diff options
Diffstat (limited to 'drivers/i2c/chips/lm78.c')
| -rw-r--r-- | drivers/i2c/chips/lm78.c | 796 |
1 files changed, 796 insertions, 0 deletions
diff --git a/drivers/i2c/chips/lm78.c b/drivers/i2c/chips/lm78.c new file mode 100644 index 000000000000..6d52d14eb31c --- /dev/null +++ b/drivers/i2c/chips/lm78.c @@ -0,0 +1,796 @@ +/* + lm78.c - Part of lm_sensors, Linux kernel modules for hardware + monitoring + Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> + + 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 <linux/config.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/jiffies.h> +#include <linux/i2c.h> +#include <linux/i2c-sensor.h> +#include <asm/io.h> + +/* Addresses to scan */ +static unsigned short normal_i2c[] = { 0x20, 0x21, 0x22, 0x23, 0x24, + 0x25, 0x26, 0x27, 0x28, 0x29, + 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, + 0x2f, I2C_CLIENT_END }; +static unsigned int normal_isa[] = { 0x0290, I2C_CLIENT_ISA_END }; + +/* Insmod parameters */ +SENSORS_INSMOD_3(lm78, lm78j, lm79); + +/* Many LM78 constants specified below */ + +/* Length of ISA address segment */ +#define LM78_EXTENT 8 + +/* Where are the ISA address/data registers relative to the base address */ +#define LM78_ADDR_REG_OFFSET 5 +#define LM78_DATA_REG_OFFSET 6 + +/* The LM78 registers */ +#define LM78_REG_IN_MAX(nr) (0x2b + (nr) * 2) +#define LM78_REG_IN_MIN(nr) (0x2c + (nr) * 2) +#define LM78_REG_IN(nr) (0x20 + (nr)) + +#define LM78_REG_FAN_MIN(nr) (0x3b + (nr)) +#define LM78_REG_FAN(nr) (0x28 + (nr)) + +#define LM78_REG_TEMP 0x27 +#define LM78_REG_TEMP_OVER 0x39 +#define LM78_REG_TEMP_HYST 0x3a + +#define LM78_REG_ALARM1 0x41 +#define LM78_REG_ALARM2 0x42 + +#define LM78_REG_VID_FANDIV 0x47 + +#define LM78_REG_CONFIG 0x40 +#define LM78_REG_CHIPID 0x49 +#define LM78_REG_I2C_ADDR 0x48 + + +/* Conversions. Rounding and limit checking is only done on the TO_REG + variants. */ + +/* IN: mV, (0V to 4.08V) + REG: 16mV/bit */ +static inline u8 IN_TO_REG(unsigned long val) +{ + unsigned long nval = SENSORS_LIMIT(val, 0, 4080); + return (nval + 8) / 16; +} +#define IN_FROM_REG(val) ((val) * 16) + +static inline u8 FAN_TO_REG(long rpm, int div) +{ + if (rpm <= 0) + return 255; + return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254); +} + +static inline int FAN_FROM_REG(u8 val, int div) +{ + return val==0 ? -1 : val==255 ? 0 : 1350000/(val*div); +} + +/* TEMP: mC (-128C to +127C) + REG: 1C/bit, two's complement */ +static inline s8 TEMP_TO_REG(int val) +{ + int nval = SENSORS_LIMIT(val, -128000, 127000) ; + return nval<0 ? (nval-500)/1000 : (nval+500)/1000; +} + +static inline int TEMP_FROM_REG(s8 val) +{ + return val * 1000; +} + +/* VID: mV + REG: (see doc/vid) */ +static inline int VID_FROM_REG(u8 val) +{ + return val==0x1f ? 0 : val>=0x10 ? 5100-val*100 : 2050-val*50; +} + +#define DIV_FROM_REG(val) (1 << (val)) + +/* There are some complications in a module like this. First off, LM78 chips + may be both present on the SMBus and the ISA bus, and we have to handle + those cases separately at some places. Second, there might be several + LM78 chips available (well, actually, that is probably never done; but + it is a clean illustration of how to handle a case like that). Finally, + a specific chip may be attached to *both* ISA and SMBus, and we would + not like to detect it double. Fortunately, in the case of the LM78 at + least, a register tells us what SMBus address we are on, so that helps + a bit - except if there could be more than one SMBus. Groan. No solution + for this yet. */ + +/* This module may seem overly long and complicated. In fact, it is not so + bad. Quite a lot of bookkeeping is done. A real driver can often cut + some corners. */ + +/* For each registered LM78, we need to keep some data in memory. That + data is pointed to by lm78_list[NR]->data. The structure itself is + dynamically allocated, at the same time when a new lm78 client is + allocated. */ +struct lm78_data { + struct i2c_client client; + struct semaphore lock; + enum chips type; + + struct semaphore update_lock; + char valid; /* !