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[linux-2.6] / drivers / macintosh / windfarm_lm75_sensor.c
1 /*
2  * Windfarm PowerMac thermal control. LM75 sensor
3  *
4  * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
5  *                    <benh@kernel.crashing.org>
6  *
7  * Released under the term of the GNU GPL v2.
8  */
9
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/i2c.h>
18 #include <linux/i2c-dev.h>
19 #include <asm/prom.h>
20 #include <asm/machdep.h>
21 #include <asm/io.h>
22 #include <asm/system.h>
23 #include <asm/sections.h>
24
25 #include "windfarm.h"
26
27 #define VERSION "0.1"
28
29 #undef DEBUG
30
31 #ifdef DEBUG
32 #define DBG(args...)    printk(args)
33 #else
34 #define DBG(args...)    do { } while(0)
35 #endif
36
37 struct wf_lm75_sensor {
38         int                     ds1775 : 1;
39         int                     inited : 1;
40         struct  i2c_client      i2c;
41         struct  wf_sensor       sens;
42 };
43 #define wf_to_lm75(c) container_of(c, struct wf_lm75_sensor, sens)
44 #define i2c_to_lm75(c) container_of(c, struct wf_lm75_sensor, i2c)
45
46 static int wf_lm75_attach(struct i2c_adapter *adapter);
47 static int wf_lm75_detach(struct i2c_client *client);
48
49 static struct i2c_driver wf_lm75_driver = {
50         .driver = {
51                 .owner  = THIS_MODULE,
52                 .name   = "wf_lm75",
53         },
54         .attach_adapter = wf_lm75_attach,
55         .detach_client  = wf_lm75_detach,
56 };
57
58 static int wf_lm75_get(struct wf_sensor *sr, s32 *value)
59 {
60         struct wf_lm75_sensor *lm = wf_to_lm75(sr);
61         s32 data;
62
63         if (lm->i2c.adapter == NULL)
64                 return -ENODEV;
65
66         /* Init chip if necessary */
67         if (!lm->inited) {
68                 u8 cfg_new, cfg = (u8)i2c_smbus_read_byte_data(&lm->i2c, 1);
69
70                 DBG("wf_lm75: Initializing %s, cfg was: %02x\n",
71                     sr->name, cfg);
72
73                 /* clear shutdown bit, keep other settings as left by
74                  * the firmware for now
75                  */
76                 cfg_new = cfg & ~0x01;
77                 i2c_smbus_write_byte_data(&lm->i2c, 1, cfg_new);
78                 lm->inited = 1;
79
80                 /* If we just powered it up, let's wait 200 ms */
81                 msleep(200);
82         }
83
84         /* Read temperature register */
85         data = (s32)le16_to_cpu(i2c_smbus_read_word_data(&lm->i2c, 0));
86         data <<= 8;
87         *value = data;
88
89         return 0;
90 }
91
92 static void wf_lm75_release(struct wf_sensor *sr)
93 {
94         struct wf_lm75_sensor *lm = wf_to_lm75(sr);
95
96         /* check if client is registered and detach from i2c */
97         if (lm->i2c.adapter) {
98                 i2c_detach_client(&lm->i2c);
99                 lm->i2c.adapter = NULL;
100         }
101
102         kfree(lm);
103 }
104
105 static struct wf_sensor_ops wf_lm75_ops = {
106         .get_value      = wf_lm75_get,
107         .release        = wf_lm75_release,
108         .owner          = THIS_MODULE,
109 };
110
111 static struct wf_lm75_sensor *wf_lm75_create(struct i2c_adapter *adapter,
112                                              u8 addr, int ds1775,
113                                              const char *loc)
114 {
115         struct wf_lm75_sensor *lm;
116
117         DBG("wf_lm75: creating  %s device at address 0x%02x\n",
118             ds1775 ? "ds1775" : "lm75", addr);
119
120         lm = kmalloc(sizeof(struct wf_lm75_sensor), GFP_KERNEL);
121         if (lm == NULL)
122                 return NULL;
123         memset(lm, 0, sizeof(struct wf_lm75_sensor));
124
125         /* Usual rant about sensor names not beeing very consistent in
126          * the device-tree, oh well ...
