mfd: Add 88PM8607 driver

This adds a core driver for 88PM8607 found in Marvell DKB development
platform. This driver is a proxy for all accesses to 88PM8607
sub-drivers which will be merged on top of this one, RTC, regulators,
battery and so on.

This chip is manufactured by Marvell.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

3 files changed, 313 insertions, 0 deletions

diff --git a/drivers/mfd/88pm8607.c b/drivers/mfd/88pm8607.c
new file mode 100644
index 000000000000..7e3f65907993
--- /dev/null
+++ b/drivers/mfd/88pm8607.c
@@ -0,0 +1,302 @@
+/*
+ * Base driver for Marvell 88PM8607
+ *
+ * Copyright (C) 2009 Marvell International Ltd.
+ *      Haojian Zhuang <haojian.zhuang@marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/88pm8607.h>
+
+
+#define PM8607_REG_RESOURCE(_start, _end)               \
+{                                                       \
+        .start  = PM8607_##_start,                      \
+        .end    = PM8607_##_end,                        \
+        .flags  = IORESOURCE_IO,                        \
+}
+
+static struct resource pm8607_regulator_resources[] = {
+        PM8607_REG_RESOURCE(BUCK1, BUCK1),
+        PM8607_REG_RESOURCE(BUCK2, BUCK2),
+        PM8607_REG_RESOURCE(BUCK3, BUCK3),
+        PM8607_REG_RESOURCE(LDO1,  LDO1),
+        PM8607_REG_RESOURCE(LDO2,  LDO2),
+        PM8607_REG_RESOURCE(LDO3,  LDO3),
+        PM8607_REG_RESOURCE(LDO4,  LDO4),
+        PM8607_REG_RESOURCE(LDO5,  LDO5),
+        PM8607_REG_RESOURCE(LDO6,  LDO6),
+        PM8607_REG_RESOURCE(LDO7,  LDO7),
+        PM8607_REG_RESOURCE(LDO8,  LDO8),
+        PM8607_REG_RESOURCE(LDO9,  LDO9),
+        PM8607_REG_RESOURCE(LDO10, LDO10),
+        PM8607_REG_RESOURCE(LDO12, LDO12),
+        PM8607_REG_RESOURCE(LDO14, LDO14),
+};
+
+#define PM8607_REG_DEVS(_name, _id)                                     \
+{                                                                       \
+        .name           = "88pm8607-" #_name,                           \
+        .num_resources  = 1,                                            \
+        .resources      = &pm8607_regulator_resources[PM8607_ID_##_id], \
+}
+
+static struct mfd_cell pm8607_devs[] = {
+        PM8607_REG_DEVS(buck1, BUCK1),
+        PM8607_REG_DEVS(buck2, BUCK2),
+        PM8607_REG_DEVS(buck3, BUCK3),
+        PM8607_REG_DEVS(ldo1,  LDO1),
+        PM8607_REG_DEVS(ldo2,  LDO2),
+        PM8607_REG_DEVS(ldo3,  LDO3),
+        PM8607_REG_DEVS(ldo4,  LDO4),
+        PM8607_REG_DEVS(ldo5,  LDO5),
+        PM8607_REG_DEVS(ldo6,  LDO6),
+        PM8607_REG_DEVS(ldo7,  LDO7),
+        PM8607_REG_DEVS(ldo8,  LDO8),
+        PM8607_REG_DEVS(ldo9,  LDO9),
+        PM8607_REG_DEVS(ldo10, LDO10),
+        PM8607_REG_DEVS(ldo12, LDO12),
+        PM8607_REG_DEVS(ldo14, LDO14),
+};
+
+static inline int pm8607_read_device(struct pm8607_chip *chip,
+                                     int reg, int bytes, void *dest)
+{
+        struct i2c_client *i2c = chip->client;
+        unsigned char data;
+        int ret;
+
+        data = (unsigned char)reg;
+        ret = i2c_master_send(i2c, &data, 1);
+        if (ret < 0)
+                return ret;
+
+        ret = i2c_master_recv(i2c, dest, bytes);
+        if (ret < 0)
+                return ret;
+        return 0;
+}
+
+static inline int pm8607_write_device(struct pm8607_chip *chip,
+                                      int reg, int bytes, void *src)
+{
+        struct i2c_client *i2c = chip->client;
