mfd: Add new mfd device for TPS65217

The TPS65217 chip is a power management IC for Portable Navigation Systems
and Tablet Computing devices. It contains the following components:

- Regulators
- White LED
- USB battery charger

This patch adds support for tps65217 mfd device. At this time only
the regulator functionality is made available.

Signed-off-by: AnilKumar Ch <anilkumar@ti.com>
Reviwed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

3 files changed, 258 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index f147395bac9a..c559d352c420 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -143,6 +143,21 @@ config TPS6507X
           This driver can also be built as a module.  If so, the module
           will be called tps6507x.
 
+config MFD_TPS65217
+        tristate "TPS65217 Power Management / White LED chips"
+        depends on I2C
+        select MFD_CORE
+        select REGMAP_I2C
+        help
+          If you say yes here you get support for the TPS65217 series of
+          Power Management / White LED chips.
+          These include voltage regulators, lithium ion/polymer battery
+          charger, wled and other features that are often used in portable
+          devices.
+
+          This driver can also be built as a module.  If so, the module
+          will be called tps65217.
+
 config MFD_TPS6586X
         bool "TPS6586x Power Management chips"
         depends on I2C=y && GPIOLIB && GENERIC_HARDIRQS
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index b953bab934f7..27430d3e839c 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_MFD_WM8994)	+= wm8994-core.o wm8994-irq.o wm8994-regmap.o
 obj-$(CONFIG_TPS6105X)          += tps6105x.o
 obj-$(CONFIG_TPS65010)          += tps65010.o
 obj-$(CONFIG_TPS6507X)          += tps6507x.o
+obj-$(CONFIG_MFD_TPS65217)      += tps65217.o
 obj-$(CONFIG_MFD_TPS65910)      += tps65910.o tps65910-irq.o
 tps65912-objs                   := tps65912-core.o tps65912-irq.o
 obj-$(CONFIG_MFD_TPS65912)      += tps65912.o
diff --git a/drivers/mfd/tps65217.c b/drivers/mfd/tps65217.c
new file mode 100644
index 000000000000..f7d854e4cc62
--- /dev/null
+++ b/drivers/mfd/tps65217.c
@@ -0,0 +1,242 @@
+/*
+ * tps65217.c
+ *
+ * TPS65217 chip family multi-function driver
+ *
+ * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * 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 version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/regmap.h>
+#include <linux/err.h>
+
+#include <linux/mfd/core.h>
+#include <linux/mfd/tps65217.h>
+
+/**
+ * tps65217_reg_read: Read a single tps65217 register.
+ *
+ * @tps: Device to read from.
+ * @reg: Register to read.
+ * @val: Contians the value
+ */
+int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
+                        unsigned int *val)
+{
+        return regmap_read(tps->regmap, reg, val);
+}
+EXPORT_SYMBOL_GPL(tps65217_reg_read);
+
+/**
+ * tps65217_reg_write: Write a single tps65217 register.
+ *
+ * @tps65217: Device to write to.
+ * @reg: Register to write to.
+ * @val: Value to write.
+ * @level: Password protected level
+ */
+int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
+                        unsigned int val, unsigned int level)
+{
+        int ret;
+        unsigned int xor_reg_val;
+
+        switch (level) {
+        case TPS65217_PROTECT_NONE:
+                return regmap_write(tps->regmap, reg, val);
+        case TPS65217_PROTECT_L1:
+                xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
+                ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
+                                                        xor_reg_val);
+                if (ret < 0)
+                        return ret;
+
+                return regmap_write(tps->regmap, reg, val);
+        case TPS65217_PROTECT_L2:
+                xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
+                ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
+                                                        xor_reg_val);
+                if (ret < 0)
+                        return ret;
+                ret = regmap_write(tps->regmap, reg, val);
+                if (ret < 0)
+                        return ret;
+                ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
+                                                        xor_reg_val);
+                if (ret < 0)
+                        return ret;
+                return regmap_write(tps->regmap, reg, val);
+        default:
+                return -EINVAL;
+        }
+}
+EXPORT_SYMBOL_GPL(tps65217_reg_write);
