| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Copyright (C) 2012 Simon Budig, <simon.budig@kernelconcepts.de> |
| * Daniel Wagener <daniel.wagener@kernelconcepts.de> (M09 firmware support) |
| * Lothar Waßmann <LW@KARO-electronics.de> (DT support) |
| */ |
| |
| /* |
| * This is a driver for the EDT "Polytouch" family of touch controllers |
| * based on the FocalTech FT5x06 line of chips. |
| * |
| * Development of this driver has been sponsored by Glyn: |
| * http://www.glyn.com/Products/Displays |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/ratelimit.h> |
| #include <linux/irq.h> |
| #include <linux/interrupt.h> |
| #include <linux/input.h> |
| #include <linux/i2c.h> |
| #include <linux/kernel.h> |
| #include <linux/uaccess.h> |
| #include <linux/delay.h> |
| #include <linux/debugfs.h> |
| #include <linux/slab.h> |
| #include <linux/gpio/consumer.h> |
| #include <linux/input/mt.h> |
| #include <linux/input/touchscreen.h> |
| |
| #define WORK_REGISTER_THRESHOLD 0x00 |
| #define WORK_REGISTER_REPORT_RATE 0x08 |
| #define WORK_REGISTER_GAIN 0x30 |
| #define WORK_REGISTER_OFFSET 0x31 |
| #define WORK_REGISTER_NUM_X 0x33 |
| #define WORK_REGISTER_NUM_Y 0x34 |
| |
| #define M09_REGISTER_THRESHOLD 0x80 |
| #define M09_REGISTER_GAIN 0x92 |
| #define M09_REGISTER_OFFSET 0x93 |
| #define M09_REGISTER_NUM_X 0x94 |
| #define M09_REGISTER_NUM_Y 0x95 |
| |
| #define EV_REGISTER_THRESHOLD 0x40 |
| #define EV_REGISTER_GAIN 0x41 |
| #define EV_REGISTER_OFFSET_Y 0x45 |
| #define EV_REGISTER_OFFSET_X 0x46 |
| |
| #define NO_REGISTER 0xff |
| |
| #define WORK_REGISTER_OPMODE 0x3c |
| #define FACTORY_REGISTER_OPMODE 0x01 |
| |
| #define TOUCH_EVENT_DOWN 0x00 |
| #define TOUCH_EVENT_UP 0x01 |
| #define TOUCH_EVENT_ON 0x02 |
| #define TOUCH_EVENT_RESERVED 0x03 |
| |
| #define EDT_NAME_LEN 23 |
| #define EDT_SWITCH_MODE_RETRIES 10 |
| #define EDT_SWITCH_MODE_DELAY 5 /* msec */ |
| #define EDT_RAW_DATA_RETRIES 100 |
| #define EDT_RAW_DATA_DELAY 1000 /* usec */ |
| |
| enum edt_ver { |
| EDT_M06, |
| EDT_M09, |
| EDT_M12, |
| EV_FT, |
| GENERIC_FT, |
| }; |
| |
| struct edt_reg_addr { |
| int reg_threshold; |
| int reg_report_rate; |
| int reg_gain; |
| int reg_offset; |
| int reg_offset_x; |
| int reg_offset_y; |
| int reg_num_x; |
| int reg_num_y; |
| }; |
| |
| struct edt_ft5x06_ts_data { |
| struct i2c_client *client; |
| struct input_dev *input; |
| struct touchscreen_properties prop; |
| u16 num_x; |
| u16 num_y; |
| |
| struct gpio_desc *reset_gpio; |
| struct gpio_desc *wake_gpio; |
| |
| #if defined(CONFIG_DEBUG_FS) |
| struct dentry *debug_dir; |
| u8 *raw_buffer; |
| size_t raw_bufsize; |
| #endif |
| |
| struct mutex mutex; |
| bool factory_mode; |
| int threshold; |
| int gain; |
| int offset; |
| int offset_x; |
| int offset_y; |
| int report_rate; |
| int max_support_points; |
| |
| char name[EDT_NAME_LEN]; |
| |
| struct edt_reg_addr reg_addr; |
| enum edt_ver version; |
| }; |
| |
| struct edt_i2c_chip_data { |
| int max_support_points; |
| }; |
| |
| static int edt_ft5x06_ts_readwrite(struct i2c_client *client, |
| u16 wr_len, u8 *wr_buf, |
| u16 rd_len, u8 *rd_buf) |
| { |
| struct i2c_msg wrmsg[2]; |
| int i = 0; |
| int ret; |
| |
| if (wr_len) { |
| wrmsg[i].addr = client->addr; |
| wrmsg[i].flags = 0; |
| wrmsg[i].len = wr_len; |
| wrmsg[i].buf = wr_buf; |
| i++; |
| } |
| if (rd_len) { |
| wrmsg[i].addr = client->addr; |
| wrmsg[i].flags = I2C_M_RD; |
| wrmsg[i].len = rd_len; |
| wrmsg[i].buf = rd_buf; |
| i++; |
| } |
| |
| ret = i2c_transfer(client->adapter, wrmsg, i); |
| if (ret < 0) |
| return ret; |
| if (ret != i) |
| return -EIO; |
| |
| return 0; |
| } |
| |
| static bool edt_ft5x06_ts_check_crc(struct edt_ft5x06_ts_data *tsdata, |
| u8 *buf, int buflen) |
| { |
| int i; |
| u8 crc = 0; |
| |
| for (i = 0; i < buflen - 1; i++) |
| crc ^= buf[i]; |
| |
| if (crc != buf[buflen-1]) { |
| dev_err_ratelimited(&tsdata->client->dev, |
| "crc error: 0x%02x expected, got 0x%02x\n", |
| crc, buf[buflen-1]); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| static irqreturn_t edt_ft5x06_ts_isr(int irq, void *dev_id) |
| { |
| struct edt_ft5x06_ts_data *tsdata = dev_id; |
| struct device *dev = &tsdata->client->dev; |
| u8 cmd; |
| u8 rdbuf[63]; |
| int i, type, x, y, id; |
| int offset, tplen, datalen, crclen; |
| int error; |
| |
