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SPDX-License-Identifier: GPL-2.0-only/* * Driver for Goodix Touchscreens * * Copyright (c) 2014 Red Hat Inc. * Copyright (c) 2015 K. Merker <merker@debian.org> * * This code is based on gt9xx.c authored by andrew@goodix.com: * * 2010 - 2012 Goodix Technology. */
#include <linux/kernel.h>#include <linux/dmi.h>#include <linux/firmware.h>#include <linux/module.h>#include <linux/delay.h>#include <linux/irq.h>#include <linux/interrupt.h>#include <linux/platform_data/x86/soc.h>#include <linux/slab.h>#include <linux/acpi.h>#include <linux/of.h>#include <linux/unaligned.h>#include "goodix.h"
#define GOODIX_GPIO_INT_NAME "irq"#define GOODIX_GPIO_RST_NAME "reset"
#define GOODIX_MAX_HEIGHT 4096#define GOODIX_MAX_WIDTH 4096#define GOODIX_INT_TRIGGER 1#define GOODIX_CONTACT_SIZE 8#define GOODIX_MAX_CONTACT_SIZE 9#define GOODIX_MAX_CONTACTS 10
#define GOODIX_CONFIG_MIN_LENGTH 186#define GOODIX_CONFIG_911_LENGTH 186#define GOODIX_CONFIG_967_LENGTH 228#define GOODIX_CONFIG_GT9X_LENGTH 240
#define GOODIX_BUFFER_STATUS_READY BIT(7)#define GOODIX_HAVE_KEY BIT(4)#define GOODIX_BUFFER_STATUS_TIMEOUT 20
#define RESOLUTION_LOC 1#define MAX_CONTACTS_LOC 5#define TRIGGER_LOC 6
#define GOODIX_POLL_INTERVAL_MS 17 /* 17ms = 60fps */
/* Our special handling for GPIO accesses through ACPI is x86 specific */#if defined CONFIG_X86 && defined CONFIG_ACPI#define ACPI_GPIO_SUPPORT#endif
struct goodix_chip_id { const char *id; const struct goodix_chip_data *data;};
static int goodix_check_cfg_8(struct goodix_ts_data *ts, const u8 *cfg, int len);static int goodix_check_cfg_16(struct goodix_ts_data *ts, const u8 *cfg, int len);static void goodix_calc_cfg_checksum_8(struct goodix_ts_data *ts);static void goodix_calc_cfg_checksum_16(struct goodix_ts_data *ts);
static const struct goodix_chip_data gt1x_chip_data = { .config_addr = GOODIX_GT1X_REG_CONFIG_DATA, .config_len = GOODIX_CONFIG_GT9X_LENGTH, .check_config = goodix_check_cfg_16, .calc_config_checksum = goodix_calc_cfg_checksum_16,};
static const struct goodix_chip_data gt911_chip_data = { .config_addr = GOODIX_GT9X_REG_CONFIG_DATA, .config_len = GOODIX_CONFIG_911_LENGTH, .check_config = goodix_check_cfg_8, .calc_config_checksum = goodix_calc_cfg_checksum_8,};
static const struct goodix_chip_data gt967_chip_data = { .config_addr = GOODIX_GT9X_REG_CONFIG_DATA, .config_len = GOODIX_CONFIG_967_LENGTH, .check_config = goodix_check_cfg_8, .calc_config_checksum = goodix_calc_cfg_checksum_8,};
static const struct goodix_chip_data gt9x_chip_data = { .config_addr = GOODIX_GT9X_REG_CONFIG_DATA, .config_len = GOODIX_CONFIG_GT9X_LENGTH, .check_config = goodix_check_cfg_8, .calc_config_checksum = goodix_calc_cfg_checksum_8,};
static const struct goodix_chip_id goodix_chip_ids[] = { { .id = "1151", .data = >1x_chip_data }, { .id = "1158", .data = >1x_chip_data }, { .id = "5663", .data = >1x_chip_data }, { .id = "5688", .data = >1x_chip_data }, { .id = "917S", .data = >1x_chip_data }, { .id = "9286", .data = >1x_chip_data },
{ .id = "911", .data = >911_chip_data }, { .id = "9271", .data = >911_chip_data }, { .id = "9110", .data = >911_chip_data }, { .id = "9111", .data = >911_chip_data }, { .id = "927", .data = >911_chip_data }, { .id = "928", .data = >911_chip_data },
{ .id = "912", .data = >967_chip_data }, { .id = "9147", .data = >967_chip_data }, { .id = "967", .data = >967_chip_data }, { }};
static const unsigned long goodix_irq_flags[] = { IRQ_TYPE_EDGE_RISING, IRQ_TYPE_EDGE_FALLING, IRQ_TYPE_LEVEL_LOW, IRQ_TYPE_LEVEL_HIGH,};
static const struct dmi_system_id nine_bytes_report[] = {#if defined(CONFIG_DMI) && defined(CONFIG_X86) { /* Lenovo Yoga Book X90F / X90L */ .matches = { DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Intel Corporation"), DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "CHERRYVIEW D1 PLATFORM"), DMI_EXACT_MATCH(DMI_PRODUCT_VERSION, "YETI-11"), } }, { /* Lenovo Yoga Book X91F / X91L */ .matches = { /* Non exact match to match F + L versions */ DMI_MATCH(DMI_PRODUCT_NAME, "Lenovo YB1-X91"), } },#endif {}};
/* * Those tablets have their x coordinate inverted */static const struct dmi_system_id inverted_x_screen[] = {#if defined(CONFIG_DMI) && defined(CONFIG_X86) { .ident = "Cube I15-TC", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "Cube"), DMI_MATCH(DMI_PRODUCT_NAME, "I15-TC") }, },#endif {}};
/** * goodix_i2c_read - read data from a register of the i2c slave device. * * @client: i2c device. * @reg: the register to read from. * @buf: raw write data buffer. * @len: length of the buffer to write */int goodix_i2c_read(struct i2c_client *client, u16 reg, u8 *buf, int len){ struct i2c_msg msgs[2]; __be16 wbuf = cpu_to_be16(reg); int ret;
msgs[0].flags = 0; msgs[0].addr = client->addr; msgs[0].len = 2; msgs[0].buf = (u8 *)&wbuf;
msgs[1].flags = I2C_M_RD; msgs[1].addr = client->addr; msgs[1].len = len; msgs[1].buf = buf;
ret = i2c_transfer(client->adapter, msgs, 2); if (ret >= 0) ret = (ret == ARRAY_SIZE(msgs) ? 0 : -EIO);
