(CR):[kane][sensor]:optimize the sar sensor power consumption

optimize the sar sensor power consumption when suspend

Change-Id: Ib5f09e2bb884f70a4689a7176ba9143a1183a320
Signed-off-by: zhangbin <zhangbin@huaqin.com>

diff --git a/drivers/input/misc/sx933x_sar.c b/drivers/input/misc/sx933x_sar.c
index e129aec8c6901527b151769e4c1afc042766a6c7..89975dafd7ae9618b0fd542d50f3f6da7c656fa4 100755 (executable)
--- a/drivers/input/misc/sx933x_sar.c
+++ b/drivers/input/misc/sx933x_sar.c
@@ -598,6 +598,7 @@ static void sx933x_reg_init(psx93XX_t this)
 static int initialize(psx93XX_t this)
 {
        int ret, retry;
+       u32 read_val;
        if (this)
        {
                LOG_DBG("SX933x income initialize\n");
@@ -613,12 +614,34 @@ static int initialize(psx93XX_t this)
                }
                /* wait until the reset has finished by monitoring NIRQ */
                LOG_DBG("Sent Software Reset. Waiting until device is back from reset to continue.\n");
+
+#if 1
+               for ( retry = 10; retry > 0; retry-- )
+               {
+                       msleep(5);
+                       sx933x_i2c_read_16bit(this, SX933X_HOSTIRQSRC_REG, &read_val);
+
+                       if( (read_val & MSK_IRQSTAT_RESET) == MSK_IRQSTAT_RESET)
+                       {
+                               break;
+                       }
+
+                       LOG_DBG("SX933x wait for reset irq retry:%d\n", 11 - retry);
+               }
+               ret = sx933x_global_variable_init(this);
+               msleep(5);
+               sx933x_reg_init(this);
+
+               //phase enable will compensate all pheases, so disable the manual compensation.
+               //manual_offset_calibration(this);
+#else
                /* just sleep for awhile instead of using a loop with reading irq status */
                msleep(100);
                ret = sx933x_global_variable_init(this);
                sx933x_reg_init(this);
                msleep(100); /* make sure everything is running */
                manual_offset_calibration(this);
+#endif
 
                /* re-enable interrupt handling */
                enable_irq(this->irq);
@@ -1125,7 +1148,8 @@ static int sx933x_suspend(struct device *dev)
        psx93XX_t this = dev_get_drvdata(dev);
        if (this) {
                disable_irq(this->irq);
-               //sx933x_i2c_write_16bit(this,SX933X_CPS_CTRL0_REG,0x20);//make sx933x in Sleep mode
+               LOG_INFO("enter %s\n",__func__);
+               sx933x_i2c_write_16bit(this,SX933X_GNRLCTRL2_REG,0x001F0000);//make sx933x in Sleep mode
        }
        return 0;
 }
@@ -1135,7 +1159,9 @@ static int sx933x_resume(struct device *dev)
        psx93XX_t this = dev_get_drvdata(dev);
        if (this) {
                enable_irq(this->irq);
-               //sx933x_i2c_write_16bit(this,SX933X_CPS_CTRL0_REG,0x27);//Exit from Sleep mode
+               LOG_INFO("enter %s\n",__func__);
+               sx933x_i2c_write_16bit(this,SX933X_GNRLCTRL2_REG,0x1F001F);//Exit from Sleep mode
+               sx933x_i2c_write_16bit(this,SX933X_CMD_REG, 0x0F);
        }
        return 0;
 }