soc: swr: Add wakeup source for swr device

Voice call over headset does not disconnect on button press
while device is in suspend state. This is because inband interrupt
is not made wakeup capable. Make inband interrupt for swr tx as
wakeup capable. Also add wakeup source for swr device.

Change-Id: I5f2751672675bc8d62c4d2bfbbd651e640723d52
Signed-off-by: Vatsal Bucha <[email protected]>

soc/swr-mstr-ctrl.c

@@ -2055,6 +2055,7 @@ static int swrm_probe(struct platform_device *pdev)
 	swrm->slave_status = 0;
 	swrm->num_rx_chs = 0;
 	swrm->clk_ref_count = 0;
+	swrm->swr_irq_wakeup_capable = 0;
 	swrm->mclk_freq = MCLK_FREQ;
 	swrm->dev_up = true;
 	swrm->state = SWR_MSTR_UP;
@@ -2107,7 +2108,15 @@ static int swrm_probe(struct platform_device *pdev)
 		}
 
 	}
-
+	/* Make inband tx interrupts as wakeup capable for slave irq */
+	ret = of_property_read_u32(pdev->dev.of_node,
+				   "qcom,swr-mstr-irq-wakeup-capable",
+				   &swrm->swr_irq_wakeup_capable);
+	if (ret)
+		dev_dbg(swrm->dev, "%s: swrm irq wakeup capable not defined\n",
+			__func__);
+	if (swrm->swr_irq_wakeup_capable)
+		irq_set_irq_wake(swrm->irq, 1);
 	ret = swr_register_master(&swrm->master);
 	if (ret) {
 		dev_err(&pdev->dev, "%s: error adding swr master\n", __func__);
@@ -2152,6 +2161,13 @@ static int swrm_probe(struct platform_device *pdev)
 				   (void *) "swrm_reg_dump",
 				   &swrm_debug_ops);
 	}
+
+	ret = device_init_wakeup(swrm->dev, true);
+	if (ret) {
+		dev_err(swrm->dev, "Device wakeup init failed: %d\n", ret);
+		goto err_irq_wakeup_fail;
+	}
+
 	pm_runtime_set_autosuspend_delay(&pdev->dev, auto_suspend_timer);
 	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_runtime_set_active(&pdev->dev);
@@ -2163,6 +2179,8 @@ static int swrm_probe(struct platform_device *pdev)
 	msm_aud_evt_register_client(&swrm->event_notifier);
 
 	return 0;
+err_irq_wakeup_fail:
+	device_init_wakeup(swrm->dev, false);
 err_mstr_fail:
 	if (swrm->reg_irq)
 		swrm->reg_irq(swrm->handle, swr_mstr_interrupt,
@@ -2194,11 +2212,14 @@ static int swrm_remove(struct platform_device *pdev)
 		free_irq(swrm->irq, swrm);
 	else if (swrm->wake_irq > 0)
 		free_irq(swrm->wake_irq, swrm);
+	if (swrm->swr_irq_wakeup_capable)
+		irq_set_irq_wake(swrm->irq, 0);
 	cancel_work_sync(&swrm->wakeup_work);
 	pm_runtime_disable(&pdev->dev);
 	pm_runtime_set_suspended(&pdev->dev);
 	swr_unregister_master(&swrm->master);
 	msm_aud_evt_unregister_client(&swrm->event_notifier);
+	device_init_wakeup(swrm->dev, false);
 	mutex_destroy(&swrm->mlock);
 	mutex_destroy(&swrm->reslock);
 	mutex_destroy(&swrm->iolock);

soc/swr-mstr-ctrl.h

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
- * Copyright (c) 2015-2018, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2015-2019, The Linux Foundation. All rights reserved.
  */
 
 #ifndef _SWR_WCD_CTRL_H
@@ -155,6 +155,7 @@ struct swr_mstr_ctrl {
 	u32 intr_mask;
 	struct port_params **port_param;
 	u8 num_usecase;
+	u32 swr_irq_wakeup_capable;
 };
 
 #endif /* _SWR_WCD_CTRL_H */