linux/drivers/macintosh/windfarm_lm87_sensor.c
Colin Ian King 7db0a07273 macintosh: windfarm: remove detatch debug containing spelling mistakes
There are spelling mistakes in two debug messages. As recommended
by Wolfram Sang, these can be removed as there is plenty of debug
in the driver core.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200806102901.44988-1-colin.king@canonical.com
2020-09-02 11:00:17 +10:00

205 lines
4.1 KiB
C

// 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/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 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");