[media] xc4000: implemented power management

The following patch implements the xc4000_sleep() function.
The 'no_powerdown' module parameter is now interpreted differently:
  - 0 uses a device-specific default
  - 1 disables power management like before
  - 2 enables power management

Signed-off-by: Istvan Varga <istvan_v@mailbox.hu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/common/tuners/xc4000.c b/drivers/media/common/tuners/xc4000.c
index 0afb61f..c373f4b 100644 (file)
--- a/drivers/media/common/tuners/xc4000.c
+++ b/drivers/media/common/tuners/xc4000.c
@@ -43,9 +43,11 @@ MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
 
 static int no_poweroff;
 module_param(no_poweroff, int, 0644);
-MODULE_PARM_DESC(no_poweroff, "0 (default) powers device off when not used.\n"
-       "\t\t1 keep device energized and with tuner ready all the times.\n"
-       "\t\tFaster, but consumes more power and keeps the device hotter");
+MODULE_PARM_DESC(no_poweroff, "\n\t\t1: keep device energized and with tuner "
+       "ready all the times.\n"
+       "\t\tFaster, but consumes more power and keeps the device hotter.\n"
+       "\t\t2: powers device off when not used.\n"
+       "\t\t0 (default): use device-specific default mode.");
 
 #define XC4000_DEFAULT_FIRMWARE "xc4000.fw"
 
@@ -102,6 +104,7 @@ struct xc4000_priv {
 /* Misc Defines */
 #define MAX_TV_STANDARD                        24
 #define XC_MAX_I2C_WRITE_LENGTH                64
+#define XC_POWERED_DOWN                        0x80000000U
 
 /* Signal Types */
 #define XC_RF_MODE_AIR                 0
@@ -1365,8 +1368,34 @@ static int xc4000_get_status(struct dvb_frontend *fe, u32 *status)
 
 static int xc4000_sleep(struct dvb_frontend *fe)
 {
-       /* FIXME: djh disable this for now... */
-       return XC_RESULT_SUCCESS;
+       struct xc4000_priv *priv = fe->tuner_priv;
+       int     ret = XC_RESULT_SUCCESS;
+
+       dprintk(1, "%s()\n", __func__);
+
+       mutex_lock(&priv->lock);
+
+       /* Avoid firmware reload on slow devices */
+       if ((no_poweroff == 2 ||
+            (no_poweroff == 0 &&
+             priv->card_type != XC4000_CARD_WINFAST_CX88)) &&
+           (priv->cur_fw.type & BASE) != 0) {
+               /* force reset and firmware reload */
+               priv->cur_fw.type = XC_POWERED_DOWN;
+
+               if (xc_write_reg(priv, XREG_POWER_DOWN, 0)
+                   != XC_RESULT_SUCCESS) {
+                       printk(KERN_ERR
+                              "xc4000: %s() unable to shutdown tuner\n",
+                              __func__);
+                       ret = -EREMOTEIO;
+               }
+               xc_wait(20);
+       }
+
+       mutex_unlock(&priv->lock);
+
+       return ret;
 }
 
 static int xc4000_init(struct dvb_frontend *fe)