input: Add STMPE keypad driver (76f10845) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/input/keyboard/Kconfig

+10 −0

Original line number	Diff line number	Diff line
		@@ -395,6 +395,16 @@ config KEYBOARD_SH_KEYSC
		To compile this driver as a module, choose M here: the
		module will be called sh_keysc.

		config KEYBOARD_STMPE
		tristate "STMPE keypad support"
		depends on MFD_STMPE
		help
		Say Y here if you want to use the keypad controller on STMPE I/O
		expanders.

		To compile this driver as a module, choose M here: the module will be
		called stmpe-keypad.

		config KEYBOARD_DAVINCI
		tristate "TI DaVinci Key Scan"
		depends on ARCH_DAVINCI_DM365

drivers/input/keyboard/Makefile

+1 −0

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		@@ -35,6 +35,7 @@ obj-$(CONFIG_KEYBOARD_PXA930_ROTARY) += pxa930_rotary.o
		obj-$(CONFIG_KEYBOARD_QT2160) += qt2160.o
		obj-$(CONFIG_KEYBOARD_SAMSUNG) += samsung-keypad.o
		obj-$(CONFIG_KEYBOARD_SH_KEYSC) += sh_keysc.o
		obj-$(CONFIG_KEYBOARD_STMPE) += stmpe-keypad.o
		obj-$(CONFIG_KEYBOARD_STOWAWAY) += stowaway.o
		obj-$(CONFIG_KEYBOARD_SUNKBD) += sunkbd.o
		obj-$(CONFIG_KEYBOARD_TWL4030) += twl4030_keypad.o

drivers/input/keyboard/stmpe-keypad.c

0 → 100644

+386 −0

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		/*
		* 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/init.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_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
		* @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;
		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,
		.num_data = 3,
		.num_normal_data = 2,
		.max_cols = 8,
		.max_rows = 12,
		.col_gpios = 0x0000ff, /* GPIO 0 - 7*/
		.row_gpios = 0x1fef00, /* GPIO 8-14, 16-20 */
		},
		[STMPE2403] = {
		.auto_increment = 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 {
		struct stmpe *stmpe;
		struct input_dev *input;
		const struct stmpe_keypad_variant *variant;
		const struct stmpe_keypad_platform_data *plat;

		unsigned int rows;
		unsigned int cols;

		unsigned short keymap[STMPE_KEYPAD_KEYMAP_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 __devinit 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;
		unsigned int pins = 0;
		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;

		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);
		}

		return stmpe_set_altfunc(stmpe, pins, STMPE_BLOCK_KEYPAD);
		}

		static int __devinit stmpe_keypad_chip_init(struct stmpe_keypad *keypad)
		{
		const struct stmpe_keypad_platform_data *plat = keypad->plat;
		const struct stmpe_keypad_variant *variant = keypad->variant;
		struct stmpe *stmpe = keypad->stmpe;
		int ret;

		if (plat->debounce_ms > STMPE_KEYPAD_MAX_DEBOUNCE)
		return -EINVAL;

		if (plat->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,
		plat->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 \|
		(plat->debounce_ms << 1));
		}

		static int __devinit stmpe_keypad_probe(struct platform_device *pdev)
		{
		struct stmpe *stmpe = dev_get_drvdata(pdev->dev.parent);
		struct stmpe_keypad_platform_data *plat;
		struct stmpe_keypad *keypad;
		struct input_dev *input;
		int ret;
		int irq;
		int i;

		plat = stmpe->pdata->keypad;
		if (!plat)
		return -ENODEV;

		irq = platform_get_irq(pdev, 0);
		if (irq < 0)
		return irq;

		keypad = kzalloc(sizeof(struct stmpe_keypad), GFP_KERNEL);
		if (!keypad)
		return -ENOMEM;

		input = input_allocate_device();
		if (!input) {
		ret = -ENOMEM;
		goto out_freekeypad;
		}

		input->name = "STMPE keypad";
		input->id.bustype = BUS_I2C;
		input->dev.parent = &pdev->dev;

		input_set_capability(input, EV_MSC, MSC_SCAN);

		__set_bit(EV_KEY, input->evbit);
		if (!plat->no_autorepeat)
		__set_bit(EV_REP, input->evbit);

		input->keycode = keypad->keymap;
		input->keycodesize = sizeof(keypad->keymap[0]);
		input->keycodemax = ARRAY_SIZE(keypad->keymap);

		matrix_keypad_build_keymap(plat->keymap_data, STMPE_KEYPAD_ROW_SHIFT,
		input->keycode, input->keybit);

		for (i = 0; i < plat->keymap_data->keymap_size; i++) {
		unsigned int key = plat->keymap_data->keymap[i];

		keypad->cols \|= 1 << KEY_COL(key);
		keypad->rows \|= 1 << KEY_ROW(key);
		}

		keypad->stmpe = stmpe;
		keypad->plat = plat;
		keypad->input = input;
		keypad->variant = &stmpe_keypad_variants[stmpe->partnum];

		ret = stmpe_keypad_chip_init(keypad);
		if (ret < 0)
		goto out_freeinput;

		ret = input_register_device(input);
		if (ret) {
		dev_err(&pdev->dev,
		"unable to register input device: %d\n", ret);
		goto out_freeinput;
		}

		ret = request_threaded_irq(irq, NULL, stmpe_keypad_irq, IRQF_ONESHOT,
		"stmpe-keypad", keypad);
		if (ret) {
		dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
		goto out_unregisterinput;
		}

		platform_set_drvdata(pdev, keypad);

		return 0;

		out_unregisterinput:
		input_unregister_device(input);
		input = NULL;
		out_freeinput:
		input_free_device(input);
		out_freekeypad:
		kfree(keypad);
		return ret;
		}

		static int __devexit stmpe_keypad_remove(struct platform_device *pdev)
		{
		struct stmpe_keypad *keypad = platform_get_drvdata(pdev);
		struct stmpe *stmpe = keypad->stmpe;
		int irq = platform_get_irq(pdev, 0);

		stmpe_disable(stmpe, STMPE_BLOCK_KEYPAD);

		free_irq(irq, keypad);
		input_unregister_device(keypad->input);
		platform_set_drvdata(pdev, NULL);
		kfree(keypad);

		return 0;
		}

		static struct platform_driver stmpe_keypad_driver = {
		.driver.name = "stmpe-keypad",
		.driver.owner = THIS_MODULE,
		.probe = stmpe_keypad_probe,
		.remove = __devexit_p(stmpe_keypad_remove),
		};

		static int __init stmpe_keypad_init(void)
		{
		return platform_driver_register(&stmpe_keypad_driver);
		}
		module_init(stmpe_keypad_init);

		static void __exit stmpe_keypad_exit(void)
		{
		platform_driver_unregister(&stmpe_keypad_driver);
		}
		module_exit(stmpe_keypad_exit);

		MODULE_LICENSE("GPL v2");
		MODULE_DESCRIPTION("STMPExxxx keypad driver");
		MODULE_AUTHOR("Rabin Vincent <rabin.vincent@stericsson.com>");