--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Driver for ChipOne icn8505 i2c touchscreen controller
+ *
+ * Copyright (c) 2015-2018 Red Hat Inc.
+ *
+ * Red Hat authors:
+ * Hans de Goede <hdegoede@redhat.com>
+ */
+
+#include <asm/unaligned.h>
+#include <linux/acpi.h>
+#include <linux/crc32.h>
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/module.h>
+
+/* Normal operation mode defines */
+#define ICN8505_REG_ADDR_WIDTH 16
+
+#define ICN8505_REG_POWER 0x0004
+#define ICN8505_REG_TOUCHDATA 0x1000
+#define ICN8505_REG_CONFIGDATA 0x8000
+
+/* ICN8505_REG_POWER commands */
+#define ICN8505_POWER_ACTIVE 0x00
+#define ICN8505_POWER_MONITOR 0x01
+#define ICN8505_POWER_HIBERNATE 0x02
+/*
+ * The Android driver uses these to turn on/off the charger filter, but the
+ * filter is way too aggressive making e.g. onscreen keyboards unusable.
+ */
+#define ICN8505_POWER_ENA_CHARGER_MODE 0x55
+#define ICN8505_POWER_DIS_CHARGER_MODE 0x66
+
+#define ICN8505_MAX_TOUCHES 10
+
+/* Programming mode defines */
+#define ICN8505_PROG_I2C_ADDR 0x30
+#define ICN8505_PROG_REG_ADDR_WIDTH 24
+
+#define MAX_FW_UPLOAD_TRIES 3
+
+struct icn8505_touch {
+ u8 slot;
+ u8 x[2];
+ u8 y[2];
+ u8 pressure; /* Seems more like finger width then pressure really */
+ u8 event;
+/* The difference between 2 and 3 is unclear */
+#define ICN8505_EVENT_NO_DATA 1 /* No finger seen yet since wakeup */
+#define ICN8505_EVENT_UPDATE1 2 /* New or updated coordinates */
+#define ICN8505_EVENT_UPDATE2 3 /* New or updated coordinates */
+#define ICN8505_EVENT_END 4 /* Finger lifted */
+} __packed;
+
+struct icn8505_touch_data {
+ u8 softbutton;
+ u8 touch_count;
+ struct icn8505_touch touches[ICN8505_MAX_TOUCHES];
+} __packed;
+
+struct icn8505_data {
+ struct i2c_client *client;
+ struct input_dev *input;
+ struct gpio_desc *wake_gpio;
+ struct touchscreen_properties prop;
+ char firmware_name[32];
+};
+
+static int icn8505_read_xfer(struct i2c_client *client, u16 i2c_addr,
+ int reg_addr, int reg_addr_width,
+ void *data, int len, bool silent)
+{
+ u8 buf[3];
+ int i, ret;
+ struct i2c_msg msg[2] = {
+ {
+ .addr = i2c_addr,
+ .buf = buf,
+ .len = reg_addr_width / 8,
+ },
+ {
+ .addr = i2c_addr,
+ .flags = I2C_M_RD,
+ .buf = data,
+ .len = len,
+ }
+ };
+
+ for (i = 0; i < (reg_addr_width / 8); i++)
+ buf[i] = (reg_addr >> (reg_addr_width - (i + 1) * 8)) & 0xff;
+
+ ret = i2c_transfer(client->adapter, msg, 2);
+ if (ret != ARRAY_SIZE(msg)) {
+ if (ret >= 0)
+ ret = -EIO;
+ if (!silent)
+ dev_err(&client->dev,
+ "Error reading addr %#x reg %#x: %d\n",
+ i2c_addr, reg_addr, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int icn8505_write_xfer(struct i2c_client *client, u16 i2c_addr,
+ int reg_addr, int reg_addr_width,
+ const void *data, int len, bool silent)
+{
+ u8 buf[3 + 32]; /* 3 bytes for 24 bit reg-addr + 32 bytes max len */
+ int i, ret;
+ struct i2c_msg msg = {
+ .addr = i2c_addr,
+ .buf = buf,
+ .len = reg_addr_width / 8 + len,
+ };
+
+ if (WARN_ON(len > 32))
+ return -EINVAL;
+
+ for (i = 0; i < (reg_addr_width / 8); i++)
+ buf[i] = (reg_addr >> (reg_addr_width - (i + 1) * 8)) & 0xff;
+
+ memcpy(buf + reg_addr_width / 8, data, len);
+
+ ret = i2c_transfer(client->adapter, &msg, 1);
+ if (ret != 1) {
+ if (ret >= 0)
+ ret = -EIO;
+ if (!silent)
+ dev_err(&client->dev,
+ "Error writing addr %#x reg %#x: %d\n",
+ i2c_addr, reg_addr, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int icn8505_read_data(struct icn8505_data *icn8505, int reg,
+ void *buf, int len)
+{
+ return icn8505_read_xfer(icn8505->client, icn8505->client->addr, reg,
+ ICN8505_REG_ADDR_WIDTH, buf, len, false);
+}
+