| switch (tsdata->version) { |
| case EDT_M06: |
| cmd = 0xf9; /* tell the controller to send touch data */ |
| offset = 5; /* where the actual touch data starts */ |
| tplen = 4; /* data comes in so called frames */ |
| crclen = 1; /* length of the crc data */ |
| break; |
| |
| case EDT_M09: |
| case EDT_M12: |
| case EV_FT: |
| case GENERIC_FT: |
| cmd = 0x0; |
| offset = 3; |
| tplen = 6; |
| crclen = 0; |
| break; |
| |
| default: |
| goto out; |
| } |
| |
| memset(rdbuf, 0, sizeof(rdbuf)); |
| datalen = tplen * tsdata->max_support_points + offset + crclen; |
| |
| error = edt_ft5x06_ts_readwrite(tsdata->client, |
| sizeof(cmd), &cmd, |
| datalen, rdbuf); |
| if (error) { |
| dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n", |
| error); |
| goto out; |
| } |
| |
| /* M09/M12 does not send header or CRC */ |
| if (tsdata->version == EDT_M06) { |
| if (rdbuf[0] != 0xaa || rdbuf[1] != 0xaa || |
| rdbuf[2] != datalen) { |
| dev_err_ratelimited(dev, |
| "Unexpected header: %02x%02x%02x!\n", |
| rdbuf[0], rdbuf[1], rdbuf[2]); |
| goto out; |
| } |
| |
| if (!edt_ft5x06_ts_check_crc(tsdata, rdbuf, datalen)) |
| goto out; |
| } |
| |
| for (i = 0; i < tsdata->max_support_points; i++) { |
| u8 *buf = &rdbuf[i * tplen + offset]; |
| bool down; |
| |
| type = buf[0] >> 6; |
| /* ignore Reserved events */ |
| if (type == TOUCH_EVENT_RESERVED) |
| continue; |
| |
| /* M06 sometimes sends bogus coordinates in TOUCH_DOWN */ |
| if (tsdata->version == EDT_M06 && type == TOUCH_EVENT_DOWN) |
| continue; |
| |
| x = ((buf[0] << 8) | buf[1]) & 0x0fff; |
| y = ((buf[2] << 8) | buf[3]) & 0x0fff; |
| /* The FT5x26 send the y coordinate first */ |
| if (tsdata->version == EV_FT) |
| swap(x, y); |
| |
| id = (buf[2] >> 4) & 0x0f; |
| down = type != TOUCH_EVENT_UP; |
| |
| input_mt_slot(tsdata->input, id); |
| input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER, down); |
| |
| if (!down) |
| continue; |
| |
| touchscreen_report_pos(tsdata->input, &tsdata->prop, x, y, |
| true); |
| } |
| |
| input_mt_report_pointer_emulation(tsdata->input, true); |
| input_sync(tsdata->input); |
| |
| out: |
| return IRQ_HANDLED; |
| } |
| |
| static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata, |
| u8 addr, u8 value) |
| { |
| u8 wrbuf[4]; |
| |
| switch (tsdata->version) { |
| case EDT_M06: |
| wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc; |
| wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f; |
| wrbuf[2] = value; |
| wrbuf[3] = wrbuf[0] ^ wrbuf[1] ^ wrbuf[2]; |
| return edt_ft5x06_ts_readwrite(tsdata->client, 4, |
| wrbuf, 0, NULL); |
| /* fallthrough */ |
| case EDT_M09: |
| case EDT_M12: |
| case EV_FT: |
| case GENERIC_FT: |
| wrbuf[0] = addr; |
| wrbuf[1] = value; |
| |
| return edt_ft5x06_ts_readwrite(tsdata->client, 2, |
| wrbuf, 0, NULL); |
| |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static int edt_ft5x06_register_read(struct edt_ft5x06_ts_data *tsdata, |
| u8 addr) |
| { |
| u8 wrbuf[2], rdbuf[2]; |
| int error; |
| |
| switch (tsdata->version) { |
| case EDT_M06: |
| wrbuf[0] = tsdata->factory_mode ? 0xf3 : 0xfc; |
| wrbuf[1] = tsdata->factory_mode ? addr & 0x7f : addr & 0x3f; |
| wrbuf[1] |= tsdata->factory_mode ? 0x80 : 0x40; |
| |
| error = edt_ft5x06_ts_readwrite(tsdata->client, 2, wrbuf, 2, |
| rdbuf); |
| if (error) |
| return error; |
| |
| if ((wrbuf[0] ^ wrbuf[1] ^ rdbuf[0]) != rdbuf[1]) { |
| dev_err(&tsdata->client->dev, |
| "crc error: 0x%02x expected, got 0x%02x\n", |
| wrbuf[0] ^ wrbuf[1] ^ rdbuf[0], |
| rdbuf[1]); |
| return -EIO; |
| } |
| break; |
| |
| /* fallthrough */ |
| case EDT_M09: |
| case EDT_M12: |
| case EV_FT: |
| case GENERIC_FT: |
| wrbuf[0] = addr; |
| error = edt_ft5x06_ts_readwrite(tsdata->client, 1, |
| wrbuf, 1, rdbuf); |
| if (error) |
| return error; |
| break; |
| |
| default: |
| return -EINVAL; |
| } |
| |
| return rdbuf[0]; |
| } |
| |
| struct edt_ft5x06_attribute { |
| struct device_attribute dattr; |
| size_t field_offset; |
| u8 limit_low; |
| u8 limit_high; |
| u8 addr_m06; |
| u8 addr_m09; |
| u8 addr_ev; |
| }; |
| |
| #define EDT_ATTR(_field, _mode, _addr_m06, _addr_m09, _addr_ev, \ |
| _limit_low, _limit_high) \ |
| struct edt_ft5x06_attribute edt_ft5x06_attr_##_field = { \ |
| .dattr = __ATTR(_field, _mode, \ |
| edt_ft5x06_setting_show, \ |
| edt_ft5x06_setting_store), \ |
