Warning: That file was not part of the compilation database. It may have many parsing errors.
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/sections.h> |
22 | #include <asm/pmac_low_i2c.h> |
23 | |
24 | #include "windfarm.h" |
25 | |
26 | #define VERSION "1.0" |
27 | |
28 | #undef DEBUG |
29 | |
30 | #ifdef DEBUG |
31 | #define DBG(args...) printk(args) |
32 | #else |
33 | #define DBG(args...) do { } while(0) |
34 | #endif |
35 | |
36 | struct wf_lm75_sensor { |
37 | int ds1775 : 1; |
38 | int inited : 1; |
39 | struct i2c_client *i2c; |
40 | struct wf_sensor sens; |
41 | }; |
42 | #define wf_to_lm75(c) container_of(c, struct wf_lm75_sensor, sens) |
43 | |
44 | static int wf_lm75_get(struct wf_sensor *sr, s32 *value) |
45 | { |
46 | struct wf_lm75_sensor *lm = wf_to_lm75(sr); |
47 | s32 data; |
48 | |
49 | if (lm->i2c == NULL) |
50 | return -ENODEV; |
51 | |
52 | /* Init chip if necessary */ |
53 | if (!lm->inited) { |
54 | u8 cfg_new, cfg = (u8)i2c_smbus_read_byte_data(lm->i2c, 1); |
55 | |
56 | DBG("wf_lm75: Initializing %s, cfg was: %02x\n", |
57 | sr->name, cfg); |
58 | |
59 | /* clear shutdown bit, keep other settings as left by |
60 | * the firmware for now |
61 | */ |
62 | cfg_new = cfg & ~0x01; |
63 | i2c_smbus_write_byte_data(lm->i2c, 1, cfg_new); |
64 | lm->inited = 1; |
65 | |
66 | /* If we just powered it up, let's wait 200 ms */ |
67 | msleep(200); |
68 | } |
69 | |
70 | /* Read temperature register */ |
71 | data = (s32)le16_to_cpu(i2c_smbus_read_word_data(lm->i2c, 0)); |
72 | data <<= 8; |
73 | *value = data; |
74 | |
75 | return 0; |
76 | } |
77 | |
78 | static void wf_lm75_release(struct wf_sensor *sr) |
79 | { |
80 | struct wf_lm75_sensor *lm = wf_to_lm75(sr); |
81 | |
82 | kfree(lm); |
83 | } |
84 | |
85 | static const struct wf_sensor_ops wf_lm75_ops = { |
86 | .get_value = wf_lm75_get, |
87 | .release = wf_lm75_release, |
88 | .owner = THIS_MODULE, |
89 | }; |
90 | |
91 | static int wf_lm75_probe(struct i2c_client *client, |
92 | const struct i2c_device_id *id) |
93 | { |
94 | struct wf_lm75_sensor *lm; |
95 | int rc, ds1775 = id->driver_data; |
96 | const char *name, *loc; |
97 | |
98 | DBG("wf_lm75: creating %s device at address 0x%02x\n", |
99 | ds1775 ? "ds1775": "lm75", client->addr); |
100 | |
101 | loc = of_get_property(client->dev.of_node, "hwsensor-location", NULL); |
102 | if (!loc) { |
103 | dev_warn(&client->dev, "Missing hwsensor-location property!\n"); |
104 | return -ENXIO; |
105 | } |
106 | |
107 | /* Usual rant about sensor names not beeing very consistent in |
108 | * the device-tree, oh well ... |
109 | * Add more entries below as you deal with more setups |
110 | */ |
111 | if (!strcmp(loc, "Hard drive") || !strcmp(loc, "DRIVE BAY")) |
112 | name = "hd-temp"; |
113 | else if (!strcmp(loc, "Incoming Air Temp")) |
114 | name = "incoming-air-temp"; |
115 | else if (!strcmp(loc, "ODD Temp")) |
116 | name = "optical-drive-temp"; |
117 | else if (!strcmp(loc, "HD Temp")) |
118 | name = "hard-drive-temp"; |
119 | else if (!strcmp(loc, "PCI SLOTS")) |
120 | name = "slots-temp"; |
121 | else if (!strcmp(loc, "CPU A INLET")) |
122 | name = "cpu-inlet-temp-0"; |
123 | else if (!strcmp(loc, "CPU B INLET")) |
124 | name = "cpu-inlet-temp-1"; |
125 | else |
126 | return -ENXIO; |
127 | |
128 | |
129 | lm = kzalloc(sizeof(struct wf_lm75_sensor), GFP_KERNEL); |
130 | if (lm == NULL) |
131 | return -ENODEV; |
132 | |
133 | lm->inited = 0; |
134 | lm->ds1775 = ds1775; |
135 | lm->i2c = client; |
136 | lm->sens.name = name; |
137 | lm->sens.ops = &wf_lm75_ops; |
138 | i2c_set_clientdata(client, lm); |
139 | |
140 | rc = wf_register_sensor(&lm->sens); |
141 | if (rc) |
142 | kfree(lm); |
143 | return rc; |
144 | } |
145 | |
146 | static int wf_lm75_remove(struct i2c_client *client) |
147 | { |
148 | struct wf_lm75_sensor *lm = i2c_get_clientdata(client); |
149 | |
150 | DBG("wf_lm75: i2c detatch called for %s\n", lm->sens.name); |
151 | |
152 | /* Mark client detached */ |
153 | lm->i2c = NULL; |
154 | |
155 | /* release sensor */ |
156 | wf_unregister_sensor(&lm->sens); |
157 | |
158 | return 0; |
159 | } |
160 | |
161 | static const struct i2c_device_id wf_lm75_id[] = { |
162 | { "MAC,lm75", 0 }, |
163 | { "MAC,ds1775", 1 }, |
164 | { } |
165 | }; |
166 | MODULE_DEVICE_TABLE(i2c, wf_lm75_id); |
167 | |
168 | static struct i2c_driver wf_lm75_driver = { |
169 | .driver = { |
170 | .name = "wf_lm75", |
171 | }, |
172 | .probe = wf_lm75_probe, |
173 | .remove = wf_lm75_remove, |
174 | .id_table = wf_lm75_id, |
175 | }; |
176 | |
177 | module_i2c_driver(wf_lm75_driver); |
178 | |
179 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); |
180 | MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control"); |
181 | MODULE_LICENSE("GPL"); |
182 | |
183 |
Warning: That file was not part of the compilation database. It may have many parsing errors.