mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 05:34:00 +08:00
f67cc3e927
Fetching the geometry from the ILI251x registers seems unreliable and sometimes returns all zeroes. Add support for fetching the geometry and axis inversion from DT instead. Signed-off-by: Marek Vasut <marex@denx.de> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
424 lines
9.5 KiB
C
424 lines
9.5 KiB
C
#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/slab.h>
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#include <linux/input.h>
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#include <linux/input/mt.h>
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#include <linux/input/touchscreen.h>
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#include <linux/delay.h>
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#include <linux/workqueue.h>
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#include <linux/gpio/consumer.h>
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#include <linux/of_device.h>
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#include <asm/unaligned.h>
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#define ILI210X_TOUCHES 2
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#define ILI251X_TOUCHES 10
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#define DEFAULT_POLL_PERIOD 20
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/* Touchscreen commands */
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#define REG_TOUCHDATA 0x10
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#define REG_PANEL_INFO 0x20
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#define REG_FIRMWARE_VERSION 0x40
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#define REG_CALIBRATE 0xcc
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struct firmware_version {
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u8 id;
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u8 major;
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u8 minor;
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} __packed;
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enum ili2xxx_model {
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MODEL_ILI210X,
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MODEL_ILI251X,
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};
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struct ili210x {
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struct i2c_client *client;
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struct input_dev *input;
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unsigned int poll_period;
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struct delayed_work dwork;
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struct gpio_desc *reset_gpio;
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struct touchscreen_properties prop;
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enum ili2xxx_model model;
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unsigned int max_touches;
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};
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static int ili210x_read_reg(struct i2c_client *client, u8 reg, void *buf,
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size_t len)
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{
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struct ili210x *priv = i2c_get_clientdata(client);
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struct i2c_msg msg[2] = {
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{
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.addr = client->addr,
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.flags = 0,
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.len = 1,
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.buf = ®,
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},
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{
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.addr = client->addr,
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.flags = I2C_M_RD,
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.len = len,
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.buf = buf,
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}
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};
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if (priv->model == MODEL_ILI251X) {
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if (i2c_transfer(client->adapter, msg, 1) != 1) {
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dev_err(&client->dev, "i2c transfer failed\n");
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return -EIO;
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}
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usleep_range(5000, 5500);
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if (i2c_transfer(client->adapter, msg + 1, 1) != 1) {
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dev_err(&client->dev, "i2c transfer failed\n");
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return -EIO;
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}
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} else {
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if (i2c_transfer(client->adapter, msg, 2) != 2) {
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dev_err(&client->dev, "i2c transfer failed\n");
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return -EIO;
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}
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}
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return 0;
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}
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static int ili210x_read(struct i2c_client *client, void *buf, size_t len)
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{
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struct i2c_msg msg = {
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.addr = client->addr,
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.flags = I2C_M_RD,
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.len = len,
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.buf = buf,
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};
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if (i2c_transfer(client->adapter, &msg, 1) != 1) {
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dev_err(&client->dev, "i2c transfer failed\n");
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return -EIO;
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}
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return 0;
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}
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static bool ili210x_touchdata_to_coords(struct ili210x *priv, u8 *touchdata,
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unsigned int finger,
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unsigned int *x, unsigned int *y)
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{
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if (finger >= ILI210X_TOUCHES)
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return false;
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if (touchdata[0] & BIT(finger))
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return false;
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*x = get_unaligned_be16(touchdata + 1 + (finger * 4) + 0);
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*y = get_unaligned_be16(touchdata + 1 + (finger * 4) + 2);
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return true;
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}
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static bool ili251x_touchdata_to_coords(struct ili210x *priv, u8 *touchdata,
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unsigned int finger,
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unsigned int *x, unsigned int *y)
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{
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if (finger >= ILI251X_TOUCHES)
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return false;
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*x = get_unaligned_be16(touchdata + 1 + (finger * 5) + 0);
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if (!(*x & BIT(15))) /* Touch indication */
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return false;
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*x &= 0x3fff;
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*y = get_unaligned_be16(touchdata + 1 + (finger * 5) + 2);
