[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit

Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/drivers/mfd/wm831x-irq.c b/ap/os/linux/linux-3.4.x/drivers/mfd/wm831x-irq.c
new file mode 100644
index 0000000..bec4d05
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/mfd/wm831x-irq.c
@@ -0,0 +1,623 @@
+/*
+ * wm831x-irq.c  --  Interrupt controller support for Wolfson WM831x PMICs
+ *
+ * Copyright 2009 Wolfson Microelectronics PLC.
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/irq.h>
+#include <linux/mfd/core.h>
+#include <linux/interrupt.h>
+
+#include <linux/mfd/wm831x/core.h>
+#include <linux/mfd/wm831x/pdata.h>
+#include <linux/mfd/wm831x/gpio.h>
+#include <linux/mfd/wm831x/irq.h>
+
+#include <linux/delay.h>
+
+struct wm831x_irq_data {
+	int primary;
+	int reg;
+	int mask;
+};
+
+static struct wm831x_irq_data wm831x_irqs[] = {
+	[WM831X_IRQ_TEMP_THW] = {
+		.primary = WM831X_TEMP_INT,
+		.reg = 1,
+		.mask = WM831X_TEMP_THW_EINT,
+	},
+	[WM831X_IRQ_GPIO_1] = {
+		.primary = WM831X_GP_INT,
+		.reg = 5,
+		.mask = WM831X_GP1_EINT,
+	},
+	[WM831X_IRQ_GPIO_2] = {
+		.primary = WM831X_GP_INT,
+		.reg = 5,
+		.mask = WM831X_GP2_EINT,
+	},
+	[WM831X_IRQ_GPIO_3] = {
+		.primary = WM831X_GP_INT,
+		.reg = 5,
+		.mask = WM831X_GP3_EINT,
+	},
+	[WM831X_IRQ_GPIO_4] = {
+		.primary = WM831X_GP_INT,
+		.reg = 5,
+		.mask = WM831X_GP4_EINT,
+	},
+	[WM831X_IRQ_GPIO_5] = {
+		.primary = WM831X_GP_INT,
+		.reg = 5,
+		.mask = WM831X_GP5_EINT,
+	},
+	[WM831X_IRQ_GPIO_6] = {
+		.primary = WM831X_GP_INT,
+		.reg = 5,
+		.mask = WM831X_GP6_EINT,
+	},
+	[WM831X_IRQ_GPIO_7] = {
+		.primary = WM831X_GP_INT,
+		.reg = 5,
+		.mask = WM831X_GP7_EINT,
+	},
+	[WM831X_IRQ_GPIO_8] = {
+		.primary = WM831X_GP_INT,
+		.reg = 5,
+		.mask = WM831X_GP8_EINT,
+	},
+	[WM831X_IRQ_GPIO_9] = {
+		.primary = WM831X_GP_INT,
+		.reg = 5,
+		.mask = WM831X_GP9_EINT,
+	},
+	[WM831X_IRQ_GPIO_10] = {
+		.primary = WM831X_GP_INT,
+		.reg = 5,
+		.mask = WM831X_GP10_EINT,
+	},
+	[WM831X_IRQ_GPIO_11] = {
+		.primary = WM831X_GP_INT,
+		.reg = 5,
+		.mask = WM831X_GP11_EINT,
+	},
+	[WM831X_IRQ_GPIO_12] = {
+		.primary = WM831X_GP_INT,
+		.reg = 5,
+		.mask = WM831X_GP12_EINT,
+	},
+	[WM831X_IRQ_GPIO_13] = {
+		.primary = WM831X_GP_INT,
+		.reg = 5,
+		.mask = WM831X_GP13_EINT,
+	},
+	[WM831X_IRQ_GPIO_14] = {
+		.primary = WM831X_GP_INT,
+		.reg = 5,
+		.mask = WM831X_GP14_EINT,
