#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
#include <linux/irq.h>
#include <linux/regulator/consumer.h>
#include <linux/regmap.h>
#include <linux/unaligned.h>
#define HY46XX_CHKSUM_CODE 0x1
#define HY46XX_FINGER_NUM 0x2
#define HY46XX_CHKSUM_LEN 0x7
#define HY46XX_THRESHOLD 0x80
#define HY46XX_GLOVE_EN 0x84
#define HY46XX_REPORT_SPEED 0x88
#define HY46XX_PWR_NOISE_EN 0x89
#define HY46XX_FILTER_DATA 0x8A
#define HY46XX_GAIN 0x92
#define HY46XX_EDGE_OFFSET 0x93
#define HY46XX_RX_NR_USED 0x94
#define HY46XX_TX_NR_USED 0x95
#define HY46XX_PWR_MODE 0xA5
#define HY46XX_FW_VERSION 0xA6
#define HY46XX_LIB_VERSION 0xA7
#define HY46XX_TP_INFO 0xA8
#define HY46XX_TP_CHIP_ID 0xA9
#define HY46XX_BOOT_VER 0xB0
#define HY46XX_TPLEN 0x6
#define HY46XX_REPORT_PKT_LEN 0x44
#define HY46XX_MAX_SUPPORTED_POINTS 11
#define TOUCH_EVENT_DOWN 0x00
#define TOUCH_EVENT_UP 0x01
#define TOUCH_EVENT_CONTACT 0x02
#define TOUCH_EVENT_RESERVED 0x03
struct hycon_hy46xx_data {
struct i2c_client *client;
struct input_dev *input;
struct touchscreen_properties prop;
struct regulator *vcc;
struct gpio_desc *reset_gpio;
struct mutex mutex;
struct regmap *regmap;
int threshold;
bool glove_enable;
int report_speed;
bool noise_filter_enable;
int filter_data;
int gain;
int edge_offset;
int rx_number_used;
int tx_number_used;
int power_mode;
int fw_version;
int lib_version;
int tp_information;
int tp_chip_id;
int bootloader_version;
};
static const struct regmap_config hycon_hy46xx_i2c_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
static bool hycon_hy46xx_check_checksum(struct hycon_hy46xx_data *tsdata, u8 *buf)
{
u8 chksum = 0;
int i;
for (i = 2; i < buf[HY46XX_CHKSUM_LEN]; i++)
chksum += buf[i];
if (chksum == buf[HY46XX_CHKSUM_CODE])
return true;
dev_err_ratelimited(&tsdata->client->dev,
"checksum error: 0x%02x expected, got 0x%02x\n",
chksum, buf[HY46XX_CHKSUM_CODE]);
return false;
}
static irqreturn_t hycon_hy46xx_isr(int irq, void *dev_id)
{
struct hycon_hy46xx_data *tsdata = dev_id;
struct device *dev = &tsdata->client->dev;
u8 rdbuf[HY46XX_REPORT_PKT_LEN];
int i, x, y, id;
int error;
memset(rdbuf, 0, sizeof(rdbuf));
error = regmap_bulk_read(tsdata->regmap, 0, rdbuf, sizeof(rdbuf));
if (error) {
dev_err_ratelimited(dev, "Unable to fetch data, error: %d\n",
error);
goto out;
}
if (!hycon_hy46xx_check_checksum(tsdata, rdbuf))
goto out;
for (i = 0; i < HY46XX_MAX_SUPPORTED_POINTS; i++) {
u8 *buf = &rdbuf[3 + (HY46XX_TPLEN * i)];
int type = buf[0] >> 6;
if (type == TOUCH_EVENT_RESERVED)
continue;
x = get_unaligned_be16(buf) & 0x0fff;
y = get_unaligned_be16(buf + 2) & 0x0fff;
id = buf[2] >> 4;
input_mt_slot(tsdata->input, id);
if (input_mt_report_slot_state(tsdata->input, MT_TOOL_FINGER,
type != TOUCH_EVENT_UP))
touchscreen_report_pos(tsdata->input, &tsdata->prop,
x, y, true);
}
input_mt_report_pointer_emulation(tsdata->input, false);
input_sync(tsdata->input);
out:
return IRQ_HANDLED;
}
struct hycon_hy46xx_attribute {
struct device_attribute dattr;
size_t field_offset;
u8 address;
u8 limit_low;
u8 limit_high;
};
#define HYCON_ATTR_U8(_field, _mode, _address, _limit_low, _limit_high) \
struct hycon_hy46xx_attribute hycon_hy46xx_attr_##_field = { \
.dattr = __ATTR(_field, _mode, \
hycon_hy46xx_setting_show, \
hycon_hy46xx_setting_store), \
.field_offset = offsetof(struct hycon_hy46xx_data, _field), \
.address = _address, \
.limit_low = _limit_low, \
