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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 <asm/atomic.h> |
40 | #include "lis3lv02d.h" | |
41 | ||
42 | #define DRIVER_NAME "lis3lv02d" | |
455fbdd3 PM |
43 | |
44 | /* joystick device poll interval in milliseconds */ | |
45 | #define MDPS_POLL_INTERVAL 50 | |
46 | /* | |
47 | * The sensor can also generate interrupts (DRDY) but it's pretty pointless | |
48 | * because their are generated even if the data do not change. So it's better | |
49 | * to keep the interrupt for the free-fall event. The values are updated at | |
50 | * 40Hz (at the lowest frequency), but as it can be pretty time consuming on | |
51 | * some low processor, we poll the sensor only at 20Hz... enough for the | |
52 | * joystick. | |
53 | */ | |
54 | ||
a38da2ed | 55 | struct lis3lv02d lis3_dev = { |
be84cfc5 | 56 | .misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait), |
ef2cfc79 PM |
57 | }; |
58 | ||
be84cfc5 | 59 | EXPORT_SYMBOL_GPL(lis3_dev); |
455fbdd3 | 60 | |
a38da2ed DM |
61 | static s16 lis3lv02d_read_8(struct lis3lv02d *lis3, int reg) |
62 | { | |
63 | s8 lo; | |
64 | if (lis3->read(lis3, reg, &lo) < 0) | |
65 | return 0; | |
66 | ||
67 | return lo; | |
68 | } | |
69 | ||
70 | static s16 lis3lv02d_read_16(struct lis3lv02d *lis3, int reg) | |
be84cfc5 PM |
71 | { |
72 | u8 lo, hi; | |
73 | ||
a38da2ed DM |
74 | lis3->read(lis3, reg - 1, &lo); |
75 | lis3->read(lis3, reg, &hi); | |
be84cfc5 PM |
76 | /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */ |
77 | return (s16)((hi << 8) | lo); | |
78 | } | |
79 | ||
455fbdd3 PM |
80 | /** |
81 | * lis3lv02d_get_axis - For the given axis, give the value converted | |
82 | * @axis: 1,2,3 - can also be negative | |
83 | * @hw_values: raw values returned by the hardware | |
84 | * | |
85 | * Returns the converted value. | |
86 | */ | |
87 | static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3]) | |
88 | { | |
89 | if (axis > 0) | |
90 | return hw_values[axis - 1]; | |
91 | else | |
92 | return -hw_values[-axis - 1]; | |
93 | } | |
94 | ||
95 | /** | |
96 | * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer | |
a38da2ed DM |
97 | * @lis3: pointer to the device struct |
98 | * @x: where to store the X axis value | |
99 | * @y: where to store the Y axis value | |
100 | * @z: where to store the Z axis value | |
455fbdd3 PM |
101 | * |
102 | * Note that 40Hz input device can eat up about 10% CPU at 800MHZ | |
103 | */ | |
a38da2ed | 104 | static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z) |
455fbdd3 PM |
105 | { |
106 | int position[3]; | |
107 | ||
a38da2ed DM |
108 | position[0] = lis3_dev.read_data(lis3, OUTX); |
109 | position[1] = lis3_dev.read_data(lis3, OUTY); | |
110 | position[2] = lis3_dev.read_data(lis3, OUTZ); | |
455fbdd3 | 111 | |
be84cfc5 PM |
112 | *x = lis3lv02d_get_axis(lis3_dev.ac.x, position); |
113 | *y = lis3lv02d_get_axis(lis3_dev.ac.y, position); | |
114 | *z = lis3lv02d_get_axis(lis3_dev.ac.z, position); | |
455fbdd3 PM |
115 | } |
116 | ||
