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-rw-r--r--drivers/hwmon/lis3lv02d.c581
1 files changed, 581 insertions, 0 deletions
diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c
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index 000000000000..c002144c76bc
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1/*
2 * lis3lv02d.c - ST LIS3LV02DL accelerometer driver
3 *
4 * Copyright (C) 2007-2008 Yan Burman
5 * Copyright (C) 2008 Eric Piel
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22#include <linux/kernel.h>
23#include <linux/init.h>
24#include <linux/dmi.h>
25#include <linux/module.h>
26#include <linux/types.h>
27#include <linux/platform_device.h>
28#include <linux/interrupt.h>
29#include <linux/input.h>
30#include <linux/kthread.h>
31#include <linux/semaphore.h>
32#include <linux/delay.h>
33#include <linux/wait.h>
34#include <linux/poll.h>
35#include <linux/freezer.h>
36#include <linux/uaccess.h>
37#include <acpi/acpi_drivers.h>
38#include <asm/atomic.h>
39#include "lis3lv02d.h"
40
41#define DRIVER_NAME "lis3lv02d"
42#define ACPI_MDPS_CLASS "accelerometer"
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
55/* Maximum value our axis may get for the input device (signed 12 bits) */
56#define MDPS_MAX_VAL 2048
57
58struct axis_conversion {
59 s8 x;
60 s8 y;
61 s8 z;
62};
63
64struct acpi_lis3lv02d {
65 struct acpi_device *device; /* The ACPI device */
66 struct input_dev *idev; /* input device */
67 struct task_struct *kthread; /* kthread for input */
68 struct mutex lock;
69 struct platform_device *pdev; /* platform device */
70 atomic_t count; /* interrupt count after last read */
71 int xcalib; /* calibrated null value for x */
72 int ycalib; /* calibrated null value for y */
73 int zcalib; /* calibrated null value for z */
74 unsigned char is_on; /* whether the device is on or off */
75 unsigned char usage; /* usage counter */
76 struct axis_conversion ac; /* hw -> logical axis */
77};
78
79static struct acpi_lis3lv02d adev;
80
81static int lis3lv02d_remove_fs(void);
82static int lis3lv02d_add_fs(struct acpi_device *device);
83
84/* For automatic insertion of the module */
85static struct acpi_device_id lis3lv02d_device_ids[] = {
86 {"HPQ0004", 0}, /* HP Mobile Data Protection System PNP */
87 {"", 0},
88};
89MODULE_DEVICE_TABLE(acpi, lis3lv02d_device_ids);
90
91/**
92 * lis3lv02d_acpi_init - ACPI _INI method: initialize the device.
93 * @handle: the handle of the device
94 *
95 * Returns AE_OK on success.
96 */
97static inline acpi_status lis3lv02d_acpi_init(acpi_handle handle)
98{
99 return acpi_evaluate_object(handle, METHOD_NAME__INI, NULL, NULL);
100}
101
102/**
103 * lis3lv02d_acpi_read - ACPI ALRD method: read a register
104 * @handle: the handle of the device
105 * @reg: the register to read
106 * @ret: result of the operation
107 *
108 * Returns AE_OK on success.
109 */
110static acpi_status lis3lv02d_acpi_read(acpi_handle handle, int reg, u8 *ret)
111{
112 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
113 struct acpi_object_list args = { 1, &arg0 };
114 unsigned long long lret;
115 acpi_status status;
116
117 arg0.integer.value = reg;
118
119 status = acpi_evaluate_integer(handle, "ALRD", &args, &lret);
120 *ret = lret;
121 return status;
122}
123
124/**
125 * lis3lv02d_acpi_write - ACPI ALWR method: write to a register
126 * @handle: the handle of the device
127 * @reg: the register to write to
128 * @val: the value to write
129 *
130 * Returns AE_OK on success.
