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A new chip driver for the LM83.
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1839 7894878c-1315-0410-8ee3-d5d059ff63e0
This commit is contained in:
Jean Delvare committed
1 parent
6061076893
commit
230509767a
1 file changed
+510
@@ -0,0 +1,510 @@
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/*
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* lm83.c - Part of lm_sensors, Linux kernel modules for hardware
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* monitoring
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* Copyright (c) 2003 Jean Delvare <khali@linux-fr.org>
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*
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* Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is
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* a sensor chip made by National Semiconducor. It reports up to four
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* temperatures (its own plus up to three external ones) with a 1 deg
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* resolution and a 3-4 deg precision. Complete datasheet can be obtained
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* from National's website at:
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* http://www.national.com/pf/LM/LM83.html
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/i2c-proc.h>
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#include "version.h"
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/*
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* Addresses to scan
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* Address is selected using 2 three-level pins, resulting in 9 possible
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* addresses.
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*/
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static unsigned short normal_i2c[] = { SENSORS_I2C_END };
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static unsigned short normal_i2c_range[] = { 0x18, 0x1a, 0x29, 0x2b,
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0x4c, 0x4e, SENSORS_I2C_END };
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static unsigned int normal_isa[] = { SENSORS_ISA_END };
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static unsigned int normal_isa_range[] = { SENSORS_ISA_END };
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/*
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* Insmod parameters
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*/
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SENSORS_INSMOD_1(lm83);
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/*
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* The LM83 registers
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* Manufacturer ID is 0x01 for National Semiconductor.
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*/
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#define LM83_REG_R_MAN_ID 0xFE
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#define LM83_REG_R_CONFIG 0x03
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#define LM83_REG_W_CONFIG 0x09
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#define LM83_REG_R_STATUS1 0x02
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#define LM83_REG_R_STATUS2 0x35
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#define LM83_REG_R_LOCAL_TEMP 0x00
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#define LM83_REG_R_LOCAL_HIGH 0x05
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#define LM83_REG_W_LOCAL_HIGH 0x0B
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#define LM83_REG_R_REMOTE1_TEMP 0x30
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#define LM83_REG_R_REMOTE1_HIGH 0x38
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#define LM83_REG_W_REMOTE1_HIGH 0x50
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#define LM83_REG_R_REMOTE2_TEMP 0x01
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#define LM83_REG_R_REMOTE2_HIGH 0x07
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#define LM83_REG_W_REMOTE2_HIGH 0x0D
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#define LM83_REG_R_REMOTE3_TEMP 0x31
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#define LM83_REG_R_REMOTE3_HIGH 0x3A
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#define LM83_REG_W_REMOTE3_HIGH 0x52
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/*
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* Conversions and initial values
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* The LM83 uses normal signed 8-bit values. We use the default initial
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* values.
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*/
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#define TEMP_FROM_REG(val) (val > 127 ? val-256 : val)
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#define TEMP_TO_REG(val) (val < 0 ? val+256 : val)
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#define LM83_INIT_HIGH 127
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/*
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* Functions declaration
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*/
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static int lm83_attach_adapter(struct i2c_adapter *adapter);
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static int lm83_detect(struct i2c_adapter *adapter, int address, unsigned
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short flags, int kind);
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static void lm83_init_client(struct i2c_client *client);
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static int lm83_detach_client(struct i2c_client *client);
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static int lm83_read_value(struct i2c_client *client, u8 reg);
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static int lm83_write_value(struct i2c_client *client, u8 reg, u8 value);
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static void lm83_local_temp(struct i2c_client *client, int operation, int
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ctl_name, int *nrels_mag, long *results);
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static void lm83_remote1_temp(struct i2c_client *client, int operation, int
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ctl_name, int *nrels_mag, long *results);
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static void lm83_remote2_temp(struct i2c_client *client, int operation, int
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ctl_name, int *nrels_mag, long *results);
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static void lm83_remote3_temp(struct i2c_client *client, int operation, int
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ctl_name, int *nrels_mag, long *results);
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/*
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* Driver data (common to all clients)
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*/
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static struct i2c_driver lm83_driver = {
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.owner = THIS_MODULE,
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.name = "LM83 sensor driver",
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.id = I2C_DRIVERID_LM83,
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.flags = I2C_DF_NOTIFY,
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.attach_adapter = lm83_attach_adapter,
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.detach_client = lm83_detach_client
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};
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/*
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* Client data (each client gets its own)
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*/
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struct lm83_data
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{
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int sysctl_id;
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struct semaphore update_lock;
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char valid; /* zero until following fields are valid */
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unsigned long last_updated; /* in jiffies */
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/* registers values */
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u8 local_temp, local_high;
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u8 remote1_temp, remote1_high;
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u8 remote2_temp, remote2_high;
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u8 remote3_temp, remote3_high;
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};
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/*
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* Proc entries
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* These files are created for each detected LM83.
