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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/* If the cache is older than 800ms we'll refetch it */
26#define MAX_AGE msecs_to_jiffies(800)
27
28struct wf_sat {
29 struct kref ref;
30 int nr;
31 struct mutex mutex;
32 unsigned long last_read; /* jiffies when cache last updated */
33 u8 cache[16];
34 struct list_head sensors;
35 struct i2c_client *i2c;
36 struct device_node *node;
37};
38
39static struct wf_sat *sats[2];
40
41struct wf_sat_sensor {
42 struct list_head link;
43 int index;
44 int index2; /* used for power sensors */
45 int shift;
46 struct wf_sat *sat;
47 struct wf_sensor sens;
48};
49
50#define wf_to_sat(c) container_of(c, struct wf_sat_sensor, sens)
51
52struct smu_sdbp_header *smu_sat_get_sdb_partition(unsigned int sat_id, int id,
53 unsigned int *size)
54{
55 struct wf_sat *sat;
56 int err;
57 unsigned int i, len;
58 u8 *buf;
59 u8 data[4];
60
61 /* TODO: Add the resulting partition to the device-tree */
62
63 if (sat_id > 1 || (sat = sats[sat_id]) == NULL)
64 return NULL;
65
66 err = i2c_smbus_write_word_data(sat->i2c, 8, id << 8);
67 if (err) {
68 printk(KERN_ERR "smu_sat_get_sdb_part wr error %d\n", err);
69 return NULL;
70 }
71
72 err = i2c_smbus_read_word_data(sat->i2c, 9);
73 if (err < 0) {
74 printk(KERN_ERR "smu_sat_get_sdb_part rd len error\n");
75 return NULL;
76 }
77 len = err;
78 if (len == 0) {
79 printk(KERN_ERR "smu_sat_get_sdb_part no partition %x\n", id);
80 return NULL;
81 }
82
83 len = le16_to_cpu(len);
84 len = (len + 3) & ~3;
85 buf = kmalloc(len, GFP_KERNEL);
86 if (buf == NULL)
87 return NULL;
88
89 for (i = 0; i < len; i += 4) {
90 err = i2c_smbus_read_i2c_block_data(sat->i2c, 0xa, 4, data);
91 if (err < 0) {
92 printk(KERN_ERR "smu_sat_get_sdb_part rd err %d\n",
93 err);
94 goto fail;
95 }
96 buf[i] = data[1];
97 buf[i+1] = data[0];
98 buf[i+2] = data[3];
99 buf[i+3] = data[2];
100 }
101
102 printk(KERN_DEBUG "sat %d partition %x:", sat_id, id);
103 print_hex_dump(KERN_DEBUG, " ", DUMP_PREFIX_OFFSET,
104 16, 1, buf, len, false);
105 if (size)
106 *size = len;
107 return (struct smu_sdbp_header *) buf;
108
109 fail:
110 kfree(buf);
111 return NULL;
112}
113EXPORT_SYMBOL_GPL(smu_sat_get_sdb_partition);
114
115/* refresh the cache */
116static int wf_sat_read_cache(struct wf_sat *sat)
117{
118 int err;
119
120 err = i2c_smbus_read_i2c_block_data(sat->i2c, 0x3f, 16, sat->cache);
121 if (err < 0)
122 return err;
123 sat->last_read = jiffies;
124
125#ifdef LOTSA_DEBUG
126 {
127 int i;
128 printk(KERN_DEBUG "wf_sat_get: data is");
129 print_hex_dump(KERN_DEBUG, " ", DUMP_PREFIX_OFFSET,
130 16, 1, sat->cache, 16, false);
131 }
132#endif
133 return 0;
134}
135
136static int wf_sat_sensor_get(struct wf_sensor *sr, s32 *value)
137{
138 struct wf_sat_sensor *sens = wf_to_sat(sr);
139 struct wf_sat *sat = sens->sat;
140 int i, err;
141 s32 val;
142
143 if (sat->i2c == NULL)
144 return -ENODEV;
145
146 mutex_lock(&sat->mutex);
147 if (time_after(jiffies, (sat->last_read + MAX_AGE))) {
148 err = wf_sat_read_cache(sat);
149 if (err)
150 goto fail;
151 }
152
153 i = sens->index * 2;
154 val = ((sat->cache[i] << 8) + sat->cache[i+1]) << sens->shift;
155 if (sens->index2 >= 0) {
156 i = sens->index2 * 2;
157 /* 4.12 * 8.8 -> 12.20; shift right 4 to get 16.16 */
158 val = (val * ((sat->cache[i] << 8) + sat->cache[i+1])) >> 4;
159 }
160
161 *value = val;
162 err = 0;
163
164 fail:
165 mutex_unlock(&sat->mutex);
166 return err;
167}
168
169static void wf_sat_release(struct kref *ref)
170{
171 struct wf_sat *sat = container_of(ref, struct wf_sat, ref);
172
173 if (sat->nr >= 0)
174 sats[sat->nr] = NULL;
175 kfree(sat);
176}
177
178static void wf_sat_sensor_release(struct wf_sensor *sr)
179{
180 struct wf_sat_sensor *sens = wf_to_sat(sr);
181 struct wf_sat *sat = sens->sat;
182
183 kfree(sens);
184 kref_put(&sat->ref, wf_sat_release);
185}
186
187static const struct wf_sensor_ops wf_sat_ops = {
188 .get_value = wf_sat_sensor_get,
189 .release = wf_sat_sensor_release,
190 .owner = THIS_MODULE,
191};
192
193static int wf_sat_probe(struct i2c_client *client,
194 const struct i2c_device_id *id)
195{
196 struct device_node *dev = client->dev.of_node;
197 struct wf_sat *sat;
198 struct wf_sat_sensor *sens;
199 const u32 *reg;
200 const char *loc;
201 u8 chip, core;
