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143 lines
3.2 KiB
143 lines
3.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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. <[email protected]> |
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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 "1.0" |
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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 const 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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const char *name, *loc; |
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struct wf_6690_sensor *max; |
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int rc; |
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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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/* |
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* We only expose the external temperature register for |
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* now as this is all we need for our control loops |
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*/ |
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if (!strcmp(loc, "BACKSIDE") || !strcmp(loc, "SYS CTRLR AMBIENT")) |
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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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return -ENXIO; |
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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 = name; |
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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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kfree(max); |
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return rc; |
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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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{ "MAC,max6690", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, wf_max6690_id); |
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static const struct of_device_id wf_max6690_of_id[] = { |
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{ .compatible = "max6690", }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, wf_max6690_of_id); |
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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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.of_match_table = wf_max6690_of_id, |
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}, |
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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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module_i2c_driver(wf_max6690_driver); |
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MODULE_AUTHOR("Paul Mackerras <[email protected]>"); |
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MODULE_DESCRIPTION("MAX6690 sensor objects for PowerMac thermal control"); |
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MODULE_LICENSE("GPL");
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