- 根目录:
- drivers
- input
- touchscreen
- mms114.c
/*
* Copyright (C) 2012 Samsung Electronics Co.Ltd
* Author: Joonyoung Shim <jy0922.shim@samsung.com>
*
* 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.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/i2c.h>
#include <linux/i2c/mms114.h>
#include <linux/input/mt.h>
#include <linux/interrupt.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
/* Write only registers */
#define MMS114_MODE_CONTROL 0x01
#define MMS114_OPERATION_MODE_MASK 0xE
#define MMS114_ACTIVE (1 << 1)
#define MMS114_XY_RESOLUTION_H 0x02
#define MMS114_X_RESOLUTION 0x03
#define MMS114_Y_RESOLUTION 0x04
#define MMS114_CONTACT_THRESHOLD 0x05
#define MMS114_MOVING_THRESHOLD 0x06
/* Read only registers */
#define MMS114_PACKET_SIZE 0x0F
#define MMS114_INFOMATION 0x10
#define MMS114_TSP_REV 0xF0
/* Minimum delay time is 50us between stop and start signal of i2c */
#define MMS114_I2C_DELAY 50
/* 200ms needs after power on */
#define MMS114_POWERON_DELAY 200
/* Touchscreen absolute values */
#define MMS114_MAX_AREA 0xff
#define MMS114_MAX_TOUCH 10
#define MMS114_PACKET_NUM 8
/* Touch type */
#define MMS114_TYPE_NONE 0
#define MMS114_TYPE_TOUCHSCREEN 1
#define MMS114_TYPE_TOUCHKEY 2
struct mms114_data {
struct i2c_client *client;
struct input_dev *input_dev;
struct regulator *core_reg;
struct regulator *io_reg;
const struct mms114_platform_data *pdata;
/* Use cache data for mode control register(write only) */
u8 cache_mode_control;
};
struct mms114_touch {
u8 id:4, reserved_bit4:1, type:2, pressed:1;
u8 x_hi:4, y_hi:4;
u8 x_lo;
u8 y_lo;
u8 width;
u8 strength;
u8 reserved[2];
} __packed;
static int __mms114_read_reg(struct mms114_data *data, unsigned int reg,
unsigned int len, u8 *val)
{
struct i2c_client *client = data->client;
struct i2c_msg xfer[2];
u8 buf = reg & 0xff;
int error;
if (reg <= MMS114_MODE_CONTROL && reg + len > MMS114_MODE_CONTROL)
BUG();
/* Write register: use repeated start */
xfer[0].addr = client->addr;
xfer[0].flags = I2C_M_TEN | I2C_M_NOSTART;
xfer[0].len = 1;
xfer[0].buf = &buf;
/* Read data */
xfer[1].addr = client->addr;
xfer[1].flags = I2C_M_RD;
xfer[1].len = len;
xfer[1].buf = val;
error = i2c_transfer(client->adapter, xfer, 2);
if (error != 2) {
dev_err(&client->dev,
"%s: i2c transfer failed (%d)\n", __func__, error);
return error < 0 ? error : -EIO;
}
udelay(MMS114_I2C_DELAY);
return 0;
}
static int mms114_read_reg(struct mms114_data *data, unsigned int reg)
{
u8 val;
int error;
if (reg == MMS114_MODE_CONTROL)
return data->cache_mode_control;
error = __mms114_read_reg(data, reg, 1, &val);
return error < 0 ? error : val;
}
static int mms114_write_reg(struct mms114_data *data, unsigned int reg,
unsigned int val)
{
struct i2c_client *client = data->client;
u8 buf[2];
int error;
buf[0] = reg & 0xff;
buf[1] = val & 0xff;
error = i2c_master_send(client, buf, 2);
if (error != 2) {
dev_err(&client->dev,
"%s: i2c send failed (%d)\n", __func__, error);
return error < 0 ? error : -EIO;
}
udelay(MMS114_I2C_DELAY);
if (reg == MMS114_MODE_CONTROL)
data->cache_mode_control = val;
return 0;
}
static void mms114_process_mt(struct mms114_data *data, struct mms114_touch *touch)
{
const struct mms114_platform_data *pdata = data->pdata;
struct i2c_client *client = data->client;
struct input_dev *input_dev = data->input_dev;
unsigned int id;
unsigned int x;
