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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>
242 lines
5.6 KiB
C
242 lines
5.6 KiB
C
/*
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* Windfarm PowerMac thermal control. LM75 sensor
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*
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* (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
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* <benh@kernel.crashing.org>
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*
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* Released under the term 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/delay.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/wait.h>
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#include <linux/i2c.h>
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#include <asm/prom.h>
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#include <asm/machdep.h>
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#include <asm/io.h>
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#include <asm/system.h>
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#include <asm/sections.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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#undef DEBUG
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#ifdef DEBUG
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#define DBG(args...) printk(args)
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#else
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#define DBG(args...) do { } while(0)
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#endif
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struct wf_lm75_sensor {
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int ds1775 : 1;
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int inited : 1;
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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_lm75(c) container_of(c, struct wf_lm75_sensor, sens)
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#define i2c_to_lm75(c) container_of(c, struct wf_lm75_sensor, i2c)
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static int wf_lm75_attach(struct i2c_adapter *adapter);
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static int wf_lm75_detach(struct i2c_client *client);
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static struct i2c_driver wf_lm75_driver = {
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.driver = {
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.name = "wf_lm75",
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},
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.attach_adapter = wf_lm75_attach,
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.detach_client = wf_lm75_detach,
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};
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static int wf_lm75_get(struct wf_sensor *sr, s32 *value)
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{
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struct wf_lm75_sensor *lm = wf_to_lm75(sr);
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s32 data;
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if (lm->i2c.adapter == NULL)
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return -ENODEV;
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/* Init chip if necessary */
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if (!lm->inited) {
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u8 cfg_new, cfg = (u8)i2c_smbus_read_byte_data(&lm->i2c, 1);
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DBG("wf_lm75: Initializing %s, cfg was: %02x\n",
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sr->name, cfg);
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/* clear shutdown bit, keep other settings as left by
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* the firmware for now
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*/
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cfg_new = cfg & ~0x01;
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i2c_smbus_write_byte_data(&lm->i2c, 1, cfg_new);
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lm->inited = 1;
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/* If we just powered it up, let's wait 200 ms */
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msleep(200);
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}
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/* Read temperature register */
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data = (s32)le16_to_cpu(i2c_smbus_read_word_data(&lm->i2c, 0));
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data <<= 8;
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*value = data;
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return 0;
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}
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static void wf_lm75_release(struct wf_sensor *sr)
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{
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struct wf_lm75_sensor *lm = wf_to_lm75(sr);
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/* check if client is registered and detach from i2c */
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if (lm->i2c.adapter) {
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i2c_detach_client(&lm->i2c);
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lm->i2c.adapter = NULL;
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}
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kfree(lm);
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}
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static struct wf_sensor_ops wf_lm75_ops = {
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.get_value = wf_lm75_get,
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.release = wf_lm75_release,
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.owner = THIS_MODULE,
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};
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static struct wf_lm75_sensor *wf_lm75_create(struct i2c_adapter *adapter,
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u8 addr, int ds1775,
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const char *loc)
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{
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struct wf_lm75_sensor *lm;
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int rc;
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DBG("wf_lm75: creating %s device at address 0x%02x\n",
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ds1775 ? "ds1775" : "lm75", addr);
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lm = kzalloc(sizeof(struct wf_lm75_sensor), GFP_KERNEL);
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if (lm == NULL)
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return NULL;
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/* Usual rant about sensor names not beeing very consistent in
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* the device-tree, oh well ...
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* Add more entries below as you deal with more setups
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*/
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if (!strcmp(loc, "Hard drive") || !strcmp(loc, "DRIVE BAY"))
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lm->sens.name = "hd-temp";
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else if (!strcmp(loc, "Incoming Air Temp"))
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lm->sens.name = "incoming-air-temp";
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else if (!strcmp(loc, "ODD Temp"))
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lm->sens.name = "optical-drive-temp";
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else if (!strcmp(loc, "HD Temp"))
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lm->sens.name = "hard-drive-temp";
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else
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goto fail;
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lm->inited = 0;
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lm->sens.ops = &wf_lm75_ops;
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lm->ds1775 = ds1775;
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lm->i2c.addr = (addr >> 1) & 0x7f;
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lm->i2c.adapter = adapter;
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lm->i2c.driver = &wf_lm75_driver;
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strncpy(lm->i2c.name, lm->sens.name, I2C_NAME_SIZE-1);
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rc = i2c_attach_client(&lm->i2c);
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if (rc) {
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printk(KERN_ERR "windfarm: failed to attach %s %s to i2c,"
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" err %d\n", ds1775 ? "ds1775" : "lm75",
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lm->i2c.name, rc);
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goto fail;
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}
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if (wf_register_sensor(&lm->sens)) {
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i2c_detach_client(&lm->i2c);
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goto fail;
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}
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return lm;
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fail:
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kfree(lm);
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return NULL;
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}
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static int wf_lm75_attach(struct i2c_adapter *adapter)
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{
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struct device_node *busnode, *dev;
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struct pmac_i2c_bus *bus;
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DBG("wf_lm75: adapter %s detected\n", adapter->name);
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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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DBG("wf_lm75: bus found, looking for device...\n");
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/* Now look for lm75(s) in there */
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for (dev = NULL;
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(dev = of_get_next_child(busnode, dev)) != NULL;) {
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const char *loc =
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of_get_property(dev, "hwsensor-location", 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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addr = pmac_i2c_get_dev_addr(dev);
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if (loc == NULL || addr == 0)
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continue;
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/* real lm75 */
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if (of_device_is_compatible(dev, "lm75"))
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wf_lm75_create(adapter, addr, 0, loc);
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/* ds1775 (compatible, better resolution */
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else if (of_device_is_compatible(dev, "ds1775"))
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wf_lm75_create(adapter, addr, 1, loc);
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}
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return 0;
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}
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static int wf_lm75_detach(struct i2c_client *client)
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{
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struct wf_lm75_sensor *lm = i2c_to_lm75(client);
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DBG("wf_lm75: i2c detatch called for %s\n", lm->sens.name);
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/* Mark client detached */
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lm->i2c.adapter = NULL;
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/* release sensor */
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wf_unregister_sensor(&lm->sens);
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return 0;
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}
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static int __init wf_lm75_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_lm75_driver);
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}
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static void __exit wf_lm75_sensor_exit(void)
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{
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i2c_del_driver(&wf_lm75_driver);
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}
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module_init(wf_lm75_sensor_init);
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module_exit(wf_lm75_sensor_exit);
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MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
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MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control");
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MODULE_LICENSE("GPL");
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