blob: 529886c7a8263ae4d4d01df89b7b513695d983c3 [file] [log] [blame]
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +11001/*
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>
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110018#include <asm/prom.h>
19#include <asm/machdep.h>
20#include <asm/io.h>
21#include <asm/system.h>
22#include <asm/sections.h>
Benjamin Herrenschmidta28d3af2006-01-07 11:35:26 +110023#include <asm/pmac_low_i2c.h>
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110024
25#include "windfarm.h"
26
Benjamin Herrenschmidtb55fafc2006-03-03 17:03:21 +110027#define VERSION "0.2"
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110028
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
37struct wf_lm75_sensor {
38 int ds1775 : 1;
39 int inited : 1;
Jean Delvare351ca3e2009-06-15 18:01:51 +020040 struct i2c_client *i2c;
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110041 struct wf_sensor sens;
42};
43#define wf_to_lm75(c) container_of(c, struct wf_lm75_sensor, sens)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110044
45static int wf_lm75_get(struct wf_sensor *sr, s32 *value)
46{
47 struct wf_lm75_sensor *lm = wf_to_lm75(sr);
48 s32 data;
49
Jean Delvare351ca3e2009-06-15 18:01:51 +020050 if (lm->i2c == NULL)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110051 return -ENODEV;
52
53 /* Init chip if necessary */
54 if (!lm->inited) {
Jean Delvare351ca3e2009-06-15 18:01:51 +020055 u8 cfg_new, cfg = (u8)i2c_smbus_read_byte_data(lm->i2c, 1);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110056
57 DBG("wf_lm75: Initializing %s, cfg was: %02x\n",
58 sr->name, cfg);
59
60 /* clear shutdown bit, keep other settings as left by
61 * the firmware for now
62 */
63 cfg_new = cfg & ~0x01;
Jean Delvare351ca3e2009-06-15 18:01:51 +020064 i2c_smbus_write_byte_data(lm->i2c, 1, cfg_new);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110065 lm->inited = 1;
66
67 /* If we just powered it up, let's wait 200 ms */
68 msleep(200);
69 }
70
71 /* Read temperature register */
Jean Delvare351ca3e2009-06-15 18:01:51 +020072 data = (s32)le16_to_cpu(i2c_smbus_read_word_data(lm->i2c, 0));
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110073 data <<= 8;
74 *value = data;
75
76 return 0;
77}
78
79static void wf_lm75_release(struct wf_sensor *sr)
80{
81 struct wf_lm75_sensor *lm = wf_to_lm75(sr);
82
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110083 kfree(lm);
84}
85
86static struct wf_sensor_ops wf_lm75_ops = {
87 .get_value = wf_lm75_get,
88 .release = wf_lm75_release,
89 .owner = THIS_MODULE,
90};
91
Jean Delvare351ca3e2009-06-15 18:01:51 +020092static int wf_lm75_probe(struct i2c_client *client,
93 const struct i2c_device_id *id)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110094{
95 struct wf_lm75_sensor *lm;
Benjamin Herrenschmidtb55fafc2006-03-03 17:03:21 +110096 int rc;
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110097
Yoann Padioleaudd00cc42007-07-19 01:49:03 -070098 lm = kzalloc(sizeof(struct wf_lm75_sensor), GFP_KERNEL);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110099 if (lm == NULL)
Jean Delvare351ca3e2009-06-15 18:01:51 +0200100 return -ENODEV;
101
102 lm->inited = 0;
103 lm->ds1775 = id->driver_data;
104 lm->i2c = client;
105 lm->sens.name = client->dev.platform_data;
106 lm->sens.ops = &wf_lm75_ops;
107 i2c_set_clientdata(client, lm);
108
109 rc = wf_register_sensor(&lm->sens);
110 if (rc) {
111 i2c_set_clientdata(client, NULL);
112 kfree(lm);
113 }
114
115 return rc;
116}
117
118static struct i2c_client *wf_lm75_create(struct i2c_adapter *adapter,
119 u8 addr, int ds1775,
120 const char *loc)
121{
122 struct i2c_board_info info;
123 struct i2c_client *client;
124 char *name;
125
126 DBG("wf_lm75: creating %s device at address 0x%02x\n",
127 ds1775 ? "ds1775" : "lm75", addr);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100128
129 /* Usual rant about sensor names not beeing very consistent in
130 * the device-tree, oh well ...
131 * Add more entries below as you deal with more setups
132 */
133 if (!strcmp(loc, "Hard drive") || !strcmp(loc, "DRIVE BAY"))
Jean Delvare351ca3e2009-06-15 18:01:51 +0200134 name = "hd-temp";
Étienne Bersac80ff9742008-04-29 15:39:55 +1000135 else if (!strcmp(loc, "Incoming Air Temp"))
Jean Delvare351ca3e2009-06-15 18:01:51 +0200136 name = "incoming-air-temp";
Étienne Bersac80ff9742008-04-29 15:39:55 +1000137 else if (!strcmp(loc, "ODD Temp"))
Jean Delvare351ca3e2009-06-15 18:01:51 +0200138 name = "optical-drive-temp";
Étienne Bersac80ff9742008-04-29 15:39:55 +1000139 else if (!strcmp(loc, "HD Temp"))
Jean Delvare351ca3e2009-06-15 18:01:51 +0200140 name = "hard-drive-temp";
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100141 else
142 goto fail;
143
Jean Delvare351ca3e2009-06-15 18:01:51 +0200144 memset(&info, 0, sizeof(struct i2c_board_info));
145 info.addr = (addr >> 1) & 0x7f;
146 info.platform_data = name;
147 strlcpy(info.type, ds1775 ? "wf_ds1775" : "wf_lm75", I2C_NAME_SIZE);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100148
Jean Delvare351ca3e2009-06-15 18:01:51 +0200149 client = i2c_new_device(adapter, &info);
150 if (client == NULL) {
151 printk(KERN_ERR "windfarm: failed to attach %s %s to i2c\n",
152 ds1775 ? "ds1775" : "lm75", name);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100153 goto fail;
154 }
155
Jean Delvare351ca3e2009-06-15 18:01:51 +0200156 /*
157 * Let i2c-core delete that device on driver removal.