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return true;
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}
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static bool ili210x_report_events(struct ili210x *priv, u8 *touchdata)
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{
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struct input_dev *input = priv->input;
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int i;
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bool contact = false, touch = false;
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unsigned int x = 0, y = 0;
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for (i = 0; i < priv->max_touches; i++) {
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if (priv->model == MODEL_ILI210X) {
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touch = ili210x_touchdata_to_coords(priv, touchdata,
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i, &x, &y);
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} else if (priv->model == MODEL_ILI251X) {
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touch = ili251x_touchdata_to_coords(priv, touchdata,
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i, &x, &y);
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if (touch)
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contact = true;
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}
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input_mt_slot(input, i);
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input_mt_report_slot_state(input, MT_TOOL_FINGER, touch);
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if (!touch)
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continue;
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touchscreen_report_pos(input, &priv->prop, x, y,
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true);
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}
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input_mt_report_pointer_emulation(input, false);
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input_sync(input);
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if (priv->model == MODEL_ILI210X)
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contact = touchdata[0] & 0xf3;
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return contact;
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}
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static void ili210x_work(struct work_struct *work)
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{
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struct ili210x *priv = container_of(work, struct ili210x,
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dwork.work);
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struct i2c_client *client = priv->client;
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u8 touchdata[64] = { 0 };
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bool touch;
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int error = -EINVAL;
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if (priv->model == MODEL_ILI210X) {
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error = ili210x_read_reg(client, REG_TOUCHDATA,
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touchdata, sizeof(touchdata));
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} else if (priv->model == MODEL_ILI251X) {
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error = ili210x_read_reg(client, REG_TOUCHDATA,
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touchdata, 31);
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if (!error && touchdata[0] == 2)
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error = ili210x_read(client, &touchdata[31], 20);
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}
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if (error) {
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dev_err(&client->dev,
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"Unable to get touchdata, err = %d\n", error);
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return;
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}
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touch = ili210x_report_events(priv, touchdata);
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if (touch)
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schedule_delayed_work(&priv->dwork,
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msecs_to_jiffies(priv->poll_period));
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}
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static irqreturn_t ili210x_irq(int irq, void *irq_data)
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{
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struct ili210x *priv = irq_data;
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schedule_delayed_work(&priv->dwork, 0);
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return IRQ_HANDLED;
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}
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static ssize_t ili210x_calibrate(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct ili210x *priv = i2c_get_clientdata(client);
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unsigned long calibrate;
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int rc;
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u8 cmd = REG_CALIBRATE;
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if (kstrtoul(buf, 10, &calibrate))
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return -EINVAL;
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if (calibrate > 1)
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return -EINVAL;
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if (calibrate) {
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rc = i2c_master_send(priv->client, &cmd, sizeof(cmd));
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if (rc != sizeof(cmd))
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return -EIO;
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}
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return count;
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}
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static DEVICE_ATTR(calibrate, S_IWUSR, NULL, ili210x_calibrate);
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static struct attribute *ili210x_attributes[] = {
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&dev_attr_calibrate.attr,
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NULL,
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};
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static const struct attribute_group ili210x_attr_group = {
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.attrs = ili210x_attributes,
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};
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static void ili210x_power_down(void *data)
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{
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struct gpio_desc *reset_gpio = data;
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gpiod_set_value_cansleep(reset_gpio, 1);
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}
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static void ili210x_cancel_work(void *data)
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{
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struct ili210x *priv = data;
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cancel_delayed_work_sync(&priv->dwork);
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}
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static int ili210x_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device *dev = &client->dev;
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struct ili210x *priv;
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struct gpio_desc *reset_gpio;
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struct input_dev *input;
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struct firmware_version firmware;
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enum ili2xxx_model model;
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int error;
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model = (enum ili2xxx_model)id->driver_data;
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dev_dbg(dev, "Probing for ILI210X I2C Touschreen driver");
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if (client->irq <= 0) {
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dev_err(dev, "No IRQ!\n");