+	},
+	[WM831X_IRQ_GPIO_15] = {
+		.primary = WM831X_GP_INT,
+		.reg = 5,
+		.mask = WM831X_GP15_EINT,
+	},
+	[WM831X_IRQ_GPIO_16] = {
+		.primary = WM831X_GP_INT,
+		.reg = 5,
+		.mask = WM831X_GP16_EINT,
+	},
+	[WM831X_IRQ_ON] = {
+		.primary = WM831X_ON_PIN_INT,
+		.reg = 1,
+		.mask = WM831X_ON_PIN_EINT,
+	},
+	[WM831X_IRQ_PPM_SYSLO] = {
+		.primary = WM831X_PPM_INT,
+		.reg = 1,
+		.mask = WM831X_PPM_SYSLO_EINT,
+	},
+	[WM831X_IRQ_PPM_PWR_SRC] = {
+		.primary = WM831X_PPM_INT,
+		.reg = 1,
+		.mask = WM831X_PPM_PWR_SRC_EINT,
+	},
+	[WM831X_IRQ_PPM_USB_CURR] = {
+		.primary = WM831X_PPM_INT,
+		.reg = 1,
+		.mask = WM831X_PPM_USB_CURR_EINT,
+	},
+	[WM831X_IRQ_WDOG_TO] = {
+		.primary = WM831X_WDOG_INT,
+		.reg = 1,
+		.mask = WM831X_WDOG_TO_EINT,
+	},
+	[WM831X_IRQ_RTC_PER] = {
+		.primary = WM831X_RTC_INT,
+		.reg = 1,
+		.mask = WM831X_RTC_PER_EINT,
+	},
+	[WM831X_IRQ_RTC_ALM] = {
+		.primary = WM831X_RTC_INT,
+		.reg = 1,
+		.mask = WM831X_RTC_ALM_EINT,
+	},
+	[WM831X_IRQ_CHG_BATT_HOT] = {
+		.primary = WM831X_CHG_INT,
+		.reg = 2,
+		.mask = WM831X_CHG_BATT_HOT_EINT,
+	},
+	[WM831X_IRQ_CHG_BATT_COLD] = {
+		.primary = WM831X_CHG_INT,
+		.reg = 2,
+		.mask = WM831X_CHG_BATT_COLD_EINT,
+	},
+	[WM831X_IRQ_CHG_BATT_FAIL] = {
+		.primary = WM831X_CHG_INT,
+		.reg = 2,
+		.mask = WM831X_CHG_BATT_FAIL_EINT,
+	},
+	[WM831X_IRQ_CHG_OV] = {
+		.primary = WM831X_CHG_INT,
+		.reg = 2,
+		.mask = WM831X_CHG_OV_EINT,
+	},
+	[WM831X_IRQ_CHG_END] = {
+		.primary = WM831X_CHG_INT,
+		.reg = 2,
+		.mask = WM831X_CHG_END_EINT,
+	},
+	[WM831X_IRQ_CHG_TO] = {
+		.primary = WM831X_CHG_INT,
+		.reg = 2,
+		.mask = WM831X_CHG_TO_EINT,
+	},
+	[WM831X_IRQ_CHG_MODE] = {
+		.primary = WM831X_CHG_INT,
+		.reg = 2,
+		.mask = WM831X_CHG_MODE_EINT,
+	},
+	[WM831X_IRQ_CHG_START] = {
+		.primary = WM831X_CHG_INT,
+		.reg = 2,
+		.mask = WM831X_CHG_START_EINT,
+	},
+	[WM831X_IRQ_TCHDATA] = {
+		.primary = WM831X_TCHDATA_INT,
+		.reg = 1,
+		.mask = WM831X_TCHDATA_EINT,
+	},
+	[WM831X_IRQ_TCHPD] = {
+		.primary = WM831X_TCHPD_INT,
+		.reg = 1,
+		.mask = WM831X_TCHPD_EINT,
+	},
+	[WM831X_IRQ_AUXADC_DATA] = {
+		.primary = WM831X_AUXADC_INT,
+		.reg = 1,
+		.mask = WM831X_AUXADC_DATA_EINT,
+	},
+	[WM831X_IRQ_AUXADC_DCOMP1] = {
+		.primary = WM831X_AUXADC_INT,
+		.reg = 1,
+		.mask = WM831X_AUXADC_DCOMP1_EINT,
+	},
+	[WM831X_IRQ_AUXADC_DCOMP2] = {
