diff options
Diffstat (limited to 'kernel/drivers/input/touchscreen/atmel_mxt_ts.c')
-rw-r--r-- | kernel/drivers/input/touchscreen/atmel_mxt_ts.c | 2684 |
1 files changed, 2684 insertions, 0 deletions
diff --git a/kernel/drivers/input/touchscreen/atmel_mxt_ts.c b/kernel/drivers/input/touchscreen/atmel_mxt_ts.c new file mode 100644 index 000000000..40b98dda8 --- /dev/null +++ b/kernel/drivers/input/touchscreen/atmel_mxt_ts.c @@ -0,0 +1,2684 @@ +/* + * Atmel maXTouch Touchscreen driver + * + * Copyright (C) 2010 Samsung Electronics Co.Ltd + * Copyright (C) 2011-2014 Atmel Corporation + * Copyright (C) 2012 Google, Inc. + * + * Author: Joonyoung Shim <jy0922.shim@samsung.com> + * + * 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 <linux/acpi.h> +#include <linux/dmi.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/firmware.h> +#include <linux/i2c.h> +#include <linux/i2c/atmel_mxt_ts.h> +#include <linux/input/mt.h> +#include <linux/interrupt.h> +#include <linux/of.h> +#include <linux/slab.h> +#include <asm/unaligned.h> + +/* Version */ +#define MXT_VER_20 20 +#define MXT_VER_21 21 +#define MXT_VER_22 22 + +/* Firmware files */ +#define MXT_FW_NAME "maxtouch.fw" +#define MXT_CFG_NAME "maxtouch.cfg" +#define MXT_CFG_MAGIC "OBP_RAW V1" + +/* 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 +#define MXT_INFO_CHECKSUM_SIZE 3 +#define MXT_MAX_BLOCK_WRITE 256 + +/* 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 +#define MXT_TOUCH_MULTITOUCHSCREEN_T100 100 + +/* MXT_GEN_MESSAGE_T5 object */ +#define MXT_RPTID_NOMSG 0xff + +/* 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) +#define MXT_T6_STATUS_OFL (1 << 6) +#define MXT_T6_STATUS_SIGERR (1 << 5) +#define MXT_T6_STATUS_CAL (1 << 4) +#define MXT_T6_STATUS_CFGERR (1 << 3) +#define MXT_T6_STATUS_COMSERR (1 << 2) + +/* 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_T9_ORIENT 9 +#define MXT_T9_RANGE 18 + +/* MXT_TOUCH_MULTI_T9 status */ +#define MXT_T9_UNGRIP (1 << 0) +#define MXT_T9_SUPPRESS (1 << 1) +#define MXT_T9_AMP (1 << 2) +#define MXT_T9_VECTOR (1 << 3) +#define MXT_T9_MOVE (1 << 4) +#define MXT_T9_RELEASE (1 << 5) +#define MXT_T9_PRESS (1 << 6) +#define MXT_T9_DETECT (1 << 7) + +struct t9_range { + u16 x; + u16 y; +} __packed; + +/* MXT_TOUCH_MULTI_T9 orient */ +#define MXT_T9_ORIENT_SWITCH (1 << 0) + +/* 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 + +/* T100 Multiple Touch Touchscreen */ +#define MXT_T100_CTRL 0 +#define MXT_T100_CFG1 1 +#define MXT_T100_TCHAUX 3 +#define MXT_T100_XRANGE 13 +#define MXT_T100_YRANGE 24 + +#define MXT_T100_CFG_SWITCHXY BIT(5) + +#define MXT_T100_TCHAUX_VECT BIT(0) +#define MXT_T100_TCHAUX_AMPL BIT(1) +#define MXT_T100_TCHAUX_AREA BIT(2) + +#define MXT_T100_DETECT BIT(7) +#define MXT_T100_TYPE_MASK 0x70 + +enum t100_type { + MXT_T100_TYPE_FINGER = 1, + MXT_T100_TYPE_PASSIVE_STYLUS = 2, + MXT_T100_TYPE_HOVERING_FINGER = 4, + MXT_T100_TYPE_GLOVE = 5, + MXT_T100_TYPE_LARGE_TOUCH = 6, +}; + +#define MXT_DISTANCE_ACTIVE_TOUCH 0 +#define MXT_DISTANCE_HOVERING 1 + +#define MXT_TOUCH_MAJOR_DEFAULT 1 +#define MXT_PRESSURE_DEFAULT 1 + +/* 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 + +/* 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; + +/* 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; + u16 mem_size; + u8 t100_aux_ampl; + u8 t100_aux_area; + u8 t100_aux_vect; + u8 max_reportid; + u32 config_crc; + u32 info_crc; + u8 bootloader_addr; + u8 *msg_buf; + u8 t6_status; + bool update_input; + u8 last_message_count; + u8 num_touchids; + u8 multitouch; + + /* Cached parameters from object table */ + u16 T5_address; + u8 T5_msg_size; + u8 T6_reportid; + u16 T6_address; + u16 T7_address; + u8 T9_reportid_min; + u8 T9_reportid_max; + u8 T19_reportid; + u16 T44_address; + u8 T100_reportid_min; + u8 T100_reportid_max; + + /* 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 void mxt_dump_message(struct mxt_data *data, u8 *message) +{ + dev_dbg(&data->client->dev, "message: %*ph\n", + data->T5_msg_size, 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, bool retry) +{ + u8 appmode = data->client->addr; + u8 bootloader; + + switch (appmode) { + case 0x4a: + case 0x4b: + /* Chips after 1664S use different scheme */ + if (retry || data->info.family_id >= 0xa2) { + bootloader = appmode - 0x24; + break; + } + /* Fall through for normal case */ + 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 int mxt_probe_bootloader(struct mxt_data *data, bool alt_address) +{ + struct device *dev = &data->client->dev; + int error; + u8 val; + bool crc_failure; + + error = mxt_lookup_bootloader_address(data, alt_address); + if (error) + return error; + + error = mxt_bootloader_read(data, &val, 1); + if (error) + return error; + + /* Check app crc fail mode */ + crc_failure = (val & ~MXT_BOOT_STATUS_MASK) == MXT_APP_CRC_FAIL; + + dev_err(dev, "Detected bootloader, status:%02X%s\n", + val, crc_failure ? ", APP_CRC_FAIL" : ""); + + 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 val; + } + + 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, + bool wait) +{ + struct device *dev = &data->client->dev; + u8 val; + int ret; + +recheck: + if (wait) { + /* + * 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: + case MXT_APP_CRC_FAIL: + 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_send_bootloader_cmd(struct mxt_data *data, bool unlock) +{ + int ret; + u8 buf[2]; + + if (unlock) { + buf[0] = MXT_UNLOCK_CMD_LSB; + buf[1] = MXT_UNLOCK_CMD_MSB; + } else { + buf[0] = 0x01; + buf[1] = 0x01; + } + + 