Hi Greg,
Here comes a new i2c chip driver for Linux 2.6: gl518sm, ported from our
CVS repository by Hong-Gunn Chew. I have reviewed Gunn's code and we
made a few cleanups and improvements over the original driver. See our
complete exchange on the sensors mailing-list for details.
Please enqueue for inclusion into Linux 2.6.3.
Thanks.
diff -ruN linux-2.6.2-rc3/drivers/i2c/chips/Kconfig linux-2.6.2-rc3-k1/drivers/i2c/chips/Kconfig
--- linux-2.6.2-rc3/drivers/i2c/chips/Kconfig Sat Jan 31 19:16:29 2004
+++ linux-2.6.2-rc3-k1/drivers/i2c/chips/Kconfig Sat Jan 31 22:53:02 2004
@@ -45,6 +45,17 @@
This driver can also be built as a module. If so, the module
will be called eeprom.
+config SENSORS_GL518SM
+ tristate "Genesys Logic GL518SM"
+ depends on I2C && EXPERIMENTAL
+ select I2C_SENSOR
+ help
+ If you say yes here you get support for Genesys Logic GL518SM
+ sensor chips.
+
+ This driver can also be built as a module. If so, the module
+ will be called gl518sm.
+
config SENSORS_IT87
tristate "ITE IT87xx and compatibles"
depends on I2C && EXPERIMENTAL
diff -ruN linux-2.6.2-rc3/drivers/i2c/chips/Makefile linux-2.6.2-rc3-k1/drivers/i2c/chips/Makefile
--- linux-2.6.2-rc3/drivers/i2c/chips/Makefile Sat Jan 31 19:16:29 2004
+++ linux-2.6.2-rc3-k1/drivers/i2c/chips/Makefile Sat Jan 31 22:53:02 2004
@@ -8,6 +8,7 @@
obj-$(CONFIG_SENSORS_ADM1021) += adm1021.o
obj-$(CONFIG_SENSORS_EEPROM) += eeprom.o
+obj-$(CONFIG_SENSORS_GL518SM) += gl518sm.o
obj-$(CONFIG_SENSORS_IT87) += it87.o
obj-$(CONFIG_SENSORS_LM75) += lm75.o
obj-$(CONFIG_SENSORS_LM78) += lm78.o
diff -ruN linux-2.6.2-rc3/drivers/i2c/chips/gl518sm.c linux-2.6.2-rc3-k1/drivers/i2c/chips/gl518sm.c
--- linux-2.6.2-rc3/drivers/i2c/chips/gl518sm.c Thu Jan 1 01:00:00 1970
+++ linux-2.6.2-rc3-k1/drivers/i2c/chips/gl518sm.c Mon Feb 2 19:36:56 2004
@@ -0,0 +1,612 @@
+/*
+ * gl518sm.c - Part of lm_sensors, Linux kernel modules for hardware
+ * monitoring
+ * Copyright (C) 1998, 1999 Frodo Looijaard <frodol at dds.nl> and
+ * Kyosti Malkki <kmalkki at cc.hut.fi>
+ * Copyright (C) 2004 Hong-Gunn Chew <hglinux at gunnet.org> and
+ * Jean Delvare <khali at linux-fr.org>
+ *
+ * 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.
+ *
+ * Ported to Linux 2.6 by Hong-Gunn Chew with the help of Jean Delvare
+ * and advice of Greg Kroah-Hartman.
+ *
+ * Notes about the port:
+ * Release 0x00 of the GL518SM chipset doesn't support reading of in0,
+ * in1 nor in2. The original driver had an ugly workaround to get them
+ * anyway (changing limits and watching alarms trigger and wear off).
+ * We did not keep that part of the original driver in the Linux 2.6
+ * version, since it was making the driver significantly more complex
+ * with no real benefit.
