sysmo-bts
/
barebox
9
0
Fork 0
Code Releases Activity

mfd mc13892: Add spi support 

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2010-10-10 19:53:39 +02:00
parent 17f799e6ab
commit 44f3c38d95
3 changed files with 112 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/boards/freescale-mx35-3-stack/3stack.c
View File

@ -111,7 +111,7 @@ static struct device_d smc911x_dev = {
static struct i2c_board_info i2c_devices[] = {
{
I2C_BOARD_INFO("mc13892", 0x08),
I2C_BOARD_INFO("mc13892-i2c", 0x08),
}, {
I2C_BOARD_INFO("mc9sdz60", 0x69),
},

2
drivers/mfd/Kconfig
View File

@ -1,7 +1,7 @@
menu MFD
config I2C_MC13892
depends on I2C
depends on I2C || SPI
bool "MC13892 a.k.a. PMIC driver"
config I2C_MC34704

119
drivers/mfd/mc13892.c
View File

@ -24,6 +24,7 @@
#include <driver.h>
#include <xfuncs.h>
#include <errno.h>
#include <spi/spi.h>
#include <i2c/i2c.h>
#include <mfd/mc13892.h>
@ -43,7 +44,56 @@ struct mc13892 *mc13892_get(void)
}
EXPORT_SYMBOL(mc13892_get);
int mc13892_reg_read(struct mc13892 *mc13892, enum mc13892_reg reg, u32 *val)
#ifdef CONFIG_SPI
static int spi_rw(struct spi_device *spi, void * buf, size_t len)
{
int ret;
struct spi_transfer t = {
.tx_buf = (const void *)buf,
.rx_buf = buf,
.len = len,
.cs_change = 0,
.delay_usecs = 0,
};
struct spi_message m;
spi_message_init(&m);
spi_message_add_tail(&t, &m);
if ((ret = spi_sync(spi, &m)))
return ret;
return 0;
}
#define MXC_PMIC_REG_NUM(reg) (((reg) & 0x3f) << 25)
#define MXC_PMIC_WRITE (1 << 31)
static int mc13892_spi_reg_read(struct mc13892 *mc13892, enum mc13892_reg reg, u32 *val)
{
uint32_t buf;
buf = MXC_PMIC_REG_NUM(reg);
spi_rw(mc13892->spi, &buf, 4);
*val = buf;
return 0;
}
static int mc13892_spi_reg_write(struct mc13892 *mc13892, enum mc13892_reg reg, u32 val)
{
uint32_t buf = MXC_PMIC_REG_NUM(reg) | MXC_PMIC_WRITE | (val & 0xffffff);
spi_rw(mc13892->spi, &buf, 4);
return 0;
}
#endif
#ifdef CONFIG_I2C
static int mc13892_i2c_reg_read(struct mc13892 *mc13892, enum mc13892_reg reg, u32 *val)
{
u8 buf[3];
int ret;
@ -53,9 +103,8 @@ int mc13892_reg_read(struct mc13892 *mc13892, enum mc13892_reg reg, u32 *val)
return ret == 3 ? 0 : ret;
}
EXPORT_SYMBOL(mc13892_reg_read)
int mc13892_reg_write(struct mc13892 *mc13892, enum mc13892_reg reg, u32 val)
static int mc13892_i2c_reg_write(struct mc13892 *mc13892, enum mc13892_reg reg, u32 val)
{
u8 buf[] = {
val >> 16,
@ -68,8 +117,36 @@ int mc13892_reg_write(struct mc13892 *mc13892, enum mc13892_reg reg, u32 val)
return ret == 3 ? 0 : ret;
}
#endif
int mc13892_reg_write(struct mc13892 *mc13892, enum mc13892_reg reg, u32 val)
{
#ifdef CONFIG_I2C
if (mc13892->mode == MC13892_MODE_I2C)
return mc13892_i2c_reg_write(mc13892, reg, val);
#endif
#ifdef CONFIG_SPI
if (mc13892->mode == MC13892_MODE_SPI)
return mc13892_spi_reg_write(mc13892, reg, val);
#endif
return -EINVAL;
}
EXPORT_SYMBOL(mc13892_reg_write)
int mc13892_reg_read(struct mc13892 *mc13892, enum mc13892_reg reg, u32 *val)
{
#ifdef CONFIG_I2C
if (mc13892->mode == MC13892_MODE_I2C)
return mc13892_i2c_reg_read(mc13892, reg, val);
#endif
#ifdef CONFIG_SPI
if (mc13892->mode == MC13892_MODE_SPI)
return mc13892_spi_reg_read(mc13892, reg, val);
#endif
return -EINVAL;
}
EXPORT_SYMBOL(mc13892_reg_read)
int mc13892_set_bits(struct mc13892 *mc13892, enum mc13892_reg reg, u32 mask, u32 val)
{
u32 tmp;
@ -133,14 +210,22 @@ static struct file_operations mc_fops = {
.write = mc_write,
};
static int mc_probe(struct device_d *dev)
static int mc_probe(struct device_d *dev, enum mc13892_mode mode)
{
if (mc_dev)
return -EBUSY;
mc_dev = xzalloc(sizeof(struct mc13892));
mc_dev->mode = mode;
mc_dev->cdev.name = DRIVERNAME;
mc_dev->client = to_i2c_client(dev);
if (mode == MC13892_MODE_I2C) {
mc_dev->client = to_i2c_client(dev);
}
if (mode == MC13892_MODE_SPI) {
mc_dev->spi = dev->type_data;
mc_dev->spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
mc_dev->spi->bits_per_word = 32;
}
mc_dev->cdev.size = 256;
mc_dev->cdev.dev = dev;
mc_dev->cdev.ops = &mc_fops;
@ -150,14 +235,30 @@ static int mc_probe(struct device_d *dev)
return 0;
}
static struct driver_d mc_driver = {
.name = DRIVERNAME,
.probe = mc_probe,
static int mc_i2c_probe(struct device_d *dev)
{
return mc_probe(dev, MC13892_MODE_I2C);
}
static int mc_spi_probe(struct device_d *dev)
{
return mc_probe(dev, MC13892_MODE_SPI);
}
static struct driver_d mc_i2c_driver = {
.name = "mc13892-i2c",
.probe = mc_i2c_probe,
};
static struct driver_d mc_spi_driver = {
.name = "mc13892-spi",
.probe = mc_spi_probe,
};
static int mc_init(void)
{
register_driver(&mc_driver);
register_driver(&mc_i2c_driver);
register_driver(&mc_spi_driver);
return 0;
}