diff options
Diffstat (limited to 'drivers/hwmon/lm78.c')
| -rw-r--r-- | drivers/hwmon/lm78.c | 1047 |
1 files changed, 1047 insertions, 0 deletions
diff --git a/drivers/hwmon/lm78.c b/drivers/hwmon/lm78.c new file mode 100644 index 000000000..539efe4ad --- /dev/null +++ b/drivers/hwmon/lm78.c @@ -0,0 +1,1047 @@ +/* + * lm78.c - Part of lm_sensors, Linux kernel modules for hardware + * monitoring + * Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> + * Copyright (c) 2007, 2011 Jean Delvare <jdelvare@suse.de> + * + * 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. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/jiffies.h> +#include <linux/i2c.h> +#include <linux/hwmon.h> +#include <linux/hwmon-vid.h> +#include <linux/hwmon-sysfs.h> +#include <linux/err.h> +#include <linux/mutex.h> + +#ifdef CONFIG_ISA +#include <linux/platform_device.h> +#include <linux/ioport.h> +#include <linux/io.h> +#endif + +/* Addresses to scan */ +static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, + 0x2e, 0x2f, I2C_CLIENT_END }; +enum chips { lm78, 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 = clamp_val(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; + if (rpm > 1350000) + return 1; + return clamp_val((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(long val) +{ + int nval = clamp_val(val, -128000, 127000) ; + return nval < 0 ? (nval - 500) / 1000 : (nval + 500) / 1000; +} + +static inline int TEMP_FROM_REG(s8 val) +{ + return val * 1000; +} + +#define DIV_FROM_REG(val) (1 << (val)) + +struct lm78_data { + struct i2c_client *client; + struct mutex lock; + enum chips type; + + /* For ISA device only */ + const char *name; + int isa_addr; + + struct mutex 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_read_value(struct lm78_data *data, u8 reg); +static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value); +static struct lm78_data *lm78_update_device(struct device *dev); +static void lm78_init_device(struct lm78_data *data); + + +/* 7 Voltages */ +static ssize_t show_in(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct lm78_data *data = lm78_update_device(dev); + return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index])); +} + +static ssize_t show_in_min(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct lm78_data *data = lm78_update_device(dev); + return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index])); +} + +static ssize_t show_in_max(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct lm78_data *data = lm78_update_device(dev); + return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index])); +} + +static ssize_t set_in_min(struct device *dev, struct device_attribute *da, + const char *buf, size_t count) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct lm78_data *data = dev_get_drvdata(dev); + int nr = attr->index; + unsigned long val; + int err; + + err = kstrtoul(buf, 10, &val); + if (err) + return err; + + mutex_lock(&data->update_lock); + data->in_min[nr] = IN_TO_REG(val); + lm78_write_value(data, LM78_REG_IN_MIN(nr), data->in_min[nr]); + mutex_unlock(&data->update_lock); + return count; +} + +static ssize_t set_in_max(struct device *dev, struct device_attribute *da, + const char *buf, size_t count) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct lm78_data *data = dev_get_drvdata(dev); + int nr = attr->index; + unsigned long val; + int err; + + err = kstrtoul(buf, 10, &val); + if (err) + return err; + + mutex_lock(&data->update_lock); + data->in_max[nr] = IN_TO_REG(val); + lm78_write_value(data, LM78_REG_IN_MAX(nr), data->in_max[nr]); + mutex_unlock(&data->update_lock); + return count; +} + +#define show_in_offset(offset) \ +static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \ + show_in, NULL, offset); \ +static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \ + show_in_min, set_in_min, offset); \ +static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \ + show_in_max, set_in_max, offset); + +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, struct device_attribute *da, + 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, struct device_attribute *da, + 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, struct device_attribute *da, + const char *buf, size_t count) +{ + struct lm78_data *data = dev_get_drvdata(dev); + long val; + int err; + + err = kstrtol(buf, 10, &val); + if (err) + return err; + + mutex_lock(&data->update_lock); + data->temp_over = TEMP_TO_REG(val); + lm78_write_value(data, LM78_REG_TEMP_OVER, data->temp_over); + mutex_unlock(&data->update_lock); + return count; +} + +static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *da, + 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, struct device_attribute *da, + const char *buf, size_t count) +{ + struct lm78_data *data = dev_get_drvdata(dev); + long val; + int err; + + err = kstrtol(buf, 10, &val); + if (err) + return err; + + mutex_lock(&data->update_lock); + data->temp_hyst = TEMP_TO_REG(val); + lm78_write_value(data, LM78_REG_TEMP_HYST, data->temp_hyst); + mutex_unlock(&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, struct device_attribute *da, + char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct lm78_data *data = lm78_update_device(dev); + int nr = attr->index; + 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, struct device_attribute *da, + char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct lm78_data *data = lm78_update_device(dev); + int nr = attr->index; + 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, struct device_attribute *da, + const char *buf, size_t count) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct lm78_data *data = dev_get_drvdata(dev); + int nr = attr->index; + unsigned long val; + int err; + + err = kstrtoul(buf, 10, &val); + if (err) + return err; + + mutex_lock(&data->update_lock); + data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr])); + lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]); + mutex_unlock(&data->update_lock); + return count; +} + +static ssize_t show_fan_div(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct lm78_data *data = lm78_update_device(dev); + return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index])); +} + +/* + * 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 surprise; the user doesn't expect the fan minimum to change just + * because the divisor changed. + */ +static ssize_t set_fan_div(struct device *dev, struct device_attribute *da, + const char *buf, size_t count) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct lm78_data *data = dev_get_drvdata(dev); + int nr = attr->index; + unsigned long min; + u8 reg; + unsigned long val; + int err; + + err = kstrtoul(buf, 10, &val); + if (err) + return err; + + mutex_lock(&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(dev, + "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n", + val); + mutex_unlock(&data->update_lock); + return -EINVAL; + } + + reg = lm78_read_value(data, 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(data, LM78_REG_VID_FANDIV, reg); + + data->fan_min[nr] = + FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr])); + lm78_write_value(data, LM78_REG_FAN_MIN(nr), data->fan_min[nr]); + mutex_unlock(&data->update_lock); + + return count; +} + +#define show_fan_offset(offset) \ +static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \ + show_fan, NULL, offset - 1); \ +static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \ + show_fan_min, set_fan_min, offset - 1); + +show_fan_offset(1); +show_fan_offset(2); +show_fan_offset(3); + +/* Fan 3 divisor is locked in H/W */ +static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR, + show_fan_div, set_fan_div, 0); +static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR, + show_fan_div, set_fan_div, 1); +static