static int msp_gpio_in(struct gpio_chip *chip, unsigned offset)
{
switch (MSP_GPIO_REG(offset)) {
case DM355EVM_MSP_SWITCH1:
case DM355EVM_MSP_SWITCH2:
case DM355EVM_MSP_SDMMC:
return 0;
default:
return -EINVAL;
}
}
static int msp_gpio_get(struct gpio_chip *chip, unsigned offset)
{
int reg, status;
reg = MSP_GPIO_REG(offset);
status = dm355evm_msp_read(reg);
if (status < 0)
return status;
if (reg == DM355EVM_MSP_LED)
msp_led_cache = status;
return status & MSP_GPIO_MASK(offset);
}
static int msp_gpio_out(struct gpio_chip *chip, unsigned offset, int value)
{
int mask, bits;
if (MSP_GPIO_REG(offset) != DM355EVM_MSP_LED)
return -EINVAL;
mask = MSP_GPIO_MASK(offset);
bits = msp_led_cache;
bits &= ~mask;
if (value)
bits |= mask;
msp_led_cache = bits;
return dm355evm_msp_write(bits, DM355EVM_MSP_LED);
}
static int msp_gpio_out(struct gpio_chip *chip, unsigned offset, int value)
{
int mask, bits;
/* NOTE: there are some other signals that could be
* packaged as output GPIOs, but they aren't as useful
* as the LEDs ... so for now we don't.
*/
if (MSP_GPIO_REG(offset) != DM355EVM_MSP_LED)
return -EINVAL;
mask = MSP_GPIO_MASK(offset);
bits = msp_led_cache;
bits &= ~mask;
if (value)
bits |= mask;
msp_led_cache = bits;
return dm355evm_msp_write(bits, DM355EVM_MSP_LED);
}