Merge branch 'staging-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[zen-stable.git] / drivers / macintosh / windfarm_smu_controls.c
blob43137b421f92048cde69327399d3e4c0024a692a
1 /*
2 * Windfarm PowerMac thermal control. SMU based controls
4 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
5 * <benh@kernel.crashing.org>
7 * Released under the term of the GNU GPL v2.
8 */
10 #include <linux/types.h>
11 #include <linux/errno.h>
12 #include <linux/kernel.h>
13 #include <linux/delay.h>
14 #include <linux/slab.h>
15 #include <linux/init.h>
16 #include <linux/wait.h>
17 #include <linux/completion.h>
18 #include <asm/prom.h>
19 #include <asm/machdep.h>
20 #include <asm/io.h>
21 #include <asm/system.h>
22 #include <asm/sections.h>
23 #include <asm/smu.h>
25 #include "windfarm.h"
27 #define VERSION "0.4"
29 #undef DEBUG
31 #ifdef DEBUG
32 #define DBG(args...) printk(args)
33 #else
34 #define DBG(args...) do { } while(0)
35 #endif
37 static int smu_supports_new_fans_ops = 1;
40 * SMU fans control object
43 static LIST_HEAD(smu_fans);
45 struct smu_fan_control {
46 struct list_head link;
47 int fan_type; /* 0 = rpm, 1 = pwm */
48 u32 reg; /* index in SMU */
49 s32 value; /* current value */
50 s32 min, max; /* min/max values */
51 struct wf_control ctrl;
53 #define to_smu_fan(c) container_of(c, struct smu_fan_control, ctrl)
55 static int smu_set_fan(int pwm, u8 id, u16 value)
57 struct smu_cmd cmd;
58 u8 buffer[16];
59 DECLARE_COMPLETION_ONSTACK(comp);
60 int rc;
62 /* Fill SMU command structure */
63 cmd.cmd = SMU_CMD_FAN_COMMAND;
65 /* The SMU has an "old" and a "new" way of setting the fan speed
66 * Unfortunately, I found no reliable way to know which one works
67 * on a given machine model. After some investigations it appears
68 * that MacOS X just tries the new one, and if it fails fallbacks
69 * to the old ones ... Ugh.
71 retry:
72 if (smu_supports_new_fans_ops) {
73 buffer[0] = 0x30;
74 buffer[1] = id;
75 *((u16 *)(&buffer[2])) = value;
76 cmd.data_len = 4;
77 } else {
78 if (id > 7)
79 return -EINVAL;
80 /* Fill argument buffer */
81 memset(buffer, 0, 16);
82 buffer[0] = pwm ? 0x10 : 0x00;
83 buffer[1] = 0x01 << id;
84 *((u16 *)&buffer[2 + id * 2]) = value;
85 cmd.data_len = 14;
88 cmd.reply_len = 16;
89 cmd.data_buf = cmd.reply_buf = buffer;
90 cmd.status = 0;
91 cmd.done = smu_done_complete;
92 cmd.misc = &comp;
94 rc = smu_queue_cmd(&cmd);
95 if (rc)
96 return rc;
97 wait_for_completion(&comp);
99 /* Handle fallback (see coment above) */
100 if (cmd.status != 0 && smu_supports_new_fans_ops) {
101 printk(KERN_WARNING "windfarm: SMU failed new fan command "
102 "falling back to old method\n");
103 smu_supports_new_fans_ops = 0;
104 goto retry;
107 return cmd.status;
110 static void smu_fan_release(struct wf_control *ct)
112 struct smu_fan_control *fct = to_smu_fan(ct);
114 kfree(fct);
117 static int smu_fan_set(struct wf_control *ct, s32 value)
119 struct smu_fan_control *fct = to_smu_fan(ct);
121 if (value < fct->min)
122 value = fct->min;
123 if (value > fct->max)
124 value = fct->max;
125 fct->value = value;
127 return smu_set_fan(fct->fan_type, fct->reg, value);
130 static int smu_fan_get(struct wf_control *ct, s32 *value)
132 struct smu_fan_control *fct = to_smu_fan(ct);
133 *value = fct->value; /* todo: read from SMU */
134 return 0;
137 static s32 smu_fan_min(struct wf_control *ct)
139 struct smu_fan_control *fct = to_smu_fan(ct);
140 return fct->min;
143 static s32 smu_fan_max(struct wf_control *ct)
145 struct smu_fan_control *fct = to_smu_fan(ct);
146 return fct->max;
149 static struct wf_control_ops smu_fan_ops = {
150 .set_value = smu_fan_set,
151 .get_value = smu_fan_get,
152 .get_min = smu_fan_min,
153 .get_max = smu_fan_max,
154 .release = smu_fan_release,
155 .owner = THIS_MODULE,
158 static struct smu_fan_control *smu_fan_create(struct device_node *node,
159 int pwm_fan)
161 struct smu_fan_control *fct;
162 const s32 *v;
163 const u32 *reg;
164 const char *l;
166 fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL);
167 if (fct == NULL)
168 return NULL;
169 fct->ctrl.ops = &smu_fan_ops;
170 l = of_get_property(node, "location", NULL);
171 if (l == NULL)
172 goto fail;
174 fct->fan_type = pwm_fan;
175 fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN;
176 sysfs_attr_init(&fct->ctrl.attr.attr);
178 /* We use the name & location here the same way we do for SMU sensors,
179 * see the comment in windfarm_smu_sensors.c. The locations are a bit
180 * less consistent here between the iMac and the desktop models, but
181 * that is good enough for our needs for now at least.