if (ret) dev_err(&client->dev, "Error reading %d bytes from 0x%04x: %d\n", len, reg, ret); return ret;}
/** * goodix_i2c_write - write data to a register of the i2c slave device. * * @client: i2c device. * @reg: the register to write to. * @buf: raw data buffer to write. * @len: length of the buffer to write */int goodix_i2c_write(struct i2c_client *client, u16 reg, const u8 *buf, int len){ u8 *addr_buf; struct i2c_msg msg; int ret;
addr_buf = kmalloc(len + 2, GFP_KERNEL); if (!addr_buf) return -ENOMEM;
addr_buf[0] = reg >> 8; addr_buf[1] = reg & 0xFF; memcpy(&addr_buf[2], buf, len);
msg.flags = 0; msg.addr = client->addr; msg.buf = addr_buf; msg.len = len + 2;
ret = i2c_transfer(client->adapter, &msg, 1); if (ret >= 0) ret = (ret == 1 ? 0 : -EIO);
kfree(addr_buf);
if (ret) dev_err(&client->dev, "Error writing %d bytes to 0x%04x: %d\n", len, reg, ret); return ret;}
int goodix_i2c_write_u8(struct i2c_client *client, u16 reg, u8 value){ return goodix_i2c_write(client, reg, &value, sizeof(value));}
static const struct goodix_chip_data *goodix_get_chip_data(const char *id){ unsigned int i;
for (i = 0; goodix_chip_ids[i].id; i++) { if (!strcmp(goodix_chip_ids[i].id, id)) return goodix_chip_ids[i].data; }
return >9x_chip_data;}
static int goodix_ts_read_input_report(struct goodix_ts_data *ts, u8 *data){ unsigned long max_timeout; int touch_num; int error; u16 addr = GOODIX_READ_COOR_ADDR; /* * We are going to read 1-byte header, * ts->contact_size * max(1, touch_num) bytes of coordinates * and 1-byte footer which contains the touch-key code. */ const int header_contact_keycode_size = 1 + ts->contact_size + 1;
/* * The 'buffer status' bit, which indicates that the data is valid, is * not set as soon as the interrupt is raised, but slightly after. * This takes around 10 ms to happen, so we poll for 20 ms. */ max_timeout = jiffies + msecs_to_jiffies(GOODIX_BUFFER_STATUS_TIMEOUT); do { error = goodix_i2c_read(ts->client, addr, data, header_contact_keycode_size); if (error) return error;
if (data[0] & GOODIX_BUFFER_STATUS_READY) { touch_num = data[0] & 0x0f; if (touch_num > ts->max_touch_num) return -EPROTO;
if (touch_num > 1) { addr += header_contact_keycode_size; data += header_contact_keycode_size; error = goodix_i2c_read(ts->client, addr, data, ts->contact_size * (touch_num - 1)); if (error) return error; }
return touch_num; }
if (data[0] == 0 && ts->firmware_name) { if (goodix_handle_fw_request(ts)) return 0; }
usleep_range(1000, 2000); /* Poll every 1 - 2 ms */ } while (time_before(jiffies, max_timeout));
/* * The Goodix panel will send spurious interrupts after a * 'finger up' event, which will always cause a timeout. */ return -ENOMSG;}
static int goodix_create_pen_input(struct goodix_ts_data *ts){ struct device *dev = &ts->client->dev; struct input_dev *input;
input = devm_input_allocate_device(dev); if (!input) return -ENOMEM;
input_copy_abs(input, ABS_X, ts->input_dev, ABS_MT_POSITION_X); input_copy_abs(input, ABS_Y, ts->input_dev, ABS_MT_POSITION_Y); /* * The resolution of these touchscreens is about 10 units/mm, the actual * resolution does not matter much since we set INPUT_PROP_DIRECT. * Userspace wants something here though, so just set it to 10 units/mm. */ input_abs_set_res(input, ABS_X, 10); input_abs_set_res(input, ABS_Y, 10); input_set_abs_params(input, ABS_PRESSURE, 0, 255, 0, 0);
input_set_capability(input, EV_KEY, BTN_TOUCH); input_set_capability(input, EV_KEY, BTN_TOOL_PEN); input_set_capability(input, EV_KEY, BTN_STYLUS); input_set_capability(input, EV_KEY, BTN_STYLUS2); __set_bit(INPUT_PROP_DIRECT, input->propbit);
input->name = "Goodix Active Pen"; input->phys = "input/pen"; input->id.bustype = BUS_I2C; input->id.vendor = 0x0416; if (kstrtou16(ts->id, 10, &input->id.product)) input->id.product = 0x1001; input->id.version = ts->version;
ts->input_pen = input; return 0;}
static void goodix_ts_report_pen_down(struct goodix_ts_data *ts, u8 *data){ int input_x, input_y, input_w, error; u8 key_value;
if (!ts->pen_input_registered) { error = input_register_device(ts->input_pen); ts->pen_input_registered = (error == 0) ? 1 : error; }
if (ts->pen_input_registered < 0) return;
if (ts->contact_size == 9) { input_x = get_unaligned_le16(&data[4]); input_y = get_unaligned_le16(&data[6]); input_w = get_unaligned_le16(&data[8]); } else { input_x = get_unaligned_le16(&data[2]); input_y = get_unaligned_le16(&data[4]); input_w = get_unaligned_le16(&data[6]); }
touchscreen_report_pos(ts->input_pen, &ts->prop, input_x, input_y, false); input_report_abs(ts->input_pen, ABS_PRESSURE, input_w);
input_report_key(ts->input_pen, BTN_TOUCH, 1); input_report_key(ts->input_pen, BTN_TOOL_PEN, 1);
if (data[0] & GOODIX_HAVE_KEY) { key_value = data[1 + ts->contact_size]; input_report_key(ts->input_pen, BTN_STYLUS, key_value & 0x10); input_report_key(ts->input_pen, BTN_STYLUS2, key_value & 0x20); } else { input_report_key(ts->input_pen, BTN_STYLUS, 0); input_report_key(ts->input_pen, BTN_STYLUS2, 0); }
