1 files changed, 832 insertions, 0 deletions

diff --git a/drivers/input/keyboard/pxa27x_keypad.c b/drivers/input/keyboard/pxa27x_keypad.c
new file mode 100644
index 0000000000..3724363d14
--- /dev/null
+++ b/drivers/input/keyboard/pxa27x_keypad.c
@@ -0,0 +1,832 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * linux/drivers/input/keyboard/pxa27x_keypad.c
+ *
+ * Driver for the pxa27x matrix keyboard controller.
+ *
+ * Created:	Feb 22, 2007
+ * Author:	Rodolfo Giometti <giometti@linux.it>
+ *
+ * Based on a previous implementations by Kevin O'Connor
+ * <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and
+ * on some suggestions by Nicolas Pitre <nico@fluxnic.net>.
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/io.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/input/matrix_keypad.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+
+#include <linux/platform_data/keypad-pxa27x.h>
+/*
+ * Keypad Controller registers
+ */
+#define KPC             0x0000 /* Keypad Control register */
+#define KPDK            0x0008 /* Keypad Direct Key register */
+#define KPREC           0x0010 /* Keypad Rotary Encoder register */
+#define KPMK            0x0018 /* Keypad Matrix Key register */
+#define KPAS            0x0020 /* Keypad Automatic Scan register */
+
+/* Keypad Automatic Scan Multiple Key Presser register 0-3 */
+#define KPASMKP0        0x0028
+#define KPASMKP1        0x0030
+#define KPASMKP2        0x0038
+#define KPASMKP3        0x0040
+#define KPKDI           0x0048
+
+/* bit definitions */
+#define KPC_MKRN(n)	((((n) - 1) & 0x7) << 26) /* matrix key row number */
+#define KPC_MKCN(n)	((((n) - 1) & 0x7) << 23) /* matrix key column number */
+#define KPC_DKN(n)	((((n) - 1) & 0x7) << 6)  /* direct key number */
+
+#define KPC_AS          (0x1 << 30)  /* Automatic Scan bit */
+#define KPC_ASACT       (0x1 << 29)  /* Automatic Scan on Activity */
+#define KPC_MI          (0x1 << 22)  /* Matrix interrupt bit */
+#define KPC_IMKP        (0x1 << 21)  /* Ignore Multiple Key Press */
+
+#define KPC_MS(n)	(0x1 << (13 + (n)))	/* Matrix scan line 'n' */
+#define KPC_MS_ALL      (0xff << 13)
+
+#define KPC_ME          (0x1 << 12)  /* Matrix Keypad Enable */
+#define KPC_MIE         (0x1 << 11)  /* Matrix Interrupt Enable */
+#define KPC_DK_DEB_SEL	(0x1 <<  9)  /* Direct Keypad Debounce Select */
+#define KPC_DI          (0x1 <<  5)  /* Direct key interrupt bit */
+#define KPC_RE_ZERO_DEB (0x1 <<  4)  /* Rotary Encoder Zero Debounce */
+#define KPC_REE1        (0x1 <<  3)  /* Rotary Encoder1 Enable */
+#define KPC_REE0        (0x1 <<  2)  /* Rotary Encoder0 Enable */
+#define KPC_DE          (0x1 <<  1)  /* Direct Keypad Enable */
+#define KPC_DIE         (0x1 <<  0)  /* Direct Keypad interrupt Enable */
+
+#define KPDK_DKP        (0x1 << 31)
+#define KPDK_DK(n)	((n) & 0xff)
+
+#define KPREC_OF1       (0x1 << 31)
+#define kPREC_UF1       (0x1 << 30)
