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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
36struct 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
44static 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
78static 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
85static 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
91static 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
146static 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
161static const struct i2c_device_id wf_lm75_id[] = {
162 { "MAC,lm75", 0 },
163 { "MAC,ds1775", 1 },
164 { }
165};
166MODULE_DEVICE_TABLE(i2c, wf_lm75_id);
167
168static 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
177module_i2c_driver(wf_lm75_driver);
178
179MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
180MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control");
181MODULE_LICENSE("GPL");
182
183

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