![Bill Pemberton](/assets/img/avatar_default.png)
CONFIG_HOTPLUG is going away as an option so __devexit is no longer needed. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
361 lines
7.9 KiB
C
361 lines
7.9 KiB
C
#include <linux/module.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/input.h>
|
|
#include <linux/input/mt.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/input/ili210x.h>
|
|
|
|
#define MAX_TOUCHES 2
|
|
#define DEFAULT_POLL_PERIOD 20
|
|
|
|
/* Touchscreen commands */
|
|
#define REG_TOUCHDATA 0x10
|
|
#define REG_PANEL_INFO 0x20
|
|
#define REG_FIRMWARE_VERSION 0x40
|
|
#define REG_CALIBRATE 0xcc
|
|
|
|
struct finger {
|
|
u8 x_low;
|
|
u8 x_high;
|
|
u8 y_low;
|
|
u8 y_high;
|
|
} __packed;
|
|
|
|
struct touchdata {
|
|
u8 status;
|
|
struct finger finger[MAX_TOUCHES];
|
|
} __packed;
|
|
|
|
struct panel_info {
|
|
struct finger finger_max;
|
|
u8 xchannel_num;
|
|
u8 ychannel_num;
|
|
} __packed;
|
|
|
|
struct firmware_version {
|
|
u8 id;
|
|
u8 major;
|
|
u8 minor;
|
|
} __packed;
|
|
|
|
struct ili210x {
|
|
struct i2c_client *client;
|
|
struct input_dev *input;
|
|
bool (*get_pendown_state)(void);
|
|
unsigned int poll_period;
|
|
struct delayed_work dwork;
|
|
};
|
|
|
|
static int ili210x_read_reg(struct i2c_client *client, u8 reg, void *buf,
|
|
size_t len)
|
|
{
|
|
struct i2c_msg msg[2] = {
|
|
{
|
|
.addr = client->addr,
|
|
.flags = 0,
|
|
.len = 1,
|
|
.buf = ®,
|
|
},
|
|
{
|
|
.addr = client->addr,
|
|
.flags = I2C_M_RD,
|
|
.len = len,
|
|
.buf = buf,
|
|
}
|
|
};
|
|
|
|
if (i2c_transfer(client->adapter, msg, 2) != 2) {
|
|
dev_err(&client->dev, "i2c transfer failed\n");
|
|
return -EIO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ili210x_report_events(struct input_dev *input,
|
|
const struct touchdata *touchdata)
|
|
{
|
|
int i;
|
|
bool touch;
|
|
unsigned int x, y;
|
|
const struct finger *finger;
|
|
|
|
for (i = 0; i < MAX_TOUCHES; i++) {
|
|
input_mt_slot(input, i);
|
|
|
|
finger = &touchdata->finger[i];
|
|
|
|
touch = touchdata->status & (1 << i);
|
|
input_mt_report_slot_state(input, MT_TOOL_FINGER, touch);
|
|
if (touch) {
|
|
x = finger->x_low | (finger->x_high << 8);
|
|
y = finger->y_low | (finger->y_high << 8);
|
|
|
|
input_report_abs(input, ABS_MT_POSITION_X, x);
|
|
input_report_abs(input, ABS_MT_POSITION_Y, y);
|
|
}
|
|
}
|
|
|
|
input_mt_report_pointer_emulation(input, false);
|
|
input_sync(input);
|
|
}
|
|
|
|
static bool get_pendown_state(const struct ili210x *priv)
|
|
{
|
|
bool state = false;
|
|
|
|
if (priv->get_pendown_state)
|
|
state = priv->get_pendown_state();
|
|
|
|
return state;
|
|
}
|
|
|
|
static void ili210x_work(struct work_struct *work)
|
|
{
|
|
struct ili210x *priv = container_of(work, struct ili210x,
|
|
dwork.work);
|
|
struct i2c_client *client = priv->client;
|
|
struct touchdata touchdata;
|
|
int error;
|
|
|
|
error = ili210x_read_reg(client, REG_TOUCHDATA,
|
|
&touchdata, sizeof(touchdata));
|
|
if (error) {
|
|
dev_err(&client->dev,