=0 if following fields are valid */ + unsigned long last_updated; /* In jiffies */ + + u8 in[7]; /* Register value */ + u8 in_max[7]; /* Register value */ + u8 in_min[7]; /* Register value */ + u8 fan[3]; /* Register value */ + u8 fan_min[3]; /* Register value */ + s8 temp; /* Register value */ + s8 temp_over; /* Register value */ + s8 temp_hyst; /* Register value */ + u8 fan_div[3]; /* Register encoding, shifted right */ + u8 vid; /* Register encoding, combined */ + u16 alarms; /* Register encoding, combined */ +}; + + +static int lm78_attach_adapter(struct i2c_adapter *adapter); +static int lm78_detect(struct i2c_adapter *adapter, int address, int kind); +static int lm78_detach_client(struct i2c_client *client); + +static int lm78_read_value(struct i2c_client *client, u8 register); +static int lm78_write_value(struct i2c_client *client, u8 register, u8 value); +static struct lm78_data *lm78_update_device(struct device *dev); +static void lm78_init_client(struct i2c_client *client); + + +static struct i2c_driver lm78_driver = { + .owner = THIS_MODULE, + .name = "lm78", + .id = I2C_DRIVERID_LM78, + .flags = I2C_DF_NOTIFY, + .attach_adapter = lm78_attach_adapter, + .detach_client = lm78_detach_client, +}; + +/* 7 Voltages */ +static ssize_t show_in(struct device *dev, char *buf, int nr) +{ + struct lm78_data *data = lm78_update_device(dev); + return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr])); +} + +static ssize_t show_in_min(struct device *dev, char *buf, int nr) +{ + struct lm78_data *data = lm78_update_device(dev); + return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr])); +} + +static ssize_t show_in_max(struct device *dev, char *buf, int nr) +{ + struct lm78_data *data = lm78_update_device(dev); + return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr])); +} + +static ssize_t set_in_min(struct device *dev, const char *buf, + size_t count, int nr) +{ + struct i2c_client *client = to_i2c_client(dev); + struct lm78_data *data = i2c_get_clientdata(client); + unsigned long val = simple_strtoul(buf, NULL, 10); + + down(&data->update_lock); + data->in_min[nr] = IN_TO_REG(val); + lm78_write_value(client, LM78_REG_IN_MIN(nr), data->in_min[nr]); + up(&data->update_lock); + return count; +} + +static ssize_t set_in_max(struct device *dev, const char *buf, + size_t count, int nr) +{ + struct i2c_client *client = to_i2c_client(dev); + struct lm78_data *data = i2c_get_clientdata(client); + unsigned long val = simple_strtoul(buf, NULL, 10); + + down(&data->update_lock); + data->in_max[nr] = IN_TO_REG(val); + lm78_write_value(client, LM78_REG_IN_MAX(nr), data->in_max[nr]); + up(&data->update_lock); + return count; +} + +#define show_in_offset(offset) \ +static ssize_t \ + show_in##offset (struct device *dev, char *buf) \ +{ \ + return show_in(dev, buf, offset); \ +} \ +static DEVICE_ATTR(in##offset##_input, S_IRUGO, \ + show_in##offset, NULL); \ +static ssize_t \ + show_in##offset##_min (struct device *dev, char *buf) \ +{ \ + return show_in_min(dev, buf, offset); \ +} \ +static ssize_t \ + show_in##offset##_max (struct device *dev, char *buf) \ +{ \ + return show_in_max(dev, buf, offset); \ +} \ +static ssize_t set_in##offset##_min (struct device *dev, \ + const char *buf, size_t count) \ +{ \ + return set_in_min(dev, buf, count, offset); \ +} \ +static ssize_t set_in##offset##_max (struct device *dev, \ + const char *buf, size_t count) \ +{ \ + return set_in_max(dev, buf, count, offset); \ +} \ +static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \ + show_in##offset##_min, set_in##offset##_min); \ +static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \ + show_in##offset##_max, set_in##offset##_max); + +show_in_offset(0); +show_in_offset(1); +show_in_offset(2); +show_in_offset(3); +show_in_offset(4); +show_in_offset(5); +show_in_offset(6); + +/* Temperature */ +static ssize_t show_temp(struct device *dev, char *buf) +{ + struct lm78_data *data = lm78_update_device(dev); + return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp)); +} + +static ssize_t show_temp_over(struct device *dev, char *buf) +{ + struct lm78_data *data = lm78_update_device(dev); + return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_over)); +} + +static ssize_t set_temp_over(struct device *dev, const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct lm78_data *data = i2c_get_clientdata(client); + long val = simple_strtol(buf, NULL, 10); + + down(&data->update_lock); + data->temp_over = TEMP_TO_REG(val); + lm78_write_value(client, LM78_REG_TEMP_OVER, data->temp_over); + up(&data->update_lock); + return count; +} + +static ssize_t show_temp_hyst(struct device *dev, char *buf) +{ + struct lm78_data *data = lm78_update_device(dev); + return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_hyst)); +} + +static ssize_t set_temp_hyst(struct device *dev, const char *buf, size_t count) +{ + struct i2c_client *client = to_i2c_client(dev); + struct lm78_data *data = i2c_get_clientdata(client); + long val = simple_strtol(buf, NULL, 10); + + down(&data->update_lock); + data->temp_hyst = TEMP_TO_REG(val); + lm78_write_value(client, LM78_REG_TEMP_HYST, data->temp_hyst); + up(&data->update_lock); + return count; +} + +static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); +static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, + show_temp_over, set_temp_over); +static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, + show_temp_hyst, set_temp_hyst); + +/* 3 Fans */ +static ssize_t show_fan(struct device *dev, char *buf, int nr) +{ + struct lm78_data *data = lm78_update_device(dev); + return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr], + DIV_FROM_REG(data->fan_div[nr])) ); +} + +static ssize_t show_fan_min(struct device *dev, char *buf, int nr) +{ + struct lm78_data *data = lm78_update_device(dev); + return sprintf(buf,"%d\n", FAN_FROM_REG(data->fan_min[nr], + DIV_FROM_REG(data->fan_div[nr])) ); +} + +static ssize_t set_fan_min(struct device *dev, const char *buf, + size_t count, int nr) +{ + struct i2c_client *client = to_i2c_client(dev); + struct lm78_data *data = i2c_get_clientdata(client); + unsigned long val = simple_strtoul(buf, NULL, 10); + + down(&data->update_lock); + data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr])); + lm78_write_value(client, LM78_REG_FAN_MIN(nr), data->fan_min[nr]); + up(&data->update_lock); + return count; +} + +static ssize_t show_fan_div(struct device *dev, char *buf, int nr) +{ + struct lm78_data *data = lm78_update_device(dev); + return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]) ); +} + +/* Note: we save and restore the fan minimum here, because its value is + determined in part by the fan divisor. This follows the principle of + least suprise; the user doesn't expect the fan minimum to change just + because the divisor changed. */ +static ssize_t set_fan_div(struct device *dev, const char *buf, + size_t count, int nr) +{ + struct i2c_client *client = to_i2c_client(dev); + struct lm78_data *data = i2c_get_clientdata(client); + unsigned long val = simple_strtoul(buf, NULL, 10); + unsigned long min; + u8 reg; + + down(&data->update_lock); + min = FAN_FROM_REG(data->fan_min[nr], + DIV_FROM_REG(data->fan_div[nr])); + + switch (val) { + case 1: data->fan_div[nr] = 0; break; + case 2: data->fan_div[nr] = 1; break; + case 4: data->fan_div[nr] = 2; break; + case 8: data->fan_div[nr] = 3; break; + default: + dev_err(&client->dev, "fan_div value %ld not " + "supported. Choose one of 1, 2, 4 or 8!