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#include <common.h>
#include <twl4030.h>
#define BIT(x) (1 << (x))
/* GPIO_CTRL Fields */
#define MASK_GPIO_CTRL_GPIO_ON BIT(2)
/* store usage of each GPIO. - each bit represents one GPIO */
static unsigned int gpio_usage_count;
static inline int gpio_twl4030_write(u8 address, u8 data)
{
return twl4030_i2c_write_u8(TWL4030_CHIP_GPIO, data, address);
}
static inline int gpio_twl4030_read(u8 address)
{
u8 data;
int ret = 0;
ret = twl4030_i2c_read_u8(TWL4030_CHIP_GPIO, &data, address);
return (ret < 0) ? ret : data;
}
int twl4030_set_gpio_direction(unsigned int gpio, unsigned int is_input)
{
u8 d_bnk = gpio >> 3;
u8 d_msk = BIT(gpio & 0x7);
u8 reg = 0;
u8 base = REG_GPIODATADIR1 + d_bnk;
int ret = 0;
ret = gpio_twl4030_read(base);
if (ret >= 0) {
if (is_input)
reg = ret & ~d_msk;
else
reg = ret | d_msk;
ret = gpio_twl4030_write(base, reg);
}
return ret;
}
int twl4030_set_gpio_dataout(unsigned int gpio, unsigned int enable)
{
u8 d_bnk = gpio >> 3;
u8 d_msk = BIT(gpio & 0x7);
u8 base = 0;
if (enable)
base = REG_SETGPIODATAOUT1 + d_bnk;
else
base = REG_CLEARGPIODATAOUT1 + d_bnk;
return gpio_twl4030_write(base, d_msk);
}
int twl4030_get_gpio_datain(unsigned int gpio)
{
u8 d_bnk = gpio >> 3;
u8 d_off = gpio & 0x7;
u8 base = 0;
int ret = 0;
if (unlikely((gpio >= TWL4030_GPIO_MAX)
|| !(gpio_usage_count & BIT(gpio))))
return -1;
base = REG_GPIODATAIN1 + d_bnk;
ret = gpio_twl4030_read(base);
if (ret > 0)
ret = (ret >> d_off) & 0x1;
return ret;
}
int twl4030_request_gpio(unsigned int gpio)
{
int status = 0;
/* on first use, turn GPIO module "on" */
if (!gpio_usage_count) {
// struct twl4030_gpio_platform_data *pdata;
u8 value = MASK_GPIO_CTRL_GPIO_ON;
status = gpio_twl4030_write(REG_GPIO_CTRL, value);
}
if (!status)
gpio_usage_count |= (0x1 << gpio);
return status;
}
void twl4030_free_gpio(unsigned int gpio)
{
gpio_usage_count &= ~BIT(gpio);
/* on last use, switch off GPIO module */
if (!gpio_usage_count)
gpio_twl4030_write(REG_GPIO_CTRL, 0x0);
}
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