input_sync(ts->input_pen);}
static void goodix_ts_report_pen_up(struct goodix_ts_data *ts){ if (!ts->input_pen) return;
input_report_key(ts->input_pen, BTN_TOUCH, 0); input_report_key(ts->input_pen, BTN_TOOL_PEN, 0); input_report_key(ts->input_pen, BTN_STYLUS, 0); input_report_key(ts->input_pen, BTN_STYLUS2, 0);
input_sync(ts->input_pen);}
static void goodix_ts_report_touch_8b(struct goodix_ts_data *ts, u8 *coor_data){ int id = coor_data[0] & 0x0F; int input_x = get_unaligned_le16(&coor_data[1]); int input_y = get_unaligned_le16(&coor_data[3]); int input_w = get_unaligned_le16(&coor_data[5]);
input_mt_slot(ts->input_dev, id); input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true); touchscreen_report_pos(ts->input_dev, &ts->prop, input_x, input_y, true); input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w); input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w);}
static void goodix_ts_report_touch_9b(struct goodix_ts_data *ts, u8 *coor_data){ int id = coor_data[1] & 0x0F; int input_x = get_unaligned_le16(&coor_data[3]); int input_y = get_unaligned_le16(&coor_data[5]); int input_w = get_unaligned_le16(&coor_data[7]);
input_mt_slot(ts->input_dev, id); input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true); touchscreen_report_pos(ts->input_dev, &ts->prop, input_x, input_y, true); input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w); input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w);}
static void goodix_ts_release_keys(struct goodix_ts_data *ts){ int i;
for (i = 0; i < GOODIX_MAX_KEYS; i++) input_report_key(ts->input_dev, ts->keymap[i], 0);}
static void goodix_ts_report_key(struct goodix_ts_data *ts, u8 *data){ int touch_num; u8 key_value; int i;
if (data[0] & GOODIX_HAVE_KEY) { touch_num = data[0] & 0x0f; key_value = data[1 + ts->contact_size * touch_num]; for (i = 0; i < GOODIX_MAX_KEYS; i++) if (key_value & BIT(i)) input_report_key(ts->input_dev, ts->keymap[i], 1); } else { goodix_ts_release_keys(ts); }}
/** * goodix_process_events - Process incoming events * * @ts: our goodix_ts_data pointer * * Called when the IRQ is triggered. Read the current device state, and push * the input events to the user space. */static void goodix_process_events(struct goodix_ts_data *ts){ u8 point_data[2 + GOODIX_MAX_CONTACT_SIZE * GOODIX_MAX_CONTACTS]; int touch_num; int i;
touch_num = goodix_ts_read_input_report(ts, point_data); if (touch_num < 0) return;
/* The pen being down is always reported as a single touch */ if (touch_num == 1 && (point_data[1] & 0x80)) { goodix_ts_report_pen_down(ts, point_data); goodix_ts_release_keys(ts); goto sync; /* Release any previously registered touches */ } else { goodix_ts_report_pen_up(ts); }
goodix_ts_report_key(ts, point_data);
for (i = 0; i < touch_num; i++) if (ts->contact_size == 9) goodix_ts_report_touch_9b(ts, &point_data[1 + ts->contact_size * i]); else goodix_ts_report_touch_8b(ts, &point_data[1 + ts->contact_size * i]);
sync: input_mt_sync_frame(ts->input_dev); input_sync(ts->input_dev);}
static void goodix_ts_work_i2c_poll(struct input_dev *input){ struct goodix_ts_data *ts = input_get_drvdata(input);
goodix_process_events(ts); goodix_i2c_write_u8(ts->client, GOODIX_READ_COOR_ADDR, 0);}
/** * goodix_ts_irq_handler - The IRQ handler * * @irq: interrupt number. * @dev_id: private data pointer. */static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id){ struct goodix_ts_data *ts = dev_id;
goodix_process_events(ts); goodix_i2c_write_u8(ts->client, GOODIX_READ_COOR_ADDR, 0);
return IRQ_HANDLED;}
static void goodix_enable_irq(struct goodix_ts_data *ts){ if (ts->client->irq) enable_irq(ts->client->irq);}
static void goodix_disable_irq(struct goodix_ts_data *ts){ if (ts->client->irq) disable_irq(ts->client->irq);}
static void goodix_free_irq(struct goodix_ts_data *ts){ if (ts->client->irq) devm_free_irq(&ts->client->dev, ts->client->irq, ts);}
static int goodix_request_irq(struct goodix_ts_data *ts){ if (!ts->client->irq) return 0;
return devm_request_threaded_irq(&ts->client->dev, ts->client->irq, NULL, goodix_ts_irq_handler, ts->irq_flags, ts->client->name, ts);}
static int goodix_check_cfg_8(struct goodix_ts_data *ts, const u8 *cfg, int len){ int i, raw_cfg_len = len - 2; u8 check_sum = 0;
for (i = 0; i < raw_cfg_len; i++) check_sum += cfg[i]; check_sum = (~check_sum) + 1; if (check_sum != cfg[raw_cfg_len]) { dev_err(&ts->client->dev, "The checksum of the config fw is not correct"); return -EINVAL; }
if (cfg[raw_cfg_len + 1] != 1) { dev_err(&ts->client->dev, "Config fw must have Config_Fresh register set"); return -EINVAL; }
return 0;}
static void goodix_calc_cfg_checksum_8(struct goodix_ts_data *ts){ int i, raw_cfg_len = ts->chip->config_len - 2; u8 check_sum = 0;
for (i = 0; i < raw_cfg_len; i++) check_sum += ts->config[i]; check_sum = (~check_sum) + 1;
ts->config[raw_cfg_len] = check_sum; ts->config[raw_cfg_len + 1] = 1; /* Set "config_fresh" bit */}