+
+/**
+ * tps65217_update_bits: Modify bits w.r.t mask, val and level.
+ *
+ * @tps65217: Device to write to.
+ * @reg: Register to read-write to.
+ * @mask: Mask.
+ * @val: Value to write.
+ * @level: Password protected level
+ */
+int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
+                unsigned int mask, unsigned int val, unsigned int level)
+{
+        int ret;
+        unsigned int data;
+
+        ret = tps65217_reg_read(tps, reg, &data);
+        if (ret) {
+                dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
+                return ret;
+        }
+
+        data &= ~mask;
+        data |= val & mask;
+
+        ret = tps65217_reg_write(tps, reg, data, level);
+        if (ret)
+                dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
+
+        return ret;
+}
+
+int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
+                unsigned int mask, unsigned int val, unsigned int level)
+{
+        return tps65217_update_bits(tps, reg, mask, val, level);
+}
+EXPORT_SYMBOL_GPL(tps65217_set_bits);
+
+int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
+                unsigned int mask, unsigned int level)
+{
+        return tps65217_update_bits(tps, reg, mask, 0, level);
+}
+EXPORT_SYMBOL_GPL(tps65217_clear_bits);
+
+static struct regmap_config tps65217_regmap_config = {
+        .reg_bits = 8,
+        .val_bits = 8,
+};
+
+static int __devinit tps65217_probe(struct i2c_client *client,
+                                const struct i2c_device_id *ids)
+{
+        struct tps65217 *tps;
+        struct tps65217_board *pdata = client->dev.platform_data;
+        int i, ret;
+        unsigned int version;
+
+        tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
+        if (!tps)
+                return -ENOMEM;
+
+        tps->pdata = pdata;
+        tps->regmap = regmap_init_i2c(client, &tps65217_regmap_config);
+        if (IS_ERR(tps->regmap)) {
+                ret = PTR_ERR(tps->regmap);
+                dev_err(tps->dev, "Failed to allocate register map: %d\n",
+                        ret);
+                return ret;
+        }
+
+        i2c_set_clientdata(client, tps);
+        tps->dev = &client->dev;
+
+        ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
+        if (ret < 0) {
+                dev_err(tps->dev, "Failed to read revision"
+                                        " register: %d\n", ret);
+                goto err_regmap;
+        }
+
+        dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
+                        (version & TPS65217_CHIPID_CHIP_MASK) >> 4,
+                        version & TPS65217_CHIPID_REV_MASK);
+
+        for (i = 0; i < TPS65217_NUM_REGULATOR; i++) {
+                struct platform_device *pdev;
+
+                pdev = platform_device_alloc("tps65217-pmic", i);
+                if (!pdev) {
+                        dev_err(tps->dev, "Cannot create regulator %d\n", i);
+                        continue;
+                }
+
+                pdev->dev.parent = tps->dev;
+                platform_device_add_data(pdev, &pdata->tps65217_init_data[i],
+                                        sizeof(pdata->tps65217_init_data[i]));
+                tps->regulator_pdev[i] = pdev;
+
+                platform_device_add(pdev);
+        }
+
+        return 0;
+
+err_regmap:
+        regmap_exit(tps->regmap);
+
+        return ret;
+}
+
+static int __devexit tps65217_remove(struct i2c_client *client)
+{
+        struct tps65217 *tps = i2c_get_clientdata(client);
+        int i;
+
+        for (i = 0; i < TPS65217_NUM_REGULATOR; i++)
+                platform_device_unregister(tps->regulator_pdev[i]);
+
+        regmap_exit(tps->regmap);
+
+        return 0;
+}
+
+static const struct i2c_device_id tps65217_id_table[] = {
+        {"tps65217", 0xF0},
+        {/* end of list */}
+};
+MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
+
+static struct i2c_driver tps65217_driver = {
+        .driver         = {
+                .name   = "tps65217",
+        },
+        .id_table       = tps65217_id_table,
+        .probe          = tps65217_probe,
+        .remove         = __devexit_p(tps65217_remove),
+};
+
+static int __init tps65217_init(void)
+{
+        return i2c_add_driver(&tps65217_driver);
+}
+subsys_initcall(tps65217_init);
+
+static void __exit tps65217_exit(void)
+{
+        i2c_del_driver(&tps65217_driver);
+}
+module_exit(tps65217_exit);
+
+MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
+MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
+MODULE_LICENSE("GPL v2");