blob: 778eb77959837eed9c1172cfe4524d0273434b54 [file] [log] [blame]
Pavel Machek455fbdd2008-11-12 13:27:02 -08001/*
2 * lis3lv02d.c - ST LIS3LV02DL accelerometer driver
3 *
4 * Copyright (C) 2007-2008 Yan Burman
5 * Copyright (C) 2008 Eric Piel
Pavel Machekef2cfc72009-02-18 14:48:23 -08006 * Copyright (C) 2008-2009 Pavel Machek
Pavel Machek455fbdd2008-11-12 13:27:02 -08007 *
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>
Pavel Machek455fbdd2008-11-12 13:27:02 -080037#include <linux/uaccess.h>
Pavel Machekef2cfc72009-02-18 14:48:23 -080038#include <linux/miscdevice.h>
Pavel Machek455fbdd2008-11-12 13:27:02 -080039#include <asm/atomic.h>
40#include "lis3lv02d.h"
41
42#define DRIVER_NAME "lis3lv02d"
Pavel Machek455fbdd2008-11-12 13:27:02 -080043
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
Daniel Macka38da2e2009-03-31 15:24:32 -070055struct lis3lv02d lis3_dev = {
Pavel Machekbe84cfc2009-03-31 15:24:26 -070056 .misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),
Pavel Machekef2cfc72009-02-18 14:48:23 -080057};
58
Pavel Machekbe84cfc2009-03-31 15:24:26 -070059EXPORT_SYMBOL_GPL(lis3_dev);
Pavel Machek455fbdd2008-11-12 13:27:02 -080060
Daniel Macka38da2e2009-03-31 15:24:32 -070061static 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
70static s16 lis3lv02d_read_16(struct lis3lv02d *lis3, int reg)
Pavel Machekbe84cfc2009-03-31 15:24:26 -070071{
72 u8 lo, hi;
73
Daniel Macka38da2e2009-03-31 15:24:32 -070074 lis3->read(lis3, reg - 1, &lo);
75 lis3->read(lis3, reg, &hi);
Pavel Machekbe84cfc2009-03-31 15:24:26 -070076 /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
77 return (s16)((hi << 8) | lo);
78}
79
Pavel Machek455fbdd2008-11-12 13:27:02 -080080/**
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 */
87static 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
Daniel Macka38da2e2009-03-31 15:24:32 -070097 * @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
Pavel Machek455fbdd2008-11-12 13:27:02 -0800101 *
102 * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
103 */
Daniel Macka38da2e2009-03-31 15:24:32 -0700104static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
Pavel Machek455fbdd2008-11-12 13:27:02 -0800105{
106 int position[3];
107
Daniel Macka38da2e2009-03-31 15:24:32 -0700108 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);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800111
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700112 *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);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800115}
116
Daniel Macka38da2e2009-03-31 15:24:32 -0700117void lis3lv02d_poweroff(struct lis3lv02d *lis3)
Pavel Machek455fbdd2008-11-12 13:27:02 -0800118{
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700119 lis3_dev.is_on = 0;
Pavel Machek455fbdd2008-11-12 13:27:02 -0800120}
Eric Pielcfce41a2009-01-09 16:41:01 -0800121EXPORT_SYMBOL_GPL(lis3lv02d_poweroff);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800122
Daniel Macka38da2e2009-03-31 15:24:32 -0700123void lis3lv02d_poweron(struct lis3lv02d *lis3)
Pavel Machek455fbdd2008-11-12 13:27:02 -0800124{
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700125 lis3_dev.is_on = 1;
Daniel Macka38da2e2009-03-31 15:24:32 -0700126 lis3_dev.init(lis3);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800127}
Eric Pielcfce41a2009-01-09 16:41:01 -0800128EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800129
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 */
Daniel Macka38da2e2009-03-31 15:24:32 -0700135static void lis3lv02d_increase_use(struct lis3lv02d *dev)
Pavel Machek455fbdd2008-11-12 13:27:02 -0800136{
137 mutex_lock(&dev->lock);
138 dev->usage++;
139 if (dev->usage == 1) {
140 if (!dev->is_on)
Daniel Macka38da2e2009-03-31 15:24:32 -0700141 lis3lv02d_poweron(dev);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800142 }
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 */
Daniel Macka38da2e2009-03-31 15:24:32 -0700150static void lis3lv02d_decrease_use(struct lis3lv02d *dev)
Pavel Machek455fbdd2008-11-12 13:27:02 -0800151{
152 mutex_lock(&dev->lock);
