/* * Atmel maXTouch Touchscreen driver * * Copyright (C) 2010 Samsung Electronics Co.Ltd * Copyright (C) 2012 Google, Inc. * * Author: Joonyoung Shim * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * */ #include #include #include #include #include #include #include #include #include #include /* Version */ #define MXT_VER_20 20 #define MXT_VER_21 21 #define MXT_VER_22 22 /* Firmware */ #define MXT_FW_NAME "maxtouch.fw" /* Registers */ #define MXT_INFO 0x00 #define MXT_FAMILY_ID 0x00 #define MXT_VARIANT_ID 0x01 #define MXT_VERSION 0x02 #define MXT_BUILD 0x03 #define MXT_MATRIX_X_SIZE 0x04 #define MXT_MATRIX_Y_SIZE 0x05 #define MXT_OBJECT_NUM 0x06 #define MXT_OBJECT_START 0x07 #define MXT_OBJECT_SIZE 6 /* Object types */ #define MXT_DEBUG_DIAGNOSTIC_T37 37 #define MXT_GEN_MESSAGE_T5 5 #define MXT_GEN_COMMAND_T6 6 #define MXT_GEN_POWER_T7 7 #define MXT_GEN_ACQUIRE_T8 8 #define MXT_GEN_DATASOURCE_T53 53 #define MXT_TOUCH_MULTI_T9 9 #define MXT_TOUCH_KEYARRAY_T15 15 #define MXT_TOUCH_PROXIMITY_T23 23 #define MXT_TOUCH_PROXKEY_T52 52 #define MXT_PROCI_GRIPFACE_T20 20 #define MXT_PROCG_NOISE_T22 22 #define MXT_PROCI_ONETOUCH_T24 24 #define MXT_PROCI_TWOTOUCH_T27 27 #define MXT_PROCI_GRIP_T40 40 #define MXT_PROCI_PALM_T41 41 #define MXT_PROCI_TOUCHSUPPRESSION_T42 42 #define MXT_PROCI_STYLUS_T47 47 #define MXT_PROCG_NOISESUPPRESSION_T48 48 #define MXT_SPT_COMMSCONFIG_T18 18 #define MXT_SPT_GPIOPWM_T19 19 #define MXT_SPT_SELFTEST_T25 25 #define MXT_SPT_CTECONFIG_T28 28 #define MXT_SPT_USERDATA_T38 38 #define MXT_SPT_DIGITIZER_T43 43 #define MXT_SPT_MESSAGECOUNT_T44 44 #define MXT_SPT_CTECONFIG_T46 46 /* MXT_GEN_COMMAND_T6 field */ #define MXT_COMMAND_RESET 0 #define MXT_COMMAND_BACKUPNV 1 #define MXT_COMMAND_CALIBRATE 2 #define MXT_COMMAND_REPORTALL 3 #define MXT_COMMAND_DIAGNOSTIC 5 /* Define for T6 status byte */ #define MXT_T6_STATUS_RESET (1 << 7) /* MXT_GEN_POWER_T7 field */ #define MXT_POWER_IDLEACQINT 0 #define MXT_POWER_ACTVACQINT 1 #define MXT_POWER_ACTV2IDLETO 2 /* MXT_GEN_ACQUIRE_T8 field */ #define MXT_ACQUIRE_CHRGTIME 0 #define MXT_ACQUIRE_TCHDRIFT 2 #define MXT_ACQUIRE_DRIFTST 3 #define MXT_ACQUIRE_TCHAUTOCAL 4 #define MXT_ACQUIRE_SYNC 5 #define MXT_ACQUIRE_ATCHCALST 6 #define MXT_ACQUIRE_ATCHCALSTHR 7 /* MXT_TOUCH_MULTI_T9 field */ #define MXT_TOUCH_CTRL 0 #define MXT_TOUCH_XORIGIN 1 #define MXT_TOUCH_YORIGIN 2 #define MXT_TOUCH_XSIZE 3 #define MXT_TOUCH_YSIZE 4 #define MXT_TOUCH_BLEN 6 #define MXT_TOUCH_TCHTHR 7 #define MXT_TOUCH_TCHDI 8 #define MXT_TOUCH_ORIENT 9 #define MXT_TOUCH_MOVHYSTI 11 #define MXT_TOUCH_MOVHYSTN 12 #define MXT_TOUCH_NUMTOUCH 14 #define MXT_TOUCH_MRGHYST 15 #define MXT_TOUCH_MRGTHR 16 #define MXT_TOUCH_AMPHYST 17 #define MXT_TOUCH_XRANGE_LSB 18 #define MXT_TOUCH_XRANGE_MSB 19 #define MXT_TOUCH_YRANGE_LSB 20 #define MXT_TOUCH_YRANGE_MSB 21 #define MXT_TOUCH_XLOCLIP 22 #define MXT_TOUCH_XHICLIP 23 #define MXT_TOUCH_YLOCLIP 24 #define MXT_TOUCH_YHICLIP 25 #define MXT_TOUCH_XEDGECTRL 26 #define MXT_TOUCH_XEDGEDIST 27 #define MXT_TOUCH_YEDGECTRL 28 #define MXT_TOUCH_YEDGEDIST 29 #define MXT_TOUCH_JUMPLIMIT 30 /* MXT_PROCI_GRIPFACE_T20 field */ #define MXT_GRIPFACE_CTRL 0 #define MXT_GRIPFACE_XLOGRIP 1 #define MXT_GRIPFACE_XHIGRIP 2 #define MXT_GRIPFACE_YLOGRIP 3 #define MXT_GRIPFACE_YHIGRIP 4 #define MXT_GRIPFACE_MAXTCHS 5 #define MXT_GRIPFACE_SZTHR1 7 #define MXT_GRIPFACE_SZTHR2 8 #define MXT_GRIPFACE_SHPTHR1 9 #define MXT_GRIPFACE_SHPTHR2 10 #define MXT_GRIPFACE_SUPEXTTO 11 /* MXT_PROCI_NOISE field */ #define MXT_NOISE_CTRL 0 #define MXT_NOISE_OUTFLEN 1 #define MXT_NOISE_GCAFUL_LSB 3 #define MXT_NOISE_GCAFUL_MSB 4 #define MXT_NOISE_GCAFLL_LSB 5 #define MXT_NOISE_GCAFLL_MSB 6 #define MXT_NOISE_ACTVGCAFVALID 7 #define MXT_NOISE_NOISETHR 8 #define MXT_NOISE_FREQHOPSCALE 10 #define MXT_NOISE_FREQ0 11 #define MXT_NOISE_FREQ1 12 #define MXT_NOISE_FREQ2 13 #define MXT_NOISE_FREQ3 14 #define MXT_NOISE_FREQ4 15 #define MXT_NOISE_IDLEGCAFVALID 16 /* MXT_SPT_COMMSCONFIG_T18 */ #define MXT_COMMS_CTRL 0 #define MXT_COMMS_CMD 1 /* MXT_SPT_CTECONFIG_T28 field */ #define MXT_CTE_CTRL 0 #define MXT_CTE_CMD 1 #define MXT_CTE_MODE 2 #define MXT_CTE_IDLEGCAFDEPTH 3 #define MXT_CTE_ACTVGCAFDEPTH 4 #define MXT_CTE_VOLTAGE 5 #define MXT_VOLTAGE_DEFAULT 2700000 #define MXT_VOLTAGE_STEP 10000 /* Define for MXT_GEN_COMMAND_T6 */ #define MXT_BOOT_VALUE 0xa5 #define MXT_RESET_VALUE 0x01 #define MXT_BACKUP_VALUE 0x55 /* Delay times */ #define MXT_BACKUP_TIME 50 /* msec */ #define MXT_RESET_TIME 200 /* msec */ #define MXT_RESET_TIMEOUT 3000 /* msec */ #define MXT_CRC_TIMEOUT 1000 /* msec */ #define MXT_FW_RESET_TIME 3000 /* msec */ #define MXT_FW_CHG_TIMEOUT 300 /* msec */ /* Command to unlock bootloader */ #define MXT_UNLOCK_CMD_MSB 0xaa #define MXT_UNLOCK_CMD_LSB 0xdc /* Bootloader mode status */ #define MXT_WAITING_BOOTLOAD_CMD 0xc0 /* valid 7 6 bit only */ #define MXT_WAITING_FRAME_DATA 0x80 /* valid 7 6 bit only */ #define MXT_FRAME_CRC_CHECK 0x02 #define MXT_FRAME_CRC_FAIL 0x03 #define MXT_FRAME_CRC_PASS 0x04 #define MXT_APP_CRC_FAIL 0x40 /* valid 7 8 bit only */ #define MXT_BOOT_STATUS_MASK 0x3f #define MXT_BOOT_EXTENDED_ID (1 << 5) #define MXT_BOOT_ID_MASK 0x1f /* Touch status */ #define MXT_UNGRIP (1 << 0) #define MXT_SUPPRESS (1 << 1) #define MXT_AMP (1 << 2) #define MXT_VECTOR (1 << 3) #define MXT_MOVE (1 << 4) #define MXT_RELEASE (1 << 5) #define MXT_PRESS (1 << 6) #define MXT_DETECT (1 << 7) /* Touch orient bits */ #define MXT_XY_SWITCH (1 << 0) #define MXT_X_INVERT (1 << 1) #define MXT_Y_INVERT (1 << 2) /* Touchscreen absolute values */ #define MXT_MAX_AREA 0xff #define MXT_PIXELS_PER_MM 20 struct mxt_info { u8 family_id; u8 variant_id; u8 version; u8 build; u8 matrix_xsize; u8 matrix_ysize; u8 object_num; }; struct mxt_object { u8 type; u16 start_address; u8 size_minus_one; u8 instances_minus_one; u8 num_report_ids; } __packed; struct mxt_message { u8 reportid; u8 message[7]; }; /* Each client has this additional data */ struct mxt_data { struct i2c_client *client; struct input_dev *input_dev; char phys[64]; /* device physical location */ const struct mxt_platform_data *pdata; struct mxt_object *object_table; struct mxt_info info; unsigned int irq; unsigned int max_x; unsigned int max_y; bool in_bootloader; u32 config_crc; u8 bootloader_addr; /* Cached parameters from object table */ u8 T6_reportid; u16 T6_address; u8 T9_reportid_min; u8 T9_reportid_max; u8 T19_reportid; /* for fw update in bootloader */ struct completion bl_completion; /* for reset handling */ struct completion reset_completion; /* for config update handling */ struct completion crc_completion; }; static size_t mxt_obj_size(const struct mxt_object *obj) { return obj->size_minus_one + 1; } static size_t mxt_obj_instances(const struct mxt_object *obj) { return obj->instances_minus_one + 1; } static bool mxt_object_readable(unsigned int type) { switch (type) { case MXT_GEN_COMMAND_T6: case MXT_GEN_POWER_T7: case MXT_GEN_ACQUIRE_T8: case MXT_GEN_DATASOURCE_T53: case MXT_TOUCH_MULTI_T9: case MXT_TOUCH_KEYARRAY_T15: case MXT_TOUCH_PROXIMITY_T23: case MXT_TOUCH_PROXKEY_T52: case MXT_PROCI_GRIPFACE_T20: case MXT_PROCG_NOISE_T22: case MXT_PROCI_ONETOUCH_T24: case MXT_PROCI_TWOTOUCH_T27: case MXT_PROCI_GRIP_T40: case MXT_PROCI_PALM_T41: case MXT_PROCI_TOUCHSUPPRESSION_T42: case MXT_PROCI_STYLUS_T47: case MXT_PROCG_NOISESUPPRESSION_T48: case MXT_SPT_COMMSCONFIG_T18: case MXT_SPT_GPIOPWM_T19: case MXT_SPT_SELFTEST_T25: case MXT_SPT_CTECONFIG_T28: case MXT_SPT_USERDATA_T38: case MXT_SPT_DIGITIZER_T43: case MXT_SPT_CTECONFIG_T46: return true; default: return false; } } static bool mxt_object_writable(unsigned int type) { switch (type) { case MXT_GEN_COMMAND_T6: case MXT_GEN_POWER_T7: case MXT_GEN_ACQUIRE_T8: case MXT_TOUCH_MULTI_T9: case MXT_TOUCH_KEYARRAY_T15: case MXT_TOUCH_PROXIMITY_T23: case MXT_TOUCH_PROXKEY_T52: case MXT_PROCI_GRIPFACE_T20: case MXT_PROCG_NOISE_T22: case MXT_PROCI_ONETOUCH_T24: case MXT_PROCI_TWOTOUCH_T27: case MXT_PROCI_GRIP_T40: case MXT_PROCI_PALM_T41: case MXT_PROCI_TOUCHSUPPRESSION_T42: case MXT_PROCI_STYLUS_T47: case MXT_PROCG_NOISESUPPRESSION_T48: case MXT_SPT_COMMSCONFIG_T18: case MXT_SPT_GPIOPWM_T19: case MXT_SPT_SELFTEST_T25: case MXT_SPT_CTECONFIG_T28: case MXT_SPT_DIGITIZER_T43: case MXT_SPT_CTECONFIG_T46: return true; default: return false; } } static void mxt_dump_message(struct device *dev, struct mxt_message *message) { dev_dbg(dev, "reportid: %u\tmessage: %*ph\n", message->reportid, 7, message->message); } static int mxt_wait_for_completion(struct mxt_data *data, struct completion *comp, unsigned int timeout_ms) { struct device *dev = &data->client->dev; unsigned long timeout = msecs_to_jiffies(timeout_ms); long ret; ret = wait_for_completion_interruptible_timeout(comp, timeout); if (ret < 0) { return ret; } else if (ret == 0) { dev_err(dev, "Wait for completion timed out.