| // 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/module.h> |
| #include <linux/hrtimer.h> |
| #include <linux/slab.h> |
| #include <linux/input.h> |
| #include <linux/interrupt.h> |
| #include <linux/i2c.h> |
| #include <linux/delay.h> |
| #include <linux/gpio/consumer.h> |
| #include <linux/device.h> |
| #include <linux/sysfs.h> |
| #include <linux/input/mt.h> |
| #include <linux/platform_data/zforce_ts.h> |
| #include <linux/regulator/consumer.h> |
| #include <linux/of.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 |
| * @access_mutex serialize i2c-access, to keep multipart reads together |
| * @command_done completion to wait for the command result |
| * @command_mutex serialize commands sent to the ic |
| * @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; |
| const struct zforce_ts_platdata *pdata; |
| char phys[32]; |
| |
| struct regulator *reg_vdd; |
| |
| 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 mutex access_mutex; |
| |
| struct completion command_done; |
| struct mutex command_mutex; |
| 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; |
| |
| mutex_lock(&ts->access_mutex); |
| ret = i2c_master_send(client, &buf[0], ARRAY_SIZE(buf)); |
| mutex_unlock(&ts->access_mutex); |
| if (ret < 0) { |
| dev_err(&client->dev, "i2c send data request error: %d\n", ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static void zforce_reset_assert(struct zforce_ts *ts) |
| { |
| gpiod_set_value_cansleep(ts->gpio_rst, 1); |
| } |
| |
| static void zforce_reset_deassert(struct zforce_ts *ts) |
| { |
| gpiod_set_value_cansleep(ts->gpio_rst, 0); |
| } |
| |
| static int zforce_send_wait(struct zforce_ts *ts, const char *buf, int len) |
| { |
| struct i2c_client *client = ts->client; |
| int ret; |
| |
| ret = mutex_trylock(&ts->command_mutex); |
| if (!ret) { |
| dev_err(&client->dev, "already waiting for a command\n"); |
| return -EBUSY; |
| } |
| |
| dev_dbg(&client->dev, "sending %d bytes for command 0x%x\n", |
| buf[1], buf[2]); |
| |
| ts->command_waiting = buf[2]; |
| |
| mutex_lock(&ts->access_mutex); |
| ret = i2c_master_send(client, buf, len); |
| mutex_unlock(&ts->access_mutex); |
| if (ret < 0) { |
| dev_err(&client->dev, "i2c send data request error: %d\n", ret); |
| goto unlock; |
| } |
| |
| 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) { |
| ret = -ETIME; |
| goto unlock; |
| } |
| |
| ret = ts->command_result; |
| |
| unlock: |
| mutex_unlock(&ts->command_mutex); |
| return ret; |
| } |
| |
| static int zforce_command_wait(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 = zforce_send_wait(ts, &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_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; |
| const struct zforce_ts_platdata *pdata = ts->pdata; |
| int ret; |
| |
| dev_dbg(&client->dev, "starting device\n"); |
| |
| ret = zforce_command_wait(ts, COMMAND_INITIALIZE); |
| if (ret) { |
| dev_err(&client->dev, "Unable to initialize, %d\n", ret); |
| return ret; |
| } |
| |
| ret = zforce_resolution(ts, pdata->x_max, pdata->y_max); |
| if (ret) { |
| dev_err(&client->dev, "Unable to set resolution, %d\n", ret); |
| goto error; |
| } |
| |
| ret = zforce_scan_frequency(ts, 10, 50, 50); |
| if (ret) { |
| dev_err(&client->dev, "Unable to set scan frequency, %d\n", |
| ret); |
| goto error; |
| } |
| |
| ret = zforce_setconfig(ts, SETCONFIG_DUALTOUCH); |
| if (ret) { |
| dev_err(&client->dev, "Unable to set config\n"); |
| goto error; |
| } |
| |
| /* start sending touch events */ |
| ret = zforce_command(ts, COMMAND_DATAREQUEST); |
| if (ret) { |
| dev_err(&client->dev, "Unable to request data\n"); |