SENSOR_DEVICE_ATTR(fan3_div, S_IRUGO, show_fan_div, NULL, 2); + +/* VID */ +static ssize_t show_vid(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct lm78_data *data = lm78_update_device(dev); + return sprintf(buf, "%d\n", vid_from_reg(data->vid, 82)); +} +static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); + +/* Alarms */ +static ssize_t show_alarms(struct device *dev, struct device_attribute *da, + 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); + +static ssize_t show_alarm(struct device *dev, struct device_attribute *da, + char *buf) +{ + struct lm78_data *data = lm78_update_device(dev); + int nr = to_sensor_dev_attr(da)->index; + return sprintf(buf, "%u\n", (data->alarms >> nr) & 1); +} +static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0); +static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1); +static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2); +static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3); +static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8); +static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9); +static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 10); +static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6); +static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7); +static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11); +static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4); + +static struct attribute *lm78_attrs[] = { + &sensor_dev_attr_in0_input.dev_attr.attr, + &sensor_dev_attr_in0_min.dev_attr.attr, + &sensor_dev_attr_in0_max.dev_attr.attr, + &sensor_dev_attr_in0_alarm.dev_attr.attr, + &sensor_dev_attr_in1_input.dev_attr.attr, + &sensor_dev_attr_in1_min.dev_attr.attr, + &sensor_dev_attr_in1_max.dev_attr.attr, + &sensor_dev_attr_in1_alarm.dev_attr.attr, + &sensor_dev_attr_in2_input.dev_attr.attr, + &sensor_dev_attr_in2_min.dev_attr.attr, + &sensor_dev_attr_in2_max.dev_attr.attr, + &sensor_dev_attr_in2_alarm.dev_attr.attr, + &sensor_dev_attr_in3_input.dev_attr.attr, + &sensor_dev_attr_in3_min.dev_attr.attr, + &sensor_dev_attr_in3_max.dev_attr.attr, + &sensor_dev_attr_in3_alarm.dev_attr.attr, + &sensor_dev_attr_in4_input.dev_attr.attr, + &sensor_dev_attr_in4_min.dev_attr.attr, + &sensor_dev_attr_in4_max.dev_attr.attr, + &sensor_dev_attr_in4_alarm.dev_attr.attr, + &sensor_dev_attr_in5_input.dev_attr.attr, + &sensor_dev_attr_in5_min.dev_attr.attr, + &sensor_dev_attr_in5_max.dev_attr.attr, + &sensor_dev_attr_in5_alarm.dev_attr.attr, + &sensor_dev_attr_in6_input.dev_attr.attr, + &sensor_dev_attr_in6_min.dev_attr.attr, + &sensor_dev_attr_in6_max.dev_attr.attr, + &sensor_dev_attr_in6_alarm.dev_attr.attr, + &dev_attr_temp1_input.attr, + &dev_attr_temp1_max.attr, + &dev_attr_temp1_max_hyst.attr, + &sensor_dev_attr_temp1_alarm.dev_attr.attr, + &sensor_dev_attr_fan1_input.dev_attr.attr, + &sensor_dev_attr_fan1_min.dev_attr.attr, + &sensor_dev_attr_fan1_div.dev_attr.attr, + &sensor_dev_attr_fan1_alarm.dev_attr.attr, + &sensor_dev_attr_fan2_input.dev_attr.attr, + &sensor_dev_attr_fan2_min.dev_attr.attr, + &sensor_dev_attr_fan2_div.dev_attr.attr, + &sensor_dev_attr_fan2_alarm.dev_attr.attr, + &sensor_dev_attr_fan3_input.dev_attr.attr, + &sensor_dev_attr_fan3_min.dev_attr.attr, + &sensor_dev_attr_fan3_div.dev_attr.attr, + &sensor_dev_attr_fan3_alarm.dev_attr.attr, + &dev_attr_alarms.attr, + &dev_attr_cpu0_vid.attr, + + NULL +}; + +ATTRIBUTE_GROUPS(lm78); + +/* + * ISA related code + */ +#ifdef CONFIG_ISA + +/* ISA device, if found */ +static struct platform_device *pdev; + +static unsigned short isa_address = 0x290; + +static struct lm78_data *lm78_data_if_isa(void) +{ + return pdev ? platform_get_drvdata(pdev) : NULL; +} + +/* Returns 1 if the I2C chip appears to be an alias of the ISA chip */ +static int lm78_alias_detect(struct i2c_client *client, u8 chipid) +{ + struct lm78_data *isa; + int i; + + if (!pdev) /* No ISA chip */ + return 0; + isa = platform_get_drvdata(pdev); + + if (lm78_read_value(isa, LM78_REG_I2C_ADDR) != client->addr) + return 0; /* Address doesn't match */ + if ((lm78_read_value(isa, LM78_REG_CHIPID) & 0xfe) != (chipid & 0xfe)) + return 0; /* Chip type doesn't match */ + + /* + * We compare all the limit registers, the config register and the + * interrupt mask registers + */ + for (i = 0x2b; i <= 0x3d; i++) { + if (lm78_read_value(isa, i) != + i2c_smbus_read_byte_data(client, i)) + return 0; + } + if (lm78_read_value(isa, LM78_REG_CONFIG) != + i2c_smbus_read_byte_data(client, LM78_REG_CONFIG)) + return 0; + for (i = 0x43; i <= 0x46; i++) { + if (lm78_read_value(isa, i) != + i2c_smbus_read_byte_data(client, i)) + return 0; + } + + return 1; +} +#else /* !CONFIG_ISA */ + +static int lm78_alias_detect(struct i2c_client *client, u8 chipid) +{ + return 0; +} + +static struct lm78_data *lm78_data_if_isa(void) +{ + return NULL; +} +#endif /* CONFIG_ISA */ + +static int lm78_i2c_detect(struct i2c_client *client, + struct i2c_board_info *info) +{ + int i; + struct lm78_data *isa = lm78_data_if_isa(); + const char *client_name; + struct i2c_adapter *adapter = client->adapter; + int address = client->addr; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -ENODEV; + + /* + * We block updates of the ISA device to minimize the risk of + * concurrent access to the same LM78 chip through different + * interfaces. + */ + if (isa) + mutex_lock(&isa->update_lock); + + if ((i2c_smbus_read_byte_data(client, LM78_REG_CONFIG) & 0x80) + || i2c_smbus_read_byte_data(client, LM78_REG_I2C_ADDR) != address) + goto err_nodev; + + /* Explicitly prevent the misdetection of Winbond chips */ + i = i2c_smbus_read_byte_data(client, 0x4f); + if (i == 0xa3 || i == 0x5c) + goto err_nodev; + + /* Determine the chip type. */ + i = i2c_smbus_read_byte_data(client, LM78_REG_CHIPID); + if (i == 0x00 || i == 0x20 /* LM78 */ + || i == 0x40) /* LM78-J */ + client_name = "lm78"; + else if ((i & 0xfe) == 0xc0) + client_name = "lm79"; + else + goto err_nodev; + + if (lm78_alias_detect(client, i)) { + dev_dbg(&adapter->dev, + "Device at 0x%02x appears to be the same as ISA device\n", + address); + goto err_nodev; + } + + if (isa) + mutex_unlock(&isa->update_lock); + + strlcpy(info->type, client_name, I2C_NAME_SIZE); + + return 0; + + err_nodev: + if (isa) + mutex_unlock(&isa->update_lock); + return -ENODEV; +} + +static int lm78_i2c_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device *dev = &client->dev; + struct device *hwmon_dev; + struct lm78_data *data; + + data = devm_kzalloc(dev, sizeof(struct lm78_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->client = client; + data->type = id->driver_data; + + /* Initialize the LM78 chip */ + lm78_init_device(data); + + hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, + data, lm78_groups); + return PTR_ERR_OR_ZERO(hwmon_dev); +} + +static const struct i2c_device_id lm78_i2c_id[] = { + { "lm78", lm78 }, + { "lm79", lm79 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, lm78_i2c_id); + +static struct i2c_driver lm78_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = "lm78", + }, + .probe = lm78_i2c_probe, + .id_table = lm78_i2c_id, + .detect = lm78_i2c_detect, + .address_list = normal_i2c, +}; + +/* + * The SMBus locks itself, but ISA access must be locked explicitly! + * 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 lm78_data *data, u8 reg) +{ + struct i2c_client *client = data->client; + +#ifdef CONFIG_ISA + if (!client) { /* ISA device */ + int res; + mutex_lock(&data->lock); + outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET); + res = inb_p(data->isa_addr + LM78_DATA_REG_OFFSET); + mutex_unlock(&data->lock); + return res; + } else +#endif + return i2c_smbus_read_byte_data(client, reg); +} + +static int lm78_write_value(struct lm78_data *data, u8 reg, u8 value) +{ + struct i2c_client *client = data->client; + +#ifdef CONFIG_ISA + if (!client) { /* ISA device */ + mutex_lock(&data->lock); + outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET); + outb_p(value, data->isa_addr + LM78_DATA_REG_OFFSET); + mutex_unlock(&data->lock); + return 0; + } else +#endif + return i2c_smbus_write_byte_data(client, reg, value); +} + +static void lm78_init_device(struct lm78_data *data) +{ + u8 config; + int i; + + /* Start monitoring */ + config = lm78_read_value(data, LM78_REG_CONFIG); + if ((config & 0x09) != 0x01) + lm78_write_value(data, LM78_REG_CONFIG, + (config & 0xf7) | 0x01); + + /* A few vars need to be filled upon startup */ + for (i = 0; i < 3; i++) { + data->fan_min[i] = lm78_read_value(data, + LM78_REG_FAN_MIN(i)); + } + + mutex_init(&data->update_lock); +} + +static struct lm78_data *lm78_update_device(struct device *dev) +{ + struct lm78_data *data = dev_get_drvdata(dev); + int i; + + mutex_lock(&data->update_lock); + + if (time_after(jiffies, data->last_updated + HZ + HZ / 2) + || !data->valid) { + + dev_dbg(dev, "Starting lm78 update\n"); + + for (i = 0; i <= 6; i++) { + data->in[i] = + lm78_read_value(data, LM78_REG_IN(i)); + data->in_min[i] = + lm78_read_value(data, LM78_REG_IN_MIN(i)); + data->in_max[i] = + lm78_read_value(data, LM78_REG_IN_MAX(i)); + } + for (i = 0; i < 3; i++) { + data->fan[i] = + lm78_read_value(data, LM78_REG_FAN(i)); + data->fan_min[i] = + lm78_read_value(data, LM78_REG_FAN_MIN(i)); + } + data->temp = lm78_read_value(data, LM78_REG_TEMP); + data->temp_over = + lm78_read_value(data, LM78_REG_TEMP_OVER); + data->temp_hyst = + lm78_read_value(data, LM78_REG_TEMP_HYST); + i = lm78_read_value(data, LM78_REG_VID_FANDIV); + data->vid = i & 0x0f; + if (data->type == lm79) + data->vid |= + (lm78_read_value(data, 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(data, LM78_REG_ALARM1) + + (lm78_read_value(data, LM78_REG_ALARM2) << 8); + data->last_updated = jiffies; + data->valid = 1; + + data->fan_div[2] = 1; + } + + mutex_unlock(&data->update_lock); + + return data; +} + +#ifdef CONFIG_ISA +static int lm78_isa_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device *hwmon_dev; + struct lm78_data *data; + struct resource *res; + + /* Reserve the ISA region */ + res = platform_get_resource(pdev, IORESOURCE_IO, 0); + if (!devm_request_region(dev, res->start + LM78_ADDR_REG_OFFSET, + 2, "lm78")) + return -EBUSY; + + data = devm_kzalloc(dev, sizeof(struct lm78_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + mutex_init(&data->lock); + data->isa_addr = res->start; + platform_set_drvdata(pdev, data); + + if (lm78_read_value(data, LM78_REG_CHIPID) & 0x80) { + data->type = lm79; + data->name = "lm79"; + } else { + data->type = lm78; + data->name = "lm78"; + } + + /* Initialize the LM78 chip */ + lm78_init_device(data); + + hwmon_dev = devm_hwmon_device_register_with_groups(dev, data->name, + data, lm78_groups); + return PTR_ERR_OR_ZERO(hwmon_dev); +} + +static struct platform_driver lm78_isa_driver = { + .driver = { + .name = "lm78", + }, + .probe = lm78_isa_probe, +}; + +/* return 1 if a supported chip is found, 0 otherwise */ +static int __init lm78_isa_found(unsigned short address) +{ + int val, save, found = 0; + int port; + + /* + * Some boards declare base+0 to base+7 as a PNP device, some base+4 + * to base+7 and some base+5 to base+6. So we better request each port + * individually for the probing phase. + */ + for (port = address; port < address + LM78_EXTENT; port++) { + if (!request_region(port, 1, "lm78")) { + pr_debug("Failed to request port 0x%x\n", port); + goto release; + } + } + +#define REALLY_SLOW_IO + /* + * We need the timeouts for at least some LM78-like + * chips. But only if we read 'undefined' registers. + */ + val = inb_p(address + 1); + if (inb_p(address + 2) != val + || inb_p(address + 3) != val + || inb_p(address + 7) != val) + goto release; +#undef REALLY_SLOW_IO + + /* + * We should be able to change the 7 LSB of the