[PATCH v2 03/10] mfd: wcd9335: add wcd irq support

[Srinivas Kandagatla <srinivas.kandagatla@linaro.org>]

WCD9335 supports two lines of irqs INTR1 and INTR2.
Multiple interrupts are muxed via these lines.
INTR1 consists of all possible interrupt sources like:
Ear OCP, HPH OCP, MBHC, MAD, VBAT, and SVA
INTR2 is a subset of first interrupt sources like MAD, VBAT, and SVA

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
 drivers/mfd/Makefile                |   2 +-
 drivers/mfd/wcd9335-core.c          |   9 ++
 drivers/mfd/wcd9335-irq.c           | 172 ++++++++++++++++++++++++++++++++++++
 include/dt-bindings/mfd/wcd9335.h   |  43 +++++++++
 include/linux/mfd/wcd9335/wcd9335.h |   3 +
 5 files changed, 228 insertions(+), 1 deletion(-)
 create mode 100644 drivers/mfd/wcd9335-irq.c
 create mode 100644 include/dt-bindings/mfd/wcd9335.h

diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index a4697370640b..210875afe78a 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -58,7 +58,7 @@ obj-$(CONFIG_MFD_ARIZONA)	+= cs47l24-tables.o
 endif
 
 obj-$(CONFIG_MFD_WCD9335)	+= wcd9335.o
-wcd9335-objs			:= wcd9335-core.o
+wcd9335-objs			:= wcd9335-core.o wcd9335-irq.o
 
 obj-$(CONFIG_MFD_WM8400)	+= wm8400-core.o
 wm831x-objs			:= wm831x-core.o wm831x-irq.o wm831x-otp.o
diff --git a/drivers/mfd/wcd9335-core.c b/drivers/mfd/wcd9335-core.c
index 8f746901f4e9..6299dfb63aca 100644
--- a/drivers/mfd/wcd9335-core.c
+++ b/drivers/mfd/wcd9335-core.c
@@ -243,12 +243,20 @@ static int wcd9335_slim_status(struct slim_device *sdev,
 		return ret;
 	}
 
+	wcd9335_irq_init(wcd);
 	wcd->slim_ifd = wcd->slim_ifd;
 
 	return mfd_add_devices(wcd->dev, 0, wcd9335_devices,
 			       ARRAY_SIZE(wcd9335_devices), NULL, 0, NULL);
 }
 