| goto error; |
| } |
| |
| /* |
| * Per NN, initial cal. take max. of 200msec. |
| * Allow time to complete this calibration |
| */ |
| msleep(200); |
| |
| return 0; |
| |
| error: |
| zforce_command_wait(ts, COMMAND_DEACTIVATE); |
| return ret; |
| } |
| |
| static int zforce_stop(struct zforce_ts *ts) |
| { |
| struct i2c_client *client = ts->client; |
| int ret; |
| |
| dev_dbg(&client->dev, "stopping device\n"); |
| |
| /* Deactivates touch sensing and puts the device into sleep. */ |
| ret = zforce_command_wait(ts, COMMAND_DEACTIVATE); |
| if (ret != 0) { |
| dev_err(&client->dev, "could not deactivate device, %d\n", |
| ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int zforce_touch_event(struct zforce_ts *ts, u8 *payload) |
| { |
| struct i2c_client *client = ts->client; |
| const struct zforce_ts_platdata *pdata = ts->pdata; |
| struct zforce_point point; |
| int count, i, num = 0; |
| |
| 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++) { |
| point.coord_x = |
| payload[9 * i + 2] << 8 | payload[9 * i + 1]; |
| point.coord_y = |
| payload[9 * i + 4] << 8 | payload[9 * i + 3]; |
| |
| if (point.coord_x > pdata->x_max || |
| point.coord_y > pdata->y_max) { |
| dev_warn(&client->dev, "coordinates (%d,%d) invalid\n", |
| point.coord_x, point.coord_y); |
| point.coord_x = point.coord_y = 0; |
| } |
| |
| point.state = payload[9 * i + 5] & 0x0f; |
| point.id = (payload[9 * i + 5] & 0xf0) >> 4; |
| |
| /* determine touch major, minor and orientation */ |
| point.area_major = max(payload[9 * i + 6], |
| payload[9 * i + 7]); |
| point.area_minor = min(payload[9 * i + 6], |
| payload[9 * i + 7]); |
| point.orientation = payload[9 * i + 6] > payload[9 * i + 7]; |
| |
| point.pressure = payload[9 * i + 8]; |
| point.prblty = payload[9 * i + 9]; |
| |
| 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); |
| |
| input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, |
| point.state != STATE_UP); |
| |
| if (point.state != STATE_UP) { |
| input_report_abs(ts->input, ABS_MT_POSITION_X, |
| point.coord_x); |
| input_report_abs(ts->input, ABS_MT_POSITION_Y, |
| point.coord_y); |
| 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; |
| |
| mutex_lock(&ts->access_mutex); |
| |
| /* 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); |
| goto unlock; |
| } |
| |
| if (buf[PAYLOAD_HEADER] != FRAME_START) { |
| dev_err(&client->dev, "invalid frame start: %d\n", buf[0]); |
| ret = -EIO; |
| goto unlock; |
| } |
| |
| if (buf[PAYLOAD_LENGTH] == 0) { |
| dev_err(&client->dev, "invalid payload length: %d\n", |
| buf[PAYLOAD_LENGTH]); |
| ret = -EIO; |
| goto unlock; |
| } |
| |
| /* 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); |
| goto unlock; |
| } |
| |
| dev_dbg(&client->dev, "read %d bytes for response command 0x%x\n", |
| buf[PAYLOAD_LENGTH], buf[PAYLOAD_BODY]); |
| |
| unlock: |
| mutex_unlock(&ts->access_mutex); |
| return ret; |
| } |
| |
| 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 ret; |
| u8 payload_buffer[FRAME_MAXSIZE]; |
| u8 *payload; |
| |
| /* |
| * 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 */ |
| if (!ts->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 { |
| ret = zforce_read_packet(ts, payload_buffer); |
| if (ret < 0) { |
| dev_err(&client->dev, |
| "could not read packet, ret: %d\n", ret); |
| 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 (ts->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: |
| case RESPONSE_SETCONFIG: |
| case RESPONSE_RESOLUTION: |
| case RESPONSE_SCANFREQ: |
| zforce_complete(ts, payload[RESPONSE_ID], |
| payload[RESPONSE_DATA]); |
| break; |
| |
