Commit | Line | Data |
---|---|---|
455fbdd3 PM |
1 | /* |
2 | * lis3lv02d.c - ST LIS3LV02DL accelerometer driver | |
3 | * | |
4 | * Copyright (C) 2007-2008 Yan Burman | |
5 | * Copyright (C) 2008 Eric Piel | |
cfce41a6 | 6 | * Copyright (C) 2008 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 PM |
37 | #include <linux/uaccess.h> |
38 | #include <acpi/acpi_drivers.h> | |
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 | ||
55 | /* Maximum value our axis may get for the input device (signed 12 bits) */ | |
56 | #define MDPS_MAX_VAL 2048 | |
57 | ||
cfce41a6 EP |
58 | struct acpi_lis3lv02d adev; |
59 | EXPORT_SYMBOL_GPL(adev); | |
455fbdd3 | 60 | |
455fbdd3 PM |
61 | static int lis3lv02d_add_fs(struct acpi_device *device); |
62 | ||
455fbdd3 PM |
63 | static s16 lis3lv02d_read_16(acpi_handle handle, int reg) |
64 | { | |
65 | u8 lo, hi; | |
66 | ||
cfce41a6 EP |
67 | adev.read(handle, reg, &lo); |
68 | adev.read(handle, reg + 1, &hi); | |
455fbdd3 PM |
69 | /* In "12 bit right justified" mode, bit 6, bit 7, bit 8 = bit 5 */ |
70 | return (s16)((hi << 8) | lo); | |
71 | } | |
72 | ||
73 | /** | |
74 | * lis3lv02d_get_axis - For the given axis, give the value converted | |
75 | * @axis: 1,2,3 - can also be negative | |
76 | * @hw_values: raw values returned by the hardware | |
77 | * | |
78 | * Returns the converted value. | |
79 | */ | |
80 | static inline int lis3lv02d_get_axis(s8 axis, int hw_values[3]) | |
81 | { | |
82 | if (axis > 0) | |
83 | return hw_values[axis - 1]; | |
84 | else | |
85 | return -hw_values[-axis - 1]; | |
86 | } | |
87 | ||
88 | /** | |
89 | * lis3lv02d_get_xyz - Get X, Y and Z axis values from the accelerometer | |
90 | * @handle: the handle to the device | |
91 | * @x: where to store the X axis value | |
92 | * @y: where to store the Y axis value | |
93 | * @z: where to store the Z axis value | |
94 | * | |
95 | * Note that 40Hz input device can eat up about 10% CPU at 800MHZ | |
96 | */ | |
97 | static void lis3lv02d_get_xyz(acpi_handle handle, int *x, int *y, int *z) | |
98 | { | |
99 | int position[3]; | |
100 | ||
101 | position[0] = lis3lv02d_read_16(handle, OUTX_L); | |
102 | position[1] = lis3lv02d_read_16(handle, OUTY_L); | |
103 | position[2] = lis3lv02d_read_16(handle, OUTZ_L); | |
104 | ||
105 | *x = lis3lv02d_get_axis(adev.ac.x, position); | |
106 | *y = lis3lv02d_get_axis(adev.ac.y, position); | |
107 | *z = lis3lv02d_get_axis(adev.ac.z, position); | |
108 | } | |
109 | ||
cfce41a6 | 110 | void lis3lv02d_poweroff(acpi_handle handle) |
455fbdd3 PM |
111 | { |
112 | adev.is_on = 0; | |
113 | /* disable X,Y,Z axis and power down */ | |
cfce41a6 | 114 | adev.write(handle, CTRL_REG1, 0x00); |
455fbdd3 | 115 | } |
cfce41a6 | 116 | EXPORT_SYMBOL_GPL(lis3lv02d_poweroff); |
455fbdd3 | 117 | |
cfce41a6 | 118 | void lis3lv02d_poweron(acpi_handle handle) |
455fbdd3 PM |
119 | { |
120 | u8 val; | |
121 | ||
122 | adev.is_on = 1; | |
cfce41a6 EP |
123 | adev.init(handle); |
124 | adev.write(handle, FF_WU_CFG, 0); | |
455fbdd3 PM |
125 | /* |
126 | * BDU: LSB and MSB values are not updated until both have been read. | |
127 | * So the value read will always be correct. | |
128 | * IEN: Interrupt for free-fall and DD, not for data-ready. | |
129 | */ | |
cfce41a6 | 130 | adev.read(handle, CTRL_REG2, &val); |
455fbdd3 | 131 | val |= CTRL2_BDU | CTRL2_IEN; |
cfce41a6 | 132 | adev.write(handle, CTRL_REG2, val); |
455fbdd3 | 133 | } |
cfce41a6 | 134 | EXPORT_SYMBOL_GPL(lis3lv02d_poweron); |
455fbdd3 PM |
135 | |
136 | /* | |
137 | * To be called before starting to use the device. It makes sure that the | |
138 | * device will always be on until a call to lis3lv02d_decrease_use(). Not to be | |
139 | * used from interrupt context. | |
140 | */ | |
141 | static void lis3lv02d_increase_use(struct acpi_lis3lv02d *dev) | |