+ *
+ * History:
+ * 2004-01-28 Original port. (Hong-Gunn Chew)
+ * 2004-01-31 Code review and approval. (Jean Delvare)
+ */
+
+#include <linux/config.h>
+#ifdef CONFIG_I2C_DEBUG_CHIP
+#define DEBUG 1
+#endif
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/i2c-sensor.h>
+
+/* Addresses to scan */
+static unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
+static unsigned short normal_i2c_range[] = { I2C_CLIENT_END };
+static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
+static unsigned int normal_isa_range[] = { I2C_CLIENT_ISA_END };
+
+/* Insmod parameters */
+SENSORS_INSMOD_2(gl518sm_r00, gl518sm_r80);
+
+/* Many GL518 constants specified below */
+
+/* The GL518 registers */
+#define GL518_REG_CHIP_ID 0x00
+#define GL518_REG_REVISION 0x01
+#define GL518_REG_VENDOR_ID 0x02
+#define GL518_REG_CONF 0x03
+#define GL518_REG_TEMP_IN 0x04
+#define GL518_REG_TEMP_MAX 0x05
+#define GL518_REG_TEMP_HYST 0x06
+#define GL518_REG_FAN_COUNT 0x07
+#define GL518_REG_FAN_LIMIT 0x08
+#define GL518_REG_VIN1_LIMIT 0x09
+#define GL518_REG_VIN2_LIMIT 0x0a
+#define GL518_REG_VIN3_LIMIT 0x0b
+#define GL518_REG_VDD_LIMIT 0x0c
+#define GL518_REG_VIN3 0x0d
+#define GL518_REG_MISC 0x0f
+#define GL518_REG_ALARM 0x10
+#define GL518_REG_MASK 0x11
+#define GL518_REG_INT 0x12
+#define GL518_REG_VIN2 0x13
+#define GL518_REG_VIN1 0x14
+#define GL518_REG_VDD 0x15
+
+
+/*
+ * Conversions. Rounding and limit checking is only done on the TO_REG
+ * variants. Note that you should be a bit careful with which arguments
+ * these macros are called: arguments may be evaluated more than once.
+ * Fixing this is just not worth it.
+ */
+
+#define RAW_FROM_REG(val) val
+
+#define BOOL_FROM_REG(val) ((val)?0:1)
+#define BOOL_TO_REG(val) ((val)?0:1)
+
+#define TEMP_TO_REG(val) (SENSORS_LIMIT(((((val)<0? \
+ (val)-500:(val)+500)/1000)+119),0,255))
+#define TEMP_FROM_REG(val) (((val) - 119) * 1000)
+
+static inline u8 FAN_TO_REG(long rpm, int div)
+{
+ long rpmdiv;
+ if (rpm == 0)
+ return 0;
+ rpmdiv = SENSORS_LIMIT(rpm, 1, 1920000) * div;
+ return SENSORS_LIMIT((960000 + rpmdiv / 2) / rpmdiv, 1, 255);
+}
+#define FAN_FROM_REG(val,div) ((val)==0 ? 0 : (960000/((val)*(div))))
+
+#define IN_TO_REG(val) (SENSORS_LIMIT((((val)+9)/19),0,255))
+#define IN_FROM_REG(val) ((val)*19)
+
+#define VDD_TO_REG(val) (SENSORS_LIMIT((((val)*4+47)/95),0,255))
+#define VDD_FROM_REG(val) (((val)*95+2)/4)
+
+#define DIV_TO_REG(val) ((val)==4?2:(val)==2?1:(val)==1?0:3)
+#define DIV_FROM_REG(val) (1 << (val))
+
+#define BEEP_MASK_TO_REG(val) ((val) & 0x7f & data->alarm_mask)
+#define BEEP_MASK_FROM_REG(val) ((val) & 0x7f)
+
+/* Each client has this additional data */
+struct gl518_data {
+ enum chips type;
+
+ struct semaphore update_lock;
+ char valid; /* !=0 if following fields are valid */
+ unsigned long last_updated; /* In jiffies */
+
+ u8 voltage_in[4]; /* Register values; [0] = VDD */
+ u8 voltage_min[4]; /* Register values; [0] = VDD */
+ u8 voltage_max[4]; /* Register values; [0] = VDD */
+ u8 iter_voltage_in[4]; /* Register values; [0] = VDD */
+ u8 fan_in[2];
+ u8 fan_min[2];
+ u8 fan_div[2]; /* Register encoding, shifted right */
+ u8 fan_auto1; /* Boolean */
+ u8 temp_in; /* Register values */
+ u8 temp_max; /* Register values */
