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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
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;
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;
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
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
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
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 const 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
240 if (*reg < 0x30 || *reg > 0x37)
241 continue;
242 index = *reg - 0x30;
243
244
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 %pOF\n", loc, child);
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;
276
277
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
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
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 kref_put(&sat->ref, wf_sat_release);
347
348 return 0;
349}
350
351static const struct i2c_device_id wf_sat_id[] = {
352 { "MAC,smu-sat", 0 },
353 { }
354};
355MODULE_DEVICE_TABLE(i2c, wf_sat_id);
356
357static struct i2c_driver wf_sat_driver = {
358 .driver = {
359 .name = "wf_smu_sat",
360 },
361 .probe = wf_sat_probe,
362 .remove = wf_sat_remove,
363 .id_table = wf_sat_id,
364};
365
366module_i2c_driver(wf_sat_driver);
367
368MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
369MODULE_DESCRIPTION("SMU satellite sensors for PowerMac thermal control");
370MODULE_LICENSE("GPL");
371
