1c6d81bd7SHeiko Stübner /* 2c6d81bd7SHeiko Stübner * Copyright (C) 2012-2013 MundoReader S.L. 3c6d81bd7SHeiko Stübner * Author: Heiko Stuebner <heiko@sntech.de> 4c6d81bd7SHeiko Stübner * 5c6d81bd7SHeiko Stübner * based in parts on Nook zforce driver 6c6d81bd7SHeiko Stübner * 7c6d81bd7SHeiko Stübner * Copyright (C) 2010 Barnes & Noble, Inc. 8c6d81bd7SHeiko Stübner * Author: Pieter Truter<ptruter@intrinsyc.com> 9c6d81bd7SHeiko Stübner * 10c6d81bd7SHeiko Stübner * This software is licensed under the terms of the GNU General Public 11c6d81bd7SHeiko Stübner * License version 2, as published by the Free Software Foundation, and 12c6d81bd7SHeiko Stübner * may be copied, distributed, and modified under those terms. 13c6d81bd7SHeiko Stübner * 14c6d81bd7SHeiko Stübner * This program is distributed in the hope that it will be useful, 15c6d81bd7SHeiko Stübner * but WITHOUT ANY WARRANTY; without even the implied warranty of 16c6d81bd7SHeiko Stübner * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17c6d81bd7SHeiko Stübner * GNU General Public License for more details. 18c6d81bd7SHeiko Stübner */ 19c6d81bd7SHeiko Stübner 20c6d81bd7SHeiko Stübner #include <linux/module.h> 21c6d81bd7SHeiko Stübner #include <linux/hrtimer.h> 22c6d81bd7SHeiko Stübner #include <linux/slab.h> 23c6d81bd7SHeiko Stübner #include <linux/input.h> 24c6d81bd7SHeiko Stübner #include <linux/interrupt.h> 25c6d81bd7SHeiko Stübner #include <linux/i2c.h> 26c6d81bd7SHeiko Stübner #include <linux/delay.h> 272d538095SDirk Behme #include <linux/gpio/consumer.h> 28c6d81bd7SHeiko Stübner #include <linux/device.h> 29c6d81bd7SHeiko Stübner #include <linux/sysfs.h> 30c6d81bd7SHeiko Stübner #include <linux/input/mt.h> 31c6d81bd7SHeiko Stübner #include <linux/platform_data/zforce_ts.h> 3239740370SHeiko Stuebner #include <linux/regulator/consumer.h> 336f2e6c9bSHeiko Stübner #include <linux/of.h> 34c6d81bd7SHeiko Stübner 35c6d81bd7SHeiko Stübner #define WAIT_TIMEOUT msecs_to_jiffies(1000) 36c6d81bd7SHeiko Stübner 37c6d81bd7SHeiko Stübner #define FRAME_START 0xee 38d333b606SLuis Ortega #define FRAME_MAXSIZE 257 39c6d81bd7SHeiko Stübner 40c6d81bd7SHeiko Stübner /* Offsets of the different parts of the payload the controller sends */ 41c6d81bd7SHeiko Stübner #define PAYLOAD_HEADER 0 42c6d81bd7SHeiko Stübner #define PAYLOAD_LENGTH 1 43c6d81bd7SHeiko Stübner #define PAYLOAD_BODY 2 44c6d81bd7SHeiko Stübner 45c6d81bd7SHeiko Stübner /* Response offsets */ 46c6d81bd7SHeiko Stübner #define RESPONSE_ID 0 47c6d81bd7SHeiko Stübner #define RESPONSE_DATA 1 48c6d81bd7SHeiko Stübner 49c6d81bd7SHeiko Stübner /* Commands */ 50c6d81bd7SHeiko Stübner #define COMMAND_DEACTIVATE 0x00 51c6d81bd7SHeiko Stübner #define COMMAND_INITIALIZE 0x01 52c6d81bd7SHeiko Stübner #define COMMAND_RESOLUTION 0x02 53c6d81bd7SHeiko Stübner #define COMMAND_SETCONFIG 0x03 54c6d81bd7SHeiko Stübner #define COMMAND_DATAREQUEST 0x04 55c6d81bd7SHeiko Stübner #define COMMAND_SCANFREQ 0x08 56c6d81bd7SHeiko Stübner #define COMMAND_STATUS 0X1e 57c6d81bd7SHeiko Stübner 58c6d81bd7SHeiko Stübner /* 59c6d81bd7SHeiko Stübner * Responses the controller sends as a result of 60c6d81bd7SHeiko Stübner * command requests 61c6d81bd7SHeiko Stübner */ 62c6d81bd7SHeiko Stübner #define RESPONSE_DEACTIVATE 0x00 63c6d81bd7SHeiko Stübner #define RESPONSE_INITIALIZE 0x01 64c6d81bd7SHeiko Stübner #define RESPONSE_RESOLUTION 0x02 65c6d81bd7SHeiko Stübner #define RESPONSE_SETCONFIG 0x03 66c6d81bd7SHeiko Stübner #define RESPONSE_SCANFREQ 0x08 67c6d81bd7SHeiko Stübner #define RESPONSE_STATUS 0X1e 68c6d81bd7SHeiko Stübner 69c6d81bd7SHeiko Stübner /* 70deb49819SLuis Ortega * Notifications are sent by the touch controller without 71c6d81bd7SHeiko Stübner * being requested by the driver and include for example 72c6d81bd7SHeiko Stübner * touch indications 73c6d81bd7SHeiko Stübner */ 74c6d81bd7SHeiko Stübner #define NOTIFICATION_TOUCH 0x04 75c6d81bd7SHeiko Stübner #define NOTIFICATION_BOOTCOMPLETE 0x07 76c6d81bd7SHeiko Stübner #define NOTIFICATION_OVERRUN 0x25 77c6d81bd7SHeiko Stübner #define NOTIFICATION_PROXIMITY 0x26 78c6d81bd7SHeiko Stübner #define NOTIFICATION_INVALID_COMMAND 0xfe 79c6d81bd7SHeiko Stübner 80c6d81bd7SHeiko Stübner #define ZFORCE_REPORT_POINTS 2 81c6d81bd7SHeiko Stübner #define ZFORCE_MAX_AREA 0xff 82c6d81bd7SHeiko Stübner 83c6d81bd7SHeiko Stübner #define STATE_DOWN 0 84c6d81bd7SHeiko Stübner #define STATE_MOVE 1 85c6d81bd7SHeiko Stübner #define STATE_UP 2 86c6d81bd7SHeiko Stübner 87c6d81bd7SHeiko Stübner #define SETCONFIG_DUALTOUCH (1 << 0) 88c6d81bd7SHeiko Stübner 89c6d81bd7SHeiko Stübner struct zforce_point { 90c6d81bd7SHeiko Stübner int coord_x; 91c6d81bd7SHeiko Stübner int coord_y; 92c6d81bd7SHeiko Stübner int state; 93c6d81bd7SHeiko Stübner int id; 94c6d81bd7SHeiko Stübner int area_major; 95c6d81bd7SHeiko Stübner int area_minor; 96c6d81bd7SHeiko Stübner int orientation; 97c6d81bd7SHeiko Stübner int pressure; 98c6d81bd7SHeiko Stübner int prblty; 99c6d81bd7SHeiko Stübner }; 100c6d81bd7SHeiko Stübner 101c6d81bd7SHeiko Stübner /* 102c6d81bd7SHeiko Stübner * @client the i2c_client 103c6d81bd7SHeiko Stübner * @input the input device 104c6d81bd7SHeiko Stübner * @suspending in the process of going to suspend (don't emit wakeup 105c6d81bd7SHeiko Stübner * events for commands executed to suspend the device) 106c6d81bd7SHeiko Stübner * @suspended device suspended 107c6d81bd7SHeiko Stübner * @access_mutex serialize i2c-access, to keep multipart reads together 108c6d81bd7SHeiko Stübner * @command_done completion to wait for the command result 109deb49819SLuis Ortega * @command_mutex serialize commands sent to the ic 110deb49819SLuis Ortega * @command_waiting the id of the command that is currently waiting 111c6d81bd7SHeiko Stübner * for a result 112c6d81bd7SHeiko Stübner * @command_result returned result of the command 113c6d81bd7SHeiko Stübner */ 114c6d81bd7SHeiko Stübner struct zforce_ts { 115c6d81bd7SHeiko Stübner struct i2c_client *client; 116c6d81bd7SHeiko Stübner struct input_dev *input; 117c6d81bd7SHeiko Stübner const struct zforce_ts_platdata *pdata; 118c6d81bd7SHeiko Stübner char phys[32]; 119c6d81bd7SHeiko Stübner 12039740370SHeiko Stuebner struct regulator *reg_vdd; 12139740370SHeiko Stuebner 1222d538095SDirk Behme struct gpio_desc *gpio_int; 1232d538095SDirk Behme struct gpio_desc *gpio_rst; 1242d538095SDirk Behme 125c6d81bd7SHeiko Stübner bool suspending; 126c6d81bd7SHeiko Stübner bool suspended; 127c6d81bd7SHeiko Stübner bool boot_complete; 128c6d81bd7SHeiko Stübner 129c6d81bd7SHeiko Stübner /* Firmware version information */ 130c6d81bd7SHeiko Stübner u16 version_major; 131c6d81bd7SHeiko Stübner u16 version_minor; 132c6d81bd7SHeiko Stübner u16 version_build; 133c6d81bd7SHeiko Stübner u16 version_rev; 134c6d81bd7SHeiko Stübner 135c6d81bd7SHeiko Stübner struct mutex access_mutex; 136c6d81bd7SHeiko Stübner 137c6d81bd7SHeiko Stübner struct completion command_done; 138c6d81bd7SHeiko Stübner struct mutex command_mutex; 139c6d81bd7SHeiko Stübner int command_waiting; 140c6d81bd7SHeiko Stübner int command_result; 141c6d81bd7SHeiko Stübner }; 142c6d81bd7SHeiko Stübner 143c6d81bd7SHeiko Stübner static int zforce_command(struct zforce_ts *ts, u8 cmd) 144c6d81bd7SHeiko Stübner { 145c6d81bd7SHeiko Stübner struct i2c_client *client = ts->client; 146c6d81bd7SHeiko Stübner char buf[3]; 147c6d81bd7SHeiko Stübner int ret; 148c6d81bd7SHeiko Stübner 149c6d81bd7SHeiko Stübner dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd); 150c6d81bd7SHeiko Stübner 151c6d81bd7SHeiko Stübner buf[0] = FRAME_START; 152c6d81bd7SHeiko Stübner buf[1] = 1; /* data size, command only */ 153c6d81bd7SHeiko Stübner buf[2] = cmd; 154c6d81bd7SHeiko Stübner 155c6d81bd7SHeiko Stübner mutex_lock(&ts->access_mutex); 156c6d81bd7SHeiko Stübner ret = i2c_master_send(client, &buf[0], ARRAY_SIZE(buf)); 157c6d81bd7SHeiko Stübner mutex_unlock(&ts->access_mutex); 158c6d81bd7SHeiko Stübner if (ret < 0) { 159c6d81bd7SHeiko Stübner dev_err(&client->dev, "i2c send data request error: %d\n", ret); 160c6d81bd7SHeiko Stübner return ret; 161c6d81bd7SHeiko Stübner } 162c6d81bd7SHeiko Stübner 163c6d81bd7SHeiko Stübner return 0; 164c6d81bd7SHeiko Stübner } 165c6d81bd7SHeiko Stübner 1662d538095SDirk Behme static void zforce_reset_assert(struct zforce_ts *ts) 1672d538095SDirk Behme { 1682d538095SDirk Behme gpiod_set_value_cansleep(ts->gpio_rst, 1); 1692d538095SDirk Behme } 1702d538095SDirk Behme 1712d538095SDirk Behme static void zforce_reset_deassert(struct zforce_ts *ts) 1722d538095SDirk Behme { 1732d538095SDirk Behme gpiod_set_value_cansleep(ts->gpio_rst, 0); 1742d538095SDirk Behme } 1752d538095SDirk Behme 176c6d81bd7SHeiko Stübner static int zforce_send_wait(struct zforce_ts *ts, const char *buf, int len) 177c6d81bd7SHeiko Stübner { 178c6d81bd7SHeiko Stübner struct i2c_client *client = ts->client; 179c6d81bd7SHeiko Stübner int ret; 180c6d81bd7SHeiko Stübner 181c6d81bd7SHeiko Stübner ret = mutex_trylock(&ts->command_mutex); 182c6d81bd7SHeiko Stübner if (!ret) { 183c6d81bd7SHeiko Stübner dev_err(&client->dev, "already waiting for a command\n"); 184c6d81bd7SHeiko Stübner return -EBUSY; 185c6d81bd7SHeiko Stübner } 186c6d81bd7SHeiko Stübner 187c6d81bd7SHeiko Stübner dev_dbg(&client->dev, "sending %d bytes for command 0x%x\n", 188c6d81bd7SHeiko Stübner buf[1], buf[2]); 189c6d81bd7SHeiko Stübner 190c6d81bd7SHeiko Stübner ts->command_waiting = buf[2]; 191c6d81bd7SHeiko Stübner 192c6d81bd7SHeiko Stübner mutex_lock(&ts->access_mutex); 193c6d81bd7SHeiko Stübner ret = i2c_master_send(client, buf, len); 194c6d81bd7SHeiko Stübner mutex_unlock(&ts->access_mutex); 195c6d81bd7SHeiko Stübner if (ret < 0) { 196c6d81bd7SHeiko Stübner dev_err(&client->dev, "i2c send data request error: %d\n", ret); 197c6d81bd7SHeiko Stübner goto unlock; 198c6d81bd7SHeiko Stübner } 199c6d81bd7SHeiko Stübner 200c6d81bd7SHeiko Stübner dev_dbg(&client->dev, "waiting for result for command 0x%x\n", buf[2]); 201c6d81bd7SHeiko Stübner 202c6d81bd7SHeiko Stübner if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0) { 203c6d81bd7SHeiko Stübner ret = -ETIME; 204c6d81bd7SHeiko Stübner goto unlock; 205c6d81bd7SHeiko Stübner } 206c6d81bd7SHeiko Stübner 207c6d81bd7SHeiko Stübner ret = ts->command_result; 208c6d81bd7SHeiko Stübner 209c6d81bd7SHeiko Stübner unlock: 210c6d81bd7SHeiko Stübner mutex_unlock(&ts->command_mutex); 211c6d81bd7SHeiko Stübner return ret; 212c6d81bd7SHeiko Stübner } 213c6d81bd7SHeiko Stübner 214c6d81bd7SHeiko Stübner static int zforce_command_wait(struct zforce_ts *ts, u8 cmd) 215c6d81bd7SHeiko Stübner { 216c6d81bd7SHeiko Stübner struct i2c_client *client = ts->client; 217c6d81bd7SHeiko Stübner char buf[3]; 218c6d81bd7SHeiko Stübner int ret; 219c6d81bd7SHeiko Stübner 220c6d81bd7SHeiko Stübner dev_dbg(&client->dev, "%s: 0x%x\n", __func__, cmd); 221c6d81bd7SHeiko Stübner 222c6d81bd7SHeiko Stübner buf[0] = FRAME_START; 223c6d81bd7SHeiko Stübner buf[1] = 1; /* data size, command only */ 224c6d81bd7SHeiko Stübner buf[2] = cmd; 225c6d81bd7SHeiko Stübner 226c6d81bd7SHeiko Stübner ret = zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); 227c6d81bd7SHeiko Stübner if (ret < 0) { 228c6d81bd7SHeiko Stübner dev_err(&client->dev, "i2c send data request error: %d\n", ret); 229c6d81bd7SHeiko Stübner return ret; 230c6d81bd7SHeiko Stübner } 231c6d81bd7SHeiko Stübner 232c6d81bd7SHeiko Stübner return 0; 233c6d81bd7SHeiko Stübner } 234c6d81bd7SHeiko Stübner 235c6d81bd7SHeiko Stübner static int zforce_resolution(struct zforce_ts *ts, u16 x, u16 y) 236c6d81bd7SHeiko Stübner { 237c6d81bd7SHeiko Stübner struct i2c_client *client = ts->client; 238c6d81bd7SHeiko Stübner char buf[7] = { FRAME_START, 5, COMMAND_RESOLUTION, 239c6d81bd7SHeiko Stübner (x & 0xff), ((x >> 8) & 0xff), 240c6d81bd7SHeiko Stübner (y & 0xff), ((y >> 8) & 0xff) }; 241c6d81bd7SHeiko Stübner 242c6d81bd7SHeiko Stübner dev_dbg(&client->dev, "set resolution to (%d,%d)\n", x, y); 243c6d81bd7SHeiko Stübner 244c6d81bd7SHeiko Stübner return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); 245c6d81bd7SHeiko Stübner } 246c6d81bd7SHeiko Stübner 247c6d81bd7SHeiko Stübner static int zforce_scan_frequency(struct zforce_ts *ts, u16 idle, u16 finger, 248c6d81bd7SHeiko Stübner u16 stylus) 249c6d81bd7SHeiko Stübner { 250c6d81bd7SHeiko Stübner struct i2c_client *client = ts->client; 251c6d81bd7SHeiko Stübner char buf[9] = { FRAME_START, 7, COMMAND_SCANFREQ, 252c6d81bd7SHeiko Stübner (idle & 0xff), ((idle >> 8) & 0xff), 253c6d81bd7SHeiko Stübner (finger & 0xff), ((finger >> 8) & 0xff), 254c6d81bd7SHeiko Stübner (stylus & 0xff), ((stylus >> 8) & 0xff) }; 255c6d81bd7SHeiko Stübner 256ad697b96SLuis Ortega dev_dbg(&client->dev, 257ad697b96SLuis Ortega "set scan frequency to (idle: %d, finger: %d, stylus: %d)\n", 258c6d81bd7SHeiko Stübner idle, finger, stylus); 259c6d81bd7SHeiko Stübner 260c6d81bd7SHeiko Stübner return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); 261c6d81bd7SHeiko Stübner } 262c6d81bd7SHeiko Stübner 263c6d81bd7SHeiko Stübner static int zforce_setconfig(struct zforce_ts *ts, char b1) 264c6d81bd7SHeiko Stübner { 265c6d81bd7SHeiko Stübner struct i2c_client *client = ts->client; 266c6d81bd7SHeiko Stübner char buf[7] = { FRAME_START, 5, COMMAND_SETCONFIG, 267c6d81bd7SHeiko Stübner b1, 0, 0, 0 }; 268c6d81bd7SHeiko Stübner 269c6d81bd7SHeiko Stübner dev_dbg(&client->dev, "set config to (%d)\n", b1); 270c6d81bd7SHeiko Stübner 271c6d81bd7SHeiko Stübner return zforce_send_wait(ts, &buf[0], ARRAY_SIZE(buf)); 272c6d81bd7SHeiko Stübner } 273c6d81bd7SHeiko Stübner 274c6d81bd7SHeiko Stübner static int zforce_start(struct zforce_ts *ts) 275c6d81bd7SHeiko Stübner { 276c6d81bd7SHeiko Stübner struct i2c_client *client = ts->client; 27787273364SHeiko Stübner const struct zforce_ts_platdata *pdata = ts->pdata; 278c6d81bd7SHeiko Stübner int ret; 279c6d81bd7SHeiko Stübner 280c6d81bd7SHeiko Stübner dev_dbg(&client->dev, "starting device\n"); 281c6d81bd7SHeiko Stübner 282c6d81bd7SHeiko Stübner ret = zforce_command_wait(ts, COMMAND_INITIALIZE); 283c6d81bd7SHeiko Stübner if (ret) { 284c6d81bd7SHeiko Stübner dev_err(&client->dev, "Unable to initialize, %d\n", ret); 285c6d81bd7SHeiko Stübner return ret; 286c6d81bd7SHeiko Stübner } 287c6d81bd7SHeiko Stübner 288c6d81bd7SHeiko Stübner ret = zforce_resolution(ts, pdata->x_max, pdata->y_max); 289c6d81bd7SHeiko Stübner if (ret) { 290c6d81bd7SHeiko Stübner dev_err(&client->dev, "Unable to set resolution, %d\n", ret); 291c6d81bd7SHeiko Stübner goto error; 292c6d81bd7SHeiko Stübner } 293c6d81bd7SHeiko Stübner 294c6d81bd7SHeiko Stübner ret = zforce_scan_frequency(ts, 10, 50, 50); 295c6d81bd7SHeiko Stübner if (ret) { 296c6d81bd7SHeiko Stübner dev_err(&client->dev, "Unable to set scan frequency, %d\n", 297c6d81bd7SHeiko Stübner ret); 298c6d81bd7SHeiko Stübner goto error; 299c6d81bd7SHeiko Stübner } 300c6d81bd7SHeiko Stübner 3013c4396b4SWei Yongjun ret = zforce_setconfig(ts, SETCONFIG_DUALTOUCH); 3023c4396b4SWei Yongjun if (ret) { 303c6d81bd7SHeiko Stübner dev_err(&client->dev, "Unable to set config\n"); 304c6d81bd7SHeiko Stübner goto error; 305c6d81bd7SHeiko Stübner } 306c6d81bd7SHeiko Stübner 307c6d81bd7SHeiko Stübner /* start sending touch events */ 308c6d81bd7SHeiko Stübner ret = zforce_command(ts, COMMAND_DATAREQUEST); 309c6d81bd7SHeiko Stübner if (ret) { 310c6d81bd7SHeiko Stübner dev_err(&client->dev, "Unable to request data\n"); 311c6d81bd7SHeiko Stübner goto error; 312c6d81bd7SHeiko Stübner } 313c6d81bd7SHeiko Stübner 314c6d81bd7SHeiko Stübner /* 315c6d81bd7SHeiko Stübner * Per NN, initial cal. take max. of 200msec. 316c6d81bd7SHeiko Stübner * Allow time to complete this calibration 317c6d81bd7SHeiko Stübner */ 318c6d81bd7SHeiko Stübner msleep(200); 319c6d81bd7SHeiko Stübner 320c6d81bd7SHeiko Stübner return 0; 321c6d81bd7SHeiko Stübner 322c6d81bd7SHeiko Stübner error: 323c6d81bd7SHeiko Stübner zforce_command_wait(ts, COMMAND_DEACTIVATE); 324c6d81bd7SHeiko Stübner return ret; 325c6d81bd7SHeiko Stübner } 326c6d81bd7SHeiko Stübner 327c6d81bd7SHeiko Stübner static int zforce_stop(struct zforce_ts *ts) 328c6d81bd7SHeiko Stübner { 329c6d81bd7SHeiko Stübner struct i2c_client *client = ts->client; 330c6d81bd7SHeiko Stübner int ret; 331c6d81bd7SHeiko Stübner 332c6d81bd7SHeiko Stübner dev_dbg(&client->dev, "stopping device\n"); 333c6d81bd7SHeiko Stübner 334c6d81bd7SHeiko Stübner /* Deactivates touch sensing and puts the device into sleep. */ 335c6d81bd7SHeiko Stübner ret = zforce_command_wait(ts, COMMAND_DEACTIVATE); 336c6d81bd7SHeiko Stübner if (ret != 0) { 337c6d81bd7SHeiko Stübner dev_err(&client->dev, "could not deactivate device, %d\n", 338c6d81bd7SHeiko Stübner ret); 339c6d81bd7SHeiko Stübner return ret; 340c6d81bd7SHeiko Stübner } 341c6d81bd7SHeiko Stübner 342c6d81bd7SHeiko Stübner return 0; 343c6d81bd7SHeiko Stübner } 344c6d81bd7SHeiko Stübner 345c6d81bd7SHeiko Stübner static int zforce_touch_event(struct zforce_ts *ts, u8 *payload) 346c6d81bd7SHeiko Stübner { 347c6d81bd7SHeiko Stübner struct i2c_client *client = ts->client; 34887273364SHeiko Stübner const struct zforce_ts_platdata *pdata = ts->pdata; 349c6d81bd7SHeiko Stübner struct zforce_point point; 350c6d81bd7SHeiko Stübner int count, i, num = 0; 351c6d81bd7SHeiko Stübner 352c6d81bd7SHeiko Stübner count = payload[0]; 353c6d81bd7SHeiko Stübner if (count > ZFORCE_REPORT_POINTS) { 354ad697b96SLuis Ortega dev_warn(&client->dev, 355ad697b96SLuis Ortega "too many coordinates %d, expected max %d\n", 356c6d81bd7SHeiko Stübner count, ZFORCE_REPORT_POINTS); 357c6d81bd7SHeiko Stübner count = ZFORCE_REPORT_POINTS; 358c6d81bd7SHeiko Stübner } 359c6d81bd7SHeiko Stübner 360c6d81bd7SHeiko Stübner for (i = 0; i < count; i++) { 361c6d81bd7SHeiko Stübner point.coord_x = 362c6d81bd7SHeiko Stübner payload[9 * i + 2] << 8 | payload[9 * i + 1]; 363c6d81bd7SHeiko Stübner point.coord_y = 364c6d81bd7SHeiko Stübner