Root/drivers/macintosh/windfarm_smu_sat.c

1/*
2 * Windfarm PowerMac thermal control. SMU "satellite" controller sensors.
3 *
4 * Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org>
5 *
6 * Released under the terms of the GNU GPL v2.
7 */
8
9#include <linux/types.h>
10#include <linux/errno.h>
11#include <linux/kernel.h>
12#include <linux/slab.h>
13#include <linux/init.h>
14#include <linux/wait.h>
15#include <linux/i2c.h>
16#include <linux/mutex.h>
17#include <asm/prom.h>
18#include <asm/smu.h>
19#include <asm/pmac_low_i2c.h>
20
21#include "windfarm.h"
22
23#define VERSION "1.0"
24
25#define DEBUG
26
27#ifdef DEBUG
28#define DBG(args...) printk(args)
29#else
30#define DBG(args...) do { } while(0)
31#endif
32
33/* If the cache is older than 800ms we'll refetch it */
34#define MAX_AGE msecs_to_jiffies(800)
35
36struct wf_sat {
37    struct kref ref;
38    int nr;
39    struct mutex mutex;
40    unsigned long last_read; /* jiffies when cache last updated */
41    u8 cache[16];
42    struct list_head sensors;
43    struct i2c_client *i2c;
44    struct device_node *node;
45};
46
47static struct wf_sat *sats[2];
48
49struct wf_sat_sensor {
50    struct list_head link;
51    int index;
52    int index2; /* used for power sensors */
53    int shift;
54    struct wf_sat *sat;
55    struct wf_sensor sens;
56};
57
58#define wf_to_sat(c) container_of(c, struct wf_sat_sensor, sens)
59
60struct smu_sdbp_header *smu_sat_get_sdb_partition(unsigned int sat_id, int id,
61                          unsigned int *size)
62{
63    struct wf_sat *sat;
64    int err;
65    unsigned int i, len;
66    u8 *buf;
67    u8 data[4];
68
69    /* TODO: Add the resulting partition to the device-tree */
70
71    if (sat_id > 1 || (sat = sats[sat_id]) == NULL)
72        return NULL;
73
74    err = i2c_smbus_write_word_data(sat->i2c, 8, id << 8);
75    if (err) {
76        printk(KERN_ERR "smu_sat_get_sdb_part wr error %d\n", err);
77        return NULL;
78    }
79
80    err = i2c_smbus_read_word_data(sat->i2c, 9);
81    if (err < 0) {
82        printk(KERN_ERR "smu_sat_get_sdb_part rd len error\n");
83        return NULL;
84    }
85    len = err;
86    if (len == 0) {
87        printk(KERN_ERR "smu_sat_get_sdb_part no partition %x\n", id);
88        return NULL;
89    }
90
91    len = le16_to_cpu(len);
92    len = (len + 3) & ~3;
93    buf = kmalloc(len, GFP_KERNEL);
94    if (buf == NULL)
95        return NULL;
96
97    for (i = 0; i < len; i += 4) {
98        err = i2c_smbus_read_i2c_block_data(sat->i2c, 0xa, 4, data);
99        if (err < 0) {
100            printk(KERN_ERR "smu_sat_get_sdb_part rd err %d\n",
101                   err);
102            goto fail;
103        }
104        buf[i] = data[1];
105        buf[i+1] = data[0];
106        buf[i+2] = data[3];
107        buf[i+3] = data[2];
108    }
109#ifdef DEBUG
110    DBG(KERN_DEBUG "sat %d partition %x:", sat_id, id);
111    for (i = 0; i < len; ++i)
112        DBG(" %x", buf[i]);
113    DBG("\n");
114#endif
115
116    if (size)
117        *size = len;
118    return (struct smu_sdbp_header *) buf;
119
120 fail:
121    kfree(buf);
122    return NULL;
123}
124EXPORT_SYMBOL_GPL(smu_sat_get_sdb_partition);
125
126/* refresh the cache */
127static int wf_sat_read_cache(struct wf_sat *sat)
128{
129    int err;
130
131    err = i2c_smbus_read_i2c_block_data(sat->i2c, 0x3f, 16, sat->cache);
132    if (err < 0)
133        return err;
134    sat->last_read = jiffies;
135#ifdef LOTSA_DEBUG
136    {
137        int i;
138        DBG(KERN_DEBUG "wf_sat_get: data is");
139        for (i = 0; i < 16; ++i)
140            DBG(" %.2x", sat->cache[i]);
141        DBG("\n");
142    }
143#endif
144    return 0;
145}
146