.limit_high = _limit_high, \
}
#define HYCON_ATTR_BOOL(_field, _mode, _address) \
struct hycon_hy46xx_attribute hycon_hy46xx_attr_##_field = { \
.dattr = __ATTR(_field, _mode, \
hycon_hy46xx_setting_show, \
hycon_hy46xx_setting_store), \
.field_offset = offsetof(struct hycon_hy46xx_data, _field), \
.address = _address, \
.limit_low = false, \
.limit_high = true, \
}
static ssize_t hycon_hy46xx_setting_show(struct device *dev,
struct device_attribute *dattr, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct hycon_hy46xx_data *tsdata = i2c_get_clientdata(client);
struct hycon_hy46xx_attribute *attr =
container_of(dattr, struct hycon_hy46xx_attribute, dattr);
u8 *field = (u8 *)tsdata + attr->field_offset;
size_t count = 0;
int error = 0;
int val;
mutex_lock(&tsdata->mutex);
error = regmap_read(tsdata->regmap, attr->address, &val);
if (error < 0) {
dev_err(&tsdata->client->dev,
"Failed to fetch attribute %s, error %d\n",
dattr->attr.name, error);
goto out;
}
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 = sysfs_emit(buf, "%d\n", val);
out:
mutex_unlock(&tsdata->mutex);
return error ?: count;
}
static ssize_t hycon_hy46xx_setting_store(struct device *dev,
struct device_attribute *dattr,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct hycon_hy46xx_data *tsdata = i2c_get_clientdata(client);
struct hycon_hy46xx_attribute *attr =
container_of(dattr, struct hycon_hy46xx_attribute, dattr);
u8 *field = (u8 *)tsdata + attr->field_offset;
unsigned int val;
int error;
mutex_lock(&tsdata->mutex);
error = kstrtouint(buf, 0, &val);
if (error)
goto out;
if (val < attr->limit_low || val > attr->limit_high) {
error = -ERANGE;
goto out;
}
error = regmap_write(tsdata->regmap, attr->address, val);
if (error < 0) {
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;
}
static HYCON_ATTR_U8(threshold, 0644, HY46XX_THRESHOLD, 0, 255);
static HYCON_ATTR_BOOL(glove_enable, 0644, HY46XX_GLOVE_EN);
static HYCON_ATTR_U8(report_speed, 0644, HY46XX_REPORT_SPEED, 0, 255);
static HYCON_ATTR_BOOL(noise_filter_enable, 0644, HY46XX_PWR_NOISE_EN);
static HYCON_ATTR_U8(filter_data, 0644, HY46XX_FILTER_DATA, 0, 5);
static HYCON_ATTR_U8(gain, 0644, HY46XX_GAIN, 0, 5);
static HYCON_ATTR_U8(edge_offset, 0644, HY46XX_EDGE_OFFSET, 0, 5);
static HYCON_ATTR_U8(fw_version, 0444, HY46XX_FW_VERSION, 0, 255);
static HYCON_ATTR_U8(lib_version, 0444, HY46XX_LIB_VERSION, 0, 255);
static HYCON_ATTR_U8(tp_information, 0444, HY46XX_TP_INFO, 0, 255);
static HYCON_ATTR_U8(tp_chip_id, 0444, HY46XX_TP_CHIP_ID, 0, 255);
static HYCON_ATTR_U8(bootloader_version, 0444, HY46XX_BOOT_VER, 0, 255);
static struct attribute *hycon_hy46xx_attrs[] = {
&hycon_hy46xx_attr_threshold.dattr.attr,
&hycon_hy46xx_attr_glove_enable.dattr.attr,
&hycon_hy46xx_attr_report_speed.dattr.attr,
&hycon_hy46xx_attr_noise_filter_enable.dattr.attr,
&hycon_hy46xx_attr_filter_data.dattr.attr,
&hycon_hy46xx_attr_gain.dattr.attr,
&hycon_hy46xx_attr_edge_offset.dattr.attr,
&hycon_hy46xx_attr_fw_version.dattr.attr,
&hycon_hy46xx_attr_lib_version.dattr.attr,
&hycon_hy46xx_attr_tp_information.dattr.attr,
&hycon_hy46xx_attr_tp_chip_id.dattr.attr,
&hycon_hy46xx_attr_bootloader_version.dattr.attr,
NULL
};
ATTRIBUTE_GROUPS(hycon_hy46xx);
static void hycon_hy46xx_get_defaults(struct device *dev, struct hycon_hy46xx_data *tsdata)
{
bool val_bool;
int error;
u32 val;
error = device_property_read_u32(dev, "hycon,threshold", &val);