+ u8 temp_hyst; /* Register values */
+ u8 alarms; /* Register value */
+ u8 alarm_mask; /* Register value */
+ u8 beep_mask; /* Register value */
+ u8 beep_enable; /* Boolean */
+};
+
+static int gl518_attach_adapter(struct i2c_adapter *adapter);
+static int gl518_detect(struct i2c_adapter *adapter, int address, int kind);
+static void gl518_init_client(struct i2c_client *client);
+static int gl518_detach_client(struct i2c_client *client);
+static int gl518_read_value(struct i2c_client *client, u8 reg);
+static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value);
+static void gl518_update_client(struct i2c_client *client);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver gl518_driver = {
+ .owner = THIS_MODULE,
+ .name = "gl518sm",
+ .id = I2C_DRIVERID_GL518,
+ .flags = I2C_DF_NOTIFY,
+ .attach_adapter = gl518_attach_adapter,
+ .detach_client = gl518_detach_client,
+};
+
+/*
+ * Internal variables
+ */
+
+static int gl518_id = 0;
+
+/*
+ * Sysfs stuff
+ */
+
+#define show(type, suffix, value) \
+static ssize_t show_##suffix(struct device *dev, char *buf) \
+{ \
+ struct i2c_client *client = to_i2c_client(dev); \
+ struct gl518_data *data = i2c_get_clientdata(client); \
+ gl518_update_client(client); \
+ return sprintf(buf, "%d\n", type##_FROM_REG(data->value)); \
+}
+
+#define show_fan(suffix, value, index) \
+static ssize_t show_##suffix(struct device *dev, char *buf) \
+{ \
+ struct i2c_client *client = to_i2c_client(dev); \
+ struct gl518_data *data = i2c_get_clientdata(client); \
+ gl518_update_client(client); \
+ return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[index], \
+ DIV_FROM_REG(data->fan_div[index]))); \
+}
+
+show(TEMP, temp_input1, temp_in);
+show(TEMP, temp_max1, temp_max);
+show(TEMP, temp_hyst1, temp_hyst);
+show(BOOL, fan_auto1, fan_auto1);
+show_fan(fan_input1, fan_in, 0);
+show_fan(fan_input2, fan_in, 1);
+show_fan(fan_min1, fan_min, 0);
+show_fan(fan_min2, fan_min, 1);
+show(DIV, fan_div1, fan_div[0]);
+show(DIV, fan_div2, fan_div[1]);
+show(VDD, in_input0, voltage_in[0]);
+show(IN, in_input1, voltage_in[1]);
+show(IN, in_input2, voltage_in[2]);
+show(IN, in_input3, voltage_in[3]);
+show(VDD, in_min0, voltage_min[0]);
+show(IN, in_min1, voltage_min[1]);
+show(IN, in_min2, voltage_min[2]);
+show(IN, in_min3, voltage_min[3]);
+show(VDD, in_max0, voltage_max[0]);
+show(IN, in_max1, voltage_max[1]);
+show(IN, in_max2, voltage_max[2]);
+show(IN, in_max3, voltage_max[3]);
+show(RAW, alarms, alarms);
+show(BOOL, beep_enable, beep_enable);
+show(BEEP_MASK, beep_mask, beep_mask);
+
+#define set(type, suffix, value, reg) \
+static ssize_t set_##suffix(struct device *dev, const char *buf, \
+ size_t count) \
+{ \
+ struct i2c_client *client = to_i2c_client(dev); \
+ struct gl518_data *data = i2c_get_clientdata(client); \
+ data->value = type##_TO_REG(simple_strtol(buf, NULL, 10)); \
+ gl518_write_value(client, reg, data->value); \
+ return count; \
+}
+
+#define set_bits(type, suffix, value, reg, mask, shift) \
+static ssize_t set_##suffix(struct device *dev, const char *buf, \
+ size_t count) \
+{ \
+ struct i2c_client *client = to_i2c_client(dev); \
+ struct gl518_data *data = i2c_get_clientdata(client); \
+ int regvalue = gl518_read_value(client, reg); \