\n", val); + up(&data->update_lock); + return -EINVAL; + } + + reg = lm78_read_value(client, LM78_REG_VID_FANDIV); + switch (nr) { + case 0: + reg = (reg & 0xcf) | (data->fan_div[nr] << 4); + break; + case 1: + reg = (reg & 0x3f) | (data->fan_div[nr] << 6); + break; + } + lm78_write_value(client, LM78_REG_VID_FANDIV, reg); + + data->fan_min[nr] = + FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr])); + lm78_write_value(client, LM78_REG_FAN_MIN(nr), data->fan_min[nr]); + up(&data->update_lock); + + return count; +} + +#define show_fan_offset(offset) \ +static ssize_t show_fan_##offset (struct device *dev, char *buf) \ +{ \ + return show_fan(dev, buf, offset - 1); \ +} \ +static ssize_t show_fan_##offset##_min (struct device *dev, char *buf) \ +{ \ + return show_fan_min(dev, buf, offset - 1); \ +} \ +static ssize_t show_fan_##offset##_div (struct device *dev, char *buf) \ +{ \ + return show_fan_div(dev, buf, offset - 1); \ +} \ +static ssize_t set_fan_##offset##_min (struct device *dev, \ + const char *buf, size_t count) \ +{ \ + return set_fan_min(dev, buf, count, offset - 1); \ +} \ +static DEVICE_ATTR(fan##offset##_input, S_IRUGO, show_fan_##offset, NULL);\ +static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \ + show_fan_##offset##_min, set_fan_##offset##_min); + +static ssize_t set_fan_1_div(struct device *dev, const char *buf, + size_t count) +{ + return set_fan_div(dev, buf, count, 0) ; +} + +static ssize_t set_fan_2_div(struct device *dev, const char *buf, + size_t count) +{ + return set_fan_div(dev, buf, count, 1) ; +} + +show_fan_offset(1); +show_fan_offset(2); +show_fan_offset(3); + +/* Fan 3 divisor is locked in H/W */ +static DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR, + show_fan_1_div, set_fan_1_div); +static DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR, + show_fan_2_div, set_fan_2_div); +static DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_3_div, NULL); + +/* VID */ +static ssize_t show_vid(struct device *dev, char *buf) +{ + struct lm78_data *data = lm78_update_device(dev); + return sprintf(buf, "%d\n", VID_FROM_REG(data->vid)); +} +static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); + +/* Alarms */ +static ssize_t show_alarms(struct device *dev, char *buf) +{ + struct lm78_data *data = lm78_update_device(dev); + return sprintf(buf, "%u\n", data->alarms); +} +static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); + +/* This function is called when: + * lm78_driver is inserted (when this module is loaded), for each + available adapter + * when a new adapter is inserted (and lm78_driver is still present) */ +static int lm78_attach_adapter(struct i2c_adapter *adapter) +{ + if (!(adapter->class & I2C_CLASS_HWMON)) + return 0; + return i2c_detect(adapter, &addr_data, lm78_detect); +} + +/* This function is called by i2c_detect */ +int lm78_detect(struct i2c_adapter *adapter, int address, int kind) +{ + int i, err; + struct i2c_client *new_client; + struct lm78_data *data; + const char *client_name = ""; + int is_isa = i2c_is_isa_adapter(adapter); + + if (!is_isa && + !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { + err = -ENODEV; + goto ERROR0; + } + + /* Reserve the ISA region */ + if (is_isa) + if (!request_region(address, LM78_EXTENT, lm78_driver.name)) { + err = -EBUSY; + goto ERROR0; + } + + /* Probe whether there is anything available on this address. Already + done for SMBus clients */ + if (kind < 0) { + if (is_isa) { + +#define REALLY_SLOW_IO + /* We need the timeouts for at least some LM78-like + chips. But only if we read 'undefined' registers. */ + i = inb_p(address + 1); + if (inb_p(address + 2) != i) { + err = -ENODEV; + goto ERROR1; + } + if (inb_p(address + 3) != i) { + err = -ENODEV; + goto ERROR1; + } + if (inb_p(address + 7) != i) { + err = -ENODEV; + goto ERROR1; + } +#undef REALLY_SLOW_IO + + /* Let's just hope nothing breaks here */ + i = inb_p(address + 5) & 0x7f; + outb_p(~i & 0x7f, address + 5); + if ((inb_p(address + 5) & 0x7f) != (~i & 0x7f)) { + outb_p(i, address + 5); + err = -ENODEV; + goto ERROR1; + } + } + } + + /* 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 lm78_{read,write}_value. */ + + if (!