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path: root/drivers/input/touchscreen/st1232.c
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Diffstat (limited to 'drivers/input/touchscreen/st1232.c')
-rw-r--r--drivers/input/touchscreen/st1232.c402
1 files changed, 402 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/st1232.c b/drivers/input/touchscreen/st1232.c
new file mode 100644
index 0000000000..6475084aee
--- /dev/null
+++ b/drivers/input/touchscreen/st1232.c
@@ -0,0 +1,402 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ST1232 Touchscreen Controller Driver
+ *
+ * Copyright (C) 2010 Renesas Solutions Corp.
+ * Tony SIM <chinyeow.sim.xt@renesas.com>
+ *
+ * Using code from:
+ * - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c
+ * Copyright (C) 2007 Google, Inc.
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pm_qos.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#define ST1232_TS_NAME "st1232-ts"
+#define ST1633_TS_NAME "st1633-ts"
+
+#define REG_STATUS 0x01 /* Device Status | Error Code */
+
+#define STATUS_NORMAL 0x00
+#define STATUS_INIT 0x01
+#define STATUS_ERROR 0x02
+#define STATUS_AUTO_TUNING 0x03
+#define STATUS_IDLE 0x04
+#define STATUS_POWER_DOWN 0x05
+
+#define ERROR_NONE 0x00
+#define ERROR_INVALID_ADDRESS 0x10
+#define ERROR_INVALID_VALUE 0x20
+#define ERROR_INVALID_PLATFORM 0x30
+
+#define REG_XY_RESOLUTION 0x04
+#define REG_XY_COORDINATES 0x12
+#define ST_TS_MAX_FINGERS 10
+
+struct st_chip_info {
+ bool have_z;
+ u16 max_area;
+ u16 max_fingers;
+};
+
+struct st1232_ts_data {
+ struct i2c_client *client;
+ struct input_dev *input_dev;
+ struct touchscreen_properties prop;
+ struct dev_pm_qos_request low_latency_req;
+ struct gpio_desc *reset_gpio;
+ const struct st_chip_info *chip_info;
+ int read_buf_len;
+ u8 *read_buf;
+};
+
+static int st1232_ts_read_data(struct st1232_ts_data *ts, u8 reg,
+ unsigned int n)
+{
+ struct i2c_client *client = ts->client;
+ struct i2c_msg msg[] = {
+ {
+ .addr = client->addr,
+ .len = sizeof(reg),
+ .buf = &reg,
+ },
+ {
+ .addr = client->addr,
+ .flags = I2C_M_RD | I2C_M_DMA_SAFE,
+ .len = n,
+ .buf = ts->read_buf,
+ }
+ };
+ int ret;
+
+ ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
+ if (ret != ARRAY_SIZE(msg))
+ return ret < 0 ? ret : -EIO;
+
+ return 0;
+}
+
+static int st1232_ts_wait_ready(struct st1232_ts_data *ts)
+{
+ unsigned int retries;
+ int error;
+
+ for (retries = 100; retries; retries--) {
+ error = st1232_ts_read_data(ts, REG_STATUS, 1);
+ if (!error) {
+ switch (ts->read_buf[0]) {
+ case STATUS_NORMAL | ERROR_NONE:
+ case STATUS_IDLE | ERROR_NONE:
+ return 0;
+ }
+ }
+
+ usleep_range(1000, 2000);
+ }
+
+ return -ENXIO;
+}
+
+static int st1232_ts_read_resolution(struct st1232_ts_data *ts, u16 *max_x,
+ u16 *max_y)
+{
+ u8 *buf;
+ int error;
+
+ /* select resolution register */
+ error = st1232_ts_read_data(ts, REG_XY_RESOLUTION, 3);
+ if (error)
+ return error;
+
+ buf = ts->read_buf;
+
+ *max_x = (((buf[0] & 0x0070) << 4) | buf[1]) - 1;
+ *max_y = (((buf[0] & 0x0007) << 8) | buf[2]) - 1;
+
+ return 0;
+}
+
+static int st1232_ts_parse_and_report(struct st1232_ts_data *ts)
+{
+ struct input_dev *input = ts->input_dev;
+ struct input_mt_pos pos[ST_TS_MAX_FINGERS];
+ u8 z[ST_TS_MAX_FINGERS];
+ int slots[ST_TS_MAX_FINGERS];
+ int n_contacts = 0;
+ int i;