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return -EINVAL;
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}
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reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
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if (IS_ERR(reset_gpio))
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return PTR_ERR(reset_gpio);
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if (reset_gpio) {
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error = devm_add_action_or_reset(dev, ili210x_power_down,
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reset_gpio);
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if (error)
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return error;
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usleep_range(50, 100);
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gpiod_set_value_cansleep(reset_gpio, 0);
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msleep(100);
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}
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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input = devm_input_allocate_device(dev);
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if (!input)
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return -ENOMEM;
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priv->client = client;
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priv->input = input;
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priv->poll_period = DEFAULT_POLL_PERIOD;
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INIT_DELAYED_WORK(&priv->dwork, ili210x_work);
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priv->reset_gpio = reset_gpio;
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priv->model = model;
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if (model == MODEL_ILI210X)
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priv->max_touches = ILI210X_TOUCHES;
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if (model == MODEL_ILI251X)
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priv->max_touches = ILI251X_TOUCHES;
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i2c_set_clientdata(client, priv);
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/* Get firmware version */
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error = ili210x_read_reg(client, REG_FIRMWARE_VERSION,
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&firmware, sizeof(firmware));
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if (error) {
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dev_err(dev, "Failed to get firmware version, err: %d\n",
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error);
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return error;
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}
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/* Setup input device */
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input->name = "ILI210x Touchscreen";
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input->id.bustype = BUS_I2C;
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input->dev.parent = dev;
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/* Multi touch */
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input_set_abs_params(input, ABS_MT_POSITION_X, 0, 0xffff, 0, 0);
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input_set_abs_params(input, ABS_MT_POSITION_Y, 0, 0xffff, 0, 0);
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touchscreen_parse_properties(input, true, &priv->prop);
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input_mt_init_slots(input, priv->max_touches, INPUT_MT_DIRECT);
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error = devm_add_action(dev, ili210x_cancel_work, priv);
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if (error)
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return error;
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error = devm_request_irq(dev, client->irq, ili210x_irq, 0,
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client->name, priv);
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if (error) {
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dev_err(dev, "Unable to request touchscreen IRQ, err: %d\n",
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error);
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return error;
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}
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error = devm_device_add_group(dev, &ili210x_attr_group);
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if (error) {
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dev_err(dev, "Unable to create sysfs attributes, err: %d\n",
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error);
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return error;
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}
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error = input_register_device(priv->input);
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if (error) {
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dev_err(dev, "Cannot register input device, err: %d\n", error);
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return error;
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}
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device_init_wakeup(dev, 1);
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dev_dbg(dev,
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"ILI210x initialized (IRQ: %d), firmware version %d.%d.%d",
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client->irq, firmware.id, firmware.major, firmware.minor);
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return 0;
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}
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static int __maybe_unused ili210x_i2c_suspend(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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enable_irq_wake(client->irq);
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return 0;
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}
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static int __maybe_unused ili210x_i2c_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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return 0;
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}
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static SIMPLE_DEV_PM_OPS(ili210x_i2c_pm,
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ili210x_i2c_suspend, ili210x_i2c_resume);
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static const struct i2c_device_id ili210x_i2c_id[] = {
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{ "ili210x", MODEL_ILI210X },
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{ "ili251x", MODEL_ILI251X },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ili210x_i2c_id);
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static const struct of_device_id ili210x_dt_ids[] = {
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{ .compatible = "ilitek,ili210x", .data = (void *)MODEL_ILI210X },
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{ .compatible = "ilitek,ili251x", .data = (void *)MODEL_ILI251X },
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{ },
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};
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MODULE_DEVICE_TABLE(of, ili210x_dt_ids);
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static struct i2c_driver ili210x_ts_driver = {
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.driver = {
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.name = "ili210x_i2c",
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.pm = &ili210x_i2c_pm,
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.of_match_table = ili210x_dt_ids,
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},
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.id_table = ili210x_i2c_id,
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.probe = ili210x_i2c_probe,
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};
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module_i2c_driver(ili210x_ts_driver);
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MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
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MODULE_DESCRIPTION("ILI210X I2C Touchscreen Driver");
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MODULE_LICENSE("GPL");
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