static int goodix_check_cfg_16(struct goodix_ts_data *ts, const u8 *cfg, int len){ int i, raw_cfg_len = len - 3; u16 check_sum = 0;
for (i = 0; i < raw_cfg_len; i += 2) check_sum += get_unaligned_be16(&cfg[i]); check_sum = (~check_sum) + 1; if (check_sum != get_unaligned_be16(&cfg[raw_cfg_len])) { dev_err(&ts->client->dev, "The checksum of the config fw is not correct"); return -EINVAL; }
if (cfg[raw_cfg_len + 2] != 1) { dev_err(&ts->client->dev, "Config fw must have Config_Fresh register set"); return -EINVAL; }
return 0;}
static void goodix_calc_cfg_checksum_16(struct goodix_ts_data *ts){ int i, raw_cfg_len = ts->chip->config_len - 3; u16 check_sum = 0;
for (i = 0; i < raw_cfg_len; i += 2) check_sum += get_unaligned_be16(&ts->config[i]); check_sum = (~check_sum) + 1;
put_unaligned_be16(check_sum, &ts->config[raw_cfg_len]); ts->config[raw_cfg_len + 2] = 1; /* Set "config_fresh" bit */}
/** * goodix_check_cfg - Checks if config fw is valid * * @ts: goodix_ts_data pointer * @cfg: firmware config data * @len: config data length */static int goodix_check_cfg(struct goodix_ts_data *ts, const u8 *cfg, int len){ if (len < GOODIX_CONFIG_MIN_LENGTH || len > GOODIX_CONFIG_MAX_LENGTH) { dev_err(&ts->client->dev, "The length of the config fw is not correct"); return -EINVAL; }
return ts->chip->check_config(ts, cfg, len);}
/** * goodix_send_cfg - Write fw config to device * * @ts: goodix_ts_data pointer * @cfg: config firmware to write to device * @len: config data length */int goodix_send_cfg(struct goodix_ts_data *ts, const u8 *cfg, int len){ int error;
error = goodix_check_cfg(ts, cfg, len); if (error) return error;
error = goodix_i2c_write(ts->client, ts->chip->config_addr, cfg, len); if (error) return error;
dev_dbg(&ts->client->dev, "Config sent successfully.");
/* Let the firmware reconfigure itself, so sleep for 10ms */ usleep_range(10000, 11000);
return 0;}
#ifdef ACPI_GPIO_SUPPORTstatic int goodix_pin_acpi_direction_input(struct goodix_ts_data *ts){ acpi_handle handle = ACPI_HANDLE(&ts->client->dev); acpi_status status;
status = acpi_evaluate_object(handle, "INTI", NULL, NULL); return ACPI_SUCCESS(status) ? 0 : -EIO;}
static int goodix_pin_acpi_output_method(struct goodix_ts_data *ts, int value){ acpi_handle handle = ACPI_HANDLE(&ts->client->dev); acpi_status status;
status = acpi_execute_simple_method(handle, "INTO", value); return ACPI_SUCCESS(status) ? 0 : -EIO;}#elsestatic int goodix_pin_acpi_direction_input(struct goodix_ts_data *ts){ dev_err(&ts->client->dev, "%s called on device without ACPI support\n", __func__); return -EINVAL;}
static int goodix_pin_acpi_output_method(struct goodix_ts_data *ts, int value){ dev_err(&ts->client->dev, "%s called on device without ACPI support\n", __func__); return -EINVAL;}#endif
static int goodix_irq_direction_output(struct goodix_ts_data *ts, int value){ switch (ts->irq_pin_access_method) { case IRQ_PIN_ACCESS_NONE: dev_err(&ts->client->dev, "%s called without an irq_pin_access_method set\n", __func__); return -EINVAL; case IRQ_PIN_ACCESS_GPIO: return gpiod_direction_output(ts->gpiod_int, value); case IRQ_PIN_ACCESS_ACPI_GPIO: /* * The IRQ pin triggers on a falling edge, so its gets marked * as active-low, use output_raw to avoid the value inversion. */ return gpiod_direction_output_raw(ts->gpiod_int, value); case IRQ_PIN_ACCESS_ACPI_METHOD: return goodix_pin_acpi_output_method(ts, value); }
return -EINVAL; /* Never reached */}
static int goodix_irq_direction_input(struct goodix_ts_data *ts){ switch (ts->irq_pin_access_method) { case IRQ_PIN_ACCESS_NONE: dev_err(&ts->client->dev, "%s called without an irq_pin_access_method set\n", __func__); return -EINVAL; case IRQ_PIN_ACCESS_GPIO: return gpiod_direction_input(ts->gpiod_int); case IRQ_PIN_ACCESS_ACPI_GPIO: return gpiod_direction_input(ts->gpiod_int); case IRQ_PIN_ACCESS_ACPI_METHOD: return goodix_pin_acpi_direction_input(ts); }
return -EINVAL; /* Never reached */}
int goodix_int_sync(struct goodix_ts_data *ts){ int error;
error = goodix_irq_direction_output(ts, 0); if (error) goto error;
msleep(50); /* T5: 50ms */
error = goodix_irq_direction_input(ts); if (error) goto error;
return 0;
error: dev_err(&ts->client->dev, "Controller irq sync failed.\n"); return error;}
/** * goodix_reset_no_int_sync - Reset device, leaving interrupt line in output mode * * @ts: goodix_ts_data pointer */int goodix_reset_no_int_sync(struct goodix_ts_data *ts){ int error;
/* begin select I2C slave addr */ error = gpiod_direction_output(ts->gpiod_rst, 0); if (error) goto error;
msleep(20); /* T2: > 10ms */
/* HIGH: 0x28/0x29, LOW: 0xBA/0xBB */ error = goodix_irq_direction_output(ts, ts->client->addr == 0x14); if (error) goto error;
usleep_range(100, 2000); /* T3: > 100us */
error = gpiod_direction_output(ts->gpiod_rst, 1); if (error) goto error;
usleep_range(6000, 10000); /* T4: > 5ms */
return 0;
error: dev_err(&ts->client->dev, "Controller reset failed.\n"); return error;}
