forked from Minki/linux
Input: add driver for SiS 9200 family I2C touchscreen controllers
This is a driver for SiS 9200 family touchscreen controllers using I2C bus. Signed-off-by: Mika Penttilä <mika.penttila@nextfour.com> Acked-by: Tammy Tseng <tammy_tseng@sis.com> Acked-by: Yuger Yu <yuger_yu@sis.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Mika Penttilä
Dmitry Torokhov
parent
b27c0d0c3b
commit
a485cb037f
@ -0,0 +1,33 @@
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* SiS I2C Multiple Touch Controller
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Required properties:
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- compatible: must be "sis,9200-ts"
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- reg: i2c slave address
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- interrupt-parent: the phandle for the interrupt controller
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(see interrupt binding [0])
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- interrupts: touch controller interrupt (see interrupt
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binding [0])
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Optional properties:
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- pinctrl-names: should be "default" (see pinctrl binding [1]).
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- pinctrl-0: a phandle pointing to the pin settings for the
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device (see pinctrl binding [1]).
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- attn-gpios: the gpio pin used as attention line
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- reset-gpios: the gpio pin used to reset the controller
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- wakeup-source: touchscreen can be used as a wakeup source
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[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
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[1]: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
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Example:
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sis9255@5c {
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compatible = "sis,9200-ts";
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reg = <0x5c>;
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pinctrl-names = "default";
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pinctrl-0 = <&pinctrl_sis>;
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interrupt-parent = <&gpio3>;
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interrupts = <19 IRQ_TYPE_EDGE_FALLING>;
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irq-gpios = <&gpio3 19 GPIO_ACTIVE_LOW>;
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reset-gpios = <&gpio2 30 GPIO_ACTIVE_LOW>;
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};
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@ -221,6 +221,7 @@ simtek
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sii Seiko Instruments, Inc.
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silergy Silergy Corp.
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sirf SiRF Technology, Inc.
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sis Silicon Integrated Systems Corp.
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sitronix Sitronix Technology Corporation
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skyworks Skyworks Solutions, Inc.
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smsc Standard Microsystems Corporation
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@ -1071,6 +1071,18 @@ config TOUCHSCREEN_SILEAD
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To compile this driver as a module, choose M here: the
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module will be called silead.
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config TOUCHSCREEN_SIS_I2C
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tristate "SiS 9200 family I2C touchscreen"
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depends on I2C
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depends on GPIOLIB || COMPILE_TEST
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help
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This enables support for SiS 9200 family over I2C based 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 sis_i2c.
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config TOUCHSCREEN_ST1232
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tristate "Sitronix ST1232 touchscreen controllers"
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depends on I2C
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@ -65,6 +65,7 @@ obj-$(CONFIG_TOUCHSCREEN_PIXCIR) += pixcir_i2c_ts.o
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obj-$(CONFIG_TOUCHSCREEN_RM_TS) += raydium_i2c_ts.o
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obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o
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obj-$(CONFIG_TOUCHSCREEN_SILEAD) += silead.o
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obj-$(CONFIG_TOUCHSCREEN_SIS_I2C) += sis_i2c.o
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obj-$(CONFIG_TOUCHSCREEN_ST1232) += st1232.o
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obj-$(CONFIG_TOUCHSCREEN_STMPE) += stmpe-ts.o
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obj-$(CONFIG_TOUCHSCREEN_SUN4I) += sun4i-ts.o
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413
drivers/input/touchscreen/sis_i2c.c
Normal file
413
drivers/input/touchscreen/sis_i2c.c
Normal file
@ -0,0 +1,413 @@
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/*
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* Touch Screen driver for SiS 9200 family I2C Touch panels
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*
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* Copyright (C) 2015 SiS, Inc.
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* Copyright (C) 2016 Nextfour Group
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/crc-itu-t.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/input.h>
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#include <linux/input/mt.h>
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#include <linux/interrupt.h>
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#include <linux/gpio/consumer.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <asm/unaligned.h>
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#define SIS_I2C_NAME "sis_i2c_ts"
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/*
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* The I2C packet format:
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* le16 byte count
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* u8 Report ID
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* <contact data - variable length>
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* u8 Number of contacts
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* le16 Scan Time (optional)
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* le16 CRC
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*
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* One touch point information consists of 6+ bytes, the order is:
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* u8 contact state
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* u8 finger id
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* le16 x axis
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* le16 y axis
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* u8 contact width (optional)
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* u8 contact height (optional)
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* u8 pressure (optional)
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*
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* Maximum amount of data transmitted in one shot is 64 bytes, if controller
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* needs to report more contacts than fit in one packet it will send true
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* number of contacts in first packet and 0 as number of contacts in second
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* packet.