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*/
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/* -- SENSORS SYSCTL START -- */
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#define LM83_SYSCTL_LOCAL_TEMP 1200
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#define LM83_SYSCTL_REMOTE1_TEMP 1201
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#define LM83_SYSCTL_REMOTE2_TEMP 1202
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#define LM83_SYSCTL_REMOTE3_TEMP 1203
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/* -- SENSORS SYSCTL END -- */
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static ctl_table lm83_dir_table_template[] =
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{
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{LM83_SYSCTL_LOCAL_TEMP, "temp1", NULL, 0, 0644, NULL,
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&i2c_proc_real, &i2c_sysctl_real, NULL, &lm83_local_temp},
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{LM83_SYSCTL_REMOTE1_TEMP, "temp2", NULL, 0, 0644, NULL,
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&i2c_proc_real, &i2c_sysctl_real, NULL, &lm83_remote1_temp},
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{LM83_SYSCTL_REMOTE2_TEMP, "temp3", NULL, 0, 0644, NULL,
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&i2c_proc_real, &i2c_sysctl_real, NULL, &lm83_remote2_temp},
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{LM83_SYSCTL_REMOTE3_TEMP, "temp4", NULL, 0, 0644, NULL,
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&i2c_proc_real, &i2c_sysctl_real, NULL, &lm83_remote3_temp},
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{0}
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};
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/*
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* Internal variables
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*/
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static int lm83_id = 0;
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/*
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* Real code
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*/
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static int lm83_attach_adapter(struct i2c_adapter *adapter)
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{
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return i2c_detect(adapter, &addr_data, lm83_detect);
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}
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/*
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* The following function does more than just detection. If detection
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* succeeds, it also registers the new chip.
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*/
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static int lm83_detect(struct i2c_adapter *adapter, int address, unsigned
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short flags, int kind)
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{
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struct i2c_client *new_client;
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struct lm83_data *data;
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int err = 0;
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const char *type_name = "";
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const char *client_name = "";
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#ifdef DEBUG
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if (i2c_is_isa_adapter(adapter))
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{
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printk("lm83.o: Called for an ISA bus adapter, aborting.\n");
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return 0;
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}
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#endif
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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{
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#ifdef DEBUG
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printk("lm83.o: I2C bus doesn't support byte read mode, "
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"skipping.\n");
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#endif
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return 0;
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}
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if (!(new_client = kmalloc(sizeof(struct i2c_client) + sizeof(struct
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lm83_data), GFP_KERNEL)))
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{
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printk("lm83.o: Out of memory in lm83_detect (new_client).\n");
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return -ENOMEM;
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}
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/*
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* The LM83-specific data is placed right after the common I2C
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* client data, and is pointed to by the data field from the I2C
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* client data.
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*/
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new_client->addr = address;
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new_client->data = data = (struct lm83_data *) (new_client + 1);
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new_client->adapter = adapter;
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new_client->driver = &lm83_driver;
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new_client->flags = 0;
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/*
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* Now we do the remaining detection. A negative kind means that
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* the driver was loaded with no force parameter (default), so we
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* must both detect and identify the chip (actually there is only
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* one possible kind of chip for now, LM83). A zero kind means that
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* the driver was loaded with the force parameter, the detection
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* step shall be skipped. A positive kind means that the driver
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* was loaded with the force parameter and a given kind of chip is
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* requested, so both the detection and the identification steps
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* are skipped.