+static int icn8505_read_reg_silent(struct icn8505_data *icn8505, int reg)
+{
+ u8 buf;
+ int error;
+
+ error = icn8505_read_xfer(icn8505->client, icn8505->client->addr, reg,
+ ICN8505_REG_ADDR_WIDTH, &buf, 1, true);
+ if (error)
+ return error;
+
+ return buf;
+}
+
+static int icn8505_write_reg(struct icn8505_data *icn8505, int reg, u8 val)
+{
+ return icn8505_write_xfer(icn8505->client, icn8505->client->addr, reg,
+ ICN8505_REG_ADDR_WIDTH, &val, 1, false);
+}
+
+static int icn8505_read_prog_data(struct icn8505_data *icn8505, int reg,
+ void *buf, int len)
+{
+ return icn8505_read_xfer(icn8505->client, ICN8505_PROG_I2C_ADDR, reg,
+ ICN8505_PROG_REG_ADDR_WIDTH, buf, len, false);
+}
+
+static int icn8505_write_prog_data(struct icn8505_data *icn8505, int reg,
+ const void *buf, int len)
+{
+ return icn8505_write_xfer(icn8505->client, ICN8505_PROG_I2C_ADDR, reg,
+ ICN8505_PROG_REG_ADDR_WIDTH, buf, len, false);
+}
+
+static int icn8505_write_prog_reg(struct icn8505_data *icn8505, int reg, u8 val)
+{
+ return icn8505_write_xfer(icn8505->client, ICN8505_PROG_I2C_ADDR, reg,
+ ICN8505_PROG_REG_ADDR_WIDTH, &val, 1, false);
+}
+
+/*
+ * Note this function uses a number of magic register addresses and values,
+ * there are deliberately no defines for these because the algorithm is taken
+ * from the icn85xx Android driver and I do not want to make up possibly wrong
+ * names for the addresses and/or values.
+ */
+static int icn8505_try_fw_upload(struct icn8505_data *icn8505,
+ const struct firmware *fw)
+{
+ struct device *dev = &icn8505->client->dev;
+ size_t offset, count;
+ int error;
+ u8 buf[4];
+ u32 crc;
+
+ /* Put the controller in programming mode */
+ error = icn8505_write_prog_reg(icn8505, 0xcc3355, 0x5a);
+ if (error)
+ return error;
+
+ usleep_range(2000, 5000);
+
+ error = icn8505_write_prog_reg(icn8505, 0x040400, 0x01);
+ if (error)
+ return error;
+
+ usleep_range(2000, 5000);
+
+ error = icn8505_read_prog_data(icn8505, 0x040002, buf, 1);
+ if (error)
+ return error;
+
+ if (buf[0] != 0x85) {
+ dev_err(dev, "Failed to enter programming mode\n");
+ return -ENODEV;
+ }
+
+ usleep_range(1000, 5000);
+
+ /* Enable CRC mode */
+ error = icn8505_write_prog_reg(icn8505, 0x40028, 1);
+ if (error)
+ return error;
+
+ /* Send the firmware to SRAM */
+ for (offset = 0; offset < fw->size; offset += count) {
+ count = min_t(size_t, fw->size - offset, 32);
+ error = icn8505_write_prog_data(icn8505, offset,
+ fw->data + offset, count);
+ if (error)
+ return error;
+ }
+
+ /* Disable CRC mode */
+ error = icn8505_write_prog_reg(icn8505, 0x40028, 0);
+ if (error)
+ return error;
+
+ /* Get and check length and CRC */
+ error = icn8505_read_prog_data(icn8505, 0x40034, buf, 2);
+ if (error)
+ return error;
+
+ if (get_unaligned_le16(buf) != fw->size) {
+ dev_warn(dev, "Length mismatch after uploading fw\n");
+ return -EIO;
+ }
+
+ error = icn8505_read_prog_data(icn8505, 0x4002c, buf, 4);
+ if (error)
+ return error;
+
+ crc = crc32_be(0, fw->data, fw->size);
+ if (get_unaligned_le32(buf) != crc) {
+ dev_warn(dev, "CRC mismatch after uploading fw\n");
+ return -EIO;
+ }
+
+ /* Boot controller from SRAM */
+ error = icn8505_write_prog_reg(icn8505, 0x40400, 0x03);
+ if (error)
+ return error;
+
+ usleep_range(2000, 5000);
+ return 0;
+}
+
+static int icn8505_upload_fw(struct icn8505_data *icn8505)
+{
+ struct device *dev = &icn8505->client->dev;
+ const struct firmware *fw;
+ int i, error;
+
+ /*
+ * Always load the firmware, even if we don't need it at boot, we
+ * we may need it at resume. Having loaded it once will make the
+ * firmware class code cache it at suspend/resume.