\n"); return -ETIMEDOUT; } return 0; } static int mxt_bootloader_read(struct mxt_data *data, u8 *val, unsigned int count) { int ret; struct i2c_msg msg; msg.addr = data->bootloader_addr; msg.flags = data->client->flags & I2C_M_TEN; msg.flags |= I2C_M_RD; msg.len = count; msg.buf = val; ret = i2c_transfer(data->client->adapter, &msg, 1); if (ret == 1) { ret = 0; } else { ret = ret < 0 ? ret : -EIO; dev_err(&data->client->dev, "%s: i2c recv failed (%d)\n", __func__, ret); } return ret; } static int mxt_bootloader_write(struct mxt_data *data, const u8 * const val, unsigned int count) { int ret; struct i2c_msg msg; msg.addr = data->bootloader_addr; msg.flags = data->client->flags & I2C_M_TEN; msg.len = count; msg.buf = (u8 *)val; ret = i2c_transfer(data->client->adapter, &msg, 1); if (ret == 1) { ret = 0; } else { ret = ret < 0 ? ret : -EIO; dev_err(&data->client->dev, "%s: i2c send failed (%d)\n", __func__, ret); } return ret; } static int mxt_lookup_bootloader_address(struct mxt_data *data) { u8 appmode = data->client->addr; u8 bootloader; switch (appmode) { case 0x4a: case 0x4b: case 0x4c: case 0x4d: case 0x5a: case 0x5b: bootloader = appmode - 0x26; break; default: dev_err(&data->client->dev, "Appmode i2c address 0x%02x not found\n", appmode); return -EINVAL; } data->bootloader_addr = bootloader; return 0; } static u8 mxt_get_bootloader_version(struct mxt_data *data, u8 val) { struct device *dev = &data->client->dev; u8 buf[3]; if (val & MXT_BOOT_EXTENDED_ID) { if (mxt_bootloader_read(data, &buf[0], 3) != 0) { dev_err(dev, "%s: i2c failure\n", __func__); return -EIO; } dev_dbg(dev, "Bootloader ID:%d Version:%d\n", buf[1], buf[2]); return buf[0]; } else { dev_dbg(dev, "Bootloader ID:%d\n", val & MXT_BOOT_ID_MASK); return val; } } static int mxt_check_bootloader(struct mxt_data *data, unsigned int state) { struct device *dev = &data->client->dev; u8 val; int ret; recheck: if (state != MXT_WAITING_BOOTLOAD_CMD) { /* * In application update mode, the interrupt * line signals state transitions. We must wait for the * CHG assertion before reading the status byte. * Once the status byte has been read, the line is deasserted. */ ret = mxt_wait_for_completion(data, &data->bl_completion, MXT_FW_CHG_TIMEOUT); if (ret) { /* * TODO: handle -ERESTARTSYS better by terminating * fw update process before returning to userspace * by writing length 0x000 to device (iff we are in * WAITING_FRAME_DATA state). */ dev_err(dev, "Update wait error %d\n", ret); return ret; } } ret = mxt_bootloader_read(data, &val, 1); if (ret) return ret; if (state == MXT_WAITING_BOOTLOAD_CMD) val = mxt_get_bootloader_version(data, val); switch (state) { case MXT_WAITING_BOOTLOAD_CMD: case MXT_WAITING_FRAME_DATA: val &= ~MXT_BOOT_STATUS_MASK; break; case MXT_FRAME_CRC_PASS: if (val == MXT_FRAME_CRC_CHECK) { goto recheck; } else if (val == MXT_FRAME_CRC_FAIL) { dev_err(dev, "Bootloader CRC fail\n"); return -EINVAL; } break; default: return -EINVAL; } if (val != state) { dev_err(dev, "Invalid bootloader state %02X != %02X\n", val, state); return -EINVAL; } return 0; } static int mxt_unlock_bootloader(struct mxt_data *data) { int ret; u8 buf[2]; buf[0] = MXT_UNLOCK_CMD_LSB; buf[1] = MXT_UNLOCK_CMD_MSB; ret = mxt_bootloader_write(data, buf, 2); if (ret) return ret; return 0; } static int __mxt_read_reg(struct i2c_client *client, u16 reg, u16 len, void *val) { struct i2c_msg xfer[2]; u8 buf[2]; int ret; buf[0] = reg & 0xff; buf[1] = (reg >> 8) & 0xff; /* Write register */ xfer[0].addr = client->addr; xfer[0].flags = 0; xfer[0].len = 2; xfer[0].buf = buf; /* Read data */ xfer[1].addr = client->addr; xfer[1].flags = I2C_M_RD; xfer[1].len = len; xfer[1].buf = val; ret = i2c_transfer(client->adapter, xfer, 2); if (ret == 2) { ret = 0; } else { if (ret >= 0) ret = -EIO; dev_err(&client->dev, "%s: i2c transfer failed (%d)\n", __func__, ret); } return ret; } static int mxt_read_reg(struct i2c_client *client, u16 reg, u8 *val) { return __mxt_read_reg(client, reg, 1, val); } static