+ data->value = type##_TO_REG(simple_strtoul(buf, NULL, 10)); \
+ regvalue = (regvalue & ~mask) | (data->value << shift); \
+ gl518_write_value(client, reg, regvalue); \
+ return count; \
+}
+
+#define set_low(type, suffix, value, reg) \
+ set_bits(type, suffix, value, reg, 0x00ff, 0)
+#define set_high(type, suffix, value, reg) \
+ set_bits(type, suffix, value, reg, 0xff00, 8)
+
+set(TEMP, temp_max1, temp_max, GL518_REG_TEMP_MAX);
+set(TEMP, temp_hyst1, temp_hyst, GL518_REG_TEMP_HYST);
+set_bits(BOOL, fan_auto1, fan_auto1, GL518_REG_MISC, 0x08, 3);
+set_bits(DIV, fan_div1, fan_div[0], GL518_REG_MISC, 0xc0, 6);
+set_bits(DIV, fan_div2, fan_div[1], GL518_REG_MISC, 0x30, 4);
+set_low(VDD, in_min0, voltage_min[0], GL518_REG_VDD_LIMIT);
+set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
+set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
+set_low(IN, in_min3, voltage_min[3], GL518_REG_VIN3_LIMIT);
+set_high(VDD, in_max0, voltage_max[0], GL518_REG_VDD_LIMIT);
+set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);
+set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);
+set_high(IN, in_max3, voltage_max[3], GL518_REG_VIN3_LIMIT);
+set_bits(BOOL, beep_enable, beep_enable, GL518_REG_CONF, 0x04, 2);
+set(BEEP_MASK, beep_mask, beep_mask, GL518_REG_ALARM);
+
+static ssize_t set_fan_min1(struct device *dev, const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct gl518_data *data = i2c_get_clientdata(client);
+ int regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
+
+ data->fan_min[0] = FAN_TO_REG(simple_strtoul(buf, NULL, 10),
+ DIV_FROM_REG(data->fan_div[0]));
+ regvalue = (regvalue & 0x00ff) | (data->fan_min[0] << 8);
+ gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
+
+ data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
+ if (data->fan_min[0] == 0)
+ data->alarm_mask &= ~0x20;
+ else
+ data->alarm_mask |= 0x20;
+ data->beep_mask &= data->alarm_mask;
+ gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
+
+ return count;
+}
+
+static ssize_t set_fan_min2(struct device *dev, const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct gl518_data *data = i2c_get_clientdata(client);
+ int regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
+
+ data->fan_min[1] = FAN_TO_REG(simple_strtoul(buf, NULL, 10),
+ DIV_FROM_REG(data->fan_div[1]));
+ regvalue = (regvalue & 0xff00) | data->fan_min[1];
+ gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
+
+ data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
+ if (data->fan_min[1] == 0)
+ data->alarm_mask &= ~0x40;
+ else
+ data->alarm_mask |= 0x40;
+ data->beep_mask &= data->alarm_mask;
+ gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
+
+ return count;
+}
+
+static DEVICE_ATTR(temp_input1, S_IRUGO, show_temp_input1, NULL);
+static DEVICE_ATTR(temp_max1, S_IWUSR|S_IRUGO, show_temp_max1, set_temp_max1);
+static DEVICE_ATTR(temp_hyst1, S_IWUSR|S_IRUGO,
+ show_temp_hyst1, set_temp_hyst1);
+static DEVICE_ATTR(fan_auto1, S_IWUSR|S_IRUGO, show_fan_auto1, set_fan_auto1);
+static DEVICE_ATTR(fan_input1, S_IRUGO, show_fan_input1, NULL);
+static DEVICE_ATTR(fan_input2, S_IRUGO, show_fan_input2, NULL);
+static DEVICE_ATTR(fan_min1, S_IWUSR|S_IRUGO, show_fan_min1, set_fan_min1);
