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input: Add support for Intel Precise Touch & Stylus
Signed-off-by: Dorian Stoll <dorian.stoll@tmsp.io>
1 parent 9c75074 commit 5f47814

29 files changed

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‎drivers/input/touchscreen/Kconfig‎

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@@ -1310,4 +1310,6 @@ config TOUCHSCREEN_IQS5XX
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To compile this driver as a module, choose M here: the
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module will be called iqs5xx.
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source "drivers/input/touchscreen/ipts/Kconfig"
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endif

‎drivers/input/touchscreen/Makefile‎

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@@ -45,6 +45,7 @@ obj-$(CONFIG_TOUCHSCREEN_EXC3000) += exc3000.o
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obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
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obj-$(CONFIG_TOUCHSCREEN_GOODIX) += goodix.o
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obj-$(CONFIG_TOUCHSCREEN_HIDEEP) += hideep.o
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obj-$(CONFIG_TOUCHSCREEN_IPTS) += ipts/
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obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o
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obj-$(CONFIG_TOUCHSCREEN_IMX6UL_TSC) += imx6ul_tsc.o
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obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o

‎drivers/input/touchscreen/ipts/Kconfig‎

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# SPDX-License-Identifier: GPL-2.0-or-later
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config TOUCHSCREEN_IPTS
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tristate "Intel Precise Touch & Stylus"
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select INTEL_MEI
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depends on X86
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depends on PCI
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depends on HID
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help
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Say Y here if your system has a touchscreen using Intels
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Precise Touch & Stylus (IPTS).
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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 ipts.

‎drivers/input/touchscreen/ipts/Makefile‎

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# SPDX-License-Identifier: GPL-2.0-or-later
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#
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# Makefile for the IPTS touchscreen driver
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#
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obj-$(CONFIG_TOUCHSCREEN_IPTS) += ipts.o
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ipts-objs := control.o
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ipts-objs += devices.o
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ipts-objs += hid.o
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ipts-objs += init.o
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ipts-objs += math.o
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ipts-objs += params.o
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ipts-objs += receiver.o
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ipts-objs += resources.o
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ipts-objs += singletouch.o
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ipts-objs += stylus.o

‎drivers/input/touchscreen/ipts/context.h‎

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/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _IPTS_CONTEXT_H_
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#define _IPTS_CONTEXT_H_
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#include <linux/kthread.h>
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#include <linux/input.h>
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#include <linux/mei_cl_bus.h>
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#include <linux/types.h>
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#include "devices.h"
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#include "protocol/enums.h"
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#include "protocol/responses.h"
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/*
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* IPTS driver states
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*/
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enum ipts_host_status {
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IPTS_HOST_STATUS_NONE,
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IPTS_HOST_STATUS_INIT,
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IPTS_HOST_STATUS_RESOURCE_READY,
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IPTS_HOST_STATUS_STARTED,
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IPTS_HOST_STATUS_STOPPING,
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IPTS_HOST_STATUS_RESTARTING
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};
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struct ipts_buffer_info {
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u32 size;
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u8 *address;
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dma_addr_t dma_address;
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};
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struct ipts_context {
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struct mei_cl_device *client_dev;
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struct device *dev;
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struct ipts_device_info device_info;
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struct ipts_device_config device_cfg;
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enum ipts_host_status status;
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enum ipts_sensor_mode mode;
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struct ipts_buffer_info touch_data[16];
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struct ipts_buffer_info feedback[16];
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struct ipts_buffer_info doorbell;
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/*
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* These buffers are not actually used by anything, but they need
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* to be allocated and passed to the ME to get proper functionality.
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*/
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struct ipts_buffer_info workqueue;
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struct ipts_buffer_info host2me;
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struct task_struct *receiver_loop;
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struct task_struct *hid_loop;
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struct input_dev *stylus;
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struct input_dev *singletouch;
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u16 stylus_tool;
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};
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#endif /* _IPTS_CONTEXT_H_ */