+		.primary = WM831X_AUXADC_INT,
+		.reg = 1,
+		.mask = WM831X_AUXADC_DCOMP2_EINT,
+	},
+	[WM831X_IRQ_AUXADC_DCOMP3] = {
+		.primary = WM831X_AUXADC_INT,
+		.reg = 1,
+		.mask = WM831X_AUXADC_DCOMP3_EINT,
+	},
+	[WM831X_IRQ_AUXADC_DCOMP4] = {
+		.primary = WM831X_AUXADC_INT,
+		.reg = 1,
+		.mask = WM831X_AUXADC_DCOMP4_EINT,
+	},
+	[WM831X_IRQ_CS1] = {
+		.primary = WM831X_CS_INT,
+		.reg = 2,
+		.mask = WM831X_CS1_EINT,
+	},
+	[WM831X_IRQ_CS2] = {
+		.primary = WM831X_CS_INT,
+		.reg = 2,
+		.mask = WM831X_CS2_EINT,
+	},
+	[WM831X_IRQ_HC_DC1] = {
+		.primary = WM831X_HC_INT,
+		.reg = 4,
+		.mask = WM831X_HC_DC1_EINT,
+	},
+	[WM831X_IRQ_HC_DC2] = {
+		.primary = WM831X_HC_INT,
+		.reg = 4,
+		.mask = WM831X_HC_DC2_EINT,
+	},
+	[WM831X_IRQ_UV_LDO1] = {
+		.primary = WM831X_UV_INT,
+		.reg = 3,
+		.mask = WM831X_UV_LDO1_EINT,
+	},
+	[WM831X_IRQ_UV_LDO2] = {
+		.primary = WM831X_UV_INT,
+		.reg = 3,
+		.mask = WM831X_UV_LDO2_EINT,
+	},
+	[WM831X_IRQ_UV_LDO3] = {
+		.primary = WM831X_UV_INT,
+		.reg = 3,
+		.mask = WM831X_UV_LDO3_EINT,
+	},
+	[WM831X_IRQ_UV_LDO4] = {
+		.primary = WM831X_UV_INT,
+		.reg = 3,
+		.mask = WM831X_UV_LDO4_EINT,
+	},
+	[WM831X_IRQ_UV_LDO5] = {
+		.primary = WM831X_UV_INT,
+		.reg = 3,
+		.mask = WM831X_UV_LDO5_EINT,
+	},
+	[WM831X_IRQ_UV_LDO6] = {
+		.primary = WM831X_UV_INT,
+		.reg = 3,
+		.mask = WM831X_UV_LDO6_EINT,
+	},
+	[WM831X_IRQ_UV_LDO7] = {
+		.primary = WM831X_UV_INT,
+		.reg = 3,
+		.mask = WM831X_UV_LDO7_EINT,
+	},
+	[WM831X_IRQ_UV_LDO8] = {
+		.primary = WM831X_UV_INT,
+		.reg = 3,
+		.mask = WM831X_UV_LDO8_EINT,
+	},
+	[WM831X_IRQ_UV_LDO9] = {
+		.primary = WM831X_UV_INT,
+		.reg = 3,
+		.mask = WM831X_UV_LDO9_EINT,
+	},
+	[WM831X_IRQ_UV_LDO10] = {
+		.primary = WM831X_UV_INT,
+		.reg = 3,
+		.mask = WM831X_UV_LDO10_EINT,
+	},
+	[WM831X_IRQ_UV_DC1] = {
+		.primary = WM831X_UV_INT,
+		.reg = 4,
+		.mask = WM831X_UV_DC1_EINT,
+	},
+	[WM831X_IRQ_UV_DC2] = {
+		.primary = WM831X_UV_INT,
+		.reg = 4,
+		.mask = WM831X_UV_DC2_EINT,
+	},
+	[WM831X_IRQ_UV_DC3] = {
+		.primary = WM831X_UV_INT,
+		.reg = 4,
+		.mask = WM831X_UV_DC3_EINT,
+	},
+	[WM831X_IRQ_UV_DC4] = {
+		.primary = WM831X_UV_INT,
+		.reg = 4,
+		.mask = WM831X_UV_DC4_EINT,
+	},
+};
+
+static inline int irq_data_to_status_reg(struct wm831x_irq_data *irq_data)
+{
+	return WM831X_INTERRUPT_STATUS_1 - 1 + irq_data->reg;
+}
+
