Commit | Line | Data |
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ac171c46 BH |
1 | /* |
2 | * Windfarm PowerMac thermal control. MAX6690 sensor. | |
3 | * | |
4 | * Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org> | |
5 | * | |
6 | * Use and redistribute under the terms of the GNU GPL v2. | |
7 | */ | |
8 | #include <linux/types.h> | |
9 | #include <linux/errno.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/i2c.h> | |
ac171c46 BH |
14 | #include <asm/prom.h> |
15 | #include <asm/pmac_low_i2c.h> | |
16 | ||
17 | #include "windfarm.h" | |
18 | ||
b55fafc5 | 19 | #define VERSION "0.2" |
ac171c46 BH |
20 | |
21 | /* This currently only exports the external temperature sensor, | |
22 | since that's all the control loops need. */ | |
23 | ||
24 | /* Some MAX6690 register numbers */ | |
25 | #define MAX6690_INTERNAL_TEMP 0 | |
26 | #define MAX6690_EXTERNAL_TEMP 1 | |
27 | ||
28 | struct wf_6690_sensor { | |
351ca3e3 | 29 | struct i2c_client *i2c; |
ac171c46 BH |
30 | struct wf_sensor sens; |
31 | }; | |
32 | ||
33 | #define wf_to_6690(x) container_of((x), struct wf_6690_sensor, sens) | |
ac171c46 BH |
34 | |
35 | static int wf_max6690_get(struct wf_sensor *sr, s32 *value) | |
36 | { | |
37 | struct wf_6690_sensor *max = wf_to_6690(sr); | |
38 | s32 data; | |
39 | ||
351ca3e3 | 40 | if (max->i2c == NULL) |
ac171c46 BH |
41 | return -ENODEV; |
42 | ||
43 | /* chip gets initialized by firmware */ | |
351ca3e3 | 44 | data = i2c_smbus_read_byte_data(max->i2c, MAX6690_EXTERNAL_TEMP); |
ac171c46 BH |
45 | if (data < 0) |
46 | return data; | |
47 | *value = data << 16; | |
48 | return 0; | |
49 | } | |
50 | ||
51 | static void wf_max6690_release(struct wf_sensor *sr) | |
52 | { | |
53 | struct wf_6690_sensor *max = wf_to_6690(sr); | |
54 | ||
ac171c46 BH |
55 | kfree(max); |
56 | } | |
57 | ||
58 | static struct wf_sensor_ops wf_max6690_ops = { | |
59 | .get_value = wf_max6690_get, | |
60 | .release = wf_max6690_release, | |
61 | .owner = THIS_MODULE, | |
62 | }; | |
63 | ||
351ca3e3 JD |
64 | static int wf_max6690_probe(struct i2c_client *client, |
65 | const struct i2c_device_id *id) | |
ac171c46 BH |
66 | { |
67 | struct wf_6690_sensor *max; | |
351ca3e3 | 68 | int rc; |
ac171c46 BH |
69 | |
70 | max = kzalloc(sizeof(struct wf_6690_sensor), GFP_KERNEL); | |
71 | if (max == NULL) { | |
351ca3e3 JD |
72 | printk(KERN_ERR "windfarm: Couldn't create MAX6690 sensor: " |
73 | "no memory\n"); | |
74 | return -ENOMEM; | |
75 | } | |
76 | ||
77 | max->i2c = client; | |
78 | max->sens.name = client->dev.platform_data; | |
79 | max->sens.ops = &wf_max6690_ops; | |
80 | i2c_set_clientdata(client, max); | |
81 | ||
82 | rc = wf_register_sensor(&max->sens); | |
83 | if (rc) { | |
84 | i2c_set_clientdata(client, NULL); | |
85 | kfree(max); | |
ac171c46 BH |
86 | } |
87 | ||
351ca3e3 JD |
88 | return rc; |
89 | } | |
90 | ||
6f6b35e1 JD |
91 | static struct i2c_driver wf_max6690_driver; |
92 | ||
351ca3e3 JD |
93 | static struct i2c_client *wf_max6690_create(struct i2c_adapter *adapter, |
94 | u8 addr, const char *loc) | |
95 | { | |
96 | struct i2c_board_info info; | |
97 | struct i2c_client *client; | |
98 | char *name; | |
99 | ||
80ff974d ÉB |
100 | if (!strcmp(loc, "BACKSIDE")) |
101 | name = "backside-temp"; | |
102 | else if (!strcmp(loc, "NB Ambient")) | |
103 | name = "north-bridge-temp"; | |
104 | else if (!strcmp(loc, "GPU Ambient")) | |
105 | name = "gpu-temp"; | |
106 | else | |
107 | goto fail; | |
108 | ||
351ca3e3 JD |
109 | memset(&info, 0, sizeof(struct i2c_board_info)); |
110 | info.addr = addr >> 1; | |