unsigned int y;
if (touch->id > MMS114_MAX_TOUCH) {
dev_err(&client->dev, "Wrong touch id (%d)\n", touch->id);
return;
}
if (touch->type != MMS114_TYPE_TOUCHSCREEN) {
dev_err(&client->dev, "Wrong touch type (%d)\n", touch->type);
return;
}
id = touch->id - 1;
x = touch->x_lo | touch->x_hi << 8;
y = touch->y_lo | touch->y_hi << 8;
if (x > pdata->x_size || y > pdata->y_size) {
dev_dbg(&client->dev,
"Wrong touch coordinates (%d, %d)\n", x, y);
return;
}
if (pdata->x_invert)
x = pdata->x_size - x;
if (pdata->y_invert)
y = pdata->y_size - y;
dev_dbg(&client->dev,
"id: %d, type: %d, pressed: %d, x: %d, y: %d, width: %d, strength: %d\n",
id, touch->type, touch->pressed,
x, y, touch->width, touch->strength);
input_mt_slot(input_dev, id);
input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, touch->pressed);
if (touch->pressed) {
input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, touch->width);
input_report_abs(input_dev, ABS_MT_POSITION_X, x);
input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
input_report_abs(input_dev, ABS_MT_PRESSURE, touch->strength);
}
}
static irqreturn_t mms114_interrupt(int irq, void *dev_id)
{
struct mms114_data *data = dev_id;
struct input_dev *input_dev = data->input_dev;
struct mms114_touch touch[MMS114_MAX_TOUCH];
int packet_size;
int touch_size;
int index;
int error;
mutex_lock(&input_dev->mutex);
if (!input_dev->users) {
mutex_unlock(&input_dev->mutex);
goto out;
}
mutex_unlock(&input_dev->mutex);
packet_size = mms114_read_reg(data, MMS114_PACKET_SIZE);
if (packet_size <= 0)
goto out;
touch_size = packet_size / MMS114_PACKET_NUM;
error = __mms114_read_reg(data, MMS114_INFOMATION, packet_size,
(u8 *)touch);
if (error < 0)
goto out;
for (index = 0; index < touch_size; index++)
mms114_process_mt(data, touch + index);
input_mt_report_pointer_emulation(data->input_dev, true);
input_sync(data->input_dev);
out:
return IRQ_HANDLED;
}
static int mms114_set_active(struct mms114_data *data, bool active)
{
int val;
val = mms114_read_reg(data, MMS114_MODE_CONTROL);
if (val < 0)
return val;
val &= ~MMS114_OPERATION_MODE_MASK;
/* If active is false, sleep mode */
if (active)
val |= MMS114_ACTIVE;
return mms114_write_reg(data, MMS114_MODE_CONTROL, val);
}
static int mms114_get_version(struct mms114_data *data)
{
struct device *dev = &data->client->dev;
u8 buf[6];
int error;
error = __mms114_read_reg(data, MMS114_TSP_REV, 6, buf);
if (error < 0)
return error;
dev_info(dev, "TSP Rev: 0x%x, HW Rev: 0x%x, Firmware Ver: 0x%x\n",
buf[0], buf[1], buf[3]);
return 0;
}
static int mms114_setup_regs(struct mms114_data *data)
{
const struct mms114_platform_data *pdata = data->pdata;
int val;
int error;
error = mms114_get_version(data);
if (error < 0)
return error;
error = mms114_set_active(data, true);
if (error < 0)
return error;
val = (pdata->x_size >> 8) & 0xf;
val |= ((pdata->y_size >> 8) & 0xf) << 4;
error = mms114_write_reg(data, MMS114_XY_RESOLUTION_H, val);
if (error < 0)
return error;
val = pdata->x_size & 0xff;
error = mms114_write_reg(data, MMS114_X_RESOLUTION, val);
if (error < 0)
return error;
val = pdata->y_size & 0xff;
error = mms114_write_reg(data, MMS114_Y_RESOLUTION, val);
if (error < 0)
return error;
if (pdata->contact_threshold) {
error = mms114_write_reg(data, MMS114_CONTACT_THRESHOLD,
pdata->contact_threshold);
if (error < 0)
return error;
}
if (pdata->moving_threshold) {
