mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-11-26 03:24:10 +08:00
powerpc/windfarm: Add lm87 sensor
For use by the upcoming windfarm_rm31 Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt
parent
850dc32168
commit
08fe5bc75f
201
drivers/macintosh/windfarm_lm87_sensor.c
Normal file
201
drivers/macintosh/windfarm_lm87_sensor.c
Normal file
@ -0,0 +1,201 @@
|
||||
/*
|
||||
* Windfarm PowerMac thermal control. LM87 sensor
|
||||
*
|
||||
* Copyright 2012 Benjamin Herrenschmidt, IBM Corp.
|
||||
*
|
||||
* 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_lm87_sensor {
|
||||
struct i2c_client *i2c;
|
||||
struct wf_sensor sens;
|
||||
};
|
||||
#define wf_to_lm87(c) container_of(c, struct wf_lm87_sensor, sens)
|
||||
|
||||
|
||||
static int wf_lm87_read_reg(struct i2c_client *chip, int reg)
|
||||
{
|
||||
int rc, tries = 0;
|
||||
u8 buf;
|
||||
|
||||
for (;;) {
|
||||
/* Set address */
|
||||
buf = (u8)reg;
|
||||
rc = i2c_master_send(chip, &buf, 1);
|
||||
if (rc <= 0)
|
||||
goto error;
|
||||
rc = i2c_master_recv(chip, &buf, 1);
|
||||
if (rc <= 0)
|
||||
goto error;
|
||||
return (int)buf;
|
||||
error:
|
||||
DBG("wf_lm87: Error reading LM87, retrying...\n");
|
||||
if (++tries > 10) {
|
||||
printk(KERN_ERR "wf_lm87: Error reading LM87 !\n");
|
||||
return -EIO;
|
||||
}
|
||||
msleep(10);
|
||||
}
|
||||
}
|
||||
|
||||
static int wf_lm87_get(struct wf_sensor *sr, s32 *value)
|
||||
{
|
||||
struct wf_lm87_sensor *lm = sr->priv;
|
||||
s32 temp;
|
||||
|
||||
if (lm->i2c == NULL)
|
||||
return -ENODEV;
|
||||
|
||||
#define LM87_INT_TEMP 0x27
|
||||
|
||||
/* Read temperature register */
|
||||
temp = wf_lm87_read_reg(lm->i2c, LM87_INT_TEMP);
|
||||
if (temp < 0)
|
||||
return temp;
|
||||
*value = temp << 16;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void wf_lm87_release(struct wf_sensor *sr)
|
||||
{
|
||||
struct wf_lm87_sensor *lm = wf_to_lm87(sr);
|
||||
|
||||
kfree(lm);
|
||||
}
|
||||
|
||||
static struct wf_sensor_ops wf_lm87_ops = {
|
||||
.get_value = wf_lm87_get,
|
||||
.release = wf_lm87_release,
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
static int wf_lm87_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct wf_lm87_sensor *lm;
|
||||
const char *name = NULL, *loc;
|
||||
struct device_node *np = NULL;
|
||||
int rc;
|
||||
|
||||
/*
|
||||
* The lm87 contains a whole pile of sensors, additionally,
|
||||
* the Xserve G5 has several lm87's. However, for now we only
|
||||
* care about the internal temperature sensor
|
||||
*/
|
||||
while ((np = of_get_next_child(client->dev.of_node, np)) != NULL) {
|
||||
if (strcmp(np->name, "int-temp"))
|
||||
continue;
|
||||
loc = of_get_property(np, "location", NULL);
|
||||
if (!loc)
|
||||
continue;
|
||||
if (strstr(loc, "DIMM"))
|
||||
name = "dimms-temp";
|
||||
else if (strstr(loc, "Processors"))
|
||||
name = "between-cpus-temp";
|
||||
if (name) {
|
||||
of_node_put(np);
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (!name) {
|
||||
pr_warning("wf_lm87: Unsupported sensor %s\n",
|
||||
client->dev.of_node->full_name);
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
lm = kzalloc(sizeof(struct wf_lm87_sensor), GFP_KERNEL);
|
||||
if (lm == NULL)
|
||||
return -ENODEV;
|
||||
|
||||
lm->i2c = client;
|
||||
lm->sens.name = name;
|
||||
lm->sens.ops = &wf_lm87_ops;
|
||||
lm->sens.priv = lm;
|
||||
i2c_set_clientdata(client, lm);
|
||||
|
||||
rc = wf_register_sensor(&lm->sens);
|
||||
if (rc)
|
||||
kfree(lm);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int wf_lm87_remove(struct i2c_client *client)
|
||||
{
|
||||
struct wf_lm87_sensor *lm = i2c_get_clientdata(client);
|
||||
|
||||
DBG("wf_lm87: 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_lm87_id[] = {
|
||||
{ "MAC,lm87cimt", 0 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, wf_lm87_id);
|
||||
|
||||
static struct i2c_driver wf_lm87_driver = {
|
||||
.driver = {
|
||||
.name = "wf_lm87",
|
||||
},
|
||||
.probe = wf_lm87_probe,
|
||||
.remove = wf_lm87_remove,
|
||||
.id_table = wf_lm87_id,
|
||||
};
|
||||
|
||||
static int __init wf_lm87_sensor_init(void)
|
||||
{
|
||||
/* We only support this on the Xserve */
|
||||
if (!of_machine_is_compatible("RackMac3,1"))
|
||||
return -ENODEV;
|
||||
|
||||
return i2c_add_driver(&wf_lm87_driver);
|
||||
}
|
||||
|
||||
static void __exit wf_lm87_sensor_exit(void)
|
||||
{
|
||||
i2c_del_driver(&wf_lm87_driver);
|
||||
}
|
||||
|
||||
|
||||
module_init(wf_lm87_sensor_init);
|
||||
module_exit(wf_lm87_sensor_exit);
|
||||
|
||||
MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
|
||||
MODULE_DESCRIPTION("LM87 sensor objects for PowerMacs thermal control");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
Loading…
Reference in New Issue
Block a user