if (!error) {
error = regmap_write(tsdata->regmap, HY46XX_THRESHOLD, val);
if (error < 0)
goto out;
tsdata->threshold = val;
}
val_bool = device_property_read_bool(dev, "hycon,glove-enable");
error = regmap_write(tsdata->regmap, HY46XX_GLOVE_EN, val_bool);
if (error < 0)
goto out;
tsdata->glove_enable = val_bool;
error = device_property_read_u32(dev, "hycon,report-speed-hz", &val);
if (!error) {
error = regmap_write(tsdata->regmap, HY46XX_REPORT_SPEED, val);
if (error < 0)
goto out;
tsdata->report_speed = val;
}
val_bool = device_property_read_bool(dev, "hycon,noise-filter-enable");
error = regmap_write(tsdata->regmap, HY46XX_PWR_NOISE_EN, val_bool);
if (error < 0)
goto out;
tsdata->noise_filter_enable = val_bool;
error = device_property_read_u32(dev, "hycon,filter-data", &val);
if (!error) {
error = regmap_write(tsdata->regmap, HY46XX_FILTER_DATA, val);
if (error < 0)
goto out;
tsdata->filter_data = val;
}
error = device_property_read_u32(dev, "hycon,gain", &val);
if (!error) {
error = regmap_write(tsdata->regmap, HY46XX_GAIN, val);
if (error < 0)
goto out;
tsdata->gain = val;
}
error = device_property_read_u32(dev, "hycon,edge-offset", &val);
if (!error) {
error = regmap_write(tsdata->regmap, HY46XX_EDGE_OFFSET, val);
if (error < 0)
goto out;
tsdata->edge_offset = val;
}
return;
out:
dev_err(&tsdata->client->dev, "Failed to set default settings");
}
static void hycon_hy46xx_get_parameters(struct hycon_hy46xx_data *tsdata)
{
int error;
u32 val;
error = regmap_read(tsdata->regmap, HY46XX_THRESHOLD, &val);
if (error < 0)
goto out;
tsdata->threshold = val;
error = regmap_read(tsdata->regmap, HY46XX_GLOVE_EN, &val);
if (error < 0)
goto out;
tsdata->glove_enable = val;
error = regmap_read(tsdata->regmap, HY46XX_REPORT_SPEED, &val);
if (error < 0)
goto out;
tsdata->report_speed = val;
error = regmap_read(tsdata->regmap, HY46XX_PWR_NOISE_EN, &val);
if (error < 0)
goto out;
tsdata->noise_filter_enable = val;
error = regmap_read(tsdata->regmap, HY46XX_FILTER_DATA, &val);
if (error < 0)
goto out;
tsdata->filter_data = val;
error = regmap_read(tsdata->regmap, HY46XX_GAIN, &val);
if (error < 0)
goto out;
tsdata->gain = val;
error = regmap_read(tsdata->regmap, HY46XX_EDGE_OFFSET, &val);
if (error < 0)
goto out;
tsdata->edge_offset = val;
error = regmap_read(tsdata->regmap, HY46XX_RX_NR_USED, &val);
if (error < 0)
goto out;
tsdata->rx_number_used = val;
error = regmap_read(tsdata->regmap, HY46XX_TX_NR_USED, &val);
if (error < 0)
goto out;
tsdata->tx_number_used = val;
error = regmap_read(tsdata->regmap, HY46XX_PWR_MODE, &val);
if (error < 0)
goto out;
tsdata->power_mode = val;
error = regmap_read(tsdata->regmap, HY46XX_FW_VERSION, &val);
if (error < 0)
goto out;
tsdata->fw_version = val;
error = regmap_read(tsdata->regmap, HY46XX_LIB_VERSION, &val);
if (error < 0)
goto out;
tsdata->lib_version = val;
error = regmap_read(tsdata->regmap, HY46XX_TP_INFO, &val);
if (error < 0)
goto out;
tsdata->tp_information = val;
error = regmap_read(tsdata->regmap, HY46XX_TP_CHIP_ID, &val);
if (error < 0)
goto out;
tsdata->tp_chip_id = val;
error = regmap_read(tsdata->regmap, HY46XX_BOOT_VER, &val);
if (error < 0)
goto out;
tsdata->bootloader_version = val;
return;
out:
dev_err(&tsdata->client->dev, "Failed to read default settings");
}
static void hycon_hy46xx_disable_regulator(void *arg)
{
struct hycon_hy46xx_data *data = arg;