+static void wcd9335_slim_remove(struct slim_device *sdev)
+{
+	struct wcd9335 *wcd = dev_get_drvdata(&sdev->dev);
+
+	wcd9335_irq_exit(wcd);
+}
+
 static const struct slim_device_id wcd9335_slim_id[] = {
 	{0x217, 0x1a0, 0x1, 0x0},
 	{}
@@ -259,6 +267,7 @@ static struct slim_driver wcd9335_slim_driver = {
 		.name = "wcd9335-slim",
 	},
 	.probe = wcd9335_slim_probe,
+	.remove = wcd9335_slim_remove,
 	.device_status = wcd9335_slim_status,
 	.id_table = wcd9335_slim_id,
 };
diff --git a/drivers/mfd/wcd9335-irq.c b/drivers/mfd/wcd9335-irq.c
new file mode 100644
index 000000000000..84098c89419b
--- /dev/null
+++ b/drivers/mfd/wcd9335-irq.c
@@ -0,0 +1,172 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2018, Linaro Limited
+//
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/regmap.h>
+#include <linux/of_irq.h>
+#include <dt-bindings/mfd/wcd9335.h>
+#include <linux/mfd/wcd9335/wcd9335.h>
+#include <linux/mfd/wcd9335/registers.h>
+
+static const struct regmap_irq wcd9335_irqs[] = {
+	/* INTR_REG 0 */
+	[WCD9335_IRQ_SLIMBUS] = {
+		.reg_offset = 0,
+		.mask = BIT(0),
+	},
+	[WCD9335_IRQ_FLL_LOCK_LOSS] = {
+		.reg_offset = 0,
+		.mask = BIT(1),
+	},
+	[WCD9335_IRQ_HPH_PA_OCPL_FAULT] = {
+		.reg_offset = 0,
+		.mask = BIT(2),
+	},
+	[WCD9335_IRQ_HPH_PA_OCPR_FAULT] = {
+		.reg_offset = 0,
+		.mask = BIT(3),
+	},
+	[WCD9335_IRQ_EAR_PA_OCP_FAULT] = {
+		.reg_offset = 0,
+		.mask = BIT(4),
+	},
+	[WCD9335_IRQ_HPH_PA_CNPL_COMPLETE] = {
+		.reg_offset = 0,
+		.mask = BIT(5),
+	},
+	[WCD9335_IRQ_HPH_PA_CNPR_COMPLETE] = {
+		.reg_offset = 0,
+		.mask = BIT(6),
+	},
+	[WCD9335_IRQ_EAR_PA_CNP_COMPLETE] = {
+		.reg_offset = 0,
+		.mask = BIT(7),
+	},
+	/* INTR_REG 1 */
+	[WCD9335_IRQ_MBHC_SW_DET] = {
+		.reg_offset = 1,
+		.mask = BIT(0),
+	},
+	[WCD9335_IRQ_MBHC_ELECT_INS_REM_DET] = {
+		.reg_offset = 1,
+		.mask = BIT(1),
+	},
+	[WCD9335_IRQ_MBHC_BUTTON_PRESS_DET] = {
+		.reg_offset = 1,
+		.mask = BIT(2),
+	},
+	[WCD9335_IRQ_MBHC_BUTTON_RELEASE_DET] = {
+		.reg_offset = 1,
+		.mask = BIT(3),
+	},
+	[WCD9335_IRQ_MBHC_ELECT_INS_REM_LEG_DET] = {
+		.reg_offset = 1,
+		.mask = BIT(4),
+	},
+	/* INTR_REG 2 */
+	[WCD9335_IRQ_LINE_PA1_CNP_COMPLETE] = {
+		.reg_offset = 2,
+		.mask = BIT(0),
+	},
+	[WCD9335_IRQ_LINE_PA2_CNP_COMPLETE] = {
+		.reg_offset = 2,
+		.mask = BIT(1),
+	},
+	[WCD9335_IRQ_LINE_PA3_CNP_COMPLETE] = {
+		.reg_offset = 2,
+		.mask = BIT(2),
+	},
+	[WCD9335_IRQ_LINE_PA4_CNP_COMPLETE] = {
+		.reg_offset = 2,
+		.mask = BIT(3),
+	},
+	[WCD9335_IRQ_SOUNDWIRE] = {
+		.reg_offset = 2,
+		.mask = BIT(4),
+	},
+	[WCD9335_IRQ_VDD_DIG_RAMP_COMPLETE] = {
+		.reg_offset = 2,
+		.mask = BIT(5),
+	},
+	[WCD9335_IRQ_RCO_ERROR] = {
+		.reg_offset = 2,
+		.mask = BIT(6),
+	},
+	[WCD9335_IRQ_SVA_ERROR] = {
+		.reg_offset = 2,
+		.mask = BIT(7),
+	},
+	/* INTR_REG 3 */
+	[WCD9335_IRQ_MAD_AUDIO] = {
+		.reg_offset = 3,
+		.mask = BIT(0),
+	},
+	[WCD9335_IRQ_MAD_BEACON] = {
+		.reg_offset = 3,
+		.mask = BIT(1),
+	},
+	[WCD9335_IRQ_MAD_ULTRASOUND] = {
+		.reg_offset = 3,
+		.mask = BIT(2),
+	},
+	[WCD9335_IRQ_VBAT_ATTACK] = {
+		.reg_offset = 3,
+		.mask = BIT(3),
+	},
+	[WCD9335_IRQ_VBAT_RESTORE] = {
+		.reg_offset = 3,
+		.mask = BIT(4),
+	},
+	[WCD9335_IRQ_SVA_OUTBOX1] = {
+		.reg_offset = 3,
+		.mask = BIT(5),
+	},
+	[WCD9335_IRQ_SVA_OUTBOX2] = {
+		.reg_offset = 3,
+		.mask = BIT(6),
+	},
+};
+
