Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / mfd / 88pm860x-i2c.c

diff --git a/kernel/drivers/mfd/88pm860x-i2c.c b/kernel/drivers/mfd/88pm860x-i2c.c
new file mode 100644 (file)
index 0000000..84e3131
--- /dev/null
+++ b/kernel/drivers/mfd/88pm860x-i2c.c
@@ -0,0 +1,177 @@
+/*
+ * I2C driver for Marvell 88PM860x
+ *
+ * Copyright (C) 2009 Marvell International Ltd.
+ *
+ * Author: 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/i2c.h>
+#include <linux/regmap.h>
+#include <linux/mfd/88pm860x.h>
+
+int pm860x_reg_read(struct i2c_client *i2c, int reg)
+{
+       struct pm860x_chip *chip = i2c_get_clientdata(i2c);
+       struct regmap *map = (i2c == chip->client) ? chip->regmap
+                               : chip->regmap_companion;
+       unsigned int data;
+       int ret;
+
+       ret = regmap_read(map, reg, &data);
+       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);
+       struct regmap *map = (i2c == chip->client) ? chip->regmap
+                               : chip->regmap_companion;
+       int ret;
+
+       ret = regmap_write(map, reg, data);
+       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);
+       struct regmap *map = (i2c == chip->client) ? chip->regmap
+                               : chip->regmap_companion;
+       int ret;
+
+       ret = regmap_raw_read(map, reg, buf, count);
+       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);
+       struct regmap *map = (i2c == chip->client) ? chip->regmap
+                               : chip->regmap_companion;
+       int ret;
+
+       ret = regmap_raw_write(map, reg, buf, count);
+       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);
+       struct regmap *map = (i2c == chip->client) ? chip->regmap
+                               : chip->regmap_companion;
+       int ret;
+
+       ret = regmap_update_bits(map, reg, mask, data);
+       return ret;
+}
+EXPORT_SYMBOL(pm860x_set_bits);
+
+static int read_device(struct i2c_client *i2c, int reg,
+                      int bytes, void *dest)
+{
+       unsigned char msgbuf0[I2C_SMBUS_BLOCK_MAX + 3];
+       unsigned char msgbuf1[I2C_SMBUS_BLOCK_MAX + 2];
+       struct i2c_adapter *adap = i2c->adapter;
+       struct i2c_msg msg[2] = {
+                                       {
+                                               .addr = i2c->addr,
+                                               .flags = 0,
+                                               .len = 1,
+                                               .buf = msgbuf0
+                                       },
+                                       {       .addr = i2c->addr,
+                                               .flags = I2C_M_RD,
+                                               .len = 0,
+                                               .buf = msgbuf1
+                                       },
+                               };
+       int num = 1, ret = 0;
+
+       if (dest == NULL)
+               return -EINVAL;
+       msgbuf0[0] = (unsigned char)reg;        /* command */
+       msg[1].len = bytes;
+
+       /* if data needs to read back, num should be 2 */
+       if (bytes > 0)
+               num = 2;
+       ret = adap->algo->master_xfer(adap, msg, num);
+       memcpy(dest, msgbuf1, bytes);
+       if (ret < 0)
+               return ret;
+       return 0;
+}
+
+static int write_device(struct i2c_client *i2c, int reg,
+                       int bytes, void *src)
+{
+       unsigned char buf[2];
+       struct i2c_adapter *adap = i2c->adapter;
+       struct i2c_msg msg;
+       int ret;
+
+       buf[0] = (unsigned char)reg;
+       memcpy(&buf[1], src, bytes);
+       msg.addr = i2c->addr;
+       msg.flags = 0;
+       msg.len = bytes + 1;
+       msg.buf = buf;
+
+       ret = adap->algo->master_xfer(adap, &msg, 1);
+       if (ret < 0)
+               return ret;
+       return 0;
+}
+
+int pm860x_page_reg_write(struct i2c_client *i2c, int reg,
+                         unsigned char data)
+{
+       unsigned char zero;
+       int ret;
+
+       i2c_lock_adapter(i2c->adapter);
+       read_device(i2c, 0xFA, 0, &zero);
+       read_device(i2c, 0xFB, 0, &zero);
+       read_device(i2c, 0xFF, 0, &zero);
+       ret = write_device(i2c, reg, 1, &data);
+       read_device(i2c, 0xFE, 0, &zero);
+       read_device(i2c, 0xFC, 0, &zero);
+       i2c_unlock_adapter(i2c->adapter);
+       return ret;
+}
+EXPORT_SYMBOL(pm860x_page_reg_write);
+
+int pm860x_page_bulk_read(struct i2c_client *i2c, int reg,
+                         int count, unsigned char *buf)
+{
+       unsigned char zero = 0;
+       int ret;
+
+       i2c_lock_adapter(i2c->adapter);
+       read_device(i2c, 0xfa, 0, &zero);
+       read_device(i2c, 0xfb, 0, &zero);
+       read_device(i2c, 0xff, 0, &zero);
+       ret = read_device(i2c, reg, count, buf);
+       read_device(i2c, 0xFE, 0, &zero);
+       read_device(i2c, 0xFC, 0, &zero);
+       i2c_unlock_adapter(i2c->adapter);
+       return ret;
+}
+EXPORT_SYMBOL(pm860x_page_bulk_read);