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path: root/drivers/input/touchscreen/sx8654.c
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Diffstat (limited to 'drivers/input/touchscreen/sx8654.c')
-rw-r--r--drivers/input/touchscreen/sx8654.c475
1 files changed, 475 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/sx8654.c b/drivers/input/touchscreen/sx8654.c
new file mode 100644
index 0000000000..f5c5881cef
--- /dev/null
+++ b/drivers/input/touchscreen/sx8654.c
@@ -0,0 +1,475 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for Semtech SX8654 I2C touchscreen controller.
+ *
+ * Copyright (c) 2015 Armadeus Systems
+ * Sébastien Szymanski <sebastien.szymanski@armadeus.com>
+ *
+ * Using code from:
+ * - sx865x.c
+ * Copyright (c) 2013 U-MoBo Srl
+ * Pierluigi Passaro <p.passaro@u-mobo.com>
+ * - sx8650.c
+ * Copyright (c) 2009 Wayne Roberts
+ * - tsc2007.c
+ * Copyright (c) 2008 Kwangwoo Lee
+ * - ads7846.c
+ * Copyright (c) 2005 David Brownell
+ * Copyright (c) 2006 Nokia Corporation
+ * - corgi_ts.c
+ * Copyright (C) 2004-2005 Richard Purdie
+ * - omap_ts.[hc], ads7846.h, ts_osk.c
+ * Copyright (C) 2002 MontaVista Software
+ * Copyright (C) 2004 Texas Instruments
+ * Copyright (C) 2005 Dirk Behme
+ */
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/touchscreen.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+/* register addresses */
+#define I2C_REG_TOUCH0 0x00
+#define I2C_REG_TOUCH1 0x01
+#define I2C_REG_CHANMASK 0x04
+#define I2C_REG_IRQMASK 0x22
+#define I2C_REG_IRQSRC 0x23
+#define I2C_REG_SOFTRESET 0x3f
+
+#define I2C_REG_SX8650_STAT 0x05
+#define SX8650_STAT_CONVIRQ BIT(7)
+
+/* commands */
+#define CMD_READ_REGISTER 0x40
+#define CMD_PENTRG 0xe0
+
+/* value for I2C_REG_SOFTRESET */
+#define SOFTRESET_VALUE 0xde
+
+/* bits for I2C_REG_IRQSRC */
+#define IRQ_PENTOUCH_TOUCHCONVDONE BIT(3)
+#define IRQ_PENRELEASE BIT(2)
+
+/* bits for RegTouch1 */
+#define CONDIRQ 0x20
+#define RPDNT_100K 0x00
+#define FILT_7SA 0x03
+
+/* bits for I2C_REG_CHANMASK */
+#define CONV_X BIT(7)
+#define CONV_Y BIT(6)
+
+/* coordinates rate: higher nibble of CTRL0 register */
+#define RATE_MANUAL 0x00
+#define RATE_5000CPS 0xf0
+
+/* power delay: lower nibble of CTRL0 register */
+#define POWDLY_1_1MS 0x0b
+
+/* for sx8650, as we have no pen release IRQ there: timeout in ns following the
+ * last PENIRQ after which we assume the pen is lifted.
+ */
+#define SX8650_PENIRQ_TIMEOUT msecs_to_jiffies(10)
+
+#define MAX_12BIT ((1 << 12) - 1)
+#define MAX_I2C_READ_LEN 10 /* see datasheet section 5.1.5 */
+
+/* channel definition */
+#define CH_X 0x00
+#define CH_Y 0x01
+
+struct sx865x_data {
+ u8 cmd_manual;
+ u8 chan_mask;
+ bool has_irq_penrelease;
+ bool has_reg_irqmask;
+ irq_handler_t irqh;
+};
+
+struct sx8654 {
+ struct input_dev *input;
+ struct i2c_client *client;
+ struct gpio_desc *gpio_reset;
+
+ spinlock_t lock; /* for input reporting from irq/timer */
+ struct timer_list timer;
+
+ struct touchscreen_properties props;
+
+ const struct sx865x_data *data;
+};
+
+static inline void sx865x_penrelease(struct sx8654 *ts)
+{
+ struct input_dev *input_dev = ts->input;
+
+ input_report_key(input_dev, BTN_TOUCH, 0);
+ input_sync(input_dev);
+}
+
+static void sx865x_penrelease_timer_handler(struct timer_list *t)
+{
+ struct sx8654 *ts = from_timer(ts, t, timer);
+ unsigned long flags;
+
+ spin_lock_irqsave(&ts->lock, flags);
+ sx865x_penrelease(ts);
+ spin_unlock_irqrestore(&ts->lock, flags);
+ dev_dbg(&ts->client->dev, "penrelease by timer\n");
+}
+
+static irqreturn_t sx8650_irq(int irq, void *handle)
