From 99f49b2123476b4429b9028d72803194146db8ae Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Sun, 14 Dec 2003 17:17:00 +0000 Subject: [PATCH] New driver for the Winbond W83L785TS-S. git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@2174 7894878c-1315-0410-8ee3-d5d059ff63e0 --- kernel/chips/Module.mk | 1 + kernel/chips/w83l785ts.c | 349 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 350 insertions(+) create mode 100644 kernel/chips/w83l785ts.c diff --git a/kernel/chips/Module.mk b/kernel/chips/Module.mk index 7a38df2c..ff11d0f1 100644 --- a/kernel/chips/Module.mk +++ b/kernel/chips/Module.mk @@ -37,6 +37,7 @@ KERNELCHIPSTARGETS += $(MODULE_DIR)/smartbatt.o KERNELCHIPSTARGETS += $(MODULE_DIR)/smbus-arp.o KERNELCHIPSTARGETS += $(MODULE_DIR)/vt8231.o KERNELCHIPSTARGETS += $(MODULE_DIR)/w83627hf.o +KERNELCHIPSTARGETS += $(MODULE_DIR)/w83l785ts.o KERNELCHIPSTARGETS += $(MODULE_DIR)/xeontemp.o diff --git a/kernel/chips/w83l785ts.c b/kernel/chips/w83l785ts.c new file mode 100644 index 00000000..60024ba4 --- /dev/null +++ b/kernel/chips/w83l785ts.c @@ -0,0 +1,349 @@ +/* + * w83l785ts.c - Part of lm_sensors, Linux kernel modules for hardware + * monitoring + * Copyright (C) 2003 Jean Delvare + * + * Inspired from the lm83 driver. The W83L785TS-S is a sensor chip made + * by Winbond. It reports a single external temperature with a 1 deg + * resolution and a 3 deg accuracy. Datasheet can be obtained from + * Winbond's website at: + * http://www.winbond-usa.com/products/winbond_products/pdfs/PCIC/W86L785TS-S.pdf + * Yes, the file name is wrong. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include +#include +#include +#include +#include +#include "version.h" + +/* + * Address to scan + */ + +static unsigned short normal_i2c[] = { 0x2e, SENSORS_I2C_END }; +static unsigned short normal_i2c_range[] = { SENSORS_I2C_END }; +static unsigned int normal_isa[] = { SENSORS_ISA_END }; +static unsigned int normal_isa_range[] = { SENSORS_ISA_END }; + +/* + * Insmod parameters + */ + +SENSORS_INSMOD_1(w83l785ts); + +/* + * The W83L785TS-S registers + * Manufacturer ID is 0x5CA3 for Winbond. + */ + +#define W83L785TS_REG_MAN_ID1 0x4D +#define W83L785TS_REG_MAN_ID2 0x4C +#define W83L785TS_REG_CHIP_ID 0x4E +#define W83L785TS_REG_CONFIG 0x40 +#define W83L785TS_REG_TYPE 0x52 +#define W83L785TS_REG_TEMP 0x27 +#define W83L785TS_REG_HIGH 0x05 + +/* + * Conversions, initial values and various macros + * The W83L785TS-S uses signed 8-bit values. + */ + +#define TEMP_FROM_REG(val) (val > 127 ? val-256 : val) + +/* + * Functions declaration + */ + +static int w83l785ts_attach_adapter(struct i2c_adapter *adapter); +static int w83l785ts_detect(struct i2c_adapter *adapter, int address, unsigned + short flags, int kind); +static int w83l785ts_detach_client(struct i2c_client *client); +static void w83l785ts_update_client(struct i2c_client *client); +static void w83l785ts_temp(struct i2c_client *client, int operation, int + ctl_name, int *nrels_mag, long *results); + +/* + * Driver data (common to all clients) + */ + +static struct i2c_driver w83l785ts_driver = { + .owner = THIS_MODULE, + .name = "W83L785S-S sensor driver", + .id = I2C_DRIVERID_W83L785TS, + .flags = I2C_DF_NOTIFY, + .attach_adapter = w83l785ts_attach_adapter, + .detach_client = w83l785ts_detach_client, +}; + +/* + * Client data (each client gets its own) + */ + +struct w83l785ts_data { + int sysctl_id; + + struct semaphore update_lock; + char valid; /* zero until following fields are valid */ + unsigned long last_updated; /* in jiffies */ + + /* registers values */ + u8 temp, temp_high; +}; + +/* + * Proc entries + * These files are created for each detected W83L785TS-S. + */ + +/* -- SENSORS SYSCTL START -- */ + +#define W83L785TS_SYSCTL_TEMP 1200 + +/* -- SENSORS SYSCTL END -- */ + + +static ctl_table w83l785ts_dir_table_template[] = +{ + {W83L785TS_SYSCTL_TEMP, "temp", NULL, 0, 0444, NULL, + &i2c_proc_real, &i2c_sysctl_real, NULL, &w83l785ts_temp}, + {0} +}; + +/* + * Internal variables + */ + +static int w83l785ts_id = 0; + +/* + * Real code + */ + +static int w83l785ts_attach_adapter(struct i2c_adapter *adapter) +{ + return i2c_detect(adapter, &addr_data, w83l785ts_detect); +} + +/* + * The following function does more than just detection. If detection + * succeeds, it also registers the new chip. + */ +static int w83l785ts_detect(struct i2c_adapter *adapter, int address, + unsigned short flags, int kind) +{ + struct i2c_client *new_client; + struct w83l785ts_data *data; + int err = 0; + const char *type_name = ""; + const char *client_name = ""; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { +#ifdef DEBUG + printk(KERN_DEBUG "w83l785ts.o: I2C bus doesn't support " + "byte read mode, skipping.\n"); +#endif + return 0; + } + + if (!(new_client = kmalloc(sizeof(struct i2c_client) + sizeof(struct w83l785ts_data), + GFP_KERNEL))) { + printk(KERN_ERR "w83l785ts.o: Out of memory in w83l785ts_detect " + "(new_client).\n"); + return -ENOMEM; + } + + /* + * The W83L785TS-specific data is placed right after the common I2C + * client data, and is pointed to by the data field from the I2C + * client data. + */ + + new_client->addr = address; + new_client->data = data = (struct w83l785ts_data *) (new_client + 1); + new_client->adapter = adapter; + new_client->driver = &w83l785ts_driver; + new_client->flags = 0; + + /* + * Now we do the remaining detection. A negative kind means that + * the driver was loaded with no force parameter (default), so we + * must both detect and identify the chip (actually there is only + * one possible kind of chip for now, W83L785TS-S). A zero kind means + * that the driver was loaded with the force parameter, the detection + * step shall be skipped. A positive kind means that the driver + * was loaded with the force parameter and a given kind of chip is + * requested, so both the detection and the identification steps + * are skipped. + */ + + if (kind < 0) { /* detection */ + if (((i2c_smbus_read_byte_data(new_client, W83L785TS_REG_CONFIG) & 0x80) != 0x00) + || ((i2c_smbus_read_byte_data(new_client, W83L785TS_REG_TYPE) & 0xFC) != 0x00)) { +#ifdef DEBUG + printk(KERN_DEBUG "w83l785ts.o: Detection failed at " + "0x%02x.