On Thu, 17 Jun 2010 20:57:19 +0530 (IST)
"kishore kadiyala" <kishore.kadiyala@xxxxxx> wrote:
> Adding card detect callback function which gives the status of
> the card .For MMC1 Controller, Card detect interrupt source is
> twl6030 and card present/absent status is provided by MMCCTRL
> register of twl6030.
>
>
> ...
>
>
> + int ret = -ENOSYS;
> + int ret = -ENOSYS;
ENOSYS seems an inappropriate errno to use in a driver.
"ENOSYS -- The system doesn't support that function. For example, if
you call setpgid() on a system without job control, you'll get an
ENOSYS error."
I think it means "you the programmer tried to do something in a syscall
which didn't make sense in this context".
I'm not sure what _is_ appropraite here. There's always EIO I guess.
ENODEV?
This happens a lot. The userspace errnos just don't map well onto
kernel-internal operations. it was a mistake - we should have defined a kernel-internal namespace and perhaps type for such things. Oh well.
> +/* Configuring Card Detect for MMC1 */
> +static inline int omap4_hsmmc1_card_detect_config(void)
> +{
> + int res = -1;
> + u8 reg_val = 0;
> +
> + /* Unmasking the Card detect Interrupt line for MMC1 from Phoenix */
> + if (twl_class_is_6030()) {
> + twl6030_interrupt_unmask(TWL6030_MMCDETECT_INT_MASK,
> + REG_INT_MSK_LINE_B);
> + twl6030_interrupt_unmask(TWL6030_MMCDETECT_INT_MASK,
> + REG_INT_MSK_STS_B);
> + }
> +
> +
> + /*
> + * Intially Configuring MMC_CTRL for receving interrupts &
> + * Card status on TWL6030 for MMC1
> + */
> + res = twl_i2c_read_u8(TWL6030_MODULE_ID0, ®_val, TWL6030_MMCCTRL);
> + if (res < 0)
> + return res;
> + reg_val &= ~VMMC_AUTO_OFF;
> + reg_val |= SW_FC;
> + twl_i2c_write_u8(TWL6030_MODULE_ID0, reg_val, TWL6030_MMCCTRL);
> +
> + /* Configuring CFG_INPUT_PUPD3 */
> + res = twl_i2c_read_u8(TWL6030_MODULE_ID0, ®_val,
> + TWL6030_CFG_INPUT_PUPD3);
> + if (res < 0)
> + return res;
> + reg_val &= ~(MMC_PU | MMC_PD);
> + twl_i2c_write_u8(TWL6030_MODULE_ID0, reg_val, TWL6030_CFG_INPUT_PUPD3);
> + return res;
> +}
This is waaaaay to large to be inlined. Why not put it in a .c file?
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