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![Étienne Bersac](/assets/img/avatar_default.png)
This implements a new driver named windfarm_pm121, which drives the fans on PowerMac 12,1 machines : iMac G5 iSight (rev C) 17" and 20". It's based on the windfarm_pm81 driver from Benjamin Herrenschmidt. This includes fixes from David Woodhouse correcting the names of some of the sensors. Signed-off-by: Étienne Bersac <bersace@gmail.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
187 lines
4.3 KiB
C
187 lines
4.3 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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#define i2c_to_6690(x) container_of((x), struct wf_6690_sensor, i2c)
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static int wf_max6690_attach(struct i2c_adapter *adapter);
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static int wf_max6690_detach(struct i2c_client *client);
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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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.detach_client = wf_max6690_detach,
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};
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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.adapter == 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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if (max->i2c.adapter) {
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i2c_detach_client(&max->i2c);
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max->i2c.adapter = NULL;
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}
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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 void wf_max6690_create(struct i2c_adapter *adapter, u8 addr,
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const char *loc)
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{
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struct wf_6690_sensor *max;
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char *name;
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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 %s: "
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"no memory\n", loc);
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return;
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}
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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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max->sens.ops = &wf_max6690_ops;
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max->sens.name = name;
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max->i2c.addr = addr >> 1;
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max->i2c.adapter = adapter;
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max->i2c.driver = &wf_max6690_driver;
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strncpy(max->i2c.name, name, I2C_NAME_SIZE-1);
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if (i2c_attach_client(&max->i2c)) {
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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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if (wf_register_sensor(&max->sens)) {
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i2c_detach_client(&max->i2c);
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goto fail;
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}
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return;
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fail:
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kfree(max);
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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_detach(struct i2c_client *client)
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{
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struct wf_6690_sensor *max = i2c_to_6690(client);
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max->i2c.adapter = 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 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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