it's better | |
50 | * to keep the interrupt for the free-fall event. The values are updated at | |
51 | * 40Hz (at the lowest frequency), but as it can be pretty time consuming on | |
52 | * some low processor, we poll the sensor only at 20Hz... enough for the | |
53 | * joystick. | |
54 | */ | |
55 | ||
be84cfc5 PM |
56 | struct acpi_lis3lv02d lis3_dev = { |
57 | .misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait), | |
ef2cfc79 PM |
58 | }; |
59 | ||
be84cfc5 | 60 | EXPORT_SYMBOL_GPL(lis3_dev); |
455fbdd3 | 61 | |
be84cfc5 PM |
62 | static s16 lis3lv02d_read_16(acpi_handle handle, int reg) |
63 | { | |
64 | u8 lo, hi; | |
65 | ||
66 | lis3_dev.read(handle, reg, &lo); | |
67 | lis3_dev.read(handle, reg + 1, &hi); | |
68 | /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */ | |
69 | return (s16)((hi << 8) | lo); | |
70 | } | |
71 | ||
455fbdd3 PM |
72 | /** |
73 | * lis3lv02d_get_axis - For the given axis, give the value converted | |
74 | * @axis: 1,2,3 - can also be negative | |
75 | * @hw_values: raw values returned by the hardware | |
76 | * | |
77 | * Returns the converted value. | |
78 | */ | |
79 | static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3]) | |
80 | { | |
81 | if (axis > 0) | |
82 | return hw_values[axis - 1]; | |
83 | else | |
84 | return -hw_values[-axis - 1]; | |
85 | } | |
86 | ||
87 | /** | |
88 | * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer | |
89 | * @handle: the handle to the device | |
90 | * @x: where to store the X axis value | |
91 | * @y: where to store the Y axis value | |
92 | * @z: where to store the Z axis value | |
93 | * | |
94 | * Note that 40Hz input device can eat up about 10% CPU at 800MHZ | |
95 | */ | |
96 | static void lis3lv02d_get_xyz(acpi_handle handle, int *x, int *y, int *z) | |
97 | { | |
98 | int position[3]; | |
99 | ||
be84cfc5 PM |
100 | position[0] = lis3_dev.read_data(handle, OUTX); |
101 | position[1] = lis3_dev.read_data(handle, OUTY); | |
102 | position[2] = lis3_dev.read_data(handle, OUTZ); | |
455fbdd3 | 103 | |
be84cfc5 PM |
104 | *x = lis3lv02d_get_axis(lis3_dev.ac.x, position); |
105 | *y = lis3lv02d_get_axis(lis3_dev.ac.y, position); | |
106 | *z = lis3lv02d_get_axis(lis3_dev.ac.z, position); | |
455fbdd3 PM |
107 | } |
108 | ||
cfce41a6 | 109 | void lis3lv02d_poweroff(acpi_handle handle) |
455fbdd3 | 110 | { |
be84cfc5 | 111 | lis3_dev.is_on = 0; |
455fbdd3 | 112 | } |
cfce41a6 | 113 | EXPORT_SYMBOL_GPL(lis3lv02d_poweroff); |
455fbdd3 | 114 | |
cfce41a6 | 115 | void lis3lv02d_poweron(acpi_handle handle) |
455fbdd3 | 116 | { |
be84cfc5 PM |
117 | lis3_dev.is_on = 1; |
118 | lis3_dev.init(handle); | |
455fbdd3 | 119 | } |
cfce41a6 | 120 | EXPORT_SYMBOL_GPL(lis3lv02d_poweron); |
455fbdd3 PM |
121 | |
122 | /* | |
123 | * To be called before starting to use the device. It makes sure that the | |
124 | * device will always be on until a call to lis3lv02d_decrease_use(). Not to be | |
125 | * used from interrupt context. | |
126 | */ | |
127 | static void lis3lv02d_increase_use(struct acpi_lis3lv02d *dev) | |
128 | { | |
129 | mutex_lock(&dev->lock); | |
130 | dev->usage++; | |
131 | if (dev->usage == 1) { | |
132 | if (!dev->is_on) | |
133 | lis3lv02d_poweron(dev->device->handle); | |
134 | } | |
135 | mutex_unlock(&dev->lock); | |
136 | } | |
137 | ||
138 | /* | |
139 | * To be called whenever a usage of the device is stopped. | |
