From: Siebren Vroegindeweij <siebren.vroegindeweij@xxxxxxxxxxx> This adds a driver for the Elan eKTF2127 touchscreen controller, which speaks an i2c protocol which is distinctly different from the already supported eKTH controllers. Signed-off-by: Michel Verlaan <michel.verl@xxxxxxxxx> Signed-off-by: Siebren Vroegindeweij <siebren.vroegindeweij@xxxxxxxxxxx> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> --- Changes in v2: -Improve devicetree bindings document -Use touchscreen_parse_properties and touchscreen_report_pos instead of DIY -Remove a bunch of unused defines (copy and paste leftover from chipone driver) -Some other minor cleanups and review comments addressed -Add defines for some command / address hex-values -Check packet header in interrupt handler --- .../bindings/input/touchscreen/ektf2127.txt | 27 ++ drivers/input/touchscreen/Kconfig | 12 + drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/ektf2127.c | 333 +++++++++++++++++++++ 4 files changed, 373 insertions(+) create mode 100644 Documentation/devicetree/bindings/input/touchscreen/ektf2127.txt create mode 100644 drivers/input/touchscreen/ektf2127.c diff --git a/Documentation/devicetree/bindings/input/touchscreen/ektf2127.txt b/Documentation/devicetree/bindings/input/touchscreen/ektf2127.txt new file mode 100644 index 0000000..5a19f4c --- /dev/null +++ b/Documentation/devicetree/bindings/input/touchscreen/ektf2127.txt @@ -0,0 +1,27 @@ +* Elan eKTF2127 I2C touchscreen controller + +Required properties: + - compatible : "elan,ektf2127" + - reg : I2C slave address of the chip (0x40) + - interrupt-parent : a phandle pointing to the interrupt controller + serving the interrupt for this chip + - interrupts : interrupt specification for the ektf2127 interrupt + - power-gpios : GPIO specification for the pin connected to the + ektf2127's wake input. This needs to be driven high + to take ektf2127 out of it's low power state + +For additional optional properties see: touchscreen.txt + +Example: + +i2c@00000000 { + ektf2127: touchscreen@15 { + compatible = "elan,ektf2127"; + reg = <0x15>; + interrupt-parent = <&pio>; + interrupts = <6 11 IRQ_TYPE_EDGE_FALLING> + power-gpios = <&pio 1 3 GPIO_ACTIVE_HIGH>; + touchscreen-inverted-x; + touchscreen-swapped-x-y; + }; +}; diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index 3b3d07a..880aa50 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -396,6 +396,18 @@ config TOUCHSCREEN_ELAN To compile this driver as a module, choose M here: the module will be called elants_i2c. +config TOUCHSCREEN_EKTF2127 + tristate "Elan eKTF2127 I2C touchscreen" + depends on I2C + help + Say Y here if you have an Elan eKTF2127 touchscreen + connected to your system. + + If unsure, say N. + + To compile this driver as a module, choose M here: the + module will be called ektf2127. + config TOUCHSCREEN_ELO tristate "Elo serial touchscreens" select SERIO diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index 33b2eb8..db876ef 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -33,6 +33,7 @@ obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE) += hampshire.o obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunze.o obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o obj-$(CONFIG_TOUCHSCREEN_ELAN) += elants_i2c.o +obj-$(CONFIG_TOUCHSCREEN_EKTF2127) += ektf2127.o obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o obj-$(CONFIG_TOUCHSCREEN_EGALAX) += egalax_ts.o obj-$(CONFIG_TOUCHSCREEN_EGALAX_SERIAL) += egalax_ts_serial.o diff --git a/drivers/input/touchscreen/ektf2127.c b/drivers/input/touchscreen/ektf2127.c new file mode 100644 index 0000000..512a394 --- /dev/null +++ b/drivers/input/touchscreen/ektf2127.c @@ -0,0 +1,333 @@ +/* + * Driver for ELAN eKTF2127 i2c touchscreen controller + * + * For this driver the layout of the Chipone icn8318 i2c + * touchscreencontroller is used. