/* * Atmel maXTouch Touchscreen Controller * * * Copyright (C) 2010 Atmel Corporation * Copyright (C) 2009 Raphael Derosso Pereira * Copyright (C) 2011 NVIDIA Corporation * * 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. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include #include #include #include #include #include /* * This is a driver for the Atmel maXTouch Object Protocol * * When the driver is loaded, mxt_init is called. * mxt_driver registers the "mxt_driver" structure in the i2c subsystem * The mxt_idtable.name string allows the board support to associate * the driver with its own data. * * The i2c subsystem will call the mxt_driver.probe == mxt_probe * to detect the device. * mxt_probe will reset the maXTouch device, and then * determine the capabilities of the I2C peripheral in the * host processor (needs to support BYTE transfers) * * If OK; mxt_probe will try to identify which maXTouch device it is * by calling mxt_identify. * * If a known device is found, a linux input device is initialized * the "mxt" device data structure is allocated, * as well as an input device structure "mxt->input" * "mxt->client" is provided as a parameter to mxt_probe. * * mxt_read_object_table is called to determine which objects * are present in the device, and to determine their adresses. * * * Addressing an object: * * The object is located at a 16-bit address in the object address space. * * The address is provided through an object descriptor table in the beginning * of the object address space. This address can change between firmware * revisions, so it's important that the driver will make no assumptions * about addresses but instead reads the object table and gets the correct * addresses there. * * Each object type can have several instances, and the number of * instances is available in the object table as well. * * The base address of the first instance of an object is stored in * "mxt->object_table[object_type].chip_addr", * This is indexed by the object type and allows direct access to the * first instance of an object. * * Each instance of an object is assigned a "Report Id" uniquely identifying * this instance. Information about this instance is available in the * "mxt->report_id" variable, which is a table indexed by the "Report Id". * * The maXTouch object protocol supports adding a checksum to messages. * By setting the most significant bit of the maXTouch address, * an 8 bit checksum is added to all writes. * * * How to use driver. * ----------------- * Example: * In arch/avr32/boards/atstk1000/atstk1002.c * an "i2c_board_info" descriptor is declared. * This contains info about which driver ("mXT224"), * which i2c address and which pin for CHG interrupts are used. * * In the "atstk1002_init" routine, "i2c_register_board_info" is invoked * with this information. Also, the I/O pins are configured, and the I2C * controller registered is on the application processor. * * */ static int debug = NO_DEBUG; static int comms; module_param(debug, int, 0644); module_param(comms, int, 0644); MODULE_PARM_DESC(debug, "Activate debugging output"); MODULE_PARM_DESC(comms, "Select communications mode"); /* Device Info descriptor */ /* Parsed from maXTouch "Id information" inside device */ struct mxt_device_info { u8 family_id; u8 variant_id; u8 major; u8 minor; u8 build; u8 num_objs; u8 x_size; u8 y_size; char family_name[16]; /* Family name */ char variant_name[16]; /* Variant name */ u16 num_nodes; /* Number of sensor nodes */ }; /* object descriptor table, parsed from maXTouch "object table" */ struct mxt_object { u16 chip_addr; u8 type; u8 size; u8 instances; u8 num_report_ids; }; /* Mapping from report id to object type and instance */ struct report_id_map { u8 object; u8 instance; /* * This is the first report ID belonging to object. It enables us to * find out easily the touch number: each touch has different report * ID (which are assigned to touches in increasing order). By * subtracting the first report ID from current, we get the touch * number. */ u8 first_rid; }; /* Driver datastructure */ struct mxt_data { struct i2c_client *client; struct input_dev *input; char phys_name[32]; int irq; u16 last_read_addr; bool new_msgs; u8 *last_message; int valid_irq_counter; int invalid_irq_counter; int irq_counter; int message_counter; int read_fail_counter; int bytes_to_read; struct delayed_work dwork; u8 xpos_format; u8 ypos_format; u8 numtouch; struct mxt_device_info device_info; u32 info_block_crc; u32 configuration_crc; u16 report_id_count; struct report_id_map *rid_map; struct mxt_object *object_table; u16 msg_proc_addr; u8 message_size; u16 max_x_val; u16 max_y_val; void (*init_hw) (void); void (*exit_hw) (void); u8(*valid_interrupt) (void); u8(*read_chg) (void); /* debugfs variables */ struct dentry *debug_dir; int current_debug_datap; struct mutex debug_mutex; u16 *debug_data; /* Character device variables */ struct cdev cdev; struct cdev cdev_messages; /* 2nd Char dev for messages */ dev_t dev_num; struct class *mxt_class; u16 address_pointer; bool valid_ap; /* Message buffer & pointers */ char *messages; int msg_buffer_startp, msg_buffer_endp; /* Put only non-touch messages to buffer if this is set */ char nontouch_msg_only; struct mutex msg_mutex; struct early_suspend early_suspend; }; #define I2C_RETRY_COUNT 5 #define I2C_PAYLOAD_SIZE 254 /* Returns the start address of object in mXT memory. */ #define MXT_BASE_ADDR(object_type, mxt) \ get_object_address(object_type, 0, mxt->object_table, \ mxt->device_info.num_objs) /* Maps a report ID to an object type (object type number). */ #define REPORT_ID_TO_OBJECT(rid, mxt) \ (((rid) == 0xff) ? 0 : mxt->rid_map[rid].object) /* Maps a report ID to an object type (string). */ #define REPORT_ID_TO_OBJECT_NAME(rid, mxt) \ object_type_name[REPORT_ID_TO_OBJECT(rid, mxt)] /* Returns non-zero if given object is a touch object */ #define IS_TOUCH_OBJECT(object) \ ((object == MXT_TOUCH_MULTITOUCHSCREEN_T9) || \ (object == MXT_TOUCH_KEYARRAY_T15) || \ (object == MXT_TOUCH_PROXIMITY_T23) || \ (object == MXT_TOUCH_SINGLETOUCHSCREEN_T10) || \ (object == MXT_TOUCH_XSLIDER_T11) || \ (object == MXT_TOUCH_YSLIDER_T12) || \ (object == MXT_TOUCH_XWHEEL_T13) || \ (object == MXT_TOUCH_YWHEEL_T14) || \ (object == MXT_TOUCH_KEYSET_T31) || \ (object == MXT_TOUCH_XSLIDERSET_T32) ? 