[PATCH 2/5] HDQ: BQ27000 HDQ Slave Interface Driver

Gadiyar, Anand
2008-10-08T07:23:20Z

From: Madhusudhan Chikkature <madhu.cr@ti.com>

This patch provides the BQ27000 slave interface driver.

Signed-off-by: Madhusudhan Chikkature <madhu.cr@ti.com>
Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
---
drivers/w1/slaves/Kconfig | 7 ++
drivers/w1/slaves/Makefile | 2
drivers/w1/slaves/w1_bq27000.c | 120 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 128 insertions(+), 1 deletion(-)

Index: linux-2.6/drivers/w1/slaves/Kconfig
===================================================================
--- linux-2.6.orig/drivers/w1/slaves/Kconfig 2008-09-19 13:39:41.000000000 +0530
+++ linux-2.6/drivers/w1/slaves/Kconfig 2008-09-26 14:45:04.000000000 +0530
@@ -44,4 +44,11 @@ config W1_SLAVE_DS2760

If you are unsure, say N.

+config W1_SLAVE_BQ27000
+ tristate "BQ27000 slave support"
+ depends on W1
+ help
+ Say Y here if you want to use a hdq
+ bq27000 slave support.
+
endmenu
Index: linux-2.6/drivers/w1/slaves/Makefile
===================================================================
--- linux-2.6.orig/drivers/w1/slaves/Makefile 2008-09-19 13:39:41.000000000 +0530
+++ linux-2.6/drivers/w1/slaves/Makefile 2008-09-26 14:45:43.000000000 +0530
@@ -6,4 +6,4 @@ obj-$(CONFIG_W1_SLAVE_THERM) += w1_therm
obj-$(CONFIG_W1_SLAVE_SMEM) += w1_smem.o
obj-$(CONFIG_W1_SLAVE_DS2433) += w1_ds2433.o
obj-$(CONFIG_W1_SLAVE_DS2760) += w1_ds2760.o
-
+obj-$(CONFIG_W1_SLAVE_BQ27000) += w1_bq27000.o
Index: linux-2.6/drivers/w1/slaves/w1_bq27000.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6/drivers/w1/slaves/w1_bq27000.c 2008-09-26 14:43:42.000000000 +0530
@@ -0,0 +1,120 @@
+/*
+ * drivers/w1/slaves/w1_bq27000.c
+ *
+ * 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 "../w1.h"
+#include "../w1_int.h"
+#include "../w1_family.h"
+
+#define HDQ_CMD_READ (0)
+#define HDQ_CMD_WRITE (1<<7)
+
+int F_ID;
+int family_id;
+
+void w1_bq27000_write(struct device *dev, u8 buf, u8 reg)
+{
+ struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+ if (!dev) {
+ pr_info("Could not obtain slave dev ptr\n");
+ return;
+ }
+
+ w1_write_8(sl->master, HDQ_CMD_WRITE | reg);
+ w1_write_8(sl->master, buf);
+}
+EXPORT_SYMBOL(w1_bq27000_write);
+
+int w1_bq27000_read(struct device *dev, u8 reg)
+{
+ u8 val;
+ struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+ if (!dev)
+ return 0;
+
+ w1_write_8(sl->master, HDQ_CMD_READ | reg);
+ val = w1_read_8(sl->master);
+
+ return val;
+}
+EXPORT_SYMBOL(w1_bq27000_read);
+
+static int w1_bq27000_add_slave(struct w1_slave *sl)
+{
+ int ret;
+ int id = 1;
+ struct platform_device *pdev;
+
+ pdev = platform_device_alloc("bq27000-battery", id);
+ if (!pdev) {
+ ret = -ENOMEM;
+ return ret;
+ }
+ 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_unregister(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 = 1,
+ .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_param(F_ID, int, S_IRUSR);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Texas Instruments Ltd");
+MODULE_DESCRIPTION("HDQ/1-wire slave driver bq27000 battery monitor chip");