+#define KPREC_OF0       (0x1 << 15)
+#define KPREC_UF0       (0x1 << 14)
+
+#define KPREC_RECOUNT0(n)	((n) & 0xff)
+#define KPREC_RECOUNT1(n)	(((n) >> 16) & 0xff)
+
+#define KPMK_MKP        (0x1 << 31)
+#define KPAS_SO         (0x1 << 31)
+#define KPASMKPx_SO     (0x1 << 31)
+
+#define KPAS_MUKP(n)	(((n) >> 26) & 0x1f)
+#define KPAS_RP(n)	(((n) >> 4) & 0xf)
+#define KPAS_CP(n)	((n) & 0xf)
+
+#define KPASMKP_MKC_MASK	(0xff)
+
+#define keypad_readl(off)	__raw_readl(keypad->mmio_base + (off))
+#define keypad_writel(off, v)	__raw_writel((v), keypad->mmio_base + (off))
+
+#define MAX_MATRIX_KEY_NUM	(MAX_MATRIX_KEY_ROWS * MAX_MATRIX_KEY_COLS)
+#define MAX_KEYPAD_KEYS		(MAX_MATRIX_KEY_NUM + MAX_DIRECT_KEY_NUM)
+
+struct pxa27x_keypad {
+	const struct pxa27x_keypad_platform_data *pdata;
+
+	struct clk *clk;
+	struct input_dev *input_dev;
+	void __iomem *mmio_base;
+
+	int irq;
+
+	unsigned short keycodes[MAX_KEYPAD_KEYS];
+	int rotary_rel_code[2];
+
+	unsigned int row_shift;
+
+	/* state row bits of each column scan */
+	uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS];
+	uint32_t direct_key_state;
+
+	unsigned int direct_key_mask;
+};
+
+#ifdef CONFIG_OF
+static int pxa27x_keypad_matrix_key_parse_dt(struct pxa27x_keypad *keypad,
+				struct pxa27x_keypad_platform_data *pdata)
+{
+	struct input_dev *input_dev = keypad->input_dev;
+	struct device *dev = input_dev->dev.parent;
+	u32 rows, cols;
+	int error;
+
+	error = matrix_keypad_parse_properties(dev, &rows, &cols);
+	if (error)
+		return error;
+
+	if (rows > MAX_MATRIX_KEY_ROWS || cols > MAX_MATRIX_KEY_COLS) {
+		dev_err(dev, "rows or cols exceeds maximum value\n");
+		return -EINVAL;
+	}
+
+	pdata->matrix_key_rows = rows;
+	pdata->matrix_key_cols = cols;
+
+	error = matrix_keypad_build_keymap(NULL, NULL,
+					   pdata->matrix_key_rows,
+					   pdata->matrix_key_cols,
+					   keypad->keycodes, input_dev);
+	if (error)
+		return error;
+
+	return 0;
+}
+
+static int pxa27x_keypad_direct_key_parse_dt(struct pxa27x_keypad *keypad,
+				struct pxa27x_keypad_platform_data *pdata)
+{
+	struct input_dev *input_dev = keypad->input_dev;
+	struct device *dev = input_dev->dev.parent;
+	struct device_node *np = dev->of_node;
+	const __be16 *prop;
+	unsigned short code;
+	unsigned int proplen, size;
+	int i;
+	int error;
+
+	error = of_property_read_u32(np, "marvell,direct-key-count",
+				     &pdata->direct_key_num);
+	if (error) {
+		/*
+		 * If do not have marvel,direct-key-count defined,
+		 * it means direct key is not supported.
+		 */
+		return error == -EINVAL ? 0 : error;
+	}
+
+	error = of_property_read_u32(np, "marvell,direct-key-mask",
+				     &pdata->direct_key_mask);
+	if (error) {
+		if (error != -EINVAL)
+			return error;
+
+		/*
+		 * If marvell,direct-key-mask is not defined, driver will use
+		 * default value. Default value is set when configure the keypad.