1 : 0) #define mxt_debug(level, ...) \ do { \ if (debug >= (level)) \ pr_debug(__VA_ARGS__); \ } while (0) static const u8 *object_type_name[] = { [0] = "Reserved", [5] = "GEN_MESSAGEPROCESSOR_T5", [6] = "GEN_COMMANDPROCESSOR_T6", [7] = "GEN_POWERCONFIG_T7", [8] = "GEN_ACQUIRECONFIG_T8", [9] = "TOUCH_MULTITOUCHSCREEN_T9", [15] = "TOUCH_KEYARRAY_T15", [17] = "SPT_COMMSCONFIG_T18", [19] = "SPT_GPIOPWM_T19", [20] = "PROCI_GRIPFACESUPPRESSION_T20", [22] = "PROCG_NOISESUPPRESSION_T22", [23] = "TOUCH_PROXIMITY_T23", [24] = "PROCI_ONETOUCHGESTUREPROCESSOR_T24", [25] = "SPT_SELFTEST_T25", [27] = "PROCI_TWOTOUCHGESTUREPROCESSOR_T27", [28] = "SPT_CTECONFIG_T28", [37] = "DEBUG_DIAGNOSTICS_T37", [38] = "SPT_USER_DATA_T38", [40] = "PROCI_GRIPSUPPRESSION_T40", [41] = "PROCI_PALMSUPPRESSION_T41", [42] = "PROCI_FACESUPPRESSION_T42", [43] = "SPT_DIGITIZER_T43", [44] = "SPT_MESSAGECOUNT_T44", }; static u16 get_object_address(uint8_t object_type, uint8_t instance, struct mxt_object *object_table, int max_objs); static int mxt_write_ap(struct mxt_data *mxt, u16 ap); static int mxt_read_block_wo_addr(struct i2c_client *client, u16 length, u8 *value); /* Routines for memory access within a 16 bit address space */ static int mxt_read_block(struct i2c_client *client, u16 addr, u16 length, u8 *value); static int mxt_write_byte(struct i2c_client *client, u16 addr, u8 value); static int mxt_write_block(struct i2c_client *client, u16 addr, u16 length, u8 *value); /* TODO: */ /* Bootloader specific function prototypes. */ /* static int mxt_read_byte_bl(struct i2c_client *client, u8 * value) { return 0; } static int mxt_read_block_bl(struct i2c_client *client, u16 length, u8 * value) { return 0; } static int mxt_write_byte_bl(struct i2c_client *client, u8 value) { return 0; } static int mxt_write_block_bl(struct i2c_client *client, u16 length, u8 *value) { return 0; } */ static u8 mxt_valid_interrupt_dummy(void) { return 1; } ssize_t debug_data_read(struct mxt_data *mxt, char *buf, size_t count, loff_t *ppos, u8 debug_command) { int i; u16 *data; u16 diagnostics_reg; int offset = 0; int size; int read_size; int error; char *buf_start; u16 debug_data_addr; u16 page_address; u8 page; u8 debug_command_reg; data = mxt->debug_data; if (data == NULL) return -EIO; /* If first read after open, read all data to buffer. */ if (mxt->current_debug_datap == 0) { diagnostics_reg = MXT_BASE_ADDR(MXT_GEN_COMMANDPROCESSOR_T6, mxt) + MXT_ADR_T6_DIAGNOSTIC; if (count > (mxt->device_info.num_nodes * 2)) count = mxt->device_info.num_nodes; debug_data_addr = MXT_BASE_ADDR(MXT_DEBUG_DIAGNOSTIC_T37, mxt) + MXT_ADR_T37_DATA; page_address = MXT_BASE_ADDR(MXT_DEBUG_DIAGNOSTIC_T37, mxt) + MXT_ADR_T37_PAGE; error = mxt_read_block(mxt->client, page_address, 1, &page); if (error < 0) return error; mxt_debug(DEBUG_TRACE, "debug data page = %d\n", page); while (page != 0) { error = mxt_write_byte(mxt->client, diagnostics_reg, MXT_CMD_T6_PAGE_DOWN); if (error < 0) return error; /* Wait for command to be handled; when it has, the register will be cleared. */ debug_command_reg = 1; while (debug_command_reg != 0) { error = mxt_read_block(mxt->client, diagnostics_reg, 1, &debug_command_reg); if (error < 0) return error; mxt_debug(DEBUG_TRACE, "Waiting for debug diag command " "to propagate...\n"); } error = mxt_read_block(mxt->client, page_address, 1, &page); if (error < 0) return error; mxt_debug(DEBUG_TRACE, "debug data page = %d\n", page); } /* * Lock mutex to prevent writing some unwanted data to debug * command register. User can still write through the char * device interface though. TODO: fix? */ mutex_lock(&mxt->debug_mutex); /* Configure Debug Diagnostics object to show deltas/refs */ error = mxt_write_byte(mxt->client, diagnostics_reg, debug_command); /* Wait for command to be handled; when it has, the * register will be cleared. */ debug_command_reg = 1; while (debug_command_reg != 0) { error = mxt_read_block(mxt->client, diagnostics_reg, 1, &debug_command_reg); if (error < 0) return error; mxt_debug(DEBUG_TRACE, "Waiting for debug diag command " "to propagate...\n"); } if (error < 0) { printk(KERN_WARNING "Error writing to maXTouch device!\n"); return error; } size = mxt->device_info.num_nodes * sizeof(u16); while (size > 0) { read_size = size > 128 ? 128 : size; mxt_debug(DEBUG_TRACE, "Debug data read loop, reading %d bytes...\n", read_size); error = mxt_read_block(mxt->client, debug_data_addr, read_size, (u8 *) &data[offset]); if (error < 0) { printk(KERN_WARNING "Error reading debug data\n"); goto error; } offset += read_size / 2; size -= read_size; /* Select next page */ error = mxt_write_byte(mxt->client, diagnostics_reg, MXT_CMD_T6_PAGE_UP); if (error < 0) { printk(KERN_WARNING "Error writing to maXTouch device!\n"); goto error; } } mutex_unlock(&mxt->debug_mutex); } buf_start = buf; i = mxt->current_debug_datap; while (((buf - buf_start) < (count - 6)) && (i < mxt->device_info.num_nodes)) { mxt->current_debug_datap++; if (debug_command == MXT_CMD_T6_REFERENCES_MODE) buf += sprintf(buf, "%d: %5d\n", i, (u16) le16_to_cpu(data[i])); else if (debug_command == MXT_CMD_T6_DELTAS_MODE) buf += sprintf(buf, "%d: %5d\n", i, (s16) le16_to_cpu(data[i])); i++; } return buf - buf_start; error: mutex_unlock(&mxt->debug_mutex); return error; } ssize_t deltas_read(struct file *file, char *buf, size_t count, loff_t *ppos) { return debug_data_read(file->private_data, buf, count, ppos, MXT_CMD_T6_DELTAS_MODE); } ssize_t refs_read(struct file *file, char *buf, size_t count, loff_t *ppos) { return debug_data_read(file->private_data, buf, count, ppos, MXT_CMD_T6_REFERENCES_MODE); } int debug_data_open(struct inode *inode, struct file *file) { struct mxt_data *mxt; int i; mxt = inode->i_private; if (mxt == NULL) return -EIO; mxt->current_debug_datap = 0; mxt->debug_data = kmalloc(mxt->device_info.num_nodes * sizeof(u16), GFP_KERNEL); if (mxt->debug_data == NULL) return -ENOMEM; for (i = 0; i < mxt->device_info.num_nodes; i++) mxt->debug_data[i] = 7777; file->private_data = mxt; return 0; } int debug_data_release(struct inode *inode, struct file *file) { struct mxt_data *mxt; mxt = file->private_data; kfree(mxt->debug_data); return 0; } const struct file_operations delta_fops = { .owner = THIS_MODULE, .open = debug_data_open, .release = debug_data_release, .read = deltas_read, }; const struct file_operations refs_fops = { .owner = THIS_MODULE, .open = debug_data_open, .release = debug_data_release, .read = refs_read, }; int mxt_memory_open(struct inode *inode, struct file *file) { struct mxt_data *mxt; mxt = container_of(inode->i_cdev, struct mxt_data, cdev); if (mxt == NULL) return -EIO; file->private_data = mxt; return 0; } int mxt_message_open(struct inode *inode, struct file *file) { struct