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75722d39 BH |
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> | |
75722d39 BH |
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> | |
a28d3af2 | 23 | #include <asm/pmac_low_i2c.h> |
75722d39 BH |
24 | |
25 | #include "windfarm.h" | |
26 | ||
b55fafc5 | 27 | #define VERSION "0.2" |
75722d39 BH |
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; | |
351ca3e3 | 40 | struct i2c_client *i2c; |
75722d39 BH |
41 | struct wf_sensor sens; |
42 | }; | |
43 | #define wf_to_lm75(c) container_of(c, struct wf_lm75_sensor, sens) | |
75722d39 BH |
44 | |
45 | static 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 | ||
351ca3e3 | 50 | if (lm->i2c == NULL) |
75722d39 BH |
51 | return -ENODEV; |
52 | ||
53 | /* Init chip if necessary */ | |
54 | if (!lm->inited) { | |
351ca3e3 | 55 | u8 cfg_new, cfg = (u8)i2c_smbus_read_byte_data(lm->i2c, 1); |
75722d39 BH |
56 | |
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; | |
351ca3e3 | 64 | i2c_smbus_write_byte_data(lm->i2c, 1, cfg_new); |
75722d39 BH |
65 | 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 */ | |
351ca3e3 | 72 | data = (s32)le16_to_cpu(i2c_smbus_read_word_data(lm->i2c, 0)); |
75722d39 BH |
73 | data <<= 8; |
74 | *value = data; | |
75 | ||
76 | return 0; | |
77 | } | |
78 | ||
79 | static void wf_lm75_release(struct wf_sensor *sr) | |
80 | { | |
81 | struct wf_lm75_sensor *lm = wf_to_lm75(sr); | |
82 | ||
75722d39 BH |
83 | kfree(lm); |
84 | } | |
85 | ||
86 | static struct wf_sensor_ops wf_lm75_ops = { | |
87 | .get_value = wf_lm75_get, | |
88 | .release = wf_lm75_release, | |
89 | .owner = THIS_MODULE, | |
90 | }; | |
91 | ||
351ca3e3 JD |
92 | static int wf_lm75_probe(struct i2c_client *client, |
93 | const struct i2c_device_id *id) | |
75722d39 BH |
94 | { |
95 | struct wf_lm75_sensor *lm; | |
b55fafc5 | 96 | int rc; |
75722d39 | 97 | |
dd00cc48 | 98 | lm = kzalloc(sizeof(struct wf_lm75_sensor), GFP_KERNEL); |
75722d39 | 99 | if (lm == NULL) |
351ca3e3 JD |
100 | 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 | ||
6f6b35e1 JD |
118 | static struct i2c_driver wf_lm75_driver; |
119 | ||
351ca3e3 JD |
120 | static struct i2c_client *wf_lm75_create(struct i2c_adapter *adapter, |
121 | u8 addr, int ds1775, | |
122 | const char *loc) | |
123 | { | |
124 | struct i2c_board_info info; | |
125 | struct i2c_client *client; | |
126 | char *name; | |
127 | ||
128 | DBG("wf_lm75: creating %s device at address 0x%02x\n", | |
129 | ds1775 ? "ds1775" : "lm75", addr); | |
75722d39 BH |
130 | |
131 | /* Usual rant about sensor names not beeing very consistent in | |
132 | * the device-tree, oh well ... | |
133 | * Add more entries below as you deal with more setups | |
134 | */ | |
135 | if (!strcmp(loc, "Hard drive") || !strcmp(loc, "DRIVE BAY")) | |
351ca3e3 | 136 | name = "hd-temp"; |
80ff974d | 137 | else if (!strcmp(loc, "Incoming Air Temp")) |
351ca3e3 | 138 | name = "incoming-air-temp"; |
80ff974d | 139 | else if (!strcmp(loc, "ODD Temp")) |
351ca3e3 | 140 | name = "optical-drive-temp"; |
80ff974d | 141 | else if (!strcmp(loc, "HD Temp")) |
351ca3e3 | 142 | name = "hard-drive-temp"; |
75722d39 BH |
143 | else |
144 | goto fail; | |
145 | ||
351ca3e3 JD |
146 | memset(&info, 0, sizeof(struct i2c_board_info)); |
147 | info.addr = (addr >> 1) & 0x7f; | |
148 | info.platform_data = name; | |
149 | strlcpy(info.type, ds1775 ? "wf_ds1775" : "wf_lm75", I2C_NAME_SIZE); | |
75722d39 | 150 | |
351ca3e3 JD |
151 | client = i2c_new_device(adapter, &info); |
152 | if (client == NULL) { | |
153 | printk(KERN_ERR "windfarm: failed to attach %s %s to i2c\n", | |
154 | ds1775 ? "ds1775" : "lm75", name); | |
75722d39 BH |
155 | goto fail; |
156 | } | |
157 | ||
351ca3e3 JD |
158 | /* |
