// SPDX-License-Identifier: GPL-2.0-only/* * Copyright (C) 2012-2013 MundoReader S.L. * Author: Heiko Stuebner <heiko@sntech.de> * * based in parts on Nook zforce driver * * Copyright (C) 2010 Barnes & Noble, Inc. * Author: Pieter Truter<ptruter@intrinsyc.com> */ #include <linux/delay.h>#include <linux/device.h>#include <linux/gpio/consumer.h>#include <linux/i2c.h>#include <linux/input.h>#include <linux/input/mt.h>#include <linux/input/touchscreen.h>#include <linux/interrupt.h>#include <linux/module.h>#include <linux/of.h>#include <linux/property.h>#include <linux/regulator/consumer.h>#include <linux/slab.h>#include <linux/unaligned.h> #define WAIT_TIMEOUT msecs_to_jiffies(1000) #define FRAME_START 0xee#define FRAME_MAXSIZE 257 /* Offsets of the different parts of the payload the controller sends */#define PAYLOAD_HEADER 0#define PAYLOAD_LENGTH 1#define PAYLOAD_BODY 2 /* Response offsets */#define RESPONSE_ID 0#define RESPONSE_DATA 1 /* Commands */#define COMMAND_DEACTIVATE 0x00#define COMMAND_INITIALIZE 0x01#define COMMAND_RESOLUTION 0x02#define COMMAND_SETCONFIG 0x03#define COMMAND_DATAREQUEST 0x04#define COMMAND_SCANFREQ 0x08#define COMMAND_STATUS 0X1e /* * Responses the controller sends as a result of * command requests */#define RESPONSE_DEACTIVATE 0x00#define RESPONSE_INITIALIZE 0x01#define RESPONSE_RESOLUTION 0x02#define RESPONSE_SETCONFIG 0x03#define RESPONSE_SCANFREQ 0x08#define RESPONSE_STATUS 0X1e /* * Notifications are sent by the touch controller without * being requested by the driver and include for example * touch indications */#define NOTIFICATION_TOUCH 0x04#define NOTIFICATION_BOOTCOMPLETE 0x07#define NOTIFICATION_OVERRUN 0x25#define NOTIFICATION_PROXIMITY 0x26#define NOTIFICATION_INVALID_COMMAND 0xfe #define ZFORCE_REPORT_POINTS 2#define ZFORCE_MAX_AREA 0xff #define STATE_DOWN 0#define STATE_MOVE 1#define STATE_UP 2 #define SETCONFIG_DUALTOUCH (1 << 0) struct zforce_point { int coord_x; int coord_y; int state; int id; int area_major; int area_minor; int orientation; int pressure; int prblty;}; /* * @client the i2c_client * @input the input device * @suspending in the process of going to suspend (don't emit wakeup * events for commands executed to suspend the device) * @suspended device suspended * @command_done completion to wait for the command result * @command_waiting the id of the command that is currently waiting * for a result * @command_result returned result of the command */struct zforce_ts { struct i2c_client *client; struct input_dev *input; struct touchscreen_properties prop; char phys[32]; struct gpio_desc *gpio_int; struct gpio_desc *gpio_rst; bool suspending; bool suspended; bool boot_complete; /* Firmware version information */ u16 version_major; u16 version_minor; u16 version_build; u16 version_rev; struct completion command_done; int command_waiting; int command_result;}; static int zforce_command(struct zforce_ts *ts, u8 cmd){ struct i2c_client *client = ts->client; char buf[3]; int ret; dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd); buf[0] = FRAME_START; buf[1] = 1; /* data size, command only */ buf[2] = cmd; ret = i2c_master_send(client, &buf[0], ARRAY_SIZE(buf)); if (ret < 0) { dev_err(&client->dev, "i2c send data request error: %d\n", ret); return ret; } return 0;} static int zforce_send_wait(struct zforce_ts *ts, const char *buf, int len){ struct i2c_client *client = ts->client; int ret; dev_dbg(&client->dev, "sending %d bytes for command 0x%x\n", buf[1], buf[2]); ts->command_waiting = buf[2]; ret = i2c_master_send(client, buf, len); if (ret < 0) { dev_err(&client->dev, "i2c send data request error: %d\n", ret); return ret; } dev_dbg(&client->dev, "waiting for result for command 0x%x\n", buf[2]); if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0) return -ETIME; ret = ts->command_result; return 0;} static int zforce_command_wait(struct zforce_ts *ts, u8 cmd){ struct i2c_client *client = ts->client; char buf[3]; int error; dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd); buf[0] = FRAME_START; buf[1] = 1; /* data size, command only */ buf[2] = cmd; error = zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); if (error) { dev_err(&client->dev, "i2c send data request error: %d\n", error); return error; } return 0;} static int zforce_resolution(struct zforce_ts *ts, u16 x, u16 y){ struct i2c_client *client = ts->client; char buf[7] = { FRAME_START, 5, COMMAND_RESOLUTION, (x & 0xff), ((x >> 8) & 0xff), (y & 0xff), ((y >> 8) & 0xff) }; dev_dbg(&client->dev, "set resolution to (%d,%d)\n", x, y); return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));} static int zforce_scan_frequency(struct zforce_ts *ts, u16 idle, u16 finger, u16 stylus){ struct i2c_client *client = ts->client; char buf[9] = { FRAME_START, 7, COMMAND_SCANFREQ, (idle & 0xff), ((idle >> 8) & 0xff), (finger & 0xff), ((finger >> 8) & 0xff), (stylus & 0xff), ((stylus >> 8) & 0xff) }; dev_dbg(&client->dev, "set scan frequency to (idle: %d, finger: %d, stylus: %d)\n", idle, finger, stylus); return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));} static int zforce_setconfig(struct zforce_ts *ts, char b1){ struct i2c_client *client = ts->client; char buf[7] = { FRAME_START, 5, COMMAND_SETCONFIG, b1, 0, 0, 0 }; dev_dbg(&client->dev, "set config to (%d)\n", b1); return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf));} static int zforce_start(struct zforce_ts *ts){ struct i2c_client *client = ts->client; int error; dev_dbg(&client->dev, "starting device\n"); error = zforce_command_wait(ts, COMMAND_INITIALIZE); if (error) { dev_err(&client->dev, "Unable to initialize, %d\n", error); return error; } error = zforce_resolution(ts, ts->prop.max_x, ts->prop.max_y); if (error) { dev_err(&client->dev, "Unable to set resolution, %d\n", error); goto err_deactivate; } error = zforce_scan_frequency(ts, 10, 50, 50); if (error) { dev_err(&client->dev, "Unable to set scan frequency, %d\n", error); goto err_deactivate; } error = zforce_setconfig(ts, SETCONFIG_DUALTOUCH); if (error) { dev_err(&client->dev, "Unable to set config\n"); goto err_deactivate; } /* start sending touch events */ error = zforce_command(ts, COMMAND_DATAREQUEST); if (error) { dev_err(&client->dev, "Unable to request data\n"); goto err_deactivate; } /* * Per NN, initial cal. take max. of 200msec. * Allow time to complete this calibration */ msleep(200); return 0; err_deactivate: zforce_command_wait(ts, COMMAND_DEACTIVATE); return error;} static int zforce_stop(struct zforce_ts *ts){ struct i2c_client *client = ts->client; int error; dev_dbg(&client->dev, "stopping device\n"); /* Deactivates touch sensing and puts the device into sleep. */ error = zforce_command_wait(ts, COMMAND_DEACTIVATE); if (error) { dev_err(&client->dev, "could not deactivate device, %d\n", error); return error; } return 0;} static int zforce_touch_event(struct zforce_ts *ts, u8 *payload){ struct i2c_client *client = ts->client; struct zforce_point point; int count, i, num = 0; u8 *p; count = payload[0]; if (count > ZFORCE_REPORT_POINTS) { dev_warn(&client->dev, "too many coordinates %d, expected max %d\n", count, ZFORCE_REPORT_POINTS); count = ZFORCE_REPORT_POINTS; } for (i = 0; i < count; i++) { p = &payload[i * 9 + 1]; point.coord_x = get_unaligned_le16(&p[0]); point.coord_y = get_unaligned_le16(&p[2]); if (point.coord_x > ts->prop.max_x || point.coord_y > ts->prop.max_y) { dev_warn(&client->dev, "coordinates (%d,%d) invalid\n", point.coord_x, point.coord_y); point.coord_x = point.coord_y = 0; } point.state = p[4] & 0x0f; point.id = (p[4] & 0xf0) >> 4; /* determine touch major, minor and orientation */ point.area_major = max(p[5], p[6]); point.area_minor = min(p[5], p[6]); point.orientation = p[5] > p[6]; point.pressure = p[7]; point.prblty = p[8]; dev_dbg(&client->dev, "point %d/%d: state %d, id %d, pressure %d, prblty %d, x %d, y %d, amajor %d, aminor %d, ori %d\n", i, count, point.state, point.id, point.pressure, point.prblty, point.coord_x, point.coord_y, point.area_major, point.area_minor, point.orientation); /* the zforce id starts with "1", so needs to be decreased */ input_mt_slot(ts->input, point.id - 1); if (input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, point.state != STATE_UP)) { touchscreen_report_pos(ts->input, &ts->prop, point.coord_x, point.coord_y, true); input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, point.area_major); input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, point.area_minor); input_report_abs(ts->input, ABS_MT_ORIENTATION, point.orientation); num++; } } input_mt_sync_frame(ts->input); input_mt_report_finger_count(ts->input, num); input_sync(ts->input); return 0;} static int zforce_read_packet(struct zforce_ts *ts, u8 *buf){ struct i2c_client *client = ts->client; int ret; /* read 2 byte message header */ ret = i2c_master_recv(client, buf, 2); if (ret < 0) { dev_err(&client->dev, "error reading header: %d\n", ret); return ret; } if (buf[PAYLOAD_HEADER] != FRAME_START) { dev_err(&client->dev, "invalid frame start: %d\n", buf[0]); return -EIO; } if (buf[PAYLOAD_LENGTH] == 0) { dev_err(&client->dev, "invalid payload length: %d\n", buf[PAYLOAD_LENGTH]); return -EIO; } /* read the message */ ret = i2c_master_recv(client, &buf[PAYLOAD_BODY], buf[PAYLOAD_LENGTH]); if (ret < 0) { dev_err(&client->dev, "error reading payload: %d\n", ret); return ret; } dev_dbg(&client->dev, "read %d bytes for response command 0x%x\n", buf[PAYLOAD_LENGTH], buf[PAYLOAD_BODY]); return 0;} static void zforce_complete(struct zforce_ts *ts, int cmd, int result){ struct i2c_client *client = ts->client; if (ts->command_waiting == cmd) { dev_dbg(&client->dev, "completing command 0x%x\n", cmd); ts->command_result = result; complete(&ts->command_done); } else { dev_dbg(&client->dev, "command %d not for us\n", cmd); }} static irqreturn_t zforce_irq(int irq, void *dev_id){ struct zforce_ts *ts = dev_id; struct i2c_client *client = ts->client; if (ts->suspended && device_may_wakeup(&client->dev)) pm_wakeup_event(&client->dev, 500); return IRQ_WAKE_THREAD;} static irqreturn_t zforce_irq_thread(int irq, void *dev_id){ struct zforce_ts *ts = dev_id; struct i2c_client *client = ts->client; int error; u8 payload_buffer[FRAME_MAXSIZE]; u8 *payload; bool suspending; /* * When still suspended, return. * Due to the level-interrupt we will get re-triggered later. */ if (ts->suspended) { msleep(20); return IRQ_HANDLED; } dev_dbg(&client->dev, "handling interrupt\n"); /* Don't emit wakeup events from commands run by zforce_suspend */ suspending = READ_ONCE(ts->suspending); if (!suspending && device_may_wakeup(&client->dev)) pm_stay_awake(&client->dev); /* * Run at least once and exit the loop if * - the optional interrupt GPIO isn't specified * (there is only one packet read per ISR invocation, then) * or * - the GPIO isn't active any more * (packet read until the level GPIO indicates that there is * no IRQ any more) */ do { error = zforce_read_packet(ts, payload_buffer); if (error) { dev_err(&client->dev, "could not read packet, ret: %d\n", error); break; } payload = &payload_buffer[PAYLOAD_BODY]; switch (payload[RESPONSE_ID]) { case NOTIFICATION_TOUCH: /* * Always report touch-events received while * suspending, when being a wakeup source */ if (suspending && device_may_wakeup(&client->dev)) pm_wakeup_event(&client->dev, 500); zforce_touch_event(ts, &payload[RESPONSE_DATA]); break; case NOTIFICATION_BOOTCOMPLETE: ts->boot_complete = payload[RESPONSE_DATA]; zforce_complete(ts, payload[RESPONSE_ID], 0); break; case RESPONSE_INITIALIZE: case RESPONSE_DEACTIVATE:Lines 1–500 of 862. 