+{
+ struct sx8654 *ts = handle;
+ struct device *dev = &ts->client->dev;
+ int len, i;
+ unsigned long flags;
+ u8 stat;
+ u16 x, y;
+ u16 ch;
+ u16 chdata;
+ __be16 data[MAX_I2C_READ_LEN / sizeof(__be16)];
+ u8 nchan = hweight32(ts->data->chan_mask);
+ u8 readlen = nchan * sizeof(*data);
+
+ stat = i2c_smbus_read_byte_data(ts->client, CMD_READ_REGISTER
+ | I2C_REG_SX8650_STAT);
+
+ if (!(stat & SX8650_STAT_CONVIRQ)) {
+ dev_dbg(dev, "%s ignore stat [0x%02x]", __func__, stat);
+ return IRQ_HANDLED;
+ }
+
+ len = i2c_master_recv(ts->client, (u8 *)data, readlen);
+ if (len != readlen) {
+ dev_dbg(dev, "ignore short recv (%d)\n", len);
+ return IRQ_HANDLED;
+ }
+
+ spin_lock_irqsave(&ts->lock, flags);
+
+ x = 0;
+ y = 0;
+ for (i = 0; i < nchan; i++) {
+ chdata = be16_to_cpu(data[i]);
+
+ if (unlikely(chdata == 0xFFFF)) {
+ dev_dbg(dev, "invalid qualified data @ %d\n", i);
+ continue;
+ } else if (unlikely(chdata & 0x8000)) {
+ dev_warn(dev, "hibit @ %d [0x%04x]\n", i, chdata);
+ continue;
+ }
+
+ ch = chdata >> 12;
+ if (ch == CH_X)
+ x = chdata & MAX_12BIT;
+ else if (ch == CH_Y)
+ y = chdata & MAX_12BIT;
+ else
+ dev_warn(dev, "unknown channel %d [0x%04x]\n", ch,
+ chdata);
+ }
+
+ touchscreen_report_pos(ts->input, &ts->props, x, y, false);
+ input_report_key(ts->input, BTN_TOUCH, 1);
+ input_sync(ts->input);
+ dev_dbg(dev, "point(%4d,%4d)\n", x, y);
+
+ mod_timer(&ts->timer, jiffies + SX8650_PENIRQ_TIMEOUT);
+ spin_unlock_irqrestore(&ts->lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t sx8654_irq(int irq, void *handle)
+{
+ struct sx8654 *sx8654 = handle;
+ int irqsrc;
+ u8 data[4];
+ unsigned int x, y;
+ int retval;
+
+ irqsrc = i2c_smbus_read_byte_data(sx8654->client,
+ CMD_READ_REGISTER | I2C_REG_IRQSRC);
+ dev_dbg(&sx8654->client->dev, "irqsrc = 0x%x", irqsrc);
+
+ if (irqsrc < 0)
+ goto out;
+
+ if (irqsrc & IRQ_PENRELEASE) {
+ dev_dbg(&sx8654->client->dev, "pen release interrupt");
+
+ input_report_key(sx8654->input, BTN_TOUCH, 0);
+ input_sync(sx8654->input);
+ }
+
+ if (irqsrc & IRQ_PENTOUCH_TOUCHCONVDONE) {
+ dev_dbg(&sx8654->client->dev, "pen touch interrupt");
+
+ retval = i2c_master_recv(sx8654->client, data, sizeof(data));
+ if (retval != sizeof(data))
+ goto out;
+
+ /* invalid data */
+ if (unlikely(data[0] & 0x80 || data[2] & 0x80))
+ goto out;
+
+ x = ((data[0] & 0xf) << 8) | (data[1]);
+ y = ((data[2] & 0xf) << 8) | (data[3]);
+
+ touchscreen_report_pos(sx8654->input, &sx8654->props, x, y,
+ false);
+ input_report_key(sx8654->input, BTN_TOUCH, 1);
+ input_sync(sx8654->input);
+
+ dev_dbg(&sx8654->client->dev, "point(%4d,%4d)\n", x, y);
+ }
+
+out:
+ return IRQ_HANDLED;
+}
+
+static int sx8654_reset(struct sx8654 *ts)
+{
+ int err;
+
+ if (ts->gpio_reset) {
+ gpiod_set_value_cansleep(ts->gpio_reset, 1);
+ udelay(2); /* Tpulse > 1µs */
+ gpiod_set_value_cansleep(ts->gpio_reset, 0);
+ } else {
+ dev_dbg(&ts->client->dev, "NRST unavailable, try softreset\n");
+ err = i2c_smbus_write_byte_data(ts->client, I2C_REG_SOFTRESET,
+ SOFTRESET_VALUE);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+static int sx8654_open(struct input_dev *dev)
+{
+ struct sx8654 *sx8654 = input_get_drvdata(dev);
+ struct i2c_client *client = sx8654->client;
+ int error;
+
+ /* enable pen trigger mode */
+ error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0,
+ RATE_5000CPS | POWDLY_1_1MS);
+ if (error) {
+ dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed");
+ return error;
+ }
+
+ error = i2c_smbus_write_byte(client, CMD_PENTRG);
+ if (error) {