131 */
132static acpi_status lis3lv02d_acpi_write(acpi_handle handle, int reg, u8 val)
133{
134 unsigned long long ret; /* Not used when writting */
135 union acpi_object in_obj[2];
136 struct acpi_object_list args = { 2, in_obj };
137
138 in_obj[0].type = ACPI_TYPE_INTEGER;
139 in_obj[0].integer.value = reg;
140 in_obj[1].type = ACPI_TYPE_INTEGER;
141 in_obj[1].integer.value = val;
142
143 return acpi_evaluate_integer(handle, "ALWR", &args, &ret);
144}
145
146static s16 lis3lv02d_read_16(acpi_handle handle, int reg)
147{
148 u8 lo, hi;
149
150 lis3lv02d_acpi_read(handle, reg, &lo);
151 lis3lv02d_acpi_read(handle, reg + 1, &hi);
152 /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */
153 return (s16)((hi << 8) | lo);
154}
155
156/**
157 * lis3lv02d_get_axis - For the given axis, give the value converted
158 * @axis: 1,2,3 - can also be negative
159 * @hw_values: raw values returned by the hardware
160 *
161 * Returns the converted value.
162 */
163static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3])
164{
165 if (axis > 0)
166 return hw_values[axis - 1];
167 else
168 return -hw_values[-axis - 1];
169}
170
171/**
172 * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer
173 * @handle: the handle to the device
174 * @x: where to store the X axis value
175 * @y: where to store the Y axis value
176 * @z: where to store the Z axis value
177 *
178 * Note that 40Hz input device can eat up about 10% CPU at 800MHZ
179 */
180static void lis3lv02d_get_xyz(acpi_handle handle, int *x, int *y, int *z)
181{
182 int position[3];
183
184 position[0] = lis3lv02d_read_16(handle, OUTX_L);
185 position[1] = lis3lv02d_read_16(handle, OUTY_L);
186 position[2] = lis3lv02d_read_16(handle, OUTZ_L);
187
188 *x = lis3lv02d_get_axis(adev.ac.x, position);
189 *y = lis3lv02d_get_axis(adev.ac.y, position);
190 *z = lis3lv02d_get_axis(adev.ac.z, position);
191}
192
193static inline void lis3lv02d_poweroff(acpi_handle handle)
194{
195 adev.is_on = 0;
196 /* disable X,Y,Z axis and power down */
197 lis3lv02d_acpi_write(handle, CTRL_REG1, 0x00);
198}
199
200static void lis3lv02d_poweron(acpi_handle handle)
201{
202 u8 val;
203
204 adev.is_on = 1;
205 lis3lv02d_acpi_init(handle);
206 lis3lv02d_acpi_write(handle, FF_WU_CFG, 0);
207 /*
208 * BDU: LSB and MSB values are not updated until both have been read.
209 * So the value read will always be correct.
210 * IEN: Interrupt for free-fall and DD, not for data-ready.
211 */
212 lis3lv02d_acpi_read(handle, CTRL_REG2, &val);
213 val |= CTRL2_BDU | CTRL2_IEN;
214 lis3lv02d_acpi_write(handle, CTRL_REG2, val);
215}
216
217#ifdef CONFIG_PM
218static int lis3lv02d_suspend(struct acpi_device *device, pm_message_t state)
219{
220 /* make sure the device is off when we suspend */
221 lis3lv02d_poweroff(device->handle);
222 return 0;
223}
224
225static int lis3lv02d_resume(struct acpi_device *device)
226{
227 /* put back the device in the right state (ACPI might turn it on) */
228 mutex_lock(&adev.lock);
229 if (adev.usage > 0)
230 lis3lv02d_poweron(device->handle);
231 else
232 lis3lv02d_poweroff(device->handle);
233 mutex_unlock(&adev.lock);
234 return 0;
235}
236#else
237#define lis3lv02d_suspend NULL
238#define lis3lv02d_resume NULL
239#endif
240
241
242/*
243 * To be called before starting to use the device. It makes sure that the
244 * device will always be on until a call to lis3lv02d_decrease_use(). Not to be
245 * used from interrupt context.
246 */
247static void lis3lv02d_increase_use(struct acpi_lis3lv02d *dev)
248{
249 mutex_lock(&dev->lock);
250 dev->usage++;
251 if (dev->usage == 1) {
252 if (!dev->is_on)
253 lis3lv02d_poweron(dev->device->handle);
254 }
255 mutex_unlock(&dev->lock);
256}
257
258/*
259 * To be called whenever a usage of the device is stopped.
