191 lines
4.3 KiB
C
191 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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 <linux/of_device.h>
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#include <asm/machdep.h>
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#include <asm/io.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 "1.0"
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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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unsigned int ds1775 : 1;
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unsigned 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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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 == 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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kfree(lm);
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}
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static const 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 int wf_lm75_probe(struct i2c_client *client)
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{
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const struct i2c_device_id *id = i2c_client_get_device_id(client);
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struct wf_lm75_sensor *lm;
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int rc, ds1775;
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const char *name, *loc;
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if (id)
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ds1775 = id->driver_data;
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else
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ds1775 = !!of_device_get_match_data(&client->dev);
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DBG("wf_lm75: creating %s device at address 0x%02x\n",
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ds1775 ? "ds1775" : "lm75", client->addr);
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loc = of_get_property(client->dev.of_node, "hwsensor-location", NULL);
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if (!loc) {
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dev_warn(&client->dev, "Missing hwsensor-location property!\n");
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return -ENXIO;
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}
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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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name = "hd-temp";
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else if (!strcmp(loc, "Incoming Air Temp"))
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name = "incoming-air-temp";
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else if (!strcmp(loc, "ODD Temp"))
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name = "optical-drive-temp";
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else if (!strcmp(loc, "HD Temp"))
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name = "hard-drive-temp";
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else if (!strcmp(loc, "PCI SLOTS"))
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name = "slots-temp";
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else if (!strcmp(loc, "CPU A INLET"))
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name = "cpu-inlet-temp-0";
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else if (!strcmp(loc, "CPU B INLET"))
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name = "cpu-inlet-temp-1";
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else
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return -ENXIO;
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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 -ENODEV;
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lm->inited = 0;
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lm->ds1775 = ds1775;
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lm->i2c = client;
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lm->sens.name = name;
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lm->sens.ops = &wf_lm75_ops;
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i2c_set_clientdata(client, lm);
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rc = wf_register_sensor(&lm->sens);
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if (rc)
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kfree(lm);
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return rc;
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}
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static void wf_lm75_remove(struct i2c_client *client)
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{
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struct wf_lm75_sensor *lm = i2c_get_clientdata(client);
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/* Mark client detached */
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lm->i2c = NULL;
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/* release sensor */
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wf_unregister_sensor(&lm->sens);
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}
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static const struct i2c_device_id wf_lm75_id[] = {
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{ "MAC,lm75", 0 },
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{ "MAC,ds1775", 1 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, wf_lm75_id);
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static const struct of_device_id wf_lm75_of_id[] = {
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{ .compatible = "lm75", .data = (void *)0},
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{ .compatible = "ds1775", .data = (void *)1 },
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{ }
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};
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MODULE_DEVICE_TABLE(of, wf_lm75_of_id);
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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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.of_match_table = wf_lm75_of_id,
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},
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.probe = wf_lm75_probe,
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.remove = wf_lm75_remove,
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.id_table = wf_lm75_id,
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};
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module_i2c_driver(wf_lm75_driver);
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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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