// SPDX-License-Identifier: GPL-2.0-only #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define ILI2XXX_POLL_PERIOD 15 #define ILI210X_DATA_SIZE 64 #define ILI211X_DATA_SIZE 43 #define ILI251X_DATA_SIZE1 31 #define ILI251X_DATA_SIZE2 20 /* Touchscreen commands */ #define REG_TOUCHDATA 0x10 #define REG_PANEL_INFO 0x20 #define REG_FIRMWARE_VERSION 0x40 #define REG_PROTOCOL_VERSION 0x42 #define REG_KERNEL_VERSION 0x61 #define REG_IC_BUSY 0x80 #define REG_IC_BUSY_NOT_BUSY 0x50 #define REG_GET_MODE 0xc0 #define REG_GET_MODE_AP 0x5a #define REG_GET_MODE_BL 0x55 #define REG_SET_MODE_AP 0xc1 #define REG_SET_MODE_BL 0xc2 #define REG_WRITE_DATA 0xc3 #define REG_WRITE_ENABLE 0xc4 #define REG_READ_DATA_CRC 0xc7 #define REG_CALIBRATE 0xcc #define ILI251X_FW_FILENAME "ilitek/ili251x.bin" struct ili2xxx_chip { int (*read_reg)(struct i2c_client *client, u8 reg, void *buf, size_t len); int (*get_touch_data)(struct i2c_client *client, u8 *data); bool (*parse_touch_data)(const u8 *data, unsigned int finger, unsigned int *x, unsigned int *y, unsigned int *z); bool (*continue_polling)(const u8 *data, bool touch); unsigned int max_touches; unsigned int resolution; bool has_calibrate_reg; bool has_firmware_proto; bool has_pressure_reg; }; struct ili210x { struct i2c_client *client; struct input_dev *input; struct gpio_desc *reset_gpio; struct touchscreen_properties prop; const struct ili2xxx_chip *chip; u8 version_firmware[8]; u8 version_kernel[5]; u8 version_proto[2]; u8 ic_mode[2]; bool stop; }; static int ili210x_read_reg(struct i2c_client *client, u8 reg, void *buf, size_t len) { struct i2c_msg msg[] = { { .addr = client->addr, .flags = 0, .len = 1, .buf = ®, }, { .addr = client->addr, .flags = I2C_M_RD, .len = len, .buf = buf, } }; int error, ret; ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg)); if (ret != ARRAY_SIZE(msg)) { error = ret < 0 ? ret : -EIO; dev_err(&client->dev, "%s failed: %d\n", __func__, error); return error; } return 0; } static int ili210x_read_touch_data(struct i2c_client *client, u8 *data) { return ili210x_read_reg(client, REG_TOUCHDATA, data, ILI210X_DATA_SIZE); } static bool ili210x_touchdata_to_coords(const u8 *touchdata, unsigned int finger, unsigned int *x, unsigned int *y, unsigned int *z) { if (!(touchdata[0] & BIT(finger))) return false; *x = get_unaligned_be16(touchdata + 1 + (finger * 4) + 0); *y = get_unaligned_be16(touchdata + 1 + (finger * 4) + 2); return true; } static bool ili210x_check_continue_polling(const u8 *data, bool touch) { return data[0] & 0xf3; } static const struct ili2xxx_chip ili210x_chip = { .read_reg = ili210x_read_reg, .get_touch_data = ili210x_read_touch_data, .parse_touch_data = ili210x_touchdata_to_coords, .continue_polling = ili210x_check_continue_polling, .max_touches = 2, .has_calibrate_reg = true, }; static int ili211x_read_touch_data(struct i2c_client *client, u8 *data) { s16 sum = 0; int error; int ret; int i; ret = i2c_master_recv(client, data, ILI211X_DATA_SIZE); if (ret != ILI211X_DATA_SIZE) { error = ret < 0 ? ret : -EIO; dev_err(&client->dev, "%s failed: %d\n", __func__, error); return error; } /* This chip uses custom checksum at the end of data */ for (i = 0; i < ILI211X_DATA_SIZE - 1; i++) sum = (sum + data[i]) & 0xff; if ((-sum & 0xff) != data[ILI211X_DATA_SIZE - 1]) { dev_err(&client->dev, "CRC error (crc=0x%02x expected=0x%02x)\n", sum, data[ILI211X_DATA_SIZE - 1]); return -EIO; } return 0; } static bool ili211x_touchdata_to_coords(const u8 *touchdata, unsigned int finger, unsigned int *x, unsigned int *y, unsigned int *z) { u32 data; data = get_unaligned_be32(touchdata + 1 + (finger * 4) + 0); if (data == 0xffffffff) /* Finger up */ return false; *x = ((touchdata[1 + (finger * 4) + 0] & 0xf0) << 4) | touchdata[1 + (finger * 4) + 1]; *y = ((touchdata[1 + (finger * 4) + 0] & 0x0f) << 8) | touchdata[1 + (finger * 4) + 2]; return true; } static bool ili211x_decline_polling(const u8 *data, bool touch) { return false; } static const struct ili2xxx_chip ili211x_chip = { .read_reg = ili210x_read_reg, .get_touch_data = ili211x_read_touch_data, .parse_touch_data = ili211x_touchdata_to_coords, .continue_polling = ili211x_decline_polling, .max_touches = 10, .resolution = 2048, }; static bool ili212x_touchdata_to_coords(const u8 *touchdata, unsigned int finger, unsigned int *x, unsigned int *y, unsigned int *z) { u16 val; val = get_unaligned_be16(touchdata + 3 + (finger * 5) + 0); if (!(val & BIT(15))) /* Touch indication */ return false; *x = val & 0x3fff; *y = get_unaligned_be16(touchdata + 3 + (finger * 5) + 2); return true; } static bool ili212x_check_continue_polling(const u8 *data, bool touch) { return touch; } static const struct ili2xxx_chip ili212x_chip = { .read_reg = ili210x_read_reg, .get_touch_data = ili210x_read_touch_data, .parse_touch_data = ili212x_touchdata_to_coords, .continue_polling = ili212x_check_continue_polling, .max_touches = 10, .has_calibrate_reg = true, }; static int ili251x_read_reg_common(struct i2c_client *client, u8 reg, void *buf, size_t len, unsigned int delay) { int error; int ret; ret = i2c_master_send(client, ®, 1); if (ret == 1) { if (delay) usleep_range(delay, delay + 500); ret = i2c_master_recv(client, buf, len); if (ret == len) return 0; } error = ret < 0 ? ret : -EIO; dev_err(&client->dev, "%s failed: %d\n", __func__, error); return ret; } static int ili251x_read_reg(struct i2c_client *client, u8 reg, void *buf, size_t len) { return ili251x_read_reg_common(client, reg, buf, len, 5000); } static int ili251x_read_touch_data(struct i2c_client *client, u8 *data) { int error; error = ili251x_read_reg_common(client, REG_TOUCHDATA, data, ILI251X_DATA_SIZE1, 0); if (!error && data[0] == 2) { error = i2c_master_recv(client, data + ILI251X_DATA_SIZE1, ILI251X_DATA_SIZE2); if (error >= 0) error = error == ILI251X_DATA_SIZE2 ? 0 : -EIO; } return error; } static bool ili251x_touchdata_to_coords(const u8 *touchdata, unsigned int finger, unsigned int *x, unsigned int *y, unsigned int *z) { u16 val; val = get_unaligned_be16(touchdata + 1 + (finger * 5) + 0); if (!(val & BIT(15))) /* Touch indication */ return false; *x = val & 0x3fff; *y = get_unaligned_be16(touchdata + 1 + (finger * 5) + 2); *z = touchdata[1 + (finger * 5) + 4]; return true; } static bool ili251x_check_continue_polling(const u8 *data, bool touch) { return touch; } static const struct ili2xxx_chip ili251x_chip = { .read_reg = ili251x_read_reg, .get_touch_data = ili251x_read_touch_data, .parse_touch_data = ili251x_touchdata_to_coords, .continue_polling = ili251x_check_continue_polling, .max_touches = 10, .has_calibrate_reg = true, .has_firmware_proto = true, .has_pressure_reg = true, }; static bool ili210x_report_events(struct ili210x *priv, u8 *touchdata) { struct input_dev *input = priv->input; int i; bool contact = false, touch; unsigned int x = 0, y = 0, z = 0; for (i = 0; i < priv->chip->max_touches; i++) { touch = priv->chip->parse_touch_data(touchdata, i, &x, &y, &z); input_mt_slot(input, i); if (input_mt_report_slot_state(input, MT_TOOL_FINGER, touch)) { touchscreen_report_pos(input, &priv->prop, x, y, true); if (priv->chip->has_pressure_reg) input_report_abs(input, ABS_MT_PRESSURE, z); contact = true; } } input_mt_report_pointer_emulation(input, false); input_sync(input); return