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_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_warn(&data->client->dev, "Invalid object type T%u\n", type); + return NULL; +} + +static void mxt_proc_t6_messages(struct mxt_data *data, u8 *msg) +{ + struct device *dev = &data->client->dev; + u8 status = msg[1]; + u32 crc = msg[2] | (msg[3] << 8) | (msg[4] << 16); + + complete(&data->crc_completion); + + if (crc != data->config_crc) { + data->config_crc = crc; + dev_dbg(dev, "T6 Config Checksum: 0x%06X\n", crc); + } + + /* Detect reset */ + if (status & MXT_T6_STATUS_RESET) + complete(&data->reset_completion); + + /* Output debug if status has changed */ + if (status != data->t6_status) + dev_dbg(dev, "T6 Status 0x%02X%s%s%s%s%s%s%s\n", + status, + status == 0 ? " OK" : "", + status & MXT_T6_STATUS_RESET ? " RESET" : "", + status & MXT_T6_STATUS_OFL ? " OFL" : "", + status & MXT_T6_STATUS_SIGERR ? " SIGERR" : "", + status & MXT_T6_STATUS_CAL ? " CAL" : "", + status & MXT_T6_STATUS_CFGERR ? " CFGERR" : "", + status & MXT_T6_STATUS_COMSERR ? " COMSERR" : ""); + + /* Save current status */ + data->t6_status = status; +} + +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, u8 *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[1] & (1 << i)); + input_report_key(input, pdata->t19_keymap[i], button); + } +} + +static void mxt_input_sync(struct mxt_data *data) +{ + input_mt_report_pointer_emulation(data->input_dev, + data->pdata->t19_num_keys); + input_sync(data->input_dev); +} + +static void mxt_proc_t9_message(struct mxt_data *data, u8 *message) +{ + struct device *dev = &data->client->dev; + struct input_dev *input_dev = data->input_dev; + int id; + u8 status; + int x; + int y; + int area; + int amplitude; + + id = message[0] - data->T9_reportid_min; + status = message[1]; + x = (message[2] << 4) | ((message[4] >> 4) & 0xf); + y = (message[3] << 4) | ((message[4] & 0xf)); + + /* Handle 10/12 bit switching */ + if (data->max_x < 1024) + x >>= 2; + if (data->max_y < 1024) + y >>= 2; + + area = message[5]; + amplitude = message[6]; + + dev_dbg(dev, + "[%u] %c%c%c%c%c%c%c%c x: %5u y: %5u area: %3u amp: %3u\n", + id, + (status & MXT_T9_DETECT) ? 'D' : '.', + (status & MXT_T9_PRESS) ? 'P' : '.', + (status & MXT_T9_RELEASE) ? 'R' : '.', + (status & MXT_T9_MOVE) ? 'M' : '.', + (status & MXT_T9_VECTOR) ? 'V' : '.', + (status & MXT_T9_AMP) ? 'A' : '.', + (status & MXT_T9_SUPPRESS) ? 'S' : '.', + (status & MXT_T9_UNGRIP) ? 'U' : '.', + x, y, area, amplitude); + + input_mt_slot(input_dev, id); + + if (status & MXT_T9_DETECT) { + /* + * Multiple bits may be set if the host is slow to read + * the status messages, indicating all the events that + * have happened. + */ + if (status & MXT_T9_RELEASE) { + input_mt_report_slot_state(input_dev, + MT_TOOL_FINGER, 0); + mxt_input_sync(data); + } + + /* Touch active */ + input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, 1); + 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, amplitude); + input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, area); + } else { + /* Touch no longer active, close out slot */ + input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, 0); + } + + data->update_input = true; +} + +static void mxt_proc_t100_message(struct mxt_data *data, u8 *message) +{ + struct device *dev = &data->client->dev; + struct input_dev *input_dev = data->input_dev; + int id; + u8 status; + u8 type = 0; + u16 x; + u16 y; + int distance = 0; + int tool = 0; + u8 major = 0; + u8 pressure = 0; + u8 orientation = 0; + + id = message[0] - data->T100_reportid_min - 2; + + /* ignore SCRSTATUS events */ + if (id < 0) + return; + + status = message[1]; + x = get_unaligned_le16(&message[2]); + y = get_unaligned_le16(&message[4]); + + if (status & MXT_T100_DETECT) { + type = (status & MXT_T100_TYPE_MASK) >> 4; + + switch (type) { + case MXT_T100_TYPE_HOVERING_FINGER: + tool = MT_TOOL_FINGER; + distance = MXT_DISTANCE_HOVERING; + + if (data->t100_aux_vect) + orientation = message[data->t100_aux_vect]; + + break; + + case MXT_T100_TYPE_FINGER: + case MXT_T100_TYPE_GLOVE: + tool = MT_TOOL_FINGER; + distance = MXT_DISTANCE_ACTIVE_TOUCH; + + if (data->t100_aux_area) + major = message[data->t100_aux_area]; + + if (data->t100_aux_ampl) + pressure = message[data->t100_aux_ampl]; + + if (data->t100_aux_vect) + orientation = message[data->t100_aux_vect]; + + break; + + case MXT_T100_TYPE_PASSIVE_STYLUS: + tool = MT_TOOL_PEN; + + /* + * Passive stylus is reported with size zero so + * hardcode. + */ + major = MXT_TOUCH_MAJOR_DEFAULT; + + if (data->t100_aux_ampl) + pressure = message[data->t100_aux_ampl]; + + break; + + case MXT_T100_TYPE_LARGE_TOUCH: + /* Ignore suppressed touch */ + break; + + default: + dev_dbg(dev, "Unexpected T100 type\n"); + return; + } + } + + /* + * Values reported should be non-zero if tool is touching the + * device + */ + if (!pressure && type != MXT_T100_TYPE_HOVERING_FINGER) + pressure = MXT_PRESSURE_DEFAULT; + + input_mt_slot(input_dev, id); + + if (status & MXT_T100_DETECT) { + dev_dbg(dev, "[%u] type:%u x:%u y:%u a:%02X p:%02X v:%02X\n", + id, type, x, y, major, pressure, orientation); + + input_mt_report_slot_state(input_dev, tool, 1); + 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_TOUCH_MAJOR, major); + input_report_abs(input_dev, ABS_MT_PRESSURE, pressure); + input_report_abs(input_dev, ABS_MT_DISTANCE, distance); + input_report_abs(input_dev, ABS_MT_ORIENTATION, orientation); + } else { + dev_dbg(dev, "[%u] release\n", id); + + /* close out slot */ + input_mt_report_slot_state(input_dev, 0, 0); + } + + data->update_input = true; +} + +static int mxt_proc_message(struct mxt_data *data, u8 *message) +{ + u8 report_id = message[0]; + + if (report_id == MXT_RPTID_NOMSG) + return 0; + + if (report_id == data->T6_reportid) { + mxt_proc_t6_messages(data, message); + } else if (!data->input_dev) { + /* + * Do not report events if input device + * is not yet registered. + */ + mxt_dump_message(data, message); + } else if (report_id >= data->T9_reportid_min && + report_id <= data->T9_reportid_max) { + mxt_proc_t9_message(data, message); + } else if (report_id >= data->T100_reportid_min && + report_id <= data->T100_reportid_max) { + mxt_proc_t100_message(data, message); + } else if (report_id == data->T19_reportid) { + mxt_input_button(data, message); + data->update_input = true; + } else { + mxt_dump_message(data, message); + } + + return 1; +} + +static int mxt_read_and_process_messages(struct mxt_data *data, u8 count) +{ + struct device *dev = &data->client->dev; + int ret; + int i; + u8 num_valid = 0; + + /* Safety check for msg_buf */ + if (count > data->max_reportid) + return -EINVAL; + + /* Process remaining messages if necessary */ + ret = __mxt_read_reg(data->client, data->T5_address, + data->T5_msg_size * count, data->msg_buf); + if (ret) { + dev_err(dev, "Failed to read %u messages (%d)\n", count, ret); + return ret; + } + + for (i = 0; i < count; i++) { + ret = mxt_proc_message(data, + data->msg_buf + data->T5_msg_size * i); + + if (ret == 1) + num_valid++; + } + + /* return number of messages read */ + return num_valid; +} + +static irqreturn_t mxt_process_messages_t44(struct mxt_data *data) +{ + struct device *dev = &data->client->dev; + int ret; + u8 count, num_left; + + /* Read T44 and T5 together */ + ret = __mxt_read_reg(data->client, data->T44_address, + data->T5_msg_size + 1, data->msg_buf); + if (ret) { + dev_err(dev, "Failed to read T44 and T5 (%d)\n", ret); + return IRQ_NONE; + } + + count = data->msg_buf[0]; + + if (count == 0) { + /* + * This condition is caused by the CHG line being configured + * in Mode 0. It results in unnecessary I2C operations but it + * is benign. + */ + dev_dbg(dev, "Interrupt triggered but zero messages\n"); + return IRQ_NONE; + } else if (count > data->max_reportid) { + dev_err(dev, "T44 count %d exceeded max report id\n", count); + count = data->max_reportid; + } + + /* Process first message */ + ret = mxt_proc_message(data, data->msg_buf + 1); + if (ret < 0) { + dev_warn(dev, "Unexpected invalid message\n"); + return IRQ_NONE; + } + + num_left = count - 1; + + /* Process remaining messages if necessary */ + if (num_left) { + ret = mxt_read_and_process_messages(data, num_left); + if (ret < 0) + goto end; + else if (ret != num_left) + dev_warn(dev, "Unexpected invalid message\n"); + } + +end: + if (data->update_input) { + mxt_input_sync(data); + data->update_input = false; + } + + return IRQ_HANDLED; +} + +static int mxt_process_messages_until_invalid(struct mxt_data *data) +{ + struct device *dev = &data->client->dev; + int count, read; + u8 tries = 2; + + count = data->max_reportid; + + /* Read messages until we force an invalid */ + do { + read = mxt_read_and_process_messages(data, count); + if (read < count) + return 0; + } while (--tries); + + if (data->update_input) { + mxt_input_sync(data); + data->update_input = false; + } + + dev_err(dev, "CHG pin isn't cleared\n"); + return -EBUSY; +} + +static irqreturn_t mxt_process_messages(struct mxt_data *data) +{ + int total_handled, num_handled; + u8 count = data->last_message_count; + + if (count < 1 || count > data->max_reportid) + count = 1; + + /* include final invalid message */ + total_handled = mxt_read_and_process_messages(data, count + 1); + if (total_handled < 0) + return IRQ_NONE; + /* if there were invalid messages, then we are done */ + else if (total_handled <= count) + goto update_count; + + /* keep reading two msgs until one is invalid or reportid limit */ + do { + num_handled = mxt_read_and_process_messages(data, 2); + if (num_handled < 0) + return IRQ_NONE; + + total_handled += num_handled; + + if (num_handled < 2) + break; + } while (total_handled < data->num_touchids); + +update_count: + data->last_message_count = total_handled; + + if (data->update_input) { + mxt_input_sync(data); + data->update_input = false; + } + + 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; + } + + if (!data->object_table) + return IRQ_HANDLED; + + if (data->T44_address) { + return mxt_process_messages_t44(data); + } else { + return mxt_process_messages(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 void mxt_calc_crc24(u32 *crc, u8 firstbyte, u8 secondbyte) +{ + static const unsigned int crcpoly = 0x80001B; + u32 result; + u32 data_word; + + data_word = (secondbyte << 8) | firstbyte; + result = ((*crc << 1) ^ data_word); + + if (result & 0x1000000) + result ^= crcpoly; + + *crc = result; +} + +static u32 mxt_calculate_crc(u8 *base, off_t start_off, off_t end_off) +{ + u32 crc = 0; + u8 *ptr = base + start_off; + u8 *last_val = base + end_off - 1; + + if (end_off < start_off) + return -EINVAL; + + while (ptr < last_val) { + mxt_calc_crc24(&crc, *ptr, *(ptr + 1)); + ptr += 2; + } + + /* if len is odd, fill the last byte with 0 */ + if (ptr == last_val) + mxt_calc_crc24(&crc, *ptr, 0); + + /* Mask to 24-bit */ + crc &= 0x00FFFFFF; + + return crc; +} + +static int mxt_prepare_cfg_mem(struct mxt_data *data, + const struct firmware *cfg, + unsigned int data_pos, + unsigned int cfg_start_ofs, + u8 *config_mem, + size_t config_mem_size) +{ + struct device *dev = &data->client->dev; + struct mxt_object *object; + unsigned int type, instance, size, byte_offset; + int offset; + int ret; + int i; + u16 reg; + u8 val; + + while (data_pos < cfg->size) { + /* Read type, instance, length */ + ret = sscanf(cfg->data + data_pos, "%x %x %x%n", + &type, &instance, &size, &offset); + if (ret == 0) { + /* EOF */ + break; + } else if (ret != 3) { + dev_err(dev, "Bad format: failed to parse object\n"); + return -EINVAL; + } + data_pos += offset; + + object = mxt_get_object(data, type); + if (!object) { + /* Skip object */ + for (i = 0; i < size; i++) { + ret = sscanf(cfg->data + data_pos, "%hhx%n", + &val, &offset); + if (ret != 1) { + dev_err(dev, "Bad format in T%d at %d\n", + type, i); + return -EINVAL; + } + data_pos += offset; + } + continue; + } + + if (size > mxt_obj_size(object)) { + /* + * Either we are in fallback mode due to wrong + * config or config from a later fw version, + * or the file is corrupt or hand-edited. + */ + dev_warn(dev, "Discarding %zu byte(s) in T%u\n", + size - mxt_obj_size(object), type); + } else if (mxt_obj_size(object) > size) { + /* + * If firmware is upgraded, new bytes may be added to + * end of objects. It is generally forward compatible + * to zero these bytes - previous behaviour will be + * retained. However this does invalidate the CRC and + * will force fallback mode until the configuration is + * updated. We warn here but do nothing else - the + * malloc has zeroed the entire configuration. + */ + dev_warn(dev, "Zeroing %zu byte(s) in T%d\n", + mxt_obj_size(object) - size, type); + } + + if (instance >= mxt_obj_instances(object)) { + dev_err(dev, "Object instances exceeded!\n"); + return -EINVAL; + } + + reg = object->start_address + mxt_obj_size(object) * instance; + + for (i = 0; i < size; i++) { + ret = sscanf(cfg->data + data_pos, "%hhx%n", + &val, + &offset); + if (ret != 1) { + dev_err(dev, "Bad format in T%d at %d\n", + type, i); + return -EINVAL; + } + data_pos += offset; + + if (i > mxt_obj_size(object)) + continue; + + byte_offset = reg + i - cfg_start_ofs; + + if (byte_offset >= 0 && byte_offset < config_mem_size) { + *(config_mem + byte_offset) = val; + } else { + dev_err(dev, "Bad object: reg:%d, T%d, ofs=%d\n", + reg, object->type, byte_offset); + return -EINVAL; + } + } + } + + return 0; +} + +static int mxt_upload_cfg_mem(struct mxt_data *data, unsigned int cfg_start, + u8 *config_mem, size_t config_mem_size) +{ + unsigned int byte_offset = 0; + int error; + + /* Write configuration as blocks */ + while (byte_offset < config_mem_size) { + unsigned int size = config_mem_size - byte_offset; + + if (size > MXT_MAX_BLOCK_WRITE) + size = MXT_MAX_BLOCK_WRITE; + + error = __mxt_write_reg(data->client, + cfg_start + byte_offset, + size, config_mem + byte_offset); + if (error) { + dev_err(&data->client->dev, + "Config write error, ret=%d\n", error); + return error; + } + + byte_offset += size; + } + + return 0; +} + +/* + * mxt_update_cfg - download configuration to chip + * + * Atmel Raw Config File Format + * + * The first four lines of the raw config file contain: + * 1) Version + * 2) Chip ID Information (first 7 bytes of device memory) + * 3) Chip Information Block 24-bit CRC Checksum + * 4) Chip Configuration 24-bit CRC Checksum + * + * The rest of the file consists of one line per object instance: + * <TYPE> <INSTANCE> <SIZE> <CONTENTS> + * + * <TYPE> - 2-byte object type as hex + * <INSTANCE> - 2-byte object instance number as hex + * <SIZE> - 2-byte object size as hex + * <CONTENTS> - array of <SIZE> 1-byte hex values + */ +static int mxt_update_cfg(struct mxt_data *data, const struct firmware *cfg) +{ + struct device *dev = &data->client->dev; + struct mxt_info cfg_info; + int ret; + int offset; + int data_pos; + int i; + int cfg_start_ofs; + u32 info_crc, config_crc, calculated_crc; + u8 *config_mem; + size_t config_mem_size; + + mxt_update_crc(data, MXT_COMMAND_REPORTALL, 1); + + if (strncmp(cfg->data, MXT_CFG_MAGIC, strlen(MXT_CFG_MAGIC))) { + dev_err(dev, "Unrecognised config file\n"); + return -EINVAL; + } + + data_pos = strlen(MXT_CFG_MAGIC); + + /* Load information block and check */ + for (i = 0; i < sizeof(struct mxt_info); i++) { + ret = sscanf(cfg->data + data_pos, "%hhx%n", + (unsigned char *)&cfg_info + i, + &offset); + if (ret != 1) { + dev_err(dev, "Bad format\n"); + return -EINVAL; + } + + data_pos += offset; + } + + if (cfg_info.family_id != data->info.family_id) { + dev_err(dev, "Family ID mismatch!\n"); + return -EINVAL; + } + + if (cfg_info.variant_id != data->info.variant_id) { + dev_err(dev, "Variant ID mismatch!\n"); + return -EINVAL; + } + + /* Read CRCs */ + ret = sscanf(cfg->data + data_pos, "%x%n", &info_crc, &offset); + if (ret != 1) { + dev_err(dev, "Bad format: failed to parse Info CRC\n"); + return -EINVAL; + } + data_pos += offset; + + ret = sscanf(cfg->data + data_pos, "%x%n", &config_crc, &offset); + if (ret != 1) { + dev_err(dev, "Bad format: failed to parse Config CRC\n"); + return -EINVAL; + } + data_pos += offset; + + /* + * The Info Block CRC is calculated over mxt_info and the object + * table. If it does not match then we are trying to load the + * configuration from a different chip or firmware version, so + * the configuration CRC is invalid anyway. + */ + if (info_crc == data->info_crc) { + if (config_crc == 0 || data->config_crc == 0) { + dev_info(dev, "CRC zero, attempting to apply config\n"); + } else if (config_crc == data->config_crc) { + dev_dbg(dev, "Config CRC 0x%06X: OK\n", + data->config_crc); + return 0; + } else { + dev_info(dev, "Config CRC 0x%06X: does not