Initial import

1 files changed, 417 insertions, 0 deletions

diff --git a/drivers/input/keyboard/stmpe-keypad.c b/drivers/input/keyboard/stmpe-keypad.c
new file mode 100644
index 000000000..fe6e3f22e
--- /dev/null
+++ b/drivers/input/keyboard/stmpe-keypad.c
@@ -0,0 +1,417 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * License Terms: GNU General Public License, version 2
+ * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/input/matrix_keypad.h>
+#include <linux/mfd/stmpe.h>
+
+/* These are at the same addresses in all STMPE variants */
+#define STMPE_KPC_COL			0x60
+#define STMPE_KPC_ROW_MSB		0x61
+#define STMPE_KPC_ROW_LSB		0x62
+#define STMPE_KPC_CTRL_MSB		0x63
+#define STMPE_KPC_CTRL_LSB		0x64
+#define STMPE_KPC_COMBI_KEY_0		0x65
+#define STMPE_KPC_COMBI_KEY_1		0x66
+#define STMPE_KPC_COMBI_KEY_2		0x67
+#define STMPE_KPC_DATA_BYTE0		0x68
+#define STMPE_KPC_DATA_BYTE1		0x69
+#define STMPE_KPC_DATA_BYTE2		0x6a
+#define STMPE_KPC_DATA_BYTE3		0x6b
+#define STMPE_KPC_DATA_BYTE4		0x6c
+
+#define STMPE_KPC_CTRL_LSB_SCAN		(0x1 << 0)
+#define STMPE_KPC_CTRL_LSB_DEBOUNCE	(0x7f << 1)
+#define STMPE_KPC_CTRL_MSB_SCAN_COUNT	(0xf << 4)
+
+#define STMPE_KPC_ROW_MSB_ROWS		0xff
+
+#define STMPE_KPC_DATA_UP		(0x1 << 7)
+#define STMPE_KPC_DATA_ROW		(0xf << 3)
+#define STMPE_KPC_DATA_COL		(0x7 << 0)
+#define STMPE_KPC_DATA_NOKEY_MASK	0x78
+
+#define STMPE_KEYPAD_MAX_DEBOUNCE	127
+#define STMPE_KEYPAD_MAX_SCAN_COUNT	15
+
+#define STMPE_KEYPAD_MAX_ROWS		8
+#define STMPE_KEYPAD_MAX_COLS		8
+#define STMPE_KEYPAD_ROW_SHIFT		3
+#define STMPE_KEYPAD_KEYMAP_MAX_SIZE \
+	(STMPE_KEYPAD_MAX_ROWS * STMPE_KEYPAD_MAX_COLS)
+
+/**
+ * struct stmpe_keypad_variant - model-specific attributes
+ * @auto_increment: whether the KPC_DATA_BYTE register address
+ *		    auto-increments on multiple read
+ * @set_pullup: whether the pins need to have their pull-ups set
+ * @num_data: number of data bytes
+ * @num_normal_data: number of normal keys' data bytes
+ * @max_cols: maximum number of columns supported
+ * @max_rows: maximum number of rows supported
+ * @col_gpios: bitmask of gpios which can be used for columns
+ * @row_gpios: bitmask of gpios which can be used for rows
+ */
+struct stmpe_keypad_variant {
+	bool		auto_increment;
+	bool		set_pullup;
+	int		num_data;
+	int		num_normal_data;
+	int		max_cols;
+	int		max_rows;
+	unsigned int	col_gpios;
+	unsigned int	row_gpios;
+};
+
+static const struct stmpe_keypad_variant stmpe_keypad_variants[] = {
+	[STMPE1601] = {
+		.auto_increment		= true,
+		.num_data		= 5,
+		.num_normal_data	= 3,
+		.max_cols		= 8,
+		.max_rows		= 8,
+		.col_gpios		= 0x000ff,	/* GPIO 0 - 7 */
+		.row_gpios		= 0x0ff00,	/* GPIO 8 - 15 */
+	},
+	[STMPE2401] = {
+		.auto_increment		= false,
+		.set_pullup		= true,
+		.num_data		= 3,
+		.num_normal_data	= 2,
+		.max_cols		= 8,
+		.max_rows		= 12,
+		.col_gpios		= 0x0000ff,	/* GPIO 0 - 7*/
+		.row_gpios		= 0x1f7f00,	/* GPIO 8-14, 16-20 */