| .field_offset = offsetof(struct edt_ft5x06_ts_data, _field), \ |
| .addr_m06 = _addr_m06, \ |
| .addr_m09 = _addr_m09, \ |
| .addr_ev = _addr_ev, \ |
| .limit_low = _limit_low, \ |
| .limit_high = _limit_high, \ |
| } |
| |
| static ssize_t edt_ft5x06_setting_show(struct device *dev, |
| struct device_attribute *dattr, |
| char *buf) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client); |
| struct edt_ft5x06_attribute *attr = |
| container_of(dattr, struct edt_ft5x06_attribute, dattr); |
| u8 *field = (u8 *)tsdata + attr->field_offset; |
| int val; |
| size_t count = 0; |
| int error = 0; |
| u8 addr; |
| |
| mutex_lock(&tsdata->mutex); |
| |
| if (tsdata->factory_mode) { |
| error = -EIO; |
| goto out; |
| } |
| |
| switch (tsdata->version) { |
| case EDT_M06: |
| addr = attr->addr_m06; |
| break; |
| |
| case EDT_M09: |
| case EDT_M12: |
| case GENERIC_FT: |
| addr = attr->addr_m09; |
| break; |
| |
| case EV_FT: |
| addr = attr->addr_ev; |
| break; |
| |
| default: |
| error = -ENODEV; |
| goto out; |
| } |
| |
| if (addr != NO_REGISTER) { |
| val = edt_ft5x06_register_read(tsdata, addr); |
| if (val < 0) { |
| error = val; |
| dev_err(&tsdata->client->dev, |
| "Failed to fetch attribute %s, error %d\n", |
| dattr->attr.name, error); |
| goto out; |
| } |
| } else { |
| val = *field; |
| } |
| |
| if (val != *field) { |
| dev_warn(&tsdata->client->dev, |
| "%s: read (%d) and stored value (%d) differ\n", |
| dattr->attr.name, val, *field); |
| *field = val; |
| } |
| |
| count = scnprintf(buf, PAGE_SIZE, "%d\n", val); |
| out: |
| mutex_unlock(&tsdata->mutex); |
| return error ?: count; |
| } |
| |
| static ssize_t edt_ft5x06_setting_store(struct device *dev, |
| struct device_attribute *dattr, |
| const char *buf, size_t count) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client); |
| struct edt_ft5x06_attribute *attr = |
| container_of(dattr, struct edt_ft5x06_attribute, dattr); |
| u8 *field = (u8 *)tsdata + attr->field_offset; |
| unsigned int val; |
| int error; |
| u8 addr; |
| |
| mutex_lock(&tsdata->mutex); |
| |
| if (tsdata->factory_mode) { |
| error = -EIO; |
| goto out; |
| } |
| |
| error = kstrtouint(buf, 0, &val); |
| if (error) |
| goto out; |
| |
| if (val < attr->limit_low || val > attr->limit_high) { |
| error = -ERANGE; |
| goto out; |
| } |
| |
| switch (tsdata->version) { |
| case EDT_M06: |
| addr = attr->addr_m06; |
| break; |
| |
| case EDT_M09: |
| case EDT_M12: |
| case GENERIC_FT: |
| addr = attr->addr_m09; |
| break; |
| |
| case EV_FT: |
| addr = attr->addr_ev; |
| break; |
| |
| default: |
| error = -ENODEV; |
| goto out; |
| } |
| |
| if (addr != NO_REGISTER) { |
| error = edt_ft5x06_register_write(tsdata, addr, val); |
| if (error) { |
| dev_err(&tsdata->client->dev, |
| "Failed to update attribute %s, error: %d\n", |
| dattr->attr.name, error); |
| goto out; |
| } |
| } |
| *field = val; |
| |
| out: |
| mutex_unlock(&tsdata->mutex); |
| return error ?: count; |
| } |
| |
| /* m06, m09: range 0-31, m12: range 0-5 */ |
| static EDT_ATTR(gain, S_IWUSR | S_IRUGO, WORK_REGISTER_GAIN, |
| M09_REGISTER_GAIN, EV_REGISTER_GAIN, 0, 31); |
| /* m06, m09: range 0-31, m12: range 0-16 */ |
| static EDT_ATTR(offset, S_IWUSR | S_IRUGO, WORK_REGISTER_OFFSET, |
| M09_REGISTER_OFFSET, NO_REGISTER, 0, 31); |
| /* m06, m09, m12: no supported, ev_ft: range 0-80 */ |
| static EDT_ATTR(offset_x, S_IWUSR | S_IRUGO, NO_REGISTER, NO_REGISTER, |
| EV_REGISTER_OFFSET_X, 0, 80); |
| /* m06, m09, m12: no supported, ev_ft: range 0-80 */ |
| static EDT_ATTR(offset_y, S_IWUSR | S_IRUGO, NO_REGISTER, NO_REGISTER, |
| EV_REGISTER_OFFSET_Y, 0, 80); |
| /* m06: range 20 to 80, m09: range 0 to 30, m12: range 1 to 255... */ |
| static EDT_ATTR(threshold, S_IWUSR | S_IRUGO, WORK_REGISTER_THRESHOLD, |
| M09_REGISTER_THRESHOLD, EV_REGISTER_THRESHOLD, 0, 255); |
| /* m06: range 3 to 14, m12: (0x64: 100Hz) */ |
| static EDT_ATTR(report_rate, S_IWUSR | S_IRUGO, WORK_REGISTER_REPORT_RATE, |
| NO_REGISTER, NO_REGISTER, 0, 255); |
| |
| static struct attribute *edt_ft5x06_attrs[] = { |
| &edt_ft5x06_attr_gain.dattr.attr, |
| &edt_ft5x06_attr_offset.dattr.attr, |
| &edt_ft5x06_attr_offset_x.dattr.attr, |
| &edt_ft5x06_attr_offset_y.dattr.attr, |
| &edt_ft5x06_attr_threshold.dattr.attr, |
| &edt_ft5x06_attr_report_rate.dattr.attr, |
| NULL |
| }; |
| |
