/* * Atmel maXTouch Touchscreen driver * * Copyright (C) 2010 Samsung Electronics Co.Ltd * 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 /* Version */ #define MXT_VER_20 20 #define MXT_VER_21 21 #define MXT_VER_22 22 /* Slave addresses */ #define MXT_APP_LOW 0x4a #define MXT_APP_HIGH 0x4b #define MXT_BOOT_LOW 0x24 #define MXT_BOOT_HIGH 0x25 /* Firmware */ #define MXT_FW_NAME "maxtouch.fw" /* Registers */ #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 /* 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_BACKUP_VALUE 0x55 #define MXT_BACKUP_TIME 25 /* msec */ #define MXT_RESET_TIME 65 /* msec */ #define MXT_FWRESET_TIME 175 /* 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 /* Touch status */ #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_MAX_FINGER 10 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; u8 instances; u8 num_report_ids; /* to map object and message */ u8 max_reportid; }; struct mxt_message { u8 reportid; u8 message[7]; u8 checksum; }; struct mxt_finger { int status; int x; int y; int area; int pressure; }; /* Each client has this additional data */ struct mxt_data { struct i2c_client *client; struct input_dev *input_dev; const struct mxt_platform_data *pdata; struct mxt_object *object_table; struct mxt_info info; struct mxt_finger finger[MXT_MAX_FINGER]; unsigned int irq; unsigned int max_x; unsigned int max_y; }; static bool mxt_object_readable(unsigned int type) { switch (type) { case MXT_GEN_MESSAGE_T5: 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:\t0x%x\n", message->reportid); dev_dbg(dev, "message1:\t0x%x\n", message->message[0]); dev_dbg(dev, "message2:\t0x%x\n", message->message[1]); dev_dbg(dev, "message3:\t0x%x\n", message->message[2]); dev_dbg(dev, "message4:\t0x%x\n", message->message[3]); dev_dbg(dev, "message5:\t0x%x\n", message->message[4]); dev_dbg(dev, "message6:\t0x%x\n", message->message[5]); dev_dbg(dev, "message7:\t0x%x\n", message->message[6]); dev_dbg(dev, "checksum:\t0x%x\n", message->checksum); } static int mxt_check_bootloader(struct i2c_client *client, unsigned int state) { u8 val; recheck: if (i2c_master_recv(client, &val, 1) != 1) { dev_err(&client->dev, "%s: i2c recv failed\n", __func__); return -EIO; } 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; break; default: return -EINVAL; } if (val != state) { dev_err(&client->dev, "Unvalid bootloader mode state\n"); return -EINVAL; } return 0; } static int mxt_unlock_bootloader(struct i2c_client *client) { u8 buf[2]; buf[0] = MXT_UNLOCK_CMD_LSB; buf[1] = MXT_UNLOCK_CMD_MSB; if (i2c_master_send(client, buf, 2) != 2) { dev_err(&client->dev, "%s: i2c send failed\n", __func__); return -EIO; } return 0; } static int mxt_fw_write(struct i2c_client *client, const u8 *data, unsigned int frame_size) { if (i2c_master_send(client, data, frame_size) != frame_size) { dev_err(&client->dev, "%s: i2c send failed\n", __func__); return -EIO; } 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]; 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; if (i2c_transfer(client->adapter, xfer, 2) != 2) { dev_err(&client->dev, "%s: i2c transfer failed\n", __func__); return -EIO; } return 0; } 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, u8 val) { u8 buf[3]; buf[0] = reg & 0xff; buf[1] = (reg >> 8) & 0xff; buf[2] = val; if (i2c_master_send(client, buf, 3) != 3) { dev_err(&client->dev, "%s: i2c send failed\n", __func__); return -EIO; } return 0; } static int mxt_read_object_table(struct i2c_client *client, u16 reg, u8 *object_buf) { return __mxt_read_reg(client, reg, MXT_OBJECT_SIZE, object_buf); } 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\n"); 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_read_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) return -EINVAL; reg = object->start_address; return __mxt_read_reg(data->client, reg + offset, 1, val); } 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) return -EINVAL; reg = object->start_address; return mxt_write_reg(data->client, reg + offset, val); } static void mxt_input_report(struct