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![Andi Shyti](/assets/img/avatar_default.png)
Because I will be leaving Samsung soon, for reachability update my reference e-mail to etezian.org. Signed-off-by: Andi Shyti <andi.shyti@samsung.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
554 lines
13 KiB
C
554 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Samsung S6SY761 Touchscreen device driver
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//
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// Copyright (c) 2017 Samsung Electronics Co., Ltd.
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// Copyright (c) 2017 Andi Shyti <andi@etezian.org>
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#include <asm/unaligned.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/input/mt.h>
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#include <linux/input/touchscreen.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/module.h>
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#include <linux/pm_runtime.h>
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#include <linux/regulator/consumer.h>
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/* commands */
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#define S6SY761_SENSE_ON 0x10
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#define S6SY761_SENSE_OFF 0x11
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#define S6SY761_TOUCH_FUNCTION 0x30 /* R/W for get/set */
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#define S6SY761_FIRMWARE_INTEGRITY 0x21
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#define S6SY761_PANEL_INFO 0x23
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#define S6SY761_DEVICE_ID 0x52
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#define S6SY761_BOOT_STATUS 0x55
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#define S6SY761_READ_ONE_EVENT 0x60
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#define S6SY761_READ_ALL_EVENT 0x61
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#define S6SY761_CLEAR_EVENT_STACK 0x62
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#define S6SY761_APPLICATION_MODE 0xe4
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/* events */
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#define S6SY761_EVENT_INFO 0x02
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#define S6SY761_EVENT_VENDOR_INFO 0x07
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/* info */
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#define S6SY761_INFO_BOOT_COMPLETE 0x00
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/* firmware status */
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#define S6SY761_FW_OK 0x80
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/*
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* the functionalities are put as a reference
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* as in the device I am using none of them
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* works therefore not used in this driver yet.
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*/
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/* touchscreen functionalities */
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#define S6SY761_MASK_TOUCH BIT(0)
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#define S6SY761_MASK_HOVER BIT(1)
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#define S6SY761_MASK_COVER BIT(2)
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#define S6SY761_MASK_GLOVE BIT(3)
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#define S6SY761_MASK_STYLUS BIT(4)
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#define S6SY761_MASK_PALM BIT(5)
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#define S6SY761_MASK_WET BIT(6)
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#define S6SY761_MASK_PROXIMITY BIT(7)
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/* boot status (BS) */
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#define S6SY761_BS_BOOT_LOADER 0x10
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#define S6SY761_BS_APPLICATION 0x20
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/* event id */
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#define S6SY761_EVENT_ID_COORDINATE 0x00
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#define S6SY761_EVENT_ID_STATUS 0x01
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/* event register masks */
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#define S6SY761_MASK_TOUCH_STATE 0xc0 /* byte 0 */
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#define S6SY761_MASK_TID 0x3c
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#define S6SY761_MASK_EID 0x03
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#define S6SY761_MASK_X 0xf0 /* byte 3 */
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#define S6SY761_MASK_Y 0x0f
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#define S6SY761_MASK_Z 0x3f /* byte 6 */
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#define S6SY761_MASK_LEFT_EVENTS 0x3f /* byte 7 */
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#define S6SY761_MASK_TOUCH_TYPE 0xc0 /* MSB in byte 6, LSB in byte 7 */
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/* event touch state values */
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#define S6SY761_TS_NONE 0x00
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#define S6SY761_TS_PRESS 0x01
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#define S6SY761_TS_MOVE 0x02
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#define S6SY761_TS_RELEASE 0x03
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/* application modes */
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#define S6SY761_APP_NORMAL 0x0
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#define S6SY761_APP_LOW_POWER 0x1
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#define S6SY761_APP_TEST 0x2
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#define S6SY761_APP_FLASH 0x3
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#define S6SY761_APP_SLEEP 0x4
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#define S6SY761_EVENT_SIZE 8
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#define S6SY761_EVENT_COUNT 32
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#define S6SY761_DEVID_SIZE 3
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#define S6SY761_PANEL_ID_SIZE 11
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#define S6SY761_TS_STATUS_SIZE 5
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#define S6SY761_MAX_FINGERS 10
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#define S6SY761_DEV_NAME "s6sy761"
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enum s6sy761_regulators {
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S6SY761_REGULATOR_VDD,
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S6SY761_REGULATOR_AVDD,
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};
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struct s6sy761_data {
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struct i2c_client *client;
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struct regulator_bulk_data regulators[2];
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struct input_dev *input;
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struct touchscreen_properties prop;
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u8 data[S6SY761_EVENT_SIZE * S6SY761_EVENT_COUNT];
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u16 devid;
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u8 tx_channel;
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};
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/*
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* We can't simply use i2c_smbus_read_i2c_block_data because we
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* need to read more than 255 bytes
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*/
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static int s6sy761_read_events(struct s6sy761_data *sdata, u16 n_events)