140 | * It will make sure to turn off the device when there is not usage. | |
141 | */ | |
142 | static void lis3lv02d_decrease_use(struct acpi_lis3lv02d *dev) | |
143 | { | |
144 | mutex_lock(&dev->lock); | |
145 | dev->usage--; | |
146 | if (dev->usage == 0) | |
147 | lis3lv02d_poweroff(dev->device->handle); | |
148 | mutex_unlock(&dev->lock); | |
149 | } | |
150 | ||
ef2cfc79 PM |
151 | static irqreturn_t lis302dl_interrupt(int irq, void *dummy) |
152 | { | |
153 | /* | |
154 | * Be careful: on some HP laptops the bios force DD when on battery and | |
155 | * the lid is closed. This leads to interrupts as soon as a little move | |
156 | * is done. | |
157 | */ | |
be84cfc5 | 158 | atomic_inc(&lis3_dev.count); |
ef2cfc79 | 159 | |
be84cfc5 PM |
160 | wake_up_interruptible(&lis3_dev.misc_wait); |
161 | kill_fasync(&lis3_dev.async_queue, SIGIO, POLL_IN); | |
ef2cfc79 PM |
162 | return IRQ_HANDLED; |
163 | } | |
164 | ||
165 | static int lis3lv02d_misc_open(struct inode *inode, struct file *file) | |
166 | { | |
167 | int ret; | |
168 | ||
be84cfc5 | 169 | if (test_and_set_bit(0, &lis3_dev.misc_opened)) |
ef2cfc79 PM |
170 | return -EBUSY; /* already open */ |
171 | ||
be84cfc5 | 172 | atomic_set(&lis3_dev.count, 0); |
ef2cfc79 PM |
173 | |
174 | /* | |
175 | * The sensor can generate interrupts for free-fall and direction | |
176 | * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep | |
177 | * the things simple and _fast_ we activate it only for free-fall, so | |
178 | * no need to read register (very slow with ACPI). For the same reason, | |
179 | * we forbid shared interrupts. | |
180 | * | |
181 | * IRQF_TRIGGER_RISING seems pointless on HP laptops because the | |
182 | * io-apic is not configurable (and generates a warning) but I keep it | |
183 | * in case of support for other hardware. | |
184 | */ | |
be84cfc5 PM |
185 | ret = request_irq(lis3_dev.irq, lis302dl_interrupt, IRQF_TRIGGER_RISING, |
186 | DRIVER_NAME, &lis3_dev); | |
ef2cfc79 PM |
187 | |
188 | if (ret) { | |
be84cfc5 PM |
189 | clear_bit(0, &lis3_dev.misc_opened); |
190 | printk(KERN_ERR DRIVER_NAME ": IRQ%d allocation failed\n", lis3_dev.irq); | |
ef2cfc79 PM |
191 | return -EBUSY; |
192 | } | |
be84cfc5 PM |
193 | lis3lv02d_increase_use(&lis3_dev); |
194 | printk("lis3: registered interrupt %d\n", lis3_dev.irq); | |
ef2cfc79 PM |
195 | return 0; |
196 | } | |
197 | ||
198 | static int lis3lv02d_misc_release(struct inode *inode, struct file *file) | |
199 | { | |
be84cfc5 PM |
200 | fasync_helper(-1, file, 0, &lis3_dev.async_queue); |
201 | lis3lv02d_decrease_use(&lis3_dev); | |
202 | free_irq(lis3_dev.irq, &lis3_dev); | |
203 | clear_bit(0, &lis3_dev.misc_opened); /* release the device */ | |
ef2cfc79 PM |
204 | return 0; |
205 | } | |
206 | ||
207 | static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf, | |
208 | size_t count, loff_t *pos) | |
209 | { | |
210 | DECLARE_WAITQUEUE(wait, current); | |
211 | u32 data; | |
212 | unsigned char byte_data; | |
213 | ssize_t retval = 1; | |
214 | ||
215 | if (count < 1) | |
216 | return -EINVAL; | |
217 | ||
be84cfc5 | 218 | add_wait_queue(&lis3_dev.misc_wait, &wait); |
ef2cfc79 PM |
219 | while (true) { |
220 | set_current_state(TASK_INTERRUPTIBLE); | |
be84cfc5 | 221 | data = atomic_xchg(&lis3_dev.count, 0); |
ef2cfc79 PM |
222 | if (data) |