(data = kmalloc(sizeof(struct lm78_data), GFP_KERNEL))) { + err = -ENOMEM; + goto ERROR1; + } + memset(data, 0, sizeof(struct lm78_data)); + + new_client = &data->client; + if (is_isa) + init_MUTEX(&data->lock); + i2c_set_clientdata(new_client, data); + new_client->addr = address; + new_client->adapter = adapter; + new_client->driver = &lm78_driver; + new_client->flags = 0; + + /* Now, we do the remaining detection. */ + if (kind < 0) { + if (lm78_read_value(new_client, LM78_REG_CONFIG) & 0x80) { + err = -ENODEV; + goto ERROR2; + } + if (!is_isa && (lm78_read_value( + new_client, LM78_REG_I2C_ADDR) != address)) { + err = -ENODEV; + goto ERROR2; + } + } + + /* Determine the chip type. */ + if (kind <= 0) { + i = lm78_read_value(new_client, LM78_REG_CHIPID); + if (i == 0x00 || i == 0x20) + kind = lm78; + else if (i == 0x40) + kind = lm78j; + else if ((i & 0xfe) == 0xc0) + kind = lm79; + else { + if (kind == 0) + dev_warn(&adapter->dev, "Ignoring 'force' " + "parameter for unknown chip at " + "adapter %d, address 0x%02x\n", + i2c_adapter_id(adapter), address); + err = -ENODEV; + goto ERROR2; + } + } + + if (kind == lm78) { + client_name = "lm78"; + } else if (kind == lm78j) { + client_name = "lm78-j"; + } else if (kind == lm79) { + client_name = "lm79"; + } + + /* Fill in the remaining client fields and put into the global list */ + strlcpy(new_client->name, client_name, I2C_NAME_SIZE); + 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 ERROR2; + + /* Initialize the LM78 chip */ + lm78_init_client(new_client); + + /* A few vars need to be filled upon startup */ + for (i = 0; i < 3; i++) { + data->fan_min[i] = lm78_read_value(new_client, + LM78_REG_FAN_MIN(i)); + } + + /* Register sysfs hooks */ + device_create_file(&new_client->dev, &dev_attr_in0_input); + device_create_file(&new_client->dev, &dev_attr_in0_min); + device_create_file(&new_client->dev, &dev_attr_in0_max); + device_create_file(&new_client->dev, &dev_attr_in1_input); + device_create_file(&new_client->dev, &dev_attr_in1_min); + device_create_file(&new_client->dev, &dev_attr_in1_max); + device_create_file(&new_client->dev, &dev_attr_in2_input); + device_create_file(&new_client->dev, &dev_attr_in2_min); + device_create_file(&new_client->dev, &dev_attr_in2_max); + device_create_file(&new_client->dev, &dev_attr_in3_input); + device_create_file(&new_client->dev, &dev_attr_in3_min); + device_create_file(&new_client->dev, &dev_attr_in3_max); + device_create_file(&new_client->dev, &dev_attr_in4_input); + device_create_file(&new_client->dev, &dev_attr_in4_min); + device_create_file(&new_client->dev, &dev_attr_in4_max); + device_create_file(&new_client->dev, &dev_attr_in5_input); + device_create_file(&new_client->dev, &dev_attr_in5_min); + device_create_file(&new_client->dev, &dev_attr_in5_max); + device_create_file(&new_client->dev, &dev_attr_in6_input); + device_create_file(&new_client->dev, &dev_attr_in6_min); + device_create_file(&new_client->dev, &dev_attr_in6_max); + device_create_file(&new_client->dev, &dev_attr_temp1_input); + device_create_file(&new_client->dev, &dev_attr_temp1_max); + device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst); + device_create_file(&new_client->dev, &dev_attr_fan1_input); + device_create_file(&new_client->dev, &dev_attr_fan1_min); + device_create_file(&new_client->dev, &dev_attr_fan1_div); + device_create_file(&new_client->dev, &dev_attr_fan2_input); + device_create_file(&new_client->dev, &dev_attr_fan2_min); + device_create_file(&new_client->dev, &dev_attr_fan2_div); + device_create_file(&new_client->dev, &dev_attr_fan3_input); + device_create_file(&new_client->dev, &dev_attr_fan3_min); + device_create_file(&new_client->dev, &dev_attr_fan3_div); + device_create_file(&new_client->dev, &dev_attr_alarms); + device_create_file(&new_client->dev, &dev_attr_cpu0_vid); + + return 