153 dev->usage--;
154 if (dev->usage == 0)
Daniel Macka38da2e2009-03-31 15:24:32 -0700155 lis3lv02d_poweroff(dev);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800156 mutex_unlock(&dev->lock);
157}
158
Pavel Machekef2cfc72009-02-18 14:48:23 -0800159static 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 */
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700166 atomic_inc(&lis3_dev.count);
Pavel Machekef2cfc72009-02-18 14:48:23 -0800167
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700168 wake_up_interruptible(&lis3_dev.misc_wait);
169 kill_fasync(&lis3_dev.async_queue, SIGIO, POLL_IN);
Pavel Machekef2cfc72009-02-18 14:48:23 -0800170 return IRQ_HANDLED;
171}
172
173static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
174{
175 int ret;
176
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700177 if (test_and_set_bit(0, &lis3_dev.misc_opened))
Pavel Machekef2cfc72009-02-18 14:48:23 -0800178 return -EBUSY; /* already open */
179
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700180 atomic_set(&lis3_dev.count, 0);
Pavel Machekef2cfc72009-02-18 14:48:23 -0800181
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 */
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700193 ret = request_irq(lis3_dev.irq, lis302dl_interrupt, IRQF_TRIGGER_RISING,
194 DRIVER_NAME, &lis3_dev);
Pavel Machekef2cfc72009-02-18 14:48:23 -0800195
196 if (ret) {
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700197 clear_bit(0, &lis3_dev.misc_opened);
198 printk(KERN_ERR DRIVER_NAME ": IRQ%d allocation failed\n", lis3_dev.irq);
Pavel Machekef2cfc72009-02-18 14:48:23 -0800199 return -EBUSY;
200 }
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700201 lis3lv02d_increase_use(&lis3_dev);
202 printk("lis3: registered interrupt %d\n", lis3_dev.irq);
Pavel Machekef2cfc72009-02-18 14:48:23 -0800203 return 0;
204}
205
206static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
207{
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700208 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 */
Pavel Machekef2cfc72009-02-18 14:48:23 -0800212 return 0;
213}
214
215static 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
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700226 add_wait_queue(&lis3_dev.misc_wait, &wait);
Pavel Machekef2cfc72009-02-18 14:48:23 -0800227 while (true) {
228 set_current_state(TASK_INTERRUPTIBLE);
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700229 data = atomic_xchg(&lis3_dev.count, 0);
Pavel Machekef2cfc72009-02-18 14:48:23 -0800230 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
257out:
258 __set_current_state(TASK_RUNNING);
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700259 remove_wait_queue(&lis3_dev.misc_wait, &wait);
Pavel Machekef2cfc72009-02-18 14:48:23 -0800260
261 return retval;
262}
263
264static unsigned int lis3lv02d_misc_poll(struct file *file, poll_table *wait)
265{
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700266 poll_wait(file, &lis3_dev.misc_wait, wait);
267 if (atomic_read(&lis3_dev.count))
Pavel Machekef2cfc72009-02-18 14:48:23 -0800268 return POLLIN | POLLRDNORM;
269 return 0;
270}
271
272static int lis3lv02d_misc_fasync(int fd, struct file *file, int on)
273{
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700274 return fasync_helper(fd, file, on, &lis3_dev.async_queue);
Pavel Machekef2cfc72009-02-18 14:48:23 -0800275}
276
277static 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
287static struct miscdevice lis3lv02d_misc_device = {
288 .minor = MISC_DYNAMIC_MINOR,
289 .name = "freefall",
290 .fops = &lis3lv02d_misc_fops,
291};
292
Pavel Machek455fbdd2008-11-12 13:27:02 -0800293/**
294 * lis3lv02d_joystick_kthread - Kthread polling function
295 * @data: unused - here to conform to threadfn prototype
296 */
297static int lis3lv02d_joystick_kthread(void *data)
298{
299 int x, y, z;
300
301 while (!kthread_should_stop()) {
Daniel Macka38da2e2009-03-31 15:24:32 -0700302 lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700303 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);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800306