223 | break; | |
224 | ||
225 | if (file->f_flags & O_NONBLOCK) { | |
226 | retval = -EAGAIN; | |
227 | goto out; | |
228 | } | |
229 | ||
230 | if (signal_pending(current)) { | |
231 | retval = -ERESTARTSYS; | |
232 | goto out; | |
233 | } | |
234 | ||
235 | schedule(); | |
236 | } | |
237 | ||
238 | if (data < 255) | |
239 | byte_data = data; | |
240 | else | |
241 | byte_data = 255; | |
242 | ||
243 | /* make sure we are not going into copy_to_user() with | |
244 | * TASK_INTERRUPTIBLE state */ | |
245 | set_current_state(TASK_RUNNING); | |
246 | if (copy_to_user(buf, &byte_data, sizeof(byte_data))) | |
247 | retval = -EFAULT; | |
248 | ||
249 | out: | |
250 | __set_current_state(TASK_RUNNING); | |
be84cfc5 | 251 | remove_wait_queue(&lis3_dev.misc_wait, &wait); |
ef2cfc79 PM |
252 | |
253 | return retval; | |
254 | } | |
255 | ||
256 | static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait) | |
257 | { | |
be84cfc5 PM |
258 | poll_wait(file, &lis3_dev.misc_wait, wait); |
259 | if (atomic_read(&lis3_dev.count)) | |
ef2cfc79 PM |
260 | return POLLIN | POLLRDNORM; |
261 | return 0; | |
262 | } | |
263 | ||
264 | static int lis3lv02d_misc_fasync(int fd, struct file *file, int on) | |
265 | { | |
be84cfc5 | 266 | return fasync_helper(fd, file, on, &lis3_dev.async_queue); |
ef2cfc79 PM |
267 | } |
268 | ||
269 | static const struct file_operations lis3lv02d_misc_fops = { | |
270 | .owner = THIS_MODULE, | |
271 | .llseek = no_llseek, | |
272 | .read = lis3lv02d_misc_read, | |
273 | .open = lis3lv02d_misc_open, | |
274 | .release = lis3lv02d_misc_release, | |
275 | .poll = lis3lv02d_misc_poll, | |
276 | .fasync = lis3lv02d_misc_fasync, | |
277 | }; | |
278 | ||
279 | static struct miscdevice lis3lv02d_misc_device = { | |
280 | .minor = MISC_DYNAMIC_MINOR, | |
281 | .name = "freefall", | |
282 | .fops = &lis3lv02d_misc_fops, | |
283 | }; | |
284 | ||
455fbdd3 PM |
285 | /** |
286 | * lis3lv02d_joystick_kthread - Kthread polling function | |
287 | * @data: unused - here to conform to threadfn prototype | |
288 | */ | |
289 | static int lis3lv02d_joystick_kthread(void *data) | |
290 | { | |
291 | int x, y, z; | |
292 | ||
293 | while (!kthread_should_stop()) { | |
be84cfc5 PM |
294 | lis3lv02d_get_xyz(lis3_dev.device->handle, &x, &y, &z); |
295 | input_report_abs(lis3_dev.idev, ABS_X, x - lis3_dev.xcalib); | |
296 | input_report_abs(lis3_dev.idev, ABS_Y, y - lis3_dev.ycalib); | |
297 | input_report_abs(lis3_dev.idev, ABS_Z, z - lis3_dev.zcalib); | |
455fbdd3 | 298 | |
be84cfc5 | 299 | input_sync(lis3_dev.idev); |
455fbdd3 PM |
300 | |
301 | try_to_freeze(); | |
302 | msleep_interruptible(MDPS_POLL_INTERVAL); | |
303 | } | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
308 | static int lis3lv02d_joystick_open(struct input_dev *input) | |
309 | { | |
be84cfc5 PM |
310 | lis3lv02d_increase_use(&lis3_dev); |
311 | lis3_dev.kthread = kthread_run(lis3lv02d_joystick_kthread, NULL, "klis3lv02d"); | |
312 | if (IS_ERR(lis3_dev.kthread)) { | |
313 | lis3lv02d_decrease_use(&lis3_dev); | |
314 | return PTR_ERR(lis3_dev.kthread); | |
455fbdd3 PM |
315 | } |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
320 | static void lis3lv02d_joystick_close(struct input_dev *input) | |
321 | { | |
be84cfc5 PM |
322 | kthread_stop(lis3_dev.kthread); |
323 | lis3lv02d_decrease_use(&lis3_dev); | |