| static const struct attribute_group edt_ft5x06_attr_group = { |
| .attrs = edt_ft5x06_attrs, |
| }; |
| |
| #ifdef CONFIG_DEBUG_FS |
| static int edt_ft5x06_factory_mode(struct edt_ft5x06_ts_data *tsdata) |
| { |
| struct i2c_client *client = tsdata->client; |
| int retries = EDT_SWITCH_MODE_RETRIES; |
| int ret; |
| int error; |
| |
| if (tsdata->version != EDT_M06) { |
| dev_err(&client->dev, |
| "No factory mode support for non-M06 devices\n"); |
| return -EINVAL; |
| } |
| |
| disable_irq(client->irq); |
| |
| if (!tsdata->raw_buffer) { |
| tsdata->raw_bufsize = tsdata->num_x * tsdata->num_y * |
| sizeof(u16); |
| tsdata->raw_buffer = kzalloc(tsdata->raw_bufsize, GFP_KERNEL); |
| if (!tsdata->raw_buffer) { |
| error = -ENOMEM; |
| goto err_out; |
| } |
| } |
| |
| /* mode register is 0x3c when in the work mode */ |
| error = edt_ft5x06_register_write(tsdata, WORK_REGISTER_OPMODE, 0x03); |
| if (error) { |
| dev_err(&client->dev, |
| "failed to switch to factory mode, error %d\n", error); |
| goto err_out; |
| } |
| |
| tsdata->factory_mode = true; |
| do { |
| mdelay(EDT_SWITCH_MODE_DELAY); |
| /* mode register is 0x01 when in factory mode */ |
| ret = edt_ft5x06_register_read(tsdata, FACTORY_REGISTER_OPMODE); |
| if (ret == 0x03) |
| break; |
| } while (--retries > 0); |
| |
| if (retries == 0) { |
| dev_err(&client->dev, "not in factory mode after %dms.\n", |
| EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY); |
| error = -EIO; |
| goto err_out; |
| } |
| |
| return 0; |
| |
| err_out: |
| kfree(tsdata->raw_buffer); |
| tsdata->raw_buffer = NULL; |
| tsdata->factory_mode = false; |
| enable_irq(client->irq); |
| |
| return error; |
| } |
| |
| static int edt_ft5x06_work_mode(struct edt_ft5x06_ts_data *tsdata) |
| { |
| struct i2c_client *client = tsdata->client; |
| int retries = EDT_SWITCH_MODE_RETRIES; |
| struct edt_reg_addr *reg_addr = &tsdata->reg_addr; |
| int ret; |
| int error; |
| |
| /* mode register is 0x01 when in the factory mode */ |
| error = edt_ft5x06_register_write(tsdata, FACTORY_REGISTER_OPMODE, 0x1); |
| if (error) { |
| dev_err(&client->dev, |
| "failed to switch to work mode, error: %d\n", error); |
| return error; |
| } |
| |
| tsdata->factory_mode = false; |
| |
| do { |
| mdelay(EDT_SWITCH_MODE_DELAY); |
| /* mode register is 0x01 when in factory mode */ |
| ret = edt_ft5x06_register_read(tsdata, WORK_REGISTER_OPMODE); |
| if (ret == 0x01) |
| break; |
| } while (--retries > 0); |
| |
| if (retries == 0) { |
| dev_err(&client->dev, "not in work mode after %dms.\n", |
| EDT_SWITCH_MODE_RETRIES * EDT_SWITCH_MODE_DELAY); |
| tsdata->factory_mode = true; |
| return -EIO; |
| } |
| |
| kfree(tsdata->raw_buffer); |
| tsdata->raw_buffer = NULL; |
| |
| /* restore parameters */ |
| edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold, |
| tsdata->threshold); |
| edt_ft5x06_register_write(tsdata, reg_addr->reg_gain, |
| tsdata->gain); |
| if (reg_addr->reg_offset != NO_REGISTER) |
| edt_ft5x06_register_write(tsdata, reg_addr->reg_offset, |
| tsdata->offset); |
| if (reg_addr->reg_offset_x != NO_REGISTER) |
| edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_x, |
| tsdata->offset_x); |
| if (reg_addr->reg_offset_y != NO_REGISTER) |
| edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_y, |
| tsdata->offset_y); |
| if (reg_addr->reg_report_rate != NO_REGISTER) |
| edt_ft5x06_register_write(tsdata, reg_addr->reg_report_rate, |
| tsdata->report_rate); |
| |
| enable_irq(client->irq); |
| |
| return 0; |
| } |
| |
| static int edt_ft5x06_debugfs_mode_get(void *data, u64 *mode) |
| { |
| struct edt_ft5x06_ts_data *tsdata = data; |
| |
| *mode = tsdata->factory_mode; |
| |
| return 0; |
| }; |
| |
| static int edt_ft5x06_debugfs_mode_set(void *data, u64 mode) |
| { |
| struct edt_ft5x06_ts_data *tsdata = data; |
| int retval = 0; |
| |
| if (mode > 1) |
| return -ERANGE; |
| |
| mutex_lock(&tsdata->mutex); |
| |
| if (mode != tsdata->factory_mode) { |
| retval = mode ? edt_ft5x06_factory_mode(tsdata) : |
| edt_ft5x06_work_mode(tsdata); |
| } |
| |
| mutex_unlock(&tsdata->mutex); |
| |
| return retval; |
| }; |
| |
| DEFINE_SIMPLE_ATTRIBUTE(debugfs_mode_fops, edt_ft5x06_debugfs_mode_get, |
| edt_ft5x06_debugfs_mode_set, "%llu\n"); |
| |
| static ssize_t edt_ft5x06_debugfs_raw_data_read(struct file *file, |
| char __user *buf, size_t count, loff_t *off) |
