[POWERPC] Rename get_property to of_get_property: drivers
[linux-2.6.git] / 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 <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/pmac_low_i2c.h>
24
25 #include "windfarm.h"
26
27 #define VERSION "0.2"
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                 .name   = "wf_lm75",
52         },
53         .attach_adapter = wf_lm75_attach,
54         .detach_client  = wf_lm75_detach,
55 };
56
57 static int wf_lm75_get(struct wf_sensor *sr, s32 *value)
58 {
59         struct wf_lm75_sensor *lm = wf_to_lm75(sr);
60         s32 data;
61
62         if (lm->i2c.adapter == NULL)
63                 return -ENODEV;
64
65         /* Init chip if necessary */
66         if (!lm->inited) {
67                 u8 cfg_new, cfg = (u8)i2c_smbus_read_byte_data(&lm->i2c, 1);
68
69                 DBG("wf_lm75: Initializing %s, cfg was: %02x\n",
70                     sr->name, cfg);
71
72                 /* clear shutdown bit, keep other settings as left by
73                  * the firmware for now
74                  */
75                 cfg_new = cfg & ~0x01;
76                 i2c_smbus_write_byte_data(&lm->i2c, 1, cfg_new);
77                 lm->inited = 1;
78
79                 /* If we just powered it up, let's wait 200 ms */
80                 msleep(200);
81         }
82
83         /* Read temperature register */
84         data = (s32)le16_to_cpu(i2c_smbus_read_word_data(&lm->i2c, 0));
85         data <<= 8;
86         *value = data;
87
88         return 0;
89 }
90
91 static void wf_lm75_release(struct wf_sensor *sr)
92 {
93         struct wf_lm75_sensor *lm = wf_to_lm75(sr);
94
95         /* check if client is registered and detach from i2c */
96         if (lm->i2c.adapter) {
97                 i2c_detach_client(&lm->i2c);
98                 lm->i2c.adapter = NULL;
99         }
100
101         kfree(lm);
102 }
103
104 static struct wf_sensor_ops wf_lm75_ops = {
105         .get_value      = wf_lm75_get,
106         .release        = wf_lm75_release,
107         .owner          = THIS_MODULE,
108 };
109
110 static struct wf_lm75_sensor *wf_lm75_create(struct i2c_adapter *adapter,
111                                              u8 addr, int ds1775,
112                                              const char *loc)
113 {
114         struct wf_lm75_sensor *lm;
115         int rc;
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         rc = i2c_attach_client(&lm->i2c);
143         if (rc) {
144                 printk(KERN_ERR "windfarm: failed to attach %s %s to i2c,"
145                        " err %d\n", ds1775 ? "ds1775" : "lm75",
146                        lm->i2c.name, rc);
147                 goto fail;
148         }
149
150         if (wf_register_sensor(&lm->sens)) {
151                 i2c_detach_client(&lm->i2c);
152                 goto fail;
153         }
154
155         return lm;
156  fail:
157         kfree(lm);
158         return NULL;
159 }
160
161 static int wf_lm75_attach(struct i2c_adapter *adapter)
162 {
163         struct device_node *busnode, *dev;
164         struct pmac_i2c_bus *bus;
165
166         DBG("wf_lm75: adapter %s detected\n", adapter->name);
167
168         bus = pmac_i2c_adapter_to_bus(adapter);
169         if (bus == NULL)
170                 return -ENODEV;
171         busnode = pmac_i2c_get_bus_node(bus);
172
173         DBG("wf_lm75: bus found, looking for device...\n");
174
175         /* Now look for lm75(s) in there */
176         for (dev = NULL;
177              (dev = of_get_next_child(busnode, dev)) != NULL;) {
178                 const char *loc =
179                         of_get_property(dev, "hwsensor-location", NULL);
180                 u8 addr;
181
182                 /* We must re-match the adapter in order to properly check
183                  * the channel on multibus setups
184                  */
185                 if (!pmac_i2c_match_adapter(dev, adapter))
186                         continue;
187                 addr = pmac_i2c_get_dev_addr(dev);
188                 if (loc == NULL || addr == 0)
189                         continue;
190                 /* real lm75 */
191                 if (device_is_compatible(dev, "lm75"))
192                         wf_lm75_create(adapter, addr, 0, loc);
193                 /* ds1775 (compatible, better resolution */
194                 else if (device_is_compatible(dev, "ds1775"))
195                         wf_lm75_create(adapter, addr, 1, loc);
196         }
197         return 0;
198 }
199
200 static int wf_lm75_detach(struct i2c_client *client)
201 {
202         struct wf_lm75_sensor *lm = i2c_to_lm75(client);
203
204         DBG("wf_lm75: i2c detatch called for %s\n", lm->sens.name);
205
206         /* Mark client detached */
207         lm->i2c.adapter = NULL;
208
209         /* release sensor */
210         wf_unregister_sensor(&lm->sens);
211
212         return 0;
213 }
214
215 static int __init wf_lm75_sensor_init(void)
216 {
217         /* Don't register on old machines that use therm_pm72 for now */
218         if (machine_is_compatible("PowerMac7,2") ||
219             machine_is_compatible("PowerMac7,3") ||
220             machine_is_compatible("RackMac3,1"))
221                 return -ENODEV;
222         return i2c_add_driver(&wf_lm75_driver);
223 }
224
225 static void __exit wf_lm75_sensor_exit(void)
226 {
227         i2c_del_driver(&wf_lm75_driver);
228 }
229
230
231 module_init(wf_lm75_sensor_init);
232 module_exit(wf_lm75_sensor_exit);
233
234 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
235 MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control");
236 MODULE_LICENSE("GPL");
237