mxt_data *data, int single_id) { struct mxt_finger *finger = data->finger; struct input_dev *input_dev = data->input_dev; int status = finger[single_id].status; int finger_num = 0; int id; for (id = 0; id < MXT_MAX_FINGER; id++) { if (!finger[id].status) continue; input_mt_slot(input_dev, id); input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, finger[id].status != MXT_RELEASE); if (finger[id].status != MXT_RELEASE) { finger_num++; input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, finger[id].area); input_report_abs(input_dev, ABS_MT_POSITION_X, finger[id].x); input_report_abs(input_dev, ABS_MT_POSITION_Y, finger[id].y); input_report_abs(input_dev, ABS_MT_PRESSURE, finger[id].pressure); } else { finger[id].status = 0; } } input_report_key(input_dev, BTN_TOUCH, finger_num > 0); if (status != MXT_RELEASE) { input_report_abs(input_dev, ABS_X, finger[single_id].x); input_report_abs(input_dev, ABS_Y, finger[single_id].y); input_report_abs(input_dev, ABS_PRESSURE, finger[single_id].pressure); } input_sync(input_dev); } static void mxt_input_touchevent(struct mxt_data *data, struct mxt_message *message, int id) { struct mxt_finger *finger = data->finger; struct device *dev = &data->client->dev; u8 status = message->message[0]; int x; int y; int area; int pressure; /* Check the touch is present on the screen */ if (!(status & MXT_DETECT)) { if (status & MXT_RELEASE) { dev_dbg(dev, "[%d] released\n", id); finger[id].status = MXT_RELEASE; mxt_input_report(data, id); } return; } /* Check only AMP detection */ if (!(status & (MXT_PRESS | MXT_MOVE))) return; 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, "[%d] %s x: %d, y: %d, area: %d\n", id, status & MXT_MOVE ? "moved" : "pressed", x, y, area); finger[id].status = status & MXT_MOVE ? MXT_MOVE : MXT_PRESS; finger[id].x = x; finger[id].y = y; finger[id].area = area; finger[id].pressure = pressure; mxt_input_report(data, id); } static irqreturn_t mxt_interrupt(int irq, void *dev_id) { struct mxt_data *data = dev_id; struct mxt_message message; struct mxt_object *object; struct device *dev = &data->client->dev; int id; u8 reportid; u8 max_reportid; u8 min_reportid; do { if (mxt_read_message(data, &message)) { dev_err(dev, "Failed to read message\n"); goto end; } reportid = message.reportid; /* whether reportid is thing of MXT_TOUCH_MULTI_T9 */ object = mxt_get_object(data, MXT_TOUCH_MULTI_T9); if (!object) goto end; max_reportid = object->max_reportid; min_reportid = max_reportid - object->num_report_ids + 1; id = reportid - min_reportid; if (reportid >= min_reportid && reportid <= max_reportid) mxt_input_touchevent(data, &message, id); else mxt_dump_message(dev, &message); } while (reportid != 0xff); end: return IRQ_HANDLED; } 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, j, config_offset; if (!pdata->config) { dev_dbg(dev, "No cfg data defined, skipping reg init\n"); return 0; } for (i = 0; i < data->info.object_num; i++) { object = data->object_table + i; if (!mxt_object_writable(object->type)) continue; for (j = 0; j < (object->size + 1) * (object->instances + 1); j++) { config_offset = index + j; if (config_offset > pdata->config_length) { dev_err(dev, "Not enough config data!\n"); return -EINVAL; } mxt_write_object(data, object->type, j, pdata->config[config_offset]); } index += (object->size + 1) * (object->instances + 1); } 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 void mxt_handle_pdata(struct mxt_data *data) { const struct mxt_platform_data *pdata = data->pdata; u8 voltage; /* Set touchscreen lines */ mxt_write_object(data, MXT_TOUCH_MULTI_T9, MXT_TOUCH_XSIZE, pdata->x_line); mxt_write_object(data, MXT_TOUCH_MULTI_T9, MXT_TOUCH_YSIZE, pdata->y_line); /* Set touchscreen orient */ mxt_write_object(data, MXT_TOUCH_MULTI_T9, MXT_TOUCH_ORIENT, pdata->orient); /* Set touchscreen burst length */ mxt_write_object(data, MXT_TOUCH_MULTI_T9, MXT_TOUCH_BLEN, pdata->blen); /* Set touchscreen threshold */ mxt_write_object(data, MXT_TOUCH_MULTI_T9, MXT_TOUCH_TCHTHR, pdata->threshold); /* Set touchscreen