+		 */
+		pdata->direct_key_mask = 0;
+	}
+
+	pdata->direct_key_low_active = of_property_read_bool(np,
+					"marvell,direct-key-low-active");
+
+	prop = of_get_property(np, "marvell,direct-key-map", &proplen);
+	if (!prop)
+		return -EINVAL;
+
+	if (proplen % sizeof(u16))
+		return -EINVAL;
+
+	size = proplen / sizeof(u16);
+
+	/* Only MAX_DIRECT_KEY_NUM is accepted.*/
+	if (size > MAX_DIRECT_KEY_NUM)
+		return -EINVAL;
+
+	for (i = 0; i < size; i++) {
+		code = be16_to_cpup(prop + i);
+		keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = code;
+		__set_bit(code, input_dev->keybit);
+	}
+
+	return 0;
+}
+
+static int pxa27x_keypad_rotary_parse_dt(struct pxa27x_keypad *keypad,
+				struct pxa27x_keypad_platform_data *pdata)
+{
+	const __be32 *prop;
+	int i, relkey_ret;
+	unsigned int code, proplen;
+	const char *rotaryname[2] = {
+			"marvell,rotary0", "marvell,rotary1"};
+	const char relkeyname[] = {"marvell,rotary-rel-key"};
+	struct input_dev *input_dev = keypad->input_dev;
+	struct device *dev = input_dev->dev.parent;
+	struct device_node *np = dev->of_node;
+
+	relkey_ret = of_property_read_u32(np, relkeyname, &code);
+	/* if can read correct rotary key-code, we do not need this. */
+	if (relkey_ret == 0) {
+		unsigned short relcode;
+
+		/* rotary0 taks lower half, rotary1 taks upper half. */
+		relcode = code & 0xffff;
+		pdata->rotary0_rel_code = (code & 0xffff);
+		__set_bit(relcode, input_dev->relbit);
+
+		relcode = code >> 16;
+		pdata->rotary1_rel_code = relcode;
+		__set_bit(relcode, input_dev->relbit);
+	}
+
+	for (i = 0; i < 2; i++) {
+		prop = of_get_property(np, rotaryname[i], &proplen);
+		/*
+		 * If the prop is not set, it means keypad does not need
+		 * initialize the rotaryX.
+		 */
+		if (!prop)
+			continue;
+
+		code = be32_to_cpup(prop);
+		/*
+		 * Not all up/down key code are valid.
+		 * Now we depends on direct-rel-code.
+		 */
+		if ((!(code & 0xffff) || !(code >> 16)) && relkey_ret) {
+			return relkey_ret;
+		} else {
+			unsigned int n = MAX_MATRIX_KEY_NUM + (i << 1);
+			unsigned short keycode;
+
+			keycode = code & 0xffff;
+			keypad->keycodes[n] = keycode;
+			__set_bit(keycode, input_dev->keybit);
+
+			keycode = code >> 16;
+			keypad->keycodes[n + 1] = keycode;
+			__set_bit(keycode, input_dev->keybit);
+
+			if (i == 0)
+				pdata->rotary0_rel_code = -1;
+			else
+				pdata->rotary1_rel_code = -1;
+		}
+		if (i == 0)
+			pdata->enable_rotary0 = 1;
+		else
+			pdata->enable_rotary1 = 1;
+	}
+
+	keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
+	keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
+
+	return 0;
+}
+
+static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad)
+{
+	struct input_dev *input_dev = keypad->input_dev;
+	struct device *dev = input_dev->dev.parent;
+	struct device_node *np = dev->of_node;
+	struct pxa27x_keypad_platform_data *pdata;
+	int error;
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata) {
+		dev_err(dev, "failed to allocate memory for pdata\n");
+		return -ENOMEM;
+	}
+
+	error = pxa27x_keypad_matrix_key_parse_dt(keypad, pdata);
+	if (error) {
+		dev_err(dev, "failed to parse matrix key\n");
+		return error;
+	}
+
+	error = pxa27x_keypad_direct_key_parse_dt(keypad, pdata);
+	if (error) {
+		dev_err(dev, "failed to parse direct key\n");
+		return error;
+	}
+
+	error = pxa27x_keypad_rotary_parse_dt(keypad, pdata);
+	if (error) {
+		dev_err(dev, "failed to parse rotary key\n");
+		return error;
+	}
+
+	error = of_property_read_u32(np, "marvell,debounce-interval",
+				     &pdata->debounce_interval);
+	if (error) {
+		dev_err(dev, "failed to parse debounce-interval\n");
+		return error;
+	}
+
+	/*
+	 * The keycodes may not only includes matrix key but also the direct
+	 * key or rotary key.