147static int wf_sat_sensor_get(struct wf_sensor *sr, s32 *value)
148{
149    struct wf_sat_sensor *sens = wf_to_sat(sr);
150    struct wf_sat *sat = sens->sat;
151    int i, err;
152    s32 val;
153
154    if (sat->i2c == NULL)
155        return -ENODEV;
156
157    mutex_lock(&sat->mutex);
158    if (time_after(jiffies, (sat->last_read + MAX_AGE))) {
159        err = wf_sat_read_cache(sat);
160        if (err)
161            goto fail;
162    }
163
164    i = sens->index * 2;
165    val = ((sat->cache[i] << 8) + sat->cache[i+1]) << sens->shift;
166    if (sens->index2 >= 0) {
167        i = sens->index2 * 2;
168        /* 4.12 * 8.8 -> 12.20; shift right 4 to get 16.16 */
169        val = (val * ((sat->cache[i] << 8) + sat->cache[i+1])) >> 4;
170    }
171
172    *value = val;
173    err = 0;
174
175 fail:
176    mutex_unlock(&sat->mutex);
177    return err;
178}
179
180static void wf_sat_release(struct kref *ref)
181{
182    struct wf_sat *sat = container_of(ref, struct wf_sat, ref);
183
184    if (sat->nr >= 0)
185        sats[sat->nr] = NULL;
186    kfree(sat);
187}
188
189static void wf_sat_sensor_release(struct wf_sensor *sr)
190{
191    struct wf_sat_sensor *sens = wf_to_sat(sr);
192    struct wf_sat *sat = sens->sat;
193
194    kfree(sens);
195    kref_put(&sat->ref, wf_sat_release);
196}
197
198static struct wf_sensor_ops wf_sat_ops = {
199    .get_value = wf_sat_sensor_get,
200    .release = wf_sat_sensor_release,
201    .owner = THIS_MODULE,
202};
203
204static int wf_sat_probe(struct i2c_client *client,
205            const struct i2c_device_id *id)
206{
207    struct device_node *dev = client->dev.of_node;
208    struct wf_sat *sat;
209    struct wf_sat_sensor *sens;
210    const u32 *reg;
211    const char *loc, *type;
212    u8 chip, core;
213    struct device_node *child;
214    int shift, cpu, index;
215    char *name;
216    int vsens[2], isens[2];
217
218    sat = kzalloc(sizeof(struct wf_sat), GFP_KERNEL);
219    if (sat == NULL)
220        return -ENOMEM;
221    sat->nr = -1;
222    sat->node = of_node_get(dev);
223    kref_init(&sat->ref);
224    mutex_init(&sat->mutex);
225    sat->i2c = client;
226    INIT_LIST_HEAD(&sat->sensors);
227    i2c_set_clientdata(client, sat);
228
229    vsens[0] = vsens[1] = -1;
230    isens[0] = isens[1] = -1;
231    child = NULL;
232    while ((child = of_get_next_child(dev, child)) != NULL) {
233        reg = of_get_property(child, "reg", NULL);
234        type = of_get_property(child, "device_type", NULL);
235        loc = of_get_property(child, "location", NULL);
236        if (reg == NULL || loc == NULL)
237            continue;
238
239        /* the cooked sensors are between 0x30 and 0x37 */
240        if (*reg < 0x30 || *reg > 0x37)
241            continue;
242        index = *reg - 0x30;
243
244        /* expect location to be CPU [AB][01] ... */
245        if (strncmp(loc, "CPU ", 4) != 0)
246            continue;
247        chip = loc[4] - 'A';
248        core = loc[5] - '0';
249        if (chip > 1 || core > 1) {
250            printk(KERN_ERR "wf_sat_create: don't understand "
251                   "location %s for %s\n", loc, child->full_name);
252            continue;
253        }
254        cpu = 2 * chip + core;
255        if (sat->nr < 0)
256            sat->nr = chip;
257        else if (sat->nr != chip) {
258            printk(KERN_ERR "wf_sat_create: can't cope with "
259                   "multiple CPU chips on one SAT (%s)\n", loc);
260            continue;
261        }
262
263        if (strcmp(type, "voltage-sensor") == 0) {
264            name = "cpu-voltage";
265            shift = 4;
266            vsens[core] = index;
267        } else if (strcmp(type, "current-sensor") == 0) {
