linux/drivers/macintosh/windfarm_lm75_sensor.c
Benjamin Herrenschmidt d839ba2ab2 powerpc/windfarm: Updates to lm75 and max6690 sensors
This allows those modules to load on PowerMac7,2 PowerMac7,3
and RackMac3,1 and add the sensor name conversion for those
machines.

This will be used by the corresponding new windfarm modules
for those machines.

Note that since therm_pm72 is linked first, it will still
take priority on those i2c devices if built-in. If using modules
it will depend which is loaded first, but you should avoid building
therm_pm72 if you are using the new windfarm drivers

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2012-04-30 15:37:24 +10:00

194 lines
4.2 KiB
C

/*
* Windfarm PowerMac thermal control. LM75 sensor
*
* (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
* <benh@kernel.crashing.org>
*
* Released under the term of the GNU GPL v2.
*/
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/i2c.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/sections.h>
#include <asm/pmac_low_i2c.h>
#include "windfarm.h"
#define VERSION "1.0"
#undef DEBUG
#ifdef DEBUG
#define DBG(args...) printk(args)
#else
#define DBG(args...) do { } while(0)
#endif
struct wf_lm75_sensor {
int ds1775 : 1;
int inited : 1;
struct i2c_client *i2c;
struct wf_sensor sens;
};
#define wf_to_lm75(c) container_of(c, struct wf_lm75_sensor, sens)
static int wf_lm75_get(struct wf_sensor *sr, s32 *value)
{
struct wf_lm75_sensor *lm = wf_to_lm75(sr);
s32 data;
if (lm->i2c == NULL)
return -ENODEV;
/* Init chip if necessary */
if (!lm->inited) {
u8 cfg_new, cfg = (u8)i2c_smbus_read_byte_data(lm->i2c, 1);
DBG("wf_lm75: Initializing %s, cfg was: %02x\n",
sr->name, cfg);
/* clear shutdown bit, keep other settings as left by
* the firmware for now
*/
cfg_new = cfg & ~0x01;
i2c_smbus_write_byte_data(lm->i2c, 1, cfg_new);
lm->inited = 1;
/* If we just powered it up, let's wait 200 ms */
msleep(200);
}
/* Read temperature register */
data = (s32)le16_to_cpu(i2c_smbus_read_word_data(lm->i2c, 0));
data <<= 8;
*value = data;
return 0;
}
static void wf_lm75_release(struct wf_sensor *sr)
{
struct wf_lm75_sensor *lm = wf_to_lm75(sr);
kfree(lm);
}
static struct wf_sensor_ops wf_lm75_ops = {
.get_value = wf_lm75_get,
.release = wf_lm75_release,
.owner = THIS_MODULE,
};
static int wf_lm75_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct wf_lm75_sensor *lm;
int rc, ds1775 = id->driver_data;
const char *name, *loc;
DBG("wf_lm75: creating %s device at address 0x%02x\n",
ds1775 ? "ds1775" : "lm75", client->addr);
loc = of_get_property(client->dev.of_node, "hwsensor-location", NULL);
if (!loc) {
dev_warn(&client->dev, "Missing hwsensor-location property!\n");
return -ENXIO;
}
/* Usual rant about sensor names not beeing very consistent in
* the device-tree, oh well ...
* Add more entries below as you deal with more setups
*/
if (!strcmp(loc, "Hard drive") || !strcmp(loc, "DRIVE BAY"))
name = "hd-temp";
else if (!strcmp(loc, "Incoming Air Temp"))
name = "incoming-air-temp";
else if (!strcmp(loc, "ODD Temp"))
name = "optical-drive-temp";
else if (!strcmp(loc, "HD Temp"))
name = "hard-drive-temp";
else if (!strcmp(loc, "PCI SLOTS"))
name = "slots-temp";
else if (!strcmp(loc, "CPU A INLET"))
name = "cpu-inlet-temp-0";
else if (!strcmp(loc, "CPU B INLET"))
name = "cpu-inlet-temp-1";
else
return -ENXIO;
lm = kzalloc(sizeof(struct wf_lm75_sensor), GFP_KERNEL);
if (lm == NULL)
return -ENODEV;
lm->inited = 0;
lm->ds1775 = ds1775;
lm->i2c = client;
lm->sens.name = (char *)name; /* XXX fix constness in structure */
lm->sens.ops = &wf_lm75_ops;
i2c_set_clientdata(client, lm);
rc = wf_register_sensor(&lm->sens);
if (rc)
kfree(lm);
return rc;
}
static int wf_lm75_remove(struct i2c_client *client)
{
struct wf_lm75_sensor *lm = i2c_get_clientdata(client);
DBG("wf_lm75: i2c detatch called for %s\n", lm->sens.name);
/* Mark client detached */
lm->i2c = NULL;
/* release sensor */
wf_unregister_sensor(&lm->sens);
return 0;
}
static const struct i2c_device_id wf_lm75_id[] = {
{ "MAC,lm75", 0 },
{ "MAC,ds1775", 1 },
{ }
};
MODULE_DEVICE_TABLE(i2c, wf_lm75_id);
static struct i2c_driver wf_lm75_driver = {
.driver = {
.name = "wf_lm75",
},
.probe = wf_lm75_probe,
.remove = wf_lm75_remove,
.id_table = wf_lm75_id,
};
static int __init wf_lm75_sensor_init(void)
{
return i2c_add_driver(&wf_lm75_driver);
}
static void __exit wf_lm75_sensor_exit(void)
{
i2c_del_driver(&wf_lm75_driver);
}
module_init(wf_lm75_sensor_init);
module_exit(wf_lm75_sensor_exit);
MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control");
MODULE_LICENSE("GPL");