| /* |
| * 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 "1.0" |
| |
| #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, ds1775 = id->driver_data; |
| const char *name, *loc; |
| |
| 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 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[] = { |
| { "MAC,lm75", 0 }, |
| { "MAC,ds1775", 1 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, wf_lm75_id); |
| |
| static struct i2c_driver wf_lm75_driver = { |
| .driver = { |
| .name = "wf_lm75", |
| }, |
| .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"); |
| |