| case RESPONSE_STATUS: |
| /* |
| * Version Payload Results |
| * [2:major] [2:minor] [2:build] [2:rev] |
| */ |
| ts->version_major = (payload[RESPONSE_DATA + 1] << 8) | |
| payload[RESPONSE_DATA]; |
| ts->version_minor = (payload[RESPONSE_DATA + 3] << 8) | |
| payload[RESPONSE_DATA + 2]; |
| ts->version_build = (payload[RESPONSE_DATA + 5] << 8) | |
| payload[RESPONSE_DATA + 4]; |
| ts->version_rev = (payload[RESPONSE_DATA + 7] << 8) | |
| payload[RESPONSE_DATA + 6]; |
| dev_dbg(&ts->client->dev, |
| "Firmware Version %04x:%04x %04x:%04x\n", |
| ts->version_major, ts->version_minor, |
| ts->version_build, ts->version_rev); |
| |
| zforce_complete(ts, payload[RESPONSE_ID], 0); |
| break; |
| |
| case NOTIFICATION_INVALID_COMMAND: |
| dev_err(&ts->client->dev, "invalid command: 0x%x\n", |
| payload[RESPONSE_DATA]); |
| break; |
| |
| default: |
| dev_err(&ts->client->dev, |
| "unrecognized response id: 0x%x\n", |
| payload[RESPONSE_ID]); |
| break; |
| } |
| } while (gpiod_get_value_cansleep(ts->gpio_int)); |
| |
| if (!ts->suspending && device_may_wakeup(&client->dev)) |
| pm_relax(&client->dev); |
| |
| dev_dbg(&client->dev, "finished interrupt\n"); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static int zforce_input_open(struct input_dev *dev) |
| { |
| struct zforce_ts *ts = input_get_drvdata(dev); |
| |
| return zforce_start(ts); |
| } |
| |
| static void zforce_input_close(struct input_dev *dev) |
| { |
| struct zforce_ts *ts = input_get_drvdata(dev); |
| struct i2c_client *client = ts->client; |
| int ret; |
| |
| ret = zforce_stop(ts); |
| if (ret) |
| dev_warn(&client->dev, "stopping zforce failed\n"); |
| |
| return; |
| } |
| |
| static int zforce_suspend(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct zforce_ts *ts = i2c_get_clientdata(client); |
| struct input_dev *input = ts->input; |
| int ret = 0; |
| |
| mutex_lock(&input->mutex); |
| ts->suspending = true; |
| |
| /* |
| * When configured as a wakeup source device should always wake |
| * the system, therefore start device if necessary. |
| */ |
| if (device_may_wakeup(&client->dev)) { |
| dev_dbg(&client->dev, "suspend while being a wakeup source\n"); |
| |
| /* Need to start device, if not open, to be a wakeup source. */ |
| if (!input_device_enabled(input)) { |
| ret = zforce_start(ts); |
| if (ret) |
| goto unlock; |
| } |
| |
| enable_irq_wake(client->irq); |
| } else if (input_device_enabled(input)) { |
| dev_dbg(&client->dev, |
| "suspend without being a wakeup source\n"); |
| |
| ret = zforce_stop(ts); |
| if (ret) |
| goto unlock; |
| |
| disable_irq(client->irq); |
| } |
| |
| ts->suspended = true; |
| |
| unlock: |
| ts->suspending = false; |
| mutex_unlock(&input->mutex); |
| |
| return ret; |
| } |
| |
| static int zforce_resume(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct zforce_ts *ts = i2c_get_clientdata(client); |
| struct input_dev *input = ts->input; |
| int ret = 0; |
| |
| mutex_lock(&input->mutex); |
| |
| ts->suspended = false; |
| |
| if (device_may_wakeup(&client->dev)) { |
| dev_dbg(&client->dev, "resume from being a wakeup source\n"); |
| |
| disable_irq_wake(client->irq); |
| |
| /* need to stop device if it was not open on suspend */ |
| if (!input_device_enabled(input)) { |
| ret = zforce_stop(ts); |
| if (ret) |
| goto unlock; |
| } |
| } else if (input_device_enabled(input)) { |
| dev_dbg(&client->dev, "resume without being a wakeup source\n"); |
| |
| enable_irq(client->irq); |
| |
| ret = zforce_start(ts); |
| if (ret < 0) |
| goto unlock; |
| } |
| |
| unlock: |
| mutex_unlock(&input->mutex); |
| |
| return ret; |
| } |
| |