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * Author: + * Michel Verlaan <michel.verl@xxxxxxxxx> + * Siebren Vroegindeweij <siebren.vroegindeweij@xxxxxxxxxxx> + * + * Original chipone_icn8318 driver: + * Hans de Goede <hdegoede@xxxxxxxxxx> + */ + +#include <linux/gpio/consumer.h> +#include <linux/interrupt.h> +#include <linux/i2c.h> +#include <linux/input.h> +#include <linux/input/mt.h> +#include <linux/input/touchscreen.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/delay.h> + +/* Packet header defines (first byte of data send / received) */ +#define EKTF2127_NOISE 0x40 +#define EKTF2127_RESPONSE 0x52 +#define EKTF2127_REQUEST 0x53 +#define EKTF2127_HELLO 0x55 +#define EKTF2127_REPORT 0x5d +#define EKTF2127_CALIB_DONE 0x66 + +/* Register deines (second byte of data send / received) */ +#define EKTF2127_ENV_NOISY 0x41 +#define EKTF2127_HEIGHT 0x60 +#define EKTF2127_WIDTH 0x63 + +/* 2 bytes header + 5 * 3 bytes coordinates + 3 bytes pressure info + footer */ +#define EKTF2127_TOUCH_REPORT_SIZE 21 +#define EKTF2127_MAX_TOUCHES 5 + +struct ektf2127_data { + struct i2c_client *client; + struct input_dev *input; + struct gpio_desc *power_gpios; + struct touchscreen_properties prop; +}; + +static void retrieve_coordinates(struct input_mt_pos *touches, + int touch_count, char *buf) +{ + int index = 0; + int i = 0; + + for (i = 0; i < touch_count; i++) { + index = 2 + i * 3; + + touches[i].x = (buf[index] & 0x0f); + touches[i].x <<= 8; + touches[i].x |= buf[index + 2]; + + touches[i].y = (buf[index] & 0xf0); + touches[i].y <<= 4; + touches[i].y |= buf[index + 1]; + } +} + +static irqreturn_t ektf2127_irq(int irq, void *dev_id) +{ + struct ektf2127_data *data = dev_id; + struct device *dev = &data->client->dev; + struct input_mt_pos touches[EKTF2127_MAX_TOUCHES]; + int touch_count; + int slots[EKTF2127_MAX_TOUCHES]; + char buff[EKTF2127_TOUCH_REPORT_SIZE]; + int i, ret; + + ret = i2c_master_recv(data->client, buff, EKTF2127_TOUCH_REPORT_SIZE); + if (ret != EKTF2127_TOUCH_REPORT_SIZE) { + dev_err(dev, "Error reading touch data\n"); + return IRQ_HANDLED; + } + + switch (buff[0]) { + case EKTF2127_REPORT: + /* Handled below */ + break; + case EKTF2127_NOISE: + if (buff[1] == EKTF2127_ENV_NOISY) + dev_dbg(dev, "Environment is electically noisy\n"); + return IRQ_HANDLED; + case EKTF2127_HELLO: + case EKTF2127_CALIB_DONE: + return IRQ_HANDLED; + default: + dev_err(dev, "Unexpected packet header byte %02x\n", buff[0]); + return IRQ_HANDLED; + } + + touch_count = buff[1] & 0x07; + + if (touch_count > EKTF2127_MAX_TOUCHES) { + dev_err(dev, "Too many touches %d > %d\n", + touch_count, EKTF2127_MAX_TOUCHES); + touch_count = EKTF2127_MAX_TOUCHES; + } + + retrieve_coordinates(touches, touch_count, buff); + input_mt_assign_slots(data->input, slots, touches, + touch_count, 0); + + for (i = 0; i < touch_count; i++) { + input_mt_slot(data->input, slots[i]); + input_mt_report_slot_state(data->input, MT_TOOL_FINGER, true); + touchscreen_report_pos(data->input, &data->prop, touches[i].x, + touches[i].y, true); + } + + input_mt_sync_frame(data->input); + input_sync(data->input); + + return IRQ_HANDLED; +} + +static int ektf2127_start(struct input_dev *dev) +{ + struct ektf2127_data *data = input_get_drvdata(dev); + + enable_irq(data->client->irq); + gpiod_set_value_cansleep(data->power_gpios, 1); + + return 0; +} + +static void ektf2127_stop(struct input_dev *dev) +{ + struct ektf2127_data *data = input_get_drvdata(dev); + + disable_irq(data->client->irq); + gpiod_set_value_cansleep(data->power_gpios, 0); +} + +static int ektf2127_suspend(struct device *dev) +{ + struct ektf2127_data *data = i2c_get_clientdata(to_i2c_client(dev)); + + mutex_lock(&data->input->mutex); + if (data->input->users) + ektf2127_stop(data->input); + mutex_unlock(&data->input->mutex); + + return 0; +} + +static int ektf2127_resume(struct device *dev) +{ + struct ektf2127_data *data = i2c_get_clientdata(to_i2c_client(dev)); + + mutex_lock(&data->input->mutex); + if (data->input->users) + ektf2127_start(data->input); + mutex_unlock(&data->input->mutex); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(ektf2127_pm_ops, ektf2127_suspend, + ektf2127_resume); + +static