+static inline struct wm831x_irq_data *irq_to_wm831x_irq(struct wm831x *wm831x,
+							int irq)
+{
+	return &wm831x_irqs[irq - wm831x->irq_base];
+}
+
+static void wm831x_irq_lock(struct irq_data *data)
+{
+	struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
+
+	mutex_lock(&wm831x->irq_lock);
+}
+
+static void wm831x_irq_sync_unlock(struct irq_data *data)
+{
+	struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(wm831x->gpio_update); i++) {
+		if (wm831x->gpio_update[i]) {
+			wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + i,
+					WM831X_GPN_INT_MODE | WM831X_GPN_POL,
+					wm831x->gpio_update[i]);
+			wm831x->gpio_update[i] = 0;
+		}
+	}
+
+	for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks_cur); i++) {
+		/* If there's been a change in the mask write it back
+		 * to the hardware. */
+		if (wm831x->irq_masks_cur[i] != wm831x->irq_masks_cache[i]) {
+			dev_dbg(wm831x->dev, "IRQ mask sync: %x = %x\n",
+				WM831X_INTERRUPT_STATUS_1_MASK + i,
+				wm831x->irq_masks_cur[i]);
+
+			wm831x->irq_masks_cache[i] = wm831x->irq_masks_cur[i];
+			wm831x_reg_write(wm831x,
+					 WM831X_INTERRUPT_STATUS_1_MASK + i,
+					 wm831x->irq_masks_cur[i]);
+		}
+	}
+
+	mutex_unlock(&wm831x->irq_lock);
+}
+
+static void wm831x_irq_enable(struct irq_data *data)
+{
+	struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
+	struct wm831x_irq_data *irq_data = irq_to_wm831x_irq(wm831x,
+							     data->irq);
+
+	wm831x->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
+}
+
+static void wm831x_irq_disable(struct irq_data *data)
+{
+	struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
+	struct wm831x_irq_data *irq_data = irq_to_wm831x_irq(wm831x,
+							     data->irq);
+
+	wm831x->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
+}
+
+static int wm831x_irq_set_type(struct irq_data *data, unsigned int type)
+{
+	struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
+	int irq;
+
+	irq = data->irq - wm831x->irq_base;
+
+	if (irq < WM831X_IRQ_GPIO_1 || irq > WM831X_IRQ_GPIO_11) {
+		/* Ignore internal-only IRQs */
+		if (irq >= 0 && irq < WM831X_NUM_IRQS)
+			return 0;
+		else
+			return -EINVAL;
+	}
+
+	/* Rebase the IRQ into the GPIO range so we've got a sensible array
+	 * index.
+	 */
+	irq -= WM831X_IRQ_GPIO_1;
+
+	/* We set the high bit to flag that we need an update; don't
+	 * do the update here as we can be called with the bus lock
+	 * held.