/** * goodix_reset - Reset device during power on * * @ts: goodix_ts_data pointer */static int goodix_reset(struct goodix_ts_data *ts){ int error;
error = goodix_reset_no_int_sync(ts); if (error) return error;
return goodix_int_sync(ts);}
#ifdef ACPI_GPIO_SUPPORTstatic const struct acpi_gpio_params first_gpio = { 0, 0, false };static const struct acpi_gpio_params second_gpio = { 1, 0, false };
static const struct acpi_gpio_mapping acpi_goodix_int_first_gpios[] = { { GOODIX_GPIO_INT_NAME "-gpios", &first_gpio, 1 }, { GOODIX_GPIO_RST_NAME "-gpios", &second_gpio, 1 }, { },};
static const struct acpi_gpio_mapping acpi_goodix_int_last_gpios[] = { { GOODIX_GPIO_RST_NAME "-gpios", &first_gpio, 1 }, { GOODIX_GPIO_INT_NAME "-gpios", &second_gpio, 1 }, { },};
static const struct acpi_gpio_mapping acpi_goodix_reset_only_gpios[] = { { GOODIX_GPIO_RST_NAME "-gpios", &first_gpio, 1 }, { },};
static int goodix_resource(struct acpi_resource *ares, void *data){ struct goodix_ts_data *ts = data; struct device *dev = &ts->client->dev; struct acpi_resource_gpio *gpio;
if (acpi_gpio_get_irq_resource(ares, &gpio)) { if (ts->gpio_int_idx == -1) { ts->gpio_int_idx = ts->gpio_count; } else { dev_err(dev, "More then one GpioInt resource, ignoring ACPI GPIO resources\n"); ts->gpio_int_idx = -2; } ts->gpio_count++; } else if (acpi_gpio_get_io_resource(ares, &gpio)) ts->gpio_count++;
return 0;}
/* * This function gets called in case we fail to get the irq GPIO directly * because the ACPI tables lack GPIO-name to APCI _CRS index mappings * (no _DSD UUID daffd814-6eba-4d8c-8a91-bc9bbf4aa301 data). * In that case we add our own mapping and then goodix_get_gpio_config() * retries to get the GPIOs based on the added mapping. */static int goodix_add_acpi_gpio_mappings(struct goodix_ts_data *ts){ const struct acpi_gpio_mapping *gpio_mapping = NULL; struct device *dev = &ts->client->dev; LIST_HEAD(resources); int irq, ret;
ts->gpio_count = 0; ts->gpio_int_idx = -1; ret = acpi_dev_get_resources(ACPI_COMPANION(dev), &resources, goodix_resource, ts); if (ret < 0) { dev_err(dev, "Error getting ACPI resources: %d\n", ret); return ret; }
acpi_dev_free_resource_list(&resources);
/* * CHT devices should have a GpioInt + a regular GPIO ACPI resource. * Some CHT devices have a bug (where the also is bogus Interrupt * resource copied from a previous BYT based generation). i2c-core-acpi * will use the non-working Interrupt resource, fix this up. */ if (soc_intel_is_cht() && ts->gpio_count == 2 && ts->gpio_int_idx != -1) { irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(dev), 0); if (irq > 0 && irq != ts->client->irq) { dev_warn(dev, "Overriding IRQ %d -> %d\n", ts->client->irq, irq); ts->client->irq = irq; } }
/* Some devices with gpio_int_idx 0 list a third unused GPIO */ if ((ts->gpio_count == 2 || ts->gpio_count == 3) && ts->gpio_int_idx == 0) { ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_GPIO; gpio_mapping = acpi_goodix_int_first_gpios; } else if (ts->gpio_count == 2 && ts->gpio_int_idx == 1) { ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_GPIO; gpio_mapping = acpi_goodix_int_last_gpios; } else if (ts->gpio_count == 1 && ts->gpio_int_idx == -1 && acpi_has_method(ACPI_HANDLE(dev), "INTI") && acpi_has_method(ACPI_HANDLE(dev), "INTO")) { dev_info(dev, "Using ACPI INTI and INTO methods for IRQ pin access\n"); ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_METHOD; gpio_mapping = acpi_goodix_reset_only_gpios; } else if (soc_intel_is_byt() && ts->gpio_count == 2 && ts->gpio_int_idx == -1) { dev_info(dev, "No ACPI GpioInt resource, assuming that the GPIO order is reset, int\n"); ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_GPIO; gpio_mapping = acpi_goodix_int_last_gpios; } else if (ts->gpio_count == 1 && ts->gpio_int_idx == 0) { /* * On newer devices there is only 1 GpioInt resource and _PS0 * does the whole reset sequence for us. */ acpi_device_fix_up_power(ACPI_COMPANION(dev));
/* * Before the _PS0 call the int GPIO may have been in output * mode and the call should have put the int GPIO in input mode, * but the GPIO subsys cached state may still think it is * in output mode, causing gpiochip_lock_as_irq() failure. * * Add a mapping for the int GPIO to make the * gpiod_int = gpiod_get(..., GPIOD_IN) call succeed, * which will explicitly set the direction to input. */ ts->irq_pin_access_method = IRQ_PIN_ACCESS_NONE; gpio_mapping = acpi_goodix_int_first_gpios; } else { dev_warn(dev, "Unexpected ACPI resources: gpio_count %d, gpio_int_idx %d\n", ts->gpio_count, ts->gpio_int_idx); /* * On some devices _PS0 does a reset for us and * sometimes this is necessary for things to work. */ acpi_device_fix_up_power(ACPI_COMPANION(dev)); return -EINVAL; }
return devm_acpi_dev_add_driver_gpios(dev, gpio_mapping);}#elsestatic int goodix_add_acpi_gpio_mappings(struct goodix_ts_data *ts){ return -EINVAL;}#endif /* CONFIG_X86 && CONFIG_ACPI */
/** * goodix_get_gpio_config - Get GPIO config from ACPI/DT * * @ts: goodix_ts_data pointer */static int goodix_get_gpio_config(struct goodix_ts_data *ts){ struct device *dev; struct gpio_desc *gpiod; bool added_acpi_mappings = false;