202 struct device_node *child;
203 int shift, cpu, index;
204 char *name;
205 int vsens[2], isens[2];
206
207 sat = kzalloc(sizeof(struct wf_sat), GFP_KERNEL);
208 if (sat == NULL)
209 return -ENOMEM;
210 sat->nr = -1;
211 sat->node = of_node_get(dev);
212 kref_init(&sat->ref);
213 mutex_init(&sat->mutex);
214 sat->i2c = client;
215 INIT_LIST_HEAD(&sat->sensors);
216 i2c_set_clientdata(client, sat);
217
218 vsens[0] = vsens[1] = -1;
219 isens[0] = isens[1] = -1;
220 child = NULL;
221 while ((child = of_get_next_child(dev, child)) != NULL) {
222 reg = of_get_property(child, "reg", NULL);
223 loc = of_get_property(child, "location", NULL);
224 if (reg == NULL || loc == NULL)
225 continue;
226
227 /* the cooked sensors are between 0x30 and 0x37 */
228 if (*reg < 0x30 || *reg > 0x37)
229 continue;
230 index = *reg - 0x30;
231
232 /* expect location to be CPU [AB][01] ... */
233 if (strncmp(loc, "CPU ", 4) != 0)
234 continue;
235 chip = loc[4] - 'A';
236 core = loc[5] - '0';
237 if (chip > 1 || core > 1) {
238 printk(KERN_ERR "wf_sat_create: don't understand "
239 "location %s for %pOF\n", loc, child);
240 continue;
241 }
242 cpu = 2 * chip + core;
243 if (sat->nr < 0)
244 sat->nr = chip;
245 else if (sat->nr != chip) {
246 printk(KERN_ERR "wf_sat_create: can't cope with "
247 "multiple CPU chips on one SAT (%s)\n", loc);
248 continue;
249 }
250
251 if (of_node_is_type(child, "voltage-sensor")) {
252 name = "cpu-voltage";
253 shift = 4;
254 vsens[core] = index;
255 } else if (of_node_is_type(child, "current-sensor")) {
256 name = "cpu-current";
257 shift = 8;
258 isens[core] = index;
259 } else if (of_node_is_type(child, "temp-sensor")) {
260 name = "cpu-temp";
261 shift = 10;
262 } else
263 continue; /* hmmm shouldn't happen */
264
265 /* the +16 is enough for "cpu-voltage-n" */
266 sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL);
267 if (sens == NULL) {
268 printk(KERN_ERR "wf_sat_create: couldn't create "
269 "%s sensor %d (no memory)\n", name, cpu);
270 continue;
271 }
272 sens->index = index;
273 sens->index2 = -1;
274 sens->shift = shift;
275 sens->sat = sat;
276 sens->sens.ops = &wf_sat_ops;
277 sens->sens.name = (char *) (sens + 1);
278 snprintf((char *)sens->sens.name, 16, "%s-%d", name, cpu);
279
280 if (wf_register_sensor(&sens->sens))
281 kfree(sens);
282 else {
283 list_add(&sens->link, &sat->sensors);
284 kref_get(&sat->ref);
285 }
286 }
287
288 /* make the power sensors */
289 for (core = 0; core < 2; ++core) {
290 if (vsens[core] < 0 || isens[core] < 0)
291 continue;
292 cpu = 2 * sat->nr + core;
293 sens = kzalloc(sizeof(struct wf_sat_sensor) + 16, GFP_KERNEL);
294 if (sens == NULL) {
295 printk(KERN_ERR "wf_sat_create: couldn't create power "
296 "sensor %d (no memory)\n", cpu);
297 continue;
298 }
299 sens->index = vsens[core];
300 sens->index2 = isens[core];
301 sens->shift = 0;
302 sens->sat = sat;
303 sens->sens.ops = &wf_sat_ops;
304 sens->sens.name = (char *) (sens + 1);
305 snprintf((char *)sens->sens.name, 16, "cpu-power-%d", cpu);
306
307 if (wf_register_sensor(&sens->sens))
308 kfree(sens);
309 else {
310 list_add(&sens->link, &sat->sensors);
311 kref_get(&sat->ref);
312 }
313 }
314
315 if (sat->nr >= 0)
316 sats[sat->nr] = sat;
317
318 return 0;
319}
320
321static int wf_sat_remove(struct i2c_client *client)
322{
323 struct wf_sat *sat = i2c_get_clientdata(client);
324 struct wf_sat_sensor *sens;
325
326 /* release sensors */
327 while(!list_empty(&sat->sensors)) {
328 sens = list_first_entry(&sat->sensors,
329 struct wf_sat_sensor, link);
330 list_del(&sens->link);
331 wf_unregister_sensor(&sens->sens);
332 }
333 sat->i2c = NULL;
334 kref_put(&sat->ref, wf_sat_release);
335
336 return 0;
337}
338
339static const struct i2c_device_id wf_sat_id[] = {
340 { "MAC,smu-sat", 0 },
341 { }
342};
343MODULE_DEVICE_TABLE(i2c, wf_sat_id);
344
345static struct i2c_driver wf_sat_driver = {
346 .driver = {
347 .name = "wf_smu_sat",
348 },
349 .probe = wf_sat_probe,
350 .remove = wf_sat_remove,
351 .id_table = wf_sat_id,
352};
353
354module_i2c_driver(wf_sat_driver);
355
356MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
357MODULE_DESCRIPTION("SMU satellite sensors for PowerMac thermal control");
358MODULE_LICENSE("GPL");
359

Warning: That file was not part of the compilation database. It may have many parsing errors.