mxt_data *mxt; mxt = container_of(inode->i_cdev, struct mxt_data, cdev_messages); if (mxt == NULL) return -EIO; file->private_data = mxt; return 0; } ssize_t mxt_memory_read(struct file *file, char *buf, size_t count, loff_t *ppos) { int i; struct mxt_data *mxt; mxt = file->private_data; if (mxt->valid_ap) { mxt_debug(DEBUG_TRACE, "Reading %d bytes from current ap\n", (int)count); i = mxt_read_block_wo_addr(mxt->client, count, (u8 *) buf); } else { mxt_debug(DEBUG_TRACE, "Address pointer changed since set;" "writing AP (%d) before reading %d bytes", mxt->address_pointer, (int)count); i = mxt_read_block(mxt->client, mxt->address_pointer, count, buf); } return i; } ssize_t mxt_memory_write(struct file *file, const char *buf, size_t count, loff_t *ppos) { int i; int whole_blocks; int last_block_size; struct mxt_data *mxt; u16 address; mxt = file->private_data; address = mxt->address_pointer; mxt_debug(DEBUG_TRACE, "mxt_memory_write entered\n"); whole_blocks = count / I2C_PAYLOAD_SIZE; last_block_size = count % I2C_PAYLOAD_SIZE; for (i = 0; i < whole_blocks; i++) { mxt_debug(DEBUG_TRACE, "About to write to %d...", address); mxt_write_block(mxt->client, address, I2C_PAYLOAD_SIZE, (u8 *) buf); address += I2C_PAYLOAD_SIZE; buf += I2C_PAYLOAD_SIZE; } mxt_write_block(mxt->client, address, last_block_size, (u8 *) buf); return count; } long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); static long mxt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { int retval; struct mxt_data *mxt; retval = 0; mxt = file->private_data; switch (cmd) { case MXT_SET_ADDRESS: retval = mxt_write_ap(mxt, (u16) arg); if (retval >= 0) { mxt->address_pointer = (u16) arg; mxt->valid_ap = 1; } break; case MXT_RESET: retval = mxt_write_byte(mxt->client, MXT_BASE_ADDR (MXT_GEN_COMMANDPROCESSOR_T6, mxt) + MXT_ADR_T6_RESET, 1); break; case MXT_CALIBRATE: retval = mxt_write_byte(mxt->client, MXT_BASE_ADDR (MXT_GEN_COMMANDPROCESSOR_T6, mxt) + MXT_ADR_T6_CALIBRATE, 1); break; case MXT_BACKUP: retval = mxt_write_byte(mxt->client, MXT_BASE_ADDR (MXT_GEN_COMMANDPROCESSOR_T6, mxt) + MXT_ADR_T6_BACKUPNV, MXT_CMD_T6_BACKUP); break; case MXT_NONTOUCH_MSG: mxt->nontouch_msg_only = 1; break; case MXT_ALL_MSG: mxt->nontouch_msg_only = 0; break; default: return (long)(-EIO); } return (long)retval; } /* * Copies messages from buffer to user space. * * NOTE: if less than (mxt->message_size * 5 + 1) bytes requested, * this will return 0! * */ ssize_t mxt_message_read(struct file *file, char *buf, size_t count, loff_t *ppos) { int i; struct mxt_data *mxt; char *buf_start; mxt = file->private_data; if (mxt == NULL) return -EIO; buf_start = buf; mutex_lock(&mxt->msg_mutex); /* Copy messages until buffer empty, or 'count' bytes written */ while ((mxt->msg_buffer_startp != mxt->msg_buffer_endp) && ((buf - buf_start) < (count - 5 * mxt->message_size - 1))) { for (i = 0; i < mxt->message_size; i++) { buf += sprintf(buf, "[%2X] ", *(mxt->messages + mxt->msg_buffer_endp * mxt->message_size + i)); } buf += sprintf(buf, "\n"); if (mxt->msg_buffer_endp < MXT_MESSAGE_BUFFER_SIZE) mxt->msg_buffer_endp++; else mxt->msg_buffer_endp = 0; } mutex_unlock(&mxt->msg_mutex); return buf - buf_start; } const struct file_operations mxt_message_fops = { .owner = THIS_MODULE, .open = mxt_message_open, .read = mxt_message_read, }; const struct file_operations mxt_memory_fops = { .owner = THIS_MODULE, .open = mxt_memory_open, .read = mxt_memory_read, .write = mxt_memory_write, .unlocked_ioctl = mxt_ioctl, }; /* Writes the address pointer (to set up following reads). */ int mxt_write_ap(struct mxt_data *mxt, u16 ap) { struct i2c_client *client; __le16 le_ap = cpu_to_le16(ap); client = mxt->client; if (mxt != NULL) mxt->last_read_addr = -1; if (i2c_master_send(client, (u8 *) &le_ap, 2) == 2) { mxt_debug(DEBUG_TRACE, "Address pointer set to %d\n", ap); return 0; } else { mxt_debug(DEBUG_INFO, "Error writing address pointer!\n"); return -EIO; } } /* Calculates the 24-bit CRC sum. */ static u32 CRC_24(u32 crc, u8 byte1, u8 byte2) { static const u32 crcpoly = 0x80001B; u32 result; u32 data_word; data_word = ((((u16) byte2) << 8u) | byte1); result = ((crc << 1u) ^ data_word); if (result & 0x1000000) result ^= crcpoly; return result; } /* Returns object address in mXT chip, or zero if object is not found */ static u16 get_object_address(uint8_t object_type, uint8_t instance, struct mxt_object *object_table, int max_objs) { uint8_t object_table_index = 0; uint8_t address_found = 0; uint16_t address = 0; struct mxt_object *obj; while ((object_table_index < max_objs) && !address_found) { obj = &object_table[object_table_index]; if (obj->type == object_type) { address_found = 1; /* Are there enough instances defined in the FW? */ if (obj->instances >= instance) { address = obj->chip_addr + (obj->size + 1) * instance; } else { return 0; } } object_table_index++; } return address; } /* * Reads a block of bytes from given address from mXT chip. If we are * reading from message window, and previous read was from message window, * there's no need to write the address pointer: the mXT chip will * automatically set the address pointer back to message window start. */ static int mxt_read_block(struct i2c_client *client, u16 addr, u16 length, u8 *value) { struct i2c_adapter *adapter = client->adapter; struct i2c_msg msg[2]; __le16 le_addr; struct mxt_data *mxt; mxt = i2c_get_clientdata(client); if (mxt != NULL) { if ((mxt->last_read_addr == addr) && (addr == mxt->msg_proc_addr)) { if (i2c_master_recv(client, value, length) == length) return length; else return -EIO; } else { mxt->last_read_addr = addr; } } mxt_debug(DEBUG_TRACE, "Writing address pointer & reading %d bytes " "in on i2c transaction...