+static const struct regmap_irq_chip wcd9335_regmap_irq1_chip = {
+	.name = "wcd9335_pin1_irq",
+	.status_base = WCD9335_INTR_PIN1_STATUS0,
+	.mask_base = WCD9335_INTR_PIN1_MASK0,
+	.ack_base = WCD9335_INTR_PIN1_CLEAR0,
+	.type_base = WCD9335_INTR_LEVEL0,
+	.num_regs = 4,
+	.irqs = wcd9335_irqs,
+	.num_irqs = ARRAY_SIZE(wcd9335_irqs),
+};
+
+int wcd9335_irq_init(struct wcd9335 *wcd)
+{
+	int ret;
+	/*
+	 * INTR1 consists of all possible interrupt sources Ear OCP,
+	 * HPH OCP, MBHC, MAD, VBAT, and SVA
+	 * INTR2 is a subset of first interrupt sources MAD, VBAT, and SVA
+	 */
+	wcd->intr1 = of_irq_get_byname(wcd->dev->of_node, "intr1");
+	if (wcd->intr1 < 0 || wcd->intr1 == -EPROBE_DEFER) {
+		dev_err(wcd->dev, "Unable to configure irq\n");
+		return wcd->intr1;
+	}
+
+	ret = regmap_add_irq_chip(wcd->regmap, wcd->intr1,
+				 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+				 0, &wcd9335_regmap_irq1_chip,
+				 &wcd->irq_data);
+	if (ret != 0) {
+		dev_err(wcd->dev, "Failed to register IRQ chip: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+int wcd9335_irq_exit(struct wcd9335 *wcd)
+{
+	regmap_del_irq_chip(wcd->intr1, wcd->irq_data);
+	return 0;
+}
diff --git a/include/dt-bindings/mfd/wcd9335.h b/include/dt-bindings/mfd/wcd9335.h
new file mode 100644
index 000000000000..61b6a11da00d
--- /dev/null
+++ b/include/dt-bindings/mfd/wcd9335.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This header provides macros for WCD9335 device bindings.
+ *
+ * Copyright (c) 2018, Linaro Limited
+ */
+
+#ifndef _DT_BINDINGS_MFD_WCD9335_H
+#define _DT_BINDINGS_MFD_WCD9335_H
+
+#define	WCD9335_IRQ_SLIMBUS			0
+#define	WCD9335_IRQ_FLL_LOCK_LOSS		1
+#define	WCD9335_IRQ_HPH_PA_OCPL_FAULT		2
+#define	WCD9335_IRQ_HPH_PA_OCPR_FAULT		3
+#define	WCD9335_IRQ_EAR_PA_OCP_FAULT		4
+#define	WCD9335_IRQ_HPH_PA_CNPL_COMPLETE	5
+#define	WCD9335_IRQ_HPH_PA_CNPR_COMPLETE	6
+#define	WCD9335_IRQ_EAR_PA_CNP_COMPLETE		7
+#define	WCD9335_IRQ_MBHC_SW_DET			8
+#define	WCD9335_IRQ_MBHC_ELECT_INS_REM_DET	9
+#define	WCD9335_IRQ_MBHC_BUTTON_PRESS_DET	10
+#define	WCD9335_IRQ_MBHC_BUTTON_RELEASE_DET	11
+#define	WCD9335_IRQ_MBHC_ELECT_INS_REM_LEG_DET	12
+#define	WCD9335_IRQ_RESERVED_0			13
+#define	WCD9335_IRQ_RESERVED_1			14
+#define	WCD9335_IRQ_RESERVED_2			15
+#define	WCD9335_IRQ_LINE_PA1_CNP_COMPLETE	16
+#define	WCD9335_IRQ_LINE_PA2_CNP_COMPLETE	17
+#define	WCD9335_IRQ_LINE_PA3_CNP_COMPLETE	18
+#define	WCD9335_IRQ_LINE_PA4_CNP_COMPLETE	19
+#define	WCD9335_IRQ_SOUNDWIRE			20
+#define	WCD9335_IRQ_VDD_DIG_RAMP_COMPLETE	21
+#define	WCD9335_IRQ_RCO_ERROR			22
+#define	WCD9335_IRQ_SVA_ERROR			23
+#define	WCD9335_IRQ_MAD_AUDIO			24
+#define	WCD9335_IRQ_MAD_BEACON			25
+#define	WCD9335_IRQ_MAD_ULTRASOUND		26
+#define	WCD9335_IRQ_VBAT_ATTACK			27
+#define	WCD9335_IRQ_VBAT_RESTORE		28
+#define	WCD9335_IRQ_SVA_OUTBOX1			29
+#define	WCD9335_IRQ_SVA_OUTBOX2			30
+
+#endif /* _DT_BINDINGS_MFD_WCD9335_H */
diff --git a/include/linux/mfd/wcd9335/wcd9335.h b/include/linux/mfd/wcd9335/wcd9335.h
index b9d2f7af243a..1479bfe75f23 100644
--- a/include/linux/mfd/wcd9335/wcd9335.h
+++ b/include/linux/mfd/wcd9335/wcd9335.h
@@ -39,4 +39,7 @@ struct wcd9335 {
 	struct regulator_bulk_data supplies[WCD9335_MAX_SUPPLY];
 };
 
+extern int wcd9335_irq_init(struct wcd9335 *wcd);
+extern int wcd9335_irq_exit(struct wcd9335 *wcd);
+
 #endif /* __WCD9335_H__ */
-- 
2.16.2