| { |
| struct edt_ft5x06_ts_data *tsdata = file->private_data; |
| struct i2c_client *client = tsdata->client; |
| int retries = EDT_RAW_DATA_RETRIES; |
| int val, i, error; |
| size_t read = 0; |
| int colbytes; |
| char wrbuf[3]; |
| u8 *rdbuf; |
| |
| if (*off < 0 || *off >= tsdata->raw_bufsize) |
| return 0; |
| |
| mutex_lock(&tsdata->mutex); |
| |
| if (!tsdata->factory_mode || !tsdata->raw_buffer) { |
| error = -EIO; |
| goto out; |
| } |
| |
| error = edt_ft5x06_register_write(tsdata, 0x08, 0x01); |
| if (error) { |
| dev_dbg(&client->dev, |
| "failed to write 0x08 register, error %d\n", error); |
| goto out; |
| } |
| |
| do { |
| usleep_range(EDT_RAW_DATA_DELAY, EDT_RAW_DATA_DELAY + 100); |
| val = edt_ft5x06_register_read(tsdata, 0x08); |
| if (val < 1) |
| break; |
| } while (--retries > 0); |
| |
| if (val < 0) { |
| error = val; |
| dev_dbg(&client->dev, |
| "failed to read 0x08 register, error %d\n", error); |
| goto out; |
| } |
| |
| if (retries == 0) { |
| dev_dbg(&client->dev, |
| "timed out waiting for register to settle\n"); |
| error = -ETIMEDOUT; |
| goto out; |
| } |
| |
| rdbuf = tsdata->raw_buffer; |
| colbytes = tsdata->num_y * sizeof(u16); |
| |
| wrbuf[0] = 0xf5; |
| wrbuf[1] = 0x0e; |
| for (i = 0; i < tsdata->num_x; i++) { |
| wrbuf[2] = i; /* column index */ |
| error = edt_ft5x06_ts_readwrite(tsdata->client, |
| sizeof(wrbuf), wrbuf, |
| colbytes, rdbuf); |
| if (error) |
| goto out; |
| |
| rdbuf += colbytes; |
| } |
| |
| read = min_t(size_t, count, tsdata->raw_bufsize - *off); |
| if (copy_to_user(buf, tsdata->raw_buffer + *off, read)) { |
| error = -EFAULT; |
| goto out; |
| } |
| |
| *off += read; |
| out: |
| mutex_unlock(&tsdata->mutex); |
| return error ?: read; |
| }; |
| |
| static const struct file_operations debugfs_raw_data_fops = { |
| .open = simple_open, |
| .read = edt_ft5x06_debugfs_raw_data_read, |
| }; |
| |
| static void |
| edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata, |
| const char *debugfs_name) |
| { |
| tsdata->debug_dir = debugfs_create_dir(debugfs_name, NULL); |
| if (!tsdata->debug_dir) |
| return; |
| |
| debugfs_create_u16("num_x", S_IRUSR, tsdata->debug_dir, &tsdata->num_x); |
| debugfs_create_u16("num_y", S_IRUSR, tsdata->debug_dir, &tsdata->num_y); |
| |
| debugfs_create_file("mode", S_IRUSR | S_IWUSR, |
| tsdata->debug_dir, tsdata, &debugfs_mode_fops); |
| debugfs_create_file("raw_data", S_IRUSR, |
| tsdata->debug_dir, tsdata, &debugfs_raw_data_fops); |
| } |
| |
| static void |
| edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata) |
| { |
| debugfs_remove_recursive(tsdata->debug_dir); |
| kfree(tsdata->raw_buffer); |
| } |
| |
| #else |
| |
| static inline void |
| edt_ft5x06_ts_prepare_debugfs(struct edt_ft5x06_ts_data *tsdata, |
| const char *debugfs_name) |
| { |
| } |
| |
| static inline void |
| edt_ft5x06_ts_teardown_debugfs(struct edt_ft5x06_ts_data *tsdata) |
| { |
| } |
| |
| #endif /* CONFIG_DEBUGFS */ |
| |
| static int edt_ft5x06_ts_identify(struct i2c_client *client, |
| struct edt_ft5x06_ts_data *tsdata, |
| char *fw_version) |
| { |
| u8 rdbuf[EDT_NAME_LEN]; |
| char *p; |
| int error; |
| char *model_name = tsdata->name; |
| |
| /* see what we find if we assume it is a M06 * |
| * if we get less than EDT_NAME_LEN, we don't want |
| * to have garbage in there |
| */ |
| memset(rdbuf, 0, sizeof(rdbuf)); |
| error = edt_ft5x06_ts_readwrite(client, 1, "\xBB", |
| EDT_NAME_LEN - 1, rdbuf); |
| if (error) |
| return error; |
| |
| /* Probe content for something consistent. |
| * M06 starts with a response byte, M12 gives the data directly. |
| * M09/Generic does not provide model number information. |
| */ |
| if (!strncasecmp(rdbuf + 1, "EP0", 3)) { |
| tsdata->version = EDT_M06; |
| |
| /* remove last '$' end marker */ |
| rdbuf[EDT_NAME_LEN - 1] = '\0'; |
| if (rdbuf[EDT_NAME_LEN - 2] == '$') |
| rdbuf[EDT_NAME_LEN - 2] = '\0'; |
| |
| /* look for Model/Version separator */ |
| p = strchr(rdbuf, '*'); |
| if (p) |
| *p++ = '\0'; |
| strlcpy(model_name, rdbuf + 1, EDT_NAME_LEN); |
| strlcpy(fw_version, p ? p : "", EDT_NAME_LEN); |
| } else if (!strncasecmp(rdbuf, "EP0", 3)) { |
| tsdata->version = EDT_M12; |
| |
| /* remove last '$' end marker */ |
| rdbuf[EDT_NAME_LEN - 2] = '\0'; |
| if (rdbuf[EDT_NAME_LEN - 3] == '$') |
| rdbuf[EDT_NAME_LEN - 3] = '\0'; |