+	 */
+	switch (type) {
+	case IRQ_TYPE_EDGE_BOTH:
+		wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_INT_MODE;
+		wm831x->gpio_level[irq] = false;
+		break;
+	case IRQ_TYPE_EDGE_RISING:
+		wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_POL;
+		wm831x->gpio_level[irq] = false;
+		break;
+	case IRQ_TYPE_EDGE_FALLING:
+		wm831x->gpio_update[irq] = 0x10000;
+		wm831x->gpio_level[irq] = false;
+		break;
+	case IRQ_TYPE_LEVEL_HIGH:
+		wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_POL;
+		wm831x->gpio_level[irq] = true;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static struct irq_chip wm831x_irq_chip = {
+	.name			= "wm831x",
+	.irq_bus_lock		= wm831x_irq_lock,
+	.irq_bus_sync_unlock	= wm831x_irq_sync_unlock,
+	.irq_disable		= wm831x_irq_disable,
+	.irq_enable		= wm831x_irq_enable,
+	.irq_set_type		= wm831x_irq_set_type,
+};
+
+/* The processing of the primary interrupt occurs in a thread so that
+ * we can interact with the device over I2C or SPI. */
+static irqreturn_t wm831x_irq_thread(int irq, void *data)
+{
+	struct wm831x *wm831x = data;
+	unsigned int i;
+	int primary, status_addr, ret;
+	int status_regs[WM831X_NUM_IRQ_REGS] = { 0 };
+	int read[WM831X_NUM_IRQ_REGS] = { 0 };
+	int *status;
+
+	primary = wm831x_reg_read(wm831x, WM831X_SYSTEM_INTERRUPTS);
+	if (primary < 0) {
+		dev_err(wm831x->dev, "Failed to read system interrupt: %d\n",
+			primary);
+		goto out;
+	}
+
+	/* The touch interrupts are visible in the primary register as
+	 * an optimisation; open code this to avoid complicating the
+	 * main handling loop and so we can also skip iterating the
+	 * descriptors.
+	 */
+	if (primary & WM831X_TCHPD_INT)
+		handle_nested_irq(wm831x->irq_base + WM831X_IRQ_TCHPD);
+	if (primary & WM831X_TCHDATA_INT)
+		handle_nested_irq(wm831x->irq_base + WM831X_IRQ_TCHDATA);
+	primary &= ~(WM831X_TCHDATA_EINT | WM831X_TCHPD_EINT);
+
+	for (i = 0; i < ARRAY_SIZE(wm831x_irqs); i++) {
+		int offset = wm831x_irqs[i].reg - 1;
+
+		if (!(primary & wm831x_irqs[i].primary))
+			continue;
+
+		status = &status_regs[offset];
+
+		/* Hopefully there should only be one register to read
+		 * each time otherwise we ought to do a block read. */
+		if (!read[offset]) {
+			status_addr = irq_data_to_status_reg(&wm831x_irqs[i]);
+
+			*status = wm831x_reg_read(wm831x, status_addr);
+			if (*status < 0) {
+				dev_err(wm831x->dev,
+					"Failed to read IRQ status: %d\n",
+					*status);
+				goto out;
+			}
+
+			read[offset] = 1;
+
+			/* Ignore any bits that we don't think are masked */
+			*status &= ~wm831x->irq_masks_cur[offset];
+
+			/* Acknowledge now so we don't miss
+			 * notifications while we handle.
+			 */
+			wm831x_reg_write(wm831x, status_addr, *status);
+		}
+
+		if (*status & wm831x_irqs[i].mask)
+			handle_nested_irq(wm831x->irq_base + i);
+
+		/* Simulate an edge triggered IRQ by polling the input
+		 * status.  This is sucky but improves interoperability.
