Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / w1 / slaves / w1_ds2781.c

diff --git a/kernel/drivers/w1/slaves/w1_ds2781.c b/kernel/drivers/w1/slaves/w1_ds2781.c
new file mode 100644 (file)
index 0000000..1eb98fb
--- /dev/null
+++ b/kernel/drivers/w1/slaves/w1_ds2781.c
@@ -0,0 +1,189 @@
+/*
+ * 1-Wire implementation for the ds2781 chip
+ *
+ * Author: Renata Sayakhova <renata@oktetlabs.ru>
+ *
+ * Based on w1-ds2780 driver
+ *
+ * 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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/idr.h>
+
+#include "../w1.h"
+#include "../w1_int.h"
+#include "../w1_family.h"
+#include "w1_ds2781.h"
+
+static int w1_ds2781_do_io(struct device *dev, char *buf, int addr,
+                       size_t count, int io)
+{
+       struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+
+       if (addr > DS2781_DATA_SIZE || addr < 0)
+               return 0;
+
+       count = min_t(int, count, DS2781_DATA_SIZE - addr);
+
+       if (w1_reset_select_slave(sl) == 0) {
+               if (io) {
+                       w1_write_8(sl->master, W1_DS2781_WRITE_DATA);
+                       w1_write_8(sl->master, addr);
+                       w1_write_block(sl->master, buf, count);
+               } else {
+                       w1_write_8(sl->master, W1_DS2781_READ_DATA);
+                       w1_write_8(sl->master, addr);
+                       count = w1_read_block(sl->master, buf, count);
+               }
+       }
+
+       return count;
+}
+
+int w1_ds2781_io(struct device *dev, char *buf, int addr, size_t count,
+                       int io)
+{
+       struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+       int ret;
+
+       if (!dev)
+               return -ENODEV;
+
+       mutex_lock(&sl->master->bus_mutex);
+
+       ret = w1_ds2781_do_io(dev, buf, addr, count, io);
+
+       mutex_unlock(&sl->master->bus_mutex);
+
+       return ret;
+}
+EXPORT_SYMBOL(w1_ds2781_io);
+
+int w1_ds2781_eeprom_cmd(struct device *dev, int addr, int cmd)
+{
+       struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+
+       if (!dev)
+               return -EINVAL;
+
+       mutex_lock(&sl->master->bus_mutex);
+
+       if (w1_reset_select_slave(sl) == 0) {
+               w1_write_8(sl->master, cmd);
+               w1_write_8(sl->master, addr);
+       }
+
+       mutex_unlock(&sl->master->bus_mutex);
+       return 0;
+}
+EXPORT_SYMBOL(w1_ds2781_eeprom_cmd);
+
+static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
+                            struct bin_attribute *bin_attr, char *buf,
+                            loff_t off, size_t count)
+{
+       struct device *dev = container_of(kobj, struct device, kobj);
+       return w1_ds2781_io(dev, buf, off, count, 0);
+}
+
+static BIN_ATTR_RO(w1_slave, DS2781_DATA_SIZE);
+
+static struct bin_attribute *w1_ds2781_bin_attrs[] = {
+       &bin_attr_w1_slave,
+       NULL,
+};
+
+static const struct attribute_group w1_ds2781_group = {
+       .bin_attrs = w1_ds2781_bin_attrs,
+};
+
+static const struct attribute_group *w1_ds2781_groups[] = {
+       &w1_ds2781_group,
+       NULL,
+};
+
+static DEFINE_IDA(bat_ida);
+
+static int w1_ds2781_add_slave(struct w1_slave *sl)
+{
+       int ret;
+       int id;
+       struct platform_device *pdev;
+
+       id = ida_simple_get(&bat_ida, 0, 0, GFP_KERNEL);
+       if (id < 0) {
+               ret = id;
+               goto noid;
+       }
+
+       pdev = platform_device_alloc("ds2781-battery", id);
+       if (!pdev) {
+               ret = -ENOMEM;
+               goto pdev_alloc_failed;
+       }
+       pdev->dev.parent = &sl->dev;
+
+       ret = platform_device_add(pdev);
+       if (ret)
+               goto pdev_add_failed;
+
+       dev_set_drvdata(&sl->dev, pdev);
+
+       return 0;
+
+pdev_add_failed:
+       platform_device_put(pdev);
+pdev_alloc_failed:
+       ida_simple_remove(&bat_ida, id);
+noid:
+       return ret;
+}
+
+static void w1_ds2781_remove_slave(struct w1_slave *sl)
+{
+       struct platform_device *pdev = dev_get_drvdata(&sl->dev);
+       int id = pdev->id;
+
+       platform_device_unregister(pdev);
+       ida_simple_remove(&bat_ida, id);
+}
+
+static struct w1_family_ops w1_ds2781_fops = {
+       .add_slave    = w1_ds2781_add_slave,
+       .remove_slave = w1_ds2781_remove_slave,
+       .groups       = w1_ds2781_groups,
+};
+
+static struct w1_family w1_ds2781_family = {
+       .fid = W1_FAMILY_DS2781,
+       .fops = &w1_ds2781_fops,
+};
+
+static int __init w1_ds2781_init(void)
+{
+       ida_init(&bat_ida);
+       return w1_register_family(&w1_ds2781_family);
+}
+
+static void __exit w1_ds2781_exit(void)
+{
+       w1_unregister_family(&w1_ds2781_family);
+       ida_destroy(&bat_ida);
+}
+
+module_init(w1_ds2781_init);
+module_exit(w1_ds2781_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
+MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC");
+MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2781));