183 * One problem though is that Apple seem to be inconsistent with case
184 * and the kernel doesn't have strcasecmp =P
187 fct->ctrl.name = NULL;
189 /* Names used on desktop models */
190 if (!strcmp(l, "Rear Fan 0") || !strcmp(l, "Rear Fan") ||
191 !strcmp(l, "Rear fan 0") || !strcmp(l, "Rear fan") ||
192 !strcmp(l, "CPU A EXHAUST"))
193 fct->ctrl.name = "cpu-rear-fan-0";
194 else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1") ||
195 !strcmp(l, "CPU B EXHAUST"))
196 fct->ctrl.name = "cpu-rear-fan-1";
197 else if (!strcmp(l, "Front Fan 0") || !strcmp(l, "Front Fan") ||
198 !strcmp(l, "Front fan 0") || !strcmp(l, "Front fan") ||
199 !strcmp(l, "CPU A INTAKE"))
200 fct->ctrl.name = "cpu-front-fan-0";
201 else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1") ||
202 !strcmp(l, "CPU B INTAKE"))
203 fct->ctrl.name = "cpu-front-fan-1";
204 else if (!strcmp(l, "CPU A PUMP"))
205 fct->ctrl.name = "cpu-pump-0";
206 else if (!strcmp(l, "CPU B PUMP"))
207 fct->ctrl.name = "cpu-pump-1";
208 else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan") ||
209 !strcmp(l, "EXPANSION SLOTS INTAKE"))
210 fct->ctrl.name = "slots-fan";
211 else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay") ||
212 !strcmp(l, "DRIVE BAY A INTAKE"))
213 fct->ctrl.name = "drive-bay-fan";
214 else if (!strcmp(l, "BACKSIDE"))
215 fct->ctrl.name = "backside-fan";
217 /* Names used on iMac models */
218 if (!strcmp(l, "System Fan") || !strcmp(l, "System fan"))
219 fct->ctrl.name = "system-fan";
220 else if (!strcmp(l, "CPU Fan") || !strcmp(l, "CPU fan"))
221 fct->ctrl.name = "cpu-fan";
222 else if (!strcmp(l, "Hard Drive") || !strcmp(l, "Hard drive"))
223 fct->ctrl.name = "drive-bay-fan";
224 else if (!strcmp(l, "HDD Fan")) /* seen on iMac G5 iSight */
225 fct->ctrl.name = "hard-drive-fan";
226 else if (!strcmp(l, "ODD Fan")) /* same */
227 fct->ctrl.name = "optical-drive-fan";
229 /* Unrecognized fan, bail out */
230 if (fct->ctrl.name == NULL)
231 goto fail;
233 /* Get min & max values*/
234 v = of_get_property(node, "min-value", NULL);
235 if (v == NULL)
236 goto fail;
237 fct->min = *v;
238 v = of_get_property(node, "max-value", NULL);
239 if (v == NULL)
240 goto fail;
241 fct->max = *v;
243 /* Get "reg" value */
244 reg = of_get_property(node, "reg", NULL);
245 if (reg == NULL)
246 goto fail;
247 fct->reg = *reg;
249 if (wf_register_control(&fct->ctrl))
250 goto fail;
252 return fct;
253 fail:
254 kfree(fct);
255 return NULL;
259 static int __init smu_controls_init(void)
261 struct device_node *smu, *fans, *fan;
263 if (!smu_present())
264 return -ENODEV;
266 smu = of_find_node_by_type(NULL, "smu");
267 if (smu == NULL)
268 return -ENODEV;
270 /* Look for RPM fans */
271 for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
272 if (!strcmp(fans->name, "rpm-fans") ||
273 of_device_is_compatible(fans, "smu-rpm-fans"))
274 break;
275 for (fan = NULL;
276 fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
277 struct smu_fan_control *fct;
279 fct = smu_fan_create(fan, 0);
280 if (fct == NULL) {
281 printk(KERN_WARNING "windfarm: Failed to create SMU "
282 "RPM fan %s\n", fan->name);
283 continue;
285 list_add(&fct->link, &smu_fans);
287 of_node_put(fans);
290 /* Look for PWM fans */
291 for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
292 if (!strcmp(fans->name, "pwm-fans"))
293 break;
294 for (fan = NULL;
295 fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
296 struct smu_fan_control *fct;
298 fct = smu_fan_create(fan, 1);
299 if (fct == NULL) {
300 printk(KERN_WARNING "windfarm: Failed to create SMU "
301 "PWM fan %s\n", fan->name);
302 continue;
304 list_add(&fct->link, &smu_fans);
306 of_node_put(fans);
307 of_node_put(smu);
309 return 0;
312 static void __exit smu_controls_exit(void)
314 struct smu_fan_control *fct;
316 while (!list_empty(&smu_fans)) {
317 fct = list_entry(smu_fans.next, struct smu_fan_control, link);
318 list_del(&fct->link);
319 wf_unregister_control(&fct->ctrl);
324 module_init(smu_controls_init);
325 module_exit(smu_controls_exit);
327 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
328 MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control");
329 MODULE_LICENSE("GPL");