Initial import

1 files changed, 700 insertions, 0 deletions

diff --git a/drivers/input/keyboard/pmic8xxx-keypad.c b/drivers/input/keyboard/pmic8xxx-keypad.c
new file mode 100644
index 000000000..32580afec
--- /dev/null
+++ b/drivers/input/keyboard/pmic8xxx-keypad.c
@@ -0,0 +1,700 @@
+/* Copyright (c) 2009-2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+#include <linux/of.h>
+#include <linux/input/matrix_keypad.h>
+
+#define PM8XXX_MAX_ROWS		18
+#define PM8XXX_MAX_COLS		8
+#define PM8XXX_ROW_SHIFT	3
+#define PM8XXX_MATRIX_MAX_SIZE	(PM8XXX_MAX_ROWS * PM8XXX_MAX_COLS)
+
+#define PM8XXX_MIN_ROWS		5
+#define PM8XXX_MIN_COLS		5
+
+#define MAX_SCAN_DELAY		128
+#define MIN_SCAN_DELAY		1
+
+/* in nanoseconds */
+#define MAX_ROW_HOLD_DELAY	122000
+#define MIN_ROW_HOLD_DELAY	30500
+
+#define MAX_DEBOUNCE_TIME	20
+#define MIN_DEBOUNCE_TIME	5
+
+#define KEYP_CTRL			0x148
+
+#define KEYP_CTRL_EVNTS			BIT(0)
+#define KEYP_CTRL_EVNTS_MASK		0x3
+
+#define KEYP_CTRL_SCAN_COLS_SHIFT	5
+#define KEYP_CTRL_SCAN_COLS_MIN		5
+#define KEYP_CTRL_SCAN_COLS_BITS	0x3
+
+#define KEYP_CTRL_SCAN_ROWS_SHIFT	2
+#define KEYP_CTRL_SCAN_ROWS_MIN		5
+#define KEYP_CTRL_SCAN_ROWS_BITS	0x7
+
+#define KEYP_CTRL_KEYP_EN		BIT(7)
+
+#define KEYP_SCAN			0x149
+
+#define KEYP_SCAN_READ_STATE		BIT(0)
+#define KEYP_SCAN_DBOUNCE_SHIFT		1
+#define KEYP_SCAN_PAUSE_SHIFT		3
+#define KEYP_SCAN_ROW_HOLD_SHIFT	6
+
+#define KEYP_TEST			0x14A
+
+#define KEYP_TEST_CLEAR_RECENT_SCAN	BIT(6)
+#define KEYP_TEST_CLEAR_OLD_SCAN	BIT(5)
+#define KEYP_TEST_READ_RESET		BIT(4)
+#define KEYP_TEST_DTEST_EN		BIT(3)
+#define KEYP_TEST_ABORT_READ		BIT(0)
+
+#define KEYP_TEST_DBG_SELECT_SHIFT	1
+
+/* bits of these registers represent
+ * '0' for key press
+ * '1' for key release
+ */
+#define KEYP_RECENT_DATA		0x14B
+#define KEYP_OLD_DATA			0x14C
+
+#define KEYP_CLOCK_FREQ			32768
+
+/**
+ * struct pmic8xxx_kp - internal keypad data structure
+ * @num_cols - number of columns of keypad
+ * @num_rows - number of row of keypad
+ * @input - input device pointer for keypad
+ * @regmap - regmap handle
+ * @key_sense_irq - key press/release irq number
+ * @key_stuck_irq - key stuck notification irq number
+ * @keycodes - array to hold the key codes
+ * @dev - parent device pointer
+ * @keystate - present key press/release state
+ * @stuckstate - present state when key stuck irq
+ * @ctrl_reg - control register value
+ */
+struct pmic8xxx_kp {
+	unsigned int num_rows;
+	unsigned int num_cols;
+	struct input_dev *input;
+	struct regmap *regmap;
+	int key_sense_irq;
+	int key_stuck_irq;
+
+	unsigned short keycodes[PM8XXX_MATRIX_MAX_SIZE];
+
+	struct device *dev;
+	u16 keystate[PM8XXX_MAX_ROWS];
+	u16 stuckstate[PM8XXX_MAX_ROWS];
+
+	u8 ctrl_reg;
+};
+
+static u8 pmic8xxx_col_state(struct pmic8xxx_kp *kp, u8 col)
+{
+	/* all keys pressed on that particular row? */
+	if (col == 0x00)
+		return 1 << kp->num_cols;
+	else
+		return col & ((1 << kp->num_cols) - 1);
+}
+
+/*
+ * Synchronous read protocol for RevB0 onwards:
+ *
+ * 1. Write '1' to ReadState bit in KEYP_SCAN register
+ * 2. Wait 2*32KHz clocks, so that HW can successfully enter read mode
+ *    synchronously
+ * 3. Read rows in old array first if events are more than one
+ * 4. Read rows in recent array
+ * 5. Wait 4*32KHz clocks
+ * 6. Write '0' to ReadState bit of KEYP_SCAN register so that hw can
+ *    synchronously exit read mode.