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*/
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#define SIS_MAX_PACKET_SIZE 64
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#define SIS_PKT_LEN_OFFSET 0
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#define SIS_PKT_REPORT_OFFSET 2 /* Report ID/type */
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#define SIS_PKT_CONTACT_OFFSET 3 /* First contact */
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#define SIS_SCAN_TIME_LEN 2
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/* Supported report types */
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#define SIS_ALL_IN_ONE_PACKAGE 0x10
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#define SIS_PKT_IS_TOUCH(x) (((x) & 0x0f) == 0x01)
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#define SIS_PKT_IS_HIDI2C(x) (((x) & 0x0f) == 0x06)
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/* Contact properties within report */
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#define SIS_PKT_HAS_AREA(x) ((x) & BIT(4))
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#define SIS_PKT_HAS_PRESSURE(x) ((x) & BIT(5))
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#define SIS_PKT_HAS_SCANTIME(x) ((x) & BIT(6))
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/* Contact size */
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#define SIS_BASE_LEN_PER_CONTACT 6
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#define SIS_AREA_LEN_PER_CONTACT 2
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#define SIS_PRESSURE_LEN_PER_CONTACT 1
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/* Offsets within contact data */
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#define SIS_CONTACT_STATUS_OFFSET 0
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#define SIS_CONTACT_ID_OFFSET 1 /* Contact ID */
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#define SIS_CONTACT_X_OFFSET 2
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#define SIS_CONTACT_Y_OFFSET 4
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#define SIS_CONTACT_WIDTH_OFFSET 6
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#define SIS_CONTACT_HEIGHT_OFFSET 7
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#define SIS_CONTACT_PRESSURE_OFFSET(id) (SIS_PKT_HAS_AREA(id) ? 8 : 6)
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/* Individual contact state */
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#define SIS_STATUS_UP 0x0
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#define SIS_STATUS_DOWN 0x3
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/* Touchscreen parameters */
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#define SIS_MAX_FINGERS 10
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#define SIS_MAX_X 4095
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#define SIS_MAX_Y 4095
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#define SIS_MAX_PRESSURE 255
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/* Resolution diagonal */
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#define SIS_AREA_LENGTH_LONGER 5792
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/*((SIS_MAX_X^2) + (SIS_MAX_Y^2))^0.5*/
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#define SIS_AREA_LENGTH_SHORT 5792
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#define SIS_AREA_UNIT (5792 / 32)
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struct sis_ts_data {
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struct i2c_client *client;
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struct input_dev *input;
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struct gpio_desc *attn_gpio;
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struct gpio_desc *reset_gpio;
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u8 packet[SIS_MAX_PACKET_SIZE];
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};
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static int sis_read_packet(struct i2c_client *client, u8 *buf,
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unsigned int *num_contacts,
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unsigned int *contact_size)
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{
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int count_idx;
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int ret;
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u16 len;
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u16 crc, pkg_crc;
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u8 report_id;
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ret = i2c_master_recv(client, buf, SIS_MAX_PACKET_SIZE);
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if (ret <= 0)
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return -EIO;
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len = get_unaligned_le16(&buf[SIS_PKT_LEN_OFFSET]);
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if (len > SIS_MAX_PACKET_SIZE) {
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dev_err(&client->dev,
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"%s: invalid packet length (%d vs %d)\n",
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__func__, len, SIS_MAX_PACKET_SIZE);
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return -E2BIG;
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}
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if (len < 10)
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return -EINVAL;
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report_id = buf[SIS_PKT_REPORT_OFFSET];
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count_idx = len - 1;
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*contact_size = SIS_BASE_LEN_PER_CONTACT;
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if (report_id != SIS_ALL_IN_ONE_PACKAGE) {
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if (SIS_PKT_IS_TOUCH(report_id)) {
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/*
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* Calculate CRC ignoring packet length
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* in the beginning and CRC transmitted
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* at the end of the packet.