error = mms114_write_reg(data, MMS114_MOVING_THRESHOLD,
pdata->moving_threshold);
if (error < 0)
return error;
}
return 0;
}
static int mms114_start(struct mms114_data *data)
{
struct i2c_client *client = data->client;
int error;
error = regulator_enable(data->core_reg);
if (error) {
dev_err(&client->dev, "Failed to enable avdd: %d\n", error);
return error;
}
error = regulator_enable(data->io_reg);
if (error) {
dev_err(&client->dev, "Failed to enable vdd: %d\n", error);
regulator_disable(data->core_reg);
return error;
}
mdelay(MMS114_POWERON_DELAY);
error = mms114_setup_regs(data);
if (error < 0) {
regulator_disable(data->io_reg);
regulator_disable(data->core_reg);
return error;
}
if (data->pdata->cfg_pin)
data->pdata->cfg_pin(true);
enable_irq(client->irq);
return 0;
}
static void mms114_stop(struct mms114_data *data)
{
struct i2c_client *client = data->client;
int error;
disable_irq(client->irq);
if (data->pdata->cfg_pin)
data->pdata->cfg_pin(false);
error = regulator_disable(data->io_reg);
if (error)
dev_warn(&client->dev, "Failed to disable vdd: %d\n", error);
error = regulator_disable(data->core_reg);
if (error)
dev_warn(&client->dev, "Failed to disable avdd: %d\n", error);
}
static int mms114_input_open(struct input_dev *dev)
{
struct mms114_data *data = input_get_drvdata(dev);
return mms114_start(data);
}
static void mms114_input_close(struct input_dev *dev)
{
struct mms114_data *data = input_get_drvdata(dev);
mms114_stop(data);
}
#ifdef CONFIG_OF
static struct mms114_platform_data *mms114_parse_dt(struct device *dev)
{
struct mms114_platform_data *pdata;
struct device_node *np = dev->of_node;
if (!np)
return NULL;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
dev_err(dev, "failed to allocate platform data\n");
return NULL;
}
if (of_property_read_u32(np, "x-size", &pdata->x_size)) {
dev_err(dev, "failed to get x-size property\n");
return NULL;
};
if (of_property_read_u32(np, "y-size", &pdata->y_size)) {
dev_err(dev, "failed to get y-size property\n");
return NULL;
};
of_property_read_u32(np, "contact-threshold",
&pdata->contact_threshold);
of_property_read_u32(np, "moving-threshold",
&pdata->moving_threshold);
if (of_find_property(np, "x-invert", NULL))
pdata->x_invert = true;
if (of_find_property(np, "y-invert", NULL))
pdata->y_invert = true;
return pdata;
}
#else
static inline struct mms114_platform_data *mms114_parse_dt(struct device *dev)
{
return NULL;
}
#endif
static int mms114_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
const struct mms114_platform_data *pdata;
struct mms114_data *data;
struct input_dev *input_dev;
int error;
pdata = dev_get_platdata(&client->dev);
if (!pdata)
pdata = mms114_parse_dt(&client->dev);
if (!pdata) {
dev_err(&client->dev, "Need platform data\n");
return -EINVAL;
}
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_PROTOCOL_MANGLING)) {
dev_err(&client->dev,
"Need i2c bus that supports protocol mangling\n");
return -ENODEV;
}
data = devm_kzalloc(&client->dev, sizeof(struct mms114_data),
GFP_KERNEL);
input_dev = devm_input_allocate_device(&client->dev);
if (!data || !input_dev) {
dev_err(&client->dev, "Failed to allocate memory\n");
return -ENOMEM;
}
data->client = client;
data->input_dev = input_dev;
data->pdata = pdata;
input_dev->name = "MELPAS MMS114 Touchscreen";
input_dev->id.bustype = BUS_I2C;
input_dev->dev.parent = &client->dev;