resolution */ mxt_write_object(data, MXT_TOUCH_MULTI_T9, MXT_TOUCH_XRANGE_LSB, (pdata->x_size - 1) & 0xff); mxt_write_object(data, MXT_TOUCH_MULTI_T9, MXT_TOUCH_XRANGE_MSB, (pdata->x_size - 1) >> 8); mxt_write_object(data, MXT_TOUCH_MULTI_T9, MXT_TOUCH_YRANGE_LSB, (pdata->y_size - 1) & 0xff); mxt_write_object(data, MXT_TOUCH_MULTI_T9, MXT_TOUCH_YRANGE_MSB, (pdata->y_size - 1) >> 8); /* Set touchscreen voltage */ if (pdata->voltage) { if (pdata->voltage < MXT_VOLTAGE_DEFAULT) { voltage = (MXT_VOLTAGE_DEFAULT - pdata->voltage) / MXT_VOLTAGE_STEP; voltage = 0xff - voltage + 1; } else voltage = (pdata->voltage - MXT_VOLTAGE_DEFAULT) / MXT_VOLTAGE_STEP; mxt_write_object(data, MXT_SPT_CTECONFIG_T28, MXT_CTE_VOLTAGE, voltage); } } static int mxt_get_info(struct mxt_data *data) { struct i2c_client *client = data->client; struct mxt_info *info = &data->info; int error; u8 val; error = mxt_read_reg(client, MXT_FAMILY_ID, &val); if (error) return error; info->family_id = val; error = mxt_read_reg(client, MXT_VARIANT_ID, &val); if (error) return error; info->variant_id = val; error = mxt_read_reg(client, MXT_VERSION, &val); if (error) return error; info->version = val; error = mxt_read_reg(client, MXT_BUILD, &val); if (error) return error; info->build = val; error = mxt_read_reg(client, MXT_OBJECT_NUM, &val); if (error) return error; info->object_num = val; return 0; } static int mxt_get_object_table(struct mxt_data *data) { int error; int i; u16 reg; u8 reportid = 0; u8 buf[MXT_OBJECT_SIZE]; for (i = 0; i < data->info.object_num; i++) { struct mxt_object *object = data->object_table + i; reg = MXT_OBJECT_START + MXT_OBJECT_SIZE * i; error = mxt_read_object_table(data->client, reg, buf); if (error) return error; object->type = buf[0]; object->start_address = (buf[2] << 8) | buf[1]; object->size = buf[3]; object->instances = buf[4]; object->num_report_ids = buf[5]; if (object->num_report_ids) { reportid += object->num_report_ids * (object->instances + 1); object->max_reportid = reportid; } } return 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) return error; /* Check register init values */ error = mxt_check_reg_init(data); if (error) return error; mxt_handle_pdata(data); /* Backup to memory */ mxt_write_object(data, MXT_GEN_COMMAND_T6, MXT_COMMAND_BACKUPNV, MXT_BACKUP_VALUE); msleep(MXT_BACKUP_TIME); /* Soft reset */ mxt_write_object(data, MXT_GEN_COMMAND_T6, MXT_COMMAND_RESET, 1); msleep(MXT_RESET_TIME); /* Update matrix size at info struct */ error = mxt_read_reg(client, MXT_MATRIX_X_SIZE, &val); if (error) return error; info->matrix_xsize = val; error = mxt_read_reg(client, MXT_MATRIX_Y_SIZE, &val); if (error) return error; info->matrix_ysize = val; dev_info(&client->dev, "Family ID: %d Variant ID: %d Version: %d Build: %d\n", info->family_id, info->variant_id, info->version, info->build); dev_info(&client->dev, "Matrix X Size: %d Matrix Y Size: %d Object Num: %d\n", info->matrix_xsize, info->matrix_ysize, info->object_num); return 0; } 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; } } 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 val; for (i = 0; i < data->info.object_num; i++) { object = data->object_table + i; count += snprintf(buf + count, PAGE_SIZE - count, "Object[%d] (Type %d)\n", i + 1, object->type); if (count >= PAGE_SIZE) return PAGE_SIZE - 1; if (!mxt_object_readable(object->type)) { count += snprintf(buf + count, PAGE_SIZE - count, "\n"); if (count >= PAGE_SIZE) return PAGE_SIZE - 1; continue; } for (j = 0; j < object->size + 1; j++) { error = mxt_read_object(data, object->type, j, &val); if (error) return error; count += snprintf(buf + count, PAGE_SIZE - count, "\t[%2d]: %02x (%d)\n", j, val, val); if (count >= PAGE_SIZE) return PAGE_SIZE - 1; } count += snprintf(buf + count, PAGE_SIZE - count, "\n"); if (count >= PAGE_SIZE) return PAGE_SIZE - 1; } return count; } static int mxt_load_fw(struct device *dev, const char *fn) { struct mxt_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; const struct firmware *fw = NULL; unsigned int frame_size; unsigned