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*/
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crc = crc_itu_t(0, buf + 2, len - 2 - 2);
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pkg_crc = get_unaligned_le16(&buf[len - 2]);
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if (crc != pkg_crc) {
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dev_err(&client->dev,
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"%s: CRC Error (%d vs %d)\n",
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__func__, crc, pkg_crc);
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return -EINVAL;
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}
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count_idx -= 2;
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} else if (!SIS_PKT_IS_HIDI2C(report_id)) {
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dev_err(&client->dev,
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"%s: invalid packet ID %#02x\n",
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__func__, report_id);
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return -EINVAL;
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}
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if (SIS_PKT_HAS_SCANTIME(report_id))
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count_idx -= SIS_SCAN_TIME_LEN;
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if (SIS_PKT_HAS_AREA(report_id))
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*contact_size += SIS_AREA_LEN_PER_CONTACT;
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if (SIS_PKT_HAS_PRESSURE(report_id))
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*contact_size += SIS_PRESSURE_LEN_PER_CONTACT;
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}
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*num_contacts = buf[count_idx];
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return 0;
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}
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static int sis_ts_report_contact(struct sis_ts_data *ts, const u8 *data, u8 id)
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{
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struct input_dev *input = ts->input;
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int slot;
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u8 status = data[SIS_CONTACT_STATUS_OFFSET];
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u8 pressure;
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u8 height, width;
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u16 x, y;
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if (status != SIS_STATUS_DOWN && status != SIS_STATUS_UP) {
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dev_err(&ts->client->dev, "Unexpected touch status: %#02x\n",
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data[SIS_CONTACT_STATUS_OFFSET]);
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return -EINVAL;
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}
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slot = input_mt_get_slot_by_key(input, data[SIS_CONTACT_ID_OFFSET]);
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if (slot < 0)
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return -ENOENT;
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input_mt_slot(input, slot);
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input_mt_report_slot_state(input, MT_TOOL_FINGER,
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status == SIS_STATUS_DOWN);
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if (status == SIS_STATUS_DOWN) {
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pressure = height = width = 1;
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if (id != SIS_ALL_IN_ONE_PACKAGE) {
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if (SIS_PKT_HAS_AREA(id)) {
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width = data[SIS_CONTACT_WIDTH_OFFSET];
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height = data[SIS_CONTACT_HEIGHT_OFFSET];
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}
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if (SIS_PKT_HAS_PRESSURE(id))
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pressure =
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data[SIS_CONTACT_PRESSURE_OFFSET(id)];
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}
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x = get_unaligned_le16(&data[SIS_CONTACT_X_OFFSET]);
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y = get_unaligned_le16(&data[SIS_CONTACT_Y_OFFSET]);
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input_report_abs(input, ABS_MT_TOUCH_MAJOR,
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width * SIS_AREA_UNIT);
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input_report_abs(input, ABS_MT_TOUCH_MINOR,
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height * SIS_AREA_UNIT);
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input_report_abs(input, ABS_MT_PRESSURE, pressure);
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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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return 0;
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}
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static void sis_ts_handle_packet(struct sis_ts_data *ts)
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{
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const u8 *contact;
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unsigned int num_to_report = 0;
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unsigned int num_contacts;
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unsigned int num_reported;
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unsigned int contact_size;
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int error;
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u8 report_id;
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do {
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error = sis_read_packet(ts->client, ts->packet,
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&num_contacts, &contact_size);
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if (error)
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break;
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if (num_to_report == 0) {
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num_to_report = num_contacts;
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} else if (num_contacts != 0) {
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dev_err(&ts->client->dev,
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"%s: nonzero (%d) point count in tail packet\n",
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__func__, num_contacts);
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break;
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}
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report_id = ts->packet[SIS_PKT_REPORT_OFFSET];
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contact = &ts->packet[SIS_PKT_CONTACT_OFFSET];
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num_reported = 0;
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while (num_to_report > 0) {
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error = sis_ts_report_contact(ts, contact, report_id);
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if (error)
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break;
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contact += contact_size;
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num_to_report--;
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num_reported++;
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if (report_id != SIS_ALL_IN_ONE_PACKAGE &&
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num_reported >= 5) {
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/*
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* The remainder of contacts is sent
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* in the 2nd packet.