+        unsigned char buf[bytes + 1];
+        int ret;
+
+        buf[0] = (unsigned char)reg;
+        memcpy(&buf[1], src, bytes);
+
+        ret = i2c_master_send(i2c, buf, bytes + 1);
+        if (ret < 0)
+                return ret;
+        return 0;
+}
+
+int pm8607_reg_read(struct pm8607_chip *chip, int reg)
+{
+        unsigned char data;
+        int ret;
+
+        mutex_lock(&chip->io_lock);
+        ret = chip->read(chip, reg, 1, &data);
+        mutex_unlock(&chip->io_lock);
+
+        if (ret < 0)
+                return ret;
+        else
+                return (int)data;
+}
+EXPORT_SYMBOL(pm8607_reg_read);
+
+int pm8607_reg_write(struct pm8607_chip *chip, int reg,
+                     unsigned char data)
+{
+        int ret;
+
+        mutex_lock(&chip->io_lock);
+        ret = chip->write(chip, reg, 1, &data);
+        mutex_unlock(&chip->io_lock);
+
+        return ret;
+}
+EXPORT_SYMBOL(pm8607_reg_write);
+
+int pm8607_bulk_read(struct pm8607_chip *chip, int reg,
+                     int count, unsigned char *buf)
+{
+        int ret;
+
+        mutex_lock(&chip->io_lock);
+        ret = chip->read(chip, reg, count, buf);
+        mutex_unlock(&chip->io_lock);
+
+        return ret;
+}
+EXPORT_SYMBOL(pm8607_bulk_read);
+
+int pm8607_bulk_write(struct pm8607_chip *chip, int reg,
+                      int count, unsigned char *buf)
+{
+        int ret;
+
+        mutex_lock(&chip->io_lock);
+        ret = chip->write(chip, reg, count, buf);
+        mutex_unlock(&chip->io_lock);
+
+        return ret;
+}
+EXPORT_SYMBOL(pm8607_bulk_write);
+
+int pm8607_set_bits(struct pm8607_chip *chip, int reg,
+                    unsigned char mask, unsigned char data)
+{
+        unsigned char value;
+        int ret;
+
+        mutex_lock(&chip->io_lock);
+        ret = chip->read(chip, reg, 1, &value);
+        if (ret < 0)
+                goto out;
+        value &= ~mask;
+        value |= data;
+        ret = chip->write(chip, reg, 1, &value);
+out:
+        mutex_unlock(&chip->io_lock);
+        return ret;
+}
+EXPORT_SYMBOL(pm8607_set_bits);
+
+
+static const struct i2c_device_id pm8607_id_table[] = {
+        { "88PM8607", 0 },
+        {}
+};
+MODULE_DEVICE_TABLE(i2c, pm8607_id_table);
+
+
+static int __devinit pm8607_probe(struct i2c_client *client,
+                                  const struct i2c_device_id *id)
+{
+        struct pm8607_platform_data *pdata = client->dev.platform_data;
+        struct pm8607_chip *chip;
+        int i, count;
+        int ret;
+
+        chip = kzalloc(sizeof(struct pm8607_chip), GFP_KERNEL);
+        if (chip == NULL)
+                return -ENOMEM;
+
+        chip->client = client;
+        chip->dev = &client->dev;
+        chip->read = pm8607_read_device;
+        chip->write = pm8607_write_device;
+        i2c_set_clientdata(client, chip);
+
+        mutex_init(&chip->io_lock);
+        dev_set_drvdata(chip->dev, chip);
+
+        ret = pm8607_reg_read(chip, PM8607_CHIP_ID);
+        if (ret < 0) {
+                dev_err(chip->dev, "Failed to read CHIP ID: %d\n", ret);
+                goto out;
+        }
+        if ((ret & CHIP_ID_MASK) == CHIP_ID)
+                dev_info(chip->dev, "Marvell 88PM8607 (ID: %02x) detected\n",
+                         ret);
+        else {
+                dev_err(chip->dev, "Failed to detect Marvell 88PM8607. "
+                        "Chip ID: %02x\n", ret);