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700307 input_sync(lis3_dev.idev);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800308
309 try_to_freeze();
310 msleep_interruptible(MDPS_POLL_INTERVAL);
311 }
312
313 return 0;
314}
315
316static int lis3lv02d_joystick_open(struct input_dev *input)
317{
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700318 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);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800323 }
324
325 return 0;
326}
327
328static void lis3lv02d_joystick_close(struct input_dev *input)
329{
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700330 kthread_stop(lis3_dev.kthread);
331 lis3lv02d_decrease_use(&lis3_dev);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800332}
333
Pavel Machek455fbdd2008-11-12 13:27:02 -0800334static inline void lis3lv02d_calibrate_joystick(void)
335{
Daniel Macka38da2e2009-03-31 15:24:32 -0700336 lis3lv02d_get_xyz(&lis3_dev,
337 &lis3_dev.xcalib, &lis3_dev.ycalib, &lis3_dev.zcalib);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800338}
339
Eric Pielcfce41a2009-01-09 16:41:01 -0800340int lis3lv02d_joystick_enable(void)
Pavel Machek455fbdd2008-11-12 13:27:02 -0800341{
342 int err;
343
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700344 if (lis3_dev.idev)
Pavel Machek455fbdd2008-11-12 13:27:02 -0800345 return -EINVAL;
346
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700347 lis3_dev.idev = input_allocate_device();
348 if (!lis3_dev.idev)
Pavel Machek455fbdd2008-11-12 13:27:02 -0800349 return -ENOMEM;
350
351 lis3lv02d_calibrate_joystick();
352
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700353 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;
Pavel Machek455fbdd2008-11-12 13:27:02 -0800360
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700361 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);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800365
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700366 err = input_register_device(lis3_dev.idev);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800367 if (err) {
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700368 input_free_device(lis3_dev.idev);
369 lis3_dev.idev = NULL;
Pavel Machek455fbdd2008-11-12 13:27:02 -0800370 }
371
372 return err;
373}
Eric Pielcfce41a2009-01-09 16:41:01 -0800374EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800375
Eric Pielcfce41a2009-01-09 16:41:01 -0800376void lis3lv02d_joystick_disable(void)
Pavel Machek455fbdd2008-11-12 13:27:02 -0800377{
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700378 if (!lis3_dev.idev)
Pavel Machek455fbdd2008-11-12 13:27:02 -0800379 return;
380
Pavel Machekef2cfc72009-02-18 14:48:23 -0800381 misc_deregister(&lis3lv02d_misc_device);
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700382 input_unregister_device(lis3_dev.idev);
383 lis3_dev.idev = NULL;
Pavel Machek455fbdd2008-11-12 13:27:02 -0800384}
Eric Pielcfce41a2009-01-09 16:41:01 -0800385EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800386
Pavel Machek455fbdd2008-11-12 13:27:02 -0800387/* Sysfs stuff */
388static ssize_t lis3lv02d_position_show(struct device *dev,
389 struct device_attribute *attr, char *buf)
390{
391 int x, y, z;
392
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700393 lis3lv02d_increase_use(&lis3_dev);
Daniel Macka38da2e2009-03-31 15:24:32 -0700394 lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700395 lis3lv02d_decrease_use(&lis3_dev);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800396 return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
397}
398
399static ssize_t lis3lv02d_calibrate_show(struct device *dev,
400 struct device_attribute *attr, char *buf)
401{
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700402 return sprintf(buf, "(%d,%d,%d)\n", lis3_dev.xcalib, lis3_dev.ycalib, lis3_dev.zcalib);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800403}
404
405static ssize_t lis3lv02d_calibrate_store(struct device *dev,
406 struct device_attribute *attr,