+static DEVICE_ATTR(fan_min2, S_IWUSR|S_IRUGO, show_fan_min2, set_fan_min2);
+static DEVICE_ATTR(fan_div1, S_IWUSR|S_IRUGO, show_fan_div1, set_fan_div1);
+static DEVICE_ATTR(fan_div2, S_IWUSR|S_IRUGO, show_fan_div2, set_fan_div2);
+static DEVICE_ATTR(in_input0, S_IRUGO, show_in_input0, NULL);
+static DEVICE_ATTR(in_input1, S_IRUGO, show_in_input1, NULL);
+static DEVICE_ATTR(in_input2, S_IRUGO, show_in_input2, NULL);
+static DEVICE_ATTR(in_input3, S_IRUGO, show_in_input3, NULL);
+static DEVICE_ATTR(in_min0, S_IWUSR|S_IRUGO, show_in_min0, set_in_min0);
+static DEVICE_ATTR(in_min1, S_IWUSR|S_IRUGO, show_in_min1, set_in_min1);
+static DEVICE_ATTR(in_min2, S_IWUSR|S_IRUGO, show_in_min2, set_in_min2);
+static DEVICE_ATTR(in_min3, S_IWUSR|S_IRUGO, show_in_min3, set_in_min3);
+static DEVICE_ATTR(in_max0, S_IWUSR|S_IRUGO, show_in_max0, set_in_max0);
+static DEVICE_ATTR(in_max1, S_IWUSR|S_IRUGO, show_in_max1, set_in_max1);
+static DEVICE_ATTR(in_max2, S_IWUSR|S_IRUGO, show_in_max2, set_in_max2);
+static DEVICE_ATTR(in_max3, S_IWUSR|S_IRUGO, show_in_max3, set_in_max3);
+static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
+static DEVICE_ATTR(beep_enable, S_IWUSR|S_IRUGO,
+ show_beep_enable, set_beep_enable);
+static DEVICE_ATTR(beep_mask, S_IWUSR|S_IRUGO,
+ show_beep_mask, set_beep_mask);
+
+/*
+ * Real code
+ */
+
+static int gl518_attach_adapter(struct i2c_adapter *adapter)
+{
+ if (!(adapter->class & I2C_ADAP_CLASS_SMBUS))
+ return 0;
+ return i2c_detect(adapter, &addr_data, gl518_detect);
+}
+
+static int gl518_detect(struct i2c_adapter *adapter, int address, int kind)
+{
+ int i;
+ struct i2c_client *new_client;
+ struct gl518_data *data;
+ int err = 0;
+ const char *name = "";
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
+ I2C_FUNC_SMBUS_WORD_DATA))
+ goto exit;
+
+ /* OK. For now, we presume we have a valid client. We now create the
+ client structure, even though we cannot fill it completely yet.
+ But it allows us to access gl518_{read,write}_value. */
+
+ if (!(new_client = kmalloc(sizeof(struct i2c_client) +
+ sizeof(struct gl518_data),
+ GFP_KERNEL))) {
+ err = -ENOMEM;
+ goto exit;
+ }
+ memset(new_client, 0x00, sizeof(struct i2c_client) +
+ sizeof(struct gl518_data));
+
+ data = (struct gl518_data *) (new_client + 1);
+ i2c_set_clientdata(new_client, data);
+
+ new_client->addr = address;
+ new_client->adapter = adapter;
+ new_client->driver = &gl518_driver;
+ new_client->flags = 0;
+
+ /* Now, we do the remaining detection. */
+
+ if (kind < 0) {
+ if ((gl518_read_value(new_client, GL518_REG_CHIP_ID) != 0x80)
+ || (gl518_read_value(new_client, GL518_REG_CONF) & 0x80))
+ goto exit_free;
+ }
+
+ /* Determine the chip type. */
+ if (kind <= 0) {
+ i = gl518_read_value(new_client, GL518_REG_REVISION);
+ if (i == 0x00) {
+ kind = gl518sm_r00;
+ name = "gl518sm";
+ } else if (i == 0x80) {
+ kind = gl518sm_r80;
+ name = "gl518sm";
+ } else {
+ if (kind <= 0)
+ dev_info(&adapter->dev,
+ "Ignoring 'force' parameter for unknown "
+ "chip at adapter %d, address 0x%02x\n",
+ i2c_adapter_id(adapter), address);
+ goto exit_free;
+ }
+ }
+
+ /* Fill in the remaining client fields */
+ strlcpy(new_client->name, name, I2C_NAME_SIZE);
+ new_client->id = gl518_id++;
+ data->type = kind;
+ data->valid = 0;
+ init_MUTEX(&data->update_lock);
