Merge branch 'master' into tk71

[mv-sheeva.git] / drivers / staging / iio / addac / adt7316-i2c.c

diff --git a/drivers/staging/iio/addac/adt7316-i2c.c b/drivers/staging/iio/addac/adt7316-i2c.c
new file mode 100644 (file)
index 0000000..52d1ea3
--- /dev/null
+++ b/drivers/staging/iio/addac/adt7316-i2c.c
@@ -0,0 +1,170 @@
+/*
+ * I2C bus driver for ADT7316/7/8 ADT7516/7/9 digital temperature
+ * sensor, ADC and DAC
+ *
+ * Copyright 2010 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+
+#include "adt7316.h"
+
+/*
+ * adt7316 register access by I2C
+ */
+static int adt7316_i2c_read(void *client, u8 reg, u8 *data)
+{
+       struct i2c_client *cl = client;
+       int ret = 0;
+
+       ret = i2c_smbus_write_byte(cl, reg);
+       if (ret < 0) {
+               dev_err(&cl->dev, "I2C fail to select reg\n");
+               return ret;
+       }
+
+       ret = i2c_smbus_read_byte(client);
+       if (ret < 0) {
+               dev_err(&cl->dev, "I2C read error\n");
+               return ret;
+       }
+
+       return 0;
+}
+
+static int adt7316_i2c_write(void *client, u8 reg, u8 data)
+{
+       struct i2c_client *cl = client;
+       int ret = 0;
+
+       ret = i2c_smbus_write_byte_data(cl, reg, data);
+       if (ret < 0)
+               dev_err(&cl->dev, "I2C write error\n");
+
+       return ret;
+}
+
+static int adt7316_i2c_multi_read(void *client, u8 reg, u8 count, u8 *data)
+{
+       struct i2c_client *cl = client;
+       int i, ret = 0;
+
+       if (count > ADT7316_REG_MAX_ADDR)
+               count = ADT7316_REG_MAX_ADDR;
+
+       for (i = 0; i < count; i++) {
+               ret = adt7316_i2c_read(cl, reg, &data[i]);
+               if (ret < 0) {
+                       dev_err(&cl->dev, "I2C multi read error\n");
+                       return ret;
+               }
+       }
+
+       return 0;
+}
+
+static int adt7316_i2c_multi_write(void *client, u8 reg, u8 count, u8 *data)
+{
+       struct i2c_client *cl = client;
+       int i, ret = 0;
+
+       if (count > ADT7316_REG_MAX_ADDR)
+               count = ADT7316_REG_MAX_ADDR;
+
+       for (i = 0; i < count; i++) {
+               ret = adt7316_i2c_write(cl, reg, data[i]);
+               if (ret < 0) {
+                       dev_err(&cl->dev, "I2C multi write error\n");
+                       return ret;
+               }
+       }
+
+       return 0;
+}
+
+/*
+ * device probe and remove
+ */
+
+static int __devinit adt7316_i2c_probe(struct i2c_client *client,
+               const struct i2c_device_id *id)
+{
+       struct adt7316_bus bus = {
+               .client = client,
+               .irq = client->irq,
+               .irq_flags = IRQF_TRIGGER_LOW,
+               .read = adt7316_i2c_read,
+               .write = adt7316_i2c_write,
+               .multi_read = adt7316_i2c_multi_read,
+               .multi_write = adt7316_i2c_multi_write,
+       };
+
+       return adt7316_probe(&client->dev, &bus, id->name);
+}
+
+static int __devexit adt7316_i2c_remove(struct i2c_client *client)
+{
+       return adt7316_remove(&client->dev);;
+}
+
+static const struct i2c_device_id adt7316_i2c_id[] = {
+       { "adt7316", 0 },
+       { "adt7317", 0 },
+       { "adt7318", 0 },
+       { "adt7516", 0 },
+       { "adt7517", 0 },
+       { "adt7519", 0 },
+       { }
+};
+
+MODULE_DEVICE_TABLE(i2c, adt7316_i2c_id);
+
+#ifdef CONFIG_PM
+static int adt7316_i2c_suspend(struct i2c_client *client, pm_message_t message)
+{
+       return adt7316_disable(&client->dev);
+}
+
+static int adt7316_i2c_resume(struct i2c_client *client)
+{
+       return adt7316_enable(&client->dev);
+}
+#else
+# define adt7316_i2c_suspend NULL
+# define adt7316_i2c_resume  NULL
+#endif
+
+static struct i2c_driver adt7316_driver = {
+       .driver = {
+               .name = "adt7316",
+               .owner  = THIS_MODULE,
+       },
+       .probe = adt7316_i2c_probe,
+       .remove = __devexit_p(adt7316_i2c_remove),
+       .suspend = adt7316_i2c_suspend,
+       .resume = adt7316_i2c_resume,
+       .id_table = adt7316_i2c_id,
+};
+
+static __init int adt7316_i2c_init(void)
+{
+       return i2c_add_driver(&adt7316_driver);
+}
+
+static __exit void adt7316_i2c_exit(void)
+{
+       i2c_del_driver(&adt7316_driver);
+}
+
+MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
+MODULE_DESCRIPTION("I2C bus driver for Analog Devices ADT7316/7/9 and"
+                       "ADT7516/7/8 digital temperature sensor, ADC and DAC");
+MODULE_LICENSE("GPL v2");
+
+module_init(adt7316_i2c_init);
+module_exit(adt7316_i2c_exit);