+	},
+	[STMPE2403] = {
+		.auto_increment		= true,
+		.set_pullup		= true,
+		.num_data		= 5,
+		.num_normal_data	= 3,
+		.max_cols		= 8,
+		.max_rows		= 12,
+		.col_gpios		= 0x0000ff,	/* GPIO 0 - 7*/
+		.row_gpios		= 0x1fef00,	/* GPIO 8-14, 16-20 */
+	},
+};
+
+/**
+ * struct stmpe_keypad - STMPE keypad state container
+ * @stmpe: pointer to parent STMPE device
+ * @input: spawned input device
+ * @variant: STMPE variant
+ * @debounce_ms: debounce interval, in ms.  Maximum is
+ *		 %STMPE_KEYPAD_MAX_DEBOUNCE.
+ * @scan_count: number of key scanning cycles to confirm key data.
+ *		Maximum is %STMPE_KEYPAD_MAX_SCAN_COUNT.
+ * @no_autorepeat: disable key autorepeat
+ * @rows: bitmask for the rows
+ * @cols: bitmask for the columns
+ * @keymap: the keymap
+ */
+struct stmpe_keypad {
+	struct stmpe *stmpe;
+	struct input_dev *input;
+	const struct stmpe_keypad_variant *variant;
+	unsigned int debounce_ms;
+	unsigned int scan_count;
+	bool no_autorepeat;
+	unsigned int rows;
+	unsigned int cols;
+	unsigned short keymap[STMPE_KEYPAD_KEYMAP_MAX_SIZE];
+};
+
+static int stmpe_keypad_read_data(struct stmpe_keypad *keypad, u8 *data)
+{
+	const struct stmpe_keypad_variant *variant = keypad->variant;
+	struct stmpe *stmpe = keypad->stmpe;
+	int ret;
+	int i;
+
+	if (variant->auto_increment)
+		return stmpe_block_read(stmpe, STMPE_KPC_DATA_BYTE0,
+					variant->num_data, data);
+
+	for (i = 0; i < variant->num_data; i++) {
+		ret = stmpe_reg_read(stmpe, STMPE_KPC_DATA_BYTE0 + i);
+		if (ret < 0)
+			return ret;
+
+		data[i] = ret;
+	}
+
+	return 0;
+}
+
+static irqreturn_t stmpe_keypad_irq(int irq, void *dev)
+{
+	struct stmpe_keypad *keypad = dev;
+	struct input_dev *input = keypad->input;
+	const struct stmpe_keypad_variant *variant = keypad->variant;
+	u8 fifo[variant->num_data];
+	int ret;
+	int i;
+
+	ret = stmpe_keypad_read_data(keypad, fifo);
+	if (ret < 0)
+		return IRQ_NONE;
+
+	for (i = 0; i < variant->num_normal_data; i++) {
+		u8 data = fifo[i];
+		int row = (data & STMPE_KPC_DATA_ROW) >> 3;
+		int col = data & STMPE_KPC_DATA_COL;
+		int code = MATRIX_SCAN_CODE(row, col, STMPE_KEYPAD_ROW_SHIFT);
+		bool up = data & STMPE_KPC_DATA_UP;
+
+		if ((data & STMPE_KPC_DATA_NOKEY_MASK)
+			== STMPE_KPC_DATA_NOKEY_MASK)
+			continue;
+
+		input_event(input, EV_MSC, MSC_SCAN, code);
+		input_report_key(input, keypad->keymap[code], !up);
+		input_sync(input);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int stmpe_keypad_altfunc_init(struct stmpe_keypad *keypad)
+{
+	const struct stmpe_keypad_variant *variant = keypad->variant;
+	unsigned int col_gpios = variant->col_gpios;
+	unsigned int row_gpios = variant->row_gpios;
+	struct stmpe *stmpe = keypad->stmpe;
+	u8 pureg = stmpe->regs[STMPE_IDX_GPPUR_LSB];
+	unsigned int pins = 0;
+	unsigned int pu_pins = 0;
+	int ret;
+	int i;
+
+	/*
+	 * Figure out which pins need to be set to the keypad alternate
+	 * function.