+ */
+ error = request_firmware(&fw, icn8505->firmware_name, dev);
+ if (error) {
+ dev_err(dev, "Firmware request error %d\n", error);
+ return error;
+ }
+
+ /* Check if the controller is not already up and running */
+ if (icn8505_read_reg_silent(icn8505, 0x000a) == 0x85)
+ goto success;
+
+ for (i = 1; i <= MAX_FW_UPLOAD_TRIES; i++) {
+ error = icn8505_try_fw_upload(icn8505, fw);
+ if (!error)
+ goto success;
+
+ dev_err(dev, "Failed to upload firmware: %d (attempt %d/%d)\n",
+ error, i, MAX_FW_UPLOAD_TRIES);
+ usleep_range(2000, 5000);
+ }
+
+success:
+ release_firmware(fw);
+ return error;
+}
+
+static bool icn8505_touch_active(u8 event)
+{
+ return event == ICN8505_EVENT_UPDATE1 ||
+ event == ICN8505_EVENT_UPDATE2;
+}
+
+static irqreturn_t icn8505_irq(int irq, void *dev_id)
+{
+ struct icn8505_data *icn8505 = dev_id;
+ struct device *dev = &icn8505->client->dev;
+ struct icn8505_touch_data touch_data;
+ int i, error;
+
+ error = icn8505_read_data(icn8505, ICN8505_REG_TOUCHDATA,
+ &touch_data, sizeof(touch_data));
+ if (error) {
+ dev_err(dev, "Error reading touch data: %d\n", error);
+ return IRQ_HANDLED;
+ }
+
+ if (touch_data.touch_count > ICN8505_MAX_TOUCHES) {
+ dev_warn(dev, "Too many touches %d > %d\n",
+ touch_data.touch_count, ICN8505_MAX_TOUCHES);
+ touch_data.touch_count = ICN8505_MAX_TOUCHES;
+ }
+
+ for (i = 0; i < touch_data.touch_count; i++) {
+ struct icn8505_touch *touch = &touch_data.touches[i];
+ bool act = icn8505_touch_active(touch->event);
+
+ input_mt_slot(icn8505->input, touch->slot);
+ input_mt_report_slot_state(icn8505->input, MT_TOOL_FINGER, act);
+ if (!act)
+ continue;
+
+ touchscreen_report_pos(icn8505->input, &icn8505->prop,
+ get_unaligned_le16(touch->x),
+ get_unaligned_le16(touch->y),
+ true);
+ }
+
+ input_mt_sync_frame(icn8505->input);
+ input_report_key(icn8505->input, KEY_LEFTMETA,
+ touch_data.softbutton == 1);
+ input_sync(icn8505->input);
+
+ return IRQ_HANDLED;
+}
+
+static int icn8505_probe_acpi(struct icn8505_data *icn8505, struct device *dev)
+{
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ const char *subsys = "unknown";
+ struct acpi_device *adev;
+ union acpi_object *obj;
+ acpi_status status;
+
+ adev = ACPI_COMPANION(dev);
+ if (!adev)
+ return -ENODEV;
+
+ status = acpi_evaluate_object(adev->handle, "_SUB", NULL, &buffer);
+ if (ACPI_SUCCESS(status)) {
+ obj = buffer.pointer;
+ if (obj->type == ACPI_TYPE_STRING)
+ subsys = obj->string.pointer;
+ else
+ dev_warn(dev, "Warning ACPI _SUB did not return a string\n");
+ } else {
+ dev_warn(dev, "Warning ACPI _SUB failed: %#x\n", status);
+ buffer.pointer = NULL;
+ }
+
+ snprintf(icn8505->firmware_name, sizeof(icn8505->firmware_name),
+ "chipone/icn8505-%s.fw", subsys);
+
+ kfree(buffer.pointer);
+ return 0;
+}
+
+static int icn8505_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct icn8505_data *icn8505;
+ struct input_dev *input;
+ __le16 resolution[2];
+ int error;
+
+ if (!client->irq) {
+ dev_err(dev, "No irq specified\n");
