rk3x: pmic: rk818: support low battery detect,and slove otg error.

Add function:
1)battery voltage low then 3.0V not allow to power on.
2)battery voltage low then 3.4V have irq to wakeup from deep sleep.
3)disable otg_en when rk818 shutdown..

Signed-off-by: zhangqing <zhangqing@rock-chips.com>

diff --git a/drivers/mfd/rk818.c b/drivers/mfd/rk818.c
index c72a04a555c21b9c8ca0e7098e2cf58f59fcf026..aabee82ae19b88f6f03850730bed500a2f8423ff 100755 (executable)
--- a/drivers/mfd/rk818.c
+++ b/drivers/mfd/rk818.c
@@ -1029,6 +1029,9 @@ static void rk818_shutdown(void)
        pr_info("%s\n", __func__);
        ret = rk818_set_bits(rk818, RK818_INT_STS_MSK_REG1,(0x3<<5),(0x3<<5)); //close rtc int when power off
        ret = rk818_clear_bits(rk818, RK818_RTC_INT_REG,(0x3<<2)); //close rtc int when power off
+       /*disable otg_en*/
+       ret = rk818_clear_bits(rk818, RK818_DCDC_EN_REG, (0x1<<7));
+
        mutex_lock(&rk818->io_lock);
        mdelay(100);
 }
@@ -1063,14 +1066,43 @@ __weak void  rk818_device_suspend(void) {}
 __weak void  rk818_device_resume(void) {}
 #ifdef CONFIG_PM
 static int rk818_suspend(struct i2c_client *i2c, pm_message_t mesg)
-{              
+{
+       int ret, val;
+       struct rk818 *rk818 = g_rk818;
+
        rk818_device_suspend();
+       /************set vbat low 3v4 to irq**********/
+       val = rk818_reg_read(rk818, RK818_VB_MON_REG);
+       val &= (~(VBAT_LOW_VOL_MASK | VBAT_LOW_ACT_MASK));
+       val |= (RK818_VBAT_LOW_3V4 | EN_VBAT_LOW_IRQ);
+       ret = rk818_reg_write(rk818, RK818_VB_MON_REG, val);
+       if (ret < 0) {
+               pr_err("Unable to write RK818_VB_MON_REG reg\n");
+               return ret;
+       }
+       /*enable low irq*/
+       rk818_set_bits(rk818, 0x4d, (0x1 << 1), (0x0 << 1));
        return 0;
 }
 
 static int rk818_resume(struct i2c_client *i2c)
 {
+       int ret, val;
+       struct rk818 *rk818 = g_rk818;
+
        rk818_device_resume();
+       /********set vbat low 3v0 to shutdown**********/
+       val = rk818_reg_read(rk818, RK818_VB_MON_REG);
+       val &= (~(VBAT_LOW_VOL_MASK | VBAT_LOW_ACT_MASK));
+       val |= (RK818_VBAT_LOW_3V0 | EN_VABT_LOW_SHUT_DOWN);
+       ret = rk818_reg_write(rk818, RK818_VB_MON_REG, val);
+       if (ret < 0) {
+               pr_err("Unable to write RK818_VB_MON_REG reg\n");
+               return ret;
+       }
+       /*disable low irq*/
+       rk818_set_bits(rk818, 0x4d, (0x1 << 1), (0x1 << 1));
+
        return 0;
 }
 #else
@@ -1105,11 +1137,10 @@ static int rk818_pre_init(struct rk818 *rk818)
                return ret;
        }
        /****************************************/
-
        /****************set vbat low **********/
        val = rk818_reg_read(rk818,RK818_VB_MON_REG);
        val &=(~(VBAT_LOW_VOL_MASK | VBAT_LOW_ACT_MASK));
-       val |= (RK818_VBAT_LOW_3V5 | EN_VBAT_LOW_IRQ);
+       val |= (RK818_VBAT_LOW_3V0 | EN_VABT_LOW_SHUT_DOWN);
        ret = rk818_reg_write(rk818,RK818_VB_MON_REG,val);
        if (ret <0) {
                printk(KERN_ERR "Unable to write RK818_VB_MON_REG reg\n");
@@ -1118,6 +1149,7 @@ static int rk818_pre_init(struct rk818 *rk818)
        /**************************************/
 
        /**********mask int****************/
+
        val = rk818_reg_read(rk818,RK818_INT_STS_MSK_REG1);
        val |= (0x1<<0); //mask vout_lo_int
        ret = rk818_reg_write(rk818,RK818_INT_STS_MSK_REG1,val);
@@ -1125,6 +1157,7 @@ static int rk818_pre_init(struct rk818 *rk818)
                printk(KERN_ERR "Unable to write RK818_INT_STS_MSK_REG1 reg\n");
                return ret;
        }
+
        /**********************************/
        /**********enable clkout2****************/
        ret = rk818_reg_write(rk818,RK818_CLK32OUT_REG,0x01);