+
+ for (i = 0; i < ts->chip_info->max_fingers; i++) {
+ u8 *buf = &ts->read_buf[i * 4];
+
+ if (buf[0] & BIT(7)) {
+ unsigned int x = ((buf[0] & 0x70) << 4) | buf[1];
+ unsigned int y = ((buf[0] & 0x07) << 8) | buf[2];
+
+ touchscreen_set_mt_pos(&pos[n_contacts],
+ &ts->prop, x, y);
+
+ /* st1232 includes a z-axis / touch strength */
+ if (ts->chip_info->have_z)
+ z[n_contacts] = ts->read_buf[i + 6];
+
+ n_contacts++;
+ }
+ }
+
+ input_mt_assign_slots(input, slots, pos, n_contacts, 0);
+ for (i = 0; i < n_contacts; i++) {
+ input_mt_slot(input, slots[i]);
+ input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
+ input_report_abs(input, ABS_MT_POSITION_X, pos[i].x);
+ input_report_abs(input, ABS_MT_POSITION_Y, pos[i].y);
+ if (ts->chip_info->have_z)
+ input_report_abs(input, ABS_MT_TOUCH_MAJOR, z[i]);
+ }
+
+ input_mt_sync_frame(input);
+ input_sync(input);
+
+ return n_contacts;
+}
+
+static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
+{
+ struct st1232_ts_data *ts = dev_id;
+ int count;
+ int error;
+
+ error = st1232_ts_read_data(ts, REG_XY_COORDINATES, ts->read_buf_len);
+ if (error)
+ goto out;
+
+ count = st1232_ts_parse_and_report(ts);
+ if (!count) {
+ if (ts->low_latency_req.dev) {
+ dev_pm_qos_remove_request(&ts->low_latency_req);
+ ts->low_latency_req.dev = NULL;
+ }
+ } else if (!ts->low_latency_req.dev) {
+ /* First contact, request 100 us latency. */
+ dev_pm_qos_add_ancestor_request(&ts->client->dev,
+ &ts->low_latency_req,
+ DEV_PM_QOS_RESUME_LATENCY, 100);
+ }
+
+out:
+ return IRQ_HANDLED;
+}
+
+static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron)
+{
+ if (ts->reset_gpio)
+ gpiod_set_value_cansleep(ts->reset_gpio, !poweron);
+}
+
+static void st1232_ts_power_off(void *data)
+{
+ st1232_ts_power(data, false);
+}
+
+static const struct st_chip_info st1232_chip_info = {
+ .have_z = true,
+ .max_area = 0xff,
+ .max_fingers = 2,
+};
+
+static const struct st_chip_info st1633_chip_info = {
+ .have_z = false,
+ .max_area = 0x00,
+ .max_fingers = 5,
+};
+
+static int st1232_ts_probe(struct i2c_client *client)
+{
+ const struct i2c_device_id *id = i2c_client_get_device_id(client);
+ const struct st_chip_info *match;
+ struct st1232_ts_data *ts;
+ struct input_dev *input_dev;
+ u16 max_x, max_y;
+ int error;
+
+ match = device_get_match_data(&client->dev);
+ if (!match && id)
+ match = (const void *)id->driver_data;
+ if (!match) {
+ dev_err(&client->dev, "unknown device model\n");
+ return -ENODEV;
+ }
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(&client->dev, "need I2C_FUNC_I2C\n");
+ return -EIO;
+ }
+
+ if (!client->irq) {
+ dev_err(&client->dev, "no IRQ?\n");
+ return -EINVAL;
+ }
+
+ ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
+ if (!ts)
+ return -ENOMEM;
+
+ ts->chip_info = match;
+
+ /* allocate a buffer according to the number of registers to read */
+ ts->read_buf_len = ts->chip_info->max_fingers * 4;
+ ts->read_buf = devm_kzalloc(&client->dev, ts->read_buf_len, GFP_KERNEL);
+ if (!ts->read_buf)
+ return -ENOMEM;
+
+ input_dev = devm_input_allocate_device(&client->dev);
+ if (!input_dev)
+ return -ENOMEM;
+
+ ts->client = client;
+ ts->input_dev = input_dev;
+
+ ts->reset_gpio = devm_gpiod_get_optional(&client->dev, NULL,
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(ts->reset_gpio)) {