+ return -EINVAL;
+ }
+
+ icn8505 = devm_kzalloc(dev, sizeof(*icn8505), GFP_KERNEL);
+ if (!icn8505)
+ return -ENOMEM;
+
+ input = devm_input_allocate_device(dev);
+ if (!input)
+ return -ENOMEM;
+
+ input->name = client->name;
+ input->id.bustype = BUS_I2C;
+
+ input_set_capability(input, EV_ABS, ABS_MT_POSITION_X);
+ input_set_capability(input, EV_ABS, ABS_MT_POSITION_Y);
+ input_set_capability(input, EV_KEY, KEY_LEFTMETA);
+
+ icn8505->client = client;
+ icn8505->input = input;
+ input_set_drvdata(input, icn8505);
+
+ error = icn8505_probe_acpi(icn8505, dev);
+ if (error)
+ return error;
+
+ error = icn8505_upload_fw(icn8505);
+ if (error)
+ return error;
+
+ error = icn8505_read_data(icn8505, ICN8505_REG_CONFIGDATA,
+ resolution, sizeof(resolution));
+ if (error) {
+ dev_err(dev, "Error reading resolution: %d\n", error);
+ return error;
+ }
+
+ input_set_abs_params(input, ABS_MT_POSITION_X, 0,
+ le16_to_cpu(resolution[0]) - 1, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_Y, 0,
+ le16_to_cpu(resolution[1]) - 1, 0, 0);
+
+ touchscreen_parse_properties(input, true, &icn8505->prop);
+ if (!input_abs_get_max(input, ABS_MT_POSITION_X) ||
+ !input_abs_get_max(input, ABS_MT_POSITION_Y)) {
+ dev_err(dev, "Error touchscreen-size-x and/or -y missing\n");
+ return -EINVAL;
+ }
+
+ error = input_mt_init_slots(input, ICN8505_MAX_TOUCHES,
+ INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+ if (error)
+ return error;
+
+ error = devm_request_threaded_irq(dev, client->irq, NULL, icn8505_irq,
+ IRQF_ONESHOT, client->name, icn8505);
+ if (error) {
+ dev_err(dev, "Error requesting irq: %d\n", error);
+ return error;
+ }
+
+ error = input_register_device(input);
+ if (error)
+ return error;
+
+ i2c_set_clientdata(client, icn8505);
+ return 0;
+}
+
+static int __maybe_unused icn8505_suspend(struct device *dev)
+{
+ struct icn8505_data *icn8505 = i2c_get_clientdata(to_i2c_client(dev));
+
+ disable_irq(icn8505->client->irq);
+
+ icn8505_write_reg(icn8505, ICN8505_REG_POWER, ICN8505_POWER_HIBERNATE);
+
+ return 0;
+}
+
+static int __maybe_unused icn8505_resume(struct device *dev)
+{
+ struct icn8505_data *icn8505 = i2c_get_clientdata(to_i2c_client(dev));
+ int error;
+
+ error = icn8505_upload_fw(icn8505);
+ if (error)
+ return error;
+
+ enable_irq(icn8505->client->irq);
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(icn8505_pm_ops, icn8505_suspend, icn8505_resume);
+
+static const struct acpi_device_id icn8505_acpi_match[] = {
+ { "CHPN0001" },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, icn8505_acpi_match);
+
+static struct i2c_driver icn8505_driver = {
+ .driver = {
+ .name = "chipone_icn8505",
+ .pm = &icn8505_pm_ops,
+ .acpi_match_table = icn8505_acpi_match,
+ },
+ .probe_new = icn8505_probe,
+};
+
+module_i2c_driver(icn8505_driver);
+
+MODULE_DESCRIPTION("ChipOne icn8505 I2C Touchscreen Driver");
+MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
+MODULE_LICENSE("GPL");
projects / linux-2.6-block.git / commitdiff