158 * This is safe because i2c-core holds the core_lock mutex for us.
159 */
160 list_add_tail(&client->detected, &client->driver->clients);
161 return client;
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100162 fail:
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100163 return NULL;
164}
165
166static int wf_lm75_attach(struct i2c_adapter *adapter)
167{
Benjamin Herrenschmidta28d3af2006-01-07 11:35:26 +1100168 struct device_node *busnode, *dev;
169 struct pmac_i2c_bus *bus;
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100170
171 DBG("wf_lm75: adapter %s detected\n", adapter->name);
172
Benjamin Herrenschmidta28d3af2006-01-07 11:35:26 +1100173 bus = pmac_i2c_adapter_to_bus(adapter);
174 if (bus == NULL)
175 return -ENODEV;
176 busnode = pmac_i2c_get_bus_node(bus);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100177
178 DBG("wf_lm75: bus found, looking for device...\n");
179
180 /* Now look for lm75(s) in there */
181 for (dev = NULL;
Benjamin Herrenschmidta28d3af2006-01-07 11:35:26 +1100182 (dev = of_get_next_child(busnode, dev)) != NULL;) {
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100183 const char *loc =
Stephen Rothwell01b27262007-04-27 13:41:15 +1000184 of_get_property(dev, "hwsensor-location", NULL);
Benjamin Herrenschmidtb55fafc2006-03-03 17:03:21 +1100185 u8 addr;
186
187 /* We must re-match the adapter in order to properly check
188 * the channel on multibus setups
189 */
190 if (!pmac_i2c_match_adapter(dev, adapter))
191 continue;
192 addr = pmac_i2c_get_dev_addr(dev);
193 if (loc == NULL || addr == 0)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100194 continue;
195 /* real lm75 */
Stephen Rothwell55b61fe2007-05-03 17:26:52 +1000196 if (of_device_is_compatible(dev, "lm75"))
Benjamin Herrenschmidtb55fafc2006-03-03 17:03:21 +1100197 wf_lm75_create(adapter, addr, 0, loc);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100198 /* ds1775 (compatible, better resolution */
Stephen Rothwell55b61fe2007-05-03 17:26:52 +1000199 else if (of_device_is_compatible(dev, "ds1775"))
Benjamin Herrenschmidtb55fafc2006-03-03 17:03:21 +1100200 wf_lm75_create(adapter, addr, 1, loc);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100201 }
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100202 return 0;
203}
204
Jean Delvare351ca3e2009-06-15 18:01:51 +0200205static int wf_lm75_remove(struct i2c_client *client)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100206{
Jean Delvare351ca3e2009-06-15 18:01:51 +0200207 struct wf_lm75_sensor *lm = i2c_get_clientdata(client);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100208
209 DBG("wf_lm75: i2c detatch called for %s\n", lm->sens.name);
210
211 /* Mark client detached */
Jean Delvare351ca3e2009-06-15 18:01:51 +0200212 lm->i2c = NULL;
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100213
214 /* release sensor */
215 wf_unregister_sensor(&lm->sens);
216
Jean Delvare351ca3e2009-06-15 18:01:51 +0200217 i2c_set_clientdata(client, NULL);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100218 return 0;
219}
220
Jean Delvare351ca3e2009-06-15 18:01:51 +0200221static const struct i2c_device_id wf_lm75_id[] = {
222 { "wf_lm75", 0 },
223 { "wf_ds1775", 1 },
224 { }
225};
226
227static struct i2c_driver wf_lm75_driver = {
228 .driver = {
229 .name = "wf_lm75",
230 },
231 .attach_adapter = wf_lm75_attach,
232 .probe = wf_lm75_probe,
233 .remove = wf_lm75_remove,
234 .id_table = wf_lm75_id,
235};
236
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100237static int __init wf_lm75_sensor_init(void)
238{
Benjamin Herrenschmidtb55fafc2006-03-03 17:03:21 +1100239 /* Don't register on old machines that use therm_pm72 for now */
240 if (machine_is_compatible("PowerMac7,2") ||
241 machine_is_compatible("PowerMac7,3") ||
242 machine_is_compatible("RackMac3,1"))
243 return -ENODEV;
Arthur Othienoc9662b42006-01-06 00:11:29 -0800244 return i2c_add_driver(&wf_lm75_driver);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100245}
246
247static void __exit wf_lm75_sensor_exit(void)
248{
249 i2c_del_driver(&wf_lm75_driver);
250}
251
252
253module_init(wf_lm75_sensor_init);
254module_exit(wf_lm75_sensor_exit);
255
256MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
257MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control");
258MODULE_LICENSE("GPL");
259