V4L/DVB (9764): em28xx: Add support for suspend the device when not used

Several chips may be turned off when the device is not used, like audio,
video and dvb demods. This patch adds a gpio callback at the core
structs to allow turning off such devices.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

5 files changed, 21 insertions, 15 deletions

diff --git a/drivers/media/video/em28xx/em28xx-cards.c b/drivers/media/video/em28xx/em28xx-cards.c
index be78485c1664..a4b61e5a7635 100644
--- a/drivers/media/video/em28xx/em28xx-cards.c
+++ b/drivers/media/video/em28xx/em28xx-cards.c
@@ -1456,7 +1456,7 @@ void em28xx_pre_card_setup(struct em28xx *dev)
         em28xx_set_mode(dev, EM28XX_ANALOG_MODE);
 
         /* Unlock device */
-        em28xx_set_mode(dev, EM28XX_MODE_UNDEFINED);
+        em28xx_set_mode(dev, EM28XX_SUSPEND);
 }
 
 static void em28xx_setup_xc3028(struct em28xx *dev, struct xc2028_ctrl *ctl)
diff --git a/drivers/media/video/em28xx/em28xx-core.c b/drivers/media/video/em28xx/em28xx-core.c
index 71a1aaaa982e..c3ff8ad416e6 100644
--- a/drivers/media/video/em28xx/em28xx-core.c
+++ b/drivers/media/video/em28xx/em28xx-core.c
@@ -737,12 +737,14 @@ int em28xx_gpio_set(struct em28xx *dev, struct em28xx_reg_seq *gpio)
         if (!gpio)
                 return rc;
 
-        em28xx_write_reg(dev, 0x48, 0x00);
-        if (dev->mode == EM28XX_ANALOG_MODE)
-                em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
-        else
-                em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
-        msleep(6);
+        if (dev->mode != EM28XX_SUSPEND) {
+                em28xx_write_reg(dev, 0x48, 0x00);
+                if (dev->mode == EM28XX_ANALOG_MODE)
+                        em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x67);
+                else
+                        em28xx_write_reg(dev, EM28XX_R12_VINENABLE, 0x37);
+                msleep(6);
+        }
 
         /* Send GPIO reset sequences specified at board entry */
         while (gpio->sleep >= 0) {
@@ -767,9 +769,12 @@ int em28xx_set_mode(struct em28xx *dev, enum em28xx_mode set_mode)
         if (dev->mode == set_mode)
                 return 0;
 
-        if (set_mode == EM28XX_MODE_UNDEFINED) {
+        if (set_mode == EM28XX_SUSPEND) {
                 dev->mode = set_mode;
-                return 0;
+
+                /* FIXME: add suspend support for ac97 */
+
+                return em28xx_gpio_set(dev, dev->board.suspend_gpio);
         }
 
         dev->mode = set_mode;
diff --git a/drivers/media/video/em28xx/em28xx-dvb.c b/drivers/media/video/em28xx/em28xx-dvb.c
index 09c15cc088a6..211156d458f0 100644
--- a/drivers/media/video/em28xx/em28xx-dvb.c
+++ b/drivers/media/video/em28xx/em28xx-dvb.c
@@ -161,7 +161,7 @@ static int stop_streaming(struct em28xx_dvb *dvb)
 
         em28xx_uninit_isoc(dev);
 
-        em28xx_set_mode(dev, EM28XX_MODE_UNDEFINED);
+        em28xx_set_mode(dev, EM28XX_SUSPEND);
 
         return 0;
 }
@@ -215,7 +215,7 @@ static int em28xx_dvb_bus_ctrl(struct dvb_frontend *fe, int acquire)
         if (acquire)
                 return em28xx_set_mode(dev, EM28XX_DIGITAL_MODE);
         else
-                return em28xx_set_mode(dev, EM28XX_MODE_UNDEFINED);
+                return em28xx_set_mode(dev, EM28XX_SUSPEND);
 }
 
 /* ------------------------------------------------------------------ */
@@ -466,12 +466,12 @@ static int dvb_init(struct em28xx *dev)
         if (result < 0)
                 goto out_free;
 
-        em28xx_set_mode(dev, EM28XX_MODE_UNDEFINED);
+        em28xx_set_mode(dev, EM28XX_SUSPEND);
         printk(KERN_INFO "Successfully loaded em28xx-dvb\n");
         return 0;
 
 out_free:
-        em28xx_set_mode(dev, EM28XX_MODE_UNDEFINED);
+        em28xx_set_mode(dev, EM28XX_SUSPEND);
         kfree(dvb);
         dev->dvb = NULL;
         return result;
diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c
index 87e9f1d7a958..efa4c8253223 100644
--- a/drivers/media/video/em28xx/em28xx-video.c
+++ b/drivers/media/video/em28xx/em28xx-video.c
@@ -1697,7 +1697,7 @@ static int em28xx_v4l2_close(struct inode *inode, struct file *filp)
 
                 /* do this before setting alternate! */
                 em28xx_uninit_isoc(dev);
-                em28xx_set_mode(dev, EM28XX_MODE_UNDEFINED);
+                em28xx_set_mode(dev, EM28XX_SUSPEND);
 
                 /* set alternate 0 */
                 dev->alt = 0;
diff --git a/drivers/media/video/em28xx/em28xx.h b/drivers/media/video/em28xx/em28xx.h
index b2b41b3635e2..b505d44fed87 100644
--- a/drivers/media/video/em28xx/em28xx.h
+++ b/drivers/media/video/em28xx/em28xx.h
@@ -160,7 +160,7 @@
 #define EM2800_I2C_WRITE_TIMEOUT 20
 
 enum em28xx_mode {
-        EM28XX_MODE_UNDEFINED,
+        EM28XX_SUSPEND,
         EM28XX_ANALOG_MODE,
         EM28XX_DIGITAL_MODE,
 };
@@ -336,6 +336,7 @@ struct em28xx_board {
         unsigned int tda9887_conf;
 
         struct em28xx_reg_seq *dvb_gpio;
+        struct em28xx_reg_seq *suspend_gpio;
 
         unsigned int is_em2800:1;
         unsigned int has_msp34xx:1;