+ */
+static int pmic8xxx_chk_sync_read(struct pmic8xxx_kp *kp)
+{
+	int rc;
+	unsigned int scan_val;
+
+	rc = regmap_read(kp->regmap, KEYP_SCAN, &scan_val);
+	if (rc < 0) {
+		dev_err(kp->dev, "Error reading KEYP_SCAN reg, rc=%d\n", rc);
+		return rc;
+	}
+
+	scan_val |= 0x1;
+
+	rc = regmap_write(kp->regmap, KEYP_SCAN, scan_val);
+	if (rc < 0) {
+		dev_err(kp->dev, "Error writing KEYP_SCAN reg, rc=%d\n", rc);
+		return rc;
+	}
+
+	/* 2 * 32KHz clocks */
+	udelay((2 * DIV_ROUND_UP(USEC_PER_SEC, KEYP_CLOCK_FREQ)) + 1);
+
+	return rc;
+}
+
+static int pmic8xxx_kp_read_data(struct pmic8xxx_kp *kp, u16 *state,
+					u16 data_reg, int read_rows)
+{
+	int rc, row;
+	unsigned int val;
+
+	for (row = 0; row < read_rows; row++) {
+		rc = regmap_read(kp->regmap, data_reg, &val);
+		if (rc)
+			return rc;
+		dev_dbg(kp->dev, "%d = %d\n", row, val);
+		state[row] = pmic8xxx_col_state(kp, val);
+	}
+
+	return 0;
+}
+
+static int pmic8xxx_kp_read_matrix(struct pmic8xxx_kp *kp, u16 *new_state,
+					 u16 *old_state)
+{
+	int rc, read_rows;
+	unsigned int scan_val;
+
+	if (kp->num_rows < PM8XXX_MIN_ROWS)
+		read_rows = PM8XXX_MIN_ROWS;
+	else
+		read_rows = kp->num_rows;
+
+	pmic8xxx_chk_sync_read(kp);
+
+	if (old_state) {
+		rc = pmic8xxx_kp_read_data(kp, old_state, KEYP_OLD_DATA,
+						read_rows);
+		if (rc < 0) {
+			dev_err(kp->dev,
+				"Error reading KEYP_OLD_DATA, rc=%d\n", rc);
+			return rc;
+		}
+	}
+
+	rc = pmic8xxx_kp_read_data(kp, new_state, KEYP_RECENT_DATA,
+					 read_rows);
+	if (rc < 0) {
+		dev_err(kp->dev,
+			"Error reading KEYP_RECENT_DATA, rc=%d\n", rc);
+		return rc;
+	}
+
+	/* 4 * 32KHz clocks */
+	udelay((4 * DIV_ROUND_UP(USEC_PER_SEC, KEYP_CLOCK_FREQ)) + 1);
+
+	rc = regmap_read(kp->regmap, KEYP_SCAN, &scan_val);
+	if (rc < 0) {
+		dev_err(kp->dev, "Error reading KEYP_SCAN reg, rc=%d\n", rc);
+		return rc;
+	}
+
+	scan_val &= 0xFE;
+	rc = regmap_write(kp->regmap, KEYP_SCAN, scan_val);
+	if (rc < 0)
+		dev_err(kp->dev, "Error writing KEYP_SCAN reg, rc=%d\n", rc);
+
+	return rc;
+}
+
+static void __pmic8xxx_kp_scan_matrix(struct pmic8xxx_kp *kp, u16 *new_state,
+					 u16 *old_state)
+{
+	int row, col, code;
+
+	for (row = 0; row < kp->num_rows; row++) {
+		int bits_changed = new_state[row] ^ old_state[row];
+
+		if (!bits_changed)
+			continue;
+
+		for (col = 0; col < kp->num_cols; col++) {
+			if (!(bits_changed & (1 << col)))
+				continue;
+
+			dev_dbg(kp->dev, "key [%d:%d] %s\n", row, col,
+					!(new_state[row] & (1 << col)) ?