int pos = 0; int ret; ret = request_firmware(&fw, fn, dev); if (ret) { dev_err(dev, "Unable to open firmware %s\n", fn); return ret; } /* Change to the bootloader mode */ mxt_write_object(data, MXT_GEN_COMMAND_T6, MXT_COMMAND_RESET, MXT_BOOT_VALUE); msleep(MXT_RESET_TIME); /* Change to slave address of bootloader */ if (client->addr == MXT_APP_LOW) client->addr = MXT_BOOT_LOW; else client->addr = MXT_BOOT_HIGH; ret = mxt_check_bootloader(client, MXT_WAITING_BOOTLOAD_CMD); if (ret) goto out; /* Unlock bootloader */ mxt_unlock_bootloader(client); while (pos < fw->size) { ret = mxt_check_bootloader(client, MXT_WAITING_FRAME_DATA); if (ret) goto out; frame_size = ((*(fw->data + pos) << 8) | *(fw->data + pos + 1)); /* We should add 2 at frame size as the the firmware data is not * included the CRC bytes. */ frame_size += 2; /* Write one frame to device */ mxt_fw_write(client, fw->data + pos, frame_size); ret = mxt_check_bootloader(client, MXT_FRAME_CRC_PASS); if (ret) goto out; pos += frame_size; dev_dbg(dev, "Updated %d bytes / %zd bytes\n", pos, fw->size); } out: release_firmware(fw); /* Change to slave address of application */ if (client->addr == MXT_BOOT_LOW) client->addr = MXT_APP_LOW; else client->addr = MXT_APP_HIGH; 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; disable_irq(data->irq); error = mxt_load_fw(dev, MXT_FW_NAME); if (error) { dev_err(dev, "The firmware update failed(%d)\n", error); count = error; } else { dev_dbg(dev, "The firmware update succeeded\n"); /* Wait for reset */ msleep(MXT_FWRESET_TIME); kfree(data->object_table); data->object_table = NULL; mxt_initialize(data); } enable_irq(data->irq); error = mxt_make_highchg(data); if (error) return error; return count; } static DEVICE_ATTR(object, 0444, mxt_object_show, NULL); static DEVICE_ATTR(update_fw, 0664, NULL, mxt_update_fw_store); static struct attribute *mxt_attrs[] = { &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 __devinit mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) { const struct mxt_platform_data *pdata = client->dev.platform_data; struct mxt_data *data; struct input_dev *input_dev; int error; 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"; 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; mxt_calc_resolution(data); __set_bit(EV_ABS, input_dev->evbit); __set_bit(EV_KEY, input_dev->evbit); __set_bit(BTN_TOUCH, input_dev->keybit); /* 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 */ input_mt_init_slots(input_dev, MXT_MAX_FINGER); 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 = mxt_initialize(data); if (error) goto err_free_object; error = request_threaded_irq(client->irq, NULL, mxt_interrupt, pdata->irqflags, client->dev.driver->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) goto err_free_irq; error = sysfs_create_group(&client->dev.kobj, &mxt_attr_group); if (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 __devexit 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 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; /* Soft reset */ mxt_write_object(data, MXT_GEN_COMMAND_T6, MXT_COMMAND_RESET, 1); msleep(MXT_RESET_TIME); mutex_lock(&input_dev->mutex); if (input_dev->users) mxt_start(data); mutex_unlock(&input_dev->mutex); return 0; } static const struct dev_pm_ops mxt_pm_ops = { .suspend = mxt_suspend, .resume = mxt_resume, }; #endif static const struct i2c_device_id mxt_id[] = { { "qt602240_ts", 0 }, { "atmel_mxt_ts", 0 }, { "mXT224", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, mxt_id); static struct i2c_driver mxt_driver = { .driver = { .name = "atmel_mxt_ts", .owner = THIS_MODULE, #ifdef CONFIG_PM .pm = &mxt_pm_ops, #endif }, .probe = mxt_probe, .remove = __devexit_p(mxt_remove), .id_table = mxt_id, }; static int __init mxt_init(void) { return i2c_add_driver(&mxt_driver); } static void __exit mxt_exit(void) { i2c_del_driver(&mxt_driver); } module_init(mxt_init); module_exit(mxt_exit); /* Module information */ MODULE_AUTHOR("Joonyoung Shim "); MODULE_DESCRIPTION("Atmel maXTouch Touchscreen driver"); MODULE_LICENSE("GPL");