142 | { | |
143 | mutex_lock(&dev->lock); | |
144 | dev->usage++; | |
145 | if (dev->usage == 1) { | |
146 | if (!dev->is_on) | |
147 | lis3lv02d_poweron(dev->device->handle); | |
148 | } | |
149 | mutex_unlock(&dev->lock); | |
150 | } | |
151 | ||
152 | /* | |
153 | * To be called whenever a usage of the device is stopped. | |
154 | * It will make sure to turn off the device when there is not usage. | |
155 | */ | |
156 | static void lis3lv02d_decrease_use(struct acpi_lis3lv02d *dev) | |
157 | { | |
158 | mutex_lock(&dev->lock); | |
159 | dev->usage--; | |
160 | if (dev->usage == 0) | |
161 | lis3lv02d_poweroff(dev->device->handle); | |
162 | mutex_unlock(&dev->lock); | |
163 | } | |
164 | ||
165 | /** | |
166 | * lis3lv02d_joystick_kthread - Kthread polling function | |
167 | * @data: unused - here to conform to threadfn prototype | |
168 | */ | |
169 | static int lis3lv02d_joystick_kthread(void *data) | |
170 | { | |
171 | int x, y, z; | |
172 | ||
173 | while (!kthread_should_stop()) { | |
174 | lis3lv02d_get_xyz(adev.device->handle, &x, &y, &z); | |
175 | input_report_abs(adev.idev, ABS_X, x - adev.xcalib); | |
176 | input_report_abs(adev.idev, ABS_Y, y - adev.ycalib); | |
177 | input_report_abs(adev.idev, ABS_Z, z - adev.zcalib); | |
178 | ||
179 | input_sync(adev.idev); | |
180 | ||
181 | try_to_freeze(); | |
182 | msleep_interruptible(MDPS_POLL_INTERVAL); | |
183 | } | |
184 | ||
185 | return 0; | |
186 | } | |
187 | ||
188 | static int lis3lv02d_joystick_open(struct input_dev *input) | |
189 | { | |
190 | lis3lv02d_increase_use(&adev); | |
191 | adev.kthread = kthread_run(lis3lv02d_joystick_kthread, NULL, "klis3lv02d"); | |
192 | if (IS_ERR(adev.kthread)) { | |
193 | lis3lv02d_decrease_use(&adev); | |
194 | return PTR_ERR(adev.kthread); | |
195 | } | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | static void lis3lv02d_joystick_close(struct input_dev *input) | |
201 | { | |
202 | kthread_stop(adev.kthread); | |
203 | lis3lv02d_decrease_use(&adev); | |
204 | } | |
205 | ||
206 | ||
207 | static inline void lis3lv02d_calibrate_joystick(void) | |
208 | { | |
209 | lis3lv02d_get_xyz(adev.device->handle, &adev.xcalib, &adev.ycalib, &adev.zcalib); | |
210 | } | |
211 | ||
cfce41a6 | 212 | int lis3lv02d_joystick_enable(void) |
455fbdd3 PM |
213 | { |
214 | int err; | |
215 | ||
216 | if (adev.idev) | |
217 | return -EINVAL; | |
218 | ||
219 | adev.idev = input_allocate_device(); | |
220 | if (!adev.idev) | |
221 | return -ENOMEM; | |
222 | ||
223 | lis3lv02d_calibrate_joystick(); | |
224 | ||
225 | adev.idev->name = "ST LIS3LV02DL Accelerometer"; | |
226 | adev.idev->phys = DRIVER_NAME "/input0"; | |
227 | adev.idev->id.bustype = BUS_HOST; | |
228 | adev.idev->id.vendor = 0; | |
229 | adev.idev->dev.parent = &adev.pdev->dev; | |
230 | adev.idev->open = lis3lv02d_joystick_open; | |
231 | adev.idev->close = lis3lv02d_joystick_close; | |
232 | ||
233 | set_bit(EV_ABS, adev.idev->evbit); | |
234 | input_set_abs_params(adev.idev, ABS_X, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3); | |
235 | input_set_abs_params(adev.idev, ABS_Y, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3); | |
236 | input_set_abs_params(adev.idev, ABS_Z, -MDPS_MAX_VAL, MDPS_MAX_VAL, 3, 3); | |
237 | ||
238 | err = input_register_device(adev.idev); | |
239 | if (err) { | |
240 | input_free_device(adev.idev); | |
241 | adev.idev = NULL; | |
242 | } | |
243 | ||
244 | return err; | |
245 | } | |
cfce41a6 | 246 | EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable); |
455fbdd3 | 247 | |
cfce41a6 | 248 | void lis3lv02d_joystick_disable(void) |
455fbdd3 PM |
249 | { |
250 | if (!adev.idev) | |
251 | return; | |
252 | ||
253 | input_unregister_device(adev.idev); | |
254 | adev.idev = NULL; | |
255 | } | |
