298 lines
7.3 KiB
C
Executable file
298 lines
7.3 KiB
C
Executable file
/*
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* max7359_keypad.c - MAX7359 Key Switch Controller Driver
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*
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* Copyright (C) 2009 Samsung Electronics
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* Kim Kyuwon <q1.kim@samsung.com>
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*
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* Based on pxa27x_keypad.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Datasheet: http://www.maxim-ic.com/quick_view2.cfm/qv_pk/5456
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/pm.h>
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#include <linux/input.h>
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#include <linux/input/matrix_keypad.h>
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#define MAX7359_MAX_KEY_ROWS 8
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#define MAX7359_MAX_KEY_COLS 8
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#define MAX7359_MAX_KEY_NUM (MAX7359_MAX_KEY_ROWS * MAX7359_MAX_KEY_COLS)
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#define MAX7359_ROW_SHIFT 3
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/*
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* MAX7359 registers
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*/
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#define MAX7359_REG_KEYFIFO 0x00
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#define MAX7359_REG_CONFIG 0x01
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#define MAX7359_REG_DEBOUNCE 0x02
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#define MAX7359_REG_INTERRUPT 0x03
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#define MAX7359_REG_PORTS 0x04
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#define MAX7359_REG_KEYREP 0x05
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#define MAX7359_REG_SLEEP 0x06
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/*
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* Configuration register bits
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*/
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#define MAX7359_CFG_SLEEP (1 << 7)
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#define MAX7359_CFG_INTERRUPT (1 << 5)
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#define MAX7359_CFG_KEY_RELEASE (1 << 3)
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#define MAX7359_CFG_WAKEUP (1 << 1)
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#define MAX7359_CFG_TIMEOUT (1 << 0)
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/*
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* Autosleep register values (ms)
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*/
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#define MAX7359_AUTOSLEEP_8192 0x01
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#define MAX7359_AUTOSLEEP_4096 0x02
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#define MAX7359_AUTOSLEEP_2048 0x03
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#define MAX7359_AUTOSLEEP_1024 0x04
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#define MAX7359_AUTOSLEEP_512 0x05
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#define MAX7359_AUTOSLEEP_256 0x06
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struct max7359_keypad {
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/* matrix key code map */
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unsigned short keycodes[MAX7359_MAX_KEY_NUM];
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struct input_dev *input_dev;
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struct i2c_client *client;
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};
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static int max7359_write_reg(struct i2c_client *client, u8 reg, u8 val)
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{
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int ret = i2c_smbus_write_byte_data(client, reg, val);
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if (ret < 0)
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dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
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__func__, reg, val, ret);
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return ret;
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}
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static int max7359_read_reg(struct i2c_client *client, int reg)
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{
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int ret = i2c_smbus_read_byte_data(client, reg);
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if (ret < 0)
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dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
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__func__, reg, ret);
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return ret;
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}
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/* runs in an IRQ thread -- can (and will!) sleep */
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static irqreturn_t max7359_interrupt(int irq, void *dev_id)
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{
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struct max7359_keypad *keypad = dev_id;
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struct input_dev *input_dev = keypad->input_dev;
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int val, row, col, release, code;
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val = max7359_read_reg(keypad->client, MAX7359_REG_KEYFIFO);
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row = val & 0x7;
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col = (val >> 3) & 0x7;
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release = val & 0x40;
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code = MATRIX_SCAN_CODE(row, col, MAX7359_ROW_SHIFT);
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dev_dbg(&keypad->client->dev,
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"key[%d:%d] %s\n", row, col, release ? "release" : "press");
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input_event(input_dev, EV_MSC, MSC_SCAN, code);
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input_report_key(input_dev, keypad->keycodes[code], !release);
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input_sync(input_dev);
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return IRQ_HANDLED;
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}
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/*
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* Let MAX7359 fall into a deep sleep:
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* If no keys are pressed, enter sleep mode for 8192 ms. And if any
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* key is pressed, the MAX7359 returns to normal operating mode.
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*/
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static inline void max7359_fall_deepsleep(struct i2c_client *client)
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{
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max7359_write_reg(client, MAX7359_REG_SLEEP, MAX7359_AUTOSLEEP_8192);
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}
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/*
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* Let MAX7359 take a catnap:
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* Autosleep just for 256 ms.