\n", address); +#endif + goto ERROR1; + } + } + + if (kind <= 0) { /* identification */ + u16 man_id; + u8 chip_id; + + man_id = (i2c_smbus_read_byte_data(new_client, W83L785TS_REG_MAN_ID1) << 8) + + i2c_smbus_read_byte_data(new_client, W83L785TS_REG_MAN_ID2); + chip_id = i2c_smbus_read_byte_data(new_client, W83L785TS_REG_CHIP_ID); + if (man_id == 0x5CA3) { /* Winbond */ + if (chip_id == 0x70) + kind = w83l785ts; + } + } + + if (kind <= 0) { /* identification failed */ + printk(KERN_INFO "w83l785ts.o: Unsupported chip.\n"); + goto ERROR1; + } + + if (kind == w83l785ts) { + type_name = "w83l785ts"; + client_name = "W83L785TS-S chip"; + } else { + printk(KERN_ERR "w83l785ts.o: Unknown kind %d.\n", kind); + goto ERROR1; + } + + /* + * OK, we got a valid chip so we can fill in the remaining client + * fields. + */ + + strcpy(new_client->name, client_name); + new_client->id = w83l785ts_id++; + data->valid = 0; + init_MUTEX(&data->update_lock); + + /* + * Tell the I2C layer a new client has arrived. + */ + + if ((err = i2c_attach_client(new_client))) { +#ifdef DEBUG + printk(KERN_ERR "w83l785ts.o: Failed attaching client.\n"); +#endif + goto ERROR1; + } + + /* + * Register a new directory entry. + */ + + if ((err = i2c_register_entry(new_client, type_name, + w83l785ts_dir_table_template)) < 0) { +#ifdef DEBUG + printk(KERN_ERR "w83l785ts.o: Failed registering directory " + "entry.\n"); +#endif + goto ERROR2; + } + data->sysctl_id = err; + + /* + * Initialize the W83L785TS chip + * Nothing yet, assume it is already started. + */ + + return 0; + + ERROR2: + i2c_detach_client(new_client); + ERROR1: + kfree(new_client); + return err; +} + +static int w83l785ts_detach_client(struct i2c_client *client) +{ + int err; + + i2c_deregister_entry(((struct w83l785ts_data *) (client->data))->sysctl_id); + if ((err = i2c_detach_client(client))) { + printk(KERN_ERR "w83l785ts.o: Client deregistration failed, " + "client not detached.\n"); + return err; + } + + kfree(client); + return 0; +} + +static void w83l785ts_update_client(struct i2c_client *client) +{ + struct w83l785ts_data *data = client->data; + + down(&data->update_lock); + + if ((jiffies - data->last_updated > HZ * 2) + || (jiffies < data->last_updated) + || !data->valid) { +#ifdef DEBUG + printk(KERN_DEBUG "w83l785ts.o: Updating data.\n"); +#endif + data->temp = i2c_smbus_read_byte_data(client, W83L785TS_REG_TEMP); + data->temp_high = i2c_smbus_read_byte_data(client, W83L785TS_REG_HIGH); + data->last_updated = jiffies; + data->valid = 1; + } + + up(&data->update_lock); +} + +static void w83l785ts_temp(struct i2c_client *client, int operation, + int ctl_name, int *nrels_mag, long *results) +{ + struct w83l785ts_data *data = client->data; + + if (operation == SENSORS_PROC_REAL_INFO) { + *nrels_mag = 0; /* magnitude */ + } else if (operation == SENSORS_PROC_REAL_READ) { + w83l785ts_update_client(client); + results[0] = TEMP_FROM_REG(data->temp_high); + results[1] = TEMP_FROM_REG(data->temp); + *nrels_mag = 2; + } +} + +static int __init sm_w83l785ts_init(void) +{ + printk(KERN_INFO "w83l785ts.o version %s (%s)\n", LM_VERSION, LM_DATE); + return i2c_add_driver(&w83l785ts_driver); +} + +static void __exit sm_w83l785ts_exit(void) +{ + i2c_del_driver(&w83l785ts_driver); +} + +MODULE_AUTHOR("Jean Delvare "); +MODULE_DESCRIPTION("W83L785TS-S sensor driver"); +MODULE_LICENSE("GPL"); + +module_init(sm_w83l785ts_init); +module_exit(sm_w83l785ts_exit);