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-rw-r--r--drivers/hwmon/lm78.c1126
1 files changed, 1126 insertions, 0 deletions
diff --git a/drivers/hwmon/lm78.c b/drivers/hwmon/lm78.c
new file mode 100644
index 00000000..f6bc414e
--- /dev/null
+++ b/drivers/hwmon/lm78.c
@@ -0,0 +1,1126 @@
+/*
+ * 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 <khali@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.
+ */
+
+#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 = 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;
+}
+
+#define DIV_FROM_REG(val) (1 << (val))
+
+struct lm78_data {
+ struct i2c_client *client;
+ struct device *hwmon_dev;
+ 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_attributes[] = {
+ &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
+};
+
+static const struct attribute_group lm78_group = {
+ .attrs = lm78_attributes,
+};
+
+/*
+ * ISA related code
+ */
+#ifdef CONFIG_ISA
+
+/* ISA device, if found */
+static struct platform_device *pdev;
+
+static unsigned short isa_address = 0x290;
+
+/*
+ * I2C devices get this name attribute automatically, but for ISA devices
+ * we must create it by ourselves.
+ */
+static ssize_t show_name(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct lm78_data *data = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%s\n", data->name);
+}
+static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
+
+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 lm78_data *data;
+ int err;
+
+ data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, data);
+ data->client = client;
+ data->type = id->driver_data;
+
+ /* Initialize the LM78 chip */
+ lm78_init_device(data);
+
+ /* Register sysfs hooks */
+ err = sysfs_create_group(&client->dev.kobj, &lm78_group);
+ if (err)
+ goto ERROR3;
+
+ data->hwmon_dev = hwmon_device_register(&client->dev);
+ if (IS_ERR(data->hwmon_dev)) {
+ err = PTR_ERR(data->hwmon_dev);
+ goto ERROR4;
+ }
+
+ return 0;
+
+ERROR4:
+ sysfs_remove_group(&client->dev.kobj, &lm78_group);
+ERROR3:
+ kfree(data);
+ return err;
+}
+
+static int lm78_i2c_remove(struct i2c_client *client)
+{
+ struct lm78_data *data = i2c_get_clientdata(client);
+
+ hwmon_device_unregister(data->hwmon_dev);
+ sysfs_remove_group(&client->dev.kobj, &lm78_group);
+ kfree(data);
+
+ return 0;
+}
+
+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,
+ .remove = lm78_i2c_remove,
+ .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 __devinit lm78_isa_probe(struct platform_device *pdev)
+{
+ int err;
+ struct lm78_data *data;
+ struct resource *res;
+
+ /* Reserve the ISA region */
+ res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (!request_region(res->start + LM78_ADDR_REG_OFFSET, 2, "lm78")) {
+ err = -EBUSY;
+ goto exit;
+ }
+
+ data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL);
+ if (!data) {
+ err = -ENOMEM;
+ goto exit_release_region;
+ }
+ 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);
+
+ /* Register sysfs hooks */
+ err = sysfs_create_group(&pdev->dev.kobj, &lm78_group);
+ if (err)
+ goto exit_remove_files;
+ err = device_create_file(&pdev->dev, &dev_attr_name);
+ if (err)
+ goto exit_remove_files;
+
+ data->hwmon_dev = hwmon_device_register(&pdev->dev);
+ if (IS_ERR(data->hwmon_dev)) {
+ err = PTR_ERR(data->hwmon_dev);
+ goto exit_remove_files;
+ }
+
+ return 0;
+
+ exit_remove_files:
+ sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
+ device_remove_file(&pdev->dev, &dev_attr_name);
+ kfree(data);
+ exit_release_region:
+ release_region(res->start + LM78_ADDR_REG_OFFSET, 2);
+ exit:
+ return err;
+}
+
+static int __devexit lm78_isa_remove(struct platform_device *pdev)
+{
+ struct lm78_data *data = platform_get_drvdata(pdev);
+ struct resource *res;
+
+ hwmon_device_unregister(data->hwmon_dev);
+ sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
+ device_remove_file(&pdev->dev, &dev_attr_name);
+ kfree(data);
+
+ res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ release_region(res->start + LM78_ADDR_REG_OFFSET, 2);
+
+ return 0;
+}
+
+static struct platform_driver lm78_isa_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "lm78",
+ },
+ .probe = lm78_isa_probe,
+ .remove = __devexit_p(lm78_isa_remove),
+};
+
+/* 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 <khali@linux-fr.org>");
+MODULE_DESCRIPTION("LM78/LM79 driver");
+MODULE_LICENSE("GPL");
+
+module_init(sm_lm78_init);
+module_exit(sm_lm78_exit);
generated by cgit (git 2.34.1) at 2024-12-20 10:37:52 +0000