+ error = PTR_ERR(ts->reset_gpio);
+ dev_err(&client->dev, "Unable to request GPIO pin: %d.\n",
+ error);
+ return error;
+ }
+
+ st1232_ts_power(ts, true);
+
+ error = devm_add_action_or_reset(&client->dev, st1232_ts_power_off, ts);
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to install power off action: %d\n", error);
+ return error;
+ }
+
+ input_dev->name = "st1232-touchscreen";
+ input_dev->id.bustype = BUS_I2C;
+
+ /* Wait until device is ready */
+ error = st1232_ts_wait_ready(ts);
+ if (error)
+ return error;
+
+ /* Read resolution from the chip */
+ error = st1232_ts_read_resolution(ts, &max_x, &max_y);
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to read resolution: %d\n", error);
+ return error;
+ }
+
+ if (ts->chip_info->have_z)
+ input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
+ ts->chip_info->max_area, 0, 0);
+
+ input_set_abs_params(input_dev, ABS_MT_POSITION_X,
+ 0, max_x, 0, 0);
+ input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
+ 0, max_y, 0, 0);
+
+ touchscreen_parse_properties(input_dev, true, &ts->prop);
+
+ error = input_mt_init_slots(input_dev, ts->chip_info->max_fingers,
+ INPUT_MT_DIRECT | INPUT_MT_TRACK |
+ INPUT_MT_DROP_UNUSED);
+ if (error) {
+ dev_err(&client->dev, "failed to initialize MT slots\n");
+ return error;
+ }
+
+ error = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, st1232_ts_irq_handler,
+ IRQF_ONESHOT,
+ client->name, ts);
+ if (error) {
+ dev_err(&client->dev, "Failed to register interrupt\n");
+ return error;
+ }
+
+ error = input_register_device(ts->input_dev);
+ if (error) {
+ dev_err(&client->dev, "Unable to register %s input device\n",
+ input_dev->name);
+ return error;
+ }
+
+ i2c_set_clientdata(client, ts);
+
+ return 0;
+}
+
+static int st1232_ts_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct st1232_ts_data *ts = i2c_get_clientdata(client);
+
+ disable_irq(client->irq);
+
+ if (!device_may_wakeup(&client->dev))
+ st1232_ts_power(ts, false);
+
+ return 0;
+}
+
+static int st1232_ts_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct st1232_ts_data *ts = i2c_get_clientdata(client);
+
+ if (!device_may_wakeup(&client->dev))
+ st1232_ts_power(ts, true);
+
+ enable_irq(client->irq);
+
+ return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops,
+ st1232_ts_suspend, st1232_ts_resume);
+
+static const struct i2c_device_id st1232_ts_id[] = {
+ { ST1232_TS_NAME, (unsigned long)&st1232_chip_info },
+ { ST1633_TS_NAME, (unsigned long)&st1633_chip_info },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
+
+static const struct of_device_id st1232_ts_dt_ids[] = {
+ { .compatible = "sitronix,st1232", .data = &st1232_chip_info },
+ { .compatible = "sitronix,st1633", .data = &st1633_chip_info },
+ { }
+};
+MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
+
+static struct i2c_driver st1232_ts_driver = {
+ .probe = st1232_ts_probe,
+ .id_table = st1232_ts_id,
+ .driver = {
+ .name = ST1232_TS_NAME,
+ .of_match_table = st1232_ts_dt_ids,
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+ .pm = pm_sleep_ptr(&st1232_ts_pm_ops),
+ },
+};
+
+module_i2c_driver(st1232_ts_driver);
+
+MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
+MODULE_AUTHOR("Martin Kepplinger <martin.kepplinger@ginzinger.com>");
+MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 16:49:21 +0000