address port. The + * MSB (busy flag) should be clear initially, set after the write. + */ + save = inb_p(address + LM78_ADDR_REG_OFFSET); + if (save & 0x80) + goto release; + val = ~save & 0x7f; + outb_p(val, address + LM78_ADDR_REG_OFFSET); + if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) { + outb_p(save, address + LM78_ADDR_REG_OFFSET); + goto release; + } + + /* We found a device, now see if it could be an LM78 */ + outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET); + val = inb_p(address + LM78_DATA_REG_OFFSET); + if (val & 0x80) + goto release; + outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET); + val = inb_p(address + LM78_DATA_REG_OFFSET); + if (val < 0x03 || val > 0x77) /* Not a valid I2C address */ + goto release; + + /* The busy flag should be clear again */ + if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80) + goto release; + + /* Explicitly prevent the misdetection of Winbond chips */ + outb_p(0x4f, address + LM78_ADDR_REG_OFFSET); + val = inb_p(address + LM78_DATA_REG_OFFSET); + if (val == 0xa3 || val == 0x5c) + goto release; + + /* Explicitly prevent the misdetection of ITE chips */ + outb_p(0x58, address + LM78_ADDR_REG_OFFSET); + val = inb_p(address + LM78_DATA_REG_OFFSET); + if (val == 0x90) + goto release; + + /* Determine the chip type */ + outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET); + val = inb_p(address + LM78_DATA_REG_OFFSET); + if (val == 0x00 || val == 0x20 /* LM78 */ + || val == 0x40 /* LM78-J */ + || (val & 0xfe) == 0xc0) /* LM79 */ + found = 1; + + if (found) + pr_info("Found an %s chip at %#x\n", + val & 0x80 ? "LM79" : "LM78", (int)address); + + release: + for (port--; port >= address; port--) + release_region(port, 1); + return found; +} + +static int __init lm78_isa_device_add(unsigned short address) +{ + struct resource res = { + .start = address, + .end = address + LM78_EXTENT - 1, + .name = "lm78", + .flags = IORESOURCE_IO, + }; + int err; + + pdev = platform_device_alloc("lm78", address); + if (!pdev) { + err = -ENOMEM; + pr_err("Device allocation failed\n"); + goto exit; + } + + err = platform_device_add_resources(pdev, &res, 1); + if (err) { + pr_err("Device resource addition failed (%d)\n", err); + goto exit_device_put; + } + + err = platform_device_add(pdev); + if (err) { + pr_err("Device addition failed (%d)\n", err); + goto exit_device_put; + } + + return 0; + + exit_device_put: + platform_device_put(pdev); + exit: + pdev = NULL; + return err; +} + +static int __init lm78_isa_register(void) +{ + int res; + + if (lm78_isa_found(isa_address)) { + res = platform_driver_register(&lm78_isa_driver); + if (res) + goto exit; + + /* Sets global pdev as a side effect */ + res = lm78_isa_device_add(isa_address); + if (res) + goto exit_unreg_isa_driver; + } + + return 0; + + exit_unreg_isa_driver: + platform_driver_unregister(&lm78_isa_driver); + exit: + return res; +} + +static void lm78_isa_unregister(void) +{ + if (pdev) { + platform_device_unregister(pdev); + platform_driver_unregister(&lm78_isa_driver); + } +} +#else /* !CONFIG_ISA */ + +static int __init lm78_isa_register(void) +{ + return 0; +} + +static void lm78_isa_unregister(void) +{ +} +#endif /* CONFIG_ISA */ + +static int __init sm_lm78_init(void) +{ + int res; + + /* + * We register the ISA device first, so that we can skip the + * registration of an I2C interface to the same device. + */ + res = lm78_isa_register(); + if (res) + goto exit; + + res = i2c_add_driver(&lm78_driver); + if (res) + goto exit_unreg_isa_device; + + return 0; + + exit_unreg_isa_device: + lm78_isa_unregister(); + exit: + return res; +} + +static void __exit sm_lm78_exit(void) +{ + lm78_isa_unregister(); + i2c_del_driver(&lm78_driver); +} + +MODULE_AUTHOR("Frodo Looijaard, Jean Delvare <jdelvare@suse.de>"); +MODULE_DESCRIPTION("LM78/LM79 driver"); +MODULE_LICENSE("GPL"); + +module_init(sm_lm78_init); +module_exit(sm_lm78_exit); |