+
+ /* Tell the I2C layer a new client has arrived */
+ if ((err = i2c_attach_client(new_client)))
+ goto exit_free;
+
+ /* Initialize the GL518SM chip */
+ data->alarm_mask = 0xff;
+ data->voltage_in[0]=data->voltage_in[1]=data->voltage_in[2]=0;
+ gl518_init_client((struct i2c_client *) new_client);
+
+ /* Register sysfs hooks */
+ device_create_file(&new_client->dev, &dev_attr_in_input0);
+ device_create_file(&new_client->dev, &dev_attr_in_input1);
+ device_create_file(&new_client->dev, &dev_attr_in_input2);
+ device_create_file(&new_client->dev, &dev_attr_in_input3);
+ device_create_file(&new_client->dev, &dev_attr_in_min0);
+ device_create_file(&new_client->dev, &dev_attr_in_min1);
+ device_create_file(&new_client->dev, &dev_attr_in_min2);
+ device_create_file(&new_client->dev, &dev_attr_in_min3);
+ device_create_file(&new_client->dev, &dev_attr_in_max0);
+ device_create_file(&new_client->dev, &dev_attr_in_max1);
+ device_create_file(&new_client->dev, &dev_attr_in_max2);
+ device_create_file(&new_client->dev, &dev_attr_in_max3);
+ device_create_file(&new_client->dev, &dev_attr_fan_auto1);
+ device_create_file(&new_client->dev, &dev_attr_fan_input1);
+ device_create_file(&new_client->dev, &dev_attr_fan_input2);
+ device_create_file(&new_client->dev, &dev_attr_fan_min1);
+ device_create_file(&new_client->dev, &dev_attr_fan_min2);
+ device_create_file(&new_client->dev, &dev_attr_fan_div1);
+ device_create_file(&new_client->dev, &dev_attr_fan_div2);
+ device_create_file(&new_client->dev, &dev_attr_temp_input1);
+ device_create_file(&new_client->dev, &dev_attr_temp_max1);
+ device_create_file(&new_client->dev, &dev_attr_temp_hyst1);
+ device_create_file(&new_client->dev, &dev_attr_alarms);
+ device_create_file(&new_client->dev, &dev_attr_beep_enable);
+ device_create_file(&new_client->dev, &dev_attr_beep_mask);
+
+ return 0;
+
+/* OK, this is not exactly good programming practice, usually. But it is
+ very code-efficient in this case. */
+
+exit_free:
+ kfree(new_client);
+exit:
+ return err;
+}
+
+
+/* Called when we have found a new GL518SM.
+ Note that we preserve D4:NoFan2 and D2:beep_enable. */
+static void gl518_init_client(struct i2c_client *client)
+{
+ /* Make sure we leave D7:Reset untouched */
+ u8 regvalue = gl518_read_value(client, GL518_REG_CONF) & 0x7f;
+
+ /* Comparator mode (D3=0), standby mode (D6=0) */
+ gl518_write_value(client, GL518_REG_CONF, (regvalue &= 0x37));
+
+ /* Never interrupts */
+ gl518_write_value(client, GL518_REG_MASK, 0x00);
+
+ /* Clear status register (D5=1), start (D6=1) */
+ gl518_write_value(client, GL518_REG_CONF, 0x20 | regvalue);
+ gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
+}
+
+static int gl518_detach_client(struct i2c_client *client)
+{
+ int err;
+
+ if ((err = i2c_detach_client(client))) {
+ dev_err(&client->dev, "Client deregistration failed, "
+ "client not detached.\n");
+ return err;
+ }
+
+ kfree(client);
+
+ return 0;
+}
+
+static inline u16 swap_bytes(u16 val)
+{
+ return (val >> 8) | (val << 8);
+}
+
+/* Registers 0x07 to 0x0c are word-sized, others are byte-sized
+ GL518 uses a high-byte first convention, which is exactly opposite to
+ the usual practice. */
+static int gl518_read_value(struct i2c_client *client, u8 reg)