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// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2012-2013 MundoReader S.L. * Author: Heiko Stuebner <heiko@sntech.de> * * based in parts on Nook zforce driver * * Copyright (C) 2010 Barnes & Noble, Inc. * Author: Pieter Truter<ptruter@intrinsyc.com> */ #include <linux/delay.h> #include <linux/device.h> #include <linux/gpio/consumer.h> #include <linux/i2c.h> #include <linux/input.h> #include <linux/input/mt.h> #include <linux/input/touchscreen.h> #include <linux/interrupt.h> #include <linux/module.h> #include <linux/of.h> #include <linux/property.h> #include <linux/regulator/consumer.h> #include <linux/slab.h> #include <linux/unaligned.h> #define WAIT_TIMEOUT msecs_to_jiffies(1000) #define FRAME_START 0xee #define FRAME_MAXSIZE 257 /* Offsets of the different parts of the payload the controller sends */ #define PAYLOAD_HEADER 0 #define PAYLOAD_LENGTH 1 #define PAYLOAD_BODY 2 /* Response offsets */ #define RESPONSE_ID 0 #define RESPONSE_DATA 1 /* Commands */ #define COMMAND_DEACTIVATE 0x00 #define COMMAND_INITIALIZE 0x01 #define COMMAND_RESOLUTION 0x02 #define COMMAND_SETCONFIG 0x03 #define COMMAND_DATAREQUEST 0x04 #define COMMAND_SCANFREQ 0x08 #define COMMAND_STATUS 0X1e /* * Responses the controller sends as a result of * command requests */ #define RESPONSE_DEACTIVATE 0x00 #define RESPONSE_INITIALIZE 0x01 #define RESPONSE_RESOLUTION 0x02 #define RESPONSE_SETCONFIG 0x03 #define RESPONSE_SCANFREQ 0x08 #define RESPONSE_STATUS 0X1e /* * Notifications are sent by the touch controller without * being requested by the driver and include for example * touch indications */ #define NOTIFICATION_TOUCH 0x04 #define NOTIFICATION_BOOTCOMPLETE 0x07 #define NOTIFICATION_OVERRUN 0x25 #define NOTIFICATION_PROXIMITY 0x26 #define NOTIFICATION_INVALID_COMMAND 0xfe #define ZFORCE_REPORT_POINTS 2 #define ZFORCE_MAX_AREA 0xff #define STATE_DOWN 0 #define STATE_MOVE 1 #define STATE_UP 2 #define SETCONFIG_DUALTOUCH (1 << 0) struct zforce_point { int coord_x; int coord_y; int state; int id; int area_major; int area_minor; int orientation; int pressure; int prblty; }; /* * @client the i2c_client * @input the input device * @suspending in the process of going to suspend (don't emit wakeup * events for commands executed to suspend the device) * @suspended device suspended * @command_done completion to wait for the command result * @command_waiting the id of the command that is currently waiting * for a result * @command_result returned result of the command */ struct zforce_ts { struct i2c_client *client; struct input_dev *input; struct touchscreen_properties prop; char phys[32]; struct gpio_desc *gpio_int; struct gpio_desc *gpio_rst; bool suspending; bool suspended; bool boot_complete; /* Firmware version information */ u16 version_major; u16 version_minor; u16 version_build; u16 version_rev; struct completion command_done; int command_waiting; int command_result; }; static int zforce_command(struct zforce_ts *ts, u8 cmd) { struct i2c_client *client = ts->client; char buf[3]; int ret; dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd); buf[0] = FRAME_START; buf[1] = 1; /* data size, command only */ buf[2] = cmd; ret = i2c_master_send(client, &buf[0], ARRAY_SIZE(buf)); if (ret < 0) { dev_err(&client->dev, "i2c send data request error: %d\n", ret); return ret; } return 0; } static int zforce_send_wait(struct zforce_ts *ts, const char *buf, int len) { struct i2c_client *client = ts->client; int ret; dev_dbg(&client->dev, "sending %d bytes for command 0x%x\n", buf[1], buf[2]); ts->command_waiting = buf[2]; ret = i2c_master_send(client, buf, len); if (ret < 0) { dev_err(&client->dev, "i2c send data request error: %d\n", ret); return ret; } dev_dbg(&client->dev, "waiting for result for command 0x%x\n", buf[2]); if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0) return -ETIME; ret = ts->command_result; return 