260 * It will make sure to turn off the device when there is not usage.
261 */
262static void lis3lv02d_decrease_use(struct acpi_lis3lv02d *dev)
263{
264 mutex_lock(&dev->lock);
265 dev->usage--;
266 if (dev->usage == 0)
267 lis3lv02d_poweroff(dev->device->handle);
268 mutex_unlock(&dev->lock);
269}
270
271/**
272 * lis3lv02d_joystick_kthread - Kthread polling function
273 * @data: unused - here to conform to threadfn prototype
274 */
275static int lis3lv02d_joystick_kthread(void *data)
276{
277 int x, y, z;
278
279 while (!kthread_should_stop()) {
280 lis3lv02d_get_xyz(adev.device->handle, &x, &y, &z);
281 input_report_abs(adev.idev, ABS_X, x - adev.xcalib);
282 input_report_abs(adev.idev, ABS_Y, y - adev.ycalib);
283 input_report_abs(adev.idev, ABS_Z, z - adev.zcalib);
284
285 input_sync(adev.idev);
286
287 try_to_freeze();
288 msleep_interruptible(MDPS_POLL_INTERVAL);
289 }
290
291 return 0;
292}
293
294static int lis3lv02d_joystick_open(struct input_dev *input)
295{
296 lis3lv02d_increase_use(&adev);
297 adev.kthread = kthread_run(lis3lv02d_joystick_kthread, NULL, "klis3lv02d");
298 if (IS_ERR(adev.kthread)) {
299 lis3lv02d_decrease_use(&adev);
300 return PTR_ERR(adev.kthread);
301 }
302
303 return 0;
304}
305
306static void lis3lv02d_joystick_close(struct input_dev *input)
307{
308 kthread_stop(adev.kthread);
309 lis3lv02d_decrease_use(&adev);
310}
311
312
313static inline void lis3lv02d_calibrate_joystick(void)
314{
315 lis3lv02d_get_xyz(adev.device->handle, &adev.xcalib, &adev.ycalib, &adev.zcalib);
316}
317
318static int lis3lv02d_joystick_enable(void)
319{
320 int err;
321
322 if (adev.idev)
323 return -EINVAL;
324
325 adev.idev = input_allocate_device();
326 if (!adev.idev)
327 return -ENOMEM;
328
329 lis3lv02d_calibrate_joystick();
330
331 adev.idev->name = "ST LIS3LV02DL Accelerometer";
332 adev.idev->phys = DRIVER_NAME "/input0";
333 adev.idev->id.bustype = BUS_HOST;
334 adev.idev->id.vendor = 0;
335 adev.idev->dev.parent = &adev.pdev->dev;
336 adev.idev->open = lis3lv02d_joystick_open;
337 adev.idev->close = lis3lv02d_joystick_close;
338
339 set_bit(EV_ABS, adev.idev->evbit);
340 input_set_abs_params(adev.idev, ABS_X, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
341 input_set_abs_params(adev.idev, ABS_Y, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
342 input_set_abs_params(adev.idev, ABS_Z, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3);
343
344 err = input_register_device(adev.idev);
345 if (err) {
346 input_free_device(adev.idev);
347 adev.idev = NULL;
348 }
349
350 return err;
351}
352
353static void lis3lv02d_joystick_disable(void)
354{
355 if (!adev.idev)
356 return;
357
358 input_unregister_device(adev.idev);
359 adev.idev = NULL;
360}
361
362
363/*
364 * Initialise the accelerometer and the various subsystems.
365 * Should be rather independant of the bus system.
366 */
367static int lis3lv02d_init_device(struct acpi_lis3lv02d *dev)
368{
369 mutex_init(&dev->lock);
370 lis3lv02d_add_fs(dev->device);
371 lis3lv02d_increase_use(dev);
372
373 if (lis3lv02d_joystick_enable())
374 printk(KERN_ERR DRIVER_NAME ": joystick initialization failed\n");
375
376 lis3lv02d_decrease_use(dev);
377 return 0;
378}
379
380static int lis3lv02d_dmi_matched(const struct dmi_system_id *dmi)
381{
382 adev.ac = *((struct axis_conversion *)dmi->driver_data);
383 printk(KERN_INFO DRIVER_NAME ": hardware type %s found.\n", dmi->ident);
384
385 return 1;
386}
387
388/* Represents, for each axis seen by userspace, the corresponding hw axis (+1).
389 * If the value is negative, the opposite of the hw value is used. */
390static struct axis_conversion lis3lv02d_axis_normal = {1, 2, 3};
391static struct axis_conversion lis3lv02d_axis_y_inverted = {1, -2, 3};
392static struct axis_conversion lis3lv02d_axis_x_inverted = {-1, 2, 3};
393static struct axis_conversion lis3lv02d_axis_z_inverted = {1, 2, -3};
394static struct axis_conversion lis3lv02d_axis_xy_rotated_left = {-2, 1, 3};
395static struct axis_conversion lis3lv02d_axis_xy_swap_inverted = {-2, -1, 3};
396
397#define AXIS_DMI_MATCH(_ident, _name, _axis) { \
398 .ident = _ident, \
399 .callback = lis3lv02d_dmi_matched, \
400 .matches = { \
401 DMI_MATCH(DMI_PRODUCT_NAME, _name) \
402 }, \
403 .driver_data = &lis3lv02d_axis_##_axis \
404}
405static struct dmi_system_id lis3lv02d_dmi_ids[] = {
406 /* product names are truncated to match all kinds of a same model */
407 AXIS_DMI_MATCH("NC64x0", "HP Compaq nc64", x_inverted),
408 AXIS_DMI_MATCH("NC84x0", "HP Compaq nc84", z_inverted),
409 AXIS_DMI_MATCH("NX9420", "HP Compaq nx9420", x_inverted),
410 AXIS_DMI_MATCH("NW9440", "HP Compaq nw9440", x_inverted),
411 AXIS_DMI_MATCH("NC2510", "HP Compaq 2510", y_inverted),
412 AXIS_DMI_MATCH("NC8510", "HP Compaq 8510", xy_swap_inverted),
413 AXIS_DMI_MATCH("HP2133", "HP 2133", xy_rotated_left),
414 { NULL, }
415/* Laptop models without axis info (yet):
416 * "NC651xx" "HP Compaq 651"
417 * "NC671xx" "HP Compaq 671"
418 * "NC6910" "HP Compaq 6910"
419 * HP Compaq 8710x Notebook PC / Mobile Workstation
420 * "NC2400" "HP Compaq nc2400"
421 * "NX74x0" "HP Compaq nx74"
422 * "NX6325" "HP Compaq nx6325"
423 * "NC4400" "HP Compaq nc4400"
424 */
425};
426
427static int lis3lv02d_add(struct acpi_device *device)
428{
429 u8 val;
430
431 if (!device)
432 return -EINVAL;
433
434 adev.device = device;
435 strcpy(acpi_device_name(device), DRIVER_NAME);
436 strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
437 device->driver_data = &adev;
438
439 lis3lv02d_acpi_read(device->handle, WHO_AM_I, &val);
440 if ((val != LIS3LV02DL_ID) && (val != LIS302DL_ID)) {
441 printk(KERN_ERR DRIVER_NAME
442 ": Accelerometer chip not LIS3LV02D{L,Q}\n");
443 }
444
445 /* If possible use a "standard" axes order */
446 if (dmi_check_system(lis3lv02d_dmi_ids) == 0) {
447 printk(KERN_INFO DRIVER_NAME ": laptop model unknown, "
448 "using default axes configuration\n");
449 adev.ac = lis3lv02d_axis_normal;
450 }
451
452 return lis3lv02d_init_device(&adev);
453}
454
455static int lis3lv02d_remove(struct acpi_device *device, int type)
456{
457 if (!device)
458 return -EINVAL;
459
460 lis3lv02d_joystick_disable();
461 lis3lv02d_poweroff(device->handle);
462
463 return lis3lv02d_remove_fs();
464}
465
466
467/* Sysfs stuff */
468static ssize_t lis3lv02d_position_show(struct device *dev,
469 struct device_attribute *attr, char *buf)
470{
471 int x, y, z;
472
473 lis3lv02d_increase_use(&adev);
474 lis3lv02d_get_xyz(adev.device->handle, &x, &y, &z);
475 lis3lv02d_decrease_use(&adev);