| |
| /* look for Model/Version separator */ |
| p = strchr(rdbuf, '*'); |
| if (p) |
| *p++ = '\0'; |
| strlcpy(model_name, rdbuf, EDT_NAME_LEN); |
| strlcpy(fw_version, p ? p : "", EDT_NAME_LEN); |
| } else { |
| /* If it is not an EDT M06/M12 touchscreen, then the model |
| * detection is a bit hairy. The different ft5x06 |
| * firmares around don't reliably implement the |
| * identification registers. Well, we'll take a shot. |
| * |
| * The main difference between generic focaltec based |
| * touches and EDT M09 is that we know how to retrieve |
| * the max coordinates for the latter. |
| */ |
| tsdata->version = GENERIC_FT; |
| |
| error = edt_ft5x06_ts_readwrite(client, 1, "\xA6", |
| 2, rdbuf); |
| if (error) |
| return error; |
| |
| strlcpy(fw_version, rdbuf, 2); |
| |
| error = edt_ft5x06_ts_readwrite(client, 1, "\xA8", |
| 1, rdbuf); |
| if (error) |
| return error; |
| |
| /* This "model identification" is not exact. Unfortunately |
| * not all firmwares for the ft5x06 put useful values in |
| * the identification registers. |
| */ |
| switch (rdbuf[0]) { |
| case 0x35: /* EDT EP0350M09 */ |
| case 0x43: /* EDT EP0430M09 */ |
| case 0x50: /* EDT EP0500M09 */ |
| case 0x57: /* EDT EP0570M09 */ |
| case 0x70: /* EDT EP0700M09 */ |
| tsdata->version = EDT_M09; |
| snprintf(model_name, EDT_NAME_LEN, "EP0%i%i0M09", |
| rdbuf[0] >> 4, rdbuf[0] & 0x0F); |
| break; |
| case 0xa1: /* EDT EP1010ML00 */ |
| tsdata->version = EDT_M09; |
| snprintf(model_name, EDT_NAME_LEN, "EP%i%i0ML00", |
| rdbuf[0] >> 4, rdbuf[0] & 0x0F); |
| break; |
| case 0x5a: /* Solomon Goldentek Display */ |
| snprintf(model_name, EDT_NAME_LEN, "GKTW50SCED1R0"); |
| break; |
| case 0x59: /* Evervision Display with FT5xx6 TS */ |
| tsdata->version = EV_FT; |
| error = edt_ft5x06_ts_readwrite(client, 1, "\x53", |
| 1, rdbuf); |
| if (error) |
| return error; |
| strlcpy(fw_version, rdbuf, 1); |
| snprintf(model_name, EDT_NAME_LEN, |
| "EVERVISION-FT5726NEi"); |
| break; |
| default: |
| snprintf(model_name, EDT_NAME_LEN, |
| "generic ft5x06 (%02x)", |
| rdbuf[0]); |
| break; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void edt_ft5x06_ts_get_defaults(struct device *dev, |
| struct edt_ft5x06_ts_data *tsdata) |
| { |
| struct edt_reg_addr *reg_addr = &tsdata->reg_addr; |
| u32 val; |
| int error; |
| |
| error = device_property_read_u32(dev, "threshold", &val); |
| if (!error) { |
| edt_ft5x06_register_write(tsdata, reg_addr->reg_threshold, val); |
| tsdata->threshold = val; |
| } |
| |
| error = device_property_read_u32(dev, "gain", &val); |
| if (!error) { |
| edt_ft5x06_register_write(tsdata, reg_addr->reg_gain, val); |
| tsdata->gain = val; |
| } |
| |
| error = device_property_read_u32(dev, "offset", &val); |
| if (!error) { |
| edt_ft5x06_register_write(tsdata, reg_addr->reg_offset, val); |
| tsdata->offset = val; |
| } |
| |
| error = device_property_read_u32(dev, "offset-x", &val); |
| if (!error) { |
| edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_x, val); |
| tsdata->offset_x = val; |
| } |
| |
| error = device_property_read_u32(dev, "offset-y", &val); |
| if (!error) { |
| edt_ft5x06_register_write(tsdata, reg_addr->reg_offset_y, val); |
| tsdata->offset_y = val; |
| } |
| } |
| |
| static void |
| edt_ft5x06_ts_get_parameters(struct edt_ft5x06_ts_data *tsdata) |
| { |
| struct edt_reg_addr *reg_addr = &tsdata->reg_addr; |
| |
| tsdata->threshold = edt_ft5x06_register_read(tsdata, |
| reg_addr->reg_threshold); |
| tsdata->gain = edt_ft5x06_register_read(tsdata, reg_addr->reg_gain); |
| if (reg_addr->reg_offset != NO_REGISTER) |
| tsdata->offset = |
| edt_ft5x06_register_read(tsdata, reg_addr->reg_offset); |
| if (reg_addr->reg_offset_x != NO_REGISTER) |
| tsdata->offset_x = edt_ft5x06_register_read(tsdata, |
| reg_addr->reg_offset_x); |
| if (reg_addr->reg_offset_y != NO_REGISTER) |
| tsdata->offset_y = edt_ft5x06_register_read(tsdata, |
| reg_addr->reg_offset_y); |
| if (reg_addr->reg_report_rate != NO_REGISTER) |
| tsdata->report_rate = edt_ft5x06_register_read(tsdata, |
| reg_addr->reg_report_rate); |
| if (tsdata->version == EDT_M06 || |
| tsdata->version == EDT_M09 || |
| tsdata->version == EDT_M12) { |
| tsdata->num_x = edt_ft5x06_register_read(tsdata, |
| reg_addr->reg_num_x); |
| tsdata->num_y = edt_ft5x06_register_read(tsdata, |
| reg_addr->reg_num_y); |
