CIFS: Fix endian conversion of vcnum field
[linux-2.6/mini2440.git] / drivers / macintosh / windfarm_lm75_sensor.c
blobb92b959fe16e3a9d57ad4a610bd137f138a3d25d
1 /*
2 * Windfarm PowerMac thermal control. LM75 sensor
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/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>
25 #include "windfarm.h"
27 #define VERSION "0.2"
29 #undef DEBUG
31 #ifdef DEBUG
32 #define DBG(args...) printk(args)
33 #else
34 #define DBG(args...) do { } while(0)
35 #endif
37 struct wf_lm75_sensor {
38 int ds1775 : 1;
39 int inited : 1;
40 struct i2c_client i2c;
41 struct wf_sensor sens;
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)
46 static int wf_lm75_attach(struct i2c_adapter *adapter);
47 static int wf_lm75_detach(struct i2c_client *client);
49 static struct i2c_driver wf_lm75_driver = {
50 .driver = {
51 .name = "wf_lm75",
53 .attach_adapter = wf_lm75_attach,
54 .detach_client = wf_lm75_detach,
57 static int wf_lm75_get(struct wf_sensor *sr, s32 *value)
59 struct wf_lm75_sensor *lm = wf_to_lm75(sr);
60 s32 data;
62 if (lm->i2c.adapter == NULL)
63 return -ENODEV;
65 /* Init chip if necessary */
66 if (!lm->inited) {
67 u8 cfg_new, cfg = (u8)i2c_smbus_read_byte_data(&lm->i2c, 1);
69 DBG("wf_lm75: Initializing %s, cfg was: %02x\n",
70 sr->name, cfg);
72 /* clear shutdown bit, keep other settings as left by
73 * the firmware for now
75 cfg_new = cfg & ~0x01;
76 i2c_smbus_write_byte_data(&lm->i2c, 1, cfg_new);
77 lm->inited = 1;
79 /* If we just powered it up, let's wait 200 ms */
80 msleep(200);
83 /* Read temperature register */
84 data = (s32)le16_to_cpu(i2c_smbus_read_word_data(&lm->i2c, 0));
85 data <<= 8;
86 *value = data;
88 return 0;
91 static void wf_lm75_release(struct wf_sensor *sr)
93 struct wf_lm75_sensor *lm = wf_to_lm75(sr);
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;
101 kfree(lm);
104 static struct wf_sensor_ops wf_lm75_ops = {
105 .get_value = wf_lm75_get,
106 .release = wf_lm75_release,
107 .owner = THIS_MODULE,
110 static struct wf_lm75_sensor *wf_lm75_create(struct i2c_adapter *adapter,
111 u8 addr, int ds1775,
112 const char *loc)
114 struct wf_lm75_sensor *lm;
115 int rc;
117 DBG("wf_lm75: creating %s device at address 0x%02x\n",
118 ds1775 ? "ds1775" : "lm75", addr);
120 lm = kzalloc(sizeof(struct wf_lm75_sensor), GFP_KERNEL);
121 if (lm == NULL)
122 return NULL;
124 /* Usual rant about sensor names not beeing very consistent in
125 * the device-tree, oh well ...
126 * Add more entries below as you deal with more setups
128 if (!strcmp(loc, "Hard drive") || !strcmp(loc, "DRIVE BAY"))
129 lm->sens.name = "hd-temp";
130 else if (!strcmp(loc, "Incoming Air Temp"))
131 lm->sens.name = "incoming-air-temp";
132 else if (!strcmp(loc, "ODD Temp"))
133 lm->sens.name = "optical-drive-temp";
134 else if (!strcmp(loc, "HD Temp"))
135 lm->sens.name = "hard-drive-temp";
136 else
137 goto fail;
139 lm->inited = 0;
140 lm->sens.ops = &wf_lm75_ops;
141 lm->ds1775 = ds1775;
142 lm->i2c.addr = (addr >> 1) & 0x7f;
143 lm->i2c.adapter = adapter;
144 lm->i2c.driver = &wf_lm75_driver;
145 strncpy(lm->i2c.name, lm->sens.name, I2C_NAME_SIZE-1);
147 rc = i2c_attach_client(&lm->i2c);
148 if (rc) {
149 printk(KERN_ERR "windfarm: failed to attach %s %s to i2c,"
150 " err %d\n", ds1775 ? "ds1775" : "lm75",
151 lm->i2c.name, rc);
152 goto fail;
155 if (wf_register_sensor(&lm->sens)) {
156 i2c_detach_client(&lm->i2c);
157 goto fail;
160 return lm;
161 fail:
162 kfree(lm);
163 return NULL;
166 static int wf_lm75_attach(struct i2c_adapter *adapter)
168 struct device_node *busnode, *dev;
169 struct pmac_i2c_bus *bus;
171 DBG("wf_lm75: adapter %s detected\n", adapter->name);
173 bus = pmac_i2c_adapter_to_bus(adapter);
174 if (bus == NULL)
175 return -ENODEV;
176 busnode = pmac_i2c_get_bus_node(bus);
178 DBG("wf_lm75: bus found, looking for device...\n");
180 /* Now look for lm75(s) in there */
181 for (dev = NULL;
182 (dev = of_get_next_child(busnode, dev)) != NULL;) {
183 const char *loc =
184 of_get_property(dev, "hwsensor-location", NULL);
185 u8 addr;
187 /* We must re-match the adapter in order to properly check
188 * the channel on multibus setups
190 if (!pmac_i2c_match_adapter(dev, adapter))
191 continue;
192 addr = pmac_i2c_get_dev_addr(dev);
193 if (loc == NULL || addr == 0)
194 continue;
195 /* real lm75 */
196 if (of_device_is_compatible(dev, "lm75"))
197 wf_lm75_create(adapter, addr, 0, loc);
198 /* ds1775 (compatible, better resolution */
199 else if (of_device_is_compatible(dev, "ds1775"))
200 wf_lm75_create(adapter, addr, 1, loc);
202 return 0;
205 static int wf_lm75_detach(struct i2c_client *client)
207 struct wf_lm75_sensor *lm = i2c_to_lm75(client);
209 DBG("wf_lm75: i2c detatch called for %s\n", lm->sens.name);
211 /* Mark client detached */
212 lm->i2c.adapter = NULL;
214 /* release sensor */
215 wf_unregister_sensor(&lm->sens);
217 return 0;
220 static int __init wf_lm75_sensor_init(void)
222 /* Don't register on old machines that use therm_pm72 for now */
223 if (machine_is_compatible("PowerMac7,2") ||
224 machine_is_compatible("PowerMac7,3") ||
225 machine_is_compatible("RackMac3,1"))
226 return -ENODEV;
227 return i2c_add_driver(&wf_lm75_driver);
230 static void __exit wf_lm75_sensor_exit(void)
232 i2c_del_driver(&wf_lm75_driver);
236 module_init(wf_lm75_sensor_init);
237 module_exit(wf_lm75_sensor_exit);
239 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
240 MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control");
241 MODULE_LICENSE("GPL");