input_dev->open = mms114_input_open;
input_dev->close = mms114_input_close;
__set_bit(EV_ABS, input_dev->evbit);
__set_bit(EV_KEY, input_dev->evbit);
__set_bit(BTN_TOUCH, input_dev->keybit);
input_set_abs_params(input_dev, ABS_X, 0, data->pdata->x_size, 0, 0);
input_set_abs_params(input_dev, ABS_Y, 0, data->pdata->y_size, 0, 0);
/* For multi touch */
input_mt_init_slots(input_dev, MMS114_MAX_TOUCH, 0);
input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
0, MMS114_MAX_AREA, 0, 0);
input_set_abs_params(input_dev, ABS_MT_POSITION_X,
0, data->pdata->x_size, 0, 0);
input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
0, data->pdata->y_size, 0, 0);
input_set_abs_params(input_dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
input_set_drvdata(input_dev, data);
i2c_set_clientdata(client, data);
data->core_reg = devm_regulator_get(&client->dev, "avdd");
if (IS_ERR(data->core_reg)) {
error = PTR_ERR(data->core_reg);
dev_err(&client->dev,
"Unable to get the Core regulator (%d)\n", error);
return error;
}
data->io_reg = devm_regulator_get(&client->dev, "vdd");
if (IS_ERR(data->io_reg)) {
error = PTR_ERR(data->io_reg);
dev_err(&client->dev,
"Unable to get the IO regulator (%d)\n", error);
return error;
}
error = devm_request_threaded_irq(&client->dev, client->irq, NULL,
mms114_interrupt, IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
dev_name(&client->dev), data);
if (error) {
dev_err(&client->dev, "Failed to register interrupt\n");
return error;
}
disable_irq(client->irq);
error = input_register_device(data->input_dev);
if (error) {
dev_err(&client->dev, "Failed to register input device\n");
return error;
}
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int mms114_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct mms114_data *data = i2c_get_clientdata(client);
struct input_dev *input_dev = data->input_dev;
int id;
/* Release all touch */
for (id = 0; id < MMS114_MAX_TOUCH; id++) {
input_mt_slot(input_dev, id);
input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, false);
}
input_mt_report_pointer_emulation(input_dev, true);
input_sync(input_dev);
mutex_lock(&input_dev->mutex);
if (input_dev->users)
mms114_stop(data);
mutex_unlock(&input_dev->mutex);
return 0;
}
static int mms114_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct mms114_data *data = i2c_get_clientdata(client);
struct input_dev *input_dev = data->input_dev;
int error;
mutex_lock(&input_dev->mutex);
if (input_dev->users) {
error = mms114_start(data);
if (error < 0) {
mutex_unlock(&input_dev->mutex);
return error;
}
}
mutex_unlock(&input_dev->mutex);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(mms114_pm_ops, mms114_suspend, mms114_resume);
static const struct i2c_device_id mms114_id[] = {
{ "mms114", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, mms114_id);
#ifdef CONFIG_OF
static struct of_device_id mms114_dt_match[] = {
{ .compatible = "melfas,mms114" },
{ }
};
#endif
static struct i2c_driver mms114_driver = {
.driver = {
.name = "mms114",
.owner = THIS_MODULE,
.pm = &mms114_pm_ops,
.of_match_table = of_match_ptr(mms114_dt_match),
},
.probe = mms114_probe,
.id_table = mms114_id,
};
module_i2c_driver(mms114_driver);
/* Module information */
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
MODULE_DESCRIPTION("MELFAS mms114 Touchscreen driver");
MODULE_LICENSE("GPL");