diff options
| author | Rickard Andersson <rickard.andersson@stericsson.com> | 2011-05-24 23:07:17 +0200 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2011-05-26 17:30:18 -0600 |
| commit | bc6f5cf6484a509cfe0533b8ddf8b8ca60f35557 (patch) | |
| tree | 6129c19354abc14e1e3b6a8b0fec9e4a89ab3662 /drivers/gpio/gpio-nomadik.c | |
| parent | 8ea72a30a31c30ec7fa0c30c743b2cec0712d143 (diff) | |
| download | lwn-bc6f5cf6484a509cfe0533b8ddf8b8ca60f35557.tar.gz lwn-bc6f5cf6484a509cfe0533b8ddf8b8ca60f35557.zip | |
gpio/nomadik: add function to read GPIO pull down status
Signed-off-by: Rickard Andersson <rickard.andersson@stericsson.com>
Reviewed-by: Martin Persson <martin.persson@stericsson.com>
[Split off from larger patch]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/gpio/gpio-nomadik.c')
| -rw-r--r-- | drivers/gpio/gpio-nomadik.c | 34 |
1 files changed, 30 insertions, 4 deletions
diff --git a/drivers/gpio/gpio-nomadik.c b/drivers/gpio/gpio-nomadik.c index 380204781f84..4961ef9bc153 100644 --- a/drivers/gpio/gpio-nomadik.c +++ b/drivers/gpio/gpio-nomadik.c @@ -57,6 +57,7 @@ struct nmk_gpio_chip { u32 fwimsc; u32 slpm; u32 enabled; + u32 pull_up; }; static struct nmk_gpio_chip * @@ -103,16 +104,22 @@ static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip, u32 pdis; pdis = readl(nmk_chip->addr + NMK_GPIO_PDIS); - if (pull == NMK_GPIO_PULL_NONE) + if (pull == NMK_GPIO_PULL_NONE) { pdis |= bit; - else + nmk_chip->pull_up &= ~bit; + } else { pdis &= ~bit; + } + writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS); - if (pull == NMK_GPIO_PULL_UP) + if (pull == NMK_GPIO_PULL_UP) { + nmk_chip->pull_up |= bit; writel(bit, nmk_chip->addr + NMK_GPIO_DATS); - else if (pull == NMK_GPIO_PULL_DOWN) + } else if (pull == NMK_GPIO_PULL_DOWN) { + nmk_chip->pull_up &= ~bit; writel(bit, nmk_chip->addr + NMK_GPIO_DATC); + } } static void __nmk_gpio_make_input(struct nmk_gpio_chip *nmk_chip, @@ -921,6 +928,25 @@ void nmk_gpio_wakeups_resume(void) } } +/* + * Read the pull up/pull down status. + * A bit set in 'pull_up' means that pull up + * is selected if pull is enabled in PDIS register. + * Note: only pull up/down set via this driver can + * be detected due to HW limitations. + */ +void nmk_gpio_read_pull(int gpio_bank, u32 *pull_up) +{ + if (gpio_bank < NUM_BANKS) { + struct nmk_gpio_chip *chip = nmk_gpio_chips[gpio_bank]; + + if (!chip) + return; + + *pull_up = chip->pull_up; + } +} + static int __devinit nmk_gpio_probe(struct platform_device *dev) { struct nmk_gpio_platform_data *pdata = dev->dev.platform_data; |