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SubjectInput: add MAX7359 key switch controller driver
The Maxim MAX7359 is a I2C interfaced key switch controller which provides microprocessors with management of up to 64 key switches.
This patch adds support for the MAX7359 key switch controller.

Signed-off-by: Kim Kyuwon <q1.kim@samsung.com>
---
drivers/input/keyboard/Kconfig | 8 +
drivers/input/keyboard/Makefile | 1 +
drivers/input/keyboard/max7359_keypad.c | 300 +++++++++++++++++++++++++++++++
include/linux/max7359_keypad.h | 30 +++
4 files changed, 339 insertions(+), 0 deletions(-)
create mode 100644 drivers/input/keyboard/max7359_keypad.c
create mode 100644 include/linux/max7359_keypad.h

diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index ea2638b..fb2dc08 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -332,4 +332,12 @@ config KEYBOARD_SH_KEYSC

To compile this driver as a module, choose M here: the
module will be called sh_keysc.
+
+config KEYBOARD_MAX7359
+ tristate "Maxim MAX7359 Key Switch Controller"
+ depends on I2C
+ help
+ If you say yes here you get support for the Maxim MAX7359 Key
+ Switch Controller chip. This providers microprocessors with
+ management of up to 64 key switches
endif
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 36351e1..a9e7502 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -28,3 +28,4 @@ obj-$(CONFIG_KEYBOARD_HP7XX) += jornada720_kbd.o
obj-$(CONFIG_KEYBOARD_MAPLE) += maple_keyb.o
obj-$(CONFIG_KEYBOARD_BFIN) += bf54x-keys.o
obj-$(CONFIG_KEYBOARD_SH_KEYSC) += sh_keysc.o
+obj-$(CONFIG_KEYBOARD_MAX7359) += max7359_keypad.o
diff --git a/drivers/input/keyboard/max7359_keypad.c b/drivers/input/keyboard/max7359_keypad.c
new file mode 100644
index 0000000..3c2ec01
--- /dev/null
+++ b/drivers/input/keyboard/max7359_keypad.c
@@ -0,0 +1,300 @@
+/*
+ * max7359_keypad.c - MAX7359 Key Switch Controller Driver
+ *
+ * Copyright (C) 2009 Samsung Electronics
+ * Kim Kyuwon <q1.kim@samsung.com>
+ *
+ * Based on pxa27x_keypad.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Datasheet: http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5456
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/max7359_keypad.h>
+
+#define MAX_KEY_NUM (8 * 8)
+
+/*
+ * MAX7359 registers
+ */
+#define MAX7359_REG_KEYFIFO 0x00
+#define MAX7359_REG_CONFIG 0x01
+#define MAX7359_REG_DEBOUNCE 0x02
+#define MAX7359_REG_INTERRUPT 0x03
+#define MAX7359_REG_PORTS 0x04
+#define MAX7359_REG_KEYREP 0x05
+#define MAX7359_REG_SLEEP 0x06
+
+/*
+ * Configuration register bits
+ */
+#define MAX7359_CFG_SLEEP (1 << 7)
+#define MAX7359_CFG_INTERRUPT (1 << 5)
+#define MAX7359_CFG_KEY_RELEASE (1 << 3)
+#define MAX7359_CFG_WAKEUP (1 << 1)
+#define MAX7359_CFG_TIMEOUT (1 << 0)
+
+struct max7359_keypad {
+ /* matrix key code map */
+ u16 keycodes[MAX_KEY_NUM];
+
+ struct work_struct work;
+
+ struct max7359_keypad_platform_data *pdata;
+ struct input_dev *input_dev;
+ struct i2c_client *client;
+
+ u32 irq;
+};
+
+static int max7359_write_reg(struct i2c_client *client, u8 reg, u8 val)
+{
+ int ret = i2c_smbus_write_byte_data(client, reg, val);
+ if (ret >= 0)
+ return 0;
+
+ dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
+ __func__, reg, val, ret);
+
+ return ret;
+}
+
+static int max7359_read_reg(struct i2c_client *client, int reg)
+{
+ int ret = i2c_smbus_read_byte_data(client, reg);
+ if (ret < 0)
+ dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
+ __func__, reg, ret);
+ return ret;
+}
+
+static void max7359_build_keycode(struct max7359_keypad *keypad)
+{
+ struct max7359_keypad_platform_data *pdata = keypad->pdata;
+ struct input_dev *input_dev = keypad->input_dev;
+ unsigned int *key;
+ int i;
+
+ key = pdata->key_map;
+ for (i = 0; i < pdata->key_map_size; i++, key++) {
+ int row = ((*key) >> 28) & 0xf;
+ int col = ((*key) >> 24) & 0xf;
+ short code = (*key) & 0xffff;
+
+ keypad->keycodes[(row << 3) + col] = code;
+ set_bit(code, input_dev->keybit);
+ }
+}
+
+static inline unsigned int max7359_lookup_matrix_keycode(
+ struct max7359_keypad *keypad, int row, int col)
+{
+ return keypad->keycodes[(row << 3) + col];
+}
+
+static void max7359_worker(struct work_struct *work)
+{
+ struct max7359_keypad *keypad =
+ container_of(work, struct max7359_keypad, work);
+ int val, row, col, release;
+
+ val = max7359_read_reg(keypad->client, MAX7359_REG_KEYFIFO);
+ row = val & 0x7;
+ col = (val >> 3) & 0x7;
+ release = val & 0x40;
+
+ input_report_key(keypad->input_dev,
+ max7359_lookup_matrix_keycode(keypad, row, col), !release);
+ input_sync(keypad->input_dev);
+
+ enable_irq(keypad->irq);
+
+ dev_dbg(&keypad->client->dev, "key[%d:%d] %s\n", row, col,
+ (release ? "release" : "press"));
+}
+
+static irqreturn_t max7359_interrupt(int irq, void *dev_id)
+{
+ struct max7359_keypad *keypad = (struct max7359_keypad *) dev_id;
+
+ if (!work_pending(&keypad->work)) {
+ disable_irq_nosync(keypad->irq);
+ schedule_work(&keypad->work);
+ } else {
+ dev_err(&keypad->client->dev,
+ "Another job is currently pending \n");
+ }
+
+ return IRQ_HANDLED;
+}
+
+static void max7359_initialize(struct i2c_client *client)
+{
+ max7359_write_reg(client, MAX7359_REG_CONFIG,
+ MAX7359_CFG_INTERRUPT | /* Irq clears after host read */
+ MAX7359_CFG_KEY_RELEASE | /* Key release enable */
+ MAX7359_CFG_WAKEUP); /* Key press wakeup enable */
+
+ /* Full key-scan functionality */
+ max7359_write_reg(client, MAX7359_REG_DEBOUNCE, 0x1F);
+
+ /* nINT asserts every debounce cycles */
+ max7359_write_reg(client, MAX7359_REG_INTERRUPT, 0x01);
+}
+
+static int __devinit max7359_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct max7359_keypad *keypad;
+ struct max7359_keypad_platform_data *pdata;
+ struct input_dev *input_dev;
+ int ret;
+
+ keypad = kzalloc(sizeof(struct max7359_keypad), GFP_KERNEL);
+ if (keypad == NULL) {
+ dev_err(&client->dev, "failed to allocate driver data\n");
+ return -ENOMEM;
+ }
+
+ keypad->client = client;
+ pdata = keypad->pdata = client->dev.platform_data;
+ i2c_set_clientdata(client, keypad);
+
+ /* Detect MAX7359: The initial Keys FIFO value is '0x3F' */
+ ret = max7359_read_reg(client, MAX7359_REG_KEYFIFO);
+ if (ret < 0) {
+ dev_err(&client->dev, "failed to detect device\n");
+ goto failed_free;
+ } else {
+ dev_info(&client->dev, "keys FIFO is 0x%02x"
+ ", succeeded in detecting device\n", ret);
+ }
+
+ /* Initialize MAX7359 */
+ max7359_initialize(client);
+
+ /* Create and register the input driver. */
+ input_dev = input_allocate_device();
+ if (!input_dev) {
+ dev_err(&client->dev, "failed to allocate input device\n");
+ ret = -ENOMEM;
+ goto failed_free;
+ }
+
+ input_dev->name = client->name;
+ input_dev->id.bustype = BUS_I2C;
+ input_dev->dev.parent = &client->dev;
+
+ input_set_drvdata(input_dev, keypad);
+
+ input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