|
|
"Unable to get touchdata, err = %d\n", error);
|
|
return;
|
|
}
|
|
|
|
ili210x_report_events(priv->input, &touchdata);
|
|
|
|
if ((touchdata.status & 0xf3) || get_pendown_state(priv))
|
|
schedule_delayed_work(&priv->dwork,
|
|
msecs_to_jiffies(priv->poll_period));
|
|
}
|
|
|
|
static irqreturn_t ili210x_irq(int irq, void *irq_data)
|
|
{
|
|
struct ili210x *priv = irq_data;
|
|
|
|
schedule_delayed_work(&priv->dwork, 0);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static ssize_t ili210x_calibrate(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct ili210x *priv = i2c_get_clientdata(client);
|
|
unsigned long calibrate;
|
|
int rc;
|
|
u8 cmd = REG_CALIBRATE;
|
|
|
|
if (kstrtoul(buf, 10, &calibrate))
|
|
return -EINVAL;
|
|
|
|
if (calibrate > 1)
|
|
return -EINVAL;
|
|
|
|
if (calibrate) {
|
|
rc = i2c_master_send(priv->client, &cmd, sizeof(cmd));
|
|
if (rc != sizeof(cmd))
|
|
return -EIO;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
static DEVICE_ATTR(calibrate, 0644, NULL, ili210x_calibrate);
|
|
|
|
static struct attribute *ili210x_attributes[] = {
|
|
&dev_attr_calibrate.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group ili210x_attr_group = {
|
|
.attrs = ili210x_attributes,
|
|
};
|
|
|
|
static int ili210x_i2c_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
const struct ili210x_platform_data *pdata = dev->platform_data;
|
|
struct ili210x *priv;
|
|
struct input_dev *input;
|
|
struct panel_info panel;
|
|
struct firmware_version firmware;
|
|
int xmax, ymax;
|
|
int error;
|
|
|
|
dev_dbg(dev, "Probing for ILI210X I2C Touschreen driver");
|
|
|
|
if (!pdata) {
|
|
dev_err(dev, "No platform data!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (client->irq <= 0) {
|
|
dev_err(dev, "No IRQ!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Get firmware version */
|
|
error = ili210x_read_reg(client, REG_FIRMWARE_VERSION,
|
|
&firmware, sizeof(firmware));
|
|
if (error) {
|
|
dev_err(dev, "Failed to get firmware version, err: %d\n",
|
|
error);
|
|
return error;
|
|
}
|
|
|
|
/* get panel info */
|
|
error = ili210x_read_reg(client, REG_PANEL_INFO, &panel, sizeof(panel));
|
|
if (error) {
|
|
dev_err(dev, "Failed to get panel informations, err: %d\n",
|
|
error);
|
|
return error;
|
|
}
|
|
|
|
xmax = panel.finger_max.x_low | (panel.finger_max.x_high << 8);
|
|
ymax = panel.finger_max.y_low | (panel.finger_max.y_high << 8);
|
|
|
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
|
input = input_allocate_device();
|
|
if (!priv || !input) {
|
|
error = -ENOMEM;
|
|
goto err_free_mem;
|
|
}
|
|
|
|
priv->client = client;
|
|
priv->input = input;
|
|
priv->get_pendown_state = pdata->get_pendown_state;
|
|
priv->poll_period = pdata->poll_period ? : DEFAULT_POLL_PERIOD;
|
|
INIT_DELAYED_WORK(&priv->dwork, ili210x_work);
|
|
|
|
/* Setup input device */
|
|
input->name = "ILI210x Touchscreen";
|
|
input->id.bustype = BUS_I2C;
|
|
input->dev.parent = dev;
|
|
|
|
__set_bit(EV_SYN, input->evbit);
|