a38da2ed | 117 | void lis3lv02d_poweroff(struct lis3lv02d *lis3) |
455fbdd3 | 118 | { |
be84cfc5 | 119 | lis3_dev.is_on = 0; |
455fbdd3 | 120 | } |
cfce41a6 | 121 | EXPORT_SYMBOL_GPL(lis3lv02d_poweroff); |
455fbdd3 | 122 | |
a38da2ed | 123 | void lis3lv02d_poweron(struct lis3lv02d *lis3) |
455fbdd3 | 124 | { |
be84cfc5 | 125 | lis3_dev.is_on = 1; |
a38da2ed | 126 | lis3_dev.init(lis3); |
455fbdd3 | 127 | } |
cfce41a6 | 128 | EXPORT_SYMBOL_GPL(lis3lv02d_poweron); |
455fbdd3 PM |
129 | |
130 | /* | |
131 | * To be called before starting to use the device. It makes sure that the | |
132 | * device will always be on until a call to lis3lv02d_decrease_use(). Not to be | |
133 | * used from interrupt context. | |
134 | */ | |
a38da2ed | 135 | static void lis3lv02d_increase_use(struct lis3lv02d *dev) |
455fbdd3 PM |
136 | { |
137 | mutex_lock(&dev->lock); | |
138 | dev->usage++; | |
139 | if (dev->usage == 1) { | |
140 | if (!dev->is_on) | |
a38da2ed | 141 | lis3lv02d_poweron(dev); |
455fbdd3 PM |
142 | } |
143 | mutex_unlock(&dev->lock); | |
144 | } | |
145 | ||
146 | /* | |
147 | * To be called whenever a usage of the device is stopped. | |
148 | * It will make sure to turn off the device when there is not usage. | |
149 | */ | |
a38da2ed | 150 | static void lis3lv02d_decrease_use(struct lis3lv02d *dev) |
455fbdd3 PM |
151 | { |
152 | mutex_lock(&dev->lock); | |
153 | dev->usage--; | |
154 | if (dev->usage == 0) | |
a38da2ed | 155 | lis3lv02d_poweroff(dev); |
455fbdd3 PM |
156 | mutex_unlock(&dev->lock); |
157 | } | |
158 | ||
ef2cfc79 PM |
159 | static irqreturn_t lis302dl_interrupt(int irq, void *dummy) |
160 | { | |
161 | /* | |
162 | * Be careful: on some HP laptops the bios force DD when on battery and | |
163 | * the lid is closed. This leads to interrupts as soon as a little move | |
164 | * is done. | |
165 | */ | |
be84cfc5 | 166 | atomic_inc(&lis3_dev.count); |
ef2cfc79 | 167 | |
be84cfc5 PM |
168 | wake_up_interruptible(&lis3_dev.misc_wait); |
169 | kill_fasync(&lis3_dev.async_queue, SIGIO, POLL_IN); | |
ef2cfc79 PM |
170 | return IRQ_HANDLED; |
171 | } | |
172 | ||
173 | static int lis3lv02d_misc_open(struct inode *inode, struct file *file) | |
174 | { | |
175 | int ret; | |
176 | ||
be84cfc5 | 177 | if (test_and_set_bit(0, &lis3_dev.misc_opened)) |
ef2cfc79 PM |
178 | return -EBUSY; /* already open */ |
179 | ||
be84cfc5 | 180 | atomic_set(&lis3_dev.count, 0); |
ef2cfc79 PM |
181 | |
182 | /* | |
183 | * The sensor can generate interrupts for free-fall and direction | |
184 | * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep | |
185 | * the things simple and _fast_ we activate it only for free-fall, so | |
186 | * no need to read register (very slow with ACPI). For the same reason, | |
187 | * we forbid shared interrupts. | |
188 | * | |
189 | * IRQF_TRIGGER_RISING seems pointless on HP laptops because the | |
190 | * io-apic is not configurable (and generates a warning) but I keep it | |
191 | * in case of support for other hardware. | |
192 | */ | |
be84cfc5 PM |
193 | ret = request_irq(lis3_dev.irq, lis302dl_interrupt, IRQF_TRIGGER_RISING, |
