i2c: New DS1682 chip driver
Grant Likely [Thu, 12 Jul 2007 12:12:29 +0000 (14:12 +0200)]
A driver for the Dallas DS1682 elapsed time recorder chip.

Tested on a MPC5200 based board using the integrated i2c adapter.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

drivers/i2c/chips/Kconfig
drivers/i2c/chips/Makefile
drivers/i2c/chips/ds1682.c [new file with mode: 0644]

index 8113ce2..09fbc59 100644 (file)
@@ -30,6 +30,16 @@ config SENSORS_DS1374
          This driver is deprecated and will be dropped soon. Use
          rtc-ds1374 instead.
 
+config DS1682
+       tristate "Dallas DS1682 Total Elapsed Time Recorder with Alarm"
+       depends on EXPERIMENTAL
+       help
+         If you say yes here you get support for Dallas Semiconductor
+         DS1682 Total Elapsed Time Recorder.
+
+         This driver can also be built as a module.  If so, the module
+         will be called ds1682.
+
 config SENSORS_EEPROM
        tristate "EEPROM reader"
        depends on EXPERIMENTAL
index 779868e..cc54a4d 100644 (file)
@@ -4,6 +4,7 @@
 
 obj-$(CONFIG_SENSORS_DS1337)   += ds1337.o
 obj-$(CONFIG_SENSORS_DS1374)   += ds1374.o
+obj-$(CONFIG_DS1682)           += ds1682.o
 obj-$(CONFIG_SENSORS_EEPROM)   += eeprom.o
 obj-$(CONFIG_SENSORS_MAX6875)  += max6875.o
 obj-$(CONFIG_SENSORS_M41T00)   += m41t00.o
diff --git a/drivers/i2c/chips/ds1682.c b/drivers/i2c/chips/ds1682.c
new file mode 100644 (file)
index 0000000..25fd467
--- /dev/null
@@ -0,0 +1,259 @@
+/*
+ * Dallas Semiconductor DS1682 Elapsed Time Recorder device driver
+ *
+ * Written by: Grant Likely <grant.likely@secretlab.ca>
+ *
+ * Copyright (C) 2007 Secret Lab Technologies Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * The DS1682 elapsed timer recorder is a simple device that implements
+ * one elapsed time counter, one event counter, an alarm signal and 10
+ * bytes of general purpose EEPROM.
+ *
+ * This driver provides access to the DS1682 counters and user data via
+ * the sysfs.  The following attributes are added to the device node:
+ *     elapsed_time (u32): Total elapsed event time in ms resolution
+ *     alarm_time (u32): When elapsed time exceeds the value in alarm_time,
+ *                       then the alarm pin is asserted.
+ *     event_count (u16): number of times the event pin has gone low.
+ *     eeprom (u8[10]): general purpose EEPROM
+ *
+ * Counter registers and user data are both read/write unless the device
+ * has been write protected.  This driver does not support turning off write
+ * protection.  Once write protection is turned on, it is impossible to
+ * turn it off again, so I have left the feature out of this driver to avoid
+ * accidental enabling, but it is trivial to add write protect support.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/string.h>
+#include <linux/list.h>
+#include <linux/sysfs.h>
+#include <linux/ctype.h>
+#include <linux/hwmon-sysfs.h>
+
+/* Device registers */
+#define DS1682_REG_CONFIG              0x00
+#define DS1682_REG_ALARM               0x01
+#define DS1682_REG_ELAPSED             0x05
+#define DS1682_REG_EVT_CNTR            0x09
+#define DS1682_REG_EEPROM              0x0b
+#define DS1682_REG_RESET               0x1d
+#define DS1682_REG_WRITE_DISABLE       0x1e
+#define DS1682_REG_WRITE_MEM_DISABLE   0x1f
+
+#define DS1682_EEPROM_SIZE             10
+
+/*
+ * Generic counter attributes
+ */
+static ssize_t ds1682_show(struct device *dev, struct device_attribute *attr,
+                          char *buf)
+{
+       struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+       struct i2c_client *client = to_i2c_client(dev);
+       __le32 val = 0;
+       int rc;
+
+       dev_dbg(dev, "ds1682_show() called on %s\n", attr->attr.name);
+
+       /* Read the register */
+       rc = i2c_smbus_read_i2c_block_data(client, sattr->index, sattr->nr,
+                                          (u8 *) & val);
+       if (rc < 0)
+               return -EIO;
+
+       /* Special case: the 32 bit regs are time values with 1/4s
+        * resolution, scale them up to milliseconds */
+       if (sattr->nr == 4)
+               return sprintf(buf, "%llu\n", ((u64) le32_to_cpu(val)) * 250);
+
+       /* Format the output string and return # of bytes */
+       return sprintf(buf, "%li\n", (long)le32_to_cpu(val));
+}
+
+static ssize_t ds1682_store(struct device *dev, struct device_attribute *attr,
+                           const char *buf, size_t count)
+{
+       struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+       struct i2c_client *client = to_i2c_client(dev);
+       char *endp;
+       u64 val;
+       __le32 val_le;
+       int rc;
+
+       dev_dbg(dev, "ds1682_store() called on %s\n", attr->attr.name);
+
+       /* Decode input */
+       val = simple_strtoull(buf, &endp, 0);
