diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/macintosh/windfarm_max6690_sensor.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/macintosh/windfarm_max6690_sensor.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/ANDROID_3.4.5/drivers/macintosh/windfarm_max6690_sensor.c b/ANDROID_3.4.5/drivers/macintosh/windfarm_max6690_sensor.c new file mode 100644 index 00000000..82041132 --- /dev/null +++ b/ANDROID_3.4.5/drivers/macintosh/windfarm_max6690_sensor.c @@ -0,0 +1,207 @@ +/* + * 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 "0.2" + +/* 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) +{ + struct wf_6690_sensor *max; + int rc; + + 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 = client->dev.platform_data; + max->sens.ops = &wf_max6690_ops; + i2c_set_clientdata(client, max); + + rc = wf_register_sensor(&max->sens); + if (rc) { + kfree(max); + } + + return rc; +} + +static struct i2c_driver wf_max6690_driver; + +static struct i2c_client *wf_max6690_create(struct i2c_adapter *adapter, + u8 addr, const char *loc) +{ + struct i2c_board_info info; + struct i2c_client *client; + char *name; + + if (!strcmp(loc, "BACKSIDE")) + name = "backside-temp"; + else if (!strcmp(loc, "NB Ambient")) + name = "north-bridge-temp"; + else if (!strcmp(loc, "GPU Ambient")) + name = "gpu-temp"; + else + goto fail; + + memset(&info, 0, sizeof(struct i2c_board_info)); + info.addr = addr >> 1; + info.platform_data = name; + strlcpy(info.type, "wf_max6690", I2C_NAME_SIZE); + + client = i2c_new_device(adapter, &info); + if (client == NULL) { + printk(KERN_ERR "windfarm: failed to attach MAX6690 sensor\n"); + goto fail; + } + + /* + * Let i2c-core delete that device on driver removal. + * This is safe because i2c-core holds the core_lock mutex for us. + */ + list_add_tail(&client->detected, &wf_max6690_driver.clients); + return client; + + fail: + return NULL; +} + +static int wf_max6690_attach(struct i2c_adapter *adapter) +{ + struct device_node *busnode, *dev = NULL; + struct pmac_i2c_bus *bus; + const char *loc; + + bus = pmac_i2c_adapter_to_bus(adapter); + if (bus == NULL) + return -ENODEV; + busnode = pmac_i2c_get_bus_node(bus); + + while ((dev = of_get_next_child(busnode, dev)) != NULL) { + u8 addr; + + /* We must re-match the adapter in order to properly check + * the channel on multibus setups + */ + if (!pmac_i2c_match_adapter(dev, adapter)) + continue; + if (!of_device_is_compatible(dev, "max6690")) + continue; + addr = pmac_i2c_get_dev_addr(dev); + loc = of_get_property(dev, "hwsensor-location", NULL); + if (loc == NULL || addr == 0) + continue; + printk("found max6690, loc=%s addr=0x%02x\n", loc, addr); + wf_max6690_create(adapter, addr, loc); + } + + return 0; +} + +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[] = { + { "wf_max6690", 0 }, + { } +}; + +static struct i2c_driver wf_max6690_driver = { + .driver = { + .name = "wf_max6690", + }, + .attach_adapter = wf_max6690_attach, + .probe = wf_max6690_probe, + .remove = wf_max6690_remove, + .id_table = wf_max6690_id, +}; + +static int __init wf_max6690_sensor_init(void) +{ + /* Don't register on old machines that use therm_pm72 for now */ + if (of_machine_is_compatible("PowerMac7,2") || + of_machine_is_compatible("PowerMac7,3") || + of_machine_is_compatible("RackMac3,1")) + return -ENODEV; + return i2c_add_driver(&wf_max6690_driver); +} + +static void __exit wf_max6690_sensor_exit(void) +{ + i2c_del_driver(&wf_max6690_driver); +} + +module_init(wf_max6690_sensor_init); +module_exit(wf_max6690_sensor_exit); + +MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>"); +MODULE_DESCRIPTION("MAX6690 sensor objects for PowerMac thermal control"); +MODULE_LICENSE("GPL"); |