Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[drm/drm-misc.git] / drivers / macintosh / windfarm_lm75_sensor.c
blobb5d9c2e40148ca57231cc06064d3333a6b802179
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Windfarm PowerMac thermal control. LM75 sensor
5 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
6 * <benh@kernel.crashing.org>
7 */
9 #include <linux/types.h>
10 #include <linux/errno.h>
11 #include <linux/kernel.h>
12 #include <linux/delay.h>
13 #include <linux/slab.h>
14 #include <linux/init.h>
15 #include <linux/wait.h>
16 #include <linux/i2c.h>
17 #include <linux/of.h>
18 #include <asm/machdep.h>
19 #include <asm/io.h>
20 #include <asm/sections.h>
21 #include <asm/pmac_low_i2c.h>
23 #include "windfarm.h"
25 #define VERSION "1.0"
27 #undef DEBUG
29 #ifdef DEBUG
30 #define DBG(args...) printk(args)
31 #else
32 #define DBG(args...) do { } while(0)
33 #endif
35 struct wf_lm75_sensor {
36 unsigned int ds1775 : 1;
37 unsigned int inited : 1;
38 struct i2c_client *i2c;
39 struct wf_sensor sens;
41 #define wf_to_lm75(c) container_of(c, struct wf_lm75_sensor, sens)
43 static int wf_lm75_get(struct wf_sensor *sr, s32 *value)
45 struct wf_lm75_sensor *lm = wf_to_lm75(sr);
46 s32 data;
48 if (lm->i2c == NULL)
49 return -ENODEV;
51 /* Init chip if necessary */
52 if (!lm->inited) {
53 u8 cfg_new, cfg = (u8)i2c_smbus_read_byte_data(lm->i2c, 1);
55 DBG("wf_lm75: Initializing %s, cfg was: %02x\n",
56 sr->name, cfg);
58 /* clear shutdown bit, keep other settings as left by
59 * the firmware for now
61 cfg_new = cfg & ~0x01;
62 i2c_smbus_write_byte_data(lm->i2c, 1, cfg_new);
63 lm->inited = 1;
65 /* If we just powered it up, let's wait 200 ms */
66 msleep(200);
69 /* Read temperature register */
70 data = (s32)le16_to_cpu(i2c_smbus_read_word_data(lm->i2c, 0));
71 data <<= 8;
72 *value = data;
74 return 0;
77 static void wf_lm75_release(struct wf_sensor *sr)
79 struct wf_lm75_sensor *lm = wf_to_lm75(sr);
81 kfree(lm);
84 static const struct wf_sensor_ops wf_lm75_ops = {
85 .get_value = wf_lm75_get,
86 .release = wf_lm75_release,
87 .owner = THIS_MODULE,
90 static int wf_lm75_probe(struct i2c_client *client)
92 const struct i2c_device_id *id = i2c_client_get_device_id(client);
93 struct wf_lm75_sensor *lm;
94 int rc, ds1775;
95 const char *name, *loc;
97 if (id)
98 ds1775 = id->driver_data;
99 else
100 ds1775 = !!of_device_get_match_data(&client->dev);
102 DBG("wf_lm75: creating %s device at address 0x%02x\n",
103 ds1775 ? "ds1775" : "lm75", client->addr);
105 loc = of_get_property(client->dev.of_node, "hwsensor-location", NULL);
106 if (!loc) {
107 dev_warn(&client->dev, "Missing hwsensor-location property!\n");
108 return -ENXIO;
111 /* Usual rant about sensor names not beeing very consistent in
112 * the device-tree, oh well ...
113 * Add more entries below as you deal with more setups
115 if (!strcmp(loc, "Hard drive") || !strcmp(loc, "DRIVE BAY"))
116 name = "hd-temp";
117 else if (!strcmp(loc, "Incoming Air Temp"))
118 name = "incoming-air-temp";
119 else if (!strcmp(loc, "ODD Temp"))
120 name = "optical-drive-temp";
121 else if (!strcmp(loc, "HD Temp"))
122 name = "hard-drive-temp";
123 else if (!strcmp(loc, "PCI SLOTS"))
124 name = "slots-temp";
125 else if (!strcmp(loc, "CPU A INLET"))
126 name = "cpu-inlet-temp-0";
127 else if (!strcmp(loc, "CPU B INLET"))
128 name = "cpu-inlet-temp-1";
129 else
130 return -ENXIO;
133 lm = kzalloc(sizeof(struct wf_lm75_sensor), GFP_KERNEL);
134 if (lm == NULL)
135 return -ENODEV;
137 lm->inited = 0;
138 lm->ds1775 = ds1775;
139 lm->i2c = client;
140 lm->sens.name = name;
141 lm->sens.ops = &wf_lm75_ops;
142 i2c_set_clientdata(client, lm);
144 rc = wf_register_sensor(&lm->sens);
145 if (rc)
146 kfree(lm);
147 return rc;
150 static void wf_lm75_remove(struct i2c_client *client)
152 struct wf_lm75_sensor *lm = i2c_get_clientdata(client);
154 /* Mark client detached */
155 lm->i2c = NULL;
157 /* release sensor */
158 wf_unregister_sensor(&lm->sens);
161 static const struct i2c_device_id wf_lm75_id[] = {
162 { "MAC,lm75", 0 },
163 { "MAC,ds1775", 1 },
166 MODULE_DEVICE_TABLE(i2c, wf_lm75_id);
168 static const struct of_device_id wf_lm75_of_id[] = {
169 { .compatible = "lm75", .data = (void *)0},
170 { .compatible = "ds1775", .data = (void *)1 },
173 MODULE_DEVICE_TABLE(of, wf_lm75_of_id);
175 static struct i2c_driver wf_lm75_driver = {
176 .driver = {
177 .name = "wf_lm75",
178 .of_match_table = wf_lm75_of_id,
180 .probe = wf_lm75_probe,
181 .remove = wf_lm75_remove,
182 .id_table = wf_lm75_id,
185 module_i2c_driver(wf_lm75_driver);
187 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
188 MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control");
189 MODULE_LICENSE("GPL");