138 lines
3.1 KiB
C
138 lines
3.1 KiB
C
/*
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* Windfarm PowerMac thermal control. MAX6690 sensor.
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*
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* Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org>
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*
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* Use and redistribute under the terms of the GNU GPL v2.
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <asm/prom.h>
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#include <asm/pmac_low_i2c.h>
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#include "windfarm.h"
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#define VERSION "1.0"
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/* This currently only exports the external temperature sensor,
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since that's all the control loops need. */
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/* Some MAX6690 register numbers */
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#define MAX6690_INTERNAL_TEMP 0
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#define MAX6690_EXTERNAL_TEMP 1
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struct wf_6690_sensor {
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struct i2c_client *i2c;
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struct wf_sensor sens;
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};
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#define wf_to_6690(x) container_of((x), struct wf_6690_sensor, sens)
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static int wf_max6690_get(struct wf_sensor *sr, s32 *value)
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{
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struct wf_6690_sensor *max = wf_to_6690(sr);
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s32 data;
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if (max->i2c == NULL)
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return -ENODEV;
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/* chip gets initialized by firmware */
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data = i2c_smbus_read_byte_data(max->i2c, MAX6690_EXTERNAL_TEMP);
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if (data < 0)
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return data;
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*value = data << 16;
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return 0;
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}
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static void wf_max6690_release(struct wf_sensor *sr)
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{
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struct wf_6690_sensor *max = wf_to_6690(sr);
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kfree(max);
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}
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static struct wf_sensor_ops wf_max6690_ops = {
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.get_value = wf_max6690_get,
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.release = wf_max6690_release,
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.owner = THIS_MODULE,
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};
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static int wf_max6690_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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const char *name, *loc;
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struct wf_6690_sensor *max;
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int rc;
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loc = of_get_property(client->dev.of_node, "hwsensor-location", NULL);
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if (!loc) {
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dev_warn(&client->dev, "Missing hwsensor-location property!\n");
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return -ENXIO;
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}
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/*
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* We only expose the external temperature register for
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* now as this is all we need for our control loops
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*/
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if (!strcmp(loc, "BACKSIDE") || !strcmp(loc, "SYS CTRLR AMBIENT"))
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name = "backside-temp";
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else if (!strcmp(loc, "NB Ambient"))
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name = "north-bridge-temp";
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else if (!strcmp(loc, "GPU Ambient"))
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name = "gpu-temp";
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else
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return -ENXIO;
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max = kzalloc(sizeof(struct wf_6690_sensor), GFP_KERNEL);
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if (max == NULL) {
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printk(KERN_ERR "windfarm: Couldn't create MAX6690 sensor: "
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"no memory\n");
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return -ENOMEM;
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}
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max->i2c = client;
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max->sens.name = (char *)name; /* XXX fix constness in structure */
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max->sens.ops = &wf_max6690_ops;
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i2c_set_clientdata(client, max);
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rc = wf_register_sensor(&max->sens);
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if (rc)
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kfree(max);
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return rc;
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}
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static int wf_max6690_remove(struct i2c_client *client)
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{
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struct wf_6690_sensor *max = i2c_get_clientdata(client);
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max->i2c = NULL;
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wf_unregister_sensor(&max->sens);
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return 0;
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}
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static const struct i2c_device_id wf_max6690_id[] = {
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{ "MAC,max6690", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, wf_max6690_id);
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static struct i2c_driver wf_max6690_driver = {
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.driver = {
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.name = "wf_max6690",
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},
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.probe = wf_max6690_probe,
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.remove = wf_max6690_remove,
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.id_table = wf_max6690_id,
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};
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module_i2c_driver(wf_max6690_driver);
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MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
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MODULE_DESCRIPTION("MAX6690 sensor objects for PowerMac thermal control");
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MODULE_LICENSE("GPL");
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