| } else { |
| tsdata->num_x = -1; |
| tsdata->num_y = -1; |
| } |
| } |
| |
| static void |
| edt_ft5x06_ts_set_regs(struct edt_ft5x06_ts_data *tsdata) |
| { |
| struct edt_reg_addr *reg_addr = &tsdata->reg_addr; |
| |
| switch (tsdata->version) { |
| case EDT_M06: |
| reg_addr->reg_threshold = WORK_REGISTER_THRESHOLD; |
| reg_addr->reg_report_rate = WORK_REGISTER_REPORT_RATE; |
| reg_addr->reg_gain = WORK_REGISTER_GAIN; |
| reg_addr->reg_offset = WORK_REGISTER_OFFSET; |
| reg_addr->reg_offset_x = NO_REGISTER; |
| reg_addr->reg_offset_y = NO_REGISTER; |
| reg_addr->reg_num_x = WORK_REGISTER_NUM_X; |
| reg_addr->reg_num_y = WORK_REGISTER_NUM_Y; |
| break; |
| |
| case EDT_M09: |
| case EDT_M12: |
| reg_addr->reg_threshold = M09_REGISTER_THRESHOLD; |
| reg_addr->reg_report_rate = NO_REGISTER; |
| reg_addr->reg_gain = M09_REGISTER_GAIN; |
| reg_addr->reg_offset = M09_REGISTER_OFFSET; |
| reg_addr->reg_offset_x = NO_REGISTER; |
| reg_addr->reg_offset_y = NO_REGISTER; |
| reg_addr->reg_num_x = M09_REGISTER_NUM_X; |
| reg_addr->reg_num_y = M09_REGISTER_NUM_Y; |
| break; |
| |
| case EV_FT: |
| reg_addr->reg_threshold = EV_REGISTER_THRESHOLD; |
| reg_addr->reg_gain = EV_REGISTER_GAIN; |
| reg_addr->reg_offset = NO_REGISTER; |
| reg_addr->reg_offset_x = EV_REGISTER_OFFSET_X; |
| reg_addr->reg_offset_y = EV_REGISTER_OFFSET_Y; |
| reg_addr->reg_num_x = NO_REGISTER; |
| reg_addr->reg_num_y = NO_REGISTER; |
| reg_addr->reg_report_rate = NO_REGISTER; |
| break; |
| |
| case GENERIC_FT: |
| /* this is a guesswork */ |
| reg_addr->reg_threshold = M09_REGISTER_THRESHOLD; |
| reg_addr->reg_gain = M09_REGISTER_GAIN; |
| reg_addr->reg_offset = M09_REGISTER_OFFSET; |
| reg_addr->reg_offset_x = NO_REGISTER; |
| reg_addr->reg_offset_y = NO_REGISTER; |
| break; |
| } |
| } |
| |
| static int edt_ft5x06_ts_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| const struct edt_i2c_chip_data *chip_data; |
| struct edt_ft5x06_ts_data *tsdata; |
| struct input_dev *input; |
| unsigned long irq_flags; |
| int error; |
| char fw_version[EDT_NAME_LEN]; |
| |
| dev_dbg(&client->dev, "probing for EDT FT5x06 I2C\n"); |
| |
| tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL); |
| if (!tsdata) { |
| dev_err(&client->dev, "failed to allocate driver data.\n"); |
| return -ENOMEM; |
| } |
| |
| chip_data = device_get_match_data(&client->dev); |
| if (!chip_data) |
| chip_data = (const struct edt_i2c_chip_data *)id->driver_data; |
| if (!chip_data || !chip_data->max_support_points) { |
| dev_err(&client->dev, "invalid or missing chip data\n"); |
| return -EINVAL; |
| } |
| |
| tsdata->max_support_points = chip_data->max_support_points; |
| |
| tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev, |
| "reset", GPIOD_OUT_HIGH); |
| if (IS_ERR(tsdata->reset_gpio)) { |
| error = PTR_ERR(tsdata->reset_gpio); |
| dev_err(&client->dev, |
| "Failed to request GPIO reset pin, error %d\n", error); |
| return error; |
| } |
| |
| tsdata->wake_gpio = devm_gpiod_get_optional(&client->dev, |
| "wake", GPIOD_OUT_LOW); |
| if (IS_ERR(tsdata->wake_gpio)) { |
| error = PTR_ERR(tsdata->wake_gpio); |
| dev_err(&client->dev, |
| "Failed to request GPIO wake pin, error %d\n", error); |
| return error; |
| } |
| |
| if (tsdata->wake_gpio) { |
| usleep_range(5000, 6000); |
| gpiod_set_value_cansleep(tsdata->wake_gpio, 1); |
| } |
| |
| if (tsdata->reset_gpio) { |
| usleep_range(5000, 6000); |
| gpiod_set_value_cansleep(tsdata->reset_gpio, 0); |
| msleep(300); |
| } |
| |
| input = devm_input_allocate_device(&client->dev); |
| if (!input) { |
| dev_err(&client->dev, "failed to allocate input device.\n"); |
| return -ENOMEM; |
| } |
| |
| mutex_init(&tsdata->mutex); |
| tsdata->client = client; |
| tsdata->input = input; |
| tsdata->factory_mode = false; |
| |
| error = edt_ft5x06_ts_identify(client, tsdata, fw_version); |
| if (error) { |
| dev_err(&client->dev, "touchscreen probe failed\n"); |
| return error; |
| } |
| |
| edt_ft5x06_ts_set_regs(tsdata); |
| edt_ft5x06_ts_get_defaults(&client->dev, tsdata); |
| edt_ft5x06_ts_get_parameters(tsdata); |
| |
| dev_dbg(&client->dev, |
| "Model \"%s\", Rev. \"%s\", %dx%d sensors\n", |
| tsdata->name, fw_version, tsdata->num_x, tsdata->num_y); |
| |
| input->name = tsdata->name; |
| input->id.bustype = BUS_I2C; |
| input->dev.parent = &client->dev; |
| |