contact; } static irqreturn_t ili210x_irq(int irq, void *irq_data) { struct ili210x *priv = irq_data; struct i2c_client *client = priv->client; const struct ili2xxx_chip *chip = priv->chip; u8 touchdata[ILI210X_DATA_SIZE] = { 0 }; bool keep_polling; ktime_t time_next; s64 time_delta; bool touch; int error; do { time_next = ktime_add_ms(ktime_get(), ILI2XXX_POLL_PERIOD); error = chip->get_touch_data(client, touchdata); if (error) { dev_err(&client->dev, "Unable to get touch data: %d\n", error); break; } touch = ili210x_report_events(priv, touchdata); keep_polling = chip->continue_polling(touchdata, touch); if (keep_polling) { time_delta = ktime_us_delta(time_next, ktime_get()); if (time_delta > 0) usleep_range(time_delta, time_delta + 1000); } } while (!priv->stop && keep_polling); return IRQ_HANDLED; } static int ili251x_firmware_update_resolution(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct ili210x *priv = i2c_get_clientdata(client); u16 resx, resy; u8 rs[10]; int error; /* The firmware update blob might have changed the resolution. */ error = priv->chip->read_reg(client, REG_PANEL_INFO, &rs, sizeof(rs)); if (!error) { resx = le16_to_cpup((__le16 *)rs); resy = le16_to_cpup((__le16 *)(rs + 2)); /* The value reported by the firmware is invalid. */ if (!resx || resx == 0xffff || !resy || resy == 0xffff) error = -EINVAL; } /* * In case of error, the firmware might be stuck in bootloader mode, * e.g. after a failed firmware update. Set maximum resolution, but * do not fail to probe, so the user can re-trigger the firmware * update and recover the touch controller. */ if (error) { dev_warn(dev, "Invalid resolution reported by controller.\n"); resx = 16384; resy = 16384; } input_abs_set_max(priv->input, ABS_X, resx - 1); input_abs_set_max(priv->input, ABS_Y, resy - 1); input_abs_set_max(priv->input, ABS_MT_POSITION_X, resx - 1); input_abs_set_max(priv->input, ABS_MT_POSITION_Y, resy - 1); return error; } static ssize_t ili251x_firmware_update_firmware_version(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct ili210x *priv = i2c_get_clientdata(client); int error; u8 fw[8]; /* Get firmware version */ error = priv->chip->read_reg(client, REG_FIRMWARE_VERSION, &fw, sizeof(fw)); if (!error) memcpy(priv->version_firmware, fw, sizeof(fw)); return error; } static ssize_t ili251x_firmware_update_kernel_version(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct ili210x *priv = i2c_get_clientdata(client); int error; u8 kv[5]; /* Get kernel version */ error = priv->chip->read_reg(client, REG_KERNEL_VERSION, &kv, sizeof(kv)); if (!error) memcpy(priv->version_kernel, kv, sizeof(kv)); return error; } static ssize_t ili251x_firmware_update_protocol_version(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct ili210x *priv = i2c_get_clientdata(client); int error; u8 pv[2]; /* Get protocol version */ error = priv->chip->read_reg(client, REG_PROTOCOL_VERSION, &pv, sizeof(pv)); if (!error) memcpy(priv->version_proto, pv, sizeof(pv)); return error; } static ssize_t ili251x_firmware_update_ic_mode(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct ili210x *priv = i2c_get_clientdata(client); int error; u8 md[2]; /* Get chip boot mode */ error = priv->chip->read_reg(client, REG_GET_MODE, &md, sizeof(md)); if (!error) memcpy(priv->ic_mode, md, sizeof(md)); return error; } static int ili251x_firmware_update_cached_state(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct ili210x *priv = i2c_get_clientdata(client); int error; if (!priv->chip->has_firmware_proto) return 0; /* Wait for firmware to boot and stabilize