| static DEFINE_SIMPLE_DEV_PM_OPS(zforce_pm_ops, zforce_suspend, zforce_resume); |
| |
| static void zforce_reset(void *data) |
| { |
| struct zforce_ts *ts = data; |
| |
| zforce_reset_assert(ts); |
| |
| udelay(10); |
| |
| if (!IS_ERR(ts->reg_vdd)) |
| regulator_disable(ts->reg_vdd); |
| } |
| |
| static struct zforce_ts_platdata *zforce_parse_dt(struct device *dev) |
| { |
| struct zforce_ts_platdata *pdata; |
| struct device_node *np = dev->of_node; |
| |
| if (!np) |
| return ERR_PTR(-ENOENT); |
| |
| pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); |
| if (!pdata) { |
| dev_err(dev, "failed to allocate platform data\n"); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| if (of_property_read_u32(np, "x-size", &pdata->x_max)) { |
| dev_err(dev, "failed to get x-size property\n"); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| if (of_property_read_u32(np, "y-size", &pdata->y_max)) { |
| dev_err(dev, "failed to get y-size property\n"); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| return pdata; |
| } |
| |
| static int zforce_probe(struct i2c_client *client) |
| { |
| const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev); |
| struct zforce_ts *ts; |
| struct input_dev *input_dev; |
| int ret; |
| |
| if (!pdata) { |
| pdata = zforce_parse_dt(&client->dev); |
| if (IS_ERR(pdata)) |
| return PTR_ERR(pdata); |
| } |
| |
| ts = devm_kzalloc(&client->dev, sizeof(struct zforce_ts), GFP_KERNEL); |
| if (!ts) |
| return -ENOMEM; |
| |
| ts->gpio_rst = devm_gpiod_get_optional(&client->dev, "reset", |
| GPIOD_OUT_HIGH); |
| if (IS_ERR(ts->gpio_rst)) { |
| ret = PTR_ERR(ts->gpio_rst); |
| dev_err(&client->dev, |
| "failed to request reset GPIO: %d\n", ret); |
| return ret; |
| } |
| |
| if (ts->gpio_rst) { |
| ts->gpio_int = devm_gpiod_get_optional(&client->dev, "irq", |
| GPIOD_IN); |
| if (IS_ERR(ts->gpio_int)) { |
| ret = PTR_ERR(ts->gpio_int); |
| dev_err(&client->dev, |
| "failed to request interrupt GPIO: %d\n", ret); |
| return ret; |
| } |
| } else { |
| /* |
| * Deprecated GPIO handling for compatibility |
| * with legacy binding. |
| */ |
| |
| /* INT GPIO */ |
| ts->gpio_int = devm_gpiod_get_index(&client->dev, NULL, 0, |
| GPIOD_IN); |
| if (IS_ERR(ts->gpio_int)) { |
| ret = PTR_ERR(ts->gpio_int); |
| dev_err(&client->dev, |
| "failed to request interrupt GPIO: %d\n", ret); |
| return ret; |
| } |
| |
| /* RST GPIO */ |
| ts->gpio_rst = devm_gpiod_get_index(&client->dev, NULL, 1, |
| GPIOD_OUT_HIGH); |
| if (IS_ERR(ts->gpio_rst)) { |
| ret = PTR_ERR(ts->gpio_rst); |
| dev_err(&client->dev, |
| "failed to request reset GPIO: %d\n", ret); |
| return ret; |
| } |
| } |
| |
| ts->reg_vdd = devm_regulator_get_optional(&client->dev, "vdd"); |
| if (IS_ERR(ts->reg_vdd)) { |
| ret = PTR_ERR(ts->reg_vdd); |
| if (ret == -EPROBE_DEFER) |
| return ret; |
| } else { |
| ret = regulator_enable(ts->reg_vdd); |
| if (ret) |
| return ret; |
| |
| /* |
| * according to datasheet add 100us grace time after regular |
| * regulator enable delay. |
| */ |
| udelay(100); |
| } |
| |
| ret = devm_add_action(&client->dev, zforce_reset, ts); |
| if (ret) { |
| dev_err(&client->dev, "failed to register reset action, %d\n", |
| ret); |
| |
| /* hereafter the regulator will be disabled by the action */ |
| if (!IS_ERR(ts->reg_vdd)) |
| regulator_disable(ts->reg_vdd); |
| |
| return ret; |
| } |
| |
| snprintf(ts->phys, sizeof(ts->phys), |
| "%s/input0", dev_name(&client->dev)); |
| |
| input_dev = devm_input_allocate_device(&client->dev); |
| if (!input_dev) { |
| dev_err(&client->dev, "could not allocate input device\n"); |
| return -ENOMEM; |
| } |
| |