if (!ts->client) return -EINVAL; dev = &ts->client->dev;
ts->avdd28 = devm_regulator_get(dev, "AVDD28"); if (IS_ERR(ts->avdd28)) return dev_err_probe(dev, PTR_ERR(ts->avdd28), "Failed to get AVDD28 regulator\n");
ts->vddio = devm_regulator_get(dev, "VDDIO"); if (IS_ERR(ts->vddio)) return dev_err_probe(dev, PTR_ERR(ts->vddio), "Failed to get VDDIO regulator\n");
retry_get_irq_gpio: /* Get the interrupt GPIO pin number */ gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_INT_NAME, GPIOD_IN); if (IS_ERR(gpiod)) return dev_err_probe(dev, PTR_ERR(gpiod), "Failed to get %s GPIO\n", GOODIX_GPIO_INT_NAME);
if (!gpiod && has_acpi_companion(dev) && !added_acpi_mappings) { added_acpi_mappings = true; if (goodix_add_acpi_gpio_mappings(ts) == 0) goto retry_get_irq_gpio; }
ts->gpiod_int = gpiod;
/* Get the reset line GPIO pin number */ gpiod = devm_gpiod_get_optional(dev, GOODIX_GPIO_RST_NAME, GPIOD_ASIS); if (IS_ERR(gpiod)) return dev_err_probe(dev, PTR_ERR(gpiod), "Failed to get %s GPIO\n", GOODIX_GPIO_RST_NAME);
ts->gpiod_rst = gpiod;
switch (ts->irq_pin_access_method) { case IRQ_PIN_ACCESS_ACPI_GPIO: /* * We end up here if goodix_add_acpi_gpio_mappings() has * called devm_acpi_dev_add_driver_gpios() because the ACPI * tables did not contain name to index mappings. * Check that we successfully got both GPIOs after we've * added our own acpi_gpio_mapping and if we did not get both * GPIOs reset irq_pin_access_method to IRQ_PIN_ACCESS_NONE. */ if (!ts->gpiod_int || !ts->gpiod_rst) ts->irq_pin_access_method = IRQ_PIN_ACCESS_NONE; break; case IRQ_PIN_ACCESS_ACPI_METHOD: if (!ts->gpiod_rst) ts->irq_pin_access_method = IRQ_PIN_ACCESS_NONE; break; default: if (ts->gpiod_int && ts->gpiod_rst) { ts->reset_controller_at_probe = true; ts->load_cfg_from_disk = true; ts->irq_pin_access_method = IRQ_PIN_ACCESS_GPIO; } }
return 0;}
/** * goodix_read_config - Read the embedded configuration of the panel * * @ts: our goodix_ts_data pointer * * Must be called during probe */static void goodix_read_config(struct goodix_ts_data *ts){ int x_max, y_max; int error;
/* * On controllers where we need to upload the firmware * (controllers without flash) ts->config already has the config * at this point and the controller itself does not have it yet! */ if (!ts->firmware_name) { error = goodix_i2c_read(ts->client, ts->chip->config_addr, ts->config, ts->chip->config_len); if (error) { ts->int_trigger_type = GOODIX_INT_TRIGGER; ts->max_touch_num = GOODIX_MAX_CONTACTS; return; } }
ts->int_trigger_type = ts->config[TRIGGER_LOC] & 0x03; ts->max_touch_num = min(ts->config[MAX_CONTACTS_LOC] & 0x0f, GOODIX_MAX_CONTACTS);
x_max = get_unaligned_le16(&ts->config[RESOLUTION_LOC]); y_max = get_unaligned_le16(&ts->config[RESOLUTION_LOC + 2]); if (x_max && y_max) { input_abs_set_max(ts->input_dev, ABS_MT_POSITION_X, x_max - 1); input_abs_set_max(ts->input_dev, ABS_MT_POSITION_Y, y_max - 1); }
ts->chip->calc_config_checksum(ts);}
/** * goodix_read_version - Read goodix touchscreen version * * @ts: our goodix_ts_data pointer */static int goodix_read_version(struct goodix_ts_data *ts){ int error; u8 buf[6]; char id_str[GOODIX_ID_MAX_LEN + 1];
error = goodix_i2c_read(ts->client, GOODIX_REG_ID, buf, sizeof(buf)); if (error) return error;
memcpy(id_str, buf, GOODIX_ID_MAX_LEN); id_str[GOODIX_ID_MAX_LEN] = 0; strscpy(ts->id, id_str, GOODIX_ID_MAX_LEN + 1);
ts->version = get_unaligned_le16(&buf[4]);
dev_info(&ts->client->dev, "ID %s, version: %04x\n", ts->id, ts->version);
return 0;}
/** * goodix_i2c_test - I2C test function to check if the device answers. * * @client: the i2c client */static int goodix_i2c_test(struct i2c_client *client){ int retry = 0; int error; u8 test;
while (retry++ < 2) { error = goodix_i2c_read(client, GOODIX_REG_ID, &test, 1); if (!error) return 0;
msleep(20); }
return error;}
/** * goodix_configure_dev - Finish device initialization * * @ts: our goodix_ts_data pointer * * Must be called from probe to finish initialization of the device. * Contains the common initialization code for both devices that * declare gpio pins and devices that do not. It is either called * directly from probe or from request_firmware_wait callback. */static int goodix_configure_dev(struct goodix_ts_data *ts){ int error; int i;
ts->int_trigger_type = GOODIX_INT_TRIGGER; ts->max_touch_num = GOODIX_MAX_CONTACTS;
ts->input_dev = devm_input_allocate_device(&ts->client->dev); if (!ts->input_dev) { dev_err(&ts->client->dev, "Failed to allocate input device."); return -ENOMEM; }
ts->input_dev->name = "Goodix Capacitive TouchScreen"; ts->input_dev->phys = "input/ts"; ts->input_dev->id.bustype = BUS_I2C; ts->input_dev->id.vendor = 0x0416; if (kstrtou16(ts->id, 10, &ts->input_dev->id.product)) ts->input_dev->id.product = 0x1001; ts->input_dev->id.version = ts->version;
ts->input_dev->keycode = ts->keymap; ts->input_dev->keycodesize = sizeof(ts->keymap[0]); ts->input_dev->keycodemax = GOODIX_MAX_KEYS;
