V4L/DVB (10167): sms1xxx: add support for inverted gpio

negative gpio values signify inverted polarity

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 13 insertions, 4 deletions

diff --git a/drivers/media/dvb/siano/sms-cards.c b/drivers/media/dvb/siano/sms-cards.c
index fd62e0b85621..5a9882ffeb42 100644
--- a/drivers/media/dvb/siano/sms-cards.c
+++ b/drivers/media/dvb/siano/sms-cards.c
@@ -131,9 +131,10 @@ struct sms_board *sms_get_board(int id)
         return &sms_boards[id];
 }
 
-static int sms_set_gpio(struct smscore_device_t *coredev, u32 pin, int enable)
+static int sms_set_gpio(struct smscore_device_t *coredev, int pin, int enable)
 {
-        int ret;
+        int lvl, ret;
+        u32 gpio;
         struct smscore_gpio_config gpioconfig = {
                 .direction            = SMS_GPIO_DIRECTION_OUTPUT,
                 .pullupdown           = SMS_GPIO_PULLUPDOWN_NONE,
@@ -145,12 +146,20 @@ static int sms_set_gpio(struct smscore_device_t *coredev, u32 pin, int enable)
         if (pin == 0)
                 return -EINVAL;
 
-        ret = smscore_configure_gpio(coredev, pin, &gpioconfig);
+        if (pin < 0) {
+                /* inverted gpio */
+                gpio = pin * -1;
+                lvl = enable ? 0 : 1;
+        } else {
+                gpio = pin;
+                lvl = enable ? 1 : 0;
+        }
 
+        ret = smscore_configure_gpio(coredev, gpio, &gpioconfig);
         if (ret < 0)
                 return ret;
 
-        return smscore_set_gpio(coredev, pin, enable);
+        return smscore_set_gpio(coredev, gpio, lvl);
 }
 
 int sms_board_setup(struct smscore_device_t *coredev)