int ektf2127_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct device *dev = &client->dev; + struct ektf2127_data *data; + struct input_dev *input; + char buff[4]; + int error, max_x, max_y, ret = 0; + + if (!client->irq) { + dev_err(dev, "Error no irq specified\n"); + return -EINVAL; + } + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + /* This requests the gpio *and* turns on the touchscreen controller */ + data->power_gpios = devm_gpiod_get(dev, "power", GPIOD_OUT_HIGH); + if (IS_ERR(data->power_gpios)) { + error = PTR_ERR(data->power_gpios); + if (error != -EPROBE_DEFER) + dev_err(dev, "Error getting power gpio: %d\n", error); + return error; + } + + input = devm_input_allocate_device(dev); + if (!input) + return -ENOMEM; + + input->name = client->name; + input->id.bustype = BUS_I2C; + input->open = ektf2127_start; + input->close = ektf2127_stop; + + data->client = client; + + /* Read hello (ignore result, depends on initial power state) */ + msleep(20); + i2c_master_recv(data->client, buff, 4); + + /* Read resolution from chip */ + + /* Request width */ + buff[0] = EKTF2127_REQUEST; + buff[1] = EKTF2127_WIDTH; + buff[2] = 0x00; + buff[3] = 0x00; + ret = i2c_master_send(data->client, buff, 4); + if (ret != 4) { + dev_err(dev, "Error requesting width\n"); + return ret < 0 ? ret : -EIO; + } + + msleep(20); + + /* Read response */ + ret = i2c_master_recv(data->client, buff, 4); + if (ret != 4) { + dev_err(dev, "Error receiving width\n"); + return ret < 0 ? ret : -EIO; + } + + if ((buff[0] == EKTF2127_RESPONSE) && (buff[1] == EKTF2127_WIDTH)) { + max_x = (((buff[3] & 0xf0) << 4) | buff[2]) - 1; + } else { + dev_err(dev, "Error unexpected width data\n"); + return -EIO; + } + + /* Request height */ + buff[0] = EKTF2127_REQUEST; + buff[1] = EKTF2127_HEIGHT; + buff[2] = 0x00; + buff[3] = 0x00; + ret = i2c_master_send(data->client, buff, 4); + if (ret != 4) { + dev_err(dev, "Error requesting height\n"); + return ret < 0 ? ret : -EIO; + } + + msleep(20); + + /* Read response */ + ret = i2c_master_recv(data->client, buff, 4); + if (ret != 4) { + dev_err(dev, "Error receiving height\n"); + return ret < 0 ? ret : -EIO; + } + + if ((buff[0] == EKTF2127_RESPONSE) && (buff[1] == EKTF2127_HEIGHT)) { + max_y = (((buff[3] & 0xf0) << 4) | buff[2]) - 1; + } else { + dev_err(dev, "Error unexpected height data\n"); + return -EIO; + } + + input_set_abs_params(input, ABS_MT_POSITION_X, 0, max_x, 0, 0); + input_set_abs_params(input, ABS_MT_POSITION_Y, 0, max_y, 0, 0); + touchscreen_parse_properties(input, true, &data->prop); + + error = input_mt_init_slots(input, EKTF2127_MAX_TOUCHES, + INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED + | INPUT_MT_TRACK); + if (error) + return error; + + data->input = input; + input_set_drvdata(input, data); + + error = devm_request_threaded_irq(dev, client->irq, NULL, ektf2127_irq, + IRQF_ONESHOT, client->name, data); + if (error) { + dev_err(dev, "Error requesting irq: %d\n", error); + return error; + } + + /* Stop device till opened */ + ektf2127_stop(data->input); + + error = input_register_device(input); + if (error) + return error; + + i2c_set_clientdata(client, data); + + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id ektf2127_of_match[] = { + { .compatible = "elan,ektf2127" }, + {} +}; +MODULE_DEVICE_TABLE(of, ektf2127_of_match); +#endif + +static const struct i2c_device_id ektf2127_i2c_id[] = { + { "ektf2127", 0 }, + {} +}; +MODULE_DEVICE_TABLE(i2c, ektf2127_i2c_id); + +static struct i2c_driver ektf2127_driver = { + .driver = { + .name = "elan_ektf2127", + .pm = &ektf2127_pm_ops, + .of_match_table = of_match_ptr(ektf2127_of_match), + }, + .probe = ektf2127_probe, + .id_table = ektf2127_i2c_id, +}; + +module_i2c_driver(ektf2127_driver); + +MODULE_DESCRIPTION("ELAN eKTF2127 I2C Touchscreen Driver"); +MODULE_AUTHOR("Michel Verlaan, Siebren Vroegindeweij"); +MODULE_LICENSE("GPL"); -- 2.9.3 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html