+                goto out;
+        }
+        chip->chip_id = ret;
+
+        ret = pm8607_reg_read(chip, PM8607_BUCK3);
+        if (ret < 0) {
+                dev_err(chip->dev, "Failed to read BUCK3 register: %d\n", ret);
+                goto out;
+        }
+        if (ret & PM8607_BUCK3_DOUBLE)
+                chip->buck3_double = 1;
+
+        ret = pm8607_reg_read(chip, PM8607_MISC1);
+        if (ret < 0) {
+                dev_err(chip->dev, "Failed to read MISC1 register: %d\n", ret);
+                goto out;
+        }
+        if (pdata->i2c_port == PI2C_PORT)
+                ret |= PM8607_MISC1_PI2C;
+        else
+                ret &= ~PM8607_MISC1_PI2C;
+        ret = pm8607_reg_write(chip, PM8607_MISC1, ret);
+        if (ret < 0) {
+                dev_err(chip->dev, "Failed to write MISC1 register: %d\n", ret);
+                goto out;
+        }
+
+
+        count = ARRAY_SIZE(pm8607_devs);
+        for (i = 0; i < count; i++) {
+                ret = mfd_add_devices(chip->dev, i, &pm8607_devs[i],
+                                      1, NULL, 0);
+                if (ret != 0) {
+                        dev_err(chip->dev, "Failed to add subdevs\n");
+                        goto out;
+                }
+        }
+
+        return 0;
+
+out:
+        i2c_set_clientdata(client, NULL);
+        kfree(chip);
+        return ret;
+}
+
+static int __devexit pm8607_remove(struct i2c_client *client)
+{
+        struct pm8607_chip *chip = i2c_get_clientdata(client);
+
+        mfd_remove_devices(chip->dev);
+        kfree(chip);
+        return 0;
+}
+
+static struct i2c_driver pm8607_driver = {
+        .driver = {
+                .name   = "88PM8607",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = pm8607_probe,
+        .remove         = __devexit_p(pm8607_remove),
+        .id_table       = pm8607_id_table,
+};
+
+static int __init pm8607_init(void)
+{
+        int ret;
+        ret = i2c_add_driver(&pm8607_driver);
+        if (ret != 0)
+                pr_err("Failed to register 88PM8607 I2C driver: %d\n", ret);
+        return ret;
+}
+subsys_initcall(pm8607_init);
+
+static void __exit pm8607_exit(void)
+{
+        i2c_del_driver(&pm8607_driver);
+}
+module_exit(pm8607_exit);
+
+MODULE_DESCRIPTION("PMIC Driver for Marvell 88PM8607");
+MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index a296e717e86e..26a36f887357 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -319,6 +319,16 @@ config EZX_PCAP
           This enables the PCAP ASIC present on EZX Phones. This is
           needed for MMC, TouchScreen, Sound, USB, etc..
 
+config MFD_88PM8607
+        bool "Support Marvell 88PM8607"
+        depends on I2C
+        select MFD_CORE
+        help
+          This supports for Marvell 88PM8607 Power Management IC. This includes
+          the I2C driver and the core APIs _only_, you have to select
+          individual components like voltage regulators, RTC and
+          battery-charger under the corresponding menus.
+
 endmenu
 
 menu "Multimedia Capabilities Port drivers"
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 11350c1d9301..2596add427a2 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -52,3 +52,4 @@ obj-$(CONFIG_PCF50633_ADC)	+= pcf50633-adc.o
 obj-$(CONFIG_PCF50633_GPIO)     += pcf50633-gpio.o
 obj-$(CONFIG_AB3100_CORE)       += ab3100-core.o
 obj-$(CONFIG_AB3100_OTP)        += ab3100-otp.o
+obj-$(CONFIG_MFD_88PM8607)      += 88pm8607.o