1 files changed, 236 insertions, 0 deletions

diff --git a/drivers/mfd/88pm860x-i2c.c b/drivers/mfd/88pm860x-i2c.c
new file mode 100644
index 000000000000..c37e12bf3004
--- /dev/null
+++ b/drivers/mfd/88pm860x-i2c.c
@@ -0,0 +1,236 @@
+/*
+ * I2C driver for Marvell 88PM860x
+ *
+ * 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/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/mfd/88pm860x.h>
+
+static inline int pm860x_read_device(struct i2c_client *i2c,
+                                     int reg, int bytes, void *dest)
+{
+        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 pm860x_write_device(struct i2c_client *i2c,
+                                      int reg, int bytes, void *src)
+{
+        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 pm860x_reg_read(struct i2c_client *i2c, int reg)
+{
+        struct pm860x_chip *chip = i2c_get_clientdata(i2c);
+        unsigned char data;
+        int ret;
+
+        mutex_lock(&chip->io_lock);
+        ret = pm860x_read_device(i2c, reg, 1, &data);
+        mutex_unlock(&chip->io_lock);
+
+        if (ret < 0)
+                return ret;
+        else
+                return (int)data;
+}
+EXPORT_SYMBOL(pm860x_reg_read);
+
+int pm860x_reg_write(struct i2c_client *i2c, int reg,
+                     unsigned char data)
+{
+        struct pm860x_chip *chip = i2c_get_clientdata(i2c);
+        int ret;
+
+        mutex_lock(&chip->io_lock);
+        ret = pm860x_write_device(i2c, reg, 1, &data);
+        mutex_unlock(&chip->io_lock);
+
+        return ret;
+}
+EXPORT_SYMBOL(pm860x_reg_write);
+
+int pm860x_bulk_read(struct i2c_client *i2c, int reg,
+                     int count, unsigned char *buf)
+{
+        struct pm860x_chip *chip = i2c_get_clientdata(i2c);
+        int ret;
+
+        mutex_lock(&chip->io_lock);
+        ret = pm860x_read_device(i2c, reg, count, buf);
+        mutex_unlock(&chip->io_lock);
+
+        return ret;
+}
+EXPORT_SYMBOL(pm860x_bulk_read);
+
+int pm860x_bulk_write(struct i2c_client *i2c, int reg,
+                      int count, unsigned char *buf)
+{
+        struct pm860x_chip *chip = i2c_get_clientdata(i2c);
+        int ret;
+
+        mutex_lock(&chip->io_lock);
+        ret = pm860x_write_device(i2c, reg, count, buf);
+        mutex_unlock(&chip->io_lock);
+
+        return ret;
+}
+EXPORT_SYMBOL(pm860x_bulk_write);
+
+int pm860x_set_bits(struct i2c_client *i2c, int reg,
+                    unsigned char mask, unsigned char data)
+{
+        struct pm860x_chip *chip = i2c_get_clientdata(i2c);
+        unsigned char value;
+        int ret;
+
+        mutex_lock(&chip->io_lock);
+        ret = pm860x_read_device(i2c, reg, 1, &value);
+        if (ret < 0)
+                goto out;
+        value &= ~mask;
+        value |= data;
+        ret = pm860x_write_device(i2c, reg, 1, &value);
+out:
+        mutex_unlock(&chip->io_lock);
+        return ret;
+}
+EXPORT_SYMBOL(pm860x_set_bits);
+
+
+static const struct i2c_device_id pm860x_id_table[] = {
+        { "88PM860x", 0 },
+        {}
+};
+MODULE_DEVICE_TABLE(i2c, pm860x_id_table);
+
+static int verify_addr(struct i2c_client *i2c)
+{
+        unsigned short addr_8607[] = {0x30, 0x34};
+        unsigned short addr_8606[] = {0x10, 0x11};
+        int size, i;
+
+        if (i2c == NULL)
+                return 0;
+        size = ARRAY_SIZE(addr_8606);
+        for (i = 0; i < size; i++) {
+                if (i2c->addr == *(addr_8606 + i))
+                        return CHIP_PM8606;
+        }
+        size = ARRAY_SIZE(addr_8607);
+        for (i = 0; i < size; i++) {
+                if (i2c->addr == *(addr_8607 + i))
+                        return CHIP_PM8607;
+        }
+        return 0;
+}
+
+static int __devinit pm860x_probe(struct i2c_client *client,
+                                  const struct i2c_device_id *id)
+{
+        struct pm860x_platform_data *pdata = client->dev.platform_data;
+        struct pm860x_chip *chip;
+
+        if (!pdata) {
+                pr_info("No platform data in %s!\n", __func__);
+                return -EINVAL;
+        }
+
+        chip = kzalloc(sizeof(struct pm860x_chip), GFP_KERNEL);
+        if (chip == NULL)
+                return -ENOMEM;
+
+        chip->id = verify_addr(client);
+        chip->client = client;
+        i2c_set_clientdata(client, chip);
+        chip->dev = &client->dev;
+        mutex_init(&chip->io_lock);
+        dev_set_drvdata(chip->dev, chip);
+
+        /*
+         * Both client and companion client shares same platform driver.
+         * Driver distinguishes them by pdata->companion_addr.
+         * pdata->companion_addr is only assigned if companion chip exists.
+         * At the same time, the companion_addr shouldn't equal to client
+         * address.
+         */
+        if (pdata->companion_addr && (pdata->companion_addr != client->addr)) {
+                chip->companion_addr = pdata->companion_addr;
+                chip->companion = i2c_new_dummy(chip->client->adapter,
+                                                chip->companion_addr);
+                i2c_set_clientdata(chip->companion, chip);
+        }
+
+        pm860x_device_init(chip, pdata);
+        return 0;
+}
+
+static int __devexit pm860x_remove(struct i2c_client *client)
+{
+        struct pm860x_chip *chip = i2c_get_clientdata(client);
+
+        pm860x_device_exit(chip);
+        i2c_unregister_device(chip->companion);
+        i2c_set_clientdata(chip->companion, NULL);
+        i2c_set_clientdata(chip->client, NULL);
+        kfree(chip);
+        return 0;
+}
+
+static struct i2c_driver pm860x_driver = {
+        .driver = {
+                .name   = "88PM860x",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = pm860x_probe,
+        .remove         = __devexit_p(pm860x_remove),
+        .id_table       = pm860x_id_table,
+};
+
+static int __init pm860x_i2c_init(void)
+{
+        int ret;
+        ret = i2c_add_driver(&pm860x_driver);
+        if (ret != 0)
+                pr_err("Failed to register 88PM860x I2C driver: %d\n", ret);
+        return ret;
+}
+subsys_initcall(pm860x_i2c_init);
+
+static void __exit pm860x_i2c_exit(void)
+{
+        i2c_del_driver(&pm860x_driver);
+}
+module_exit(pm860x_i2c_exit);
+
+MODULE_DESCRIPTION("I2C Driver for Marvell 88PM860x");
+MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
+MODULE_LICENSE("GPL");