+	 *
+	 * {cols,rows}_gpios are bitmasks of which pins on the chip can be used
+	 * for the keypad.
+	 *
+	 * keypad->{cols,rows} are a bitmask of which pins (of the ones useable
+	 * for the keypad) are used on the board.
+	 */
+
+	for (i = 0; i < variant->max_cols; i++) {
+		int num = __ffs(col_gpios);
+
+		if (keypad->cols & (1 << i)) {
+			pins |= 1 << num;
+			pu_pins |= 1 << num;
+		}
+
+		col_gpios &= ~(1 << num);
+	}
+
+	for (i = 0; i < variant->max_rows; i++) {
+		int num = __ffs(row_gpios);
+
+		if (keypad->rows & (1 << i))
+			pins |= 1 << num;
+
+		row_gpios &= ~(1 << num);
+	}
+
+	ret = stmpe_set_altfunc(stmpe, pins, STMPE_BLOCK_KEYPAD);
+	if (ret)
+		return ret;
+
+	/*
+	 * On STMPE24xx, set pin bias to pull-up on all keypad input
+	 * pins (columns), this incidentally happen to be maximum 8 pins
+	 * and placed at GPIO0-7 so only the LSB of the pull up register
+	 * ever needs to be written.
+	 */
+	if (variant->set_pullup) {
+		u8 val;
+
+		ret = stmpe_reg_read(stmpe, pureg);
+		if (ret)
+			return ret;
+
+		/* Do not touch unused pins, may be used for GPIO */
+		val = ret & ~pu_pins;
+		val |= pu_pins;
+
+		ret = stmpe_reg_write(stmpe, pureg, val);
+	}
+
+	return 0;
+}
+
+static int stmpe_keypad_chip_init(struct stmpe_keypad *keypad)
+{
+	const struct stmpe_keypad_variant *variant = keypad->variant;
+	struct stmpe *stmpe = keypad->stmpe;
+	int ret;
+
+	if (keypad->debounce_ms > STMPE_KEYPAD_MAX_DEBOUNCE)
+		return -EINVAL;
+
+	if (keypad->scan_count > STMPE_KEYPAD_MAX_SCAN_COUNT)
+		return -EINVAL;
+
+	ret = stmpe_enable(stmpe, STMPE_BLOCK_KEYPAD);
+	if (ret < 0)
+		return ret;
+
+	ret = stmpe_keypad_altfunc_init(keypad);
+	if (ret < 0)
+		return ret;
+
+	ret = stmpe_reg_write(stmpe, STMPE_KPC_COL, keypad->cols);
+	if (ret < 0)
+		return ret;
+
+	ret = stmpe_reg_write(stmpe, STMPE_KPC_ROW_LSB, keypad->rows);
+	if (ret < 0)
+		return ret;
+
+	if (variant->max_rows > 8) {
+		ret = stmpe_set_bits(stmpe, STMPE_KPC_ROW_MSB,
+				     STMPE_KPC_ROW_MSB_ROWS,
+				     keypad->rows >> 8);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = stmpe_set_bits(stmpe, STMPE_KPC_CTRL_MSB,
+			     STMPE_KPC_CTRL_MSB_SCAN_COUNT,
+			     keypad->scan_count << 4);
+	if (ret < 0)
+		return ret;
+
+	return stmpe_set_bits(stmpe, STMPE_KPC_CTRL_LSB,
+			      STMPE_KPC_CTRL_LSB_SCAN |
+			      STMPE_KPC_CTRL_LSB_DEBOUNCE,
+			      STMPE_KPC_CTRL_LSB_SCAN |
+			      (keypad->debounce_ms << 1));
+}
+
+static void stmpe_keypad_fill_used_pins(struct stmpe_keypad *keypad,
+					u32 used_rows, u32 used_cols)
+{
+	int row, col;
+
+	for (row = 0; row < used_rows; row++) {
+		for (col = 0; col < used_cols; col++) {