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*/
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break;
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}
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}
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} while (num_to_report > 0);
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input_mt_sync_frame(ts->input);
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input_sync(ts->input);
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}
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static irqreturn_t sis_ts_irq_handler(int irq, void *dev_id)
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{
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struct sis_ts_data *ts = dev_id;
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do {
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sis_ts_handle_packet(ts);
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} while (ts->attn_gpio && gpiod_get_value_cansleep(ts->attn_gpio));
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return IRQ_HANDLED;
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}
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static void sis_ts_reset(struct sis_ts_data *ts)
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{
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if (ts->reset_gpio) {
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/* Get out of reset */
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usleep_range(1000, 2000);
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gpiod_set_value(ts->reset_gpio, 1);
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usleep_range(1000, 2000);
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gpiod_set_value(ts->reset_gpio, 0);
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msleep(100);
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}
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}
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static int sis_ts_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct sis_ts_data *ts;
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struct input_dev *input;
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int error;
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ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
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if (!ts)
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return -ENOMEM;
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ts->client = client;
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i2c_set_clientdata(client, ts);
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ts->attn_gpio = devm_gpiod_get_optional(&client->dev,
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"attn", GPIOD_IN);
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if (IS_ERR(ts->attn_gpio)) {
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error = PTR_ERR(ts->attn_gpio);
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if (error != -EPROBE_DEFER)
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dev_err(&client->dev,
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"Failed to get attention GPIO: %d\n", error);
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return error;
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}
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ts->reset_gpio = devm_gpiod_get_optional(&client->dev,
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"reset", GPIOD_OUT_LOW);
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if (IS_ERR(ts->reset_gpio)) {
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error = PTR_ERR(ts->reset_gpio);
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if (error != -EPROBE_DEFER)
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dev_err(&client->dev,
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"Failed to get reset GPIO: %d\n", error);
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return error;
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}
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sis_ts_reset(ts);
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ts->input = input = devm_input_allocate_device(&client->dev);
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if (!input) {
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dev_err(&client->dev, "Failed to allocate input device\n");
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return -ENOMEM;
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}
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input->name = "SiS Touchscreen";
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input->id.bustype = BUS_I2C;
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input_set_abs_params(input, ABS_MT_POSITION_X, 0, SIS_MAX_X, 0, 0);
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input_set_abs_params(input, ABS_MT_POSITION_Y, 0, SIS_MAX_Y, 0, 0);
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input_set_abs_params(input, ABS_MT_PRESSURE, 0, SIS_MAX_PRESSURE, 0, 0);
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input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
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0, SIS_AREA_LENGTH_LONGER, 0, 0);
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input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
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0, SIS_AREA_LENGTH_SHORT, 0, 0);
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error = input_mt_init_slots(input, SIS_MAX_FINGERS, INPUT_MT_DIRECT);
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if (error) {
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dev_err(&client->dev,
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"Failed to initialize MT slots: %d\n", error);
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return error;
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}
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error = devm_request_threaded_irq(&client->dev, client->irq,
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NULL, sis_ts_irq_handler,
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IRQF_ONESHOT,
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client->name, ts);
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if (error) {
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dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
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return error;
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}
|
||||
|
||||
error = input_register_device(ts->input);
|
||||
if (error) {
|
||||
dev_err(&client->dev,
|
||||
"Failed to register input device: %d\n", error);
|
||||
return error;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_OF
|
||||
static const struct of_device_id sis_ts_dt_ids[] = {
|
||||
{ .compatible = "sis,9200-ts" },
|
||||
{ /* sentinel */ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, sis_ts_dt_ids);
|
||||
#endif
|
||||
|
||||
static const struct i2c_device_id sis_ts_id[] = {
|
||||
{ SIS_I2C_NAME, 0 },
|
||||
{ "9200-ts", 0 },
|
||||
{ /* sentinel */ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, sis_ts_id);
|
||||
|
||||
static struct i2c_driver sis_ts_driver = {
|
||||
.driver = {
|
||||
.name = SIS_I2C_NAME,
|
||||
.of_match_table = of_match_ptr(sis_ts_dt_ids),
|
||||
},
|
||||
.probe = sis_ts_probe,
|
||||
.id_table = sis_ts_id,
|
||||
};
|
||||
module_i2c_driver(sis_ts_driver);
|
||||
|
||||
MODULE_DESCRIPTION("SiS 9200 Family Touchscreen Driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_AUTHOR("Mika Penttilä <mika.penttila@nextfour.com>");
|
||||
Loading…
Reference in New Issue
Block a user