payload[9 * i + 4] << 8 | payload[9 * i + 3]; 365c6d81bd7SHeiko Stübner 366c6d81bd7SHeiko Stübner if (point.coord_x > pdata->x_max || 367c6d81bd7SHeiko Stübner point.coord_y > pdata->y_max) { 368c6d81bd7SHeiko Stübner dev_warn(&client->dev, "coordinates (%d,%d) invalid\n", 369c6d81bd7SHeiko Stübner point.coord_x, point.coord_y); 370c6d81bd7SHeiko Stübner point.coord_x = point.coord_y = 0; 371c6d81bd7SHeiko Stübner } 372c6d81bd7SHeiko Stübner 373c6d81bd7SHeiko Stübner point.state = payload[9 * i + 5] & 0x03; 374c6d81bd7SHeiko Stübner point.id = (payload[9 * i + 5] & 0xfc) >> 2; 375c6d81bd7SHeiko Stübner 376c6d81bd7SHeiko Stübner /* determine touch major, minor and orientation */ 377c6d81bd7SHeiko Stübner point.area_major = max(payload[9 * i + 6], 378c6d81bd7SHeiko Stübner payload[9 * i + 7]); 379c6d81bd7SHeiko Stübner point.area_minor = min(payload[9 * i + 6], 380c6d81bd7SHeiko Stübner payload[9 * i + 7]); 381c6d81bd7SHeiko Stübner point.orientation = payload[9 * i + 6] > payload[9 * i + 7]; 382c6d81bd7SHeiko Stübner 383c6d81bd7SHeiko Stübner point.pressure = payload[9 * i + 8]; 384c6d81bd7SHeiko Stübner point.prblty = payload[9 * i + 9]; 385c6d81bd7SHeiko Stübner 386c6d81bd7SHeiko Stübner dev_dbg(&client->dev, 387c6d81bd7SHeiko Stübner "point %d/%d: state %d, id %d, pressure %d, prblty %d, x %d, y %d, amajor %d, aminor %d, ori %d\n", 388c6d81bd7SHeiko Stübner i, count, point.state, point.id, 389c6d81bd7SHeiko Stübner point.pressure, point.prblty, 390c6d81bd7SHeiko Stübner point.coord_x, point.coord_y, 391c6d81bd7SHeiko Stübner point.area_major, point.area_minor, 392c6d81bd7SHeiko Stübner point.orientation); 393c6d81bd7SHeiko Stübner 394c6d81bd7SHeiko Stübner /* the zforce id starts with "1", so needs to be decreased */ 395c6d81bd7SHeiko Stübner input_mt_slot(ts->input, point.id - 1); 396c6d81bd7SHeiko Stübner 397c6d81bd7SHeiko Stübner input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, 398c6d81bd7SHeiko Stübner point.state != STATE_UP); 399c6d81bd7SHeiko Stübner 400c6d81bd7SHeiko Stübner if (point.state != STATE_UP) { 401c6d81bd7SHeiko Stübner input_report_abs(ts->input, ABS_MT_POSITION_X, 402c6d81bd7SHeiko Stübner point.coord_x); 403c6d81bd7SHeiko Stübner input_report_abs(ts->input, ABS_MT_POSITION_Y, 404c6d81bd7SHeiko Stübner point.coord_y); 405c6d81bd7SHeiko Stübner input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, 406c6d81bd7SHeiko Stübner point.area_major); 407c6d81bd7SHeiko Stübner input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, 408c6d81bd7SHeiko Stübner point.area_minor); 409c6d81bd7SHeiko Stübner input_report_abs(ts->input, ABS_MT_ORIENTATION, 410c6d81bd7SHeiko Stübner point.orientation); 411c6d81bd7SHeiko Stübner num++; 412c6d81bd7SHeiko Stübner } 413c6d81bd7SHeiko Stübner } 414c6d81bd7SHeiko Stübner 415c6d81bd7SHeiko Stübner input_mt_sync_frame(ts->input); 416c6d81bd7SHeiko Stübner 417c6d81bd7SHeiko Stübner input_mt_report_finger_count(ts->input, num); 418c6d81bd7SHeiko Stübner 419c6d81bd7SHeiko Stübner input_sync(ts->input); 420c6d81bd7SHeiko Stübner 421c6d81bd7SHeiko Stübner return 0; 422c6d81bd7SHeiko Stübner } 423c6d81bd7SHeiko Stübner 424c6d81bd7SHeiko Stübner static int zforce_read_packet(struct zforce_ts *ts, u8 *buf) 425c6d81bd7SHeiko Stübner { 426c6d81bd7SHeiko Stübner struct i2c_client *client = ts->client; 427c6d81bd7SHeiko Stübner int ret; 428c6d81bd7SHeiko Stübner 429c6d81bd7SHeiko Stübner mutex_lock(&ts->access_mutex); 430c6d81bd7SHeiko Stübner 431c6d81bd7SHeiko Stübner /* read 2 byte message header */ 432c6d81bd7SHeiko Stübner ret = i2c_master_recv(client, buf, 2); 433c6d81bd7SHeiko Stübner if (ret < 0) { 434c6d81bd7SHeiko Stübner dev_err(&client->dev, "error reading header: %d\n", ret); 435c6d81bd7SHeiko Stübner goto unlock; 436c6d81bd7SHeiko Stübner } 437c6d81bd7SHeiko Stübner 438c6d81bd7SHeiko Stübner if (buf[PAYLOAD_HEADER] != FRAME_START) { 439c6d81bd7SHeiko Stübner dev_err(&client->dev, "invalid frame start: %d\n", buf[0]); 440c6d81bd7SHeiko Stübner ret = -EIO; 441c6d81bd7SHeiko Stübner goto unlock; 442c6d81bd7SHeiko Stübner } 443c6d81bd7SHeiko Stübner 4445aee41a6SLuis Ortega if (buf[PAYLOAD_LENGTH] == 0) { 445c6d81bd7SHeiko Stübner dev_err(&client->dev, "invalid payload length: %d\n", 446c6d81bd7SHeiko Stübner buf[PAYLOAD_LENGTH]); 447c6d81bd7SHeiko Stübner ret = -EIO; 448c6d81bd7SHeiko Stübner goto unlock; 449c6d81bd7SHeiko Stübner } 450c6d81bd7SHeiko Stübner 451c6d81bd7SHeiko Stübner /* read the message */ 452c6d81bd7SHeiko Stübner ret = i2c_master_recv(client, &buf[PAYLOAD_BODY], buf[PAYLOAD_LENGTH]); 453c6d81bd7SHeiko Stübner if (ret < 0) { 454c6d81bd7SHeiko Stübner dev_err(&client->dev, "error reading payload: %d\n", ret); 455c6d81bd7SHeiko Stübner goto unlock; 456c6d81bd7SHeiko Stübner } 457c6d81bd7SHeiko Stübner 458c6d81bd7SHeiko Stübner dev_dbg(&client->dev, "read %d bytes for response command 0x%x\n", 459c6d81bd7SHeiko Stübner buf[PAYLOAD_LENGTH], buf[PAYLOAD_BODY]); 460c6d81bd7SHeiko Stübner 461c6d81bd7SHeiko Stübner unlock: 462c6d81bd7SHeiko Stübner mutex_unlock(&ts->access_mutex); 463c6d81bd7SHeiko Stübner return ret; 464c6d81bd7SHeiko Stübner } 465c6d81bd7SHeiko Stübner 466c6d81bd7SHeiko Stübner static void zforce_complete(struct zforce_ts *ts, int cmd, int result) 467c6d81bd7SHeiko Stübner { 468c6d81bd7SHeiko Stübner struct i2c_client *client = ts->client; 469c6d81bd7SHeiko Stübner 470c6d81bd7SHeiko Stübner if (ts->command_waiting == cmd) { 471c6d81bd7SHeiko Stübner dev_dbg(&client->dev, "completing command 0x%x\n", cmd); 472c6d81bd7SHeiko Stübner ts->command_result = result; 473c6d81bd7SHeiko Stübner complete(&ts->command_done); 474c6d81bd7SHeiko Stübner } else { 475c6d81bd7SHeiko Stübner dev_dbg(&client->dev, "command %d not for us\n", cmd); 476c6d81bd7SHeiko Stübner } 477c6d81bd7SHeiko Stübner } 478c6d81bd7SHeiko Stübner 479499e6127SHeiko Stübner static irqreturn_t zforce_irq(int irq, void *dev_id) 480499e6127SHeiko Stübner { 481499e6127SHeiko Stübner struct zforce_ts *ts = dev_id; 482499e6127SHeiko Stübner struct i2c_client *client = ts->client; 483499e6127SHeiko Stübner 484499e6127SHeiko Stübner if (ts->suspended && device_may_wakeup(&client->dev)) 485499e6127SHeiko Stübner pm_wakeup_event(&client->dev, 500); 486499e6127SHeiko Stübner 487499e6127SHeiko Stübner return IRQ_WAKE_THREAD; 488499e6127SHeiko Stübner } 489499e6127SHeiko Stübner 490499e6127SHeiko Stübner static irqreturn_t zforce_irq_thread(int irq, void *dev_id) 491c6d81bd7SHeiko Stübner { 492c6d81bd7SHeiko Stübner struct zforce_ts *ts = dev_id; 493c6d81bd7SHeiko Stübner struct i2c_client *client = ts->client; 494c6d81bd7SHeiko Stübner int ret; 495d333b606SLuis Ortega u8 payload_buffer[FRAME_MAXSIZE]; 496c6d81bd7SHeiko Stübner u8 *payload; 497c6d81bd7SHeiko Stübner 498c6d81bd7SHeiko Stübner /* 499499e6127SHeiko Stübner * When still suspended, return. 500c6d81bd7SHeiko Stübner * Due to the level-interrupt we will get re-triggered later. 501c6d81bd7SHeiko Stübner */ 502c6d81bd7SHeiko Stübner if (ts->suspended) { 503c6d81bd7SHeiko Stübner msleep(20); 504c6d81bd7SHeiko Stübner return IRQ_HANDLED; 505c6d81bd7SHeiko Stübner } 506c6d81bd7SHeiko Stübner 507c6d81bd7SHeiko Stübner dev_dbg(&client->dev, "handling interrupt\n"); 508c6d81bd7SHeiko Stübner 509c6d81bd7SHeiko Stübner /* Don't emit wakeup events from commands run by zforce_suspend */ 510c6d81bd7SHeiko Stübner if (!ts->suspending && device_may_wakeup(&client->dev)) 511c6d81bd7SHeiko Stübner pm_stay_awake(&client->dev); 512c6d81bd7SHeiko Stübner 51362f46669SDirk Behme /* 51462f46669SDirk Behme * Run at least once and exit the loop if 51562f46669SDirk Behme * - the optional interrupt GPIO isn't specified 51662f46669SDirk Behme * (there is only one packet read per ISR invocation, then) 51762f46669SDirk Behme * or 51862f46669SDirk Behme * - the GPIO isn't active any more 51962f46669SDirk Behme * (packet read until the level GPIO indicates that there is 52062f46669SDirk Behme * no IRQ any more) 52162f46669SDirk Behme */ 52262f46669SDirk Behme do { 523c6d81bd7SHeiko Stübner ret = zforce_read_packet(ts, payload_buffer); 524c6d81bd7SHeiko Stübner if (ret < 0) { 525ad697b96SLuis Ortega dev_err(&client->dev, 526ad697b96SLuis Ortega "could not read packet, ret: %d\n", ret); 527c6d81bd7SHeiko Stübner break; 528c6d81bd7SHeiko Stübner } 529c6d81bd7SHeiko Stübner 530c6d81bd7SHeiko Stübner payload = &payload_buffer[PAYLOAD_BODY]; 531c6d81bd7SHeiko Stübner 532c6d81bd7SHeiko Stübner switch (payload[RESPONSE_ID]) { 533c6d81bd7SHeiko Stübner case NOTIFICATION_TOUCH: 534c6d81bd7SHeiko Stübner /* 535c6d81bd7SHeiko Stübner * Always report touch-events received while 536c6d81bd7SHeiko Stübner * suspending, when being a wakeup source 537c6d81bd7SHeiko Stübner */ 538c6d81bd7SHeiko Stübner if (ts->suspending && device_may_wakeup(&client->dev)) 539c6d81bd7SHeiko Stübner pm_wakeup_event(&client->dev, 500); 540c6d81bd7SHeiko Stübner zforce_touch_event(ts, &payload[RESPONSE_DATA]); 541c6d81bd7SHeiko Stübner break; 542c6d81bd7SHeiko Stübner 543c6d81bd7SHeiko Stübner case NOTIFICATION_BOOTCOMPLETE: 544c6d81bd7SHeiko Stübner ts->boot_complete = payload[RESPONSE_DATA]; 545c6d81bd7SHeiko Stübner zforce_complete(ts, payload[RESPONSE_ID], 0); 546c6d81bd7SHeiko Stübner break; 547c6d81bd7SHeiko Stübner 548c6d81bd7SHeiko Stübner case RESPONSE_INITIALIZE: 549c6d81bd7SHeiko Stübner case RESPONSE_DEACTIVATE: 550c6d81bd7SHeiko Stübner case RESPONSE_SETCONFIG: 551c6d81bd7SHeiko Stübner case RESPONSE_RESOLUTION: 552c6d81bd7SHeiko Stübner case RESPONSE_SCANFREQ: 553c6d81bd7SHeiko Stübner zforce_complete(ts, payload[RESPONSE_ID], 554c6d81bd7SHeiko Stübner payload[RESPONSE_DATA]); 555c6d81bd7SHeiko Stübner break; 556c6d81bd7SHeiko Stübner 557c6d81bd7SHeiko Stübner case RESPONSE_STATUS: 558c6d81bd7SHeiko Stübner /* 559c6d81bd7SHeiko Stübner * Version Payload Results 560c6d81bd7SHeiko Stübner * [2:major] [2:minor] [2:build] [2:rev] 561c6d81bd7SHeiko Stübner */ 562c6d81bd7SHeiko Stübner ts->version_major = (payload[RESPONSE_DATA + 1] << 8) | 563c6d81bd7SHeiko Stübner payload[RESPONSE_DATA]; 564c6d81bd7SHeiko Stübner ts->version_minor = (payload[RESPONSE_DATA + 3] << 8) | 565c6d81bd7SHeiko Stübner payload[RESPONSE_DATA + 2]; 566c6d81bd7SHeiko Stübner ts->version_build = (payload[RESPONSE_DATA + 5] << 8) | 567c6d81bd7SHeiko Stübner payload[RESPONSE_DATA + 4]; 568c6d81bd7SHeiko Stübner ts->version_rev = (payload[RESPONSE_DATA + 7] << 8) | 569c6d81bd7SHeiko Stübner payload[RESPONSE_DATA + 6]; 570ad697b96SLuis Ortega dev_dbg(&ts->client->dev, 571ad697b96SLuis Ortega "Firmware Version %04x:%04x %04x:%04x\n", 572c6d81bd7SHeiko Stübner ts->version_major, ts->version_minor, 573c6d81bd7SHeiko Stübner ts->version_build, ts->version_rev); 574c6d81bd7SHeiko Stübner 575c6d81bd7SHeiko Stübner zforce_complete(ts, payload[RESPONSE_ID], 0); 576c6d81bd7SHeiko Stübner break; 577c6d81bd7SHeiko Stübner 578c6d81bd7SHeiko Stübner case NOTIFICATION_INVALID_COMMAND: 579c6d81bd7SHeiko Stübner dev_err(&ts->client->dev, "invalid command: 0x%x\n", 580c6d81bd7SHeiko Stübner payload[RESPONSE_DATA]); 581c6d81bd7SHeiko Stübner break; 582c6d81bd7SHeiko Stübner 583c6d81bd7SHeiko Stübner default: 584ad697b96SLuis Ortega dev_err(&ts->client->dev, 585ad697b96SLuis Ortega "unrecognized response id: 0x%x\n", 586c6d81bd7SHeiko Stübner payload[RESPONSE_ID]); 587c6d81bd7SHeiko Stübner break; 588c6d81bd7SHeiko Stübner } 58962f46669SDirk Behme } while (gpiod_get_value_cansleep(ts->gpio_int)); 590c6d81bd7SHeiko Stübner 591c6d81bd7SHeiko Stübner if (!ts->suspending && device_may_wakeup(&client->dev)) 592c6d81bd7SHeiko Stübner pm_relax(&client->dev); 593c6d81bd7SHeiko Stübner 594c6d81bd7SHeiko Stübner dev_dbg(&client->dev, "finished interrupt\n"); 595c6d81bd7SHeiko Stübner 596c6d81bd7SHeiko Stübner return IRQ_HANDLED; 597c6d81bd7SHeiko Stübner } 598c6d81bd7SHeiko Stübner 599c6d81bd7SHeiko Stübner static int