+		 */
+		if (primary == WM831X_GP_INT &&
+		    wm831x->gpio_level[i - WM831X_IRQ_GPIO_1]) {
+			ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
+			while (ret & 1 << (i - WM831X_IRQ_GPIO_1)) {
+				handle_nested_irq(wm831x->irq_base + i);
+				ret = wm831x_reg_read(wm831x,
+						      WM831X_GPIO_LEVEL);
+			}
+		}
+	}
+
+out:
+	return IRQ_HANDLED;
+}
+
+int wm831x_irq_init(struct wm831x *wm831x, int irq)
+{
+	struct wm831x_pdata *pdata = wm831x->dev->platform_data;
+	int i, cur_irq, ret;
+
+	mutex_init(&wm831x->irq_lock);
+
+	/* Mask the individual interrupt sources */
+	for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks_cur); i++) {
+		wm831x->irq_masks_cur[i] = 0xffff;
+		wm831x->irq_masks_cache[i] = 0xffff;
+		wm831x_reg_write(wm831x, WM831X_INTERRUPT_STATUS_1_MASK + i,
+				 0xffff);
+	}
+
+	/* Try to dynamically allocate IRQs if no base is specified */
+	if (!pdata || !pdata->irq_base)
+		wm831x->irq_base = -1;
+	else
+		wm831x->irq_base = pdata->irq_base;
+
+	wm831x->irq_base = irq_alloc_descs(wm831x->irq_base, 0,
+					   WM831X_NUM_IRQS, 0);
+	if (wm831x->irq_base < 0) {
+		dev_warn(wm831x->dev, "Failed to allocate IRQs: %d\n",
+			 wm831x->irq_base);
+		wm831x->irq_base = 0;
+		return 0;
+	}
+
+	if (pdata && pdata->irq_cmos)
+		i = 0;
+	else
+		i = WM831X_IRQ_OD;
+
+	wm831x_set_bits(wm831x, WM831X_IRQ_CONFIG,
+			WM831X_IRQ_OD, i);
+
+	/* Try to flag /IRQ as a wake source; there are a number of
+	 * unconditional wake sources in the PMIC so this isn't
+	 * conditional but we don't actually care *too* much if it
+	 * fails.
+	 */
+	ret = enable_irq_wake(irq);
+	if (ret != 0) {
+		dev_warn(wm831x->dev, "Can't enable IRQ as wake source: %d\n",
+			 ret);
+	}
+
+	wm831x->irq = irq;
+
+	/* Register them with genirq */
+	for (cur_irq = wm831x->irq_base;
+	     cur_irq < ARRAY_SIZE(wm831x_irqs) + wm831x->irq_base;
+	     cur_irq++) {
+		irq_set_chip_data(cur_irq, wm831x);
+		irq_set_chip_and_handler(cur_irq, &wm831x_irq_chip,
+					 handle_edge_irq);
+		irq_set_nested_thread(cur_irq, 1);
+
+		/* ARM needs us to explicitly flag the IRQ as valid
+		 * and will set them noprobe when we do so. */
+#ifdef CONFIG_ARM
+		set_irq_flags(cur_irq, IRQF_VALID);
+#else
+		irq_set_noprobe(cur_irq);
+#endif
+	}
+
+	if (irq) {
+		ret = request_threaded_irq(irq, NULL, wm831x_irq_thread,
+					   IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+					   "wm831x", wm831x);
+		if (ret != 0) {
+			dev_err(wm831x->dev, "Failed to request IRQ %d: %d\n",
+				irq, ret);
+			return ret;
+		}
+	} else {
+		dev_warn(wm831x->dev,
+			 "No interrupt specified - functionality limited\n");
+	}
+
+	/* Enable top level interrupts, we mask at secondary level */
+	wm831x_reg_write(wm831x, WM831X_SYSTEM_INTERRUPTS_MASK, 0);
+
+	return 0;
+}
+
+void wm831x_irq_exit(struct wm831x *wm831x)
+{
+	if (wm831x->irq)
+		free_irq(wm831x->irq, wm831x);
+}