+					"pressed" : "released");
+
+			code = MATRIX_SCAN_CODE(row, col, PM8XXX_ROW_SHIFT);
+
+			input_event(kp->input, EV_MSC, MSC_SCAN, code);
+			input_report_key(kp->input,
+					kp->keycodes[code],
+					!(new_state[row] & (1 << col)));
+
+			input_sync(kp->input);
+		}
+	}
+}
+
+static bool pmic8xxx_detect_ghost_keys(struct pmic8xxx_kp *kp, u16 *new_state)
+{
+	int row, found_first = -1;
+	u16 check, row_state;
+
+	check = 0;
+	for (row = 0; row < kp->num_rows; row++) {
+		row_state = (~new_state[row]) &
+				 ((1 << kp->num_cols) - 1);
+
+		if (hweight16(row_state) > 1) {
+			if (found_first == -1)
+				found_first = row;
+			if (check & row_state) {
+				dev_dbg(kp->dev, "detected ghost key on row[%d]"
+					 " and row[%d]\n", found_first, row);
+				return true;
+			}
+		}
+		check |= row_state;
+	}
+	return false;
+}
+
+static int pmic8xxx_kp_scan_matrix(struct pmic8xxx_kp *kp, unsigned int events)
+{
+	u16 new_state[PM8XXX_MAX_ROWS];
+	u16 old_state[PM8XXX_MAX_ROWS];
+	int rc;
+
+	switch (events) {
+	case 0x1:
+		rc = pmic8xxx_kp_read_matrix(kp, new_state, NULL);
+		if (rc < 0)
+			return rc;
+
+		/* detecting ghost key is not an error */
+		if (pmic8xxx_detect_ghost_keys(kp, new_state))
+			return 0;
+		__pmic8xxx_kp_scan_matrix(kp, new_state, kp->keystate);
+		memcpy(kp->keystate, new_state, sizeof(new_state));
+	break;
+	case 0x3: /* two events - eventcounter is gray-coded */
+		rc = pmic8xxx_kp_read_matrix(kp, new_state, old_state);
+		if (rc < 0)
+			return rc;
+
+		__pmic8xxx_kp_scan_matrix(kp, old_state, kp->keystate);
+		__pmic8xxx_kp_scan_matrix(kp, new_state, old_state);
+		memcpy(kp->keystate, new_state, sizeof(new_state));
+	break;
+	case 0x2:
+		dev_dbg(kp->dev, "Some key events were lost\n");
+		rc = pmic8xxx_kp_read_matrix(kp, new_state, old_state);
+		if (rc < 0)
+			return rc;
+		__pmic8xxx_kp_scan_matrix(kp, old_state, kp->keystate);
+		__pmic8xxx_kp_scan_matrix(kp, new_state, old_state);
+		memcpy(kp->keystate, new_state, sizeof(new_state));
+	break;
+	default:
+		rc = -EINVAL;
+	}
+	return rc;
+}
+
+/*
+ * NOTE: We are reading recent and old data registers blindly
+ * whenever key-stuck interrupt happens, because events counter doesn't
+ * get updated when this interrupt happens due to key stuck doesn't get
+ * considered as key state change.
+ *
+ * We are not using old data register contents after they are being read
+ * because it might report the key which was pressed before the key being stuck
+ * as stuck key because it's pressed status is stored in the old data
+ * register.