/* Capacitive Windows/Home button on some devices */ for (i = 0; i < GOODIX_MAX_KEYS; ++i) { if (i == 0) ts->keymap[i] = KEY_LEFTMETA; else ts->keymap[i] = KEY_F1 + (i - 1);
input_set_capability(ts->input_dev, EV_KEY, ts->keymap[i]); }
input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_X); input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_Y); input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0); input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
retry_read_config: /* Read configuration and apply touchscreen parameters */ goodix_read_config(ts);
/* Try overriding touchscreen parameters via device properties */ touchscreen_parse_properties(ts->input_dev, true, &ts->prop);
if (!ts->prop.max_x || !ts->prop.max_y || !ts->max_touch_num) { if (!ts->reset_controller_at_probe && ts->irq_pin_access_method != IRQ_PIN_ACCESS_NONE) { dev_info(&ts->client->dev, "Config not set, resetting controller\n"); /* Retry after a controller reset */ ts->reset_controller_at_probe = true; error = goodix_reset(ts); if (error) return error; goto retry_read_config; } dev_err(&ts->client->dev, "Invalid config (%d, %d, %d), using defaults\n", ts->prop.max_x, ts->prop.max_y, ts->max_touch_num); ts->prop.max_x = GOODIX_MAX_WIDTH - 1; ts->prop.max_y = GOODIX_MAX_HEIGHT - 1; ts->max_touch_num = GOODIX_MAX_CONTACTS; input_abs_set_max(ts->input_dev, ABS_MT_POSITION_X, ts->prop.max_x); input_abs_set_max(ts->input_dev, ABS_MT_POSITION_Y, ts->prop.max_y); }
if (dmi_check_system(nine_bytes_report)) { ts->contact_size = 9;
dev_dbg(&ts->client->dev, "Non-standard 9-bytes report format quirk\n"); }
if (dmi_check_system(inverted_x_screen)) { ts->prop.invert_x = true; dev_dbg(&ts->client->dev, "Applying 'inverted x screen' quirk\n"); }
error = input_mt_init_slots(ts->input_dev, ts->max_touch_num, INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); if (error) { dev_err(&ts->client->dev, "Failed to initialize MT slots: %d", error); return error; }
input_set_drvdata(ts->input_dev, ts);
if (!ts->client->irq) { error = input_setup_polling(ts->input_dev, goodix_ts_work_i2c_poll); if (error) { dev_err(&ts->client->dev, "could not set up polling mode, %d\n", error); return error; } input_set_poll_interval(ts->input_dev, GOODIX_POLL_INTERVAL_MS); }
error = input_register_device(ts->input_dev); if (error) { dev_err(&ts->client->dev, "Failed to register input device: %d", error); return error; }
/* * Create the input_pen device before goodix_request_irq() calls * devm_request_threaded_irq() so that the devm framework frees * it after disabling the irq. * Unfortunately there is no way to detect if the touchscreen has pen * support, so registering the dev is delayed till the first pen event. */ error = goodix_create_pen_input(ts); if (error) return error;
ts->irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT; error = goodix_request_irq(ts); if (error) { dev_err(&ts->client->dev, "request IRQ failed: %d\n", error); return error; }
return 0;}
/** * goodix_config_cb - Callback to finish device init * * @cfg: firmware config * @ctx: our goodix_ts_data pointer * * request_firmware_wait callback that finishes * initialization of the device. */static void goodix_config_cb(const struct firmware *cfg, void *ctx){ struct goodix_ts_data *ts = ctx; int error;
if (ts->firmware_name) { if (!cfg) goto err_release_cfg;
error = goodix_check_cfg(ts, cfg->data, cfg->size); if (error) goto err_release_cfg;
memcpy(ts->config, cfg->data, cfg->size); } else if (cfg) { /* send device configuration to the firmware */ error = goodix_send_cfg(ts, cfg->data, cfg->size); if (error) goto err_release_cfg; }
goodix_configure_dev(ts);
err_release_cfg: release_firmware(cfg); complete_all(&ts->firmware_loading_complete);}
static void goodix_disable_regulators(void *arg){ struct goodix_ts_data *ts = arg;
regulator_disable(ts->vddio); regulator_disable(ts->avdd28);}
static int goodix_ts_probe(struct i2c_client *client){ struct goodix_ts_data *ts; const char *cfg_name; int error;
dev_dbg(&client->dev, "I2C Address: 0x%02x\n", client->addr);
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { dev_err(&client->dev, "I2C check functionality failed.\n"); return -ENXIO; }
ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL); if (!ts) return -ENOMEM;
ts->client = client; i2c_set_clientdata(client, ts); init_completion(&ts->firmware_loading_complete); ts->contact_size = GOODIX_CONTACT_SIZE;
error = goodix_get_gpio_config(ts); if (error) return error;
/* power up the controller */ error = regulator_enable(ts->avdd28); if (error) { dev_err(&client->dev, "Failed to enable AVDD28 regulator: %d\n", error); return error; }
error = regulator_enable(ts->vddio); if (error) { dev_err(&client->dev, "Failed to enable VDDIO regulator: %d\n", error); regulator_disable(ts->avdd28); return error; }
error = devm_add_action_or_reset(&client->dev, goodix_disable_regulators, ts); if (error) return error;