int __mxt_write_reg(struct i2c_client *client, u16 reg, u16 len, const void *val) { u8 *buf; size_t count; int ret; count = len + 2; buf = kmalloc(count, GFP_KERNEL); if (!buf) return -ENOMEM; buf[0] = reg & 0xff; buf[1] = (reg >> 8) & 0xff; memcpy(&buf[2], val, len); ret = i2c_master_send(client, buf, count); if (ret == count) { ret = 0; } else { if (ret >= 0) ret = -EIO; dev_err(&client->dev, "%s: i2c send failed (%d)\n", __func__, ret); } kfree(buf); return ret; } static int mxt_write_reg(struct i2c_client *client, u16 reg, u8 val) { return __mxt_write_reg(client, reg, 1, &val); } static struct mxt_object * mxt_get_object(struct mxt_data *data, u8 type) { struct mxt_object *object; int i; for (i = 0; i < data->info.object_num; i++) { object = data->object_table + i; if (object->type == type) return object; } dev_err(&data->client->dev, "Invalid object type T%u\n", type); return NULL; } static int mxt_read_message(struct mxt_data *data, struct mxt_message *message) { struct mxt_object *object; u16 reg; object = mxt_get_object(data, MXT_GEN_MESSAGE_T5); if (!object) return -EINVAL; reg = object->start_address; return __mxt_read_reg(data->client, reg, sizeof(struct mxt_message), message); } static int mxt_write_object(struct mxt_data *data, u8 type, u8 offset, u8 val) { struct mxt_object *object; u16 reg; object = mxt_get_object(data, type); if (!object || offset >= mxt_obj_size(object)) return -EINVAL; reg = object->start_address; return mxt_write_reg(data->client, reg + offset, val); } static void mxt_input_button(struct mxt_data *data, struct mxt_message *message) { struct input_dev *input = data->input_dev; const struct mxt_platform_data *pdata = data->pdata; bool button; int i; /* Active-low switch */ for (i = 0; i < pdata->t19_num_keys; i++) { if (pdata->t19_keymap[i] == KEY_RESERVED) continue; button = !(message->message[0] & (1 << i)); input_report_key(input, pdata->t19_keymap[i], button); } } static void mxt_input_touchevent(struct mxt_data *data, struct mxt_message *message, int id) { struct device *dev = &data->client->dev; u8 status = message->message[0]; struct input_dev *input_dev = data->input_dev; int x; int y; int area; int pressure; x = (message->message[1] << 4) | ((message->message[3] >> 4) & 0xf); y = (message->message[2] << 4) | ((message->message[3] & 0xf)); if (data->max_x < 1024) x = x >> 2; if (data->max_y < 1024) y = y >> 2; area = message->message[4]; pressure = message->message[5]; dev_dbg(dev, "[%u] %c%c%c%c%c%c%c%c x: %5u y: %5u area: %3u amp: %3u\n", id, (status & MXT_DETECT) ? 'D' : '.', (status & MXT_PRESS) ? 'P' : '.', (status & MXT_RELEASE) ? 'R' : '.', (status & MXT_MOVE) ? 'M' : '.', (status & MXT_VECTOR) ? 'V' : '.', (status & MXT_AMP) ? 'A' : '.', (status & MXT_SUPPRESS) ? 'S' : '.', (status & MXT_UNGRIP) ? 'U' : '.', x, y, area, pressure); input_mt_slot(input_dev, id); input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, status & MXT_DETECT); if (status & MXT_DETECT) { input_report_abs(input_dev, ABS_MT_POSITION_X, x); input_report_abs(input_dev, ABS_MT_POSITION_Y, y); input_report_abs(input_dev, ABS_MT_PRESSURE, pressure); input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, area); } } static u16 mxt_extract_T6_csum(const u8 *csum) { return csum[0] | (csum[1] << 8) | (csum[2] << 16); } static bool mxt_is_T9_message(struct mxt_data *data, struct mxt_message *msg) { u8 id = msg->reportid; return (id >= data->T9_reportid_min && id <= data->T9_reportid_max); } static irqreturn_t mxt_process_messages_until_invalid(struct mxt_data *data) { struct mxt_message message; const u8 *payload = &message.message[0]; struct device *dev = &data->client->dev; u8 reportid; bool update_input = false; u32 crc; do { if (mxt_read_message(data, &message)) { dev_err(dev, "Failed to read message\n"); return IRQ_NONE; } reportid = message.reportid; if (reportid == data->T6_reportid) { u8 status = payload[0]; crc = mxt_extract_T6_csum(&payload[1]); if (crc != data->config_crc) { data->config_crc = crc; complete(&data->crc_completion); } dev_dbg(dev, "Status: %02x Config Checksum: %06x\n", status, data->config_crc); if (status & MXT_T6_STATUS_RESET) complete(&data->reset_completion); } else if (mxt_is_T9_message(data, &message)) { int id = reportid - data->T9_reportid_min; mxt_input_touchevent(data, &message, id); update_input = true; } else if (message.reportid == data->T19_reportid) { mxt_input_button(data, &message); update_input = true; } else { mxt_dump_message(dev, &message); } } while (reportid != 0xff); if (update_input) { input_mt_report_pointer_emulation(data->input_dev, false); input_sync(data->input_dev); } return IRQ_HANDLED; } static irqreturn_t mxt_interrupt(int irq, void *dev_id) { struct mxt_data *data = dev_id; if (data->in_bootloader) { /* bootloader state transition completion */ complete(&data->bl_completion); return IRQ_HANDLED; } return mxt_process_messages_until_invalid(data); } static int mxt_t6_command(struct mxt_data *data, u16 cmd_offset, u8 value, bool wait) { u16 reg; u8 command_register; int timeout_counter = 0; int ret; reg = data->T6_address + cmd_offset; ret = mxt_write_reg(data->client, reg, value); if (ret) return ret; if (!wait) return 0; do { msleep(20); ret = __mxt_read_reg(data->client, reg, 1, &command_register); if (ret) return ret; } while (command_register != 0 && timeout_counter++ <= 100); if (timeout_counter > 100) { dev_err(&data->client->dev, "Command failed!\n"); return -EIO; } return 0; } static int mxt_soft_reset(struct mxt_data *data) { struct device *dev = &data->client->dev; int ret = 0; dev_info(dev, "Resetting chip\n"); reinit_completion(&data->reset_completion); ret = mxt_t6_command(data, MXT_COMMAND_RESET, MXT_RESET_VALUE, false); if (ret) return ret; ret = mxt_wait_for_completion(data, &data->reset_completion, MXT_RESET_TIMEOUT); if (ret) return ret; return 0; } static void mxt_update_crc(struct mxt_data *data, u8 cmd, u8 value) { /* * On failure, CRC is set to 0 and config will always be * downloaded. */ data->config_crc = 0; reinit_completion(&data->crc_completion); mxt_t6_command(data, cmd, value, true); /* * Wait for crc message. On failure, CRC is set to 0 and config will * always be downloaded. */ mxt_wait_for_completion(data, &data->crc_completion, MXT_CRC_TIMEOUT); } static int mxt_check_reg_init(struct mxt_data *data) { const struct mxt_platform_data *pdata = data->pdata; struct mxt_object *object; struct device *dev = &data->client->dev; int index = 0; int i, size; int ret; if (!pdata->config) { dev_dbg(dev, "No cfg data defined, skipping reg init\n"); return 0; } mxt_update_crc(data, MXT_COMMAND_REPORTALL, 1); if (data->config_crc == pdata->config_crc) { dev_info(dev, "Config CRC 0x%06X: OK\n", data->config_crc); return 0; } dev_info(dev, "Config CRC 0x%06X: does not match 0x%06X\n", data->config_crc, pdata->config_crc); for (i = 0; i < data->info.object_num; i++) { object = data->object_table + i; if (!mxt_object_writable(object->type)) continue; size = mxt_obj_size(object) * mxt_obj_instances(object); if (index + size > pdata->config_length) { dev_err(dev, "Not enough config data!\n"); return -EINVAL; } ret = __mxt_write_reg(data->client, object->start_address, size, &pdata->config[index]); if (ret) return ret; index += size; } mxt_update_crc(data, MXT_COMMAND_BACKUPNV, MXT_BACKUP_VALUE); ret = mxt_soft_reset(data); if (ret) return ret; dev_info(dev, "Config successfully updated\n"); return 0; } static int mxt_make_highchg(struct mxt_data *data) { struct device *dev = &data->client->dev; struct mxt_message message; int count = 10; int error; /* Read dummy message to make high CHG pin */ do { error = mxt_read_message(data, &message); if (error) return error; } while (message.reportid != 0xff && --count); if (!count) { dev_err(dev, "CHG pin isn't cleared\n"); return -EBUSY; } return 0; } static int mxt_get_info(struct mxt_data *data) { struct i2c_client *client = data->client; struct mxt_info *info = &data->info; int error; /* Read 7-byte info block starting at address 0 */ error = __mxt_read_reg(client, MXT_INFO, sizeof(*info), info); if (error) return error; return 0; } static int mxt_get_object_table(struct mxt_data *data) { struct i2c_client *client = data->client; size_t table_size; int error; int i; u8 reportid; table_size = data->info.object_num * sizeof(struct mxt_object); error = __mxt_read_reg(client, MXT_OBJECT_START, table_size, data->object_table); if (error) return error; /* Valid Report IDs start counting from 1 */ reportid = 1; for (i = 0; i < data->info.object_num; i++) { struct mxt_object *object = data->object_table + i; u8 min_id, max_id; le16_to_cpus(&object->start_address); if (object->num_report_ids) { min_id = reportid; reportid += object->num_report_ids * mxt_obj_instances(object); max_id = reportid - 1; } else { min_id = 0; max_id = 0; } dev_dbg(&data->client->dev, "T%u Start:%u Size:%zu Instances:%zu Report IDs:%u-%u\n", object->type, object->start_address, mxt_obj_size(object), mxt_obj_instances(object), min_id, max_id); switch (object->type) { case MXT_GEN_COMMAND_T6: data->T6_reportid = min_id; data->T6_address = object->start_address; break; case MXT_TOUCH_MULTI_T9: data->T9_reportid_min = min_id; data->T9_reportid_max = max_id; break; case MXT_SPT_GPIOPWM_T19: data->T19_reportid = min_id; break; } } return 0; } static void mxt_free_object_table(struct mxt_data *data) { kfree(data->object_table); data->object_table = NULL; data->T6_reportid = 0; data->T9_reportid_min = 0; data->T9_reportid_max = 0; data->T19_reportid = 0; } static int mxt_initialize(struct mxt_data *data) { struct i2c_client *client = data->client; struct mxt_info *info = &data->info; int error; u8 val; error = mxt_get_info(data); if (error) return error; data->object_table = kcalloc(info->object_num, sizeof(struct mxt_object), GFP_KERNEL); if (!data->object_table) { dev_err(&client->dev, "Failed to allocate memory\n"); return -ENOMEM; } /* Get object table information */ error = mxt_get_object_table(data); if (error) { dev_err(&client->dev, "Error %d reading object table\n", error); goto err_free_object_table; } /* Check register init values */ error = mxt_check_reg_init(data); if (error) { dev_err(&client->dev, "Error %d initializing configuration\n", error); goto err_free_object_table; } /* Update matrix size at info struct */ error = mxt_read_reg(client, MXT_MATRIX_X_SIZE, &val); if (error) goto err_free_object_table; info->matrix_xsize = val; error = mxt_read_reg(client, MXT_MATRIX_Y_SIZE, &val); if (error) goto err_free_object_table; info->matrix_ysize = val; dev_info(&client->dev, "Family: %u Variant: %u Firmware V%u.%u.%02X\n", info->family_id, info->variant_id, info->version >> 4, info->version & 0xf, info->build); dev_info(&client->dev, "Matrix X Size: %u Matrix Y Size: %u Objects: %u\n", info->matrix_xsize, info->matrix_ysize, info->object_num); return 0; err_free_object_table: mxt_free_object_table(data); return error; } static void mxt_calc_resolution(struct mxt_data *data) { unsigned int max_x = data->pdata->x_size - 1; unsigned int max_y = data->pdata->y_size - 1; if (data->pdata->orient & MXT_XY_SWITCH) { data->max_x = max_y; data->max_y = max_x; } else { data->max_x = max_x; data->max_y = max_y; } } /* Firmware Version is returned as Major.Minor.Build */ static ssize_t mxt_fw_version_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mxt_data *data = dev_get_drvdata(dev); struct mxt_info *info = &data->info; return scnprintf(buf, PAGE_SIZE, "%u.%u.%02X\n", info->version >> 4, info->version & 0xf, info->build); } /* Hardware Version is returned as FamilyID.VariantID */ static ssize_t mxt_hw_version_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mxt_data *data = dev_get_drvdata(dev); struct mxt_info *info = &data->info; return scnprintf(buf, PAGE_SIZE, "%u.%u\n", info->family_id, info->variant_id); } static ssize_t mxt_show_instance(char *buf, int count, struct mxt_object *object, int instance, const u8 *val) { int i; if (mxt_obj_instances(object) > 1) count += scnprintf(buf + count, PAGE_SIZE - count, "Instance %u\n", instance); for (i = 0; i < mxt_obj_size(object); i++) count += scnprintf(buf + count, PAGE_SIZE - count, "\t[%2u]: %02x (%d)\n", i, val[i], val[i]); count += scnprintf(buf + count, PAGE_SIZE - count, "\n"); return count; } static ssize_t mxt_object_show(struct device *dev, struct device_attribute *attr, char *buf) { struct mxt_data *data = dev_get_drvdata(dev); struct mxt_object *object; int count = 0; int i, j; int error; u8 *obuf; /* Pre-allocate buffer large enough to hold max sized object. */ obuf = kmalloc(256, GFP_KERNEL); if (!obuf) return -ENOMEM; error = 0; for (i = 0; i < data->info.object_num; i++) { object = data->object_table + i; if (!mxt_object_readable(object->type)) continue; count += scnprintf(buf + count, PAGE_SIZE - count, "T%u:\n", object->type); for (j = 