mirror of https://gitee.com/openkylin/linux.git
209 lines
4.8 KiB
C
209 lines
4.8 KiB
C
/*
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* Windfarm PowerMac thermal control. MAX6690 sensor.
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*
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* Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org>
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*
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* Use and redistribute under the terms of the GNU GPL v2.
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <asm/prom.h>
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#include <asm/pmac_low_i2c.h>
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#include "windfarm.h"
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#define VERSION "0.2"
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/* This currently only exports the external temperature sensor,
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since that's all the control loops need. */
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/* Some MAX6690 register numbers */
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#define MAX6690_INTERNAL_TEMP 0
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#define MAX6690_EXTERNAL_TEMP 1
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struct wf_6690_sensor {
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struct i2c_client *i2c;
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struct wf_sensor sens;
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};
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#define wf_to_6690(x) container_of((x), struct wf_6690_sensor, sens)
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static int wf_max6690_get(struct wf_sensor *sr, s32 *value)
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{
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struct wf_6690_sensor *max = wf_to_6690(sr);
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s32 data;
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if (max->i2c == NULL)
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return -ENODEV;
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/* chip gets initialized by firmware */
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data = i2c_smbus_read_byte_data(max->i2c, MAX6690_EXTERNAL_TEMP);
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if (data < 0)
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return data;
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*value = data << 16;
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return 0;
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}
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static void wf_max6690_release(struct wf_sensor *sr)
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{
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struct wf_6690_sensor *max = wf_to_6690(sr);
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kfree(max);
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}
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static struct wf_sensor_ops wf_max6690_ops = {
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.get_value = wf_max6690_get,
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.release = wf_max6690_release,
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.owner = THIS_MODULE,
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};
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static int wf_max6690_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct wf_6690_sensor *max;
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int rc;
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max = kzalloc(sizeof(struct wf_6690_sensor), GFP_KERNEL);
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if (max == NULL) {
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printk(KERN_ERR "windfarm: Couldn't create MAX6690 sensor: "
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"no memory\n");
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return -ENOMEM;
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}
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max->i2c = client;
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max->sens.name = client->dev.platform_data;
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max->sens.ops = &wf_max6690_ops;
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i2c_set_clientdata(client, max);
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rc = wf_register_sensor(&max->sens);
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if (rc) {
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i2c_set_clientdata(client, NULL);
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kfree(max);
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}
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return rc;
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}
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static struct i2c_driver wf_max6690_driver;
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static struct i2c_client *wf_max6690_create(struct i2c_adapter *adapter,
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u8 addr, const char *loc)
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{
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struct i2c_board_info info;
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struct i2c_client *client;
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char *name;
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if (!strcmp(loc, "BACKSIDE"))
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name = "backside-temp";
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else if (!strcmp(loc, "NB Ambient"))
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name = "north-bridge-temp";
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else if (!strcmp(loc, "GPU Ambient"))
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name = "gpu-temp";
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else
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goto fail;
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memset(&info, 0, sizeof(struct i2c_board_info));
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info.addr = addr >> 1;
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info.platform_data = name;
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strlcpy(info.type, "wf_max6690", I2C_NAME_SIZE);
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client = i2c_new_device(adapter, &info);
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if (client == NULL) {
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printk(KERN_ERR "windfarm: failed to attach MAX6690 sensor\n");
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goto fail;
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}
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/*
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* Let i2c-core delete that device on driver removal.
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* This is safe because i2c-core holds the core_lock mutex for us.
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*/
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list_add_tail(&client->detected, &wf_max6690_driver.clients);
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return client;
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fail:
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return NULL;
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}
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static int wf_max6690_attach(struct i2c_adapter *adapter)
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{
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struct device_node *busnode, *dev = NULL;
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struct pmac_i2c_bus *bus;
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const char *loc;
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bus = pmac_i2c_adapter_to_bus(adapter);
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if (bus == NULL)
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return -ENODEV;
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busnode = pmac_i2c_get_bus_node(bus);
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while ((dev = of_get_next_child(busnode, dev)) != NULL) {
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u8 addr;
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/* We must re-match the adapter in order to properly check
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* the channel on multibus setups
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*/
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if (!pmac_i2c_match_adapter(dev, adapter))
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continue;
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if (!of_device_is_compatible(dev, "max6690"))
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continue;
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addr = pmac_i2c_get_dev_addr(dev);
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loc = of_get_property(dev, "hwsensor-location", NULL);
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if (loc == NULL || addr == 0)
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continue;
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printk("found max6690, loc=%s addr=0x%02x\n", loc, addr);
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wf_max6690_create(adapter, addr, loc);
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}
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return 0;
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}
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static int wf_max6690_remove(struct i2c_client *client)
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{
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struct wf_6690_sensor *max = i2c_get_clientdata(client);
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max->i2c = NULL;
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wf_unregister_sensor(&max->sens);
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return 0;
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}
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static const struct i2c_device_id wf_max6690_id[] = {
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{ "wf_max6690", 0 },
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{ }
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};
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static struct i2c_driver wf_max6690_driver = {
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.driver = {
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.name = "wf_max6690",
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},
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.attach_adapter = wf_max6690_attach,
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.probe = wf_max6690_probe,
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.remove = wf_max6690_remove,
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.id_table = wf_max6690_id,
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};
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static int __init wf_max6690_sensor_init(void)
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{
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/* Don't register on old machines that use therm_pm72 for now */
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if (machine_is_compatible("PowerMac7,2") ||
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machine_is_compatible("PowerMac7,3") ||
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machine_is_compatible("RackMac3,1"))
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return -ENODEV;
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return i2c_add_driver(&wf_max6690_driver);
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}
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static void __exit wf_max6690_sensor_exit(void)
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{
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i2c_del_driver(&wf_max6690_driver);
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}
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module_init(wf_max6690_sensor_init);
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module_exit(wf_max6690_sensor_exit);
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MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
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MODULE_DESCRIPTION("MAX6690 sensor objects for PowerMac thermal control");
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MODULE_LICENSE("GPL");
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