1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
|
Add interrupt support for the accelerometer. A message is printed in dmesg when an interrupt occurs, but no further handling is done.
From: Nicolas Boichat <nicolas@boichat.ch>
---
drivers/hwmon/applesmc.c | 321 +++++++++++++++++++++++++++++++++++++++++++---
1 files changed, 298 insertions(+), 23 deletions(-)
diff --git a/drivers/hwmon/applesmc.c b/drivers/hwmon/applesmc.c
index 4b90444..56e4a59 100644
--- a/drivers/hwmon/applesmc.c
+++ b/drivers/hwmon/applesmc.c
@@ -39,14 +39,20 @@
#include <linux/leds.h>
#include <linux/hwmon.h>
#include <linux/workqueue.h>
+#include <linux/interrupt.h>
/* data port used by Apple SMC */
#define APPLESMC_DATA_PORT 0x300
/* command/status port used by Apple SMC */
#define APPLESMC_CMD_PORT 0x304
+/* status port used by Apple SMC to get which interrupt type just happened */
+#define APPLESMC_INT_PORT 0x31f
#define APPLESMC_NR_PORTS 32 /* 0x300-0x31f */
+/* Defined in ACPI DSDT table, should we read it from there? */
+#define APPLESMC_IRQ 6
+
#define APPLESMC_MAX_DATA_LENGTH 32
#define APPLESMC_STATUS_MASK 0x0f
@@ -57,6 +63,8 @@
#define KEY_COUNT_KEY "#KEY" /* r-o ui32 */
+#define INTERRUPT_OK_KEY "NTOK" /* w-o ui8 */
+
#define LIGHT_SENSOR_LEFT_KEY "ALV0" /* r-o {alv (6 bytes) */
#define LIGHT_SENSOR_RIGHT_KEY "ALV1" /* r-o {alv (6 bytes) */
#define BACKLIGHT_KEY "LKSB" /* w-o {lkb (2 bytes) */
@@ -68,6 +76,19 @@
#define MOTION_SENSOR_Z_KEY "MO_Z" /* r-o sp78 (2 bytes) */
#define MOTION_SENSOR_KEY "MOCN" /* r/w ui16 */
+/*
+ * Interrupt controls.
+ * If the norm of the position (sqrt(MO_X^2+MO_Y^2+MO_Z^2)) is smaller than
+ * MOLT (free fall), or bigger than MOHT (high acceleration) for longer than the
+ * value of MOLD (or MOHD), SMC will trigger an interrupt.
+ */
+#define MOTION_LOW_NORM "MOLT" /* r/w sp78 (2 bytes) */
+#define MOTION_HIGH_NORM "MOHT" /* r/w sp78 (2 bytes) */
+#define MOTION_LOW_NORM_INTERVAL "MOLD" /* r/w ui8 */
+#define MOTION_HIGH_NORM_INTERVAL "MOHD" /* r/w ui8 */
+
+#define MSDW_KEY "MSDW" /* r/w flag (1 byte) */
+
#define FANS_COUNT "FNum" /* r-o ui8 */
#define FANS_MANUAL "FS! " /* r-w ui16 */
#define FAN_ACTUAL_SPEED "F0Ac" /* r-o fpe2 (2 bytes) */
@@ -357,12 +378,83 @@ static int applesmc_read_motion_sensor(int index, s16* value)
}
/*
+ * applesmc_init_check_key_value - checks if a given key contains the bytes in
+ * buffer, if not, writes these bytes.
+ * In case of failure retry every INIT_WAIT_MSECS msec, and timeout if it
+ * waited more than INIT_TIMEOUT_MSECS in total.
+ * Returns zero on success or a negative error on failure. Callers must
+ * hold applesmc_lock.
+ */
+static int applesmc_init_check_key_value(const char *key, u8 *buffer, u8 len)
+{
+ int total, ret, i, compare;
+ u8 rdbuffer[APPLESMC_MAX_DATA_LENGTH];
+
+ if (len > APPLESMC_MAX_DATA_LENGTH) {
+ printk(KERN_ERR "applesmc_init_check_key_value: cannot "
+ "read/write more than %d bytes",
+ APPLESMC_MAX_DATA_LENGTH);
+ return -EINVAL;
+ }
+
+ for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
+ ret = applesmc_read_key(key, rdbuffer, len);
+ if (!ret) {
+ compare = 1;
+ for (i = 0; i < len; i++) {
+ if (rdbuffer[i] != buffer[i]) {
+ compare = 0;
+ break;
+ }
+ }
+
+ if (compare) {
+ return 0;
+ }
+ }
+ ret = applesmc_write_key(key, buffer, len);
+ msleep(INIT_WAIT_MSECS);
+ }
+
+ if (ret)
+ return ret;
+ else
+ return -EIO;
+}
+
+irqreturn_t applesmc_irq_handler(int irq, void *dev_id)
+{
+ u8 int_type = inb(APPLESMC_INT_PORT);
+
+ switch (int_type) {
+ case 0x60:
+ printk(KERN_INFO "applesmc: received a free fall interrupt\n");
+ break;
+ case 0x6f:
+ printk(KERN_INFO
+ "applesmc: received a high acceleration interrupt\n");
+ break;
+ case 0x80:
+ printk(KERN_INFO "applesmc: received a shock interrupt\n");
+ break;
+ default:
+ printk(KERN_INFO
+ "applesmc: received an unknown interrupt %x\n",
+ int_type);
+ }
+
+ return IRQ_HANDLED;
+}
+
+/*
* applesmc_device_init - initialize the accelerometer. Returns zero on success
* and negative error code on failure. Can sleep.