476 return sprintf(buf, "(%d,%d,%d)\n", x, y, z);
477}
478
479static ssize_t lis3lv02d_calibrate_show(struct device *dev,
480 struct device_attribute *attr, char *buf)
481{
482 return sprintf(buf, "(%d,%d,%d)\n", adev.xcalib, adev.ycalib, adev.zcalib);
483}
484
485static ssize_t lis3lv02d_calibrate_store(struct device *dev,
486 struct device_attribute *attr,
487 const char *buf, size_t count)
488{
489 lis3lv02d_increase_use(&adev);
490 lis3lv02d_calibrate_joystick();
491 lis3lv02d_decrease_use(&adev);
492 return count;
493}
494
495/* conversion btw sampling rate and the register values */
496static int lis3lv02dl_df_val[4] = {40, 160, 640, 2560};
497static ssize_t lis3lv02d_rate_show(struct device *dev,
498 struct device_attribute *attr, char *buf)
499{
500 u8 ctrl;
501 int val;
502
503 lis3lv02d_increase_use(&adev);
504 lis3lv02d_acpi_read(adev.device->handle, CTRL_REG1, &ctrl);
505 lis3lv02d_decrease_use(&adev);
506 val = (ctrl & (CTRL1_DF0 | CTRL1_DF1)) >> 4;
507 return sprintf(buf, "%d\n", lis3lv02dl_df_val[val]);
508}
509
510static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
511static DEVICE_ATTR(calibrate, S_IRUGO|S_IWUSR, lis3lv02d_calibrate_show,
512 lis3lv02d_calibrate_store);
513static DEVICE_ATTR(rate, S_IRUGO, lis3lv02d_rate_show, NULL);
514
515static struct attribute *lis3lv02d_attributes[] = {
516 &dev_attr_position.attr,
517 &dev_attr_calibrate.attr,
518 &dev_attr_rate.attr,
519 NULL
520};
521
522static struct attribute_group lis3lv02d_attribute_group = {
523 .attrs = lis3lv02d_attributes
524};
525
526static int lis3lv02d_add_fs(struct acpi_device *device)
527{
528 adev.pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0);
529 if (IS_ERR(adev.pdev))
530 return PTR_ERR(adev.pdev);
531
532 return sysfs_create_group(&adev.pdev->dev.kobj, &lis3lv02d_attribute_group);
533}
534
535static int lis3lv02d_remove_fs(void)
536{
537 sysfs_remove_group(&adev.pdev->dev.kobj, &lis3lv02d_attribute_group);
538 platform_device_unregister(adev.pdev);
539 return 0;
540}
541
542/* For the HP MDPS aka 3D Driveguard */
543static struct acpi_driver lis3lv02d_driver = {
544 .name = DRIVER_NAME,
545 .class = ACPI_MDPS_CLASS,
546 .ids = lis3lv02d_device_ids,
547 .ops = {
548 .add = lis3lv02d_add,
549 .remove = lis3lv02d_remove,
550 .suspend = lis3lv02d_suspend,
551 .resume = lis3lv02d_resume,
552 }
553};
554
555static int __init lis3lv02d_init_module(void)
556{
557 int ret;
558
559 if (acpi_disabled)
560 return -ENODEV;
561
562 ret = acpi_bus_register_driver(&lis3lv02d_driver);
563 if (ret < 0)
564 return ret;
565
566 printk(KERN_INFO DRIVER_NAME " driver loaded.\n");
567
568 return 0;
569}
570
571static void __exit lis3lv02d_exit_module(void)
572{
573 acpi_bus_unregister_driver(&lis3lv02d_driver);
574}
575
576MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
577MODULE_AUTHOR("Yan Burman and Eric Piel");
578MODULE_LICENSE("GPL");
579
580module_init(lis3lv02d_init_module);
581module_exit(lis3lv02d_exit_module);