+ input_dev->keycodesize = sizeof(keypad->keycodes[0]);
+ input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
+ input_dev->keycode = keypad->keycodes;
+
+ keypad->input_dev = input_dev;
+
+ max7359_build_keycode(keypad);
+
+ INIT_WORK(&keypad->work, max7359_worker);
+
+ keypad->irq = client->irq;
+ if (!keypad->irq) {
+ dev_err(&client->dev, "The irq number should not be zero\n");
+ goto failed_free_dev;
+ }
+
+ ret = request_irq(keypad->irq, max7359_interrupt,
+ IRQF_TRIGGER_LOW, client->name, keypad);
+ if (ret) {
+ dev_err(&client->dev, "failed to register interrupt\n");
+ goto failed_free_dev;
+ }
+
+ /* Register the input device */
+ ret = input_register_device(input_dev);
+ if (ret) {
+ dev_err(&client->dev, "failed to register input device\n");
+ goto failed_free_irq;
+ }
+
+ return 0;
+
+failed_free_irq:
+ free_irq(keypad->irq, keypad);
+failed_free_dev:
+ input_free_device(input_dev);
+failed_free:
+ i2c_set_clientdata(client, NULL);
+ kfree(keypad);
+ return ret;
+}
+
+static int __exit max7359_remove(struct i2c_client *client)
+{
+ struct max7359_keypad *keypad = i2c_get_clientdata(client);
+
+ cancel_work_sync(&keypad->work);
+ input_unregister_device(keypad->input_dev);
+ free_irq(keypad->irq, keypad);
+ i2c_set_clientdata(client, NULL);
+ kfree(keypad);
+
+ return 0;
+}
+
+static int max7359_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+ /* If no keys are pressed, enter sleep mode for 8192 ms */
+ max7359_write_reg(client, MAX7359_REG_SLEEP, 0x01);
+
+ return 0;
+}
+
+static int max7359_resume(struct i2c_client *client)
+{
+ /* Restore the default setting (autosleep for 256 ms) */
+ max7359_write_reg(client, MAX7359_REG_SLEEP, 0x07);
+
+ return 0;
+}
+
+static const struct i2c_device_id max7359_ids[] = {
+ { "max7359", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, max7359_ids);
+
+static struct i2c_driver max7359_i2c_driver = {
+ .driver = {
+ .name = "max7359",
+ },
+ .probe = max7359_probe,
+ .remove = __exit_p(max7359_remove),
+ .suspend = max7359_suspend,
+ .resume = max7359_resume,
+ .id_table = max7359_ids,
+};
+
+static int __init max7359_init(void)
+{
+ return i2c_add_driver(&max7359_i2c_driver);
+}
+module_init(max7359_init);
+
+static void __exit max7359_exit(void)
+{
+ i2c_del_driver(&max7359_i2c_driver);
+}
+module_exit(max7359_exit);
+
+MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
+MODULE_DESCRIPTION("MAX7359 Key Switch Controller Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/max7359_keypad.h b/include/linux/max7359_keypad.h
new file mode 100644
index 0000000..c9477a5
--- /dev/null
+++ b/include/linux/max7359_keypad.h
@@ -0,0 +1,30 @@
+/*
+ * max7359_keypad.h - MAX7359 Keypad Controller Driver
+ *
+ * Copyright (C) 2009 Samsung Electronics
+ * Kim Kyuwon <q1.kim@samsung.com>
+ *
+ * Based on pxa27x_keypad.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Datasheet: http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5456
+ */
+
+#ifndef _MAX7359_KEYPAD_H_
+#define _MAX7359_KEYPAD_H_
+
+#define MAX_MATRIX_KEY_ROWS 8
+#define MAX_MATRIX_KEY_COLS 8
+
+struct max7359_keypad_platform_data {
+ /* code map for the keys */
+ unsigned int *key_map;
+ unsigned int key_map_size;
+};
+
+#define KEY(row, col, val) (((row) << 28) | ((col) << 24) | (val))
+
+#endif /* _MAX7359_KEYPAD_H_ */
--
1.5.2.5

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