MFD: TPS65910: Add new mfd device for TPS65910
The TPS65910 chip is a power management IC for multimedia and handheld
devices. It contains the following components:
- Regulators
- GPIO controller
- RTC
The tps65910 core driver is registered as a platform driver and provides
communication through I2C with the host device for the different
components.
Signed-off-by: Graeme Gregory <gg@slimlogic.co.uk>
Signed-off-by: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c
new file mode 100644
index 0000000..dbcdfb5
--- /dev/null
+++ b/drivers/mfd/tps65910.c
@@ -0,0 +1,208 @@
+/*
+ * tps65910.c -- TI TPS6591x
+ *
+ * Copyright 2010 Texas Instruments Inc.
+ *
+ * Author: Graeme Gregory <gg@slimlogic.co.uk>
+ * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/tps65910.h>
+
+static struct mfd_cell tps65910s[] = {
+ {
+ .name = "tps65910-pmic",
+ },
+ {
+ .name = "tps65910-rtc",
+ },
+ {
+ .name = "tps65910-power",
+ },
+};
+
+
+static int tps65910_i2c_read(struct tps65910 *tps65910, u8 reg,
+ int bytes, void *dest)
+{
+ struct i2c_client *i2c = tps65910->i2c_client;
+ struct i2c_msg xfer[2];
+ int ret;
+
+ /* Write register */
+ xfer[0].addr = i2c->addr;
+ xfer[0].flags = 0;
+ xfer[0].len = 1;
+ xfer[0].buf = ®
+
+ /* Read data */
+ xfer[1].addr = i2c->addr;
+ xfer[1].flags = I2C_M_RD;
+ xfer[1].len = bytes;
+ xfer[1].buf = dest;
+
+ ret = i2c_transfer(i2c->adapter, xfer, 2);
+ if (ret == 2)
+ ret = 0;
+ else if (ret >= 0)
+ ret = -EIO;
+
+ return ret;
+}
+
+static int tps65910_i2c_write(struct tps65910 *tps65910, u8 reg,
+ int bytes, void *src)
+{
+ struct i2c_client *i2c = tps65910->i2c_client;
+ /* we add 1 byte for device register */
+ u8 msg[TPS65910_MAX_REGISTER + 1];
+ int ret;
+
+ if (bytes > (TPS65910_MAX_REGISTER + 1))
+ return -EINVAL;
+
+ msg[0] = reg;
+ memcpy(&msg[1], src, bytes);
+
+ ret = i2c_master_send(i2c, msg, bytes + 1);
+ if (ret < 0)
+ return ret;
+ if (ret != bytes + 1)
+ return -EIO;
+ return 0;
+}
+
+int tps65910_set_bits(struct tps65910 *tps65910, u8 reg, u8 mask)
+{
+ u8 data;
+ int err;
+
+ mutex_lock(&tps65910->io_mutex);
+ err = tps65910_i2c_read(tps65910, reg, 1, &data);
+ if (err) {
+ dev_err(tps65910->dev, "read from reg %x failed\n", reg);
+ goto out;
+ }
+
+ data |= mask;
+ err = tps65910_i2c_write(tps65910, reg, 1, &data);
+ if (err)
+ dev_err(tps65910->dev, "write to reg %x failed\n", reg);
+
+out:
+ mutex_unlock(&tps65910->io_mutex);
+ return err;
+}
+EXPORT_SYMBOL_GPL(tps65910_set_bits);
+
+int tps65910_clear_bits(struct tps65910 *tps65910, u8 reg, u8 mask)
+{
+ u8 data;
+ int err;
+
+ mutex_lock(&tps65910->io_mutex);
+ err = tps65910_i2c_read(tps65910, reg, 1, &data);
+ if (err) {
+ dev_err(tps65910->dev, "read from reg %x failed\n", reg);
+ goto out;
+ }
+
+ data &= mask;
+ err = tps65910_i2c_write(tps65910, reg, 1, &data);
+ if (err)
+ dev_err(tps65910->dev, "write to reg %x failed\n", reg);
+
+out:
+ mutex_unlock(&tps65910->io_mutex);
+ return err;
+}
+EXPORT_SYMBOL_GPL(tps65910_clear_bits);
+
+static int tps65910_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct tps65910 *tps65910;
+ int ret = 0;
+
+ tps65910 = kzalloc(sizeof(struct tps65910), GFP_KERNEL);
+ if (tps65910 == NULL)
+ return -ENOMEM;
+
+ i2c_set_clientdata(i2c, tps65910);
+ tps65910->dev = &i2c->dev;
+ tps65910->i2c_client = i2c;
+ tps65910->read = tps65910_i2c_read;
+ tps65910->write = tps65910_i2c_write;
+ mutex_init(&tps65910->io_mutex);
+
+ ret = mfd_add_devices(tps65910->dev, -1,
+ tps65910s, ARRAY_SIZE(tps65910s),
+ NULL, 0);
+ if (ret < 0)
+ goto err;
+
+ return ret;
+
+err:
+ mfd_remove_devices(tps65910->dev);
+ kfree(tps65910);
+ return ret;
+}
+
+static int tps65910_i2c_remove(struct i2c_client *i2c)
+{
+ struct tps65910 *tps65910 = i2c_get_clientdata(i2c);
+
+ mfd_remove_devices(tps65910->dev);
+ kfree(tps65910);
+
+ return 0;
+}
+
+static const struct i2c_device_id tps65910_i2c_id[] = {
+ { "tps65910", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tps65910_i2c_id);
+
+
+static struct i2c_driver tps65910_i2c_driver = {
+ .driver = {
+ .name = "tps65910",
+ .owner = THIS_MODULE,
+ },
+ .probe = tps65910_i2c_probe,
+ .remove = tps65910_i2c_remove,
+ .id_table = tps65910_i2c_id,
+};
+
+static int __init tps65910_i2c_init(void)
+{
+ return i2c_add_driver(&tps65910_i2c_driver);
+}
+/* init early so consumer devices can complete system boot */
+subsys_initcall(tps65910_i2c_init);
+
+static void __exit tps65910_i2c_exit(void)
+{
+ i2c_del_driver(&tps65910_i2c_driver);
+}
+module_exit(tps65910_i2c_exit);
+
+MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
+MODULE_AUTHOR("Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>");
+MODULE_DESCRIPTION("TPS6591x chip family multi-function driver");
+MODULE_LICENSE("GPL");