+{
+ if ((reg >= 0x07) && (reg <= 0x0c))
+ return swap_bytes(i2c_smbus_read_word_data(client, reg));
+ else
+ return i2c_smbus_read_byte_data(client, reg);
+}
+
+/* Registers 0x07 to 0x0c are word-sized, others are byte-sized
+ GL518 uses a high-byte first convention, which is exactly opposite to
+ the usual practice. */
+static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value)
+{
+ if ((reg >= 0x07) && (reg <= 0x0c))
+ return i2c_smbus_write_word_data(client, reg,
+ swap_bytes(value));
+ else
+ return i2c_smbus_write_byte_data(client, reg, value);
+}
+
+static void gl518_update_client(struct i2c_client *client)
+{
+ struct gl518_data *data = i2c_get_clientdata(client);
+ int val;
+
+ down(&data->update_lock);
+
+ if ((jiffies - data->last_updated > HZ + HZ / 2) ||
+ (jiffies < data->last_updated) || !data->valid) {
+ dev_dbg(&client->dev, "Starting gl518 update\n");
+
+ data->alarms = gl518_read_value(client, GL518_REG_INT);
+ data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
+
+ val = gl518_read_value(client, GL518_REG_VDD_LIMIT);
+ data->voltage_min[0] = val & 0xff;
+ data->voltage_max[0] = (val >> 8) & 0xff;
+ val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
+ data->voltage_min[1] = val & 0xff;
+ data->voltage_max[1] = (val >> 8) & 0xff;
+ val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
+ data->voltage_min[2] = val & 0xff;
+ data->voltage_max[2] = (val >> 8) & 0xff;
+ val = gl518_read_value(client, GL518_REG_VIN3_LIMIT);
+ data->voltage_min[3] = val & 0xff;
+ data->voltage_max[3] = (val >> 8) & 0xff;
+
+ val = gl518_read_value(client, GL518_REG_FAN_COUNT);
+ data->fan_in[0] = (val >> 8) & 0xff;
+ data->fan_in[1] = val & 0xff;
+
+ val = gl518_read_value(client, GL518_REG_FAN_LIMIT);
+ data->fan_min[0] = (val >> 8) & 0xff;
+ data->fan_min[1] = val & 0xff;
+
+ data->temp_in = gl518_read_value(client, GL518_REG_TEMP_IN);
+ data->temp_max =
+ gl518_read_value(client, GL518_REG_TEMP_MAX);
+ data->temp_hyst =
+ gl518_read_value(client, GL518_REG_TEMP_HYST);
+
+ val = gl518_read_value(client, GL518_REG_MISC);
+ data->fan_div[0] = (val >> 6) & 0x03;
+ data->fan_div[1] = (val >> 4) & 0x03;
+ data->fan_auto1 = (val >> 3) & 0x01;
+
+ data->alarms &= data->alarm_mask;
+
+ val = gl518_read_value(client, GL518_REG_CONF);
+ data->beep_enable = (val >> 2) & 1;
+
+ if (data->type != gl518sm_r00) {
+ data->voltage_in[0] =
+ gl518_read_value(client, GL518_REG_VDD);
+ data->voltage_in[1] =
+ gl518_read_value(client, GL518_REG_VIN1);
+ data->voltage_in[2] =
+ gl518_read_value(client, GL518_REG_VIN2);
+ }
+ data->voltage_in[3] =
+ gl518_read_value(client, GL518_REG_VIN3);
+
+ data->last_updated = jiffies;
+ data->valid = 1;
+ }
+
+ up(&data->update_lock);
+}
+
+static int __init sensors_gl518sm_init(void)
+{
+ return i2c_add_driver(&gl518_driver);
+}
+
+static void __exit sensors_gl518sm_exit(void)
+{
+ i2c_del_driver(&gl518_driver);
+}
+
+MODULE_AUTHOR("Frodo Looijaard <frodol at dds.nl>, "
+ "Kyosti Malkki <kmalkki at cc.hut.fi> and "
+ "Hong-Gunn Chew <hglinux at gunnet.org>");
+MODULE_DESCRIPTION("GL518SM driver");
+MODULE_LICENSE("GPL");
+
+module_init(sensors_gl518sm_init);
+module_exit(sensors_gl518sm_exit);
--
Jean Delvare
http://www.ensicaen.ismra.fr/~delvare/