\n", length); le_addr = cpu_to_le16(addr); msg[0].addr = client->addr; msg[0].flags = 0x00; msg[0].len = 2; msg[0].buf = (u8 *) &le_addr; msg[1].addr = client->addr; msg[1].flags = I2C_M_RD; msg[1].len = length; msg[1].buf = (u8 *) value; if (i2c_transfer(adapter, msg, 2) == 2) return length; else return -EIO; } /* Reads a block of bytes from current address from mXT chip. */ static int mxt_read_block_wo_addr(struct i2c_client *client, u16 length, u8 *value) { if (i2c_master_recv(client, value, length) == length) { mxt_debug(DEBUG_TRACE, "I2C block read ok\n"); return length; } else { mxt_debug(DEBUG_INFO, "I2C block read failed\n"); return -EIO; } } /* Writes one byte to given address in mXT chip. */ static int mxt_write_byte(struct i2c_client *client, u16 addr, u8 value) { struct { __le16 le_addr; u8 data; } i2c_byte_transfer; struct mxt_data *mxt; mxt = i2c_get_clientdata(client); if (mxt != NULL) mxt->last_read_addr = -1; i2c_byte_transfer.le_addr = cpu_to_le16(addr); i2c_byte_transfer.data = value; if (i2c_master_send(client, (u8 *) &i2c_byte_transfer, 3) == 3) return 0; else return -EIO; } /* Writes a block of bytes (max 256) to given address in mXT chip. */ static int mxt_write_block(struct i2c_client *client, u16 addr, u16 length, u8 *value) { int i; struct { __le16 le_addr; u8 data[256]; } i2c_block_transfer; struct mxt_data *mxt; mxt_debug(DEBUG_TRACE, "Writing %d bytes to %d...", length, addr); if (length > 256) return -EINVAL; mxt = i2c_get_clientdata(client); if (mxt != NULL) mxt->last_read_addr = -1; for (i = 0; i < length; i++) i2c_block_transfer.data[i] = *value++; i2c_block_transfer.le_addr = cpu_to_le16(addr); i = i2c_master_send(client, (u8 *) &i2c_block_transfer, length + 2); if (i == (length + 2)) return length; else return -EIO; } /* Calculates the CRC value for mXT infoblock. */ int calculate_infoblock_crc(u32 *crc_result, u8 *data, int crc_area_size) { u32 crc = 0; int i; for (i = 0; i < (crc_area_size - 1); i = i + 2) crc = CRC_24(crc, *(data + i), *(data + i + 1)); /* If uneven size, pad with zero */ if (crc_area_size & 0x0001) crc = CRC_24(crc, *(data + i), 0); /* Return only 24 bits of CRC. */ *crc_result = (crc & 0x00FFFFFF); return 0; } void process_T9_message(u8 *message, struct mxt_data *mxt, int last_touch) { struct input_dev *input; u8 status; u16 xpos = 0xFFFF; u16 ypos = 0xFFFF; u8 touch_size = 255; u8 touch_number; u8 amplitude; u8 report_id; static int stored_size[10]; static int stored_x[10]; static int stored_y[10]; int i; int active_touches = 0; /* * If the 'last_touch' flag is set, we have received all the touch messages * there are available in this cycle, so send the events for touches that are * active. */ if (last_touch) { for (i = 0; i < 10; i++) { if (stored_size[i]) { active_touches++; input_report_abs(mxt->input, ABS_MT_TRACKING_ID, i); input_report_abs(mxt->input, ABS_MT_TOUCH_MAJOR, stored_size[i]); input_report_abs(mxt->input, ABS_MT_POSITION_X, stored_x[i]); input_report_abs(mxt->input, ABS_MT_POSITION_Y, stored_y[i]); input_mt_sync(mxt->input); } } if (active_touches) input_sync(mxt->input); else { input_mt_sync(mxt->input); input_sync(mxt->input); } } else { input = mxt->input; status = message[MXT_MSG_T9_STATUS]; report_id = message[0]; if (status & MXT_MSGB_T9_SUPPRESS) { /* Touch has been suppressed by grip/face */ /* detection */ mxt_debug(DEBUG_TRACE, "SUPRESS"); } else { xpos = message[MXT_MSG_T9_XPOSMSB] * 16 + ((message[MXT_MSG_T9_XYPOSLSB] >> 4) & 0xF); ypos = message[MXT_MSG_T9_YPOSMSB] * 16 + ((message[MXT_MSG_T9_XYPOSLSB] >> 0) & 0xF); if (mxt->max_x_val < 1024) xpos >>= 2; if (mxt->max_y_val < 1024) ypos >>= 2; touch_number = message[MXT_MSG_REPORTID] - mxt->rid_map[report_id].first_rid; stored_x[touch_number] = xpos; stored_y[touch_number] = ypos; if (status & MXT_MSGB_T9_DETECT) { /* * TODO: more precise touch size calculation? * mXT224 reports the number of touched nodes, * so the exact value for touch ellipse major * axis length would be 2*sqrt(touch_size/pi) * (assuming round touch shape). */ touch_size = message[MXT_MSG_T9_TCHAREA]; touch_size = touch_size >> 2; if (!touch_size) touch_size = 1; stored_size[touch_number] = touch_size; if (status & MXT_MSGB_T9_AMP) /* Amplitude of touch has changed */ amplitude = message[MXT_MSG_T9_TCHAMPLITUDE]; } if (status & MXT_MSGB_T9_RELEASE) { /* The previously reported touch has been removed. */ stored_size[touch_number] = 0; } } if (status & MXT_MSGB_T9_SUPPRESS) { mxt_debug(DEBUG_TRACE, "SUPRESS"); } else { if (status & MXT_MSGB_T9_DETECT) { mxt_debug(DEBUG_TRACE, "DETECT:%s%s%s%s", ((status & MXT_MSGB_T9_PRESS) ? " PRESS" : ""), ((status & MXT_MSGB_T9_MOVE) ? " MOVE" : ""), ((status & MXT_MSGB_T9_AMP) ? " AMP" : ""), ((status & MXT_MSGB_T9_VECTOR) ? " VECT" : "")); } else if (status & MXT_MSGB_T9_RELEASE) { mxt_debug(DEBUG_TRACE, "RELEASE"); } } mxt_debug(DEBUG_TRACE, "X=%d, Y=%d, TOUCHSIZE=%d", xpos, ypos, touch_size); } return; } int process_message(u8 *message, u8 object, struct mxt_data *mxt) { struct i2c_client *client; u8 status; u16 xpos = 0xFFFF; u16 ypos = 0xFFFF; u8 event; u8 length; u8 report_id; client = mxt->client; length = mxt->message_size; report_id = message[0]; if ((mxt->nontouch_msg_only == 0) || (!IS_TOUCH_OBJECT(object))) { mutex_lock(&mxt->msg_mutex); /* Copy the message to buffer */ if (mxt->msg_buffer_startp < MXT_MESSAGE_BUFFER_SIZE) mxt->msg_buffer_startp++; else mxt->msg_buffer_startp = 0; if (mxt->msg_buffer_startp == mxt->msg_buffer_endp) { mxt_debug(DEBUG_TRACE, "Message buf full, discarding last entry.\n"); if (mxt->msg_buffer_endp < MXT_MESSAGE_BUFFER_SIZE) mxt->msg_buffer_endp++; else mxt->msg_buffer_endp = 0; } memcpy((mxt->messages + mxt->msg_buffer_startp * length), message, length); mutex_unlock(&mxt->msg_mutex); } switch (object) { case MXT_GEN_COMMANDPROCESSOR_T6: status = message[1]; if (status & MXT_MSGB_T6_COMSERR) dev_err(&client->dev, "maXTouch checksum error\n"); if (status & MXT_MSGB_T6_CFGERR) { /* * Configuration error. A proper configuration * needs to be written to chip and backed up. Refer * to protocol document for further info. */ dev_err(&client->dev, "maXTouch configuration error\n"); } if (status & MXT_MSGB_T6_CAL) { /* Calibration in action, no need to react */ dev_info(&client->dev, "maXTouch calibration in progress\n"); } if (status & MXT_MSGB_T6_SIGERR) { /* * Signal acquisition error, something is seriously * wrong, not much we can in the driver to correct * this */ dev_err(&client->dev, "maXTouch acquisition error\n"); } if (status & MXT_MSGB_T6_OFL) { /* * Cycle overflow, the acquisition is too short. * Can happen temporarily when there's a complex * touch shape on the screen requiring lots of * processing. */ dev_err(&client->dev, "maXTouch cycle overflow\n"); } if (status & MXT_MSGB_T6_RESET) { /* Chip has reseted, no need to react. */ dev_info(&client->dev, "maXTouch chip reset\n"); } if (status == 0) { /* Chip status back to normal. */ dev_info(&client->dev, "maXTouch status normal\n"); } break; case MXT_TOUCH_MULTITOUCHSCREEN_T9: process_T9_message(message, mxt, 0); break; case MXT_SPT_GPIOPWM_T19: if (debug >= DEBUG_TRACE) dev_info(&client->dev, "Receiving GPIO message\n"); break; case MXT_PROCI_GRIPFACESUPPRESSION_T20: if (debug >= DEBUG_TRACE) dev_info(&client->dev, "Receiving face suppression msg\n"); break; case MXT_PROCG_NOISESUPPRESSION_T22: if (debug >= DEBUG_TRACE) dev_info(&client->dev, "Receiving noise suppression msg\n"); status = message[MXT_MSG_T22_STATUS]; if (status & MXT_MSGB_T22_FHCHG) { if (debug >= DEBUG_TRACE) dev_info(&client->dev, "maXTouch: Freq changed\n"); } if (status & MXT_MSGB_T22_GCAFERR) { if (debug >= DEBUG_TRACE) dev_info(&client->dev, "maXTouch: High noise " "level\n"); } if (status & MXT_MSGB_T22_FHERR) { if (debug >= DEBUG_TRACE) dev_info(&client->dev, "maXTouch: Freq changed - " "Noise level too high\n"); } break; case MXT_PROCI_ONETOUCHGESTUREPROCESSOR_T24: if (debug >= DEBUG_TRACE) dev_info(&client->dev, "Receiving one-touch gesture msg\n"); event = message[MXT_MSG_T24_STATUS] & 0x0F; xpos = message[MXT_MSG_T24_XPOSMSB] * 16 + ((message[MXT_MSG_T24_XYPOSLSB] >> 4) & 0x0F); ypos = message[MXT_MSG_T24_YPOSMSB] * 16 + ((message[MXT_MSG_T24_XYPOSLSB] >> 0) & 0x0F); xpos >>= 2; ypos >>= 2; switch (event) { case MT_GESTURE_RESERVED: break; case MT_GESTURE_PRESS: break; case MT_GESTURE_RELEASE: break; case MT_GESTURE_TAP: break; case MT_GESTURE_DOUBLE_TAP: break; case MT_GESTURE_FLICK: break; case MT_GESTURE_DRAG: break; case MT_GESTURE_SHORT_PRESS: break; case MT_GESTURE_LONG_PRESS: break; case MT_GESTURE_REPEAT_PRESS: break; case MT_GESTURE_TAP_AND_PRESS: break; case MT_GESTURE_THROW: break; default: break; } break; case MXT_SPT_SELFTEST_T25: if (debug >= DEBUG_TRACE) dev_info(&client->dev, "Receiving Self-Test msg\n"); if (message[MXT_MSG_T25_STATUS] == MXT_MSGR_T25_OK) { if (debug >= DEBUG_TRACE) dev_info(&client->dev, "maXTouch: Self-Test OK\n"); } else { dev_err(&client->dev, "maXTouch: Self-Test Failed [%02x]:" "{%02x,%02x,%02x,%02x,%02x}\n", message[MXT_MSG_T25_STATUS], message[MXT_MSG_T25_STATUS + 0], message[MXT_MSG_T25_STATUS + 1], message[MXT_MSG_T25_STATUS + 2], message[MXT_MSG_T25_STATUS + 3], message[MXT_MSG_T25_STATUS + 4] ); } break; case MXT_PROCI_TWOTOUCHGESTUREPROCESSOR_T27: if (debug >= DEBUG_TRACE) dev_info(&client->dev, "Receiving 2-touch gesture message\n"); break; case MXT_SPT_CTECONFIG_T28: if (debug >= DEBUG_TRACE) dev_info(&client->dev, "Receiving CTE message...\n"); status = message[MXT_MSG_T28_STATUS]; if (status & MXT_MSGB_T28_CHKERR) dev_err(&client->dev, "maXTouch: Power-Up CRC failure\n"); break; default: if (debug >= DEBUG_TRACE) dev_info(&client->dev, "maXTouch: Unknown message!\n"); break; } return 0; } /* * Processes messages when the interrupt line (CHG) is asserted. Keeps * reading messages until a message with report ID 0xFF is received, * which indicates that there is no more new messages. * */ static void mxt_worker(struct work_struct *work) { struct mxt_data *mxt; struct i2c_client *client; u8 *message; u16 message_length; u16 message_addr; u8 report_id; u8 object; int error; int i; char *message_string; char *message_start; message = NULL; mxt = container_of(work, struct mxt_data, dwork.work); disable_irq(mxt->irq); client = mxt->client; message_addr = mxt->msg_proc_addr; message_length = mxt->message_size; if (message_length < 256) { message = kmalloc(message_length, GFP_KERNEL); if (message == NULL) { dev_err(&client->dev, "Error allocating memory\n"); return; } } else { dev_err(&client->dev, "Message length larger than 256 bytes not supported\n"); return; } mxt_debug(DEBUG_TRACE, "maXTouch worker active: \n"); do { /* Read next message, reread on failure. */ /* -1 TO WORK AROUND A BUG ON 0.9 FW MESSAGING, needs */ /* to be changed back if checksum is read */ mxt->message_counter++; for (i = 1; i < I2C_RETRY_COUNT; i++) { error = mxt_read_block(client, message_addr, message_length - 1, message); if (error >= 0) break; mxt->read_fail_counter++; dev_err(&client->dev, "Failure reading maxTouch device\n"); } if (error < 0) { kfree(message); return; } if (mxt->address_pointer != message_addr) mxt->valid_ap = 0; report_id = message[0]; if (debug >= DEBUG_RAW) { mxt_debug(DEBUG_RAW, "%s message [msg count: %08x]:", REPORT_ID_TO_OBJECT_NAME(report_id, mxt), mxt->message_counter); /* 5 characters per one byte */ message_string = kmalloc(message_length * 5, GFP_KERNEL); if (message_string == NULL) { dev_err(&client->dev, "Error allocating memory\n"); kfree(message); return; } message_start = message_string; for (i = 0; i < message_length; i++) { message_string += sprintf(message_string, "0x%02X ", message[i]); } mxt_debug(DEBUG_RAW, "%s", message_start); kfree(message_start); } if ((report_id != MXT_END_OF_MESSAGES) && (report_id != 0)) { memcpy(mxt->last_message, message, message_length); mxt->new_msgs = 1; smp_wmb(); /* Get type of object and process the message */ object = mxt->rid_map[report_id].object; process_message(message, object, mxt); } mxt_debug(DEBUG_TRACE, "chgline: %d\n", mxt->read_chg()); } while (comms ? (mxt->read_chg() == 0) : ((report_id != MXT_END_OF_MESSAGES) && (report_id != 0))); /* All messages processed, send the events) */ process_T9_message(NULL, mxt, 1); kfree(message); enable_irq(mxt->irq); /* Make sure we don't miss any interrupts and read changeline. */ if (mxt->read_chg() == 0) schedule_delayed_work(&mxt->dwork, 0); } /* * The maXTouch device will signal the host about a new message by asserting * the CHG line. This ISR schedules a worker routine to read the message when * that happens. */ static irqreturn_t mxt_irq_handler(int irq, void *_mxt) { struct mxt_data *mxt = _mxt; mxt->irq_counter++; if (mxt->valid_interrupt()) { /* Send the signal only if falling edge generated the irq. */ cancel_delayed_work(&mxt->dwork); schedule_delayed_work(&mxt->dwork, 0); mxt->valid_irq_counter++; } else { mxt->invalid_irq_counter++; return IRQ_NONE; } return IRQ_HANDLED; } /******************************************************************************/ /* Initialization of driver */ /******************************************************************************/ static int __devinit mxt_identify(struct i2c_client *client, struct mxt_data *mxt, u8 * id_block_data) { u8 buf[7]; int error; int identified; identified = 0; /* Read Device info to check if chip is valid */ error = mxt_read_block(client, MXT_ADDR_INFO_BLOCK, MXT_ID_BLOCK_SIZE, (u8 *) buf); if (error < 0) { mxt->read_fail_counter++; dev_err(&client->dev, "Failure accessing maXTouch device\n"); return -EIO; } memcpy(id_block_data, buf, MXT_ID_BLOCK_SIZE); mxt->device_info.family_id = buf[0]; mxt->device_info.variant_id = buf[1]; mxt->device_info.major = ((buf[2] >> 4) & 0x0F); mxt->device_info.minor = (buf[2] & 0x0F); mxt->device_info.build = buf[3]; mxt->device_info.x_size = buf[4]; mxt->device_info.y_size = buf[5]; mxt->device_info.num_objs = buf[6]; mxt->device_info.num_nodes = mxt->device_info.x_size * mxt->device_info.y_size; /* * Check Family & Variant Info; warn if not recognized but * still continue. */ /* MXT224 */ if (mxt->device_info.family_id == MXT224_FAMILYID) { strcpy(mxt->device_info.family_name, "mXT224"); if (mxt->device_info.variant_id == MXT224_CAL_VARIANTID) { strcpy(mxt->device_info.variant_name, "Calibrated"); } else if (mxt->device_info.variant_id == MXT224_UNCAL_VARIANTID) { strcpy(mxt->device_info.variant_name, "Uncalibrated"); } else { dev_err(&client->dev, "Warning: maXTouch Variant ID [%d] not " "supported\n", mxt->device_info.variant_id); strcpy(mxt->device_info.variant_name, "UNKNOWN"); /* identified = -ENXIO; */ } /* MXT1386 */ } else if (mxt->device_info.family_id == MXT1386_FAMILYID) { strcpy(mxt->device_info.family_name, "mXT1386"); if (mxt->device_info.variant_id == MXT1386_CAL_VARIANTID) { strcpy(mxt->device_info.variant_name, "Calibrated"); } else { dev_err(&client->dev, "Warning: maXTouch Variant ID [%d] not " "supported\n", mxt->device_info.variant_id); strcpy(mxt->device_info.variant_name, "UNKNOWN"); /* identified = -ENXIO; */ } /* Unknown family ID! */ } else { dev_err(&client->dev, "Warning: maXTouch Family ID [%d] not supported\n", mxt->device_info.family_id); strcpy(mxt->device_info.family_name, "UNKNOWN"); strcpy(mxt->device_info.variant_name, "UNKNOWN"); /* identified = -ENXIO; */ } dev_info(&client->dev, "Atmel maXTouch (Family %s (%X), Variant %s (%X)) Firmware " "version [%d.%d] Build %d\n", mxt->device_info.family_name, mxt->device_info.family_id, mxt->device_info.variant_name, mxt->device_info.variant_id, mxt->device_info.major, mxt->device_info.minor, mxt->device_info.build); dev_info(&client->dev, "Atmel maXTouch Configuration " "[X: %d] x [Y: %d]\n", mxt->device_info.x_size, mxt->device_info.y_size); return identified; } /* * Reads the object table from maXTouch chip to get object data like * address, size, report id. For Info Block CRC calculation, already read * id data is passed to this function too (Info Block consists of the ID * block and object table). * */ static int __devinit mxt_read_object_table(struct i2c_client *client, struct mxt_data *mxt, u8 *raw_id_data) { u16 report_id_count; u8 buf[MXT_OBJECT_TABLE_ELEMENT_SIZE]; u8 *raw_ib_data; u8 object_type; u16 object_address; u16 object_size; u8 object_instances; u8 object_report_ids; u16 object_info_address; u32 crc; u32 calculated_crc; int i; int error; u8 object_instance; u8 object_report_id; u8 report_id; int first_report_id; int ib_pointer; struct mxt_object *object_table; mxt_debug(DEBUG_TRACE, "maXTouch driver reading configuration\n"); object_table = kzalloc(sizeof(struct mxt_object) * mxt->device_info.num_objs, GFP_KERNEL); if (object_table == NULL) { printk(KERN_WARNING "maXTouch: Memory allocation failed!\n"); error = -ENOMEM; goto err_object_table_alloc; } raw_ib_data = kmalloc(MXT_OBJECT_TABLE_ELEMENT_SIZE * mxt->device_info.num_objs + MXT_ID_BLOCK_SIZE, GFP_KERNEL); if (raw_ib_data == NULL) { printk(KERN_WARNING "maXTouch: Memory allocation failed!\n"); error = -ENOMEM; goto err_ib_alloc; } /* Copy the ID data for CRC calculation. */ memcpy(raw_ib_data, raw_id_data, MXT_ID_BLOCK_SIZE); ib_pointer = MXT_ID_BLOCK_SIZE; mxt->object_table = object_table; mxt_debug(DEBUG_TRACE, "maXTouch driver Memory allocated\n"); object_info_address = MXT_ADDR_OBJECT_TABLE; report_id_count = 0; for (i = 0; i < mxt->device_info.num_objs; i++) { mxt_debug(DEBUG_TRACE, "Reading maXTouch at [0x%04x]: ", object_info_address); error = mxt_read_block(client, object_info_address, MXT_OBJECT_TABLE_ELEMENT_SIZE, buf); if (error < 0) { mxt->read_fail_counter++; dev_err(&client->dev, "maXTouch Object %d could not be read\n", i); error = -EIO; goto err_object_read; } memcpy(raw_ib_data + ib_pointer, buf, MXT_OBJECT_TABLE_ELEMENT_SIZE); ib_pointer += MXT_OBJECT_TABLE_ELEMENT_SIZE; object_type = buf[0]; object_address = (buf[2] << 8) + buf[1]; object_size = buf[3] + 1; object_instances = buf[4] + 1; object_report_ids = buf[5]; mxt_debug(DEBUG_TRACE, "Type=%03d, Address=0x%04x, " "Size=0x%02x, %d instances, %d report id's\n", object_type, object_address, object_size, object_instances, object_report_ids); /* TODO: check whether object is known and supported? */ /* Save frequently needed info. */ if (object_type == MXT_GEN_MESSAGEPROCESSOR_T5) { mxt->msg_proc_addr = object_address; mxt->message_size = object_size; printk(KERN_ALERT "message length: %d", object_size); } object_table[i].type = object_type; object_table[i].chip_addr = object_address; object_table[i].size = object_size; object_table[i].instances = object_instances; object_table[i].num_report_ids = object_report_ids; report_id_count += object_instances * object_report_ids; object_info_address += MXT_OBJECT_TABLE_ELEMENT_SIZE; } mxt->rid_map = kzalloc(sizeof(struct report_id_map) * (report_id_count + 1), /* allocate for report_id 0, even if not used */ GFP_KERNEL); if (mxt->rid_map == NULL) { printk(KERN_WARNING "maXTouch: Can't allocate memory!\n"); error = -ENOMEM; goto err_rid_map_alloc; } mxt->messages = kzalloc(mxt->message_size * MXT_MESSAGE_BUFFER_SIZE, GFP_KERNEL); if (mxt->messages == NULL) { printk(KERN_WARNING "maXTouch: Can't allocate memory!\n"); error = -ENOMEM; goto err_msg_alloc; } mxt->last_message = kzalloc(mxt->message_size, GFP_KERNEL); if (mxt->last_message == NULL) { printk(KERN_WARNING "maXTouch: Can't allocate memory!\n"); error = -ENOMEM; goto err_msg_alloc; } mxt->report_id_count = report_id_count; if (report_id_count > 254) { /* 0 & 255 are reserved */ dev_err(&client->dev, "Too many maXTouch report id's [%d]\n", report_id_count); error = -ENXIO; goto err_max_rid; } /* Create a mapping from report id to object type */ report_id = 1; /* Start from 1, 0 is reserved. */ /* Create table associating report id's with objects & instances */ for (i = 0; i < mxt->device_info.num_objs; i++) { for (object_instance = 0; object_instance < object_table[i].instances; object_instance++) { first_report_id = report_id; for (object_report_id = 0; object_report_id < object_table[i].num_report_ids; object_report_id++) { mxt->rid_map[report_id].object = object_table[i].type; mxt->rid_map[report_id].instance = object_instance; mxt->rid_map[report_id].first_rid = first_report_id; report_id++; } } } /* Read 3 byte CRC */ error = mxt_read_block(client, object_info_address, 3, buf); if (error < 0) { mxt->read_fail_counter++; dev_err(&client->dev, "Error reading CRC\n"); } crc = (buf[2] << 16) | (buf[1] << 8) | buf[0]; if (calculate_infoblock_crc(&calculated_crc, raw_ib_data, ib_pointer)) { printk(KERN_WARNING "Error while calculating CRC!