| if (tsdata->version == EDT_M06 || |
| tsdata->version == EDT_M09 || |
| tsdata->version == EDT_M12) { |
| input_set_abs_params(input, ABS_MT_POSITION_X, |
| 0, tsdata->num_x * 64 - 1, 0, 0); |
| input_set_abs_params(input, ABS_MT_POSITION_Y, |
| 0, tsdata->num_y * 64 - 1, 0, 0); |
| } else { |
| /* Unknown maximum values. Specify via devicetree */ |
| input_set_abs_params(input, ABS_MT_POSITION_X, |
| 0, 65535, 0, 0); |
| input_set_abs_params(input, ABS_MT_POSITION_Y, |
| 0, 65535, 0, 0); |
| } |
| |
| touchscreen_parse_properties(input, true, &tsdata->prop); |
| |
| error = input_mt_init_slots(input, tsdata->max_support_points, |
| INPUT_MT_DIRECT); |
| if (error) { |
| dev_err(&client->dev, "Unable to init MT slots.\n"); |
| return error; |
| } |
| |
| i2c_set_clientdata(client, tsdata); |
| |
| irq_flags = irq_get_trigger_type(client->irq); |
| if (irq_flags == IRQF_TRIGGER_NONE) |
| irq_flags = IRQF_TRIGGER_FALLING; |
| irq_flags |= IRQF_ONESHOT; |
| |
| error = devm_request_threaded_irq(&client->dev, client->irq, |
| NULL, edt_ft5x06_ts_isr, irq_flags, |
| client->name, tsdata); |
| if (error) { |
| dev_err(&client->dev, "Unable to request touchscreen IRQ.\n"); |
| return error; |
| } |
| |
| error = devm_device_add_group(&client->dev, &edt_ft5x06_attr_group); |
| if (error) |
| return error; |
| |
| error = input_register_device(input); |
| if (error) |
| return error; |
| |
| edt_ft5x06_ts_prepare_debugfs(tsdata, dev_driver_string(&client->dev)); |
| device_init_wakeup(&client->dev, 1); |
| |
| dev_dbg(&client->dev, |
| "EDT FT5x06 initialized: IRQ %d, WAKE pin %d, Reset pin %d.\n", |
| client->irq, |
| tsdata->wake_gpio ? desc_to_gpio(tsdata->wake_gpio) : -1, |
| tsdata->reset_gpio ? desc_to_gpio(tsdata->reset_gpio) : -1); |
| |
| return 0; |
| } |
| |
| static int edt_ft5x06_ts_remove(struct i2c_client *client) |
| { |
| struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client); |
| |
| edt_ft5x06_ts_teardown_debugfs(tsdata); |
| |
| return 0; |
| } |
| |
| static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| |
| if (device_may_wakeup(dev)) |
| enable_irq_wake(client->irq); |
| |
| return 0; |
| } |
| |
| static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| |
| if (device_may_wakeup(dev)) |
| disable_irq_wake(client->irq); |
| |
| return 0; |
| } |
| |
| static SIMPLE_DEV_PM_OPS(edt_ft5x06_ts_pm_ops, |
| edt_ft5x06_ts_suspend, edt_ft5x06_ts_resume); |
| |
| static const struct edt_i2c_chip_data edt_ft5x06_data = { |
| .max_support_points = 5, |
| }; |
| |
| static const struct edt_i2c_chip_data edt_ft5506_data = { |
| .max_support_points = 10, |
| }; |
| |
| static const struct edt_i2c_chip_data edt_ft6236_data = { |
| .max_support_points = 2, |
| }; |
| |
| static const struct i2c_device_id edt_ft5x06_ts_id[] = { |
| { .name = "edt-ft5x06", .driver_data = (long)&edt_ft5x06_data }, |
| { .name = "edt-ft5506", .driver_data = (long)&edt_ft5506_data }, |
| { .name = "ev-ft5726", .driver_data = (long)&edt_ft5506_data }, |
| /* Note no edt- prefix for compatibility with the ft6236.c driver */ |
| { .name = "ft6236", .driver_data = (long)&edt_ft6236_data }, |
| { /* sentinel */ } |
| }; |
| MODULE_DEVICE_TABLE(i2c, edt_ft5x06_ts_id); |
| |
| static const struct of_device_id edt_ft5x06_of_match[] = { |
| { .compatible = "edt,edt-ft5206", .data = &edt_ft5x06_data }, |
| { .compatible = "edt,edt-ft5306", .data = &edt_ft5x06_data }, |
| { .compatible = "edt,edt-ft5406", .data = &edt_ft5x06_data }, |
| { .compatible = "edt,edt-ft5506", .data = &edt_ft5506_data }, |
| { .compatible = "evervision,ev-ft5726", .data = &edt_ft5506_data }, |
| /* Note focaltech vendor prefix for compatibility with ft6236.c */ |
| { .compatible = "focaltech,ft6236", .data = &edt_ft6236_data }, |
| { /* sentinel */ } |
| }; |
| MODULE_DEVICE_TABLE(of, edt_ft5x06_of_match); |
| |
| static struct i2c_driver edt_ft5x06_ts_driver = { |
| .driver = { |
| .name = "edt_ft5x06", |
| .of_match_table = edt_ft5x06_of_match, |
| .pm = &edt_ft5x06_ts_pm_ops, |
| }, |
| .id_table = edt_ft5x06_ts_id, |
| .probe = edt_ft5x06_ts_probe, |
| .remove = edt_ft5x06_ts_remove, |
| }; |
| |
| module_i2c_driver(edt_ft5x06_ts_driver); |
| |
| MODULE_AUTHOR("Simon Budig <simon.budig@kernelconcepts.de>"); |
| MODULE_DESCRIPTION("EDT FT5x06 I2C Touchscreen Driver"); |
| MODULE_LICENSE("GPL v2"); |