194 | DRIVER_NAME, &lis3_dev); | |
ef2cfc79 PM |
195 | |
196 | if (ret) { | |
be84cfc5 PM |
197 | clear_bit(0, &lis3_dev.misc_opened); |
198 | printk(KERN_ERR DRIVER_NAME ": IRQ%d allocation failed\n", lis3_dev.irq); | |
ef2cfc79 PM |
199 | return -EBUSY; |
200 | } | |
be84cfc5 PM |
201 | lis3lv02d_increase_use(&lis3_dev); |
202 | printk("lis3: registered interrupt %d\n", lis3_dev.irq); | |
ef2cfc79 PM |
203 | return 0; |
204 | } | |
205 | ||
206 | static int lis3lv02d_misc_release(struct inode *inode, struct file *file) | |
207 | { | |
be84cfc5 PM |
208 | fasync_helper(-1, file, 0, &lis3_dev.async_queue); |
209 | lis3lv02d_decrease_use(&lis3_dev); | |
210 | free_irq(lis3_dev.irq, &lis3_dev); | |
211 | clear_bit(0, &lis3_dev.misc_opened); /* release the device */ | |
ef2cfc79 PM |
212 | return 0; |
213 | } | |
214 | ||
215 | static ssize_t lis3lv02d_misc_read(struct file *file, char __user *buf, | |
216 | size_t count, loff_t *pos) | |
217 | { | |
218 | DECLARE_WAITQUEUE(wait, current); | |
219 | u32 data; | |
220 | unsigned char byte_data; | |
221 | ssize_t retval = 1; | |
222 | ||
223 | if (count < 1) | |
224 | return -EINVAL; | |
225 | ||
be84cfc5 | 226 | add_wait_queue(&lis3_dev.misc_wait, &wait); |
ef2cfc79 PM |
227 | while (true) { |
228 | set_current_state(TASK_INTERRUPTIBLE); | |
be84cfc5 | 229 | data = atomic_xchg(&lis3_dev.count, 0); |
ef2cfc79 PM |
230 | if (data) |
231 | break; | |
232 | ||
233 | if (file->f_flags & O_NONBLOCK) { | |
234 | retval = -EAGAIN; | |
235 | goto out; | |
236 | } | |
237 | ||
238 | if (signal_pending(current)) { | |
239 | retval = -ERESTARTSYS; | |
240 | goto out; | |
241 | } | |
242 | ||
243 | schedule(); | |
244 | } | |
245 | ||
246 | if (data < 255) | |
247 | byte_data = data; | |
248 | else | |
249 | byte_data = 255; | |
250 | ||
251 | /* make sure we are not going into copy_to_user() with | |
252 | * TASK_INTERRUPTIBLE state */ | |
253 | set_current_state(TASK_RUNNING); | |
254 | if (copy_to_user(buf, &byte_data, sizeof(byte_data))) | |
255 | retval = -EFAULT; | |
256 | ||
257 | out: | |
258 | __set_current_state(TASK_RUNNING); | |
be84cfc5 | 259 | remove_wait_queue(&lis3_dev.misc_wait, &wait); |
ef2cfc79 PM |
260 | |
261 | return retval; | |
262 | } | |
263 | ||
264 | static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait) | |
265 | { | |
be84cfc5 PM |
266 | poll_wait(file, &lis3_dev.misc_wait, wait); |
267 | if (atomic_read(&lis3_dev.count)) | |
ef2cfc79 PM |
268 | return POLLIN | POLLRDNORM; |
269 | return 0; | |
270 | } | |
271 | ||
272 | static int lis3lv02d_misc_fasync(int fd, struct file *file, int on) | |
273 | { | |
be84cfc5 | 274 | return fasync_helper(fd, file, on, &lis3_dev.async_queue); |
ef2cfc79 PM |
275 | } |
276 | ||
277 | static const struct file_operations lis3lv02d_misc_fops = { | |
278 | .owner = THIS_MODULE, | |
279 | .llseek = no_llseek, | |
280 | .read = lis3lv02d_misc_read, | |
281 | .open = lis3lv02d_misc_open, | |
282 | .release = lis3lv02d_misc_release, | |
283 | .poll = lis3lv02d_misc_poll, | |