*/
static int applesmc_device_init(void)
{
- int total, ret = -ENXIO;
+ int total;
+ int ret = -ENXIO;
+ int ret1, ret2;
u8 buffer[2];
if (!applesmc_accelerometer)
@@ -370,32 +462,79 @@ static int applesmc_device_init(void)
mutex_lock(&applesmc_lock);
+ /* Accept interrupts */
+ buffer[0] = 0x01;
for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
- if (debug)
- printk(KERN_DEBUG "applesmc try %d\n", total);
- if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
- (buffer[0] != 0x00 || buffer[1] != 0x00)) {
- if (total == INIT_TIMEOUT_MSECS) {
- printk(KERN_DEBUG "applesmc: device has"
- " already been initialized"
- " (0x%02x, 0x%02x).\n",
- buffer[0], buffer[1]);
- } else {
- printk(KERN_DEBUG "applesmc: device"
- " successfully initialized"
- " (0x%02x, 0x%02x).\n",
- buffer[0], buffer[1]);
- }
- ret = 0;
- goto out;
- }
- buffer[0] = 0xe0;
- buffer[1] = 0x00;
- applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
+ ret1 = applesmc_write_key(INTERRUPT_OK_KEY, buffer, 1);
msleep(INIT_WAIT_MSECS);
+
+ if (!ret1)
+ break;
+ }
+ if (ret1)
+ printk(KERN_WARNING "applesmc: Cannot set NTOK key, "
+ "will not receive interrupts.\n");
+
+ /* Setup interrupt controls. */
+ buffer[0] = 20; /* 20 msecs */
+ ret1 = applesmc_init_check_key_value(MOTION_LOW_NORM_INTERVAL,
+ buffer, 1);
+
+ buffer[0] = 20; /* 20 msecs */
+ ret2 = applesmc_init_check_key_value(MOTION_HIGH_NORM_INTERVAL,
+ buffer, 1);
+
+ if (ret1 || ret2) {
+ printk(KERN_WARNING "applesmc: Cannot set motion sensor "
+ "interrupt interval, might not receive "
+ "some interrupts.");
}
- printk(KERN_WARNING "applesmc: failed to init the device\n");
+ buffer[0] = 0x00;
+ buffer[1] = 0x60;
+ ret1 = applesmc_init_check_key_value(MOTION_LOW_NORM, buffer, 2);
+
+ buffer[0] = 0x01;
+ buffer[1] = 0xc0;
+ ret2 = applesmc_init_check_key_value(MOTION_HIGH_NORM, buffer, 2);
+
+ if (ret1 || ret2) {
+ printk(KERN_WARNING "applesmc: Cannot set motion sensor "
+ "min/max norm parameters, "
+ "might not receive some interrupts.");
+ }
+
+ /* Mysterious key. */
+ buffer[0] = 0x01;
+ for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
+ ret1 = applesmc_write_key(MSDW_KEY, buffer, 1);
+ msleep(INIT_WAIT_MSECS);
+
+ if (!ret1)
+ break;
+ }
+ if (ret1)
+ printk(KERN_WARNING "applesmc: Cannot set MSDW key\n");
+
+ /* Initialize the device. */
+ buffer[0] = 0xe0;
+ buffer[1] = 0xf8;
+ if (applesmc_init_check_key_value(MOTION_SENSOR_KEY, buffer, 2)) {
+ printk(KERN_WARNING "applesmc: failed to init "
+ "the accelerometer\n");
+ goto out;
+ }
+
+ ret1 = request_irq(APPLESMC_IRQ, applesmc_irq_handler, IRQF_DISABLED,
+ "applesmc_irq_handler", NULL);
+
+ if (ret1) {
+ printk(KERN_WARNING "applesmc: cannot setup irq handler\n");
+ }
+
+ printk(KERN_DEBUG "applesmc: accelerometer "
+ "successfully initialized.\n");
+ ret = 0;
out:
mutex_unlock(&applesmc_lock);
@@ -440,9 +579,16 @@ static int applesmc_resume(struct platform_device *dev)
return applesmc_device_init();
}
+static int applesmc_remove(struct platform_device *dev)
+{
+ free_irq(APPLESMC_IRQ, NULL);
+ return 0;
+}
+
static struct platform_driver applesmc_driver = {
.probe = applesmc_probe,
.resume = applesmc_resume,
+ .remove = applesmc_remove,
.driver = {
.name = "applesmc",
.owner = THIS_MODULE,
@@ -904,6 +1050,123 @@ static ssize_t applesmc_key_at_index_store(struct device *dev,
return count;
}
+static ssize_t applesmc_accelerometer_show(struct device *dev,
