hdq: bQ27000 HDQ Slave Interface Driver

Provide the BQ27000 slave interface driver.

Signed-off-by: Madhusudhan Chikkature<madhu.cr@ti.com>
Acked-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/w1/slaves/Kconfig b/drivers/w1/slaves/Kconfig
index 3df29a1..8d0b1fb 100644 (file)
--- a/drivers/w1/slaves/Kconfig
+++ b/drivers/w1/slaves/Kconfig
@@ -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

diff --git a/drivers/w1/slaves/Makefile b/drivers/w1/slaves/Makefile
index a8eb752..990f400 100644 (file)
--- a/drivers/w1/slaves/Makefile
+++ b/drivers/w1/slaves/Makefile
@@ -6,4 +6,4 @@ obj-$(CONFIG_W1_SLAVE_THERM)    += w1_therm.o
 obj-$(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

diff --git a/drivers/w1/slaves/w1_bq27000.c b/drivers/w1/slaves/w1_bq27000.c
new file mode 100644 (file)
index 0000000..8f4c91f
--- /dev/null
+++ b/drivers/w1/slaves/w1_bq27000.c
@@ -0,0 +1,123 @@
+/*
+ * 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)
+
+static int F_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_PARM_DESC(F_ID, "1-wire slave FID for BQ device");
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Texas Instruments Ltd");
+MODULE_DESCRIPTION("HDQ/1-wire slave driver bq27000 battery monitor chip");