455fbdd3 PM |
324 | } |
325 | ||
455fbdd3 PM |
326 | static inline void lis3lv02d_calibrate_joystick(void) |
327 | { | |
be84cfc5 | 328 | lis3lv02d_get_xyz(lis3_dev.device->handle, &lis3_dev.xcalib, &lis3_dev.ycalib, &lis3_dev.zcalib); |
455fbdd3 PM |
329 | } |
330 | ||
cfce41a6 | 331 | int lis3lv02d_joystick_enable(void) |
455fbdd3 PM |
332 | { |
333 | int err; | |
334 | ||
be84cfc5 | 335 | if (lis3_dev.idev) |
455fbdd3 PM |
336 | return -EINVAL; |
337 | ||
be84cfc5 PM |
338 | lis3_dev.idev = input_allocate_device(); |
339 | if (!lis3_dev.idev) | |
455fbdd3 PM |
340 | return -ENOMEM; |
341 | ||
342 | lis3lv02d_calibrate_joystick(); | |
343 | ||
be84cfc5 PM |
344 | lis3_dev.idev->name = "ST LIS3LV02DL Accelerometer"; |
345 | lis3_dev.idev->phys = DRIVER_NAME "/input0"; | |
346 | lis3_dev.idev->id.bustype = BUS_HOST; | |
347 | lis3_dev.idev->id.vendor = 0; | |
348 | lis3_dev.idev->dev.parent = &lis3_dev.pdev->dev; | |
349 | lis3_dev.idev->open = lis3lv02d_joystick_open; | |
350 | lis3_dev.idev->close = lis3lv02d_joystick_close; | |
455fbdd3 | 351 | |
be84cfc5 PM |
352 | set_bit(EV_ABS, lis3_dev.idev->evbit); |
353 | input_set_abs_params(lis3_dev.idev, ABS_X, -lis3_dev.mdps_max_val, lis3_dev.mdps_max_val, 3, 3); | |
354 | input_set_abs_params(lis3_dev.idev, ABS_Y, -lis3_dev.mdps_max_val, lis3_dev.mdps_max_val, 3, 3); | |
355 | input_set_abs_params(lis3_dev.idev, ABS_Z, -lis3_dev.mdps_max_val, lis3_dev.mdps_max_val, 3, 3); | |
455fbdd3 | 356 | |
be84cfc5 | 357 | err = input_register_device(lis3_dev.idev); |
455fbdd3 | 358 | if (err) { |
be84cfc5 PM |
359 | input_free_device(lis3_dev.idev); |
360 | lis3_dev.idev = NULL; | |
455fbdd3 PM |
361 | } |
362 | ||
363 | return err; | |
364 | } | |
cfce41a6 | 365 | EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable); |
455fbdd3 | 366 | |
cfce41a6 | 367 | void lis3lv02d_joystick_disable(void) |
455fbdd3 | 368 | { |
be84cfc5 | 369 | if (!lis3_dev.idev) |
455fbdd3 PM |
370 | return; |
371 | ||
ef2cfc79 | 372 | misc_deregister(&lis3lv02d_misc_device); |
be84cfc5 PM |
373 | input_unregister_device(lis3_dev.idev); |
374 | lis3_dev.idev = NULL; | |
455fbdd3 | 375 | } |
cfce41a6 | 376 | EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable); |
455fbdd3 | 377 | |
455fbdd3 PM |
378 | /* Sysfs stuff */ |
379 | static ssize_t lis3lv02d_position_show(struct device *dev, | |
380 | struct device_attribute *attr, char *buf) | |
381 | { | |
382 | int x, y, z; | |
383 | ||
be84cfc5 PM |
384 | lis3lv02d_increase_use(&lis3_dev); |
385 | lis3lv02d_get_xyz(lis3_dev.device->handle, &x, &y, &z); | |
386 | lis3lv02d_decrease_use(&lis3_dev); | |
455fbdd3 PM |
387 | return sprintf(buf, "(%d,%d,%d)\n", x, y, z); |
388 | } | |
389 | ||
390 | static ssize_t lis3lv02d_calibrate_show(struct device *dev, | |
391 | struct device_attribute *attr, char *buf) | |
392 | { | |
be84cfc5 | 393 | return sprintf(buf, "(%d,%d,%d)\n", lis3_dev.xcalib, lis3_dev.ycalib, lis3_dev.zcalib); |
455fbdd3 PM |
394 | } |
395 | ||
396 | static ssize_t lis3lv02d_calibrate_store(struct device *dev, | |
397 | struct device_attribute *attr, | |
398 | const char *buf, size_t count) | |
399 | { | |
be84cfc5 | 400 | lis3lv02d_increase_use(&lis3_dev); |
455fbdd3 | 401 | lis3lv02d_calibrate_joystick(); |
be84cfc5 | 402 | lis3lv02d_decrease_use(&lis3_dev); |
455fbdd3 PM |
403 | return count; |
404 | } | |
405 | ||