+ */
+static irqreturn_t pmic8xxx_kp_stuck_irq(int irq, void *data)
+{
+	u16 new_state[PM8XXX_MAX_ROWS];
+	u16 old_state[PM8XXX_MAX_ROWS];
+	int rc;
+	struct pmic8xxx_kp *kp = data;
+
+	rc = pmic8xxx_kp_read_matrix(kp, new_state, old_state);
+	if (rc < 0) {
+		dev_err(kp->dev, "failed to read keypad matrix\n");
+		return IRQ_HANDLED;
+	}
+
+	__pmic8xxx_kp_scan_matrix(kp, new_state, kp->stuckstate);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t pmic8xxx_kp_irq(int irq, void *data)
+{
+	struct pmic8xxx_kp *kp = data;
+	unsigned int ctrl_val, events;
+	int rc;
+
+	rc = regmap_read(kp->regmap, KEYP_CTRL, &ctrl_val);
+	if (rc < 0) {
+		dev_err(kp->dev, "failed to read keyp_ctrl register\n");
+		return IRQ_HANDLED;
+	}
+
+	events = ctrl_val & KEYP_CTRL_EVNTS_MASK;
+
+	rc = pmic8xxx_kp_scan_matrix(kp, events);
+	if (rc < 0)
+		dev_err(kp->dev, "failed to scan matrix\n");
+
+	return IRQ_HANDLED;
+}
+
+static int pmic8xxx_kpd_init(struct pmic8xxx_kp *kp,
+			     struct platform_device *pdev)
+{
+	const struct device_node *of_node = pdev->dev.of_node;
+	unsigned int scan_delay_ms;
+	unsigned int row_hold_ns;
+	unsigned int debounce_ms;
+	int bits, rc, cycles;
+	u8 scan_val = 0, ctrl_val = 0;
+	static const u8 row_bits[] = {
+		0, 1, 2, 3, 4, 4, 5, 5, 6, 6, 6, 7, 7, 7,
+	};
+
+	/* Find column bits */
+	if (kp->num_cols < KEYP_CTRL_SCAN_COLS_MIN)
+		bits = 0;
+	else
+		bits = kp->num_cols - KEYP_CTRL_SCAN_COLS_MIN;
+	ctrl_val = (bits & KEYP_CTRL_SCAN_COLS_BITS) <<
+		KEYP_CTRL_SCAN_COLS_SHIFT;
+
+	/* Find row bits */
+	if (kp->num_rows < KEYP_CTRL_SCAN_ROWS_MIN)
+		bits = 0;
+	else
+		bits = row_bits[kp->num_rows - KEYP_CTRL_SCAN_ROWS_MIN];
+
+	ctrl_val |= (bits << KEYP_CTRL_SCAN_ROWS_SHIFT);
+
+	rc = regmap_write(kp->regmap, KEYP_CTRL, ctrl_val);
+	if (rc < 0) {
+		dev_err(kp->dev, "Error writing KEYP_CTRL reg, rc=%d\n", rc);
+		return rc;
+	}
+
+	if (of_property_read_u32(of_node, "scan-delay", &scan_delay_ms))
+		scan_delay_ms = MIN_SCAN_DELAY;
+
+	if (scan_delay_ms > MAX_SCAN_DELAY || scan_delay_ms < MIN_SCAN_DELAY ||
+	    !is_power_of_2(scan_delay_ms)) {
+		dev_err(&pdev->dev, "invalid keypad scan time supplied\n");
+		return -EINVAL;
+	}
+
+	if (of_property_read_u32(of_node, "row-hold", &row_hold_ns))
+		row_hold_ns = MIN_ROW_HOLD_DELAY;
+
+	if (row_hold_ns > MAX_ROW_HOLD_DELAY ||
+	    row_hold_ns < MIN_ROW_HOLD_DELAY ||
+	    ((row_hold_ns % MIN_ROW_HOLD_DELAY) != 0)) {
+		dev_err(&pdev->dev, "invalid keypad row hold time supplied\n");
+		return -EINVAL;
+	}
+
+	if (of_property_read_u32(of_node, "debounce", &debounce_ms))
+		debounce_ms = MIN_DEBOUNCE_TIME;
+
+	if (((debounce_ms % 5) != 0) ||
+	    debounce_ms > MAX_DEBOUNCE_TIME ||
+	    debounce_ms < MIN_DEBOUNCE_TIME) {
+		dev_err(&pdev->dev, "invalid debounce time supplied\n");
+		return -EINVAL;
+	}
+
+	bits = (debounce_ms / 5) - 1;
+
+	scan_val |= (bits << KEYP_SCAN_DBOUNCE_SHIFT);
+
+	bits = fls(scan_delay_ms) - 1;
+	scan_val |= (bits << KEYP_SCAN_PAUSE_SHIFT);
+
+	/* Row hold time is a multiple of 32KHz cycles. */
+	cycles = (row_hold_ns * KEYP_CLOCK_FREQ) / NSEC_PER_SEC;