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*/
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if (kind < 0) /* detection */
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{
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if (((lm83_read_value(new_client, LM83_REG_R_STATUS1)
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& 0xA8) != 0x00)
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|| ((lm83_read_value(new_client, LM83_REG_R_STATUS2)
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& 0x48) != 0x00)
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|| ((lm83_read_value(new_client, LM83_REG_R_CONFIG)
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& 0x41) != 0x00))
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{
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#ifdef DEBUG
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printk("lm83.o: LM83 detection failed at 0x%02x.\n",
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address);
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#endif
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goto ERROR1;
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}
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}
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if (kind <= 0) /* identification */
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{
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unsigned char man_id;
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man_id = lm83_read_value(new_client, LM83_REG_R_MAN_ID);
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if (man_id == 0x01) /* National Semiconductor */
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kind = lm83;
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}
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if (kind <= 0) /* identification failed */
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{
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printk("lm83.o: Unsupported chip.\n");
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goto ERROR1;
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}
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if (kind == lm83)
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{
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type_name = "lm83";
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client_name = "LM83 chip";
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} else
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{
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printk("lm83.o: Unknown kind %d.\n", kind);
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goto ERROR1;
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}
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/*
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* OK, we got a valid chip so we can fill in the remaining client
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* fields.
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*/
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strcpy(new_client->name, client_name);
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new_client->id = lm83_id++;
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data->valid = 0;
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init_MUTEX(&data->update_lock);
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/*
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* Tell the I2C layer a new client has arrived.
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*/
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if ((err = i2c_attach_client(new_client)))
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{
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#ifdef DEBUG
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printk("lm83.o: Failed attaching client.\n");
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#endif
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goto ERROR1;
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}
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/*
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* Register a new directory entry.
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*/
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if ((err = i2c_register_entry(new_client, type_name,
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lm83_dir_table_template)) < 0)
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{
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#ifdef DEBUG
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printk("lm83.o: Failed registering directory entry.\n");
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#endif
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goto ERROR2;
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}
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data->sysctl_id = err;
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/*
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* Initialize the LM83 chip
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*/
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lm83_init_client(new_client);
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return 0;
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ERROR2:
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i2c_detach_client(new_client);
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ERROR1:
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kfree(new_client);
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return err;
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}
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static void lm83_init_client(struct i2c_client *client)
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{
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lm83_write_value(client, LM83_REG_W_LOCAL_HIGH,
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TEMP_TO_REG(LM83_INIT_HIGH));
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lm83_write_value(client, LM83_REG_W_REMOTE1_HIGH,
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TEMP_TO_REG(LM83_INIT_HIGH));
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lm83_write_value(client, LM83_REG_W_REMOTE2_HIGH,
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TEMP_TO_REG(LM83_INIT_HIGH));
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lm83_write_value(client, LM83_REG_W_REMOTE3_HIGH,
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TEMP_TO_REG(LM83_INIT_HIGH));
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}
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static int lm83_detach_client(struct i2c_client *client)
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{
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int err;
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i2c_deregister_entry(((struct lm83_data *) (client->data))->sysctl_id);
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if ((err = i2c_detach_client(client)))
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{
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printk("lm83.o: Client deregistration failed, client not "
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"detached.\n");
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return err;
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}
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kfree(client);
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return 0;
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}
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static int lm83_read_value(struct i2c_client *client, u8 reg)