111 | info.platform_data = name; | |
112 | strlcpy(info.type, "wf_max6690", I2C_NAME_SIZE); | |
ac171c46 | 113 | |
351ca3e3 JD |
114 | client = i2c_new_device(adapter, &info); |
115 | if (client == NULL) { | |
ac171c46 BH |
116 | printk(KERN_ERR "windfarm: failed to attach MAX6690 sensor\n"); |
117 | goto fail; | |
118 | } | |
119 | ||
351ca3e3 JD |
120 | /* |
121 | * Let i2c-core delete that device on driver removal. | |
122 | * This is safe because i2c-core holds the core_lock mutex for us. | |
123 | */ | |
6f6b35e1 | 124 | list_add_tail(&client->detected, &wf_max6690_driver.clients); |
351ca3e3 | 125 | return client; |
ac171c46 BH |
126 | |
127 | fail: | |
351ca3e3 | 128 | return NULL; |
ac171c46 BH |
129 | } |
130 | ||
131 | static int wf_max6690_attach(struct i2c_adapter *adapter) | |
132 | { | |
133 | struct device_node *busnode, *dev = NULL; | |
134 | struct pmac_i2c_bus *bus; | |
135 | const char *loc; | |
ac171c46 BH |
136 | |
137 | bus = pmac_i2c_adapter_to_bus(adapter); | |
138 | if (bus == NULL) | |
139 | return -ENODEV; | |
140 | busnode = pmac_i2c_get_bus_node(bus); | |
141 | ||
142 | while ((dev = of_get_next_child(busnode, dev)) != NULL) { | |
b55fafc5 BH |
143 | u8 addr; |
144 | ||
145 | /* We must re-match the adapter in order to properly check | |
146 | * the channel on multibus setups | |
147 | */ | |
148 | if (!pmac_i2c_match_adapter(dev, adapter)) | |
149 | continue; | |
55b61fec | 150 | if (!of_device_is_compatible(dev, "max6690")) |
ac171c46 | 151 | continue; |
b55fafc5 | 152 | addr = pmac_i2c_get_dev_addr(dev); |
01b2726d | 153 | loc = of_get_property(dev, "hwsensor-location", NULL); |
b55fafc5 | 154 | if (loc == NULL || addr == 0) |
ac171c46 | 155 | continue; |
b55fafc5 | 156 | printk("found max6690, loc=%s addr=0x%02x\n", loc, addr); |
80ff974d | 157 | wf_max6690_create(adapter, addr, loc); |
ac171c46 BH |
158 | } |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
351ca3e3 | 163 | static int wf_max6690_remove(struct i2c_client *client) |
ac171c46 | 164 | { |
351ca3e3 | 165 | struct wf_6690_sensor *max = i2c_get_clientdata(client); |
ac171c46 | 166 | |
351ca3e3 | 167 | max->i2c = NULL; |
ac171c46 BH |
168 | wf_unregister_sensor(&max->sens); |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
351ca3e3 JD |
173 | static const struct i2c_device_id wf_max6690_id[] = { |
174 | { "wf_max6690", 0 }, | |
175 | { } | |
176 | }; | |
177 | ||
178 | static struct i2c_driver wf_max6690_driver = { | |
179 | .driver = { | |
180 | .name = "wf_max6690", | |
181 | }, | |
182 | .attach_adapter = wf_max6690_attach, | |
183 | .probe = wf_max6690_probe, | |
184 | .remove = wf_max6690_remove, | |
185 | .id_table = wf_max6690_id, | |
186 | }; | |
187 | ||
ac171c46 BH |
188 | static int __init wf_max6690_sensor_init(void) |
189 | { | |
b55fafc5 BH |
190 | /* Don't register on old machines that use therm_pm72 for now */ |
191 | if (machine_is_compatible("PowerMac7,2") || | |
192 | machine_is_compatible("PowerMac7,3") || | |
193 | machine_is_compatible("RackMac3,1")) | |
194 | return -ENODEV; | |
ac171c46 BH |
195 | return i2c_add_driver(&wf_max6690_driver); |
196 | } | |
197 | ||
198 | static void __exit wf_max6690_sensor_exit(void) | |
199 | { | |
200 | i2c_del_driver(&wf_max6690_driver); | |
201 | } | |
202 | ||
203 | module_init(wf_max6690_sensor_init); | |
204 | module_exit(wf_max6690_sensor_exit); | |
205 | ||
206 | MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>"); | |
207 | MODULE_DESCRIPTION("MAX6690 sensor objects for PowerMac thermal control"); | |
208 | MODULE_LICENSE("GPL"); |