itself. */ msleep(200); /* Firmware does report valid information. */ error = ili251x_firmware_update_resolution(dev); if (error) return error; error = ili251x_firmware_update_firmware_version(dev); if (error) return error; error = ili251x_firmware_update_kernel_version(dev); if (error) return error; error = ili251x_firmware_update_protocol_version(dev); if (error) return error; error = ili251x_firmware_update_ic_mode(dev); if (error) return error; return 0; } static ssize_t ili251x_firmware_version_show(struct device *dev, struct device_attribute *attr, char *buf) { struct i2c_client *client = to_i2c_client(dev); struct ili210x *priv = i2c_get_clientdata(client); u8 *fw = priv->version_firmware; return sysfs_emit(buf, "%02x%02x.%02x%02x.%02x%02x.%02x%02x\n", fw[0], fw[1], fw[2], fw[3], fw[4], fw[5], fw[6], fw[7]); } static DEVICE_ATTR(firmware_version, 0444, ili251x_firmware_version_show, NULL); static ssize_t ili251x_kernel_version_show(struct device *dev, struct device_attribute *attr, char *buf) { struct i2c_client *client = to_i2c_client(dev); struct ili210x *priv = i2c_get_clientdata(client); u8 *kv = priv->version_kernel; return sysfs_emit(buf, "%02x.%02x.%02x.%02x.%02x\n", kv[0], kv[1], kv[2], kv[3], kv[4]); } static DEVICE_ATTR(kernel_version, 0444, ili251x_kernel_version_show, NULL); static ssize_t ili251x_protocol_version_show(struct device *dev, struct device_attribute *attr, char *buf) { struct i2c_client *client = to_i2c_client(dev); struct ili210x *priv = i2c_get_clientdata(client); u8 *pv = priv->version_proto; return sysfs_emit(buf, "%02x.%02x\n", pv[0], pv[1]); } static DEVICE_ATTR(protocol_version, 0444, ili251x_protocol_version_show, NULL); static ssize_t ili251x_mode_show(struct device *dev, struct device_attribute *attr, char *buf) { struct i2c_client *client = to_i2c_client(dev); struct ili210x *priv = i2c_get_clientdata(client); u8 *md = priv->ic_mode; char *mode = "AP"; if (md[0] == REG_GET_MODE_AP) /* Application Mode */ mode = "AP"; else if (md[0] == REG_GET_MODE_BL) /* BootLoader Mode */ mode = "BL"; else /* Unknown Mode */ mode = "??"; return sysfs_emit(buf, "%02x.%02x:%s\n", md[0], md[1], mode); } static DEVICE_ATTR(mode, 0444, ili251x_mode_show, NULL); static ssize_t ili210x_calibrate(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct i2c_client *client = to_i2c_client(dev); struct ili210x *priv = i2c_get_clientdata(client); unsigned long calibrate; int rc; u8 cmd = REG_CALIBRATE; if (kstrtoul(buf, 10, &calibrate)) return -EINVAL; if (calibrate > 1) return -EINVAL; if (calibrate) { rc = i2c_master_send(priv->client, &cmd, sizeof(cmd)); if (rc != sizeof(cmd)) return -EIO; } return count; } static DEVICE_ATTR(calibrate, S_IWUSR, NULL, ili210x_calibrate); static const u8 *ili251x_firmware_to_buffer(const struct firmware *fw, u16 *ac_end, u16 *df_end) { const struct ihex_binrec *rec; u32 fw_addr, fw_last_addr = 0; u16 fw_len; /* * The firmware ihex blob can never be bigger than 64 kiB, so make this * simple -- allocate a 64 kiB buffer, iterate over the ihex blob records * once, copy them all into this buffer at the right locations, and then * do all operations on this linear buffer. */ u8* fw_buf __free(kvfree) = kvmalloc(SZ_64K, GFP_KERNEL); if (!fw_buf) return ERR_PTR(-ENOMEM); rec = (const struct ihex_binrec *)fw->data; while (rec) { fw_addr = be32_to_cpu(rec->addr); fw_len = be16_to_cpu(rec->len); /* The last 32 Byte firmware block can be 0xffe0 */ if (fw_addr + fw_len > SZ_64K || fw_addr > SZ_64K - 32) return ERR_PTR(-EFBIG); /* Find the last address before DF start address, that is AC end */ if (fw_addr == 0xf000) *ac_end = fw_last_addr; fw_last_addr = fw_addr + fw_len; memcpy(fw_buf + fw_addr, rec->data, fw_len); rec = ihex_next_binrec(rec); } /* DF end address is the last address in the firmware blob */ *df_end = fw_addr + fw_len; return_ptr(fw_buf); } /* Switch mode between Application and BootLoader */ static int ili251x_switch_ic_mode(struct i2c_client *client, u8 cmd_mode) { struct ili210x *priv = i2c_get_clientdata(client); u8 cmd_wren[3] = { REG_WRITE_ENABLE, 0x5a, 0xa5 }; u8 md[2]; int error; error = priv->chip->read_reg(client, REG_GET_MODE, md, sizeof(md)); if (error) return error; /* Mode already set */ if ((cmd_mode == REG_SET_MODE_AP && md[0] == REG_GET_MODE_AP) || (cmd_mode == REG_SET_MODE_BL && md[0] == REG_GET_MODE_BL)) return 0; /* Unlock writes */ error = i2c_master_send(client, cmd_wren, sizeof(cmd_wren)); if (error != sizeof(cmd_wren)) return -EINVAL; mdelay(20); /* Select mode (BootLoader or Application) */ error = i2c_master_send(client, &cmd_mode, 1); if (error != 1) return -EINVAL; mdelay(200); /* Reboot into bootloader takes a lot of time ... */ /* Read back mode */ error = priv->chip->read_reg(client, REG_GET_MODE, md, sizeof(md)); if (error) return error; /* Check if mode is correct now. */ if ((cmd_mode == REG_SET_MODE_AP && md[0] == REG_GET_MODE_AP) || (cmd_mode == REG_SET_MODE_BL && md[0] == REG_GET_MODE_BL)) return 0; return -EINVAL; } static int ili251x_firmware_busy(struct i2c_client *client) { struct ili210x *priv = i2c_get_clientdata(client); int error, i = 0; u8 data; do { /* The read_reg already contains suitable delay */ error = priv->chip->read_reg(client, REG_IC_BUSY, &data, 1); if (error) return error; if (i++ == 100000) return -ETIMEDOUT; } while (data != REG_IC_BUSY_NOT_BUSY); return 0; } static int ili251x_firmware_write_to_ic(struct device *dev, const u8 *fwbuf, u16 start, u16 end, u8 dataflash) { struct i2c_client *client = to_i2c_client(dev); struct ili210x *priv = i2c_get_clientdata(client); u8 cmd_crc = REG_READ_DATA_CRC; u8 crcrb[4] = { 0 }; u8 fw_data[33]; u16 fw_addr; int error; /* * The DF (dataflash) needs 2 bytes offset for unknown reasons, * the AC (application) has 2 bytes CRC16-CCITT at the end. */ u16 crc = crc_ccitt(0, fwbuf + start + (dataflash ? 2 : 0), end - start - 2); /* Unlock write to either AC (application) or DF (dataflash) area */ u8 cmd_wr[10] = { REG_WRITE_ENABLE, 0x5a, 0xa5, dataflash, (end >> 16) & 0xff, (end >> 8) & 0xff, end & 0xff, (crc >> 16) & 0xff, (crc >> 8) & 0xff, crc & 0xff }; error = i2c_master_send(client, cmd_wr, sizeof(cmd_wr)); if (error != sizeof(cmd_wr)) return -EINVAL; error = ili251x_firmware_busy(client); if (error) return error; for (fw_addr = start; fw_addr < end; fw_addr += 32) { fw_data[0] = REG_WRITE_DATA; memcpy(&(fw_data[1]), fwbuf + fw_addr, 32); error = i2c_master_send(client, fw_data, 33); if (error != sizeof(fw_data)) return error; error = ili251x_firmware_busy(client); if (error) return error; } error = i2c_master_send(client, &cmd_crc, 1); if (error != 1) return -EINVAL; error = ili251x_firmware_busy(client); if (error) return error; error = priv->chip->read_reg(client, REG_READ_DATA_CRC, &crcrb, sizeof(crcrb)); if (error) return error; /* Check CRC readback */ if ((crcrb[0] != (crc & 0xff)) || crcrb[1] != ((crc >> 8) & 0xff)) return -EINVAL; return 0; } static int ili251x_firmware_reset(struct i2c_client *client) { u8 cmd_reset[2] = { 0xf2, 0x01 }; int error; error = i2c_master_send(client, cmd_reset, sizeof(cmd_reset)); if (error != sizeof(cmd_reset)) return -EINVAL; return ili251x_firmware_busy(client); } static void ili210x_hardware_reset(struct gpio_desc *reset_gpio) { /* Reset the controller */ gpiod_set_value_cansleep(reset_gpio, 1); usleep_range(12000, 15000); gpiod_set_value_cansleep(reset_gpio, 0); msleep(300); } static int ili210x_do_firmware_update(struct ili210x *priv, const u8 *fwbuf, u16 ac_end, u16 df_end) { struct i2c_client *client = priv->client; struct device *dev = &client->dev; int error; int i; error = ili251x_firmware_reset(client); if (error) return error; /* This may not succeed on first try, so re-try a few times. */ for (i = 0; i < 5; i++) { error = ili251x_switch_ic_mode(client, REG_SET_MODE_BL); if (!error) break; } if (error) return error; dev_dbg(dev, "IC is now in BootLoader mode\n"); msleep(200); /* The bootloader seems to need some time too. */ error = ili251x_firmware_write_to_ic(dev, fwbuf, 0xf000, df_end, 1); if (error) { dev_err(dev, "DF firmware update failed, error=%d\n", error); return error; } dev_dbg(dev, "DataFlash firmware written\n"); error = ili251x_firmware_write_to_ic(dev, fwbuf, 0x2000, ac_end, 0); if (error) { dev_err(dev, "AC firmware update failed, error=%d\n", error); return error; } dev_dbg(dev, "Application firmware written\n"); /* This may not succeed on first try, so re-try a few times. */ for (i = 0; i < 5; i++) { error = ili251x_switch_ic_mode(client, REG_SET_MODE_AP); if (!error) break; } if (error) return error; dev_dbg(dev, "IC is now in Application mode\n"); error = ili251x_firmware_update_cached_state(dev); if (error) return error; return 0; } static ssize_t ili210x_firmware_update_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct i2c_client *client = to_i2c_client(dev); struct ili210x *priv = i2c_get_clientdata(client); const char *fwname = ILI251X_FW_FILENAME; u16 ac_end, df_end; int error; const struct firmware *fw __free(firmware) = NULL; error = request_ihex_firmware(&fw, fwname, dev); if (error) { dev_err(dev, "Failed to request firmware %s, error=%d\n", fwname, error); return error; } const u8* fwbuf __free(kvfree) = ili251x_firmware_to_buffer(fw, &ac_end, &df_end); error = PTR_ERR_OR_ZERO(fwbuf); if (error) return error; /* * Disable touchscreen IRQ, so that we would not get spurious touch * interrupt during firmware update, and so that the IRQ handler won't * trigger and interfere with the firmware update. There is no bit in * the touch controller to disable the IRQs during update, so we have * to do it this way here. */ scoped_guard(disable_irq, &client->irq) { dev_dbg(dev, "Firmware update started, firmware=%s\n", fwname); ili210x_hardware_reset(priv->reset_gpio); error = ili210x_do_firmware_update(priv, fwbuf, ac_end, df_end); ili210x_hardware_reset(priv->reset_gpio); dev_dbg(dev, "Firmware update ended, error=%i\n", error); } return error ?: count; } static DEVICE_ATTR(firmware_update, 0200, NULL, ili210x_firmware_update_store); static struct attribute *ili210x_attrs[] = { &dev_attr_calibrate.attr, &dev_attr_firmware_update.attr, &dev_attr_firmware_version.attr, &dev_attr_kernel_version.attr, &dev_attr_protocol_version.attr, &dev_attr_mode.attr, NULL, }; static umode_t ili210x_attributes_visible(struct kobject *kobj, struct attribute *attr, int index) { struct device *dev = kobj_to_dev(kobj); struct i2c_client *client = to_i2c_client(dev); struct ili210x *priv = i2c_get_clientdata(client); /* Calibrate is present on all ILI2xxx which have calibrate register */ if (attr == &dev_attr_calibrate.attr) return priv->chip->has_calibrate_reg ? attr->mode : 0; /* Firmware/Kernel/Protocol/BootMode is implemented only for ILI251x */ if (!priv->chip->has_firmware_proto) return 0; return attr->mode; } static const struct attribute_group