video: tegra: host: module debugger framework
[linux-3.10.git] / drivers / macintosh / windfarm_lm75_sensor.c
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 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 = (char *)name; /* XXX fix constness in structure */
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