159 | * Let i2c-core delete that device on driver removal. | |
160 | * This is safe because i2c-core holds the core_lock mutex for us. | |
161 | */ | |
6f6b35e1 | 162 | list_add_tail(&client->detected, &wf_lm75_driver.clients); |
351ca3e3 | 163 | return client; |
75722d39 | 164 | fail: |
75722d39 BH |
165 | return NULL; |
166 | } | |
167 | ||
168 | static int wf_lm75_attach(struct i2c_adapter *adapter) | |
169 | { | |
a28d3af2 BH |
170 | struct device_node *busnode, *dev; |
171 | struct pmac_i2c_bus *bus; | |
75722d39 BH |
172 | |
173 | DBG("wf_lm75: adapter %s detected\n", adapter->name); | |
174 | ||
a28d3af2 BH |
175 | bus = pmac_i2c_adapter_to_bus(adapter); |
176 | if (bus == NULL) | |
177 | return -ENODEV; | |
178 | busnode = pmac_i2c_get_bus_node(bus); | |
75722d39 BH |
179 | |
180 | DBG("wf_lm75: bus found, looking for device...\n"); | |
181 | ||
182 | /* Now look for lm75(s) in there */ | |
183 | for (dev = NULL; | |
a28d3af2 | 184 | (dev = of_get_next_child(busnode, dev)) != NULL;) { |
75722d39 | 185 | const char *loc = |
01b2726d | 186 | of_get_property(dev, "hwsensor-location", NULL); |
b55fafc5 BH |
187 | u8 addr; |
188 | ||
189 | /* We must re-match the adapter in order to properly check | |
190 | * the channel on multibus setups | |
191 | */ | |
192 | if (!pmac_i2c_match_adapter(dev, adapter)) | |
193 | continue; | |
194 | addr = pmac_i2c_get_dev_addr(dev); | |
195 | if (loc == NULL || addr == 0) | |
75722d39 BH |
196 | continue; |
197 | /* real lm75 */ | |
55b61fec | 198 | if (of_device_is_compatible(dev, "lm75")) |
b55fafc5 | 199 | wf_lm75_create(adapter, addr, 0, loc); |
75722d39 | 200 | /* ds1775 (compatible, better resolution */ |
55b61fec | 201 | else if (of_device_is_compatible(dev, "ds1775")) |
b55fafc5 | 202 | wf_lm75_create(adapter, addr, 1, loc); |
75722d39 | 203 | } |
75722d39 BH |
204 | return 0; |
205 | } | |
206 | ||
351ca3e3 | 207 | static int wf_lm75_remove(struct i2c_client *client) |
75722d39 | 208 | { |
351ca3e3 | 209 | struct wf_lm75_sensor *lm = i2c_get_clientdata(client); |
75722d39 BH |
210 | |
211 | DBG("wf_lm75: i2c detatch called for %s\n", lm->sens.name); | |
212 | ||
213 | /* Mark client detached */ | |
351ca3e3 | 214 | lm->i2c = NULL; |
75722d39 BH |
215 | |
216 | /* release sensor */ | |
217 | wf_unregister_sensor(&lm->sens); | |
218 | ||
351ca3e3 | 219 | i2c_set_clientdata(client, NULL); |
75722d39 BH |
220 | return 0; |
221 | } | |
222 | ||
351ca3e3 JD |
223 | static const struct i2c_device_id wf_lm75_id[] = { |
224 | { "wf_lm75", 0 }, | |
225 | { "wf_ds1775", 1 }, | |
226 | { } | |
227 | }; | |
228 | ||
229 | static struct i2c_driver wf_lm75_driver = { | |
230 | .driver = { | |
231 | .name = "wf_lm75", | |
232 | }, | |
233 | .attach_adapter = wf_lm75_attach, | |
234 | .probe = wf_lm75_probe, | |
235 | .remove = wf_lm75_remove, | |
236 | .id_table = wf_lm75_id, | |
237 | }; | |
238 | ||
75722d39 BH |
239 | static int __init wf_lm75_sensor_init(void) |
240 | { | |
b55fafc5 | 241 | /* Don't register on old machines that use therm_pm72 for now */ |
71a157e8 GL |
242 | if (of_machine_is_compatible("PowerMac7,2") || |
243 | of_machine_is_compatible("PowerMac7,3") || | |
244 | of_machine_is_compatible("RackMac3,1")) | |
b55fafc5 | 245 | return -ENODEV; |
c9662b4b | 246 | return i2c_add_driver(&wf_lm75_driver); |
75722d39 BH |
247 | } |
248 | ||
249 | static void __exit wf_lm75_sensor_exit(void) | |
250 | { | |
251 | i2c_del_driver(&wf_lm75_driver); | |
252 | } | |
253 | ||
254 | ||
255 | module_init(wf_lm75_sensor_init); | |
256 | module_exit(wf_lm75_sensor_exit); | |
257 | ||
258 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
259 | MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control"); | |
260 | MODULE_LICENSE("GPL"); | |
261 |