ili210x_group = { .attrs = ili210x_attrs, .is_visible = ili210x_attributes_visible, }; __ATTRIBUTE_GROUPS(ili210x); static void ili210x_power_down(void *data) { struct gpio_desc *reset_gpio = data; gpiod_set_value_cansleep(reset_gpio, 1); } static void ili210x_stop(void *data) { struct ili210x *priv = data; /* Tell ISR to quit even if there is a contact. */ priv->stop = true; } static int ili210x_i2c_probe(struct i2c_client *client) { const struct i2c_device_id *id = i2c_client_get_device_id(client); struct device *dev = &client->dev; const struct ili2xxx_chip *chip; struct ili210x *priv; struct gpio_desc *reset_gpio; struct input_dev *input; int error; unsigned int max_xy; dev_dbg(dev, "Probing for ILI210X I2C Touschreen driver"); chip = device_get_match_data(dev); if (!chip && id) chip = (const struct ili2xxx_chip *)id->driver_data; if (!chip) { dev_err(&client->dev, "unknown device model\n"); return -ENODEV; } if (client->irq <= 0) { dev_err(dev, "No IRQ!\n"); return -EINVAL; } reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); if (IS_ERR(reset_gpio)) return PTR_ERR(reset_gpio); if (reset_gpio) { error = devm_add_action_or_reset(dev, ili210x_power_down, reset_gpio); if (error) return error; ili210x_hardware_reset(reset_gpio); } priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; input = devm_input_allocate_device(dev); if (!input) return -ENOMEM; priv->client = client; priv->input = input; priv->reset_gpio = reset_gpio; priv->chip = chip; i2c_set_clientdata(client, priv); /* Setup input device */ input->name = "ILI210x Touchscreen"; input->id.bustype = BUS_I2C; /* Multi touch */ max_xy = (chip->resolution ?: SZ_64K) - 1; input_set_abs_params(input, ABS_MT_POSITION_X, 0, max_xy, 0, 0); input_set_abs_params(input, ABS_MT_POSITION_Y, 0, max_xy, 0, 0); if (priv->chip->has_pressure_reg) input_set_abs_params(input, ABS_MT_PRESSURE, 0, 0xa, 0, 0); error = ili251x_firmware_update_cached_state(dev); if (error) dev_warn(dev, "Unable to cache firmware information, err: %d\n", error); touchscreen_parse_properties(input, true, &priv->prop); error = input_mt_init_slots(input, priv->chip->max_touches, INPUT_MT_DIRECT); if (error) { dev_err(dev, "Unable to set up slots, err: %d\n", error); return error; } error = devm_request_threaded_irq(dev, client->irq, NULL, ili210x_irq, IRQF_ONESHOT, client->name, priv); if (error) { dev_err(dev, "Unable to request touchscreen IRQ, err: %d\n", error); return error; } error = devm_add_action_or_reset(dev, ili210x_stop, priv); if (error) return error; error = input_register_device(priv->input); if (error) { dev_err(dev, "Cannot register input device, err: %d\n", error); return error; } return 0; } static const struct i2c_device_id ili210x_i2c_id[] = { { "ili210x", (long)&ili210x_chip }, { "ili2117", (long)&ili211x_chip }, { "ili2120", (long)&ili212x_chip }, { "ili251x", (long)&ili251x_chip }, { } }; MODULE_DEVICE_TABLE(i2c, ili210x_i2c_id); static const struct of_device_id ili210x_dt_ids[] = { { .compatible = "ilitek,ili210x", .data = &ili210x_chip }, { .compatible = "ilitek,ili2117", .data = &ili211x_chip }, { .compatible = "ilitek,ili2120", .data = &ili212x_chip }, { .compatible = "ilitek,ili251x", .data = &ili251x_chip }, { } }; MODULE_DEVICE_TABLE(of, ili210x_dt_ids); static struct i2c_driver ili210x_ts_driver = { .driver = { .name = "ili210x_i2c", .dev_groups = ili210x_groups, .of_match_table = ili210x_dt_ids, }, .id_table = ili210x_i2c_id, .probe = ili210x_i2c_probe, }; module_i2c_driver(ili210x_ts_driver); MODULE_AUTHOR("Olivier Sobrie "); MODULE_DESCRIPTION("ILI210X I2C Touchscreen Driver"); MODULE_LICENSE("GPL");