\n"); calculated_crc = 0; } kfree(raw_ib_data); mxt_debug(DEBUG_TRACE, "\nReported info block CRC = 0x%6X\n", crc); mxt_debug(DEBUG_TRACE, "Calculated info block CRC = 0x%6X\n\n", calculated_crc); if (crc == calculated_crc) { mxt->info_block_crc = crc; } else { mxt->info_block_crc = 0; printk(KERN_ALERT "maXTouch: Info block CRC invalid!\n"); } if (debug >= DEBUG_VERBOSE) { dev_info(&client->dev, "maXTouch: %d Objects\n", mxt->device_info.num_objs); for (i = 0; i < mxt->device_info.num_objs; i++) { dev_info(&client->dev, "Type:\t\t\t[%d]: %s\n", object_table[i].type, object_type_name[object_table[i].type]); dev_info(&client->dev, "\tAddress:\t0x%04X\n", object_table[i].chip_addr); dev_info(&client->dev, "\tSize:\t\t%d Bytes\n", object_table[i].size); dev_info(&client->dev, "\tInstances:\t%d\n", object_table[i].instances); dev_info(&client->dev, "\tReport Id's:\t%d\n", object_table[i].num_report_ids); } } return 0; err_max_rid: kfree(mxt->last_message); err_msg_alloc: kfree(mxt->rid_map); err_rid_map_alloc: err_object_read: kfree(raw_ib_data); err_ib_alloc: kfree(object_table); err_object_table_alloc: return error; } #if defined(CONFIG_PM) static void mxt_start(struct mxt_data *mxt) { mxt_write_byte(mxt->client, MXT_BASE_ADDR(MXT_TOUCH_MULTITOUCHSCREEN_T9, mxt), 0x83); } static void mxt_stop(struct mxt_data *mxt) { mxt_write_byte(mxt->client, MXT_BASE_ADDR(MXT_TOUCH_MULTITOUCHSCREEN_T9, mxt), 0x0); } static int mxt_suspend(struct i2c_client *client, pm_message_t mesg) { struct mxt_data *mxt = i2c_get_clientdata(client); if (device_may_wakeup(&client->dev)) enable_irq_wake(mxt->irq); else mxt_stop(mxt); return 0; } static int mxt_resume(struct i2c_client *client) { struct mxt_data *mxt = i2c_get_clientdata(client); if (device_may_wakeup(&client->dev)) disable_irq_wake(mxt->irq); else mxt_start(mxt); return 0; } #ifdef CONFIG_HAS_EARLYSUSPEND static void mxt_early_suspend(struct early_suspend *es) { struct mxt_data *mxt; mxt = container_of(es, struct mxt_data, early_suspend); if (mxt_suspend(mxt->client, PMSG_SUSPEND) != 0) dev_err(&mxt->client->dev, "%s: failed\n", __func__); printk(KERN_WARNING "MXT Early Suspended\n"); } static void mxt_early_resume(struct early_suspend *es) { struct mxt_data *mxt; mxt = container_of(es, struct mxt_data, early_suspend); if (mxt_resume(mxt->client) != 0) dev_err(&mxt->client->dev, "%s: failed\n", __func__); printk(KERN_WARNING "MXT Early Resumed\n"); } #endif #else #define mxt_suspend NULL #define mxt_resume NULL #endif static int __devinit mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct mxt_data *mxt; struct mxt_platform_data *pdata; struct input_dev *input; u8 *id_data; int error; mxt_debug(DEBUG_INFO, "mXT224: mxt_probe\n"); if (client == NULL) { pr_debug("maXTouch: client == NULL\n"); return -EINVAL; } else if (client->adapter == NULL) { pr_debug("maXTouch: client->adapter == NULL\n"); return -EINVAL; } else if (&client->dev == NULL) { pr_debug("maXTouch: client->dev == NULL\n"); return -EINVAL; } else if (&client->adapter->dev == NULL) { pr_debug("maXTouch: client->adapter->dev == NULL\n"); return -EINVAL; } else if (id == NULL) { pr_debug("maXTouch: id == NULL\n"); return -EINVAL; } mxt_debug(DEBUG_INFO, "maXTouch driver\n"); mxt_debug(DEBUG_INFO, "\t \"%s\"\n", client->name); mxt_debug(DEBUG_INFO, "\taddr:\t0x%04x\n", client->addr); mxt_debug(DEBUG_INFO, "\tirq:\t%d\n", client->irq); mxt_debug(DEBUG_INFO, "\tflags:\t0x%04x\n", client->flags); mxt_debug(DEBUG_INFO, "\tadapter:\"%s\"\n", client->adapter->name); mxt_debug(DEBUG_INFO, "\tdevice:\t\"%s\"\n", client->dev.init_name); /* Check if the I2C bus supports BYTE transfer */ error = i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE); dev_info(&client->dev, "RRC: i2c_check_functionality = %i\n", error); error = 0xff; /* if (!error) { dev_err(&client->dev, "maXTouch driver\n"); dev_err(&client->dev, "\t \"%s\"\n", client->name); dev_err(&client->dev, "\taddr:\t0x%04x\n", client->addr); dev_err(&client->dev, "\tirq:\t%d\n", client->irq); dev_err(&client->dev, "\tflags:\t0x%04x\n", client->flags); dev_err(&client->dev, "\tadapter:\"%s\"\n", client->adapter->name); dev_err(&client->dev, "\tdevice:\t\"%s\"\n", client->dev.init_name); dev_err(&client->dev, "%s adapter not supported\n", dev_driver_string(&client->adapter->dev)); return -ENODEV; } */ mxt_debug(DEBUG_TRACE, "maXTouch driver functionality OK\n"); /* Allocate structure - we need it to identify device */ mxt = kzalloc(sizeof(struct mxt_data), GFP_KERNEL); if (mxt == NULL) { dev_err(&client->dev, "insufficient memory\n"); error = -ENOMEM; goto err_mxt_alloc; } id_data = kmalloc(MXT_ID_BLOCK_SIZE, GFP_KERNEL); if (id_data == NULL) { dev_err(&client->dev, "insufficient memory\n"); error = -ENOMEM; goto err_id_alloc; } input = input_allocate_device(); if (!input) { dev_err(&client->dev, "error allocating input device\n"); error = -ENOMEM; goto err_input_dev_alloc; } /* Initialize Platform data */ pdata = client->dev.platform_data; if (pdata == NULL) { dev_err(&client->dev, "platform data is required!\n"); error = -EINVAL; goto err_pdata; } if (debug >= DEBUG_TRACE) printk(KERN_INFO "Platform OK: pdata = 0x%08x\n", (unsigned int)pdata); mxt->read_fail_counter = 0; mxt->message_counter = 0; mxt->max_x_val = pdata->max_x; mxt->max_y_val = pdata->max_y; /* Get data that is defined in board specific code. */ mxt->init_hw = pdata->init_platform_hw; mxt->exit_hw = pdata->exit_platform_hw; mxt->read_chg = pdata->read_chg; if (pdata->valid_interrupt != NULL) mxt->valid_interrupt = pdata->valid_interrupt; else mxt->valid_interrupt = mxt_valid_interrupt_dummy; if (mxt->init_hw != NULL) mxt->init_hw(); if (debug >= DEBUG_TRACE) printk(KERN_INFO "maXTouch driver identifying chip\n"); if (mxt_identify(client, mxt, id_data) < 0) { dev_err(&client->dev, "Chip could not be identified\n"); error = -ENODEV; goto err_identify; } /* Chip is valid and active. */ if (debug >= DEBUG_TRACE) printk(KERN_INFO "maXTouch driver allocating input device\n"); mxt->client = client; mxt->input = input; INIT_DELAYED_WORK(&mxt->dwork, mxt_worker); mutex_init(&mxt->debug_mutex); mutex_init(&mxt->msg_mutex); mxt_debug(DEBUG_TRACE, "maXTouch driver creating device name\n"); snprintf(mxt->phys_name, sizeof(mxt->phys_name), "%s/input0", dev_name(&client->dev) ); input->name = "atmel-maxtouch"; input->phys = mxt->phys_name; input->id.bustype = BUS_I2C; input->dev.parent = &client->dev; mxt_debug(DEBUG_INFO, "maXTouch name: \"%s\"\n", input->name); mxt_debug(DEBUG_INFO, "maXTouch phys: \"%s\"\n", input->phys); mxt_debug(DEBUG_INFO, "maXTouch driver setting abs parameters\n"); set_bit(BTN_TOUCH, input->keybit); /* Single touch */ input_set_abs_params(input, ABS_X, 0, mxt->max_x_val, 0, 0); input_set_abs_params(input, ABS_Y, 0, mxt->max_y_val, 0, 0); input_set_abs_params(input, ABS_PRESSURE, 0, MXT_MAX_REPORTED_PRESSURE, 0, 0); input_set_abs_params(input, ABS_TOOL_WIDTH, 0, MXT_MAX_REPORTED_WIDTH, 0, 0); /* Multitouch */ input_set_abs_params(input, ABS_MT_POSITION_X, 0, mxt->max_x_val, 0, 0); input_set_abs_params(input, ABS_MT_POSITION_Y, 0, mxt->max_y_val, 0, 0); input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, MXT_MAX_TOUCH_SIZE, 0, 0); input_set_abs_params(input, ABS_MT_TRACKING_ID, 0, MXT_MAX_NUM_TOUCHES, 0, 0); __set_bit(EV_ABS, input->evbit); __set_bit(EV_SYN, input->evbit); __set_bit(EV_KEY, input->evbit); mxt_debug(DEBUG_TRACE, "maXTouch driver setting client data\n"); i2c_set_clientdata(client, mxt); mxt_debug(DEBUG_TRACE, "maXTouch driver setting drv data\n"); input_set_drvdata(input, mxt); mxt_debug(DEBUG_TRACE, "maXTouch driver input register device\n"); error = input_register_device(mxt->input); if (error < 0) { dev_err(&client->dev, "Failed to register input device\n"); goto err_register_device; } error = mxt_read_object_table(client, mxt, id_data); if (error < 0) goto err_read_ot; /* Create debugfs entries. */ mxt->debug_dir = debugfs_create_dir("maXTouch", NULL); if (mxt->debug_dir == ERR_PTR(-ENODEV)) { /* debugfs is not enabled. */ printk(KERN_WARNING "debugfs not enabled in kernel\n"); } else if (mxt->debug_dir == NULL) { printk(KERN_WARNING "error creating debugfs dir\n"); } else { mxt_debug(DEBUG_TRACE, "created \"maXTouch\" debugfs dir\n"); debugfs_create_file("deltas", S_IRUSR, mxt->debug_dir, mxt, &delta_fops); debugfs_create_file("refs", S_IRUSR, mxt->debug_dir, mxt, &refs_fops); } /* Create character device nodes for reading & writing registers */ mxt->mxt_class = class_create(THIS_MODULE, "maXTouch_memory"); /* 2 numbers; one for memory and one for messages */ error = alloc_chrdev_region(&mxt->dev_num, 0, 2, "maXTouch_memory"); mxt_debug(DEBUG_VERBOSE, "device number %d allocated!\n", MAJOR(mxt->dev_num)); if (error) printk(KERN_WARNING "Error registering device\n"); cdev_init(&mxt->cdev, &mxt_memory_fops); cdev_init(&mxt->cdev_messages, &mxt_message_fops); mxt_debug(DEBUG_VERBOSE, "cdev initialized\n"); mxt->cdev.owner = THIS_MODULE; mxt->cdev_messages.owner = THIS_MODULE; error = cdev_add(&mxt->cdev, mxt->dev_num, 1); if (error) printk(KERN_WARNING "Bad cdev\n"); error = cdev_add(&mxt->cdev_messages, mxt->dev_num + 1, 1); if (error) printk(KERN_WARNING "Bad cdev\n"); mxt_debug(DEBUG_VERBOSE, "cdev added\n"); device_create(mxt->mxt_class, NULL, MKDEV(MAJOR(mxt->dev_num), 0), NULL, "maXTouch"); device_create(mxt->mxt_class, NULL, MKDEV(MAJOR(mxt->dev_num), 1), NULL, "maXTouch_messages"); mxt->msg_buffer_startp = 0; mxt->msg_buffer_endp = 0; /* Allocate the interrupt */ mxt_debug(DEBUG_TRACE, "maXTouch driver allocating interrupt...\n"); mxt->irq = client->irq; mxt->valid_irq_counter = 0; mxt->invalid_irq_counter = 0; mxt->irq_counter = 0; if (mxt->irq) { /* Try to request IRQ with falling edge first. This is * not always supported. If it fails, try with any edge. */ error = request_irq(mxt->irq, mxt_irq_handler, IRQF_TRIGGER_FALLING, client->dev.driver->name, mxt); if (error < 0) { /* TODO: why only 0 works on STK1000? */ error = request_irq(mxt->irq, mxt_irq_handler, 0, client->dev.driver->name, mxt); } if (error < 0) { dev_err(&client->dev, "failed to allocate irq %d\n", mxt->irq); goto err_irq; } } #ifdef CONFIG_HAS_EARLYSUSPEND mxt->early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN + 1; mxt->early_suspend.suspend = mxt_early_suspend; mxt->early_suspend.resume = mxt_early_resume; register_early_suspend(&mxt->early_suspend); #endif if (debug > DEBUG_INFO) dev_info(&client->dev, "touchscreen, irq %d\n", mxt->irq); /* Schedule a worker routine to read any messages that might have * been sent before interrupts were enabled. */ cancel_delayed_work(&mxt->dwork); schedule_delayed_work(&mxt->dwork, 0); kfree(id_data); /* TODO: REMOVE!!!!!!!!!!!!!!!!!!!!!!! REMOVE!!!!!!!!!!!!!!!!!!!!!!! */ mxt_write_byte(mxt->client, MXT_BASE_ADDR(MXT_TOUCH_MULTITOUCHSCREEN_T9, mxt), 15); return 0; err_irq: kfree(mxt->rid_map); kfree(mxt->object_table); kfree(mxt->last_message); err_read_ot: err_register_device: err_identify: err_pdata: input_free_device(input); err_input_dev_alloc: kfree(id_data); err_id_alloc: if (mxt->exit_hw != NULL) mxt->exit_hw(); kfree(mxt); err_mxt_alloc: return error; } static int __devexit mxt_remove(struct i2c_client *client) { struct mxt_data *mxt; mxt = i2c_get_clientdata(client); /* Remove debug dir entries */ debugfs_remove_recursive(mxt->debug_dir); if (mxt != NULL) { if (mxt->exit_hw != NULL) mxt->exit_hw(); if (mxt->irq) free_irq(mxt->irq, mxt); unregister_chrdev_region(mxt->dev_num, 2); device_destroy(mxt->mxt_class, MKDEV(MAJOR(mxt->dev_num), 0)); device_destroy(mxt->mxt_class, MKDEV(MAJOR(mxt->dev_num), 1)); cdev_del(&mxt->cdev); cdev_del(&mxt->cdev_messages); cancel_delayed_work_sync(&mxt->dwork); input_unregister_device(mxt->input); class_destroy(mxt->mxt_class); debugfs_remove(mxt->debug_dir); kfree(mxt->rid_map); kfree(mxt->object_table); kfree(mxt->last_message); } kfree(mxt); i2c_set_clientdata(client, NULL); if (debug >= DEBUG_TRACE) dev_info(&client->dev, "Touchscreen unregistered\n"); return 0; } static const struct i2c_device_id mxt_idtable[] = { {"maXTouch", 0,}, {} }; MODULE_DEVICE_TABLE(i2c, mxt_idtable); static struct i2c_driver mxt_driver = { .driver = { .name = "maXTouch", .owner = THIS_MODULE, }, .id_table = mxt_idtable, .probe = mxt_probe, .remove = __devexit_p(mxt_remove), #if !defined(CONFIG_HAS_EARLYSUSPEND) .suspend = mxt_suspend, .resume = mxt_resume, #endif }; static int __init mxt_init(void) { int err; err = i2c_add_driver(&mxt_driver); if (err) { printk(KERN_WARNING "Adding maXTouch driver failed " "(errno = %d)\n", err); } else { mxt_debug(DEBUG_TRACE, "Successfully added driver %s\n", mxt_driver.driver.name); } return err; } static void __exit mxt_cleanup(void) { i2c_del_driver(&mxt_driver); } module_init(mxt_init); module_exit(mxt_cleanup); MODULE_AUTHOR("Iiro Valkonen"); MODULE_DESCRIPTION("Driver for Atmel maXTouch Touchscreen Controller"); MODULE_LICENSE("GPL");