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authorLinus Torvalds <torvalds@linux-foundation.org>2009-12-08 08:12:16 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-08 08:12:16 -0800
commit41440ffe21f29bdb985cab76b2d0b06d83e63b19 (patch)
tree1d7d1ff6f699ccbabb71c7bc4172f7d15bc4bc45 /drivers/misc
parentdad3de7d0090280f44ff27131ed2878f1ab6ddad (diff)
parent6471b68982d3bb1a593c3e183c804ecf830125d3 (diff)
downloadblackbird-op-linux-41440ffe21f29bdb985cab76b2d0b06d83e63b19.tar.gz
blackbird-op-linux-41440ffe21f29bdb985cab76b2d0b06d83e63b19.zip
Merge branch 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging
* 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging: i2c-stub: Documentation update i2c-stub: Allow user to disable some commands i2c-stub: Implement I2C block support i2c: Refactor for_each callbacks i2c-i801: Retry on lost arbitration i2c: Remove big kernel lock from i2cdev_open ics932s401: Clean up detect function i2c: Simplify i2c_detect_address i2c: Drop probe, ignore and force module parameters i2c: Add missing __devinit markers to old i2c adapter drivers i2c: Bus drivers don't have to support I2C_M_REV_DIR_ADDR i2c: Prevent priority inversion on top of bus lock i2c-voodoo3: Delete i2c-powermac: Drop temporary name buffer i2c-powermac: Include the i2c_adapter in struct pmac_i2c_bus i2c-powermac: Log errors i2c-powermac: Refactor i2c_powermac_smbus_xfer i2c-powermac: Reject unsupported I2C transactions i2c/chips: Move ds1682 to drivers/misc
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/Kconfig10
-rw-r--r--drivers/misc/Makefile1
-rw-r--r--drivers/misc/ds1682.c267
-rw-r--r--drivers/misc/ics932s401.c37
4 files changed, 293 insertions, 22 deletions
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index a2ea383105a6..2c16ca6501d5 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -246,6 +246,16 @@ config EP93XX_PWM
To compile this driver as a module, choose M here: the module will
be called ep93xx_pwm.
+config DS1682
+ tristate "Dallas DS1682 Total Elapsed Time Recorder with Alarm"
+ depends on I2C && 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.
+
source "drivers/misc/c2port/Kconfig"
source "drivers/misc/eeprom/Kconfig"
source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index e311267a355f..906a0edcea40 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_SGI_GRU) += sgi-gru/
obj-$(CONFIG_HP_ILO) += hpilo.o
obj-$(CONFIG_ISL29003) += isl29003.o
obj-$(CONFIG_EP93XX_PWM) += ep93xx_pwm.o
+obj-$(CONFIG_DS1682) += ds1682.o
obj-$(CONFIG_C2PORT) += c2port/
obj-$(CONFIG_IWMC3200TOP) += iwmc3200top/
obj-y += eeprom/
diff --git a/drivers/misc/ds1682.c b/drivers/misc/ds1682.c
new file mode 100644
index 000000000000..f3ee4a1abb77
--- /dev/null
+++ b/drivers/misc/ds1682.c
@@ -0,0 +1,267 @@
+/*
+ * 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",
+ ((unsigned long long)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, struct bin_attribute *attr,
+ 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, struct bin_attribute *attr,
+ 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,
+ },
+ .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,
+ const struct i2c_device_id *id)
+{
+ 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 const struct i2c_device_id ds1682_id[] = {
+ { "ds1682", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ds1682_id);
+
+static struct i2c_driver ds1682_driver = {
+ .driver = {
+ .name = "ds1682",
+ },
+ .probe = ds1682_probe,
+ .remove = ds1682_remove,
+ .id_table = ds1682_id,
+};
+
+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);
diff --git a/drivers/misc/ics932s401.c b/drivers/misc/ics932s401.c
index 6e43ab4231ae..4bb7a3af9ad9 100644
--- a/drivers/misc/ics932s401.c
+++ b/drivers/misc/ics932s401.c
@@ -417,32 +417,25 @@ static int ics932s401_detect(struct i2c_client *client, int kind,
struct i2c_board_info *info)
{
struct i2c_adapter *adapter = client->adapter;
+ int vendor, device, revision;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
- if (kind <= 0) {
- int vendor, device, revision;
-
- vendor = i2c_smbus_read_word_data(client,
- ICS932S401_REG_VENDOR_REV);
- vendor >>= 8;
- revision = vendor >> ICS932S401_REV_SHIFT;
- vendor &= ICS932S401_VENDOR_MASK;
- if (vendor != ICS932S401_VENDOR)
- return -ENODEV;
-
- device = i2c_smbus_read_word_data(client,
- ICS932S401_REG_DEVICE);
- device >>= 8;
- if (device != ICS932S401_DEVICE)
- return -ENODEV;
-
- if (revision != ICS932S401_REV)
- dev_info(&adapter->dev, "Unknown revision %d\n",
- revision);
- } else
- dev_dbg(&adapter->dev, "detection forced\n");
+ vendor = i2c_smbus_read_word_data(client, ICS932S401_REG_VENDOR_REV);
+ vendor >>= 8;
+ revision = vendor >> ICS932S401_REV_SHIFT;
+ vendor &= ICS932S401_VENDOR_MASK;
+ if (vendor != ICS932S401_VENDOR)
+ return -ENODEV;
+
+ device = i2c_smbus_read_word_data(client, ICS932S401_REG_DEVICE);
+ device >>= 8;
+ if (device != ICS932S401_DEVICE)
+ return -ENODEV;
+
+ if (revision != ICS932S401_REV)
+ dev_info(&adapter->dev, "Unknown revision %d\n", revision);
strlcpy(info->type, "ics932s401", I2C_NAME_SIZE);
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