+	 */
+	input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
+
+	keypad->pdata = pdata;
+	return 0;
+}
+
+#else
+
+static int pxa27x_keypad_build_keycode_from_dt(struct pxa27x_keypad *keypad)
+{
+	dev_info(keypad->input_dev->dev.parent, "missing platform data\n");
+
+	return -EINVAL;
+}
+
+#endif
+
+static int pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad)
+{
+	const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
+	struct input_dev *input_dev = keypad->input_dev;
+	unsigned short keycode;
+	int i;
+	int error;
+
+	error = matrix_keypad_build_keymap(pdata->matrix_keymap_data, NULL,
+					   pdata->matrix_key_rows,
+					   pdata->matrix_key_cols,
+					   keypad->keycodes, input_dev);
+	if (error)
+		return error;
+
+	/*
+	 * The keycodes may not only include matrix keys but also the direct
+	 * or rotary keys.
+	 */
+	input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
+
+	/* For direct keys. */
+	for (i = 0; i < pdata->direct_key_num; i++) {
+		keycode = pdata->direct_key_map[i];
+		keypad->keycodes[MAX_MATRIX_KEY_NUM + i] = keycode;
+		__set_bit(keycode, input_dev->keybit);
+	}
+
+	if (pdata->enable_rotary0) {
+		if (pdata->rotary0_up_key && pdata->rotary0_down_key) {
+			keycode = pdata->rotary0_up_key;
+			keypad->keycodes[MAX_MATRIX_KEY_NUM + 0] = keycode;
+			__set_bit(keycode, input_dev->keybit);
+
+			keycode = pdata->rotary0_down_key;
+			keypad->keycodes[MAX_MATRIX_KEY_NUM + 1] = keycode;
+			__set_bit(keycode, input_dev->keybit);
+
+			keypad->rotary_rel_code[0] = -1;
+		} else {
+			keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
+			__set_bit(pdata->rotary0_rel_code, input_dev->relbit);
+		}
+	}
+
+	if (pdata->enable_rotary1) {
+		if (pdata->rotary1_up_key && pdata->rotary1_down_key) {
+			keycode = pdata->rotary1_up_key;
+			keypad->keycodes[MAX_MATRIX_KEY_NUM + 2] = keycode;
+			__set_bit(keycode, input_dev->keybit);
+
+			keycode = pdata->rotary1_down_key;
+			keypad->keycodes[MAX_MATRIX_KEY_NUM + 3] = keycode;
+			__set_bit(keycode, input_dev->keybit);
+
+			keypad->rotary_rel_code[1] = -1;
+		} else {
+			keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
+			__set_bit(pdata->rotary1_rel_code, input_dev->relbit);
+		}
+	}
+
+	__clear_bit(KEY_RESERVED, input_dev->keybit);
+
+	return 0;
+}
+
+static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad)
+{
+	const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
+	struct input_dev *input_dev = keypad->input_dev;
+	int row, col, num_keys_pressed = 0;
+	uint32_t new_state[MAX_MATRIX_KEY_COLS];
+	uint32_t kpas = keypad_readl(KPAS);
+
+	num_keys_pressed = KPAS_MUKP(kpas);
+
+	memset(new_state, 0, sizeof(new_state));
+
+	if (num_keys_pressed == 0)
+		goto scan;
+
+	if (num_keys_pressed == 1) {
+		col = KPAS_CP(kpas);
+		row = KPAS_RP(kpas);
+
+		/* if invalid row/col, treat as no key pressed */
+		if (col >= pdata->matrix_key_cols ||
+		    row >= pdata->matrix_key_rows)
+			goto scan;
+
+		new_state[col] = (1 << row);
+		goto scan;
+	}
+
+	if (num_keys_pressed > 1) {
+		uint32_t kpasmkp0 = keypad_readl(KPASMKP0);
