![Jean Delvare](/assets/img/avatar_default.png)
If i2c device probing fails, then there is no driver to dereference after calling i2c_new_device(). Stop assuming that probing will always succeed, to avoid NULL pointer dereferences. We have an easier access to the driver anyway. Signed-off-by: Jean Delvare <khali@linux-fr.org> Tested-by: Tim Shepard <shep@alum.mit.edu> Cc: Colin Leroy <colin@colino.net>
209 lines
4.8 KiB
C
209 lines
4.8 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 "0.2"
|
|
|
|
/* 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)
|
|
{
|
|
struct wf_6690_sensor *max;
|
|
int rc;
|
|
|
|
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 = client->dev.platform_data;
|
|
max->sens.ops = &wf_max6690_ops;
|
|
i2c_set_clientdata(client, max);
|
|
|
|
rc = wf_register_sensor(&max->sens);
|
|
if (rc) {
|
|
i2c_set_clientdata(client, NULL);
|
|
kfree(max);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static struct i2c_driver wf_max6690_driver;
|
|
|
|
static struct i2c_client *wf_max6690_create(struct i2c_adapter *adapter,
|
|
u8 addr, const char *loc)
|
|
{
|
|
struct i2c_board_info info;
|
|
struct i2c_client *client;
|
|
char *name;
|
|
|
|
if (!strcmp(loc, "BACKSIDE"))
|
|
name = "backside-temp";
|
|
else if (!strcmp(loc, "NB Ambient"))
|
|
name = "north-bridge-temp";
|
|
else if (!strcmp(loc, "GPU Ambient"))
|
|
name = "gpu-temp";
|
|
else
|
|
goto fail;
|
|
|
|
memset(&info, 0, sizeof(struct i2c_board_info));
|
|
info.addr = addr >> 1;
|
|
info.platform_data = name;
|
|
strlcpy(info.type, "wf_max6690", I2C_NAME_SIZE);
|
|
|
|
client = i2c_new_device(adapter, &info);
|
|
if (client == NULL) {
|
|
printk(KERN_ERR "windfarm: failed to attach MAX6690 sensor\n");
|
|
goto fail;
|
|
}
|
|
|
|
/*
|
|
* Let i2c-core delete that device on driver removal.
|
|
* This is safe because i2c-core holds the core_lock mutex for us.
|
|
*/
|
|
list_add_tail(&client->detected, &wf_max6690_driver.clients);
|
|
return client;
|
|
|
|
fail:
|
|
return NULL;
|
|
}
|
|
|
|
static int wf_max6690_attach(struct i2c_adapter *adapter)
|
|
{
|
|
struct device_node *busnode, *dev = NULL;
|
|
struct pmac_i2c_bus *bus;
|
|
const char *loc;
|
|
|
|
bus = pmac_i2c_adapter_to_bus(adapter);
|
|
if (bus == NULL)
|
|
return -ENODEV;
|
|
busnode = pmac_i2c_get_bus_node(bus);
|
|
|
|
while ((dev = of_get_next_child(busnode, dev)) != NULL) {
|
|
u8 addr;
|
|
|
|
/* We must re-match the adapter in order to properly check
|
|
* the channel on multibus setups
|
|
*/
|
|
if (!pmac_i2c_match_adapter(dev, adapter))
|
|
continue;
|
|
if (!of_device_is_compatible(dev, "max6690"))
|
|
continue;
|
|
addr = pmac_i2c_get_dev_addr(dev);
|
|
loc = of_get_property(dev, "hwsensor-location", NULL);
|
|
if (loc == NULL || addr == 0)
|
|
continue;
|
|
printk("found max6690, loc=%s addr=0x%02x\n", loc, addr);
|
|
wf_max6690_create(adapter, addr, loc);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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[] = {
|
|
{ "wf_max6690", 0 },
|
|
{ }
|
|
};
|
|
|
|
static struct i2c_driver wf_max6690_driver = {
|
|
.driver = {
|
|
.name = "wf_max6690",
|
|
},
|
|
.attach_adapter = wf_max6690_attach,
|
|
.probe = wf_max6690_probe,
|
|
.remove = wf_max6690_remove,
|
|
.id_table = wf_max6690_id,
|
|
};
|
|
|
|
static int __init wf_max6690_sensor_init(void)
|
|
{
|
|
/* Don't register on old machines that use therm_pm72 for now */
|
|
if (machine_is_compatible("PowerMac7,2") ||
|
|
machine_is_compatible("PowerMac7,3") ||
|
|
machine_is_compatible("RackMac3,1"))
|
|
return -ENODEV;
|
|
return i2c_add_driver(&wf_max6690_driver);
|
|
}
|
|
|
|
static void __exit wf_max6690_sensor_exit(void)
|
|
{
|
|
i2c_del_driver(&wf_max6690_driver);
|
|
}
|
|
|
|
module_init(wf_max6690_sensor_init);
|
|
module_exit(wf_max6690_sensor_exit);
|
|
|
|
MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
|
|
MODULE_DESCRIPTION("MAX6690 sensor objects for PowerMac thermal control");
|
|
MODULE_LICENSE("GPL");
|