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-rw-r--r--drivers/hwmon/lm78.c1033
1 files changed, 1033 insertions, 0 deletions
diff --git a/drivers/hwmon/lm78.c b/drivers/hwmon/lm78.c
new file mode 100644
index 000000000..694e171ca
--- /dev/null
+++ b/drivers/hwmon/lm78.c
@@ -0,0 +1,1033 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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>
+ */
+
+#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;
+ bool valid; /* true 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 in_show(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 in_min_show(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 in_max_show(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 in_min_store(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 in_max_store(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;
+}
+
+static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
+static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
+static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
+static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
+static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
+static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
+static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
+static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
+static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
+static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
+static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
+static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
+static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
+static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
+static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
+static SENSOR_DEVICE_ATTR_RO(in5_input, in, 5);
+static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
+static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
+static SENSOR_DEVICE_ATTR_RO(in6_input, in, 6);
+static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6);
+static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6);
+
+/* Temperature */
+static ssize_t temp1_input_show(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 temp1_max_show(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 temp1_max_store(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 temp1_max_hyst_show(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 temp1_max_hyst_store(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_RO(temp1_input);
+static DEVICE_ATTR_RW(temp1_max);
+static DEVICE_ATTR_RW(temp1_max_hyst);
+
+/* 3 Fans */
+static ssize_t fan_show(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 fan_min_show(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 fan_min_store(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 fan_div_show(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 fan_div_store(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;
+}
+
+static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
+static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
+static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
+static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
+static SENSOR_DEVICE_ATTR_RO(fan3_input, fan, 2);
+static SENSOR_DEVICE_ATTR_RW(fan3_min, fan_min, 2);
+
+/* Fan 3 divisor is locked in H/W */
+static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
+static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
+static SENSOR_DEVICE_ATTR_RO(fan3_div, fan_div, 2);
+
+/* VID */
+static ssize_t cpu0_vid_show(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_RO(cpu0_vid);
+
+/* Alarms */
+static ssize_t alarms_show(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_RO(alarms);
+
+static ssize_t alarm_show(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_RO(in0_alarm, alarm, 0);
+static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
+static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
+static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
+static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
+static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9);
+static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 10);
+static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
+static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
+static SENSOR_DEVICE_ATTR_RO(fan3_alarm, alarm, 11);
+static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 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);
+
+ strscpy(info->type, client_name, I2C_NAME_SIZE);
+
+ return 0;
+
+ err_nodev:
+ if (isa)
+ mutex_unlock(&isa->update_lock);
+ return -ENODEV;
+}
+
+static const struct i2c_device_id lm78_i2c_id[];
+
+static int lm78_i2c_probe(struct i2c_client *client)
+{
+ 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 = i2c_match_id(lm78_i2c_id, client)->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_new = 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 = true;
+
+ 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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 07:51:18 +0000