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// SPDX-License-Identifier: GPL-2.0-only
/*
* Windfarm PowerMac thermal control. LM87 sensor
*
* Copyright 2012 Benjamin Herrenschmidt, IBM Corp.
*/
#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/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 const 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
*/
for_each_child_of_node(client->dev.of_node, np) {
if (!of_node_name_eq(np, "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_warn("wf_lm87: Unsupported sensor %pOF\n",
client->dev.of_node);
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);
/* 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 const struct of_device_id wf_lm87_of_id[] = {
{ .compatible = "lm87cimt", },
{ }
};
MODULE_DEVICE_TABLE(of, wf_lm87_of_id);
static struct i2c_driver wf_lm87_driver = {
.driver = {
.name = "wf_lm87",
.of_match_table = wf_lm87_of_id,
},
.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");
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