284 | .fasync = lis3lv02d_misc_fasync, | |
285 | }; | |
286 | ||
287 | static struct miscdevice lis3lv02d_misc_device = { | |
288 | .minor = MISC_DYNAMIC_MINOR, | |
289 | .name = "freefall", | |
290 | .fops = &lis3lv02d_misc_fops, | |
291 | }; | |
292 | ||
455fbdd3 PM |
293 | /** |
294 | * lis3lv02d_joystick_kthread - Kthread polling function | |
295 | * @data: unused - here to conform to threadfn prototype | |
296 | */ | |
297 | static int lis3lv02d_joystick_kthread(void *data) | |
298 | { | |
299 | int x, y, z; | |
300 | ||
301 | while (!kthread_should_stop()) { | |
a38da2ed | 302 | lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z); |
be84cfc5 PM |
303 | input_report_abs(lis3_dev.idev, ABS_X, x - lis3_dev.xcalib); |
304 | input_report_abs(lis3_dev.idev, ABS_Y, y - lis3_dev.ycalib); | |
305 | input_report_abs(lis3_dev.idev, ABS_Z, z - lis3_dev.zcalib); | |
455fbdd3 | 306 | |
be84cfc5 | 307 | input_sync(lis3_dev.idev); |
455fbdd3 PM |
308 | |
309 | try_to_freeze(); | |
310 | msleep_interruptible(MDPS_POLL_INTERVAL); | |
311 | } | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
316 | static int lis3lv02d_joystick_open(struct input_dev *input) | |
317 | { | |
be84cfc5 PM |
318 | lis3lv02d_increase_use(&lis3_dev); |
319 | lis3_dev.kthread = kthread_run(lis3lv02d_joystick_kthread, NULL, "klis3lv02d"); | |
320 | if (IS_ERR(lis3_dev.kthread)) { | |
321 | lis3lv02d_decrease_use(&lis3_dev); | |
322 | return PTR_ERR(lis3_dev.kthread); | |
455fbdd3 PM |
323 | } |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | static void lis3lv02d_joystick_close(struct input_dev *input) | |
329 | { | |
be84cfc5 PM |
330 | kthread_stop(lis3_dev.kthread); |
331 | lis3lv02d_decrease_use(&lis3_dev); | |
455fbdd3 PM |
332 | } |
333 | ||
455fbdd3 PM |
334 | static inline void lis3lv02d_calibrate_joystick(void) |
335 | { | |
a38da2ed DM |
336 | lis3lv02d_get_xyz(&lis3_dev, |
337 | &lis3_dev.xcalib, &lis3_dev.ycalib, &lis3_dev.zcalib); | |
455fbdd3 PM |
338 | } |
339 | ||
cfce41a6 | 340 | int lis3lv02d_joystick_enable(void) |
455fbdd3 PM |
341 | { |
342 | int err; | |
343 | ||
be84cfc5 | 344 | if (lis3_dev.idev) |
455fbdd3 PM |
345 | return -EINVAL; |
346 | ||
be84cfc5 PM |
347 | lis3_dev.idev = input_allocate_device(); |
348 | if (!lis3_dev.idev) | |
455fbdd3 PM |
349 | return -ENOMEM; |
350 | ||
351 | lis3lv02d_calibrate_joystick(); | |
352 | ||
be84cfc5 PM |
353 | lis3_dev.idev->name = "ST LIS3LV02DL Accelerometer"; |
354 | lis3_dev.idev->phys = DRIVER_NAME "/input0"; | |
355 | lis3_dev.idev->id.bustype = BUS_HOST; | |
356 | lis3_dev.idev->id.vendor = 0; | |
357 | lis3_dev.idev->dev.parent = &lis3_dev.pdev->dev; | |
358 | lis3_dev.idev->open = lis3lv02d_joystick_open; | |
359 | lis3_dev.idev->close = lis3lv02d_joystick_close; | |
455fbdd3 | 360 | |
be84cfc5 PM |
361 | set_bit(EV_ABS, lis3_dev.idev->evbit); |
362 | input_set_abs_params(lis3_dev.idev, ABS_X, -lis3_dev.mdps_max_val, lis3_dev.mdps_max_val, 3, 3); | |
363 | input_set_abs_params(lis3_dev.idev, ABS_Y, -lis3_dev.mdps_max_val, lis3_dev.mdps_max_val, 3, 3); | |
