Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / macintosh / windfarm_max6690_sensor.c

diff --git a/kernel/drivers/macintosh/windfarm_max6690_sensor.c b/kernel/drivers/macintosh/windfarm_max6690_sensor.c
new file mode 100644 (file)
index 0000000..87e439b
--- /dev/null
+++ b/kernel/drivers/macintosh/windfarm_max6690_sensor.c
@@ -0,0 +1,137 @@
+/*
+ * Windfarm PowerMac thermal control.  MAX6690 sensor.
+ *
+ * Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org>
+ *
+ * Use and redistribute under the terms of the GNU GPL v2.
+ */
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <asm/prom.h>
+#include <asm/pmac_low_i2c.h>
+
+#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 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 struct i2c_device_id *id)
+{
+       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 int wf_max6690_remove(struct i2c_client *client)
+{
+       struct wf_6690_sensor *max = i2c_get_clientdata(client);
+
+       max->i2c = NULL;
+       wf_unregister_sensor(&max->sens);
+
+       return 0;
+}
+
+static const struct i2c_device_id wf_max6690_id[] = {
+       { "MAC,max6690", 0 },
+       { }
+};
+MODULE_DEVICE_TABLE(i2c, wf_max6690_id);
+
+static struct i2c_driver wf_max6690_driver = {
+       .driver = {
+               .name           = "wf_max6690",
+       },
+       .probe          = wf_max6690_probe,
+       .remove         = wf_max6690_remove,
+       .id_table       = wf_max6690_id,
+};
+
+module_i2c_driver(wf_max6690_driver);
+
+MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
+MODULE_DESCRIPTION("MAX6690 sensor objects for PowerMac thermal control");
+MODULE_LICENSE("GPL");