407 const char *buf, size_t count)
408{
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700409 lis3lv02d_increase_use(&lis3_dev);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800410 lis3lv02d_calibrate_joystick();
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700411 lis3lv02d_decrease_use(&lis3_dev);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800412 return count;
413}
414
415/* conversion btw sampling rate and the register values */
416static int lis3lv02dl_df_val[4] = {40, 160, 640, 2560};
417static ssize_t lis3lv02d_rate_show(struct device *dev,
418 struct device_attribute *attr, char *buf)
419{
420 u8 ctrl;
421 int val;
422
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700423 lis3lv02d_increase_use(&lis3_dev);
Daniel Macka38da2e2009-03-31 15:24:32 -0700424 lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700425 lis3lv02d_decrease_use(&lis3_dev);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800426 val = (ctrl & (CTRL1_DF0 | CTRL1_DF1)) >> 4;
427 return sprintf(buf, "%d\n", lis3lv02dl_df_val[val]);
428}
429
430static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
431static DEVICE_ATTR(calibrate, S_IRUGO|S_IWUSR, lis3lv02d_calibrate_show,
432 lis3lv02d_calibrate_store);
433static DEVICE_ATTR(rate, S_IRUGO, lis3lv02d_rate_show, NULL);
434
435static struct attribute *lis3lv02d_attributes[] = {
436 &dev_attr_position.attr,
437 &dev_attr_calibrate.attr,
438 &dev_attr_rate.attr,
439 NULL
440};
441
442static struct attribute_group lis3lv02d_attribute_group = {
443 .attrs = lis3lv02d_attributes
444};
445
Eric Pielcfce41a2009-01-09 16:41:01 -0800446
Daniel Macka38da2e2009-03-31 15:24:32 -0700447static int lis3lv02d_add_fs(struct lis3lv02d *lis3)
Pavel Machek455fbdd2008-11-12 13:27:02 -0800448{
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700449 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);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800452
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700453 return sysfs_create_group(&lis3_dev.pdev->dev.kobj, &lis3lv02d_attribute_group);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800454}
455
Eric Pielcfce41a2009-01-09 16:41:01 -0800456int lis3lv02d_remove_fs(void)
Pavel Machek455fbdd2008-11-12 13:27:02 -0800457{
Pavel Machekbe84cfc2009-03-31 15:24:26 -0700458 sysfs_remove_group(&lis3_dev.pdev->dev.kobj, &lis3lv02d_attribute_group);
459 platform_device_unregister(lis3_dev.pdev);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800460 return 0;
461}
Eric Pielcfce41a2009-01-09 16:41:01 -0800462EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
Pavel Machek455fbdd2008-11-12 13:27:02 -0800463
Daniel Mackab337a62009-03-31 15:24:31 -0700464/*
465 * Initialise the accelerometer and the various subsystems.
466 * Should be rather independant of the bus system.
467 */
Daniel Macka38da2e2009-03-31 15:24:32 -0700468int lis3lv02d_init_device(struct lis3lv02d *dev)
Daniel Mackab337a62009-03-31 15:24:31 -0700469{
Daniel Macka38da2e2009-03-31 15:24:32 -0700470 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
Daniel Mackab337a62009-03-31 15:24:31 -0700489 mutex_init(&dev->lock);
Daniel Macka38da2e2009-03-31 15:24:32 -0700490 lis3lv02d_add_fs(dev);
Daniel Mackab337a62009-03-31 15:24:31 -0700491 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
Daniel Macka38da2e2009-03-31 15:24:32 -0700498 /* bail if we did not get an IRQ from the bus layer */
Daniel Mackab337a62009-03-31 15:24:31 -0700499 if (!dev->irq) {
500 printk(KERN_ERR DRIVER_NAME
Daniel Macka38da2e2009-03-31 15:24:32 -0700501 ": No IRQ. Disabling /dev/freefall\n");
Daniel Mackab337a62009-03-31 15:24:31 -0700502 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");
508out:
509 lis3lv02d_decrease_use(dev);
510 return 0;
511}
512EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
513
Pavel Machek455fbdd2008-11-12 13:27:02 -0800514MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
Pavel Machekef2cfc72009-02-18 14:48:23 -0800515MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
Pavel Machek455fbdd2008-11-12 13:27:02 -0800516MODULE_LICENSE("GPL");
517