zforce_input_open(struct input_dev *dev) 600c6d81bd7SHeiko Stübner { 601c6d81bd7SHeiko Stübner struct zforce_ts *ts = input_get_drvdata(dev); 602c6d81bd7SHeiko Stübner int ret; 603c6d81bd7SHeiko Stübner 604c6d81bd7SHeiko Stübner ret = zforce_start(ts); 605c6d81bd7SHeiko Stübner if (ret) 606c6d81bd7SHeiko Stübner return ret; 607c6d81bd7SHeiko Stübner 608c6d81bd7SHeiko Stübner return 0; 609c6d81bd7SHeiko Stübner } 610c6d81bd7SHeiko Stübner 611c6d81bd7SHeiko Stübner static void zforce_input_close(struct input_dev *dev) 612c6d81bd7SHeiko Stübner { 613c6d81bd7SHeiko Stübner struct zforce_ts *ts = input_get_drvdata(dev); 614c6d81bd7SHeiko Stübner struct i2c_client *client = ts->client; 615c6d81bd7SHeiko Stübner int ret; 616c6d81bd7SHeiko Stübner 617c6d81bd7SHeiko Stübner ret = zforce_stop(ts); 618c6d81bd7SHeiko Stübner if (ret) 619c6d81bd7SHeiko Stübner dev_warn(&client->dev, "stopping zforce failed\n"); 620c6d81bd7SHeiko Stübner 621c6d81bd7SHeiko Stübner return; 622c6d81bd7SHeiko Stübner } 623c6d81bd7SHeiko Stübner 62402b6a58bSJingoo Han static int __maybe_unused zforce_suspend(struct device *dev) 625c6d81bd7SHeiko Stübner { 626c6d81bd7SHeiko Stübner struct i2c_client *client = to_i2c_client(dev); 627c6d81bd7SHeiko Stübner struct zforce_ts *ts = i2c_get_clientdata(client); 628c6d81bd7SHeiko Stübner struct input_dev *input = ts->input; 629c6d81bd7SHeiko Stübner int ret = 0; 630c6d81bd7SHeiko Stübner 631c6d81bd7SHeiko Stübner mutex_lock(&input->mutex); 632c6d81bd7SHeiko Stübner ts->suspending = true; 633c6d81bd7SHeiko Stübner 634c6d81bd7SHeiko Stübner /* 635c6d81bd7SHeiko Stübner * When configured as a wakeup source device should always wake 636c6d81bd7SHeiko Stübner * the system, therefore start device if necessary. 637c6d81bd7SHeiko Stübner */ 638c6d81bd7SHeiko Stübner if (device_may_wakeup(&client->dev)) { 639c6d81bd7SHeiko Stübner dev_dbg(&client->dev, "suspend while being a wakeup source\n"); 640c6d81bd7SHeiko Stübner 641c6d81bd7SHeiko Stübner /* Need to start device, if not open, to be a wakeup source. */ 642c6d81bd7SHeiko Stübner if (!input->users) { 643c6d81bd7SHeiko Stübner ret = zforce_start(ts); 644c6d81bd7SHeiko Stübner if (ret) 645c6d81bd7SHeiko Stübner goto unlock; 646c6d81bd7SHeiko Stübner } 647c6d81bd7SHeiko Stübner 648c6d81bd7SHeiko Stübner enable_irq_wake(client->irq); 649c6d81bd7SHeiko Stübner } else if (input->users) { 650ad697b96SLuis Ortega dev_dbg(&client->dev, 651ad697b96SLuis Ortega "suspend without being a wakeup source\n"); 652c6d81bd7SHeiko Stübner 653c6d81bd7SHeiko Stübner ret = zforce_stop(ts); 654c6d81bd7SHeiko Stübner if (ret) 655c6d81bd7SHeiko Stübner goto unlock; 656c6d81bd7SHeiko Stübner 657c6d81bd7SHeiko Stübner disable_irq(client->irq); 658c6d81bd7SHeiko Stübner } 659c6d81bd7SHeiko Stübner 660c6d81bd7SHeiko Stübner ts->suspended = true; 661c6d81bd7SHeiko Stübner 662c6d81bd7SHeiko Stübner unlock: 663c6d81bd7SHeiko Stübner ts->suspending = false; 664c6d81bd7SHeiko Stübner mutex_unlock(&input->mutex); 665c6d81bd7SHeiko Stübner 666c6d81bd7SHeiko Stübner return ret; 667c6d81bd7SHeiko Stübner } 668c6d81bd7SHeiko Stübner 66902b6a58bSJingoo Han static int __maybe_unused zforce_resume(struct device *dev) 670c6d81bd7SHeiko Stübner { 671c6d81bd7SHeiko Stübner struct i2c_client *client = to_i2c_client(dev); 672c6d81bd7SHeiko Stübner struct zforce_ts *ts = i2c_get_clientdata(client); 673c6d81bd7SHeiko Stübner struct input_dev *input = ts->input; 674c6d81bd7SHeiko Stübner int ret = 0; 675c6d81bd7SHeiko Stübner 676c6d81bd7SHeiko Stübner mutex_lock(&input->mutex); 677c6d81bd7SHeiko Stübner 678c6d81bd7SHeiko Stübner ts->suspended = false; 679c6d81bd7SHeiko Stübner 680c6d81bd7SHeiko Stübner if (device_may_wakeup(&client->dev)) { 681c6d81bd7SHeiko Stübner dev_dbg(&client->dev, "resume from being a wakeup source\n"); 682c6d81bd7SHeiko Stübner 683c6d81bd7SHeiko Stübner disable_irq_wake(client->irq); 684c6d81bd7SHeiko Stübner 685c6d81bd7SHeiko Stübner /* need to stop device if it was not open on suspend */ 686c6d81bd7SHeiko Stübner if (!input->users) { 687c6d81bd7SHeiko Stübner ret = zforce_stop(ts); 688c6d81bd7SHeiko Stübner if (ret) 689c6d81bd7SHeiko Stübner goto unlock; 690c6d81bd7SHeiko Stübner } 691c6d81bd7SHeiko Stübner } else if (input->users) { 692c6d81bd7SHeiko Stübner dev_dbg(&client->dev, "resume without being a wakeup source\n"); 693c6d81bd7SHeiko Stübner 694c6d81bd7SHeiko Stübner enable_irq(client->irq); 695c6d81bd7SHeiko Stübner 696c6d81bd7SHeiko Stübner ret = zforce_start(ts); 697c6d81bd7SHeiko Stübner if (ret < 0) 698c6d81bd7SHeiko Stübner goto unlock; 699c6d81bd7SHeiko Stübner } 700c6d81bd7SHeiko Stübner 701c6d81bd7SHeiko Stübner unlock: 702c6d81bd7SHeiko Stübner mutex_unlock(&input->mutex); 703c6d81bd7SHeiko Stübner 704c6d81bd7SHeiko Stübner return ret; 705c6d81bd7SHeiko Stübner } 706c6d81bd7SHeiko Stübner 707c6d81bd7SHeiko Stübner static SIMPLE_DEV_PM_OPS(zforce_pm_ops, zforce_suspend, zforce_resume); 708c6d81bd7SHeiko Stübner 709c6d81bd7SHeiko Stübner static void zforce_reset(void *data) 710c6d81bd7SHeiko Stübner { 711c6d81bd7SHeiko Stübner struct zforce_ts *ts = data; 712c6d81bd7SHeiko Stübner 7132d538095SDirk Behme zforce_reset_assert(ts); 71439740370SHeiko Stuebner 71539740370SHeiko Stuebner udelay(10); 71639740370SHeiko Stuebner 71739740370SHeiko Stuebner if (!IS_ERR(ts->reg_vdd)) 71839740370SHeiko Stuebner regulator_disable(ts->reg_vdd); 719c6d81bd7SHeiko Stübner } 720c6d81bd7SHeiko Stübner 7216f2e6c9bSHeiko Stübner static struct zforce_ts_platdata *zforce_parse_dt(struct device *dev) 7226f2e6c9bSHeiko Stübner { 7236f2e6c9bSHeiko Stübner struct zforce_ts_platdata *pdata; 7246f2e6c9bSHeiko Stübner struct device_node *np = dev->of_node; 7256f2e6c9bSHeiko Stübner 7266f2e6c9bSHeiko Stübner if (!np) 7276f2e6c9bSHeiko Stübner return ERR_PTR(-ENOENT); 7286f2e6c9bSHeiko Stübner 7296f2e6c9bSHeiko Stübner pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 7306f2e6c9bSHeiko Stübner if (!pdata) { 7316f2e6c9bSHeiko Stübner dev_err(dev, "failed to allocate platform data\n"); 7326f2e6c9bSHeiko Stübner return ERR_PTR(-ENOMEM); 7336f2e6c9bSHeiko Stübner } 7346f2e6c9bSHeiko Stübner 7356f2e6c9bSHeiko Stübner if (of_property_read_u32(np, "x-size", &pdata->x_max)) { 7366f2e6c9bSHeiko Stübner dev_err(dev, "failed to get x-size property\n"); 7376f2e6c9bSHeiko Stübner return ERR_PTR(-EINVAL); 7386f2e6c9bSHeiko Stübner } 7396f2e6c9bSHeiko Stübner 7406f2e6c9bSHeiko Stübner if (of_property_read_u32(np, "y-size", &pdata->y_max)) { 7416f2e6c9bSHeiko Stübner dev_err(dev, "failed to get y-size property\n"); 7426f2e6c9bSHeiko Stübner return ERR_PTR(-EINVAL); 7436f2e6c9bSHeiko Stübner } 7446f2e6c9bSHeiko Stübner 7456f2e6c9bSHeiko Stübner return pdata; 7466f2e6c9bSHeiko Stübner } 7476f2e6c9bSHeiko Stübner 748c6d81bd7SHeiko Stübner static int zforce_probe(struct i2c_client *client, 749c6d81bd7SHeiko Stübner const struct i2c_device_id *id) 750c6d81bd7SHeiko Stübner { 751c6d81bd7SHeiko Stübner const struct zforce_ts_platdata *pdata = dev_get_platdata(&client->dev); 752c6d81bd7SHeiko Stübner struct zforce_ts *ts; 753c6d81bd7SHeiko Stübner struct input_dev *input_dev; 754c6d81bd7SHeiko Stübner int ret; 755c6d81bd7SHeiko Stübner 7566f2e6c9bSHeiko Stübner if (!pdata) { 7576f2e6c9bSHeiko Stübner pdata = zforce_parse_dt(&client->dev); 7586f2e6c9bSHeiko Stübner if (IS_ERR(pdata)) 7596f2e6c9bSHeiko Stübner return PTR_ERR(pdata); 7606f2e6c9bSHeiko Stübner } 761c6d81bd7SHeiko Stübner 762c6d81bd7SHeiko Stübner ts = devm_kzalloc(&client->dev, sizeof(struct zforce_ts), GFP_KERNEL); 763c6d81bd7SHeiko Stübner if (!ts) 764c6d81bd7SHeiko Stübner return -ENOMEM; 765c6d81bd7SHeiko Stübner 76662f46669SDirk Behme ts->gpio_rst = devm_gpiod_get_optional(&client->dev, "reset", 76762f46669SDirk Behme GPIOD_OUT_HIGH); 76862f46669SDirk Behme if (IS_ERR(ts->gpio_rst)) { 76962f46669SDirk Behme ret = PTR_ERR(ts->gpio_rst); 77062f46669SDirk Behme dev_err(&client->dev, 77162f46669SDirk Behme "failed to request reset GPIO: %d\n", ret); 77262f46669SDirk Behme return ret; 77362f46669SDirk Behme } 77462f46669SDirk Behme 77562f46669SDirk Behme if (ts->gpio_rst) { 77662f46669SDirk Behme ts->gpio_int = devm_gpiod_get_optional(&client->dev, "irq", 77762f46669SDirk Behme GPIOD_IN); 77862f46669SDirk Behme if (IS_ERR(ts->gpio_int)) { 77962f46669SDirk Behme ret = PTR_ERR(ts->gpio_int); 78062f46669SDirk Behme dev_err(&client->dev, 78162f46669SDirk Behme "failed to request interrupt GPIO: %d\n", ret); 78262f46669SDirk Behme return ret; 78362f46669SDirk Behme } 78462f46669SDirk Behme } else { 78562f46669SDirk Behme /* 78662f46669SDirk Behme * Deprecated GPIO handling for compatibility 78762f46669SDirk Behme * with legacy binding. 78862f46669SDirk Behme */ 78962f46669SDirk Behme 7902d538095SDirk Behme /* INT GPIO */ 79162f46669SDirk Behme ts->gpio_int = devm_gpiod_get_index(&client->dev, NULL, 0, 79262f46669SDirk Behme GPIOD_IN); 7932d538095SDirk Behme if (IS_ERR(ts->gpio_int)) { 7942d538095SDirk Behme ret = PTR_ERR(ts->gpio_int); 7952d538095SDirk Behme dev_err(&client->dev, 7962d538095SDirk Behme "failed to request interrupt GPIO: %d\n", ret); 797c6d81bd7SHeiko Stübner return ret; 798c6d81bd7SHeiko Stübner } 799c6d81bd7SHeiko Stübner 8002d538095SDirk Behme /* RST GPIO */ 8012d538095SDirk Behme ts->gpio_rst = devm_gpiod_get_index(&client->dev, NULL, 1, 8022d538095SDirk Behme GPIOD_OUT_HIGH); 8032d538095SDirk Behme if (IS_ERR(ts->gpio_rst)) { 8042d538095SDirk Behme ret = PTR_ERR(ts->gpio_rst); 8052d538095SDirk Behme dev_err(&client->dev, 8062d538095SDirk Behme "failed to request reset GPIO: %d\n", ret); 807c6d81bd7SHeiko Stübner return ret; 808c6d81bd7SHeiko Stübner } 80962f46669SDirk Behme } 810c6d81bd7SHeiko Stübner 81139740370SHeiko Stuebner ts->reg_vdd = devm_regulator_get_optional(&client->dev, "vdd"); 81239740370SHeiko Stuebner if (IS_ERR(ts->reg_vdd)) { 81339740370SHeiko Stuebner ret = PTR_ERR(ts->reg_vdd); 81439740370SHeiko Stuebner if (ret == -EPROBE_DEFER) 81539740370SHeiko Stuebner return ret; 81639740370SHeiko Stuebner } else { 81739740370SHeiko Stuebner ret = regulator_enable(ts->reg_vdd); 81839740370SHeiko Stuebner if (ret) 81939740370SHeiko Stuebner return ret; 82039740370SHeiko Stuebner 82139740370SHeiko Stuebner /* 82239740370SHeiko Stuebner * according to datasheet add 100us grace time after regular 82339740370SHeiko Stuebner * regulator enable delay. 82439740370SHeiko Stuebner */ 82539740370SHeiko Stuebner udelay(100); 82639740370SHeiko Stuebner } 82739740370SHeiko Stuebner 828c6d81bd7SHeiko Stübner ret = devm_add_action(&client->dev, zforce_reset, ts); 829c6d81bd7SHeiko Stübner if (ret) { 830c6d81bd7SHeiko Stübner dev_err(&client->dev, "failed to register reset action, %d\n", 831c6d81bd7SHeiko Stübner ret); 83239740370SHeiko Stuebner 83339740370SHeiko Stuebner /* hereafter the regulator will be disabled by the action */ 83439740370SHeiko Stuebner if (!IS_ERR(ts->reg_vdd)) 83539740370SHeiko Stuebner regulator_disable(ts->reg_vdd); 83639740370SHeiko Stuebner 837c6d81bd7SHeiko Stübner return ret; 838c6d81bd7SHeiko Stübner } 839c6d81bd7SHeiko Stübner 840c6d81bd7SHeiko Stübner snprintf(ts->phys, sizeof(ts->phys), 841c6d81bd7SHeiko Stübner "%s/input0", dev_name(&client->dev)); 842c6d81bd7SHeiko Stübner 843c6d81bd7SHeiko Stübner input_dev = devm_input_allocate_device(&client->dev); 844c6d81bd7SHeiko Stübner if (!input_dev) { 845c6d81bd7SHeiko Stübner dev_err(&client->dev, "could not allocate input device\n"); 846c6d81bd7SHeiko Stübner return -ENOMEM; 847c6d81bd7SHeiko Stübner } 848c6d81bd7SHeiko Stübner 849c6d81bd7SHeiko Stübner mutex_init(&ts->access_mutex); 850c6d81bd7SHeiko Stübner mutex_init(&ts->command_mutex); 851c6d81bd7SHeiko Stübner 852c6d81bd7SHeiko Stübner ts->pdata = pdata; 853c6d81bd7SHeiko Stübner ts->client = client; 854c6d81bd7SHeiko Stübner ts->input = input_dev; 855c6d81bd7SHeiko Stübner 856c6d81bd7SHeiko Stübner input_dev->name = "Neonode zForce touchscreen"; 857c6d81bd7SHeiko Stübner input_dev->phys = ts->phys; 858c6d81bd7SHeiko Stübner input_dev->id.bustype = BUS_I2C; 859c6d81bd7SHeiko Stübner 860c6d81bd7SHeiko Stübner input_dev->open = zforce_input_open; 861c6d81bd7SHeiko Stübner input_dev->close = zforce_input_close; 862c6d81bd7SHeiko Stübner 863c6d81bd7SHeiko Stübner __set_bit(EV_KEY, input_dev->evbit); 864c6d81bd7SHeiko Stübner __set_bit(EV_SYN, input_dev->evbit); 865c6d81bd7SHeiko Stübner __set_bit(EV_ABS, input_dev->evbit); 866c6d81bd7SHeiko Stübner 867c6d81bd7SHeiko Stübner /* For multi touch */ 868c6d81bd7SHeiko Stübner input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0, 869c6d81bd7SHeiko Stübner pdata->x_max, 0, 0); 870c6d81bd7SHeiko Stübner input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0, 871c6d81bd7SHeiko Stübner pdata->y_max, 0, 0); 872c6d81bd7SHeiko Stübner 873c6d81bd7SHeiko Stübner input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, 874c6d81bd7SHeiko Stübner ZFORCE_MAX_AREA, 0, 0); 875c6d81bd7SHeiko Stübner input_set_abs_params(input_dev, ABS_MT_TOUCH_MINOR, 0, 876c6d81bd7SHeiko Stübner ZFORCE_MAX_AREA, 0, 0); 877c6d81bd7SHeiko Stübner input_set_abs_params(input_dev, ABS_MT_ORIENTATION, 0, 1, 0, 0); 878c6d81bd7SHeiko Stübner input_mt_init_slots(input_dev, ZFORCE_REPORT_POINTS, INPUT_MT_DIRECT); 879c6d81bd7SHeiko Stübner 880c6d81bd7SHeiko Stübner input_set_drvdata(ts->input, ts); 881c6d81bd7SHeiko Stübner 882c6d81bd7SHeiko Stübner init_completion(&ts->command_done); 883c6d81bd7SHeiko Stübner 884c6d81bd7SHeiko Stübner /* 885c6d81bd7SHeiko Stübner * The zforce pulls the interrupt low when it has data ready. 886c6d81bd7SHeiko Stübner * After it is triggered the isr thread runs until all the available 887c6d81bd7SHeiko Stübner * packets have been read and the interrupt is high again. 888c6d81bd7SHeiko Stübner * Therefore we can trigger the interrupt anytime it is low and do 889c6d81bd7SHeiko Stübner * not need to limit it to the interrupt edge. 890c6d81bd7SHeiko Stübner */ 891499e6127SHeiko Stübner ret = devm_request_threaded_irq(&client->dev, client->irq, 892499e6127SHeiko Stübner zforce_irq, zforce_irq_thread, 893c6d81bd7SHeiko Stübner IRQF_TRIGGER_LOW | IRQF_ONESHOT, 894c6d81bd7SHeiko Stübner input_dev->name, ts); 895c6d81bd7SHeiko Stübner if (ret) { 896c6d81bd7SHeiko Stübner dev_err(&client->dev, "irq %d request failed\n", client->irq); 897c6d81bd7SHeiko Stübner return ret; 898c6d81bd7SHeiko Stübner } 899c6d81bd7SHeiko Stübner 900c6d81bd7SHeiko Stübner i2c_set_clientdata(client, ts); 901c6d81bd7SHeiko Stübner 902c6d81bd7SHeiko Stübner /* let the controller boot */ 9032d538095SDirk Behme zforce_reset_deassert(ts); 904c6d81bd7SHeiko Stübner 905c6d81bd7SHeiko Stübner ts->command_waiting = NOTIFICATION_BOOTCOMPLETE; 906c6d81bd7SHeiko Stübner if (wait_for_completion_timeout(&ts->command_done, WAIT_TIMEOUT) == 0) 907c6d81bd7SHeiko Stübner dev_warn(&client->dev, "bootcomplete timed out\n"); 908c6d81bd7SHeiko Stübner 909c6d81bd7SHeiko Stübner /* need to start device to get version information */ 910c6d81bd7SHeiko Stübner ret = zforce_command_wait(ts, COMMAND_INITIALIZE); 911c6d81bd7SHeiko Stübner if (ret) { 912c6d81bd7SHeiko Stübner dev_err(&client->dev, "unable to initialize, %d\n", ret); 913c6d81bd7SHeiko Stübner return ret; 914c6d81bd7SHeiko Stübner } 915c6d81bd7SHeiko Stübner 916deb49819SLuis Ortega /* this gets the firmware version among other information */ 917c6d81bd7SHeiko Stübner ret = zforce_command_wait(ts, COMMAND_STATUS); 918c6d81bd7SHeiko Stübner if (ret < 0) { 919c6d81bd7SHeiko Stübner dev_err(&client->dev, "couldn't get status, %d\n", ret); 920c6d81bd7SHeiko Stübner zforce_stop(ts); 921c6d81bd7SHeiko Stübner return ret; 922c6d81bd7SHeiko Stübner } 923c6d81bd7SHeiko Stübner 924c6d81bd7SHeiko Stübner /* stop device and put it into sleep until it is opened */ 925c6d81bd7SHeiko Stübner ret = zforce_stop(ts); 926c6d81bd7SHeiko Stübner if (ret < 0) 927c6d81bd7SHeiko Stübner return ret; 928c6d81bd7SHeiko Stübner 929c6d81bd7SHeiko Stübner device_set_wakeup_capable(&client->dev, true); 930c6d81bd7SHeiko Stübner 931c6d81bd7SHeiko Stübner ret = input_register_device(input_dev); 932c6d81bd7SHeiko Stübner if (ret) { 933c6d81bd7SHeiko Stübner dev_err(&client->dev, "could not register input device, %d\n", 934c6d81bd7SHeiko Stübner ret); 935c6d81bd7SHeiko Stübner return ret; 936c6d81bd7SHeiko Stübner } 937c6d81bd7SHeiko Stübner 938c6d81bd7SHeiko Stübner return 0; 939c6d81bd7SHeiko Stübner } 940c6d81bd7SHeiko Stübner 941c6d81bd7SHeiko Stübner static struct i2c_device_id zforce_idtable[] = { 942c6d81bd7SHeiko Stübner { "zforce-ts", 0 }, 943c6d81bd7SHeiko Stübner { } 944c6d81bd7SHeiko Stübner }; 945c6d81bd7SHeiko Stübner MODULE_DEVICE_TABLE(i2c, zforce_idtable); 946c6d81bd7SHeiko Stübner 9476f2e6c9bSHeiko Stübner #ifdef CONFIG_OF 948f3f63193SJingoo Han static const struct of_device_id zforce_dt_idtable[] = { 9496f2e6c9bSHeiko Stübner { .compatible = "neonode,zforce" }, 9506f2e6c9bSHeiko Stübner {}, 9516f2e6c9bSHeiko Stübner }; 9526f2e6c9bSHeiko Stübner MODULE_DEVICE_TABLE(of, zforce_dt_idtable); 9536f2e6c9bSHeiko Stübner #endif 9546f2e6c9bSHeiko Stübner 955c6d81bd7SHeiko Stübner static struct i2c_driver zforce_driver = { 956c6d81bd7SHeiko Stübner .driver = { 957c6d81bd7SHeiko Stübner .name = "zforce-ts", 958c6d81bd7SHeiko Stübner .pm = &zforce_pm_ops, 9596f2e6c9bSHeiko Stübner .of_match_table = of_match_ptr(zforce_dt_idtable), 960c6d81bd7SHeiko Stübner }, 961c6d81bd7SHeiko Stübner .probe = zforce_probe, 962c6d81bd7SHeiko Stübner .id_table = zforce_idtable, 963c6d81bd7SHeiko Stübner }; 964c6d81bd7SHeiko Stübner 965c6d81bd7SHeiko Stübner module_i2c_driver(zforce_driver); 966c6d81bd7SHeiko Stübner 967c6d81bd7SHeiko Stübner MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); 968c6d81bd7SHeiko Stübner MODULE_DESCRIPTION("zForce TouchScreen Driver"); 969c6d81bd7SHeiko Stübner MODULE_LICENSE("GPL"); 970