+		uint32_t kpasmkp1 = keypad_readl(KPASMKP1);
+		uint32_t kpasmkp2 = keypad_readl(KPASMKP2);
+		uint32_t kpasmkp3 = keypad_readl(KPASMKP3);
+
+		new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
+		new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
+		new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
+		new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
+		new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
+		new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
+		new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
+		new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
+	}
+scan:
+	for (col = 0; col < pdata->matrix_key_cols; col++) {
+		uint32_t bits_changed;
+		int code;
+
+		bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
+		if (bits_changed == 0)
+			continue;
+
+		for (row = 0; row < pdata->matrix_key_rows; row++) {
+			if ((bits_changed & (1 << row)) == 0)
+				continue;
+
+			code = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
+
+			input_event(input_dev, EV_MSC, MSC_SCAN, code);
+			input_report_key(input_dev, keypad->keycodes[code],
+					 new_state[col] & (1 << row));
+		}
+	}
+	input_sync(input_dev);
+	memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
+}
+
+#define DEFAULT_KPREC	(0x007f007f)
+
+static inline int rotary_delta(uint32_t kprec)
+{
+	if (kprec & KPREC_OF0)
+		return (kprec & 0xff) + 0x7f;
+	else if (kprec & KPREC_UF0)
+		return (kprec & 0xff) - 0x7f - 0xff;
+	else
+		return (kprec & 0xff) - 0x7f;
+}
+
+static void report_rotary_event(struct pxa27x_keypad *keypad, int r, int delta)
+{
+	struct input_dev *dev = keypad->input_dev;
+
+	if (delta == 0)
+		return;
+
+	if (keypad->rotary_rel_code[r] == -1) {
+		int code = MAX_MATRIX_KEY_NUM + 2 * r + (delta > 0 ? 0 : 1);
+		unsigned char keycode = keypad->keycodes[code];
+
+		/* simulate a press-n-release */
+		input_event(dev, EV_MSC, MSC_SCAN, code);
+		input_report_key(dev, keycode, 1);
+		input_sync(dev);
+		input_event(dev, EV_MSC, MSC_SCAN, code);
+		input_report_key(dev, keycode, 0);
+		input_sync(dev);
+	} else {
+		input_report_rel(dev, keypad->rotary_rel_code[r], delta);
+		input_sync(dev);
+	}
+}
+
+static void pxa27x_keypad_scan_rotary(struct pxa27x_keypad *keypad)
+{
+	const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
+	uint32_t kprec;
+
+	/* read and reset to default count value */
+	kprec = keypad_readl(KPREC);
+	keypad_writel(KPREC, DEFAULT_KPREC);
+
+	if (pdata->enable_rotary0)
+		report_rotary_event(keypad, 0, rotary_delta(kprec));
+
+	if (pdata->enable_rotary1)
+		report_rotary_event(keypad, 1, rotary_delta(kprec >> 16));
+}
+
+static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad)
+{
+	const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
+	struct input_dev *input_dev = keypad->input_dev;
+	unsigned int new_state;
+	uint32_t kpdk, bits_changed;
+	int i;
+
+	kpdk = keypad_readl(KPDK);
+
+	if (pdata->enable_rotary0 || pdata->enable_rotary1)
+		pxa27x_keypad_scan_rotary(keypad);
+
+	/*
+	 * The KPDR_DK only output the key pin level, so it relates to board,
+	 * and low level may be active.