|
__set_bit(EV_KEY, input->evbit);
|
|
__set_bit(EV_ABS, input->evbit);
|
|
__set_bit(BTN_TOUCH, input->keybit);
|
|
|
|
/* Single touch */
|
|
input_set_abs_params(input, ABS_X, 0, xmax, 0, 0);
|
|
input_set_abs_params(input, ABS_Y, 0, ymax, 0, 0);
|
|
|
|
/* Multi touch */
|
|
input_mt_init_slots(input, MAX_TOUCHES, 0);
|
|
input_set_abs_params(input, ABS_MT_POSITION_X, 0, xmax, 0, 0);
|
|
input_set_abs_params(input, ABS_MT_POSITION_Y, 0, ymax, 0, 0);
|
|
|
|
input_set_drvdata(input, priv);
|
|
i2c_set_clientdata(client, priv);
|
|
|
|
error = request_irq(client->irq, ili210x_irq, pdata->irq_flags,
|
|
client->name, priv);
|
|
if (error) {
|
|
dev_err(dev, "Unable to request touchscreen IRQ, err: %d\n",
|
|
error);
|
|
goto err_free_mem;
|
|
}
|
|
|
|
error = sysfs_create_group(&dev->kobj, &ili210x_attr_group);
|
|
if (error) {
|
|
dev_err(dev, "Unable to create sysfs attributes, err: %d\n",
|
|
error);
|
|
goto err_free_irq;
|
|
}
|
|
|
|
error = input_register_device(priv->input);
|
|
if (error) {
|
|
dev_err(dev, "Cannot regiser input device, err: %d\n", error);
|
|
goto err_remove_sysfs;
|
|
}
|
|
|
|
device_init_wakeup(&client->dev, 1);
|
|
|
|
dev_dbg(dev,
|
|
"ILI210x initialized (IRQ: %d), firmware version %d.%d.%d",
|
|
client->irq, firmware.id, firmware.major, firmware.minor);
|
|
|
|
return 0;
|
|
|
|
err_remove_sysfs:
|
|
sysfs_remove_group(&dev->kobj, &ili210x_attr_group);
|
|
err_free_irq:
|
|
free_irq(client->irq, priv);
|
|
err_free_mem:
|
|
input_free_device(input);
|
|
kfree(priv);
|
|
return error;
|
|
}
|
|
|
|
static int ili210x_i2c_remove(struct i2c_client *client)
|
|
{
|
|
struct ili210x *priv = i2c_get_clientdata(client);
|
|
|
|
sysfs_remove_group(&client->dev.kobj, &ili210x_attr_group);
|
|
free_irq(priv->client->irq, priv);
|
|
cancel_delayed_work_sync(&priv->dwork);
|
|
input_unregister_device(priv->input);
|
|
kfree(priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int ili210x_i2c_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
if (device_may_wakeup(&client->dev))
|
|
enable_irq_wake(client->irq);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ili210x_i2c_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
|
|
if (device_may_wakeup(&client->dev))
|
|
disable_irq_wake(client->irq);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(ili210x_i2c_pm,
|
|
ili210x_i2c_suspend, ili210x_i2c_resume);
|
|
|
|
static const struct i2c_device_id ili210x_i2c_id[] = {
|
|
{ "ili210x", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ili210x_i2c_id);
|
|
|
|
static struct i2c_driver ili210x_ts_driver = {
|
|
.driver = {
|
|
.name = "ili210x_i2c",
|
|
.owner = THIS_MODULE,
|
|
.pm = &ili210x_i2c_pm,
|
|
},
|
|
.id_table = ili210x_i2c_id,
|
|
.probe = ili210x_i2c_probe,
|
|
.remove = ili210x_i2c_remove,
|
|
};
|
|
|
|
module_i2c_driver(ili210x_ts_driver);
|
|
|
|
MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
|
|
MODULE_DESCRIPTION("ILI210X I2C Touchscreen Driver");
|
|
MODULE_LICENSE("GPL");
|