8bb61fe1d0
wf_sensor.name is "const char *" Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
138 lines
3.1 KiB
C
138 lines
3.1 KiB
C
/*
|
|
* Windfarm PowerMac thermal control. MAX6690 sensor.
|
|
*
|
|
* Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org>
|
|
*
|
|
* Use and redistribute under the terms of the GNU GPL v2.
|
|
*/
|
|
#include <linux/types.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/i2c.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/pmac_low_i2c.h>
|
|
|
|
#include "windfarm.h"
|
|
|
|
#define VERSION "1.0"
|
|
|
|
/* This currently only exports the external temperature sensor,
|
|
since that's all the control loops need. */
|
|
|
|
/* Some MAX6690 register numbers */
|
|
#define MAX6690_INTERNAL_TEMP 0
|
|
#define MAX6690_EXTERNAL_TEMP 1
|
|
|
|
struct wf_6690_sensor {
|
|
struct i2c_client *i2c;
|
|
struct wf_sensor sens;
|
|
};
|
|
|
|
#define wf_to_6690(x) container_of((x), struct wf_6690_sensor, sens)
|
|
|
|
static int wf_max6690_get(struct wf_sensor *sr, s32 *value)
|
|
{
|
|
struct wf_6690_sensor *max = wf_to_6690(sr);
|
|
s32 data;
|
|
|
|
if (max->i2c == NULL)
|
|
return -ENODEV;
|
|
|
|
/* chip gets initialized by firmware */
|
|
data = i2c_smbus_read_byte_data(max->i2c, MAX6690_EXTERNAL_TEMP);
|
|
if (data < 0)
|
|
return data;
|
|
*value = data << 16;
|
|
return 0;
|
|
}
|
|
|
|
static void wf_max6690_release(struct wf_sensor *sr)
|
|
{
|
|
struct wf_6690_sensor *max = wf_to_6690(sr);
|
|
|
|
kfree(max);
|
|
}
|
|
|
|
static struct wf_sensor_ops wf_max6690_ops = {
|
|
.get_value = wf_max6690_get,
|
|
.release = wf_max6690_release,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int wf_max6690_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
const char *name, *loc;
|
|
struct wf_6690_sensor *max;
|
|
int rc;
|
|
|
|
loc = of_get_property(client->dev.of_node, "hwsensor-location", NULL);
|
|
if (!loc) {
|
|
dev_warn(&client->dev, "Missing hwsensor-location property!\n");
|
|
return -ENXIO;
|
|
}
|
|
|
|
/*
|
|
* We only expose the external temperature register for
|
|
* now as this is all we need for our control loops
|
|
*/
|
|
if (!strcmp(loc, "BACKSIDE") || !strcmp(loc, "SYS CTRLR AMBIENT"))
|
|
name = "backside-temp";
|
|
else if (!strcmp(loc, "NB Ambient"))
|
|
name = "north-bridge-temp";
|
|
else if (!strcmp(loc, "GPU Ambient"))
|
|
name = "gpu-temp";
|
|
else
|
|
return -ENXIO;
|
|
|
|
max = kzalloc(sizeof(struct wf_6690_sensor), GFP_KERNEL);
|
|
if (max == NULL) {
|
|
printk(KERN_ERR "windfarm: Couldn't create MAX6690 sensor: "
|
|
"no memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
max->i2c = client;
|
|
max->sens.name = name;
|
|
max->sens.ops = &wf_max6690_ops;
|
|
i2c_set_clientdata(client, max);
|
|
|
|
rc = wf_register_sensor(&max->sens);
|
|
if (rc)
|
|
kfree(max);
|
|
return rc;
|
|
}
|
|
|
|
static int wf_max6690_remove(struct i2c_client *client)
|
|
{
|
|
struct wf_6690_sensor *max = i2c_get_clientdata(client);
|
|
|
|
max->i2c = NULL;
|
|
wf_unregister_sensor(&max->sens);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id wf_max6690_id[] = {
|
|
{ "MAC,max6690", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, wf_max6690_id);
|
|
|
|
static struct i2c_driver wf_max6690_driver = {
|
|
.driver = {
|
|
.name = "wf_max6690",
|
|
},
|
|
.probe = wf_max6690_probe,
|
|
.remove = wf_max6690_remove,
|
|
.id_table = wf_max6690_id,
|
|
};
|
|
|
|
module_i2c_driver(wf_max6690_driver);
|
|
|
|
MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
|
|
MODULE_DESCRIPTION("MAX6690 sensor objects for PowerMac thermal control");
|
|
MODULE_LICENSE("GPL");
|