From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/macintosh/windfarm_max6690_sensor.c | 140 ++++++++++++++++++++++++++++ 1 file changed, 140 insertions(+) create mode 100644 drivers/macintosh/windfarm_max6690_sensor.c (limited to 'drivers/macintosh/windfarm_max6690_sensor.c') diff --git a/drivers/macintosh/windfarm_max6690_sensor.c b/drivers/macintosh/windfarm_max6690_sensor.c new file mode 100644 index 0000000000..02856d1f03 --- /dev/null +++ b/drivers/macintosh/windfarm_max6690_sensor.c @@ -0,0 +1,140 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Windfarm PowerMac thermal control. MAX6690 sensor. + * + * Copyright (C) 2005 Paul Mackerras, IBM Corp. + */ +#include +#include +#include +#include +#include +#include + +#include + +#include "windfarm.h" + +#define VERSION "1.0" + +/* This currently only exports the external temperature sensor, + since that's all the control loops need. */ + +/* Some MAX6690 register numbers */ +#define MAX6690_INTERNAL_TEMP 0 +#define MAX6690_EXTERNAL_TEMP 1 + +struct wf_6690_sensor { + struct i2c_client *i2c; + struct wf_sensor sens; +}; + +#define wf_to_6690(x) container_of((x), struct wf_6690_sensor, sens) + +static int wf_max6690_get(struct wf_sensor *sr, s32 *value) +{ + struct wf_6690_sensor *max = wf_to_6690(sr); + s32 data; + + if (max->i2c == NULL) + return -ENODEV; + + /* chip gets initialized by firmware */ + data = i2c_smbus_read_byte_data(max->i2c, MAX6690_EXTERNAL_TEMP); + if (data < 0) + return data; + *value = data << 16; + return 0; +} + +static void wf_max6690_release(struct wf_sensor *sr) +{ + struct wf_6690_sensor *max = wf_to_6690(sr); + + kfree(max); +} + +static const struct wf_sensor_ops wf_max6690_ops = { + .get_value = wf_max6690_get, + .release = wf_max6690_release, + .owner = THIS_MODULE, +}; + +static int wf_max6690_probe(struct i2c_client *client) +{ + const char *name, *loc; + struct wf_6690_sensor *max; + int rc; + + loc = of_get_property(client->dev.of_node, "hwsensor-location", NULL); + if (!loc) { + dev_warn(&client->dev, "Missing hwsensor-location property!\n"); + return -ENXIO; + } + + /* + * We only expose the external temperature register for + * now as this is all we need for our control loops + */ + if (!strcmp(loc, "BACKSIDE") || !strcmp(loc, "SYS CTRLR AMBIENT")) + name = "backside-temp"; + else if (!strcmp(loc, "NB Ambient")) + name = "north-bridge-temp"; + else if (!strcmp(loc, "GPU Ambient")) + name = "gpu-temp"; + else + return -ENXIO; + + max = kzalloc(sizeof(struct wf_6690_sensor), GFP_KERNEL); + if (max == NULL) { + printk(KERN_ERR "windfarm: Couldn't create MAX6690 sensor: " + "no memory\n"); + return -ENOMEM; + } + + max->i2c = client; + max->sens.name = name; + max->sens.ops = &wf_max6690_ops; + i2c_set_clientdata(client, max); + + rc = wf_register_sensor(&max->sens); + if (rc) + kfree(max); + return rc; +} + +static void wf_max6690_remove(struct i2c_client *client) +{ + struct wf_6690_sensor *max = i2c_get_clientdata(client); + + max->i2c = NULL; + wf_unregister_sensor(&max->sens); +} + +static const struct i2c_device_id wf_max6690_id[] = { + { "MAC,max6690", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, wf_max6690_id); + +static const struct of_device_id wf_max6690_of_id[] = { + { .compatible = "max6690", }, + { } +}; +MODULE_DEVICE_TABLE(of, wf_max6690_of_id); + +static struct i2c_driver wf_max6690_driver = { + .driver = { + .name = "wf_max6690", + .of_match_table = wf_max6690_of_id, + }, + .probe = wf_max6690_probe, + .remove = wf_max6690_remove, + .id_table = wf_max6690_id, +}; + +module_i2c_driver(wf_max6690_driver); + +MODULE_AUTHOR("Paul Mackerras "); +MODULE_DESCRIPTION("MAX6690 sensor objects for PowerMac thermal control"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3