+ struct device_attribute *attr, char *sysfsbuf)
+{
+ int ret;
+ unsigned int value = 0;
+ u8 buffer[2];
+ char *key;
+ int length;
+ struct sensor_device_attribute_2 *sensor_attr =
+ to_sensor_dev_attr_2(attr);
+
+ switch (sensor_attr->index) {
+ case 0:
+ key = MOTION_LOW_NORM_INTERVAL;
+ length = 1;
+ break;
+ case 1:
+ key = MOTION_HIGH_NORM_INTERVAL;
+ length = 1;
+ break;
+ case 2:
+ key = MOTION_LOW_NORM;
+ length = 2;
+ break;
+ case 3:
+ key = MOTION_HIGH_NORM;
+ length = 2;
+ break;
+ default:
+ printk(KERN_ERR
+ "Invalid index for applesmc_accelerometer_show");
+ return -EINVAL;
+ }
+
+ mutex_lock(&applesmc_lock);
+
+ ret = applesmc_read_key(key, buffer, length);
+ if (length == 2)
+ value = ((unsigned int)buffer[0] << 8) | buffer[1];
+ else if (length == 1)
+ value = buffer[0];
+ else {
+ printk("Invalid length for applesmc_param_show");
+ ret = -EINVAL;
+ }
+
+ mutex_unlock(&applesmc_lock);
+ if (ret)
+ return ret;
+ else
+ return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", value);
+}
+
+static ssize_t applesmc_accelerometer_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *sysfsbuf, size_t count)
+{
+ int ret;
+ u32 value;
+ u8 buffer[2];
+ char *key;
+ int length;
+ struct sensor_device_attribute_2 *sensor_attr =
+ to_sensor_dev_attr_2(attr);
+
+ switch (sensor_attr->index) {
+ case 0:
+ key = MOTION_LOW_NORM_INTERVAL;
+ length = 1;
+ break;
+ case 1:
+ key = MOTION_HIGH_NORM_INTERVAL;
+ length = 1;
+ break;
+ case 2:
+ key = MOTION_LOW_NORM;
+ length = 2;
+ break;
+ case 3:
+ key = MOTION_HIGH_NORM;
+ length = 2;
+ break;
+ default:
+ printk("Invalid index for applesmc_accelerometer_show");
+ return -EINVAL;
+ }
+
+ value = simple_strtoul(sysfsbuf, NULL, 10);
+
+ if (length == 2) {
+ if (value > 0xffff)
+ return -EINVAL;
+
+ buffer[0] = (value >> 8) & 0xff;
+ buffer[1] = value & 0xff;
+ } else if (length == 1) {
+ if (value > 0xff)
+ return -EINVAL;
+
+ buffer[0] = value & 0xff;
+ } else {
+ printk("Invalid length for applesmc_param_store");
+ return -EINVAL;
+ }
+
+ mutex_lock(&applesmc_lock);
+
+ ret = applesmc_write_key(key, buffer, length);
+
+ mutex_unlock(&applesmc_lock);
+
+ if (ret)
+ return ret;
+ else
+ return count;
+}
+
static struct led_classdev applesmc_backlight = {
.name = "smc:kbd_backlight",
.default_trigger = "nand-disk",
@@ -915,10 +1178,22 @@ static DEVICE_ATTR(name, 0444, applesmc_name_show, NULL);
static DEVICE_ATTR(position, 0444, applesmc_position_show, NULL);
static DEVICE_ATTR(calibrate, 0644,
applesmc_calibrate_show, applesmc_calibrate_store);
+static SENSOR_DEVICE_ATTR(low_norm_trigger_interval, 0644,
+ applesmc_accelerometer_show, applesmc_accelerometer_store, 0);
+static SENSOR_DEVICE_ATTR(high_norm_trigger_interval, 0644,
+ applesmc_accelerometer_show, applesmc_accelerometer_store, 1);
+static SENSOR_DEVICE_ATTR(low_norm_trigger, 0644,
+ applesmc_accelerometer_show, applesmc_accelerometer_store, 2);
+static SENSOR_DEVICE_ATTR(high_norm_trigger, 0644,
+ applesmc_accelerometer_show, applesmc_accelerometer_store, 3);
static struct attribute *accelerometer_attributes[] = {
&dev_attr_position.attr,
&dev_attr_calibrate.attr,
+ &sensor_dev_attr_low_norm_trigger.dev_attr.attr,
+ &sensor_dev_attr_high_norm_trigger.dev_attr.attr,
+ &sensor_dev_attr_low_norm_trigger_interval.dev_attr.attr,
+ &sensor_dev_attr_high_norm_trigger_interval.dev_attr.attr,
NULL
};
|