+			int code = MATRIX_SCAN_CODE(row, col,
+						    STMPE_KEYPAD_ROW_SHIFT);
+			if (keypad->keymap[code] != KEY_RESERVED) {
+				keypad->rows |= 1 << row;
+				keypad->cols |= 1 << col;
+			}
+		}
+	}
+}
+
+static int stmpe_keypad_probe(struct platform_device *pdev)
+{
+	struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
+	struct device_node *np = pdev->dev.of_node;
+	struct stmpe_keypad *keypad;
+	struct input_dev *input;
+	u32 rows;
+	u32 cols;
+	int error;
+	int irq;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	keypad = devm_kzalloc(&pdev->dev, sizeof(struct stmpe_keypad),
+			      GFP_KERNEL);
+	if (!keypad)
+		return -ENOMEM;
+
+	keypad->stmpe = stmpe;
+	keypad->variant = &stmpe_keypad_variants[stmpe->partnum];
+
+	of_property_read_u32(np, "debounce-interval", &keypad->debounce_ms);
+	of_property_read_u32(np, "st,scan-count", &keypad->scan_count);
+	keypad->no_autorepeat = of_property_read_bool(np, "st,no-autorepeat");
+
+	input = devm_input_allocate_device(&pdev->dev);
+	if (!input)
+		return -ENOMEM;
+
+	input->name = "STMPE keypad";
+	input->id.bustype = BUS_I2C;
+	input->dev.parent = &pdev->dev;
+
+	error = matrix_keypad_parse_of_params(&pdev->dev, &rows, &cols);
+	if (error)
+		return error;
+
+	error = matrix_keypad_build_keymap(NULL, NULL, rows, cols,
+					   keypad->keymap, input);
+	if (error)
+		return error;
+
+	input_set_capability(input, EV_MSC, MSC_SCAN);
+	if (!keypad->no_autorepeat)
+		__set_bit(EV_REP, input->evbit);
+
+	stmpe_keypad_fill_used_pins(keypad, rows, cols);
+
+	keypad->input = input;
+
+	error = stmpe_keypad_chip_init(keypad);
+	if (error < 0)
+		return error;
+
+	error = devm_request_threaded_irq(&pdev->dev, irq,
+					  NULL, stmpe_keypad_irq,
+					  IRQF_ONESHOT, "stmpe-keypad", keypad);
+	if (error) {
+		dev_err(&pdev->dev, "unable to get irq: %d\n", error);
+		return error;
+	}
+
+	error = input_register_device(input);
+	if (error) {
+		dev_err(&pdev->dev,
+			"unable to register input device: %d\n", error);
+		return error;
+	}
+
+	platform_set_drvdata(pdev, keypad);
+
+	return 0;
+}
+
+static int stmpe_keypad_remove(struct platform_device *pdev)
+{
+	struct stmpe_keypad *keypad = platform_get_drvdata(pdev);
+
+	stmpe_disable(keypad->stmpe, STMPE_BLOCK_KEYPAD);
+
+	return 0;
+}
+
+static struct platform_driver stmpe_keypad_driver = {
+	.driver.name	= "stmpe-keypad",
+	.driver.owner	= THIS_MODULE,
+	.probe		= stmpe_keypad_probe,
+	.remove		= stmpe_keypad_remove,
+};
+module_platform_driver(stmpe_keypad_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("STMPExxxx keypad driver");
+MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");