reset: if (ts->reset_controller_at_probe) { /* reset the controller */ error = goodix_reset(ts); if (error) return error; }
error = goodix_i2c_test(client); if (error) { if (!ts->reset_controller_at_probe && ts->irq_pin_access_method != IRQ_PIN_ACCESS_NONE) { /* Retry after a controller reset */ ts->reset_controller_at_probe = true; goto reset; } dev_err(&client->dev, "I2C communication failure: %d\n", error); return error; }
error = goodix_firmware_check(ts); if (error) return error;
error = goodix_read_version(ts); if (error) return error;
ts->chip = goodix_get_chip_data(ts->id);
if (ts->load_cfg_from_disk) { /* update device config */ error = device_property_read_string(&client->dev, "goodix,config-name", &cfg_name); if (!error) snprintf(ts->cfg_name, sizeof(ts->cfg_name), "goodix/%s", cfg_name); else snprintf(ts->cfg_name, sizeof(ts->cfg_name), "goodix_%s_cfg.bin", ts->id);
error = request_firmware_nowait(THIS_MODULE, true, ts->cfg_name, &client->dev, GFP_KERNEL, ts, goodix_config_cb); if (error) { dev_err(&client->dev, "Failed to invoke firmware loader: %d\n", error); return error; }
return 0; } else { error = goodix_configure_dev(ts); if (error) return error; }
return 0;}
static void goodix_ts_remove(struct i2c_client *client){ struct goodix_ts_data *ts = i2c_get_clientdata(client);
if (ts->load_cfg_from_disk) wait_for_completion(&ts->firmware_loading_complete);}
static int goodix_suspend(struct device *dev){ struct i2c_client *client = to_i2c_client(dev); struct goodix_ts_data *ts = i2c_get_clientdata(client); int error;
if (ts->load_cfg_from_disk) wait_for_completion(&ts->firmware_loading_complete);
/* We need gpio pins to suspend/resume */ if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_NONE) { goodix_disable_irq(ts); return 0; }
/* Free IRQ as IRQ pin is used as output in the suspend sequence */ goodix_free_irq(ts);
/* Save reference (calibration) info if necessary */ goodix_save_bak_ref(ts);
/* Output LOW on the INT pin for 5 ms */ error = goodix_irq_direction_output(ts, 0); if (error) { goodix_request_irq(ts); return error; }
usleep_range(5000, 6000);
error = goodix_i2c_write_u8(ts->client, GOODIX_REG_COMMAND, GOODIX_CMD_SCREEN_OFF); if (error) { goodix_irq_direction_input(ts); goodix_request_irq(ts); return -EAGAIN; }
/* * The datasheet specifies that the interval between sending screen-off * command and wake-up should be longer than 58 ms. To avoid waking up * sooner, delay 58ms here. */ msleep(58); return 0;}
static int goodix_resume(struct device *dev){ struct i2c_client *client = to_i2c_client(dev); struct goodix_ts_data *ts = i2c_get_clientdata(client); u8 config_ver; int error;
if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_NONE) { goodix_enable_irq(ts); return 0; }
/* * Exit sleep mode by outputting HIGH level to INT pin * for 2ms~5ms. */ error = goodix_irq_direction_output(ts, 1); if (error) return error;
usleep_range(2000, 5000);
error = goodix_int_sync(ts); if (error) return error;
error = goodix_i2c_read(ts->client, ts->chip->config_addr, &config_ver, 1); if (!error && config_ver != ts->config[0]) dev_info(dev, "Config version mismatch %d != %d, resetting controller\n", config_ver, ts->config[0]);
if (error != 0 || config_ver != ts->config[0]) { error = goodix_reset(ts); if (error) return error;
error = goodix_send_cfg(ts, ts->config, ts->chip->config_len); if (error) return error; }
error = goodix_request_irq(ts); if (error) return error;
return 0;}
static DEFINE_SIMPLE_DEV_PM_OPS(goodix_pm_ops, goodix_suspend, goodix_resume);
static const struct i2c_device_id goodix_ts_id[] = { { .name = "GDIX1001:00" }, { }};MODULE_DEVICE_TABLE(i2c, goodix_ts_id);
#ifdef CONFIG_ACPIstatic const struct acpi_device_id goodix_acpi_match[] = { { "GDIX1001", 0 }, { "GDIX1002", 0 }, { "GDIX1003", 0 }, { "GDX9110", 0 }, { }};MODULE_DEVICE_TABLE(acpi, goodix_acpi_match);#endif
#ifdef CONFIG_OFstatic const struct of_device_id goodix_of_match[] = { { .compatible = "goodix,gt1151" }, { .compatible = "goodix,gt1158" }, { .compatible = "goodix,gt5663" }, { .compatible = "goodix,gt5688" }, { .compatible = "goodix,gt911" }, { .compatible = "goodix,gt9110" }, { .compatible = "goodix,gt912" }, { .compatible = "goodix,gt9147" }, { .compatible = "goodix,gt917s" }, { .compatible = "goodix,gt927" }, { .compatible = "goodix,gt9271" }, { .compatible = "goodix,gt928" }, { .compatible = "goodix,gt9286" }, { .compatible = "goodix,gt967" }, { }};MODULE_DEVICE_TABLE(of, goodix_of_match);#endif
static struct i2c_driver goodix_ts_driver = { .probe = goodix_ts_probe, .remove = goodix_ts_remove, .id_table = goodix_ts_id, .driver = { .name = "Goodix-TS", .acpi_match_table = ACPI_PTR(goodix_acpi_match), .of_match_table = of_match_ptr(goodix_of_match), .pm = pm_sleep_ptr(&goodix_pm_ops), },};module_i2c_driver(goodix_ts_driver);
MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");MODULE_AUTHOR("Bastien Nocera <hadess@hadess.net>");MODULE_DESCRIPTION("Goodix touchscreen driver");MODULE_LICENSE("GPL v2");