Input: ili210x - add support for Ilitek ILI210x based touchscreens
The driver supports chipsets ILI2102, ILI2102s, ILI2103, ILI2103s and ILI2105. Such kind of controllers can be found in Amazon Kindle Fire devices. Reviewed-by: Jan Paesmans <jan.paesmans@gmail.com> Reviewed-by: Henrik Rydberg <rydberg@euromail.se> Signed-off-by: Olivier Sobrie <olivier@sobrie.be> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Olivier Sobrie
Dmitry Torokhov
parent
14b5842ebf
commit
5c6a7a62c1
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@ -243,6 +243,21 @@ config TOUCHSCREEN_FUJITSU
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To compile this driver as a module, choose M here: the
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module will be called fujitsu-ts.
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config TOUCHSCREEN_ILI210X
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tristate "Ilitek ILI210X based touchscreen"
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depends on I2C
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help
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Say Y here if you have a ILI210X based touchscreen
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controller. This driver supports models ILI2102,
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ILI2102s, ILI2103, ILI2103s and ILI2105.
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Such kind of chipsets can be found in Amazon Kindle Fire
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touchscreens.
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If unsure, say N.
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To compile this driver as a module, choose M here: the
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module will be called ili210x.
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config TOUCHSCREEN_S3C2410
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tristate "Samsung S3C2410/generic touchscreen input driver"
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depends on ARCH_S3C2410 || SAMSUNG_DEV_TS
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@ -29,6 +29,7 @@ obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o
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obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o
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obj-$(CONFIG_TOUCHSCREEN_EGALAX) += egalax_ts.o
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obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
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obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o
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obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o
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obj-$(CONFIG_TOUCHSCREEN_INTEL_MID) += intel-mid-touch.o
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obj-$(CONFIG_TOUCHSCREEN_LPC32XX) += lpc32xx_ts.o
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@ -0,0 +1,360 @@
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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/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/delay.h>
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#include <linux/workqueue.h>
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#include <linux/input/ili210x.h>
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#define MAX_TOUCHES 2
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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 finger {
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u8 x_low;
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u8 x_high;
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u8 y_low;
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u8 y_high;
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} __packed;
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struct touchdata {
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u8 status;
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struct finger finger[MAX_TOUCHES];
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} __packed;
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struct panel_info {
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struct finger finger_max;
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u8 xchannel_num;
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u8 ychannel_num;
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} __packed;
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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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struct ili210x {
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struct i2c_client *client;
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struct input_dev *input;
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bool (*get_pendown_state)(void);
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unsigned int poll_period;
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struct delayed_work dwork;
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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 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 (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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return 0;
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}
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static void ili210x_report_events(struct input_dev *input,
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const struct touchdata *touchdata)
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{
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int i;
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bool touch;
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unsigned int x, y;
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const struct finger *finger;
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for (i = 0; i < MAX_TOUCHES; i++) {
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input_mt_slot(input, i);
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finger = &touchdata->finger[i];
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touch = touchdata->status & (1 << 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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x = finger->x_low | (finger->x_high << 8);
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y = finger->y_low | (finger->y_high << 8);
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input_report_abs(input, ABS_MT_POSITION_X, x);
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input_report_abs(input, ABS_MT_POSITION_Y, y);
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}
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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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}
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static bool get_pendown_state(const struct ili210x *priv)
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{
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bool state = false;
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if (priv->get_pendown_state)
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state = priv->get_pendown_state();
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return state;
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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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struct touchdata touchdata;
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int error;
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error = ili210x_read_reg(client, REG_TOUCHDATA,
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&touchdata, sizeof(touchdata));
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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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ili210x_report_events(priv->input, &touchdata);
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if ((touchdata.status & 0xf3) || get_pendown_state(priv))
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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, 0644, 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 int __devinit 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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const struct ili210x_platform_data *pdata = dev->platform_data;
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struct ili210x *priv;
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struct input_dev *input;
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struct panel_info panel;
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struct firmware_version firmware;
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int xmax, ymax;
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int error;
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dev_dbg(dev, "Probing for ILI210X I2C Touschreen driver");
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if (!pdata) {
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dev_err(dev, "No platform data!\n");
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return -EINVAL;
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}
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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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/* 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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/* get panel info */
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error = ili210x_read_reg(client, REG_PANEL_INFO, &panel, sizeof(panel));
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if (error) {
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dev_err(dev, "Failed to get panel informations, err: %d\n",
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error);
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return error;
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}
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xmax = panel.finger_max.x_low | (panel.finger_max.x_high << 8);
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ymax = panel.finger_max.y_low | (panel.finger_max.y_high << 8);
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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input = input_allocate_device();
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if (!priv || !input) {
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error = -ENOMEM;
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goto err_free_mem;
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}
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priv->client = client;
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priv->input = input;
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priv->get_pendown_state = pdata->get_pendown_state;
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priv->poll_period = pdata->poll_period ? : DEFAULT_POLL_PERIOD;
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INIT_DELAYED_WORK(&priv->dwork, ili210x_work);
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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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__set_bit(EV_SYN, input->evbit);
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__set_bit(EV_KEY, input->evbit);
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__set_bit(EV_ABS, input->evbit);
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__set_bit(BTN_TOUCH, input->keybit);
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/* Single touch */
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input_set_abs_params(input, ABS_X, 0, xmax, 0, 0);
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input_set_abs_params(input, ABS_Y, 0, ymax, 0, 0);
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/* Multi touch */
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input_mt_init_slots(input, MAX_TOUCHES);
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input_set_abs_params(input, ABS_MT_POSITION_X, 0, xmax, 0, 0);
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input_set_abs_params(input, ABS_MT_POSITION_Y, 0, ymax, 0, 0);
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input_set_drvdata(input, priv);
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i2c_set_clientdata(client, priv);
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error = request_irq(client->irq, ili210x_irq, pdata->irq_flags,
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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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goto err_free_mem;
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}
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error = sysfs_create_group(&dev->kobj, &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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goto err_free_irq;
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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 regiser input device, err: %d\n", error);
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goto err_remove_sysfs;
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}
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device_init_wakeup(&client->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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err_remove_sysfs:
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sysfs_remove_group(&dev->kobj, &ili210x_attr_group);
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err_free_irq:
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free_irq(client->irq, priv);
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err_free_mem:
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input_free_device(input);
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kfree(priv);
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return error;
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}
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static int __devexit ili210x_i2c_remove(struct i2c_client *client)
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{
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struct ili210x *priv = i2c_get_clientdata(client);
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sysfs_remove_group(&client->dev.kobj, &ili210x_attr_group);
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free_irq(priv->client->irq, priv);
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cancel_delayed_work_sync(&priv->dwork);
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input_unregister_device(priv->input);
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kfree(priv);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int 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 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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#endif
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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", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ili210x_i2c_id);
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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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.owner = THIS_MODULE,
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.pm = &ili210x_i2c_pm,
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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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.remove = __devexit_p(ili210x_i2c_remove),
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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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@ -0,0 +1,10 @@
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#ifndef _ILI210X_H
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#define _ILI210X_H
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struct ili210x_platform_data {
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unsigned long irq_flags;
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unsigned int poll_period;
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bool (*get_pendown_state)(void);
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};
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#endif
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