+	 */
+	if (pdata->direct_key_low_active)
+		new_state = ~KPDK_DK(kpdk) & keypad->direct_key_mask;
+	else
+		new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
+
+	bits_changed = keypad->direct_key_state ^ new_state;
+
+	if (bits_changed == 0)
+		return;
+
+	for (i = 0; i < pdata->direct_key_num; i++) {
+		if (bits_changed & (1 << i)) {
+			int code = MAX_MATRIX_KEY_NUM + i;
+
+			input_event(input_dev, EV_MSC, MSC_SCAN, code);
+			input_report_key(input_dev, keypad->keycodes[code],
+					 new_state & (1 << i));
+		}
+	}
+	input_sync(input_dev);
+	keypad->direct_key_state = new_state;
+}
+
+static void clear_wakeup_event(struct pxa27x_keypad *keypad)
+{
+	const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
+
+	if (pdata->clear_wakeup_event)
+		(pdata->clear_wakeup_event)();
+}
+
+static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
+{
+	struct pxa27x_keypad *keypad = dev_id;
+	unsigned long kpc = keypad_readl(KPC);
+
+	clear_wakeup_event(keypad);
+
+	if (kpc & KPC_DI)
+		pxa27x_keypad_scan_direct(keypad);
+
+	if (kpc & KPC_MI)
+		pxa27x_keypad_scan_matrix(keypad);
+
+	return IRQ_HANDLED;
+}
+
+static void pxa27x_keypad_config(struct pxa27x_keypad *keypad)
+{
+	const struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
+	unsigned int mask = 0, direct_key_num = 0;
+	unsigned long kpc = 0;
+
+	/* clear pending interrupt bit */
+	keypad_readl(KPC);
+
+	/* enable matrix keys with automatic scan */
+	if (pdata->matrix_key_rows && pdata->matrix_key_cols) {
+		kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL;
+		kpc |= KPC_MKRN(pdata->matrix_key_rows) |
+		       KPC_MKCN(pdata->matrix_key_cols);
+	}
+
+	/* enable rotary key, debounce interval same as direct keys */
+	if (pdata->enable_rotary0) {
+		mask |= 0x03;
+		direct_key_num = 2;
+		kpc |= KPC_REE0;
+	}
+
+	if (pdata->enable_rotary1) {
+		mask |= 0x0c;
+		direct_key_num = 4;
+		kpc |= KPC_REE1;
+	}
+
+	if (pdata->direct_key_num > direct_key_num)
+		direct_key_num = pdata->direct_key_num;
+
+	/*
+	 * Direct keys usage may not start from KP_DKIN0, check the platfrom
+	 * mask data to config the specific.
+	 */
+	if (pdata->direct_key_mask)
+		keypad->direct_key_mask = pdata->direct_key_mask;
+	else
+		keypad->direct_key_mask = ((1 << direct_key_num) - 1) & ~mask;
+
+	/* enable direct key */
+	if (direct_key_num)
+		kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num);
+
+	keypad_writel(KPC, kpc | KPC_RE_ZERO_DEB);
+	keypad_writel(KPREC, DEFAULT_KPREC);
+	keypad_writel(KPKDI, pdata->debounce_interval);
+}
+
+static int pxa27x_keypad_open(struct input_dev *dev)
+{
+	struct pxa27x_keypad *keypad = input_get_drvdata(dev);
+	int ret;
+	/* Enable unit clock */
+	ret = clk_prepare_enable(keypad->clk);
+	if (ret)
+		return ret;
+
+	pxa27x_keypad_config(keypad);
+
+	return 0;
+}
+
+static void pxa27x_keypad_close(struct input_dev *dev)
+{
+	struct pxa27x_keypad *keypad = input_get_drvdata(dev);
+
+	/* Disable clock unit */
+	clk_disable_unprepare(keypad->clk);
+}
+
+static int pxa27x_keypad_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
+
+	/*
+	 * If the keypad is used a wake up source, clock can not be disabled.
+	 * Or it can not detect the key pressing.
+	 */
+	if (device_may_wakeup(&pdev->dev))
+		enable_irq_wake(keypad->irq);
+	else
+		clk_disable_unprepare(keypad->clk);
+
+	return 0;
+}
+
+static int pxa27x_keypad_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
+	struct input_dev *input_dev = keypad->input_dev;
+	int ret = 0;
+
+	/*
+	 * If the keypad is used as wake up source, the clock is not turned
+	 * off. So do not need configure it again.