| mutex_init(&ts->access_mutex); |
| mutex_init(&ts->command_mutex); |
| |
| ts->pdata = pdata; |
| ts->client = client; |
| ts->input = input_dev; |
| |
| input_dev->name = "Neonode zForce touchscreen"; |
| input_dev->phys = ts->phys; |
| input_dev->id.bustype = BUS_I2C; |
| |
| input_dev->open = zforce_input_open; |
| input_dev->close = zforce_input_close; |
| |
| __set_bit(EV_KEY, input_dev->evbit); |
| __set_bit(EV_SYN, input_dev->evbit); |
| __set_bit(EV_ABS, input_dev->evbit); |
| |
| /* For multi touch */ |
| input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0, |
| pdata->x_max, 0, 0); |
| input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0, |
| pdata->y_max, 0, 0); |
| |
| input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, |
| ZFORCE_MAX_AREA, 0, 0); |
| input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0, |
| ZFORCE_MAX_AREA, 0, 0); |
| input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0); |
| input_mt_init_slots(input_dev, ZFORCE_REPORT_POINTS, INPUT_MT_DIRECT); |
| |
| input_set_drvdata(ts->input, ts); |
| |
| init_completion(&ts->command_done); |
| |
| /* |
| * The zforce pulls the interrupt low when it has data ready. |
| * After it is triggered the isr thread runs until all the available |
| * packets have been read and the interrupt is high again. |
| * Therefore we can trigger the interrupt anytime it is low and do |
| * not need to limit it to the interrupt edge. |
| */ |
| ret = devm_request_threaded_irq(&client->dev, client->irq, |
| zforce_irq, zforce_irq_thread, |
| IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
| input_dev->name, ts); |
| if (ret) { |
| dev_err(&client->dev, "irq %d request failed\n", client->irq); |
| return ret; |
| } |
| |
| i2c_set_clientdata(client, ts); |
| |
| /* let the controller boot */ |
| zforce_reset_deassert(ts); |
| |
| ts->command_waiting = NOTIFICATION_BOOTCOMPLETE; |
| if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0) |
| dev_warn(&client->dev, "bootcomplete timed out\n"); |
| |
| /* need to start device to get version information */ |
| ret = zforce_command_wait(ts, COMMAND_INITIALIZE); |
| if (ret) { |
| dev_err(&client->dev, "unable to initialize, %d\n", ret); |
| return ret; |
| } |
| |
| /* this gets the firmware version among other information */ |
| ret = zforce_command_wait(ts, COMMAND_STATUS); |
| if (ret < 0) { |
| dev_err(&client->dev, "couldn't get status, %d\n", ret); |
| zforce_stop(ts); |
| return ret; |
| } |
| |
| /* stop device and put it into sleep until it is opened */ |
| ret = zforce_stop(ts); |
| if (ret < 0) |
| return ret; |
| |
| device_set_wakeup_capable(&client->dev, true); |
| |
| ret = input_register_device(input_dev); |
| if (ret) { |
| dev_err(&client->dev, "could not register input device, %d\n", |
| ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static struct i2c_device_id zforce_idtable[] = { |
| { "zforce-ts", 0 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, zforce_idtable); |
| |
| #ifdef CONFIG_OF |
| static const struct of_device_id zforce_dt_idtable[] = { |
| { .compatible = "neonode,zforce" }, |
| {}, |
| }; |
| MODULE_DEVICE_TABLE(of, zforce_dt_idtable); |
| #endif |
| |
| static struct i2c_driver zforce_driver = { |
| .driver = { |
| .name = "zforce-ts", |
| .pm = pm_sleep_ptr(&zforce_pm_ops), |
| .of_match_table = of_match_ptr(zforce_dt_idtable), |
| }, |
| .probe_new = zforce_probe, |
| .id_table = zforce_idtable, |
| }; |
| |
| module_i2c_driver(zforce_driver); |
| |
| MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); |
| MODULE_DESCRIPTION("zForce TouchScreen Driver"); |
| MODULE_LICENSE("GPL"); |