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193 lines
4.3 KiB
193 lines
4.3 KiB
// 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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* <[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/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/prom.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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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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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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const struct i2c_device_id *id) |
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{ |
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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 int 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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return 0; |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control"); |
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MODULE_LICENSE("GPL"); |
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