From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/input/touchscreen/himax_hx83112b.c | 364 +++++++++++++++++++++++++++++ 1 file changed, 364 insertions(+) create mode 100644 drivers/input/touchscreen/himax_hx83112b.c (limited to 'drivers/input/touchscreen/himax_hx83112b.c') diff --git a/drivers/input/touchscreen/himax_hx83112b.c b/drivers/input/touchscreen/himax_hx83112b.c new file mode 100644 index 0000000000..4f6609dcde --- /dev/null +++ b/drivers/input/touchscreen/himax_hx83112b.c @@ -0,0 +1,364 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for Himax hx83112b touchscreens + * + * Copyright (C) 2022 Job Noorman + * + * This code is based on "Himax Android Driver Sample Code for QCT platform": + * + * Copyright (C) 2017 Himax Corporation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define HIMAX_ID_83112B 0x83112b + +#define HIMAX_MAX_POINTS 10 + +#define HIMAX_REG_CFG_SET_ADDR 0x00 +#define HIMAX_REG_CFG_INIT_READ 0x0c +#define HIMAX_REG_CFG_READ_VALUE 0x08 +#define HIMAX_REG_READ_EVENT 0x30 + +#define HIMAX_CFG_PRODUCT_ID 0x900000d0 + +#define HIMAX_INVALID_COORD 0xffff + +struct himax_event_point { + __be16 x; + __be16 y; +} __packed; + +struct himax_event { + struct himax_event_point points[HIMAX_MAX_POINTS]; + u8 majors[HIMAX_MAX_POINTS]; + u8 pad0[2]; + u8 num_points; + u8 pad1[2]; + u8 checksum_fix; +} __packed; + +static_assert(sizeof(struct himax_event) == 56); + +struct himax_ts_data { + struct gpio_desc *gpiod_rst; + struct input_dev *input_dev; + struct i2c_client *client; + struct regmap *regmap; + struct touchscreen_properties props; +}; + +static const struct regmap_config himax_regmap_config = { + .reg_bits = 8, + .val_bits = 32, + .val_format_endian = REGMAP_ENDIAN_LITTLE, +}; + +static int himax_read_config(struct himax_ts_data *ts, u32 address, u32 *dst) +{ + int error; + + error = regmap_write(ts->regmap, HIMAX_REG_CFG_SET_ADDR, address); + if (error) + return error; + + error = regmap_write(ts->regmap, HIMAX_REG_CFG_INIT_READ, 0x0); + if (error) + return error; + + error = regmap_read(ts->regmap, HIMAX_REG_CFG_READ_VALUE, dst); + if (error) + return error; + + return 0; +} + +static void himax_reset(struct himax_ts_data *ts) +{ + gpiod_set_value_cansleep(ts->gpiod_rst, 1); + + /* Delay copied from downstream driver */ + msleep(20); + gpiod_set_value_cansleep(ts->gpiod_rst, 0); + + /* + * The downstream driver doesn't contain this delay but is seems safer + * to include it. The range is just a guess that seems to work well. + */ + usleep_range(1000, 1100); +} + +static int himax_read_product_id(struct himax_ts_data *ts, u32 *product_id) +{ + int error; + + error = himax_read_config(ts, HIMAX_CFG_PRODUCT_ID, product_id); + if (error) + return error; + + *product_id >>= 8; + return 0; +} + +static int himax_check_product_id(struct himax_ts_data *ts) +{ + int error; + u32 product_id; + + error = himax_read_product_id(ts, &product_id); + if (error) + return error; + + dev_dbg(&ts->client->dev, "Product id: %x\n", product_id); + + switch (product_id) { + case HIMAX_ID_83112B: + return 0; + + default: + dev_err(&ts->client->dev, + "Unknown product id: %x\n", product_id); + return -EINVAL; + } +} + +static int himax_input_register(struct himax_ts_data *ts) +{ + int error; + + ts->input_dev = devm_input_allocate_device(&ts->client->dev); + if (!ts->input_dev) { + dev_err(&ts->client->dev, "Failed to allocate input device\n"); + return -ENOMEM; + } + + ts->input_dev->name = "Himax Touchscreen"; + + 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, 200, 0, 0); + input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 200, 0, 0); + + touchscreen_parse_properties(ts->input_dev, true, &ts->props); + + error = input_mt_init_slots(ts->input_dev, HIMAX_MAX_POINTS, + INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); + if (error) { + dev_err(&ts->client->dev, + "Failed to initialize MT slots: %d\n", error); + return error; + } + + error = input_register_device(ts->input_dev); + if (error) { + dev_err(&ts->client->dev, + "Failed to register input device: %d\n", error); + return error; + } + + return 0; +} + +static u8 himax_event_get_num_points(const struct himax_event *event) +{ + if (event->num_points == 0xff) + return 0; + else + return event->num_points & 0x0f; +} + +static bool himax_process_event_point(struct himax_ts_data *ts, + const struct himax_event *event, + int point_index) +{ + const struct himax_event_point *point = &event->points[point_index]; + u16 x = be16_to_cpu(point->x); + u16 y = be16_to_cpu(point->y); + u8 w = event->majors[point_index]; + + if (x == HIMAX_INVALID_COORD || y == HIMAX_INVALID_COORD) + return false; + + input_mt_slot(ts->input_dev, point_index); + input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true); + touchscreen_report_pos(ts->input_dev, &ts->props, x, y, true); + input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, w); + input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, w); + return true; +} + +static void himax_process_event(struct himax_ts_data *ts, + const struct himax_event *event) +{ + int i; + int num_points_left = himax_event_get_num_points(event); + + for (i = 0; i < HIMAX_MAX_POINTS && num_points_left > 0; i++) { + if (himax_process_event_point(ts, event, i)) + num_points_left--; + } + + input_mt_sync_frame(ts->input_dev); + input_sync(ts->input_dev); +} + +static bool himax_verify_checksum(struct himax_ts_data *ts, + const struct himax_event *event) +{ + u8 *data = (u8 *)event; + int i; + u16 checksum = 0; + + for (i = 0; i < sizeof(*event); i++) + checksum += data[i]; + + if ((checksum & 0x00ff) != 0) { + dev_err(&ts->client->dev, "Wrong event checksum: %04x\n", + checksum); + return false; + } + + return true; +} + +static int himax_handle_input(struct himax_ts_data *ts) +{ + int error; + struct himax_event event; + + error = regmap_raw_read(ts->regmap, HIMAX_REG_READ_EVENT, &event, + sizeof(event)); + if (error) { + dev_err(&ts->client->dev, "Failed to read input event: %d\n", + error); + return error; + } + + /* + * Only process the current event when it has a valid checksum but + * don't consider it a fatal error when it doesn't. + */ + if (himax_verify_checksum(ts, &event)) + himax_process_event(ts, &event); + + return 0; +} + +static irqreturn_t himax_irq_handler(int irq, void *dev_id) +{ + int error; + struct himax_ts_data *ts = dev_id; + + error = himax_handle_input(ts); + if (error) + return IRQ_NONE; + + return IRQ_HANDLED; +} + +static int himax_probe(struct i2c_client *client) +{ + int error; + struct device *dev = &client->dev; + struct himax_ts_data *ts; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { + dev_err(dev, "I2C check functionality failed\n"); + return -ENXIO; + } + + ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL); + if (!ts) + return -ENOMEM; + + i2c_set_clientdata(client, ts); + ts->client = client; + + ts->regmap = devm_regmap_init_i2c(client, &himax_regmap_config); + error = PTR_ERR_OR_ZERO(ts->regmap); + if (error) { + dev_err(dev, "Failed to initialize regmap: %d\n", error); + return error; + } + + ts->gpiod_rst = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); + error = PTR_ERR_OR_ZERO(ts->gpiod_rst); + if (error) { + dev_err(dev, "Failed to get reset GPIO: %d\n", error); + return error; + } + + himax_reset(ts); + + error = himax_check_product_id(ts); + if (error) + return error; + + error = himax_input_register(ts); + if (error) + return error; + + error = devm_request_threaded_irq(dev, client->irq, NULL, + himax_irq_handler, IRQF_ONESHOT, + client->name, ts); + if (error) + return error; + + return 0; +} + +static int himax_suspend(struct device *dev) +{ + struct himax_ts_data *ts = dev_get_drvdata(dev); + + disable_irq(ts->client->irq); + return 0; +} + +static int himax_resume(struct device *dev) +{ + struct himax_ts_data *ts = dev_get_drvdata(dev); + + enable_irq(ts->client->irq); + return 0; +} + +static DEFINE_SIMPLE_DEV_PM_OPS(himax_pm_ops, himax_suspend, himax_resume); + +static const struct i2c_device_id himax_ts_id[] = { + { "hx83112b", 0 }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(i2c, himax_ts_id); + +#ifdef CONFIG_OF +static const struct of_device_id himax_of_match[] = { + { .compatible = "himax,hx83112b" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, himax_of_match); +#endif + +static struct i2c_driver himax_ts_driver = { + .probe = himax_probe, + .id_table = himax_ts_id, + .driver = { + .name = "Himax-hx83112b-TS", + .of_match_table = of_match_ptr(himax_of_match), + .pm = pm_sleep_ptr(&himax_pm_ops), + }, +}; +module_i2c_driver(himax_ts_driver); + +MODULE_AUTHOR("Job Noorman "); +MODULE_DESCRIPTION("Himax hx83112b touchscreen driver"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3