cfce41a6 | 256 | EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable); |
455fbdd3 PM |
257 | |
258 | /* | |
259 | * Initialise the accelerometer and the various subsystems. | |
260 | * Should be rather independant of the bus system. | |
261 | */ | |
cfce41a6 | 262 | int lis3lv02d_init_device(struct acpi_lis3lv02d *dev) |
455fbdd3 PM |
263 | { |
264 | mutex_init(&dev->lock); | |
265 | lis3lv02d_add_fs(dev->device); | |
266 | lis3lv02d_increase_use(dev); | |
267 | ||
268 | if (lis3lv02d_joystick_enable()) | |
269 | printk(KERN_ERR DRIVER_NAME ": joystick initialization failed\n"); | |
270 | ||
271 | lis3lv02d_decrease_use(dev); | |
272 | return 0; | |
273 | } | |
cfce41a6 | 274 | EXPORT_SYMBOL_GPL(lis3lv02d_init_device); |
455fbdd3 PM |
275 | |
276 | /* Sysfs stuff */ | |
277 | static ssize_t lis3lv02d_position_show(struct device *dev, | |
278 | struct device_attribute *attr, char *buf) | |
279 | { | |
280 | int x, y, z; | |
281 | ||
282 | lis3lv02d_increase_use(&adev); | |
283 | lis3lv02d_get_xyz(adev.device->handle, &x, &y, &z); | |
284 | lis3lv02d_decrease_use(&adev); | |
285 | return sprintf(buf, "(%d,%d,%d)\n", x, y, z); | |
286 | } | |
287 | ||
288 | static ssize_t lis3lv02d_calibrate_show(struct device *dev, | |
289 | struct device_attribute *attr, char *buf) | |
290 | { | |
291 | return sprintf(buf, "(%d,%d,%d)\n", adev.xcalib, adev.ycalib, adev.zcalib); | |
292 | } | |
293 | ||
294 | static ssize_t lis3lv02d_calibrate_store(struct device *dev, | |
295 | struct device_attribute *attr, | |
296 | const char *buf, size_t count) | |
297 | { | |
298 | lis3lv02d_increase_use(&adev); | |
299 | lis3lv02d_calibrate_joystick(); | |
300 | lis3lv02d_decrease_use(&adev); | |
301 | return count; | |
302 | } | |
303 | ||
304 | /* conversion btw sampling rate and the register values */ | |
305 | static int lis3lv02dl_df_val[4] = {40, 160, 640, 2560}; | |
306 | static ssize_t lis3lv02d_rate_show(struct device *dev, | |
307 | struct device_attribute *attr, char *buf) | |
308 | { | |
309 | u8 ctrl; | |
310 | int val; | |
311 | ||
312 | lis3lv02d_increase_use(&adev); | |
cfce41a6 | 313 | adev.read(adev.device->handle, CTRL_REG1, &ctrl); |
455fbdd3 PM |
314 | lis3lv02d_decrease_use(&adev); |
315 | val = (ctrl & (CTRL1_DF0 | CTRL1_DF1)) >> 4; | |
316 | return sprintf(buf, "%d\n", lis3lv02dl_df_val[val]); | |
317 | } | |
318 | ||
319 | static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL); | |
320 | static DEVICE_ATTR(calibrate, S_IRUGO|S_IWUSR, lis3lv02d_calibrate_show, | |
321 | lis3lv02d_calibrate_store); | |
322 | static DEVICE_ATTR(rate, S_IRUGO, lis3lv02d_rate_show, NULL); | |
323 | ||
324 | static struct attribute *lis3lv02d_attributes[] = { | |
325 | &dev_attr_position.attr, | |
326 | &dev_attr_calibrate.attr, | |
327 | &dev_attr_rate.attr, | |
328 | NULL | |
329 | }; | |
330 | ||
331 | static struct attribute_group lis3lv02d_attribute_group = { | |
332 | .attrs = lis3lv02d_attributes | |
333 | }; | |
334 | ||
cfce41a6 | 335 | |
455fbdd3 PM |
336 | static int lis3lv02d_add_fs(struct acpi_device *device) |
337 | { | |
338 | adev.pdev = platform_device_register_simple(DRIVER_NAME, -1, NULL, 0); | |
339 | if (IS_ERR(adev.pdev)) | |
340 | return PTR_ERR(adev.pdev); | |
341 | ||
342 | return sysfs_create_group(&adev.pdev->dev.kobj, &lis3lv02d_attribute_group); | |
343 | } | |
344 | ||
cfce41a6 | 345 | int lis3lv02d_remove_fs(void) |
455fbdd3 PM |
346 | { |
347 | sysfs_remove_group(&adev.pdev->dev.kobj, &lis3lv02d_attribute_group); | |
348 | platform_device_unregister(adev.pdev); | |
349 | return 0; | |
350 | } | |
cfce41a6 | 351 | EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs); |
455fbdd3 PM |
352 | |
353 | MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver"); | |
354 | MODULE_AUTHOR("Yan Burman and Eric Piel"); | |
355 | MODULE_LICENSE("GPL"); | |
356 |