+	 */
+	if (device_may_wakeup(&pdev->dev)) {
+		disable_irq_wake(keypad->irq);
+	} else {
+		mutex_lock(&input_dev->mutex);
+
+		if (input_device_enabled(input_dev)) {
+			/* Enable unit clock */
+			ret = clk_prepare_enable(keypad->clk);
+			if (!ret)
+				pxa27x_keypad_config(keypad);
+		}
+
+		mutex_unlock(&input_dev->mutex);
+	}
+
+	return ret;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(pxa27x_keypad_pm_ops,
+				pxa27x_keypad_suspend, pxa27x_keypad_resume);
+
+
+static int pxa27x_keypad_probe(struct platform_device *pdev)
+{
+	const struct pxa27x_keypad_platform_data *pdata =
+					dev_get_platdata(&pdev->dev);
+	struct device_node *np = pdev->dev.of_node;
+	struct pxa27x_keypad *keypad;
+	struct input_dev *input_dev;
+	int irq, error;
+
+	/* Driver need build keycode from device tree or pdata */
+	if (!np && !pdata)
+		return -EINVAL;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return -ENXIO;
+
+	keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad),
+			      GFP_KERNEL);
+	if (!keypad)
+		return -ENOMEM;
+
+	input_dev = devm_input_allocate_device(&pdev->dev);
+	if (!input_dev)
+		return -ENOMEM;
+
+	keypad->pdata = pdata;
+	keypad->input_dev = input_dev;
+	keypad->irq = irq;
+
+	keypad->mmio_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(keypad->mmio_base))
+		return PTR_ERR(keypad->mmio_base);
+
+	keypad->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(keypad->clk)) {
+		dev_err(&pdev->dev, "failed to get keypad clock\n");
+		return PTR_ERR(keypad->clk);
+	}
+
+	input_dev->name = pdev->name;
+	input_dev->id.bustype = BUS_HOST;
+	input_dev->open = pxa27x_keypad_open;
+	input_dev->close = pxa27x_keypad_close;
+	input_dev->dev.parent = &pdev->dev;
+
+	input_dev->keycode = keypad->keycodes;
+	input_dev->keycodesize = sizeof(keypad->keycodes[0]);
+	input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
+
+	input_set_drvdata(input_dev, keypad);
+
+	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
+	input_set_capability(input_dev, EV_MSC, MSC_SCAN);
+
+	if (pdata) {
+		error = pxa27x_keypad_build_keycode(keypad);
+	} else {
+		error = pxa27x_keypad_build_keycode_from_dt(keypad);
+		/*
+		 * Data that we get from DT resides in dynamically
+		 * allocated memory so we need to update our pdata
+		 * pointer.
+		 */
+		pdata = keypad->pdata;
+	}
+	if (error) {
+		dev_err(&pdev->dev, "failed to build keycode\n");
+		return error;
+	}
+
+	keypad->row_shift = get_count_order(pdata->matrix_key_cols);
+
+	if ((pdata->enable_rotary0 && keypad->rotary_rel_code[0] != -1) ||
+	    (pdata->enable_rotary1 && keypad->rotary_rel_code[1] != -1)) {
+		input_dev->evbit[0] |= BIT_MASK(EV_REL);
+	}
+
+	error = devm_request_irq(&pdev->dev, irq, pxa27x_keypad_irq_handler,
+				 0, pdev->name, keypad);
+	if (error) {
+		dev_err(&pdev->dev, "failed to request IRQ\n");
+		return error;
+	}
+
+	/* Register the input device */
+	error = input_register_device(input_dev);
+	if (error) {
+		dev_err(&pdev->dev, "failed to register input device\n");
+		return error;
+	}
+
+	platform_set_drvdata(pdev, keypad);
+	device_init_wakeup(&pdev->dev, 1);
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id pxa27x_keypad_dt_match[] = {
+	{ .compatible = "marvell,pxa27x-keypad" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, pxa27x_keypad_dt_match);
+#endif
+
+static struct platform_driver pxa27x_keypad_driver = {
+	.probe		= pxa27x_keypad_probe,
+	.driver		= {
+		.name	= "pxa27x-keypad",
+		.of_match_table = of_match_ptr(pxa27x_keypad_dt_match),
+		.pm	= pm_sleep_ptr(&pxa27x_keypad_pm_ops),
+	},
+};
+module_platform_driver(pxa27x_keypad_driver);
+
+MODULE_DESCRIPTION("PXA27x Keypad Controller Driver");
+MODULE_LICENSE("GPL");
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:pxa27x-keypad");