268            name = "cpu-current";
269            shift = 8;
270            isens[core] = index;
271        } else if (strcmp(type, "temp-sensor") == 0) {
272            name = "cpu-temp";
273            shift = 10;
274        } else
275            continue; /* hmmm shouldn't happen */
276
277        /* the +16 is enough for "cpu-voltage-n" */
278        sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL);
279        if (sens == NULL) {
280            printk(KERN_ERR "wf_sat_create: couldn't create "
281                   "%s sensor %d (no memory)\n", name, cpu);
282            continue;
283        }
284        sens->index = index;
285        sens->index2 = -1;
286        sens->shift = shift;
287        sens->sat = sat;
288        sens->sens.ops = &wf_sat_ops;
289        sens->sens.name = (char *) (sens + 1);
290        snprintf((char *)sens->sens.name, 16, "%s-%d", name, cpu);
291
292        if (wf_register_sensor(&sens->sens))
293            kfree(sens);
294        else {
295            list_add(&sens->link, &sat->sensors);
296            kref_get(&sat->ref);
297        }
298    }
299
300    /* make the power sensors */
301    for (core = 0; core < 2; ++core) {
302        if (vsens[core] < 0 || isens[core] < 0)
303            continue;
304        cpu = 2 * sat->nr + core;
305        sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL);
306        if (sens == NULL) {
307            printk(KERN_ERR "wf_sat_create: couldn't create power "
308                   "sensor %d (no memory)\n", cpu);
309            continue;
310        }
311        sens->index = vsens[core];
312        sens->index2 = isens[core];
313        sens->shift = 0;
314        sens->sat = sat;
315        sens->sens.ops = &wf_sat_ops;
316        sens->sens.name = (char *) (sens + 1);
317        snprintf((char *)sens->sens.name, 16, "cpu-power-%d", cpu);
318
319        if (wf_register_sensor(&sens->sens))
320            kfree(sens);
321        else {
322            list_add(&sens->link, &sat->sensors);
323            kref_get(&sat->ref);
324        }
325    }
326
327    if (sat->nr >= 0)
328        sats[sat->nr] = sat;
329
330    return 0;
331}
332
333static int wf_sat_remove(struct i2c_client *client)
334{
335    struct wf_sat *sat = i2c_get_clientdata(client);
336    struct wf_sat_sensor *sens;
337
338    /* release sensors */
339    while(!list_empty(&sat->sensors)) {
340        sens = list_first_entry(&sat->sensors,
341                    struct wf_sat_sensor, link);
342        list_del(&sens->link);
343        wf_unregister_sensor(&sens->sens);
344    }
345    sat->i2c = NULL;
346    i2c_set_clientdata(client, NULL);
347    kref_put(&sat->ref, wf_sat_release);
348
349    return 0;
350}
351
352static const struct i2c_device_id wf_sat_id[] = {
353    { "MAC,smu-sat", 0 },
354    { }
355};
356MODULE_DEVICE_TABLE(i2c, wf_sat_id);
357
358static struct i2c_driver wf_sat_driver = {
359    .driver = {
360        .name = "wf_smu_sat",
361    },
362    .probe = wf_sat_probe,
363    .remove = wf_sat_remove,
364    .id_table = wf_sat_id,
365};
366
367static int __init sat_sensors_init(void)
368{
369    return i2c_add_driver(&wf_sat_driver);
370}
371
372static void __exit sat_sensors_exit(void)
373{
374    i2c_del_driver(&wf_sat_driver);
375}
376
377module_init(sat_sensors_init);
378module_exit(sat_sensors_exit);
379
380MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
381MODULE_DESCRIPTION("SMU satellite sensors for PowerMac thermal control");
382MODULE_LICENSE("GPL");
383

Archive Download this file

Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master

Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9



interactive