match file 0x%06X\n", + data->config_crc, config_crc); + } + } else { + dev_warn(dev, + "Warning: Info CRC error - device=0x%06X file=0x%06X\n", + data->info_crc, info_crc); + } + + /* Malloc memory to store configuration */ + cfg_start_ofs = MXT_OBJECT_START + + data->info.object_num * sizeof(struct mxt_object) + + MXT_INFO_CHECKSUM_SIZE; + config_mem_size = data->mem_size - cfg_start_ofs; + config_mem = kzalloc(config_mem_size, GFP_KERNEL); + if (!config_mem) { + dev_err(dev, "Failed to allocate memory\n"); + return -ENOMEM; + } + + ret = mxt_prepare_cfg_mem(data, cfg, data_pos, cfg_start_ofs, + config_mem, config_mem_size); + if (ret) + goto release_mem; + + /* Calculate crc of the received configs (not the raw config file) */ + if (data->T7_address < cfg_start_ofs) { + dev_err(dev, "Bad T7 address, T7addr = %x, config offset %x\n", + data->T7_address, cfg_start_ofs); + ret = 0; + goto release_mem; + } + + calculated_crc = mxt_calculate_crc(config_mem, + data->T7_address - cfg_start_ofs, + config_mem_size); + + if (config_crc > 0 && config_crc != calculated_crc) + dev_warn(dev, "Config CRC error, calculated=%06X, file=%06X\n", + calculated_crc, config_crc); + + ret = mxt_upload_cfg_mem(data, cfg_start_ofs, + config_mem, config_mem_size); + if (ret) + goto release_mem; + + mxt_update_crc(data, MXT_COMMAND_BACKUPNV, MXT_BACKUP_VALUE); + + ret = mxt_soft_reset(data); + if (ret) + goto release_mem; + + dev_info(dev, "Config successfully updated\n"); + +release_mem: + kfree(config_mem); + return ret; +} + +static int mxt_acquire_irq(struct mxt_data *data) +{ + int error; + + enable_irq(data->irq); + + error = mxt_process_messages_until_invalid(data); + if (error) + return error; + + 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 void mxt_free_input_device(struct mxt_data *data) +{ + if (data->input_dev) { + input_unregister_device(data->input_dev); + data->input_dev = NULL; + } +} + +static void mxt_free_object_table(struct mxt_data *data) +{ + kfree(data->object_table); + data->object_table = NULL; + kfree(data->msg_buf); + data->msg_buf = NULL; + data->T5_address = 0; + data->T5_msg_size = 0; + data->T6_reportid = 0; + data->T7_address = 0; + data->T9_reportid_min = 0; + data->T9_reportid_max = 0; + data->T19_reportid = 0; + data->T44_address = 0; + data->T100_reportid_min = 0; + data->T100_reportid_max = 0; + data->max_reportid = 0; +} + +static int mxt_get_object_table(struct mxt_data *data) +{ + struct i2c_client *client = data->client; + size_t table_size; + struct mxt_object *object_table; + int error; + int i; + u8 reportid; + u16 end_address; + + table_size = data->info.object_num * sizeof(struct mxt_object); + object_table = kzalloc(table_size, GFP_KERNEL); + if (!object_table) { + dev_err(&data->client->dev, "Failed to allocate memory\n"); + return -ENOMEM; + } + + error = __mxt_read_reg(client, MXT_OBJECT_START, table_size, + object_table); + if (error) { + kfree(object_table); + return error; + } + + /* Valid Report IDs start counting from 1 */ + reportid = 1; + data->mem_size = 0; + for (i = 0; i < data->info.object_num; i++) { + struct mxt_object *object = 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_MESSAGE_T5: + if (data->info.family_id == 0x80 && + data->info.version < 0x20) { + /* + * On mXT224 firmware versions prior to V2.0 + * read and discard unused CRC byte otherwise + * DMA reads are misaligned. + */ + data->T5_msg_size = mxt_obj_size(object); + } else { + /* CRC not enabled, so skip last byte */ + data->T5_msg_size = mxt_obj_size(object) - 1; + } + data->T5_address = object->start_address; + break; + case MXT_GEN_COMMAND_T6: + data->T6_reportid = min_id; + data->T6_address = object->start_address; + break; + case MXT_GEN_POWER_T7: + data->T7_address = object->start_address; + break; + case MXT_TOUCH_MULTI_T9: + data->multitouch = MXT_TOUCH_MULTI_T9; + data->T9_reportid_min = min_id; + data->T9_reportid_max = max_id; + data->num_touchids = object->num_report_ids + * mxt_obj_instances(object); + break; + case MXT_SPT_MESSAGECOUNT_T44: + data->T44_address = object->start_address; + break; + case MXT_SPT_GPIOPWM_T19: + data->T19_reportid = min_id; + break; + case MXT_TOUCH_MULTITOUCHSCREEN_T100: + data->multitouch = MXT_TOUCH_MULTITOUCHSCREEN_T100; + data->T100_reportid_min = min_id; + data->T100_reportid_max = max_id; + /* first two report IDs reserved */ + data->num_touchids = object->num_report_ids - 2; + break; + } + + end_address = object->start_address + + mxt_obj_size(object) * mxt_obj_instances(object) - 1; + + if (end_address >= data->mem_size) + data->mem_size = end_address + 1; + } + + /* Store maximum reportid */ + data->max_reportid = reportid; + + /* If T44 exists, T5 position has to be directly after */ + if (data->T44_address && (data->T5_address != data->T44_address + 1)) { + dev_err(&client->dev, "Invalid T44 position\n"); + error = -EINVAL; + goto free_object_table; + } + + data->msg_buf = kcalloc(data->max_reportid, + data->T5_msg_size, GFP_KERNEL); + if (!data->msg_buf) { + dev_err(&client->dev, "Failed to allocate message buffer\n"); + error = -ENOMEM; + goto free_object_table; + } + + data->object_table = object_table; + + return 0; + +free_object_table: + mxt_free_object_table(data); + return error; +} + +static int mxt_read_t9_resolution(struct mxt_data *data) +{ + struct i2c_client *client = data->client; + int error; + struct t9_range range; + unsigned char orient; + struct mxt_object *object; + + object = mxt_get_object(data, MXT_TOUCH_MULTI_T9); + if (!object) + return -EINVAL; + + error = __mxt_read_reg(client, + object->start_address + MXT_T9_RANGE, + sizeof(range), &range); + if (error) + return error; + + le16_to_cpus(&range.x); + le16_to_cpus(&range.y); + + error = __mxt_read_reg(client, + object->start_address + MXT_T9_ORIENT, + 1, &orient); + if (error) + return error; + + /* Handle default values */ + if (range.x == 0) + range.x = 1023; + + if (range.y == 0) + range.y = 1023; + + if (orient & MXT_T9_ORIENT_SWITCH) { + data->max_x = range.y; + data->max_y = range.x; + } else { + data->max_x = range.x; + data->max_y = range.y; + } + + dev_dbg(&client->dev, + "Touchscreen size X%uY%u\n", data->max_x, data->max_y); + + return 0; +} + +static int mxt_read_t100_config(struct mxt_data *data) +{ + struct i2c_client *client = data->client; + int error; + struct mxt_object *object; + u16 range_x, range_y; + u8 cfg, tchaux; + u8 aux; + + object = mxt_get_object(data, MXT_TOUCH_MULTITOUCHSCREEN_T100); + if (!object) + return -EINVAL; + + error = __mxt_read_reg(client, + object->start_address + MXT_T100_XRANGE, + sizeof(range_x), &range_x); + if (error) + return error; + + le16_to_cpus(&range_x); + + error = __mxt_read_reg(client, + object->start_address + MXT_T100_YRANGE, + sizeof(range_y), &range_y); + if (error) + return error; + + le16_to_cpus(&range_y); + + error = __mxt_read_reg(client, + object->start_address + MXT_T100_CFG1, + 1, &cfg); + if (error) + return error; + + error = __mxt_read_reg(client, + object->start_address + MXT_T100_TCHAUX, + 1, &tchaux); + if (error) + return error; + + /* Handle default values */ + if (range_x == 0) + range_x = 1023; + + if (range_y == 0) + range_y = 1023; + + if (cfg & MXT_T100_CFG_SWITCHXY) { + data->max_x = range_y; + data->max_y = range_x; + } else { + data->max_x = range_x; + data->max_y = range_y; + } + + /* allocate aux bytes */ + aux = 6; + + if (tchaux & MXT_T100_TCHAUX_VECT) + data->t100_aux_vect = aux++; + + if (tchaux & MXT_T100_TCHAUX_AMPL) + data->t100_aux_ampl = aux++; + + if (tchaux & MXT_T100_TCHAUX_AREA) + data->t100_aux_area = aux++; + + dev_dbg(&client->dev, + "T100 aux mappings vect:%u ampl:%u area:%u\n", + data->t100_aux_vect, data->t100_aux_ampl, data->t100_aux_area); + + dev_info(&client->dev, + "T100 Touchscreen size X%uY%u\n", data->max_x, data->max_y); + + return 0; +} + +static int mxt_input_open(struct input_dev *dev); +static void mxt_input_close(struct input_dev *dev); + +static void mxt_set_up_as_touchpad(struct input_dev *input_dev, + struct mxt_data *data) +{ + const struct mxt_platform_data *pdata = data->pdata; + int i; + + input_dev->name = "Atmel maXTouch Touchpad"; + + __set_bit(INPUT_PROP_BUTTONPAD, input_dev->propbit); + + 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); + + 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]); +} + +static int mxt_initialize_input_device(struct mxt_data *data) +{ + const struct mxt_platform_data *pdata = data->pdata; + struct device *dev = &data->client->dev; + struct input_dev *input_dev; + int error; + unsigned int num_mt_slots; + unsigned int mt_flags = 0; + + switch (data->multitouch) { + case MXT_TOUCH_MULTI_T9: + num_mt_slots = data->T9_reportid_max - data->T9_reportid_min + 1; + error = mxt_read_t9_resolution(data); + if (error) + dev_warn(dev, "Failed to initialize T9 resolution\n"); + break; + + case MXT_TOUCH_MULTITOUCHSCREEN_T100: + num_mt_slots = data->num_touchids; + error = mxt_read_t100_config(data); + if (error) + dev_warn(dev, "Failed to read T100 config\n"); + break; + + default: + dev_err(dev, "Invalid multitouch object\n"); + return -EINVAL; + } + + input_dev = input_allocate_device(); + if (!input_dev) { + dev_err(dev, "Failed to allocate memory\n"); + return -ENOMEM; + } + + input_dev->name = "Atmel maXTouch Touchscreen"; + input_dev->phys = data->phys; + input_dev->id.bustype = BUS_I2C; + input_dev->dev.parent = dev; + input_dev->open = mxt_input_open; + input_dev->close = mxt_input_close; + + input_set_capability(input_dev, EV_KEY, BTN_TOUCH); + + /* 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); + + if (data->multitouch == MXT_TOUCH_MULTI_T9 || + (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 && + data->t100_aux_ampl)) { + input_set_abs_params(input_dev, ABS_PRESSURE, 0, 255, 0, 0); + } + + /* If device has buttons we assume it is a touchpad */ + if (pdata->t19_num_keys) { + mxt_set_up_as_touchpad(input_dev, data); + mt_flags |= INPUT_MT_POINTER; + } + + /* For multi touch */ + error = input_mt_init_slots(input_dev, num_mt_slots, mt_flags); + if (error) { + dev_err(dev, "Error %d initialising slots\n", error); + goto err_free_mem; + } + + if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100) { + input_set_abs_params(input_dev, ABS_MT_TOOL_TYPE, + 0, MT_TOOL_MAX, 0, 0); + input_set_abs_params(input_dev, ABS_MT_DISTANCE, + MXT_DISTANCE_ACTIVE_TOUCH, + MXT_DISTANCE_HOVERING, + 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); + + if (data->multitouch == MXT_TOUCH_MULTI_T9 || + (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 && + data->t100_aux_area)) { + input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, + 0, MXT_MAX_AREA, 0, 0); + } + + if (data->multitouch == MXT_TOUCH_MULTI_T9 || + (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 && + data->t100_aux_ampl)) { + input_set_abs_params(input_dev, ABS_MT_PRESSURE, + 0, 255, 0, 0); + } + + if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 && + data->t100_aux_vect) { + input_set_abs_params(input_dev, ABS_MT_ORIENTATION, + 0, 255, 0, 0); + } + + if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 && + data->t100_aux_ampl) { + input_set_abs_params(input_dev, ABS_MT_PRESSURE, + 0, 255, 0, 0); + } + + if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 && + data->t100_aux_vect) { + input_set_abs_params(input_dev, ABS_MT_ORIENTATION, + 0, 255, 0, 0); + } + + input_set_drvdata(input_dev, data); + + error = input_register_device(input_dev); + if (error) { + dev_err(dev, "Error %d registering input device\n", error); + goto err_free_mem; + } + + data->input_dev = input_dev; + + return 0; + +err_free_mem: + input_free_device(input_dev); + return error; +} + +static int mxt_configure_objects(struct mxt_data *data, + const struct firmware *cfg); + +static void mxt_config_cb(const struct firmware *cfg, void *ctx) +{ + mxt_configure_objects(ctx, cfg); + release_firmware(cfg); +} + +static int mxt_initialize(struct mxt_data *data) +{ + struct i2c_client *client = data->client; + int recovery_attempts = 0; + int error; + + while (1) { + error = mxt_get_info(data); + if (!error) + break; + + /* Check bootloader state */ + error = mxt_probe_bootloader(data, false); + if (error) { + dev_info(&client->dev, "Trying alternate bootloader address\n"); + error = mxt_probe_bootloader(data, true); + if (error) { + /* Chip is not in appmode or bootloader mode */ + return error; + } + } + + /* OK, we are in bootloader, see if we can recover */ + if (++recovery_attempts > 1) { + dev_err(&client->dev, "Could not recover from bootloader mode\n"); + /* + * We can reflash from this state, so do not + * abort initialization. + */ + data->in_bootloader = true; + return 0; + } + + /* Attempt to exit bootloader into app mode */ + mxt_send_bootloader_cmd(data, false); + msleep(MXT_FW_RESET_TIME); + } + + /* Get object table information */ + error = mxt_get_object_table(data); + if (error) { + dev_err(&client->dev, "Error %d reading object table\n", error); + return error; + } + + error = mxt_acquire_irq(data); + if (error) + goto err_free_object_table; + + error = request_firmware_nowait(THIS_MODULE, true, MXT_CFG_NAME, + &client->dev, GFP_KERNEL, data, + mxt_config_cb); + if (error) { + dev_err(&client->dev, "Failed to invoke firmware loader: %d\n", + error); + goto err_free_object_table; + } + + return 0; + +err_free_object_table: + mxt_free_object_table(data); + return error; +} + +static int mxt_configure_objects(struct mxt_data *data, + const struct firmware *cfg) +{ + struct device *dev = &data->client->dev; + struct mxt_info *info = &data->info; + int error; + + if (cfg) { + error = mxt_update_cfg(data, cfg); + if (error) + dev_warn(dev, "Error %d updating config\n", error); + } + + if (data->multitouch) { + error = mxt_initialize_input_device(data); + if (error) + return error; + } else { + dev_warn(dev, "No touch object detected\n"); + } + + dev_info(dev, + "Family: %u Variant: %u Firmware V%u.%u.%02X Objects: %u\n", + info->family_id, info->variant_id, info->version >> 4, + info->version & 0xf, info->build, info->object_num); + + return 0; +} + +/* 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_check_firmware_format(struct device *dev, + const struct firmware *fw) +{ + unsigned int pos = 0; + char c; + + while (pos < fw->size) { + c = *(fw->data + pos); + + if (c < '0' || (c > '9' && c < 'A') || c > 'F') + return 0; + + pos++; + } + + /* + * To convert file try: + * xxd -r -p mXTXXX__APP_VX-X-XX.enc > maxtouch.fw + */ + dev_err(dev, "Aborting: firmware file must be in binary format\n"); + + return -EINVAL; +} + +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; + unsigned int frame = 0; + int ret; + + ret = request_firmware(&fw, fn, dev); + if (ret) { + dev_err(dev, "Unable to open firmware %s\n", fn); + return ret; + } + + /* Check for incorrect enc file */ + ret = mxt_check_firmware_format(dev, fw); + if (ret) + goto release_firmware; + + if (!data->in_bootloader) { + /* 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); + + /* Do not need to scan since we know family ID */ + ret = mxt_lookup_bootloader_address(data, 0); + if (ret) + goto release_firmware; + + mxt_free_input_device(data); + mxt_free_object_table(data); + } else { + enable_irq(data->irq); + } + + reinit_completion(&data->bl_completion); + + ret = mxt_check_bootloader(data, MXT_WAITING_BOOTLOAD_CMD, false); + if (ret) { + /* Bootloader may still be unlocked from previous attempt */ + ret = mxt_check_bootloader(data, MXT_WAITING_FRAME_DATA, false); + if (ret) + goto disable_irq; + } else { + dev_info(dev, "Unlocking bootloader\n"); + + /* Unlock bootloader */ + ret = mxt_send_bootloader_cmd(data, true); + if (ret) + goto disable_irq; + } + + while (pos < fw->size) { + ret = mxt_check_bootloader(data, MXT_WAITING_FRAME_DATA, true); + 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, true); + 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; + frame++; + } + + if (frame % 50 == 0) + dev_dbg(dev, "Sent %d frames, %d/%zd bytes\n", + frame, pos, fw->size); + } + + /* Wait for flash. */ + ret = mxt_wait_for_completion(data, &data->bl_completion, + MXT_FW_RESET_TIME); + if (ret) + goto disable_irq; + + dev_dbg(dev, "Sent %d frames, %d bytes\n", frame, pos); + + /* + * 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"); + + error = mxt_initialize(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, data->multitouch, MXT_TOUCH_CTRL, 0x83); +} + +static void mxt_stop(struct mxt_data *data) +{ + /* Touch disable */ + mxt_write_object(data, data->multitouch, 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); +} + +#ifdef CONFIG_OF +static const struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client) +{ + struct mxt_platform_data *pdata; + u32 *keymap; + u32 keycode; + int proplen, i, ret; + + if (!client->dev.of_node) + return ERR_PTR(-ENOENT); + + pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return ERR_PTR(-ENOMEM); + + if (of_find_property(client->dev.of_node, "linux,gpio-keymap", + &proplen)) { + pdata->t19_num_keys = proplen / sizeof(u32); + + keymap = devm_kzalloc(&client->dev, + pdata->t19_num_keys * sizeof(keymap[0]), + GFP_KERNEL); + if (!keymap) + return ERR_PTR(-ENOMEM); + + for (i = 0; i < pdata->t19_num_keys; i++) { + ret = of_property_read_u32_index(client->dev.of_node, + "linux,gpio-keymap", i, &keycode); + if (ret) + keycode = KEY_RESERVED; + + keymap[i] = keycode; + } + + pdata->t19_keymap = keymap; + } + + return pdata; +} +#else +static const struct mxt_platform_data *mxt_parse_dt(struct i2c_client *client) +{ + return ERR_PTR(-ENOENT); +} +#endif + +#ifdef CONFIG_ACPI + +struct mxt_acpi_platform_data { + const char *hid; + struct mxt_platform_data pdata; +}; + +static unsigned int samus_touchpad_buttons[] = { + KEY_RESERVED, + KEY_RESERVED, + KEY_RESERVED, + BTN_LEFT +}; + +static struct mxt_acpi_platform_data samus_platform_data[] = { + { + /* Touchpad */ + .hid = "ATML0000", + .pdata = { + .t19_num_keys = ARRAY_SIZE(samus_touchpad_buttons), + .t19_keymap = samus_touchpad_buttons, + }, + }, + { + /* Touchscreen */ + .hid = "ATML0001", + }, + { } +}; + +static const struct dmi_system_id mxt_dmi_table[] = { + { + /* 2015 Google Pixel */ + .ident = "Chromebook Pixel 2", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"), + DMI_MATCH(DMI_PRODUCT_NAME, "Samus"), + }, + .driver_data = samus_platform_data, + }, + { } +}; + +static const struct mxt_platform_data *mxt_parse_acpi(struct i2c_client *client) +{ + struct acpi_device *adev; + const struct dmi_system_id *system_id; + const struct mxt_acpi_platform_data *acpi_pdata; + + /* + * Ignore ACPI devices representing bootloader mode. + * + * This is a bit of a hack: Google Chromebook BIOS creates ACPI + * devices for both application and bootloader modes, but we are + * interested in application mode only (if device is in bootloader + * mode we'll end up switching into application anyway). So far + * application mode addresses were all above 0x40, so we'll use it + * as a threshold. + */ + if (client->addr < 0x40) + return ERR_PTR(-ENXIO); + + adev = ACPI_COMPANION(&client->dev); + if (!adev) + return ERR_PTR(-ENOENT); + + system_id = dmi_first_match(mxt_dmi_table); + if (!system_id) + return ERR_PTR(-ENOENT); + + acpi_pdata = system_id->driver_data; + if (!acpi_pdata) + return ERR_PTR(-ENOENT); + + while (acpi_pdata->hid) { + if (!strcmp(acpi_device_hid(adev), acpi_pdata->hid)) + return &acpi_pdata->pdata; + + acpi_pdata++; + } + + return ERR_PTR(-ENOENT); +} +#else +static const struct mxt_platform_data *mxt_parse_acpi(struct i2c_client *client) +{ + return ERR_PTR(-ENOENT); +} +#endif + +static const struct mxt_platform_data * +mxt_get_platform_data(struct i2c_client *client) +{ + const struct mxt_platform_data *pdata; + + pdata = dev_get_platdata(&client->dev); + if (pdata) + return pdata; + + pdata = mxt_parse_dt(client); + if (!IS_ERR(pdata) || PTR_ERR(pdata) != -ENOENT) + return pdata; + + pdata = mxt_parse_acpi(client); + if (!IS_ERR(pdata) || PTR_ERR(pdata) != -ENOENT) + return pdata; + + dev_err(&client->dev, "No platform data specified\n"); + return ERR_PTR(-EINVAL); +} + +static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) +{ + struct mxt_data *data; + const struct mxt_platform_data *pdata; + int error; + + pdata = mxt_get_platform_data(client); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + + data = kzalloc(sizeof(struct mxt_data), GFP_KERNEL); + if (!data) { + dev_err(&client->dev, "Failed to allocate memory\n"); + return -ENOMEM; + } + + snprintf(data->phys, sizeof(data->phys), "i2c-%u-%04x/input0", + client->adapter->nr, client->addr); + + data->client = client; + data->pdata = pdata; + data->irq = client->irq; + i2c_set_clientdata(client, data); + + init_completion(&data->bl_completion); + init_completion(&data->reset_completion); + init_completion(&data->crc_completion); + + 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_mem; + } + + disable_irq(client->irq); + + error = mxt_initialize(data); + if (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_free_object; + } + + return 0; + +err_free_object: + mxt_free_input_device(data); + mxt_free_object_table(data); +err_free_irq: + free_irq(client->irq, data); +err_free_mem: + 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); + mxt_free_input_device(data); + mxt_free_object_table(data); + kfree(data); + + return 0; +} + +static int __maybe_unused 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 __maybe_unused 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; +} + +static SIMPLE_DEV_PM_OPS(mxt_pm_ops, mxt_suspend, mxt_resume); + +static const struct of_device_id mxt_of_match[] = { + { .compatible = "atmel,maxtouch", }, + {}, +}; +MODULE_DEVICE_TABLE(of, mxt_of_match); + +#ifdef CONFIG_ACPI +static const struct acpi_device_id mxt_acpi_id[] = { + { "ATML0000", 0 }, /* Touchpad */ + { "ATML0001", 0 }, /* Touchscreen */ + { } +}; +MODULE_DEVICE_TABLE(acpi, mxt_acpi_id); +#endif + +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, + .of_match_table = of_match_ptr(mxt_of_match), + .acpi_match_table = ACPI_PTR(mxt_acpi_id), + .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 <jy0922.shim@samsung.com>"); +MODULE_DESCRIPTION("Atmel maXTouch Touchscreen driver"); +MODULE_LICENSE("GPL"); |