0; } static int zforce_command_wait(struct zforce_ts *ts, u8 cmd) { struct i2c_client *client = ts->client; char buf[3]; int error; dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd); buf[0] = FRAME_START; buf[1] = 1; /* data size, command only */ buf[2] = cmd; error = zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); if (error) { dev_err(&client->dev, "i2c send data request error: %d\n", error); return error; } return 0; } static int zforce_resolution(struct zforce_ts *ts, u16 x, u16 y) { struct i2c_client *client = ts->client; char buf[7] = { FRAME_START, 5, COMMAND_RESOLUTION, (x & 0xff), ((x >> 8) & 0xff), (y & 0xff), ((y >> 8) & 0xff) }; dev_dbg(&client->dev, "set resolution to (%d,%d)\n", x, y); return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); } static int zforce_scan_frequency(struct zforce_ts *ts, u16 idle, u16 finger, u16 stylus) { struct i2c_client *client = ts->client; char buf[9] = { FRAME_START, 7, COMMAND_SCANFREQ, (idle & 0xff), ((idle >> 8) & 0xff), (finger & 0xff), ((finger >> 8) & 0xff), (stylus & 0xff), ((stylus >> 8) & 0xff) }; dev_dbg(&client->dev, "set scan frequency to (idle: %d, finger: %d, stylus: %d)\n", idle, finger, stylus); return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); } static int zforce_setconfig(struct zforce_ts *ts, char b1) { struct i2c_client *client = ts->client; char buf[7] = { FRAME_START, 5, COMMAND_SETCONFIG, b1, 0, 0, 0 }; dev_dbg(&client->dev, "set config to (%d)\n", b1); return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); } static int zforce_start(struct zforce_ts *ts) { struct i2c_client *client = ts->client; int error; dev_dbg(&client->dev, "starting device\n"); error = zforce_command_wait(ts, COMMAND_INITIALIZE); if (error) { dev_err(&client->dev, "Unable to initialize, %d\n", error); return error; } error = zforce_resolution(ts, ts->prop.max_x, ts->prop.max_y); if (error) { dev_err(&client->dev, "Unable to set resolution, %d\n", error); goto err_deactivate; } error = zforce_scan_frequency(ts, 10, 50, 50); if (error) { dev_err(&client->dev, "Unable to set scan frequency, %d\n", error); goto err_deactivate; } error = zforce_setconfig(ts, SETCONFIG_DUALTOUCH); if (error) { dev_err(&client->dev, "Unable to set config\n"); goto err_deactivate; } /* start sending touch events */ error = zforce_command(ts, COMMAND_DATAREQUEST); if (error) { dev_err(&client->dev, "Unable to request data\n"); goto err_deactivate; } /* * Per NN, initial cal. take max. of 200msec. * Allow time to complete this calibration */ msleep(200); return 0; err_deactivate: zforce_command_wait(ts, COMMAND_DEACTIVATE); return error; } static int zforce_stop(struct zforce_ts *ts) { struct i2c_client *client = ts->client; int error; dev_dbg(&client->dev, "stopping device\n"); /* Deactivates touch sensing and puts the device into sleep. */ error = zforce_command_wait(ts, COMMAND_DEACTIVATE); if (error) { dev_err(&client->dev, "could not deactivate device, %d\n", error); return error; } return 0; } static int zforce_touch_event(struct zforce_ts *ts, u8 *payload) { struct i2c_client *client = ts->client; struct zforce_point point; int count, i, num = 0; u8 *p; count = payload[0]; if (count > ZFORCE_REPORT_POINTS) { dev_warn(&client->dev, "too many coordinates %d, expected max %d\n", count, ZFORCE_REPORT_POINTS); count = ZFORCE_REPORT_POINTS; } for (i = 0; i < count; i++) { p = &payload[i * 9 + 1]; point.coord_x = get_unaligned_le16(&p[0]); point.coord_y = get_unaligned_le16(&p[2]); if (point.coord_x > ts->prop.max_x || point.coord_y > ts->prop.max_y) { dev_warn(&client->dev, "coordinates (%d,%d) invalid\n", point.coord_x, point.coord_y); point.coord_x = point.coord_y = 0; } point.state = p[4] & 0x0f; point.id = (p[4] & 0xf0) >> 4; /* determine touch major, minor and orientation */ point.area_major = max(p[5], p[6]); point.area_minor = min(p[5], p[6]); point.orientation = p[5] > p[6]; point.pressure = p[7]; point.prblty = p[8]; dev_dbg(&client->dev, "point %d/%d: state %d, id %d, pressure %d, prblty %d, x %d, y %d, amajor %d, aminor %d, ori %d\n", i, count, point.state, point.id, point.pressure, point.prblty, point.coord_x, point.coord_y, point.area_major, point.area_minor, point.orientation); /* the zforce id starts with "1", so needs to be decreased */ input_mt_slot(ts->input, point.id - 1); if (input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, point.state != STATE_UP)) { touchscreen_report_pos(ts->input, &ts->prop, point.coord_x, point.coord_y, true); input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, point.area_major); input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, point.area_minor); input_report_abs(ts->input, ABS_MT_ORIENTATION, point.orientation); num++; } } input_mt_sync_frame(ts->input); input_mt_report_finger_count(ts->input, num); input_sync(ts->input); return 0; } static int zforce_read_packet(struct zforce_ts *ts, u8 *buf) { struct i2c_client *client = ts->client; int ret; /* read 2 byte message header */ ret = i2c_master_recv(client, buf, 2); if (ret < 0) { dev_err(&client->dev, "error reading header: %d\n", ret); return ret; } if (buf[PAYLOAD_HEADER] != FRAME_START) { dev_err(&client->dev, "invalid frame start: %d\n", buf[0]); return -EIO; } if (buf[PAYLOAD_LENGTH] == 0) { dev_err(&client->dev, "invalid payload length: %d\n", buf[PAYLOAD_LENGTH]); return -EIO; } /* read the message */ ret = i2c_master_recv(client, &buf[PAYLOAD_BODY], buf[PAYLOAD_LENGTH]); if (ret < 0) { dev_err(&client->dev, "error reading payload: %d\n", ret); return ret; } dev_dbg(&client->dev, "read %d bytes for response command 0x%x\n", buf[PAYLOAD_LENGTH], buf[PAYLOAD_BODY]); return 0; } static void zforce_complete(struct zforce_ts *ts, int cmd, int result) { struct i2c_client *client = ts->client; if (ts->command_waiting == cmd) { dev_dbg(&client->dev, "completing command 0x%x\n", cmd); ts->command_result = result; complete(&ts->command_done); } else { dev_dbg(&client->dev, "command %d not for us\n", cmd); } } static irqreturn_t zforce_irq(int irq, void *dev_id) { struct zforce_ts *ts = dev_id; struct i2c_client *client = ts->client; if (ts->suspended && device_may_wakeup(&client->dev)) pm_wakeup_event(&client->dev, 500); return IRQ_WAKE_THREAD; } static irqreturn_t zforce_irq_thread(int irq, void *dev_id) { struct zforce_ts *ts = dev_id; struct i2c_client *client = ts->client; int error; u8 payload_buffer[FRAME_MAXSIZE]; u8 *payload; bool suspending; /* * When still suspended, return. * Due to the level-interrupt we will get re-triggered later. */ if (ts->suspended) { msleep(20); return IRQ_HANDLED; } dev_dbg(&client->dev, "handling interrupt\n"); /* Don't emit wakeup events from commands run by zforce_suspend */ suspending = READ_ONCE(ts->suspending); if (!suspending && device_may_wakeup(&client->dev)) pm_stay_awake(&client->dev); /* * Run at least once and exit the loop if * - the optional interrupt GPIO isn't specified * (there is only one packet read per ISR invocation, then) * or * - the GPIO isn't active any more * (packet read until the level GPIO indicates that there is * no IRQ any more) */ do { error = zforce_read_packet(ts, payload_buffer); if (error) { dev_err(&client->dev, "could not read packet, ret: %d\n", error); break; } payload = &payload_buffer[PAYLOAD_BODY]; switch (payload[RESPONSE_ID]) { case NOTIFICATION_TOUCH: /* * Always report touch-events received while * suspending, when being a wakeup source */ if (suspending && device_may_wakeup(&client->dev)) pm_wakeup_event(&client->dev, 500); zforce_touch_event(ts, &payload[RESPONSE_DATA]); break; case NOTIFICATION_BOOTCOMPLETE: ts->boot_complete = payload[RESPONSE_DATA]; zforce_complete(ts, payload[RESPONSE_ID], 0); break; case RESPONSE_INITIALIZE: case RESPONSE_DEACTIVATE: