282 lines
7.0 KiB
C
282 lines
7.0 KiB
C
/*
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* Touchkey driver for MELFAS MCS5000/5080 controller
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*
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* Copyright (C) 2010 Samsung Electronics Co.Ltd
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* Author: HeungJun Kim <riverful.kim@samsung.com>
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* Author: Joonyoung Shim <jy0922.shim@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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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/interrupt.h>
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#include <linux/input.h>
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#include <linux/irq.h>
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#include <linux/slab.h>
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#include <linux/platform_data/mcs.h>
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#include <linux/pm.h>
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/* MCS5000 Touchkey */
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#define MCS5000_TOUCHKEY_STATUS 0x04
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#define MCS5000_TOUCHKEY_STATUS_PRESS 7
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#define MCS5000_TOUCHKEY_FW 0x0a
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#define MCS5000_TOUCHKEY_BASE_VAL 0x61
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/* MCS5080 Touchkey */
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#define MCS5080_TOUCHKEY_STATUS 0x00
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#define MCS5080_TOUCHKEY_STATUS_PRESS 3
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#define MCS5080_TOUCHKEY_FW 0x01
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#define MCS5080_TOUCHKEY_BASE_VAL 0x1
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enum mcs_touchkey_type {
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MCS5000_TOUCHKEY,
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MCS5080_TOUCHKEY,
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};
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struct mcs_touchkey_chip {
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unsigned int status_reg;
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unsigned int pressbit;
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unsigned int press_invert;
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unsigned int baseval;
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};
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struct mcs_touchkey_data {
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void (*poweron)(bool);
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struct i2c_client *client;
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struct input_dev *input_dev;
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struct mcs_touchkey_chip chip;
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unsigned int key_code;
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unsigned int key_val;
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unsigned short keycodes[];
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};
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static irqreturn_t mcs_touchkey_interrupt(int irq, void *dev_id)
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{
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struct mcs_touchkey_data *data = dev_id;
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struct mcs_touchkey_chip *chip = &data->chip;
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struct i2c_client *client = data->client;
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struct input_dev *input = data->input_dev;
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unsigned int key_val;
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unsigned int pressed;
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int val;
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val = i2c_smbus_read_byte_data(client, chip->status_reg);
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if (val < 0) {
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dev_err(&client->dev, "i2c read error [%d]\n", val);
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goto out;
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}
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pressed = (val & (1 << chip->pressbit)) >> chip->pressbit;
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if (chip->press_invert)
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pressed ^= chip->press_invert;
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/* key_val is 0 when released, so we should use key_val of press. */
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if (pressed) {
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key_val = val & (0xff >> (8 - chip->pressbit));
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if (!key_val)
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goto out;
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key_val -= chip->baseval;
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data->key_code = data->keycodes[key_val];
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data->key_val = key_val;
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}
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input_event(input, EV_MSC, MSC_SCAN, data->key_val);
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input_report_key(input, data->key_code, pressed);
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input_sync(input);
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dev_dbg(&client->dev, "key %d %d %s\n", data->key_val, data->key_code,
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pressed ? "pressed" : "released");
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out:
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return IRQ_HANDLED;
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}
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static int mcs_touchkey_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 mcs_platform_data *pdata;
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struct mcs_touchkey_data *data;
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struct input_dev *input_dev;
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unsigned int fw_reg;
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int fw_ver;
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int error;
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int i;
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pdata = dev_get_platdata(&client->dev);
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if (!pdata) {
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dev_err(&client->dev, "no platform data defined\n");
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return -EINVAL;
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}
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data = kzalloc(struct_size(data, keycodes, pdata->key_maxval + 1),
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GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!data || !input_dev) {
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dev_err(&client->dev, "Failed to allocate memory\n");
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error = -ENOMEM;
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goto err_free_mem;
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}
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data->client = client;
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data->input_dev = input_dev;
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if (id->driver_data == MCS5000_TOUCHKEY) {
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data->chip.status_reg = MCS5000_TOUCHKEY_STATUS;
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data->chip.pressbit = MCS5000_TOUCHKEY_STATUS_PRESS;
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data->chip.baseval = MCS5000_TOUCHKEY_BASE_VAL;
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fw_reg = MCS5000_TOUCHKEY_FW;
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} else {
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data->chip.status_reg = MCS5080_TOUCHKEY_STATUS;
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data->chip.pressbit = MCS5080_TOUCHKEY_STATUS_PRESS;
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data->chip.press_invert = 1;
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data->chip.baseval = MCS5080_TOUCHKEY_BASE_VAL;
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fw_reg = MCS5080_TOUCHKEY_FW;
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}
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fw_ver = i2c_smbus_read_byte_data(client, fw_reg);
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if (fw_ver < 0) {
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error = fw_ver;
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dev_err(&client->dev, "i2c read error[%d]\n", error);
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goto err_free_mem;
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}
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dev_info(&client->dev, "Firmware version: %d\n", fw_ver);
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input_dev->name = "MELFAS MCS Touchkey";
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input_dev->id.bustype = BUS_I2C;
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input_dev->dev.parent = &client->dev;
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input_dev->evbit[0] = BIT_MASK(EV_KEY);
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if (!pdata->no_autorepeat)
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input_dev->evbit[0] |= BIT_MASK(EV_REP);
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input_dev->keycode = data->keycodes;
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input_dev->keycodesize = sizeof(data->keycodes[0]);
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input_dev->keycodemax = pdata->key_maxval + 1;
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for (i = 0; i < pdata->keymap_size; i++) {
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unsigned int val = MCS_KEY_VAL(pdata->keymap[i]);
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unsigned int code = MCS_KEY_CODE(pdata->keymap[i]);
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data->keycodes[val] = code;
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__set_bit(code, input_dev->keybit);
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}
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input_set_capability(input_dev, EV_MSC, MSC_SCAN);
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input_set_drvdata(input_dev, data);
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if (pdata->cfg_pin)
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pdata->cfg_pin();
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if (pdata->poweron) {
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data->poweron = pdata->poweron;
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data->poweron(true);
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}
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error = request_threaded_irq(client->irq, NULL, mcs_touchkey_interrupt,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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client->dev.driver->name, data);
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if (error) {
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dev_err(&client->dev, "Failed to register interrupt\n");
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goto err_free_mem;
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}
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error = input_register_device(input_dev);
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if (error)
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goto err_free_irq;
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i2c_set_clientdata(client, data);
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return 0;
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err_free_irq:
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free_irq(client->irq, data);
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err_free_mem:
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input_free_device(input_dev);
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kfree(data);
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return error;
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}
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static int mcs_touchkey_remove(struct i2c_client *client)
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{
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struct mcs_touchkey_data *data = i2c_get_clientdata(client);
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free_irq(client->irq, data);
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if (data->poweron)
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data->poweron(false);
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input_unregister_device(data->input_dev);
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kfree(data);
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return 0;
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}
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static void mcs_touchkey_shutdown(struct i2c_client *client)
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{
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struct mcs_touchkey_data *data = i2c_get_clientdata(client);
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if (data->poweron)
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data->poweron(false);
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}
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#ifdef CONFIG_PM_SLEEP
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static int mcs_touchkey_suspend(struct device *dev)
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{
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struct mcs_touchkey_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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/* Disable the work */
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disable_irq(client->irq);
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/* Finally turn off the power */
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if (data->poweron)
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data->poweron(false);
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return 0;
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}
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static int mcs_touchkey_resume(struct device *dev)
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{
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struct mcs_touchkey_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = data->client;
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/* Enable the device first */
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if (data->poweron)
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data->poweron(true);
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/* Enable irq again */
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enable_irq(client->irq);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(mcs_touchkey_pm_ops,
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mcs_touchkey_suspend, mcs_touchkey_resume);
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static const struct i2c_device_id mcs_touchkey_id[] = {
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{ "mcs5000_touchkey", MCS5000_TOUCHKEY },
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{ "mcs5080_touchkey", MCS5080_TOUCHKEY },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, mcs_touchkey_id);
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static struct i2c_driver mcs_touchkey_driver = {
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.driver = {
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.name = "mcs_touchkey",
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.pm = &mcs_touchkey_pm_ops,
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},
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.probe = mcs_touchkey_probe,
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.remove = mcs_touchkey_remove,
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.shutdown = mcs_touchkey_shutdown,
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.id_table = mcs_touchkey_id,
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};
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module_i2c_driver(mcs_touchkey_driver);
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/* Module information */
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MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
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MODULE_AUTHOR("HeungJun Kim <riverful.kim@samsung.com>");
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MODULE_DESCRIPTION("Touchkey driver for MELFAS MCS5000/5080 controller");
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MODULE_LICENSE("GPL");
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