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{
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u8 cmd = S6SY761_READ_ALL_EVENT;
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struct i2c_msg msgs[2] = {
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{
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.addr = sdata->client->addr,
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.len = 1,
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.buf = &cmd,
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},
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{
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.addr = sdata->client->addr,
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.flags = I2C_M_RD,
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.len = (n_events * S6SY761_EVENT_SIZE),
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.buf = sdata->data + S6SY761_EVENT_SIZE,
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},
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};
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int ret;
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ret = i2c_transfer(sdata->client->adapter, msgs, ARRAY_SIZE(msgs));
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if (ret < 0)
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return ret;
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return ret == ARRAY_SIZE(msgs) ? 0 : -EIO;
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}
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static void s6sy761_report_coordinates(struct s6sy761_data *sdata,
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u8 *event, u8 tid)
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{
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u8 major = event[4];
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u8 minor = event[5];
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u8 z = event[6] & S6SY761_MASK_Z;
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u16 x = (event[1] << 3) | ((event[3] & S6SY761_MASK_X) >> 4);
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u16 y = (event[2] << 3) | (event[3] & S6SY761_MASK_Y);
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input_mt_slot(sdata->input, tid);
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input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, true);
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input_report_abs(sdata->input, ABS_MT_POSITION_X, x);
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input_report_abs(sdata->input, ABS_MT_POSITION_Y, y);
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input_report_abs(sdata->input, ABS_MT_TOUCH_MAJOR, major);
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input_report_abs(sdata->input, ABS_MT_TOUCH_MINOR, minor);
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input_report_abs(sdata->input, ABS_MT_PRESSURE, z);
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input_sync(sdata->input);
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}
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static void s6sy761_report_release(struct s6sy761_data *sdata,
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u8 *event, u8 tid)
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{
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input_mt_slot(sdata->input, tid);
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input_mt_report_slot_state(sdata->input, MT_TOOL_FINGER, false);
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input_sync(sdata->input);
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}
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static void s6sy761_handle_coordinates(struct s6sy761_data *sdata, u8 *event)
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{
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u8 tid;
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u8 touch_state;
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if (unlikely(!(event[0] & S6SY761_MASK_TID)))
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return;
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tid = ((event[0] & S6SY761_MASK_TID) >> 2) - 1;
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touch_state = (event[0] & S6SY761_MASK_TOUCH_STATE) >> 6;
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switch (touch_state) {
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case S6SY761_TS_NONE:
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break;
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case S6SY761_TS_RELEASE:
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s6sy761_report_release(sdata, event, tid);
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break;
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case S6SY761_TS_PRESS:
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case S6SY761_TS_MOVE:
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s6sy761_report_coordinates(sdata, event, tid);
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break;
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}
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}
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static void s6sy761_handle_events(struct s6sy761_data *sdata, u8 n_events)
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{
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int i;
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for (i = 0; i < n_events; i++) {
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u8 *event = &sdata->data[i * S6SY761_EVENT_SIZE];
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u8 event_id = event[0] & S6SY761_MASK_EID;
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if (!event[0])
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return;
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switch (event_id) {
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case S6SY761_EVENT_ID_COORDINATE:
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s6sy761_handle_coordinates(sdata, event);
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break;
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case S6SY761_EVENT_ID_STATUS:
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break;
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default:
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break;
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}
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}
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}
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static irqreturn_t s6sy761_irq_handler(int irq, void *dev)
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{
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struct s6sy761_data *sdata = dev;
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int ret;
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u8 n_events;
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ret = i2c_smbus_read_i2c_block_data(sdata->client,
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S6SY761_READ_ONE_EVENT,
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S6SY761_EVENT_SIZE,
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sdata->data);
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if (ret < 0) {
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dev_err(&sdata->client->dev, "failed to read events\n");
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return IRQ_HANDLED;
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}
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if (!sdata->data[0])
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return IRQ_HANDLED;
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n_events = sdata->data[7] & S6SY761_MASK_LEFT_EVENTS;
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if (unlikely(n_events > S6SY761_EVENT_COUNT - 1))
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return IRQ_HANDLED;
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if (n_events) {
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ret = s6sy761_read_events(sdata, n_events);