0; + +ERROR2: + kfree(data); +ERROR1: + if (is_isa) + release_region(address, LM78_EXTENT); +ERROR0: + return err; +} + +static int lm78_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; + } + + if(i2c_is_isa_client(client)) + release_region(client->addr, LM78_EXTENT); + + kfree(i2c_get_clientdata(client)); + + return 0; +} + +/* The SMBus locks itself, but ISA access must be locked explicitely! + We don't want to lock the whole ISA bus, so we lock each client + separately. + We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks, + would slow down the LM78 access and should not be necessary. */ +static int lm78_read_value(struct i2c_client *client, u8 reg) +{ + int res; + if (i2c_is_isa_client(client)) { + struct lm78_data *data = i2c_get_clientdata(client); + down(&data->lock); + outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET); + res = inb_p(client->addr + LM78_DATA_REG_OFFSET); + up(&data->lock); + return res; + } else + return i2c_smbus_read_byte_data(client, reg); +} + +/* The SMBus locks itself, but ISA access muse be locked explicitely! + We don't want to lock the whole ISA bus, so we lock each client + separately. + We ignore the LM78 BUSY flag at this moment - it could lead to deadlocks, + would slow down the LM78 access and should not be necessary. + There are some ugly typecasts here, but the good new is - they should + nowhere else be necessary! */ +static int lm78_write_value(struct i2c_client *client, u8 reg, u8 value) +{ + if (i2c_is_isa_client(client)) { + struct lm78_data *data = i2c_get_clientdata(client); + down(&data->lock); + outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET); + outb_p(value, client->addr + LM78_DATA_REG_OFFSET); + up(&data->lock); + return 0; + } else + return i2c_smbus_write_byte_data(client, reg, value); +} + +/* Called when we have found a new LM78. It should set limits, etc. */ +static void lm78_init_client(struct i2c_client *client) +{ + u8 config = lm78_read_value(client, LM78_REG_CONFIG); + + /* Start monitoring */ + if (!(config & 0x01)) + lm78_write_value(client, LM78_REG_CONFIG, + (config & 0xf7) | 0x01); +} + +static struct lm78_data *lm78_update_device(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct lm78_data *data = i2c_get_clientdata(client); + int i; + + down(&data->update_lock); + + if (time_after(jiffies, data->last_updated + HZ + HZ / 2) + || !data->valid) { + + dev_dbg(&client->dev, "Starting lm78 update\n"); + + for (i = 0; i <= 6; i++) { + data->in[i] = + lm78_read_value(client, LM78_REG_IN(i)); + data->in_min[i] = + lm78_read_value(client, LM78_REG_IN_MIN(i)); + data->in_max[i] = + lm78_read_value(client, LM78_REG_IN_MAX(i)); + } + for (i = 0; i < 3; i++) { + data->fan[i] = + lm78_read_value(client, LM78_REG_FAN(i)); + data->fan_min[i] = + lm78_read_value(client, LM78_REG_FAN_MIN(i)); + } + data->temp = lm78_read_value(client, LM78_REG_TEMP); + data->temp_over = + lm78_read_value(client, LM78_REG_TEMP_OVER); + data->temp_hyst = + lm78_read_value(client, LM78_REG_TEMP_HYST); + i = lm78_read_value(client, LM78_REG_VID_FANDIV); + data->vid = i & 0x0f; + if (data->type == lm79) + data->vid |= + (lm78_read_value(client, LM78_REG_CHIPID) & + 0x01) << 4; + else + data->vid |= 0x10; + data->fan_div[0] = (i >> 4) & 0x03; + data->fan_div[1] = i >> 6; + data->alarms = lm78_read_value(client, LM78_REG_ALARM1) + + (lm78_read_value(client, LM78_REG_ALARM2) << 8); + data->last_updated = jiffies; + data->valid = 1; + + data->fan_div[2] = 1; + } + + up(&data->update_lock); + + return data; +} + +static int __init sm_lm78_init(void) +{ + return i2c_add_driver(&lm78_driver); +} + +static void __exit sm_lm78_exit(void) +{ + i2c_del_driver(&lm78_driver); +} + + + +MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); +MODULE_DESCRIPTION("LM78, LM78-J and LM79 driver"); +MODULE_LICENSE("GPL"); + +module_init(sm_lm78_init); +module_exit(sm_lm78_exit); |