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path: root/drivers/macintosh/windfarm_lm75_sensor.c
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Diffstat (limited to 'drivers/macintosh/windfarm_lm75_sensor.c')
-rw-r--r--drivers/macintosh/windfarm_lm75_sensor.c190
1 files changed, 190 insertions, 0 deletions
diff --git a/drivers/macintosh/windfarm_lm75_sensor.c b/drivers/macintosh/windfarm_lm75_sensor.c
new file mode 100644
index 000000000..9dd80837a
--- /dev/null
+++ b/drivers/macintosh/windfarm_lm75_sensor.c
@@ -0,0 +1,190 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Windfarm PowerMac thermal control. LM75 sensor
+ *
+ * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
+ * <benh@kernel.crashing.org>
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/wait.h>
+#include <linux/i2c.h>
+#include <linux/of_device.h>
+#include <asm/machdep.h>
+#include <asm/io.h>
+#include <asm/sections.h>
+#include <asm/pmac_low_i2c.h>
+
+#include "windfarm.h"
+
+#define VERSION "1.0"
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define DBG(args...) printk(args)
+#else
+#define DBG(args...) do { } while(0)
+#endif
+
+struct wf_lm75_sensor {
+ unsigned int ds1775 : 1;
+ unsigned int inited : 1;
+ struct i2c_client *i2c;
+ struct wf_sensor sens;
+};
+#define wf_to_lm75(c) container_of(c, struct wf_lm75_sensor, sens)
+
+static int wf_lm75_get(struct wf_sensor *sr, s32 *value)
+{
+ struct wf_lm75_sensor *lm = wf_to_lm75(sr);
+ s32 data;
+
+ if (lm->i2c == NULL)
+ return -ENODEV;
+
+ /* Init chip if necessary */
+ if (!lm->inited) {
+ u8 cfg_new, cfg = (u8)i2c_smbus_read_byte_data(lm->i2c, 1);
+
+ DBG("wf_lm75: Initializing %s, cfg was: %02x\n",
+ sr->name, cfg);
+
+ /* clear shutdown bit, keep other settings as left by
+ * the firmware for now
+ */
+ cfg_new = cfg & ~0x01;
+ i2c_smbus_write_byte_data(lm->i2c, 1, cfg_new);
+ lm->inited = 1;
+
+ /* If we just powered it up, let's wait 200 ms */
+ msleep(200);
+ }
+
+ /* Read temperature register */
+ data = (s32)le16_to_cpu(i2c_smbus_read_word_data(lm->i2c, 0));
+ data <<= 8;
+ *value = data;
+
+ return 0;
+}
+
+static void wf_lm75_release(struct wf_sensor *sr)
+{
+ struct wf_lm75_sensor *lm = wf_to_lm75(sr);
+
+ kfree(lm);
+}
+
+static const struct wf_sensor_ops wf_lm75_ops = {
+ .get_value = wf_lm75_get,
+ .release = wf_lm75_release,
+ .owner = THIS_MODULE,
+};
+
+static int wf_lm75_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct wf_lm75_sensor *lm;
+ int rc, ds1775;
+ const char *name, *loc;
+
+ if (id)
+ ds1775 = id->driver_data;
+ else
+ ds1775 = !!of_device_get_match_data(&client->dev);
+
+ DBG("wf_lm75: creating %s device at address 0x%02x\n",
+ ds1775 ? "ds1775" : "lm75", client->addr);
+
+ loc = of_get_property(client->dev.of_node, "hwsensor-location", NULL);
+ if (!loc) {
+ dev_warn(&client->dev, "Missing hwsensor-location property!\n");
+ return -ENXIO;
+ }
+
+ /* Usual rant about sensor names not beeing very consistent in
+ * the device-tree, oh well ...
+ * Add more entries below as you deal with more setups
+ */
+ if (!strcmp(loc, "Hard drive") || !strcmp(loc, "DRIVE BAY"))
+ name = "hd-temp";
+ else if (!strcmp(loc, "Incoming Air Temp"))
+ name = "incoming-air-temp";
+ else if (!strcmp(loc, "ODD Temp"))
+ name = "optical-drive-temp";
+ else if (!strcmp(loc, "HD Temp"))
+ name = "hard-drive-temp";
+ else if (!strcmp(loc, "PCI SLOTS"))
+ name = "slots-temp";
+ else if (!strcmp(loc, "CPU A INLET"))
+ name = "cpu-inlet-temp-0";
+ else if (!strcmp(loc, "CPU B INLET"))
+ name = "cpu-inlet-temp-1";
+ else
+ return -ENXIO;
+
+
+ lm = kzalloc(sizeof(struct wf_lm75_sensor), GFP_KERNEL);
+ if (lm == NULL)
+ return -ENODEV;
+
+ lm->inited = 0;
+ lm->ds1775 = ds1775;
+ lm->i2c = client;
+ lm->sens.name = name;
+ lm->sens.ops = &wf_lm75_ops;
+ i2c_set_clientdata(client, lm);
+
+ rc = wf_register_sensor(&lm->sens);
+ if (rc)
+ kfree(lm);
+ return rc;
+}
+
+static void wf_lm75_remove(struct i2c_client *client)
+{
+ struct wf_lm75_sensor *lm = i2c_get_clientdata(client);
+
+ /* Mark client detached */
+ lm->i2c = NULL;
+
+ /* release sensor */
+ wf_unregister_sensor(&lm->sens);
+}
+
+static const struct i2c_device_id wf_lm75_id[] = {
+ { "MAC,lm75", 0 },
+ { "MAC,ds1775", 1 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, wf_lm75_id);
+
+static const struct of_device_id wf_lm75_of_id[] = {
+ { .compatible = "lm75", .data = (void *)0},
+ { .compatible = "ds1775", .data = (void *)1 },
+ { }
+};
+MODULE_DEVICE_TABLE(of, wf_lm75_of_id);
+
+static struct i2c_driver wf_lm75_driver = {
+ .driver = {
+ .name = "wf_lm75",
+ .of_match_table = wf_lm75_of_id,
+ },
+ .probe = wf_lm75_probe,
+ .remove = wf_lm75_remove,
+ .id_table = wf_lm75_id,
+};
+
+module_i2c_driver(wf_lm75_driver);
+
+MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
+MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control");
+MODULE_LICENSE("GPL");
+