+
+	scan_val |= (cycles << KEYP_SCAN_ROW_HOLD_SHIFT);
+
+	rc = regmap_write(kp->regmap, KEYP_SCAN, scan_val);
+	if (rc)
+		dev_err(kp->dev, "Error writing KEYP_SCAN reg, rc=%d\n", rc);
+
+	return rc;
+
+}
+
+static int pmic8xxx_kp_enable(struct pmic8xxx_kp *kp)
+{
+	int rc;
+
+	kp->ctrl_reg |= KEYP_CTRL_KEYP_EN;
+
+	rc = regmap_write(kp->regmap, KEYP_CTRL, kp->ctrl_reg);
+	if (rc < 0)
+		dev_err(kp->dev, "Error writing KEYP_CTRL reg, rc=%d\n", rc);
+
+	return rc;
+}
+
+static int pmic8xxx_kp_disable(struct pmic8xxx_kp *kp)
+{
+	int rc;
+
+	kp->ctrl_reg &= ~KEYP_CTRL_KEYP_EN;
+
+	rc = regmap_write(kp->regmap, KEYP_CTRL, kp->ctrl_reg);
+	if (rc < 0)
+		return rc;
+
+	return rc;
+}
+
+static int pmic8xxx_kp_open(struct input_dev *dev)
+{
+	struct pmic8xxx_kp *kp = input_get_drvdata(dev);
+
+	return pmic8xxx_kp_enable(kp);
+}
+
+static void pmic8xxx_kp_close(struct input_dev *dev)
+{
+	struct pmic8xxx_kp *kp = input_get_drvdata(dev);
+
+	pmic8xxx_kp_disable(kp);
+}
+
+/*
+ * keypad controller should be initialized in the following sequence
+ * only, otherwise it might get into FSM stuck state.
+ *
+ * - Initialize keypad control parameters, like no. of rows, columns,
+ *   timing values etc.,
+ * - configure rows and column gpios pull up/down.
+ * - set irq edge type.
+ * - enable the keypad controller.
+ */
+static int pmic8xxx_kp_probe(struct platform_device *pdev)
+{
+	unsigned int rows, cols;
+	bool repeat;
+	bool wakeup;
+	struct pmic8xxx_kp *kp;
+	int rc;
+	unsigned int ctrl_val;
+
+	rc = matrix_keypad_parse_of_params(&pdev->dev, &rows, &cols);
+	if (rc)
+		return rc;
+
+	if (cols > PM8XXX_MAX_COLS || rows > PM8XXX_MAX_ROWS ||
+	    cols < PM8XXX_MIN_COLS) {
+		dev_err(&pdev->dev, "invalid platform data\n");
+		return -EINVAL;
+	}
+
+	repeat = !of_property_read_bool(pdev->dev.of_node,
+					"linux,input-no-autorepeat");
+	wakeup = of_property_read_bool(pdev->dev.of_node,
+					"linux,keypad-wakeup");
+
+	kp = devm_kzalloc(&pdev->dev, sizeof(*kp), GFP_KERNEL);
+	if (!kp)
+		return -ENOMEM;
+
+	kp->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!kp->regmap)
+		return -ENODEV;
+
+	platform_set_drvdata(pdev, kp);
+
+	kp->num_rows	= rows;
+	kp->num_cols	= cols;
+	kp->dev		= &pdev->dev;
+
+	kp->input = devm_input_allocate_device(&pdev->dev);
+	if (!kp->input) {
+		dev_err(&pdev->dev, "unable to allocate input device\n");
+		return -ENOMEM;
+	}
+
+	kp->key_sense_irq = platform_get_irq(pdev, 0);
+	if (kp->key_sense_irq < 0) {
+		dev_err(&pdev->dev, "unable to get keypad sense irq\n");
+		return kp->key_sense_irq;
+	}
+
+	kp->key_stuck_irq = platform_get_irq(pdev, 1);
+	if (kp->key_stuck_irq < 0) {
+		dev_err(&pdev->dev, "unable to get keypad stuck irq\n");
+		return kp->key_stuck_irq;
+	}
+
+	kp->input->name = "PMIC8XXX keypad";
+	kp->input->phys = "pmic8xxx_keypad/input0";
+
+	kp->input->id.bustype	= BUS_I2C;
+	kp->input->id.version	= 0x0001;
+	kp->input->id.product	= 0x0001;
+	kp->input->id.vendor	= 0x0001;
+
+	kp->input->open		= pmic8xxx_kp_open;
+	kp->input->close	= pmic8xxx_kp_close;
+
