diff options
Diffstat (limited to 'drivers/macintosh/windfarm_lm75_sensor.c')
| -rw-r--r-- | drivers/macintosh/windfarm_lm75_sensor.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/drivers/macintosh/windfarm_lm75_sensor.c b/drivers/macintosh/windfarm_lm75_sensor.c new file mode 100644 index 00000000..4d6a90a1 --- /dev/null +++ b/drivers/macintosh/windfarm_lm75_sensor.c @@ -0,0 +1,257 @@ +/* + * Windfarm PowerMac thermal control. LM75 sensor + * + * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp. + * <benh@kernel.crashing.org> + * + * Released under the term of the GNU GPL v2. + */ + +#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 <asm/prom.h> +#include <asm/machdep.h> +#include <asm/io.h> +#include <asm/sections.h> +#include <asm/pmac_low_i2c.h> + +#include "windfarm.h" + +#define VERSION "0.2" + +#undef DEBUG + +#ifdef DEBUG +#define DBG(args...) printk(args) +#else +#define DBG(args...) do { } while(0) +#endif + +struct wf_lm75_sensor { + int ds1775 : 1; + 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 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; + + lm = kzalloc(sizeof(struct wf_lm75_sensor), GFP_KERNEL); + if (lm == NULL) + return -ENODEV; + + lm->inited = 0; + lm->ds1775 = id->driver_data; + lm->i2c = client; + lm->sens.name = client->dev.platform_data; + lm->sens.ops = &wf_lm75_ops; + i2c_set_clientdata(client, lm); + + rc = wf_register_sensor(&lm->sens); + if (rc) + kfree(lm); + + return rc; +} + +static struct i2c_driver wf_lm75_driver; + +static struct i2c_client *wf_lm75_create(struct i2c_adapter *adapter, + u8 addr, int ds1775, + const char *loc) +{ + struct i2c_board_info info; + struct i2c_client *client; + char *name; + + DBG("wf_lm75: creating %s device at address 0x%02x\n", + ds1775 ? "ds1775" : "lm75", addr); + + /* 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 + goto fail; + + memset(&info, 0, sizeof(struct i2c_board_info)); + info.addr = (addr >> 1) & 0x7f; + info.platform_data = name; + strlcpy(info.type, ds1775 ? "wf_ds1775" : "wf_lm75", I2C_NAME_SIZE); + + client = i2c_new_device(adapter, &info); + if (client == NULL) { + printk(KERN_ERR "windfarm: failed to attach %s %s to i2c\n", + ds1775 ? "ds1775" : "lm75", name); + 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_lm75_driver.clients); + return client; + fail: + return NULL; +} + +static int wf_lm75_attach(struct i2c_adapter *adapter) +{ + struct device_node *busnode, *dev; + struct pmac_i2c_bus *bus; + + DBG("wf_lm75: adapter %s detected\n", adapter->name); + + bus = pmac_i2c_adapter_to_bus(adapter); + if (bus == NULL) + return -ENODEV; + busnode = pmac_i2c_get_bus_node(bus); + + DBG("wf_lm75: bus found, looking for device...\n"); + + /* Now look for lm75(s) in there */ + for (dev = NULL; + (dev = of_get_next_child(busnode, dev)) != NULL;) { + const char *loc = + of_get_property(dev, "hwsensor-location", 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; + addr = pmac_i2c_get_dev_addr(dev); + if (loc == NULL || addr == 0) + continue; + /* real lm75 */ + if (of_device_is_compatible(dev, "lm75")) + wf_lm75_create(adapter, addr, 0, loc); + /* ds1775 (compatible, better resolution */ + else if (of_device_is_compatible(dev, "ds1775")) + wf_lm75_create(adapter, addr, 1, loc); + } + return 0; +} + +static int wf_lm75_remove(struct i2c_client *client) +{ + struct wf_lm75_sensor *lm = i2c_get_clientdata(client); + + DBG("wf_lm75: i2c detatch called for %s\n", lm->sens.name); + + /* Mark client detached */ + lm->i2c = NULL; + + /* release sensor */ + wf_unregister_sensor(&lm->sens); + + return 0; +} + +static const struct i2c_device_id wf_lm75_id[] = { + { "wf_lm75", 0 }, + { "wf_ds1775", 1 }, + { } +}; + +static struct i2c_driver wf_lm75_driver = { + .driver = { + .name = "wf_lm75", + }, + .attach_adapter = wf_lm75_attach, + .probe = wf_lm75_probe, + .remove = wf_lm75_remove, + .id_table = wf_lm75_id, +}; + +static int __init wf_lm75_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_lm75_driver); +} + +static void __exit wf_lm75_sensor_exit(void) +{ + i2c_del_driver(&wf_lm75_driver); +} + + +module_init(wf_lm75_sensor_init); +module_exit(wf_lm75_sensor_exit); + +MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); +MODULE_DESCRIPTION("LM75 sensor objects for PowerMacs thermal control"); +MODULE_LICENSE("GPL"); + |