regulator_disable(data->vcc);
}
static int hycon_hy46xx_probe(struct i2c_client *client)
{
struct hycon_hy46xx_data *tsdata;
struct input_dev *input;
int error;
dev_dbg(&client->dev, "probing for HYCON HY46XX I2C\n");
tsdata = devm_kzalloc(&client->dev, sizeof(*tsdata), GFP_KERNEL);
if (!tsdata)
return -ENOMEM;
tsdata->vcc = devm_regulator_get(&client->dev, "vcc");
if (IS_ERR(tsdata->vcc)) {
error = PTR_ERR(tsdata->vcc);
if (error != -EPROBE_DEFER)
dev_err(&client->dev,
"failed to request regulator: %d\n", error);
return error;
}
error = regulator_enable(tsdata->vcc);
if (error < 0) {
dev_err(&client->dev, "failed to enable vcc: %d\n", error);
return error;
}
error = devm_add_action_or_reset(&client->dev,
hycon_hy46xx_disable_regulator,
tsdata);
if (error)
return error;
tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev,
"reset", GPIOD_OUT_LOW);
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;
}
if (tsdata->reset_gpio) {
usleep_range(5000, 6000);
gpiod_set_value_cansleep(tsdata->reset_gpio, 1);
usleep_range(5000, 6000);
gpiod_set_value_cansleep(tsdata->reset_gpio, 0);
msleep(1000);
}
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->regmap = devm_regmap_init_i2c(client,
&hycon_hy46xx_i2c_regmap_config);
if (IS_ERR(tsdata->regmap)) {
dev_err(&client->dev, "regmap allocation failed\n");
return PTR_ERR(tsdata->regmap);
}
hycon_hy46xx_get_defaults(&client->dev, tsdata);
hycon_hy46xx_get_parameters(tsdata);
input->name = "Hycon Capacitive Touch";
input->id.bustype = BUS_I2C;
input->dev.parent = &client->dev;
input_set_abs_params(input, ABS_MT_POSITION_X, 0, -1, 0, 0);
input_set_abs_params(input, ABS_MT_POSITION_Y, 0, -1, 0, 0);
touchscreen_parse_properties(input, true, &tsdata->prop);
error = input_mt_init_slots(input, HY46XX_MAX_SUPPORTED_POINTS,
INPUT_MT_DIRECT);
if (error) {
dev_err(&client->dev, "Unable to init MT slots.\n");
return error;
}
i2c_set_clientdata(client, tsdata);
error = devm_request_threaded_irq(&client->dev, client->irq,
NULL, hycon_hy46xx_isr, IRQF_ONESHOT,
client->name, tsdata);
if (error) {
dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
return error;
}
error = input_register_device(input);
if (error)
return error;
dev_dbg(&client->dev,
"HYCON HY46XX initialized: IRQ %d, Reset pin %d.\n",
client->irq,
tsdata->reset_gpio ? desc_to_gpio(tsdata->reset_gpio) : -1);
return 0;
}
static const struct i2c_device_id hycon_hy46xx_id[] = {
{ .name = "hy4613" },
{ .name = "hy4614" },
{ .name = "hy4621" },
{ .name = "hy4623" },
{ .name = "hy4633" },
{ .name = "hy4635" },
{ }
};
MODULE_DEVICE_TABLE(i2c, hycon_hy46xx_id);
static const struct of_device_id hycon_hy46xx_of_match[] = {
{ .compatible = "hycon,hy4613" },
{ .compatible = "hycon,hy4614" },
{ .compatible = "hycon,hy4621" },
{ .compatible = "hycon,hy4623" },
{ .compatible = "hycon,hy4633" },
{ .compatible = "hycon,hy4635" },
{ }
};
MODULE_DEVICE_TABLE(of, hycon_hy46xx_of_match);
static struct i2c_driver hycon_hy46xx_driver = {
.driver = {
.name = "hycon_hy46xx",
.dev_groups = hycon_hy46xx_groups,
.of_match_table = hycon_hy46xx_of_match,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.id_table = hycon_hy46xx_id,
.probe = hycon_hy46xx_probe,
};
module_i2c_driver(hycon_hy46xx_driver);
MODULE_AUTHOR("Giulio Benetti <giulio.benetti@benettiengineering.com>");
MODULE_DESCRIPTION("HYCON HY46XX I2C Touchscreen Driver");
MODULE_LICENSE("GPL v2");