364 | input_set_abs_params(lis3_dev.idev, ABS_Z, -lis3_dev.mdps_max_val, lis3_dev.mdps_max_val, 3, 3); | |
455fbdd3 | 365 | |
be84cfc5 | 366 | err = input_register_device(lis3_dev.idev); |
455fbdd3 | 367 | if (err) { |
be84cfc5 PM |
368 | input_free_device(lis3_dev.idev); |
369 | lis3_dev.idev = NULL; | |
455fbdd3 PM |
370 | } |
371 | ||
372 | return err; | |
373 | } | |
cfce41a6 | 374 | EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable); |
455fbdd3 | 375 | |
cfce41a6 | 376 | void lis3lv02d_joystick_disable(void) |
455fbdd3 | 377 | { |
be84cfc5 | 378 | if (!lis3_dev.idev) |
455fbdd3 PM |
379 | return; |
380 | ||
ef2cfc79 | 381 | misc_deregister(&lis3lv02d_misc_device); |
be84cfc5 PM |
382 | input_unregister_device(lis3_dev.idev); |
383 | lis3_dev.idev = NULL; | |
455fbdd3 | 384 | } |
cfce41a6 | 385 | EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable); |
455fbdd3 | 386 | |
455fbdd3 PM |
387 | /* Sysfs stuff */ |
388 | static ssize_t lis3lv02d_position_show(struct device *dev, | |
389 | struct device_attribute *attr, char *buf) | |
390 | { | |
391 | int x, y, z; | |
392 | ||
be84cfc5 | 393 | lis3lv02d_increase_use(&lis3_dev); |
a38da2ed | 394 | lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z); |
be84cfc5 | 395 | lis3lv02d_decrease_use(&lis3_dev); |
455fbdd3 PM |
396 | return sprintf(buf, "(%d,%d,%d)\n", x, y, z); |
397 | } | |
398 | ||
399 | static ssize_t lis3lv02d_calibrate_show(struct device *dev, | |
400 | struct device_attribute *attr, char *buf) | |
401 | { | |
be84cfc5 | 402 | return sprintf(buf, "(%d,%d,%d)\n", lis3_dev.xcalib, lis3_dev.ycalib, lis3_dev.zcalib); |
455fbdd3 PM |
403 | } |
404 | ||
405 | static ssize_t lis3lv02d_calibrate_store(struct device *dev, | |
406 | struct device_attribute *attr, | |
407 | const char *buf, size_t count) | |
408 | { | |
be84cfc5 | 409 | lis3lv02d_increase_use(&lis3_dev); |
455fbdd3 | 410 | lis3lv02d_calibrate_joystick(); |
be84cfc5 | 411 | lis3lv02d_decrease_use(&lis3_dev); |
455fbdd3 PM |
412 | return count; |
413 | } | |
414 | ||
415 | /* conversion btw sampling rate and the register values */ | |
416 | static int lis3lv02dl_df_val[4] = {40, 160, 640, 2560}; | |
417 | static ssize_t lis3lv02d_rate_show(struct device *dev, | |
418 | struct device_attribute *attr, char *buf) | |
419 | { | |
420 | u8 ctrl; | |
421 | int val; | |
422 | ||
be84cfc5 | 423 | lis3lv02d_increase_use(&lis3_dev); |
a38da2ed | 424 | lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl); |
be84cfc5 | 425 | lis3lv02d_decrease_use(&lis3_dev); |
455fbdd3 PM |
426 | val = (ctrl & (CTRL1_DF0 | CTRL1_DF1)) >> 4; |
427 | return sprintf(buf, "%d\n", lis3lv02dl_df_val[val]); | |
428 | } | |
429 | ||
430 | static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL); | |
431 | static DEVICE_ATTR(calibrate, S_IRUGO|S_IWUSR, lis3lv02d_calibrate_show, | |
432 | lis3lv02d_calibrate_store); | |
433 | static DEVICE_ATTR(rate, S_IRUGO, lis3lv02d_rate_show, NULL); | |
434 | ||
435 | static struct attribute *lis3lv02d_attributes[] = { | |
436 | &dev_attr_position.attr, | |