406 | /* conversion btw sampling rate and the register values */ | |
407 | static int lis3lv02dl_df_val[4] = {40, 160, 640, 2560}; | |
408 | static ssize_t lis3lv02d_rate_show(struct device *dev, | |
409 | struct device_attribute *attr, char *buf) | |
410 | { | |
411 | u8 ctrl; | |
412 | int val; | |
413 | ||
be84cfc5 PM |
414 | lis3lv02d_increase_use(&lis3_dev); |
415 | lis3_dev.read(lis3_dev.device->handle, CTRL_REG1, &ctrl); | |
416 | lis3lv02d_decrease_use(&lis3_dev); | |
455fbdd3 PM |
417 | val = (ctrl & (CTRL1_DF0 | CTRL1_DF1)) >> 4; |
418 | return sprintf(buf, "%d\n", lis3lv02dl_df_val[val]); | |
419 | } | |
420 | ||
421 | static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL); | |
422 | static DEVICE_ATTR(calibrate, S_IRUGO|S_IWUSR, lis3lv02d_calibrate_show, | |
423 | lis3lv02d_calibrate_store); | |
424 | static DEVICE_ATTR(rate, S_IRUGO, lis3lv02d_rate_show, NULL); | |
425 | ||
426 | static struct attribute *lis3lv02d_attributes[] = { | |
427 | &dev_attr_position.attr, | |
428 | &dev_attr_calibrate.attr, | |
429 | &dev_attr_rate.attr, | |
430 | NULL | |
431 | }; | |
432 | ||
433 | static struct attribute_group lis3lv02d_attribute_group = { | |
434 | .attrs = lis3lv02d_attributes | |
435 | }; | |
436 | ||
cfce41a6 | 437 | |
455fbdd3 PM |
438 | static int lis3lv02d_add_fs(struct acpi_device *device) |
439 | { | |
be84cfc5 PM |
440 | lis3_dev.pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0); |
441 | if (IS_ERR(lis3_dev.pdev)) | |
442 | return PTR_ERR(lis3_dev.pdev); | |
455fbdd3 | 443 | |
be84cfc5 | 444 | return sysfs_create_group(&lis3_dev.pdev->dev.kobj, &lis3lv02d_attribute_group); |
455fbdd3 PM |
445 | } |
446 | ||
cfce41a6 | 447 | int lis3lv02d_remove_fs(void) |
455fbdd3 | 448 | { |
be84cfc5 PM |
449 | sysfs_remove_group(&lis3_dev.pdev->dev.kobj, &lis3lv02d_attribute_group); |
450 | platform_device_unregister(lis3_dev.pdev); | |
455fbdd3 PM |
451 | return 0; |
452 | } | |
cfce41a6 | 453 | EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs); |
455fbdd3 | 454 | |
ab337a63 DM |
455 | /* |
456 | * Initialise the accelerometer and the various subsystems. | |
457 | * Should be rather independant of the bus system. | |
458 | */ | |
459 | int lis3lv02d_init_device(struct acpi_lis3lv02d *dev) | |
460 | { | |
461 | mutex_init(&dev->lock); | |
462 | lis3lv02d_add_fs(dev->device); | |
463 | lis3lv02d_increase_use(dev); | |
464 | ||
465 | if (lis3lv02d_joystick_enable()) | |
466 | printk(KERN_ERR DRIVER_NAME ": joystick initialization failed\n"); | |
467 | ||
468 | printk("lis3_init_device: irq %d\n", dev->irq); | |
469 | ||
470 | /* if we did not get an IRQ from ACPI - we have nothing more to do */ | |
471 | if (!dev->irq) { | |
472 | printk(KERN_ERR DRIVER_NAME | |
473 | ": No IRQ in ACPI. Disabling /dev/freefall\n"); | |
474 | goto out; | |
475 | } | |
476 | ||
477 | printk("lis3: registering device\n"); | |
478 | if (misc_register(&lis3lv02d_misc_device)) | |
479 | printk(KERN_ERR DRIVER_NAME ": misc_register failed\n"); | |
480 | out: | |
481 | lis3lv02d_decrease_use(dev); | |
482 | return 0; | |
483 | } | |
484 | EXPORT_SYMBOL_GPL(lis3lv02d_init_device); | |
485 | ||
455fbdd3 | 486 | MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver"); |
ef2cfc79 | 487 | MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek"); |
455fbdd3 PM |
488 | MODULE_LICENSE("GPL"); |
489 |