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author | Sascha Hauer <s.hauer@pengutronix.de> | 2010-10-10 19:36:19 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2010-10-11 13:22:13 +0200 |
commit | 2ebb440e1d92c60f47a0d89b7666f190caf38561 (patch) | |
tree | 3e361fe34257ce37463dec5b6d129bc52258fb7b /drivers/mfd/twl4030.c | |
parent | 8f14d065e1e39d88949ee489acfe6f7faa51f1b1 (diff) | |
download | barebox-2ebb440e1d92c60f47a0d89b7666f190caf38561.tar.gz barebox-2ebb440e1d92c60f47a0d89b7666f190caf38561.tar.xz |
Move mfd drivers to drivers/mfd
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/mfd/twl4030.c')
-rw-r--r-- | drivers/mfd/twl4030.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/drivers/mfd/twl4030.c b/drivers/mfd/twl4030.c new file mode 100644 index 0000000000..5305ec67e3 --- /dev/null +++ b/drivers/mfd/twl4030.c @@ -0,0 +1,186 @@ +/* + * Copyright (C) 2010 Michael Grzeschik <mgr@pengutronix.de> + * + * This file is released under the GPLv2 + * + */ + +#include <common.h> +#include <init.h> +#include <driver.h> +#include <xfuncs.h> +#include <errno.h> + +#include <i2c/i2c.h> +#include <i2c/twl4030.h> + +#define DRIVERNAME "twl4030" + +#define to_twl4030(a) container_of(a, struct twl4030, cdev) + +static struct twl4030 *twl_dev; + +struct twl4030 *twl4030_get(void) +{ + if (!twl_dev) + return NULL; + + return twl_dev; +} +EXPORT_SYMBOL(twl4030_get); + +int twl4030_reg_read(struct twl4030 *twl4030, u16 reg, u8 *val) +{ + int ret; + struct i2c_msg xfer_msg[2]; + struct i2c_msg *msg; + int i2c_addr; + unsigned char buf = reg & 0xff; + + i2c_addr = twl4030->client->addr + (reg / 0x100); + + /* [MSG1] fill the register address data */ + msg = &xfer_msg[0]; + msg->addr = i2c_addr; + msg->len = 1; + msg->flags = 0; /* Read the register value */ + msg->buf = &buf; + /* [MSG2] fill the data rx buffer */ + msg = &xfer_msg[1]; + msg->addr = i2c_addr; + msg->flags = I2C_M_RD; /* Read the register value */ + msg->len = 1; /* only n bytes */ + msg->buf = val; + ret = i2c_transfer(twl4030->client->adapter, xfer_msg, 2); + + /* i2c_transfer returns number of messages transferred */ + if (ret < 0) { + pr_err("%s: failed to transfer all messages: %s\n", __func__, strerror(-ret)); + return ret; + } + return 0; +} +EXPORT_SYMBOL(twl4030_reg_read) + +int twl4030_reg_write(struct twl4030 *twl4030, u16 reg, u8 val) +{ + int ret; + struct i2c_msg xfer_msg[1]; + struct i2c_msg *msg; + int i2c_addr; + u8 buf[2]; + + buf[0] = reg & 0xff; + buf[1] = val; + + i2c_addr = twl4030->client->addr + (reg / 0x100); + + /* + * [MSG1]: fill the register address data + * fill the data Tx buffer + */ + msg = xfer_msg; + msg->addr = i2c_addr; + msg->len = 2; + msg->flags = 0; + msg->buf = buf; + /* over write the first byte of buffer with the register address */ + ret = i2c_transfer(twl4030->client->adapter, xfer_msg, 1); + + /* i2c_transfer returns number of messages transferred */ + if (ret < 0) { + pr_err("%s: failed to transfer all messages: %s\n", __func__, strerror(-ret)); + return ret; + } + return 0; +} +EXPORT_SYMBOL(twl4030_reg_write) + +int twl4030_set_bits(struct twl4030 *twl4030, enum twl4030_reg reg, u8 mask, u8 val) +{ + u8 tmp; + int err; + + err = twl4030_reg_read(twl4030, reg, &tmp); + tmp = (tmp & ~mask) | val; + + if (!err) + err = twl4030_reg_write(twl4030, reg, tmp); + + return err; +} +EXPORT_SYMBOL(twl4030_set_bits); + +static ssize_t twl_read(struct cdev *cdev, void *_buf, size_t count, ulong offset, ulong flags) +{ + struct twl4030 *priv = to_twl4030(cdev); + u8 *buf = _buf; + size_t i = count; + int err; + + while (i) { + err = twl4030_reg_read(priv, offset, buf); + if (err) + return (ssize_t)err; + buf++; + i--; + offset++; + } + + return count; +} + +static ssize_t twl_write(struct cdev *cdev, const void *_buf, size_t count, ulong offset, ulong flags) +{ + struct twl4030 *twl4030 = to_twl4030(cdev); + const u8 *buf = _buf; + size_t i = count; + int err; + + while (i) { + err = twl4030_reg_write(twl4030, offset, *buf); + if (err) + return (ssize_t)err; + buf++; + i--; + offset++; + } + + return count; +} + +static struct file_operations twl_fops = { + .lseek = dev_lseek_default, + .read = twl_read, + .write = twl_write, +}; + +static int twl_probe(struct device_d *dev) +{ + if (twl_dev) + return -EBUSY; + + twl_dev = xzalloc(sizeof(struct twl4030)); + twl_dev->cdev.name = DRIVERNAME; + twl_dev->client = to_i2c_client(dev); + twl_dev->cdev.size = 1024; + twl_dev->cdev.dev = dev; + twl_dev->cdev.ops = &twl_fops; + + devfs_create(&twl_dev->cdev); + + return 0; +} + +static struct driver_d twl_driver = { + .name = DRIVERNAME, + .probe = twl_probe, +}; + +static int twl_init(void) +{ + register_driver(&twl_driver); + return 0; +} + +device_initcall(twl_init); |