1 files changed, 115 insertions, 0 deletions
diff --git a/drivers/power/supply/bq27xxx_battery_hdq.c b/drivers/power/supply/bq27xxx_battery_hdq.c
new file mode 100644
index 000000000000..f4df67eb9d2c
--- /dev/null
+++ b/drivers/power/supply/bq27xxx_battery_hdq.c
@@ -0,0 +1,115 @@
+/*
+ * Copyright (C) 2007 Texas Instruments, Inc.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ *
+ */
+
+#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/power/bq27xxx_battery.h>
+
+#include <linux/w1.h>
+
+#define W1_FAMILY_BQ27000	0x01
+
+#define HDQ_CMD_READ	(0)
+#define HDQ_CMD_WRITE	(1<<7)
+
+static int F_ID;
+module_param(F_ID, int, S_IRUSR);
+MODULE_PARM_DESC(F_ID, "1-wire slave FID for BQ device");
+
+static int w1_bq27000_read(struct device *dev, unsigned int reg)
+{
+	u8 val;
+	struct w1_slave *sl = container_of(dev->parent, struct w1_slave, dev);
+
+	mutex_lock(&sl->master->bus_mutex);
+	w1_write_8(sl->master, HDQ_CMD_READ | reg);
+	val = w1_read_8(sl->master);
+	mutex_unlock(&sl->master->bus_mutex);
+
+	return val;
+}
+
+static struct bq27xxx_platform_data bq27000_battery_info = {
+	.read   = w1_bq27000_read,
+	.name   = "bq27000-battery",
+	.chip   = BQ27000,
+};
+
+static int w1_bq27000_add_slave(struct w1_slave *sl)
+{
+	int ret;
+	struct platform_device *pdev;
+
+	pdev = platform_device_alloc("bq27000-battery", -1);
+	if (!pdev) {
+		ret = -ENOMEM;
+		return ret;
+	}
+	ret = platform_device_add_data(pdev,
+				       &bq27000_battery_info,
+				       sizeof(bq27000_battery_info));
+	if (ret)
+		goto pdev_add_failed;
+	pdev->dev.parent = &sl->dev;
+
+	ret = platform_device_add(pdev);
+	if (ret)
+		goto pdev_add_failed;
+
+	dev_set_drvdata(&sl->dev, pdev);
+
+	goto success;
+
+pdev_add_failed:
+	platform_device_put(pdev);
+success:
+	return ret;
+}
+
+static void w1_bq27000_remove_slave(struct w1_slave *sl)
+{
+	struct platform_device *pdev = dev_get_drvdata(&sl->dev);
+
+	platform_device_unregister(pdev);
+}
+
+static struct w1_family_ops w1_bq27000_fops = {
+	.add_slave	= w1_bq27000_add_slave,
+	.remove_slave	= w1_bq27000_remove_slave,
+};
+
+static struct w1_family w1_bq27000_family = {
+	.fid = W1_FAMILY_BQ27000,
+	.fops = &w1_bq27000_fops,
+};
+
+static int __init w1_bq27000_init(void)
+{
+	if (F_ID)
+		w1_bq27000_family.fid = F_ID;
+
+	return w1_register_family(&w1_bq27000_family);
+}
+
+static void __exit w1_bq27000_exit(void)
+{
+	w1_unregister_family(&w1_bq27000_family);
+}
+
+module_init(w1_bq27000_init);
+module_exit(w1_bq27000_exit);
+
+MODULE_AUTHOR("Texas Instruments Ltd");
+MODULE_DESCRIPTION("HDQ/1-wire slave driver bq27000 battery monitor chip");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_BQ27000));