+       if (buf == endp) {
+               dev_dbg(dev, "input string not a number\n");
+               return -EINVAL;
+       }
+
+       /* Special case: the 32 bit regs are time values with 1/4s
+        * resolution, scale input down to quarter-seconds */
+       if (sattr->nr == 4)
+               do_div(val, 250);
+
+       /* write out the value */
+       val_le = cpu_to_le32(val);
+       rc = i2c_smbus_write_i2c_block_data(client, sattr->index, sattr->nr,
+                                           (u8 *) & val_le);
+       if (rc < 0) {
+               dev_err(dev, "register write failed; reg=0x%x, size=%i\n",
+                       sattr->index, sattr->nr);
+               return -EIO;
+       }
+
+       return count;
+}
+
+/*
+ * Simple register attributes
+ */
+static SENSOR_DEVICE_ATTR_2(elapsed_time, S_IRUGO | S_IWUSR, ds1682_show,
+                           ds1682_store, 4, DS1682_REG_ELAPSED);
+static SENSOR_DEVICE_ATTR_2(alarm_time, S_IRUGO | S_IWUSR, ds1682_show,
+                           ds1682_store, 4, DS1682_REG_ALARM);
+static SENSOR_DEVICE_ATTR_2(event_count, S_IRUGO | S_IWUSR, ds1682_show,
+                           ds1682_store, 2, DS1682_REG_EVT_CNTR);
+
+static const struct attribute_group ds1682_group = {
+       .attrs = (struct attribute *[]) {
+               &sensor_dev_attr_elapsed_time.dev_attr.attr,
+               &sensor_dev_attr_alarm_time.dev_attr.attr,
+               &sensor_dev_attr_event_count.dev_attr.attr,
+               NULL,
+       },
+};
+
+/*
+ * User data attribute
+ */
+static ssize_t ds1682_eeprom_read(struct kobject *kobj, char *buf, loff_t off,
+                                 size_t count)
+{
+       struct i2c_client *client = kobj_to_i2c_client(kobj);
+       int rc;
+
+       dev_dbg(&client->dev, "ds1682_eeprom_read(p=%p, off=%lli, c=%zi)\n",
+               buf, off, count);
+
+       if (off >= DS1682_EEPROM_SIZE)
+               return 0;
+
+       if (off + count > DS1682_EEPROM_SIZE)
+               count = DS1682_EEPROM_SIZE - off;
+
+       rc = i2c_smbus_read_i2c_block_data(client, DS1682_REG_EEPROM + off,
+                                          count, buf);
+       if (rc < 0)
+               return -EIO;
+
+       return count;
+}
+
+static ssize_t ds1682_eeprom_write(struct kobject *kobj, char *buf, loff_t off,
+                                  size_t count)
+{
+       struct i2c_client *client = kobj_to_i2c_client(kobj);
+
+       dev_dbg(&client->dev, "ds1682_eeprom_write(p=%p, off=%lli, c=%zi)\n",
+               buf, off, count);
+
+       if (off >= DS1682_EEPROM_SIZE)
+               return -ENOSPC;
+
+       if (off + count > DS1682_EEPROM_SIZE)
+               count = DS1682_EEPROM_SIZE - off;
+
+       /* Write out to the device */
+       if (i2c_smbus_write_i2c_block_data(client, DS1682_REG_EEPROM + off,
+                                          count, buf) < 0)
+               return -EIO;
+
+       return count;
+}
+
+static struct bin_attribute ds1682_eeprom_attr = {
+       .attr = {
+               .name = "eeprom",
+               .mode = S_IRUGO | S_IWUSR,
+               .owner = THIS_MODULE,
+       },
+       .size = DS1682_EEPROM_SIZE,
+       .read = ds1682_eeprom_read,
+       .write = ds1682_eeprom_write,
+};
+
+/*
+ * Called when a ds1682 device is matched with this driver
+ */
+static int ds1682_probe(struct i2c_client *client)
+{
+       int rc;
+
+       if (!i2c_check_functionality(client->adapter,
+                                    I2C_FUNC_SMBUS_I2C_BLOCK)) {
+               dev_err(&client->dev, "i2c bus does not support the ds1682\n");
+               rc = -ENODEV;
+               goto exit;
+       }
+
+       rc = sysfs_create_group(&client->dev.kobj, &ds1682_group);
+       if (rc)
+               goto exit;
+
+       rc = sysfs_create_bin_file(&client->dev.kobj, &ds1682_eeprom_attr);
+       if (rc)
+               goto exit_bin_attr;
+
+       return 0;
+
+ exit_bin_attr:
+       sysfs_remove_group(&client->dev.kobj, &ds1682_group);
+ exit:
+       return rc;
+}
+
+static int ds1682_remove(struct i2c_client *client)
+{
+       sysfs_remove_bin_file(&client->dev.kobj, &ds1682_eeprom_attr);
+       sysfs_remove_group(&client->dev.kobj, &ds1682_group);
+       return 0;
+}
+
+static struct i2c_driver ds1682_driver = {
+       .driver = {
+               .name = "ds1682",
+       },
+       .probe = ds1682_probe,
+       .remove = ds1682_remove,
+};
+
+static int __init ds1682_init(void)
+{
+       return i2c_add_driver(&ds1682_driver);
+}
+
+static void __exit ds1682_exit(void)
+{
+       i2c_del_driver(&ds1682_driver);
+}
+
+MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
+MODULE_DESCRIPTION("DS1682 Elapsed Time Indicator driver");
+MODULE_LICENSE("GPL");
+
+module_init(ds1682_init);
+module_exit(ds1682_exit);