127          * Add more entries below as you deal with more setups
128          */
129         if (!strcmp(loc, "Hard drive") || !strcmp(loc, "DRIVE BAY"))
130                 lm->sens.name = "hd-temp";
131         else
132                 goto fail;
133
134         lm->inited = 0;
135         lm->sens.ops = &wf_lm75_ops;
136         lm->ds1775 = ds1775;
137         lm->i2c.addr = (addr >> 1) & 0x7f;
138         lm->i2c.adapter = adapter;
139         lm->i2c.driver = &wf_lm75_driver;
140         strncpy(lm->i2c.name, lm->sens.name, I2C_NAME_SIZE-1);
141
142         if (i2c_attach_client(&lm->i2c)) {
143                 printk(KERN_ERR "windfarm: failed to attach %s %s to i2c\n",
144                        ds1775 ? "ds1775" : "lm75", lm->i2c.name);
145                 goto fail;
146         }
147
148         if (wf_register_sensor(&lm->sens)) {
149                 i2c_detach_client(&lm->i2c);
150                 goto fail;
151         }
152
153         return lm;
154  fail:
155         kfree(lm);
156         return NULL;
157 }
158
159 static int wf_lm75_attach(struct i2c_adapter *adapter)
160 {
161         u8 bus_id;
162         struct device_node *smu, *bus, *dev;
163
164         /* We currently only deal with LM75's hanging off the SMU
165          * i2c busses. If we extend that driver to other/older
166          * machines, we should split this function into SMU-i2c,
167          * keywest-i2c, PMU-i2c, ...
168          */
169
170         DBG("wf_lm75: adapter %s detected\n", adapter->name);
171
172         if (strncmp(adapter->name, "smu-i2c-", 8) != 0)
173                 return 0;
174         smu = of_find_node_by_type(NULL, "smu");
175         if (smu == NULL)
176                 return 0;
177
178         /* Look for the bus in the device-tree */
179         bus_id = (u8)simple_strtoul(adapter->name + 8, NULL, 16);
180
181         DBG("wf_lm75: bus ID is %x\n", bus_id);
182
183         /* Look for sensors subdir */
184         for (bus = NULL;
185              (bus = of_get_next_child(smu, bus)) != NULL;) {
186                 u32 *reg;
187
188                 if (strcmp(bus->name, "i2c"))
189                         continue;
190                 reg = (u32 *)get_property(bus, "reg", NULL);
191                 if (reg == NULL)
192                         continue;
193                 if (bus_id == *reg)
194                         break;
195         }
196         of_node_put(smu);
197         if (bus == NULL) {
198                 printk(KERN_WARNING "windfarm: SMU i2c bus 0x%x not found"
199                        " in device-tree !\n", bus_id);
200                 return 0;
201         }
202
203         DBG("wf_lm75: bus found, looking for device...\n");
204
205         /* Now look for lm75(s) in there */
206         for (dev = NULL;
207              (dev = of_get_next_child(bus, dev)) != NULL;) {
208                 const char *loc =
209                         get_property(dev, "hwsensor-location", NULL);
210                 u32 *reg = (u32 *)get_property(dev, "reg", NULL);
211                 DBG(" dev: %s... (loc: %p, reg: %p)\n", dev->name, loc, reg);
212                 if (loc == NULL || reg == NULL)
213                         continue;
214                 /* real lm75 */
215                 if (device_is_compatible(dev, "lm75"))
216                         wf_lm75_create(adapter, *reg, 0, loc);
217                 /* ds1775 (compatible, better resolution */
218                 else if (device_is_compatible(dev, "ds1775"))
219                         wf_lm75_create(adapter, *reg, 1, loc);
220         }
221
222         of_node_put(bus);
223
224         return 0;
225 }
226
227 static int wf_lm75_detach(struct i2c_client *client)
228 {
229         struct wf_lm75_sensor *lm = i2c_to_lm75(client);
230
231         DBG("wf_lm75: i2c detatch called for %s\n", lm->sens.name);
232
233         /* Mark client detached */
234         lm->i2c.adapter = NULL;
235
236         /* release sensor */
237         wf_unregister_sensor(&lm->sens);
238
239         return 0;
240 }
241
242 static int __init wf_lm75_sensor_init(void)
243 {
244         int rc;
245
246         rc = i2c_add_driver(&wf_lm75_driver);
247         if (rc < 0)
248                 return rc;
249         return 0;
250 }
251
252 static void __exit wf_lm75_sensor_exit(void)
253 {
254         i2c_del_driver(&wf_lm75_driver);
255 }
256
257
258 module_init(wf_lm75_sensor_init);
259 module_exit(wf_lm75_sensor_exit);
260
261 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
262 MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control");
263 MODULE_LICENSE("GPL");
264