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if (ret < 0) {
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dev_err(&sdata->client->dev, "failed to read events\n");
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return IRQ_HANDLED;
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}
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}
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s6sy761_handle_events(sdata, n_events + 1);
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return IRQ_HANDLED;
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}
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static int s6sy761_input_open(struct input_dev *dev)
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{
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struct s6sy761_data *sdata = input_get_drvdata(dev);
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return i2c_smbus_write_byte(sdata->client, S6SY761_SENSE_ON);
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}
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static void s6sy761_input_close(struct input_dev *dev)
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{
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struct s6sy761_data *sdata = input_get_drvdata(dev);
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int ret;
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ret = i2c_smbus_write_byte(sdata->client, S6SY761_SENSE_OFF);
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if (ret)
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dev_err(&sdata->client->dev, "failed to turn off sensing\n");
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}
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static ssize_t s6sy761_sysfs_devid(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct s6sy761_data *sdata = dev_get_drvdata(dev);
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return sprintf(buf, "%#x\n", sdata->devid);
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}
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static DEVICE_ATTR(devid, 0444, s6sy761_sysfs_devid, NULL);
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static struct attribute *s6sy761_sysfs_attrs[] = {
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&dev_attr_devid.attr,
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NULL
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};
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static struct attribute_group s6sy761_attribute_group = {
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.attrs = s6sy761_sysfs_attrs
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};
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static int s6sy761_power_on(struct s6sy761_data *sdata)
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{
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u8 buffer[S6SY761_EVENT_SIZE];
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u8 event;
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int ret;
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ret = regulator_bulk_enable(ARRAY_SIZE(sdata->regulators),
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sdata->regulators);
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if (ret)
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return ret;
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msleep(140);
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/* double check whether the touch is functional */
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ret = i2c_smbus_read_i2c_block_data(sdata->client,
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S6SY761_READ_ONE_EVENT,
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S6SY761_EVENT_SIZE,
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buffer);
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if (ret < 0)
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return ret;
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event = (buffer[0] >> 2) & 0xf;
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if ((event != S6SY761_EVENT_INFO &&
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event != S6SY761_EVENT_VENDOR_INFO) ||
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buffer[1] != S6SY761_INFO_BOOT_COMPLETE) {
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return -ENODEV;
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}
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ret = i2c_smbus_read_byte_data(sdata->client, S6SY761_BOOT_STATUS);
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if (ret < 0)
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return ret;
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/* for some reasons the device might be stuck in the bootloader */
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if (ret != S6SY761_BS_APPLICATION)
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return -ENODEV;
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/* enable touch functionality */
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ret = i2c_smbus_write_word_data(sdata->client,
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S6SY761_TOUCH_FUNCTION,
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S6SY761_MASK_TOUCH);
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if (ret)
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return ret;
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return 0;
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}
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static int s6sy761_hw_init(struct s6sy761_data *sdata,
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unsigned int *max_x, unsigned int *max_y)
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{
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u8 buffer[S6SY761_PANEL_ID_SIZE]; /* larger read size */
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int ret;
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ret = s6sy761_power_on(sdata);
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if (ret)
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return ret;
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ret = i2c_smbus_read_i2c_block_data(sdata->client,
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S6SY761_DEVICE_ID,
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S6SY761_DEVID_SIZE,
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buffer);
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if (ret < 0)
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return ret;
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sdata->devid = get_unaligned_be16(buffer + 1);
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ret = i2c_smbus_read_i2c_block_data(sdata->client,
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S6SY761_PANEL_INFO,
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S6SY761_PANEL_ID_SIZE,
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buffer);
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if (ret < 0)
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return ret;
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*max_x = get_unaligned_be16(buffer);
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*max_y = get_unaligned_be16(buffer + 2);
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/* if no tx channels defined, at least keep one */
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sdata->tx_channel = max_t(u8, buffer[8], 1);
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ret = i2c_smbus_read_byte_data(sdata->client,
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S6SY761_FIRMWARE_INTEGRITY);
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if (ret < 0)
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return ret;
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else if (ret != S6SY761_FW_OK)
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return -ENODEV;
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return 0;
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}
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static void s6sy761_power_off(void *data)
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{
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struct s6sy761_data *sdata = data;
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disable_irq(sdata->client->irq);
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regulator_bulk_disable(ARRAY_SIZE(sdata->regulators),
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sdata->regulators);
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}
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static int s6sy761_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct s6sy761_data *sdata;
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unsigned int max_x, max_y;
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int err;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
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I2C_FUNC_SMBUS_BYTE_DATA |
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I2C_FUNC_SMBUS_I2C_BLOCK))
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return -ENODEV;
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sdata = devm_kzalloc(&client->dev, sizeof(*sdata), GFP_KERNEL);
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if (!sdata)
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return -ENOMEM;
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i2c_set_clientdata(client, sdata);
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sdata->client = client;
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sdata->regulators[S6SY761_REGULATOR_VDD].supply = "vdd";
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sdata->regulators[S6SY761_REGULATOR_AVDD].supply = "avdd";
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err = devm_regulator_bulk_get(&client->dev,
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ARRAY_SIZE(sdata->regulators),
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sdata->regulators);
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if (err)
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return err;
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err = devm_add_action_or_reset(&client->dev, s6sy761_power_off, sdata);
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if (err)
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return err;
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err = s6sy761_hw_init(sdata, &max_x, &max_y);
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if (err)
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return err;
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sdata->input = devm_input_allocate_device(&client->dev);
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if (!sdata->input)
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return -ENOMEM;
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sdata->input->name = S6SY761_DEV_NAME;
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sdata->input->id.bustype = BUS_I2C;
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sdata->input->open = s6sy761_input_open;
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sdata->input->close = s6sy761_input_close;
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input_set_abs_params(sdata->input, ABS_MT_POSITION_X, 0, max_x, 0, 0);
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input_set_abs_params(sdata->input, ABS_MT_POSITION_Y, 0, max_y, 0, 0);
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input_set_abs_params(sdata->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
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input_set_abs_params(sdata->input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
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input_set_abs_params(sdata->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
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input_set_abs_params(sdata->input, ABS_MT_TOUCH_MINOR, 0, 255, 0, 0);
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input_set_abs_params(sdata->input, ABS_MT_PRESSURE, 0, 255, 0, 0);
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touchscreen_parse_properties(sdata->input, true, &sdata->prop);
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if (!input_abs_get_max(sdata->input, ABS_X) ||
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!input_abs_get_max(sdata->input, ABS_Y)) {
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dev_warn(&client->dev, "the axis have not been set\n");
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}
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err = input_mt_init_slots(sdata->input, sdata->tx_channel,
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INPUT_MT_DIRECT);
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if (err)
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return err;
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input_set_drvdata(sdata->input, sdata);
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err = input_register_device(sdata->input);
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if (err)
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return err;
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err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
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s6sy761_irq_handler,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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"s6sy761_irq", sdata);
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if (err)
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return err;
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err = devm_device_add_group(&client->dev, &s6sy761_attribute_group);
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if (err)
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return err;
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pm_runtime_enable(&client->dev);
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return 0;
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}
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static int s6sy761_remove(struct i2c_client *client)
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{
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pm_runtime_disable(&client->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused s6sy761_runtime_suspend(struct device *dev)
|
|
{
|
|
struct s6sy761_data *sdata = dev_get_drvdata(dev);
|
|
|
|
return i2c_smbus_write_byte_data(sdata->client,
|
|
S6SY761_APPLICATION_MODE, S6SY761_APP_SLEEP);
|
|
}
|
|
|
|
static int __maybe_unused s6sy761_runtime_resume(struct device *dev)
|
|
{
|
|
struct s6sy761_data *sdata = dev_get_drvdata(dev);
|
|
|
|
return i2c_smbus_write_byte_data(sdata->client,
|
|
S6SY761_APPLICATION_MODE, S6SY761_APP_NORMAL);
|
|
}
|
|
|
|
static int __maybe_unused s6sy761_suspend(struct device *dev)
|
|
{
|
|
struct s6sy761_data *sdata = dev_get_drvdata(dev);
|
|
|
|
s6sy761_power_off(sdata);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused s6sy761_resume(struct device *dev)
|
|
{
|
|
struct s6sy761_data *sdata = dev_get_drvdata(dev);
|
|
|
|
enable_irq(sdata->client->irq);
|
|
|
|
return s6sy761_power_on(sdata);
|
|
}
|
|
|
|
static const struct dev_pm_ops s6sy761_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(s6sy761_suspend, s6sy761_resume)
|
|
SET_RUNTIME_PM_OPS(s6sy761_runtime_suspend,
|
|
s6sy761_runtime_resume, NULL)
|
|
};
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id s6sy761_of_match[] = {
|
|
{ .compatible = "samsung,s6sy761", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, s6sy761_of_match);
|
|
#endif
|
|
|
|
static const struct i2c_device_id s6sy761_id[] = {
|
|
{ "s6sy761", 0 },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, s6sy761_id);
|
|
|
|
static struct i2c_driver s6sy761_driver = {
|
|
.driver = {
|
|
.name = S6SY761_DEV_NAME,
|
|
.of_match_table = of_match_ptr(s6sy761_of_match),
|
|
.pm = &s6sy761_pm_ops,
|
|
},
|
|
.probe = s6sy761_probe,
|
|
.remove = s6sy761_remove,
|
|
.id_table = s6sy761_id,
|
|
};
|
|
|
|
module_i2c_driver(s6sy761_driver);
|
|
|
|
MODULE_AUTHOR("Andi Shyti <andi.shyti@samsung.com>");
|
|
MODULE_DESCRIPTION("Samsung S6SY761 Touch Screen");
|
|
MODULE_LICENSE("GPL v2");
|