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*/
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static inline void max7359_take_catnap(struct i2c_client *client)
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{
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max7359_write_reg(client, MAX7359_REG_SLEEP, MAX7359_AUTOSLEEP_256);
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}
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static int max7359_open(struct input_dev *dev)
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{
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struct max7359_keypad *keypad = input_get_drvdata(dev);
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max7359_take_catnap(keypad->client);
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return 0;
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}
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static void max7359_close(struct input_dev *dev)
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{
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struct max7359_keypad *keypad = input_get_drvdata(dev);
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max7359_fall_deepsleep(keypad->client);
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}
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static void max7359_initialize(struct i2c_client *client)
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{
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max7359_write_reg(client, MAX7359_REG_CONFIG,
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MAX7359_CFG_KEY_RELEASE | /* Key release enable */
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MAX7359_CFG_WAKEUP); /* Key press wakeup enable */
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/* Full key-scan functionality */
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max7359_write_reg(client, MAX7359_REG_DEBOUNCE, 0x1F);
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/* nINT asserts every debounce cycles */
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max7359_write_reg(client, MAX7359_REG_INTERRUPT, 0x01);
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max7359_fall_deepsleep(client);
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}
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static int max7359_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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const struct matrix_keymap_data *keymap_data =
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dev_get_platdata(&client->dev);
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struct max7359_keypad *keypad;
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struct input_dev *input_dev;
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int ret;
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int error;
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if (!client->irq) {
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dev_err(&client->dev, "The irq number should not be zero\n");
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return -EINVAL;
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}
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/* Detect MAX7359: The initial Keys FIFO value is '0x3F' */
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ret = max7359_read_reg(client, MAX7359_REG_KEYFIFO);
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if (ret < 0) {
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dev_err(&client->dev, "failed to detect device\n");
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return -ENODEV;
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}
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dev_dbg(&client->dev, "keys FIFO is 0x%02x\n", ret);
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keypad = devm_kzalloc(&client->dev, sizeof(struct max7359_keypad),
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GFP_KERNEL);
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if (!keypad) {
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dev_err(&client->dev, "failed to allocate memory\n");
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return -ENOMEM;
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}
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input_dev = devm_input_allocate_device(&client->dev);
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if (!input_dev) {
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dev_err(&client->dev, "failed to allocate input device\n");
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return -ENOMEM;
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}
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keypad->client = client;
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keypad->input_dev = input_dev;
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input_dev->name = client->name;
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input_dev->id.bustype = BUS_I2C;
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input_dev->open = max7359_open;
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input_dev->close = max7359_close;
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input_dev->dev.parent = &client->dev;
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input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
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input_dev->keycodesize = sizeof(keypad->keycodes[0]);
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input_dev->keycodemax = ARRAY_SIZE(keypad->keycodes);
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input_dev->keycode = keypad->keycodes;
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input_set_capability(input_dev, EV_MSC, MSC_SCAN);
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input_set_drvdata(input_dev, keypad);
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error = matrix_keypad_build_keymap(keymap_data, NULL,
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MAX7359_MAX_KEY_ROWS,
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MAX7359_MAX_KEY_COLS,
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keypad->keycodes,
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input_dev);
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if (error) {
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dev_err(&client->dev, "failed to build keymap\n");
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return error;
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}
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error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
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max7359_interrupt,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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client->name, keypad);
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if (error) {
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dev_err(&client->dev, "failed to register interrupt\n");
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return error;
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}
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/* Register the input device */
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error = input_register_device(input_dev);
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if (error) {
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dev_err(&client->dev, "failed to register input device\n");
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return error;
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}
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/* Initialize MAX7359 */
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max7359_initialize(client);
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device_init_wakeup(&client->dev, 1);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int max7359_suspend(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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max7359_fall_deepsleep(client);
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if (device_may_wakeup(&client->dev))
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enable_irq_wake(client->irq);
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return 0;
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}
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static int max7359_resume(struct device *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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if (device_may_wakeup(&client->dev))
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disable_irq_wake(client->irq);
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/* Restore the default setting */
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max7359_take_catnap(client);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(max7359_pm, max7359_suspend, max7359_resume);
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static const struct i2c_device_id max7359_ids[] = {
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{ "max7359", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, max7359_ids);
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static struct i2c_driver max7359_i2c_driver = {
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.driver = {
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.name = "max7359",
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.pm = &max7359_pm,
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},
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.probe = max7359_probe,
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.id_table = max7359_ids,
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};
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module_i2c_driver(max7359_i2c_driver);
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MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
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MODULE_DESCRIPTION("MAX7359 Key Switch Controller Driver");
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MODULE_LICENSE("GPL v2");
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