+	rc = matrix_keypad_build_keymap(NULL, NULL,
+					PM8XXX_MAX_ROWS, PM8XXX_MAX_COLS,
+					kp->keycodes, kp->input);
+	if (rc) {
+		dev_err(&pdev->dev, "failed to build keymap\n");
+		return rc;
+	}
+
+	if (repeat)
+		__set_bit(EV_REP, kp->input->evbit);
+	input_set_capability(kp->input, EV_MSC, MSC_SCAN);
+
+	input_set_drvdata(kp->input, kp);
+
+	/* initialize keypad state */
+	memset(kp->keystate, 0xff, sizeof(kp->keystate));
+	memset(kp->stuckstate, 0xff, sizeof(kp->stuckstate));
+
+	rc = pmic8xxx_kpd_init(kp, pdev);
+	if (rc < 0) {
+		dev_err(&pdev->dev, "unable to initialize keypad controller\n");
+		return rc;
+	}
+
+	rc = devm_request_any_context_irq(&pdev->dev, kp->key_sense_irq,
+			pmic8xxx_kp_irq, IRQF_TRIGGER_RISING, "pmic-keypad",
+			kp);
+	if (rc < 0) {
+		dev_err(&pdev->dev, "failed to request keypad sense irq\n");
+		return rc;
+	}
+
+	rc = devm_request_any_context_irq(&pdev->dev, kp->key_stuck_irq,
+			pmic8xxx_kp_stuck_irq, IRQF_TRIGGER_RISING,
+			"pmic-keypad-stuck", kp);
+	if (rc < 0) {
+		dev_err(&pdev->dev, "failed to request keypad stuck irq\n");
+		return rc;
+	}
+
+	rc = regmap_read(kp->regmap, KEYP_CTRL, &ctrl_val);
+	if (rc < 0) {
+		dev_err(&pdev->dev, "failed to read KEYP_CTRL register\n");
+		return rc;
+	}
+
+	kp->ctrl_reg = ctrl_val;
+
+	rc = input_register_device(kp->input);
+	if (rc < 0) {
+		dev_err(&pdev->dev, "unable to register keypad input device\n");
+		return rc;
+	}
+
+	device_init_wakeup(&pdev->dev, wakeup);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int pmic8xxx_kp_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct pmic8xxx_kp *kp = platform_get_drvdata(pdev);
+	struct input_dev *input_dev = kp->input;
+
+	if (device_may_wakeup(dev)) {
+		enable_irq_wake(kp->key_sense_irq);
+	} else {
+		mutex_lock(&input_dev->mutex);
+
+		if (input_dev->users)
+			pmic8xxx_kp_disable(kp);
+
+		mutex_unlock(&input_dev->mutex);
+	}
+
+	return 0;
+}
+
+static int pmic8xxx_kp_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct pmic8xxx_kp *kp = platform_get_drvdata(pdev);
+	struct input_dev *input_dev = kp->input;
+
+	if (device_may_wakeup(dev)) {
+		disable_irq_wake(kp->key_sense_irq);
+	} else {
+		mutex_lock(&input_dev->mutex);
+
+		if (input_dev->users)
+			pmic8xxx_kp_enable(kp);
+
+		mutex_unlock(&input_dev->mutex);
+	}
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(pm8xxx_kp_pm_ops,
+			 pmic8xxx_kp_suspend, pmic8xxx_kp_resume);
+
+static const struct of_device_id pm8xxx_match_table[] = {
+	{ .compatible = "qcom,pm8058-keypad" },
+	{ .compatible = "qcom,pm8921-keypad" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, pm8xxx_match_table);
+
+static struct platform_driver pmic8xxx_kp_driver = {
+	.probe		= pmic8xxx_kp_probe,
+	.driver		= {
+		.name = "pm8xxx-keypad",
+		.pm = &pm8xxx_kp_pm_ops,
+		.of_match_table = pm8xxx_match_table,
+	},
+};
+module_platform_driver(pmic8xxx_kp_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("PMIC8XXX keypad driver");
+MODULE_VERSION("1.0");
+MODULE_ALIAS("platform:pmic8xxx_keypad");
+MODULE_AUTHOR("Trilok Soni <tsoni@codeaurora.org>");