‎drivers/input/touchscreen/ipts/control.c‎

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// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/mei_cl_bus.h>
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#include <linux/types.h>
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#include "context.h"
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#include "params.h"
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#include "protocol/commands.h"
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#include "protocol/enums.h"
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#include "protocol/events.h"
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#include "protocol/touch.h"
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#include "resources.h"
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int ipts_control_send(struct ipts_context *ipts,
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u32 cmd, void *data, u32 size)
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{
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int ret;
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struct ipts_command msg;
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memset(&msg, 0, sizeof(struct ipts_command));
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msg.code = cmd;
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// Copy message payload
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if (data && size > 0)
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memcpy(&msg.data, data, size);
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ret = mei_cldev_send(ipts->client_dev, (u8 *)&msg,
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sizeof(msg.code) + size);
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if (ret < 0) {
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dev_err(ipts->dev, "%s: error 0x%X:%d\n", __func__, cmd, ret);
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return ret;
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}
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return 0;
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}
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int ipts_control_send_feedback(struct ipts_context *ipts,
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u32 buffer, u32 transaction)
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{
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struct ipts_buffer_info feedback_buffer;
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struct ipts_feedback *feedback;
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struct ipts_feedback_cmd cmd;
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feedback_buffer = ipts->feedback[buffer];
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feedback = (struct ipts_feedback *)feedback_buffer.address;
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memset(feedback, 0, sizeof(struct ipts_feedback));
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memset(&cmd, 0, sizeof(struct ipts_feedback_cmd));
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feedback->type = IPTS_FEEDBACK_TYPE_NONE;
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feedback->transaction = transaction;
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cmd.buffer = buffer;
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cmd.transaction = transaction;
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return ipts_control_send(ipts, IPTS_CMD(FEEDBACK),
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&cmd, sizeof(struct ipts_feedback_cmd));
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}
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int ipts_control_start(struct ipts_context *ipts)
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{
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ipts->status = IPTS_HOST_STATUS_INIT;
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if (ipts_params.singletouch)
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ipts->mode = IPTS_SENSOR_MODE_SINGLETOUCH;
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else
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ipts->mode = IPTS_SENSOR_MODE_MULTITOUCH;
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return ipts_control_send(ipts, IPTS_CMD(NOTIFY_DEV_READY), NULL, 0);
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}
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void ipts_control_stop(struct ipts_context *ipts)
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{
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enum ipts_host_status old_status = ipts->status;
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ipts->status = IPTS_HOST_STATUS_STOPPING;
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ipts_control_send(ipts, IPTS_CMD(QUIESCE_IO), NULL, 0);
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ipts_control_send(ipts, IPTS_CMD(CLEAR_MEM_WINDOW), NULL, 0);
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if (old_status < IPTS_HOST_STATUS_RESOURCE_READY)
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return;
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ipts_resources_free(ipts);
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}
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int ipts_control_restart(struct ipts_context *ipts)
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{
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dev_info(ipts->dev, "Restarting IPTS\n");
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ipts_control_stop(ipts);
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ipts->status = IPTS_HOST_STATUS_RESTARTING;
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return ipts_control_send(ipts, IPTS_CMD(QUIESCE_IO), NULL, 0);
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}

‎drivers/input/touchscreen/ipts/control.h‎

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/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _IPTS_CONTROL_H_
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#define _IPTS_CONTROL_H_
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#include <linux/types.h>
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#include "context.h"
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int ipts_control_start(struct ipts_context *ipts);
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void ipts_control_stop(struct ipts_context *ipts);
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int ipts_control_restart(struct ipts_context *ipts);
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int ipts_control_send(struct ipts_context *ipts,
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u32 cmd, void *data, u32 size);
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int ipts_control_send_feedback(struct ipts_context *ipts,
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u32 buffer, u32 transaction);
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#endif /* _IPTS_CONTROL_H_ */

‎drivers/input/touchscreen/ipts/devices.c‎

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// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include "devices.h"
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static const struct ipts_device_config ipts_devices[] = {
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{
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.vendor_id = 0x1B96,
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.device_id = 0x006A,
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.max_stylus_pressure = 1024,
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.stylus_protocol = IPTS_STYLUS_PROTOCOL_GEN1,
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},
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{
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.vendor_id = 0x1B96,
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.device_id = 0x005e,
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.max_stylus_pressure = 1024,
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.stylus_protocol = IPTS_STYLUS_PROTOCOL_GEN1,
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},
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};
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struct ipts_device_config ipts_devices_get_config(u32 vendor, u32 device)
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{
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int i;
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struct ipts_device_config cfg;
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for (i = 0; i < ARRAY_SIZE(ipts_devices); i++) {
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cfg = ipts_devices[i];
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if (cfg.vendor_id != vendor)
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continue;
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if (cfg.device_id != device)
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continue;
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return cfg;
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}
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// No device was found, so return a default config
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cfg.vendor_id = vendor;
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cfg.device_id = device;
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cfg.max_stylus_pressure = 4096;
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cfg.stylus_protocol = IPTS_STYLUS_PROTOCOL_GEN2;
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return cfg;
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}

‎drivers/input/touchscreen/ipts/devices.h‎

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/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _IPTS_DEVICES_H_
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#define _IPTS_DEVICES_H_
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#include <linux/types.h>
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/*
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* These names describe the different iterations of the IPTS stylus protocol.
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*
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* IPTS_STYLUS_PROTOCOL_GEN1 can be found on devices that don't have
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* support for tilt, and only 1024 pressure levels. (Using NTRIG digitizers)
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*
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* IPTS_STYLUS_PROTOCOL_GEN2 can be found on devices that support tilting
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* the stylus, with 4096 levels of pressure. (Using MS digitizers)
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*
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* New generations have to be added as they are discovered.
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*/
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enum ipts_stylus_protocol {
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IPTS_STYLUS_PROTOCOL_GEN1,
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IPTS_STYLUS_PROTOCOL_GEN2
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};
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struct ipts_device_config {
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u32 vendor_id;
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u32 device_id;
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u32 max_stylus_pressure;
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enum ipts_stylus_protocol stylus_protocol;
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};
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struct ipts_device_config ipts_devices_get_config(u32 vendor, u32 device);
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#endif /* _IPTS_DEVICES_H_ */

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