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{
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return i2c_smbus_read_byte_data(client, reg);
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}
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static int lm83_write_value(struct i2c_client *client, u8 reg, u8 value)
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{
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return i2c_smbus_write_byte_data(client, reg, value);
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}
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static void lm83_update_client(struct i2c_client *client)
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{
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struct lm83_data *data = client->data;
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down(&data->update_lock);
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if ((jiffies - data->last_updated > HZ + HZ / 2) ||
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(jiffies < data->last_updated) || !data->valid)
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{
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#ifdef DEBUG
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printk("lm83.o: Updating LM83 data.\n");
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#endif
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data->local_temp =
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lm83_read_value(client, LM83_REG_R_LOCAL_TEMP);
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data->remote1_temp =
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lm83_read_value(client, LM83_REG_R_REMOTE1_TEMP);
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data->remote2_temp =
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lm83_read_value(client, LM83_REG_R_REMOTE2_TEMP);
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data->remote3_temp =
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lm83_read_value(client, LM83_REG_R_REMOTE3_TEMP);
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data->last_updated = jiffies;
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data->valid = 1;
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}
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up(&data->update_lock);
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}
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static void lm83_local_temp(struct i2c_client *client, int operation, int
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ctl_name, int *nrels_mag, long *results)
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{
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struct lm83_data *data = client->data;
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if (operation == SENSORS_PROC_REAL_INFO)
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*nrels_mag = 0;
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else if (operation == SENSORS_PROC_REAL_READ)
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{
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lm83_update_client(client);
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results[0] = TEMP_FROM_REG(data->local_temp);
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results[1] = TEMP_FROM_REG(data->local_high);
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*nrels_mag = 2;
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}
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else if (operation == SENSORS_PROC_REAL_WRITE)
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{
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if (*nrels_mag >= 1)
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{
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data->local_high = TEMP_TO_REG(results[0]);
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lm83_write_value(client, LM83_REG_W_LOCAL_HIGH,
|
||||
data->local_high);
|
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}
|
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}
|
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}
|
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|
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static void lm83_remote1_temp(struct i2c_client *client, int operation, int
|
||||
ctl_name, int *nrels_mag, long *results)
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||||
{
|
||||
struct lm83_data *data = client->data;
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if (operation == SENSORS_PROC_REAL_INFO)
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*nrels_mag = 0;
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else if (operation == SENSORS_PROC_REAL_READ)
|
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{
|
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lm83_update_client(client);
|
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results[0] = TEMP_FROM_REG(data->remote1_temp);
|
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results[1] = TEMP_FROM_REG(data->remote1_high);
|
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*nrels_mag = 2;
|
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}
|
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else if (operation == SENSORS_PROC_REAL_WRITE)
|
||||
{
|
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if (*nrels_mag >= 1)
|
||||
{
|
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data->remote1_high = TEMP_TO_REG(results[0]);
|
||||
lm83_write_value(client, LM83_REG_W_REMOTE1_HIGH,
|
||||
data->remote1_high);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void lm83_remote2_temp(struct i2c_client *client, int operation, int
|
||||
ctl_name, int *nrels_mag, long *results)
|
||||
{
|
||||
struct lm83_data *data = client->data;
|
||||
if (operation == SENSORS_PROC_REAL_INFO)
|
||||
*nrels_mag = 0;
|
||||
else if (operation == SENSORS_PROC_REAL_READ)
|
||||
{
|
||||
lm83_update_client(client);
|
||||
results[0] = TEMP_FROM_REG(data->remote2_temp);
|
||||
results[1] = TEMP_FROM_REG(data->remote2_high);
|
||||
*nrels_mag = 2;
|
||||
}
|
||||
else if (operation == SENSORS_PROC_REAL_WRITE)
|
||||
{
|
||||
if (*nrels_mag >= 1)
|
||||
{
|
||||
data->remote2_high = TEMP_TO_REG(results[0]);
|
||||
lm83_write_value(client, LM83_REG_W_REMOTE2_HIGH,
|
||||
data->remote2_high);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void lm83_remote3_temp(struct i2c_client *client, int operation, int
|
||||
ctl_name, int *nrels_mag, long *results)
|
||||
{
|
||||
struct lm83_data *data = client->data;
|
||||
if (operation == SENSORS_PROC_REAL_INFO)
|
||||
*nrels_mag = 0;
|
||||
else if (operation == SENSORS_PROC_REAL_READ)
|
||||
{
|
||||
lm83_update_client(client);
|
||||
results[0] = TEMP_FROM_REG(data->remote3_temp);
|
||||
results[1] = TEMP_FROM_REG(data->remote3_high);
|
||||
*nrels_mag = 2;
|
||||
}
|
||||
else if (operation == SENSORS_PROC_REAL_WRITE)
|
||||
{
|
||||
if (*nrels_mag >= 1)
|
||||
{
|
||||
data->remote3_high = TEMP_TO_REG(results[0]);
|
||||
lm83_write_value(client, LM83_REG_W_REMOTE3_HIGH,
|
||||
data->remote3_high);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static int __init sm_lm83_init(void)
|
||||
{
|
||||
printk(KERN_INFO "lm83.o version %s (%s)\n", LM_VERSION, LM_DATE);
|
||||
return i2c_add_driver(&lm83_driver);
|
||||
}
|
||||
|
||||
static void __exit sm_lm83_exit(void)
|
||||
{
|
||||
i2c_del_driver(&lm83_driver);
|
||||
}
|
||||
|
||||
MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
|
||||
MODULE_DESCRIPTION("LM83 sensor driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
module_init(sm_lm83_init);
|
||||
module_exit(sm_lm83_exit);
|
||||
Reference in new issue
Block a user