0; j < mxt_obj_instances(object); j++) { u16 size = mxt_obj_size(object); u16 addr = object->start_address + j * size; error = __mxt_read_reg(data->client, addr, size, obuf); if (error) goto done; count = mxt_show_instance(buf, count, object, j, obuf); } } done: kfree(obuf); return error ?: count; } static int mxt_load_fw(struct device *dev, const char *fn) { struct mxt_data *data = dev_get_drvdata(dev); const struct firmware *fw = NULL; unsigned int frame_size; unsigned int pos = 0; unsigned int retry = 0; int ret; ret = request_firmware(&fw, fn, dev); if (ret) { dev_err(dev, "Unable to open firmware %s\n", fn); return ret; } ret = mxt_lookup_bootloader_address(data); if (ret) goto release_firmware; /* Change to the bootloader mode */ data->in_bootloader = true; ret = mxt_t6_command(data, MXT_COMMAND_RESET, MXT_BOOT_VALUE, false); if (ret) goto release_firmware; msleep(MXT_RESET_TIME); reinit_completion(&data->bl_completion); ret = mxt_check_bootloader(data, MXT_WAITING_BOOTLOAD_CMD); if (ret) goto disable_irq; /* Unlock bootloader */ mxt_unlock_bootloader(data); while (pos < fw->size) { ret = mxt_check_bootloader(data, MXT_WAITING_FRAME_DATA); if (ret) goto disable_irq; frame_size = ((*(fw->data + pos) << 8) | *(fw->data + pos + 1)); /* Take account of CRC bytes */ frame_size += 2; /* Write one frame to device */ ret = mxt_bootloader_write(data, fw->data + pos, frame_size); if (ret) goto disable_irq; ret = mxt_check_bootloader(data, MXT_FRAME_CRC_PASS); if (ret) { retry++; /* Back off by 20ms per retry */ msleep(retry * 20); if (retry > 20) { dev_err(dev, "Retry count exceeded\n"); goto disable_irq; } } else { retry = 0; pos += frame_size; } dev_dbg(dev, "Updated %d bytes / %zd bytes\n", pos, fw->size); } /* Wait for flash. */ ret = mxt_wait_for_completion(data, &data->bl_completion, MXT_FW_RESET_TIME); if (ret) goto disable_irq; /* * Wait for device to reset. Some bootloader versions do not assert * the CHG line after bootloading has finished, so ignore potential * errors. */ mxt_wait_for_completion(data, &data->bl_completion, MXT_FW_RESET_TIME); data->in_bootloader = false; disable_irq: disable_irq(data->irq); release_firmware: release_firmware(fw); return ret; } static ssize_t mxt_update_fw_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct mxt_data *data = dev_get_drvdata(dev); int error; error = mxt_load_fw(dev, MXT_FW_NAME); if (error) { dev_err(dev, "The firmware update failed(%d)\n", error); count = error; } else { dev_info(dev, "The firmware update succeeded\n"); mxt_free_object_table(data); mxt_initialize(data); enable_irq(data->irq); error = mxt_make_highchg(data); if (error) return error; } return count; } static DEVICE_ATTR(fw_version, S_IRUGO, mxt_fw_version_show, NULL); static DEVICE_ATTR(hw_version, S_IRUGO, mxt_hw_version_show, NULL); static DEVICE_ATTR(object, S_IRUGO, mxt_object_show, NULL); static DEVICE_ATTR(update_fw, S_IWUSR, NULL, mxt_update_fw_store); static struct attribute *mxt_attrs[] = { &dev_attr_fw_version.attr, &dev_attr_hw_version.attr, &dev_attr_object.attr, &dev_attr_update_fw.attr, NULL }; static const struct attribute_group mxt_attr_group = { .attrs = mxt_attrs, }; static void mxt_start(struct mxt_data *data) { /* Touch enable */ mxt_write_object(data, MXT_TOUCH_MULTI_T9, MXT_TOUCH_CTRL, 0x83); } static void mxt_stop(struct mxt_data *data) { /* Touch disable */ mxt_write_object(data, MXT_TOUCH_MULTI_T9, MXT_TOUCH_CTRL, 0); } static int mxt_input_open(struct input_dev *dev) { struct mxt_data *data = input_get_drvdata(dev); mxt_start(data); return 0; } static void mxt_input_close(struct input_dev *dev) { struct mxt_data *data = input_get_drvdata(dev); mxt_stop(data); } static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) { const struct mxt_platform_data *pdata = dev_get_platdata(&client->dev); struct mxt_data *data; struct input_dev *input_dev; int error; unsigned int num_mt_slots; unsigned int mt_flags = 0; int i; if (!pdata) return -EINVAL; data = kzalloc(sizeof(struct mxt_data), GFP_KERNEL); input_dev = input_allocate_device(); if (!data || !input_dev) { dev_err(&client->dev, "Failed to allocate memory\n"); error = -ENOMEM; goto err_free_mem; } input_dev->name = "Atmel maXTouch Touchscreen"; snprintf(data->phys, sizeof(data->phys), "i2c-%u-%04x/input0", client->adapter->nr, client->addr); input_dev->phys = data->phys; input_dev->id.bustype = BUS_I2C; input_dev->dev.parent = &client->dev; input_dev->open = mxt_input_open; input_dev->close = mxt_input_close; data->client = client; data->input_dev = input_dev; data->pdata = pdata; data->irq = client->irq; init_completion(&data->bl_completion); init_completion(&data->reset_completion); init_completion(&data->crc_completion); mxt_calc_resolution(data); error = mxt_initialize(data); if (error) goto err_free_mem; __set_bit(EV_ABS, input_dev->evbit); __set_bit(EV_KEY, input_dev->evbit); __set_bit(BTN_TOUCH, input_dev->keybit); if (pdata->t19_num_keys) { __set_bit(INPUT_PROP_BUTTONPAD, input_dev->propbit); for (i = 0; i < pdata->t19_num_keys; i++) if (pdata->t19_keymap[i] != KEY_RESERVED) input_set_capability(input_dev, EV_KEY, pdata->t19_keymap[i]); mt_flags |= INPUT_MT_POINTER; input_abs_set_res(input_dev, ABS_X, MXT_PIXELS_PER_MM); input_abs_set_res(input_dev, ABS_Y, MXT_PIXELS_PER_MM); input_abs_set_res(input_dev, ABS_MT_POSITION_X, MXT_PIXELS_PER_MM); input_abs_set_res(input_dev, ABS_MT_POSITION_Y, MXT_PIXELS_PER_MM); input_dev->name = "Atmel maXTouch Touchpad"; } /* For single touch */ input_set_abs_params(input_dev, ABS_X, 0, data->max_x, 0, 0); input_set_abs_params(input_dev, ABS_Y, 0, data->max_y, 0, 0); input_set_abs_params(input_dev, ABS_PRESSURE, 0, 255, 0, 0); /* For multi touch */ num_mt_slots = data->T9_reportid_max - data->T9_reportid_min + 1; error = input_mt_init_slots(input_dev, num_mt_slots, mt_flags); if (error) goto err_free_object; input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, MXT_MAX_AREA, 0, 0); input_set_abs_params(input_dev, ABS_MT_POSITION_X, 0, data->max_x, 0, 0); input_set_abs_params(input_dev, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0); input_set_abs_params(input_dev, ABS_MT_PRESSURE, 0, 255, 0, 0); input_set_drvdata(input_dev, data); i2c_set_clientdata(client, data); error = request_threaded_irq(client->irq, NULL, mxt_interrupt, pdata->irqflags | IRQF_ONESHOT, client->name, data); if (error) { dev_err(&client->dev, "Failed to register interrupt\n"); goto err_free_object; } error = mxt_make_highchg(data); if (error) goto err_free_irq; error = input_register_device(input_dev); if (error) { dev_err(&client->dev, "Error %d registering input device\n", error); goto err_free_irq; } error = sysfs_create_group(&client->dev.kobj, &mxt_attr_group); if (error) { dev_err(&client->dev, "Failure %d creating sysfs group\n", error); goto err_unregister_device; } return 0; err_unregister_device: input_unregister_device(input_dev); input_dev = NULL; err_free_irq: free_irq(client->irq, data); err_free_object: kfree(data->object_table); err_free_mem: input_free_device(input_dev); kfree(data); return error; } static int mxt_remove(struct i2c_client *client) { struct mxt_data *data = i2c_get_clientdata(client); sysfs_remove_group(&client->dev.kobj, &mxt_attr_group); free_irq(data->irq, data); input_unregister_device(data->input_dev); kfree(data->object_table); kfree(data); return 0; } #ifdef CONFIG_PM_SLEEP static int mxt_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct mxt_data *data = i2c_get_clientdata(client); struct input_dev *input_dev = data->input_dev; mutex_lock(&input_dev->mutex); if (input_dev->users) mxt_stop(data); mutex_unlock(&input_dev->mutex); return 0; } static int mxt_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct mxt_data *data = i2c_get_clientdata(client); struct input_dev *input_dev = data->input_dev; mxt_soft_reset(data); mutex_lock(&input_dev->mutex); if (input_dev->users) mxt_start(data); mutex_unlock(&input_dev->mutex); return 0; } #endif static SIMPLE_DEV_PM_OPS(mxt_pm_ops, mxt_suspend, mxt_resume); static const struct i2c_device_id mxt_id[] = { { "qt602240_ts", 0 }, { "atmel_mxt_ts", 0 }, { "atmel_mxt_tp", 0 }, { "mXT224", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, mxt_id); static struct i2c_driver mxt_driver = { .driver = { .name = "atmel_mxt_ts", .owner = THIS_MODULE, .pm = &mxt_pm_ops, }, .probe = mxt_probe, .remove = mxt_remove, .id_table = mxt_id, }; module_i2c_driver(mxt_driver); /* Module information */ MODULE_AUTHOR("Joonyoung Shim "); MODULE_DESCRIPTION("Atmel maXTouch Touchscreen driver"); MODULE_LICENSE("GPL");