437 | &dev_attr_calibrate.attr, | |
438 | &dev_attr_rate.attr, | |
439 | NULL | |
440 | }; | |
441 | ||
442 | static struct attribute_group lis3lv02d_attribute_group = { | |
443 | .attrs = lis3lv02d_attributes | |
444 | }; | |
445 | ||
cfce41a6 | 446 | |
a38da2ed | 447 | static int lis3lv02d_add_fs(struct lis3lv02d *lis3) |
455fbdd3 | 448 | { |
be84cfc5 PM |
449 | lis3_dev.pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0); |
450 | if (IS_ERR(lis3_dev.pdev)) | |
451 | return PTR_ERR(lis3_dev.pdev); | |
455fbdd3 | 452 | |
be84cfc5 | 453 | return sysfs_create_group(&lis3_dev.pdev->dev.kobj, &lis3lv02d_attribute_group); |
455fbdd3 PM |
454 | } |
455 | ||
cfce41a6 | 456 | int lis3lv02d_remove_fs(void) |
455fbdd3 | 457 | { |
be84cfc5 PM |
458 | sysfs_remove_group(&lis3_dev.pdev->dev.kobj, &lis3lv02d_attribute_group); |
459 | platform_device_unregister(lis3_dev.pdev); | |
455fbdd3 PM |
460 | return 0; |
461 | } | |
cfce41a6 | 462 | EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs); |
455fbdd3 | 463 | |
ab337a63 DM |
464 | /* |
465 | * Initialise the accelerometer and the various subsystems. | |
466 | * Should be rather independant of the bus system. | |
467 | */ | |
a38da2ed | 468 | int lis3lv02d_init_device(struct lis3lv02d *dev) |
ab337a63 | 469 | { |
a38da2ed DM |
470 | dev->whoami = lis3lv02d_read_8(dev, WHO_AM_I); |
471 | ||
472 | switch (dev->whoami) { | |
473 | case LIS_DOUBLE_ID: | |
474 | printk(KERN_INFO DRIVER_NAME ": 2-byte sensor found\n"); | |
475 | dev->read_data = lis3lv02d_read_16; | |
476 | dev->mdps_max_val = 2048; | |
477 | break; | |
478 | case LIS_SINGLE_ID: | |
479 | printk(KERN_INFO DRIVER_NAME ": 1-byte sensor found\n"); | |
480 | dev->read_data = lis3lv02d_read_8; | |
481 | dev->mdps_max_val = 128; | |
482 | break; | |
483 | default: | |
484 | printk(KERN_ERR DRIVER_NAME | |
485 | ": unknown sensor type 0x%X\n", lis3_dev.whoami); | |
486 | return -EINVAL; | |
487 | } | |
488 | ||
ab337a63 | 489 | mutex_init(&dev->lock); |
a38da2ed | 490 | lis3lv02d_add_fs(dev); |
ab337a63 DM |
491 | lis3lv02d_increase_use(dev); |
492 | ||
493 | if (lis3lv02d_joystick_enable()) | |
494 | printk(KERN_ERR DRIVER_NAME ": joystick initialization failed\n"); | |
495 | ||
496 | printk("lis3_init_device: irq %d\n", dev->irq); | |
497 | ||
a38da2ed | 498 | /* bail if we did not get an IRQ from the bus layer */ |
ab337a63 DM |
499 | if (!dev->irq) { |
500 | printk(KERN_ERR DRIVER_NAME | |
a38da2ed | 501 | ": No IRQ. Disabling /dev/freefall\n"); |
ab337a63 DM |
502 | goto out; |
503 | } | |
504 | ||
505 | printk("lis3: registering device\n"); | |
506 | if (misc_register(&lis3lv02d_misc_device)) | |
507 | printk(KERN_ERR DRIVER_NAME ": misc_register failed\n"); | |
508 | out: | |
509 | lis3lv02d_decrease_use(dev); | |
510 | return 0; | |
511 | } | |
512 | EXPORT_SYMBOL_GPL(lis3lv02d_init_device); | |
513 | ||
455fbdd3 | 514 | MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver"); |
ef2cfc79 | 515 | MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek"); |
455fbdd3 PM |
516 | MODULE_LICENSE("GPL"); |
517 |