+ dev_err(&client->dev, "writing command CMD_PENTRG failed");
+ return error;
+ }
+
+ enable_irq(client->irq);
+
+ return 0;
+}
+
+static void sx8654_close(struct input_dev *dev)
+{
+ struct sx8654 *sx8654 = input_get_drvdata(dev);
+ struct i2c_client *client = sx8654->client;
+ int error;
+
+ disable_irq(client->irq);
+
+ if (!sx8654->data->has_irq_penrelease)
+ del_timer_sync(&sx8654->timer);
+
+ /* enable manual mode mode */
+ error = i2c_smbus_write_byte(client, sx8654->data->cmd_manual);
+ if (error) {
+ dev_err(&client->dev, "writing command CMD_MANUAL failed");
+ return;
+ }
+
+ error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH0, RATE_MANUAL);
+ if (error) {
+ dev_err(&client->dev, "writing to I2C_REG_TOUCH0 failed");
+ return;
+ }
+}
+
+static int sx8654_probe(struct i2c_client *client)
+{
+ const struct i2c_device_id *id = i2c_client_get_device_id(client);
+ struct sx8654 *sx8654;
+ struct input_dev *input;
+ int error;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_READ_WORD_DATA))
+ return -ENXIO;
+
+ sx8654 = devm_kzalloc(&client->dev, sizeof(*sx8654), GFP_KERNEL);
+ if (!sx8654)
+ return -ENOMEM;
+
+ sx8654->gpio_reset = devm_gpiod_get_optional(&client->dev, "reset",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(sx8654->gpio_reset))
+ return dev_err_probe(&client->dev, PTR_ERR(sx8654->gpio_reset),
+ "unable to get reset-gpio\n");
+ dev_dbg(&client->dev, "got GPIO reset pin\n");
+
+ sx8654->data = device_get_match_data(&client->dev);
+ if (!sx8654->data)
+ sx8654->data = (const struct sx865x_data *)id->driver_data;
+ if (!sx8654->data) {
+ dev_err(&client->dev, "invalid or missing device data\n");
+ return -EINVAL;
+ }
+
+ if (!sx8654->data->has_irq_penrelease) {
+ dev_dbg(&client->dev, "use timer for penrelease\n");
+ timer_setup(&sx8654->timer, sx865x_penrelease_timer_handler, 0);
+ spin_lock_init(&sx8654->lock);
+ }
+
+ input = devm_input_allocate_device(&client->dev);
+ if (!input)
+ return -ENOMEM;
+
+ input->name = "SX8654 I2C Touchscreen";
+ input->id.bustype = BUS_I2C;
+ input->dev.parent = &client->dev;
+ input->open = sx8654_open;
+ input->close = sx8654_close;
+
+ __set_bit(INPUT_PROP_DIRECT, input->propbit);
+ input_set_capability(input, EV_KEY, BTN_TOUCH);
+ input_set_abs_params(input, ABS_X, 0, MAX_12BIT, 0, 0);
+ input_set_abs_params(input, ABS_Y, 0, MAX_12BIT, 0, 0);
+
+ touchscreen_parse_properties(input, false, &sx8654->props);
+
+ sx8654->client = client;
+ sx8654->input = input;
+
+ input_set_drvdata(sx8654->input, sx8654);
+
+ error = sx8654_reset(sx8654);
+ if (error) {
+ dev_err(&client->dev, "reset failed");
+ return error;
+ }
+
+ error = i2c_smbus_write_byte_data(client, I2C_REG_CHANMASK,
+ sx8654->data->chan_mask);
+ if (error) {
+ dev_err(&client->dev, "writing to I2C_REG_CHANMASK failed");
+ return error;
+ }
+
+ if (sx8654->data->has_reg_irqmask) {
+ error = i2c_smbus_write_byte_data(client, I2C_REG_IRQMASK,
+ IRQ_PENTOUCH_TOUCHCONVDONE |
+ IRQ_PENRELEASE);
+ if (error) {
+ dev_err(&client->dev, "writing I2C_REG_IRQMASK failed");
+ return error;
+ }
+ }
+
+ error = i2c_smbus_write_byte_data(client, I2C_REG_TOUCH1,
+ CONDIRQ | RPDNT_100K | FILT_7SA);
+ if (error) {
+ dev_err(&client->dev, "writing to I2C_REG_TOUCH1 failed");
+ return error;
+ }
+
+ error = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, sx8654->data->irqh,
+ IRQF_ONESHOT,
+ client->name, sx8654);
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to enable IRQ %d, error: %d\n",
+ client->irq, error);
+ return error;
+ }
+
+ /* Disable the IRQ, we'll enable it in sx8654_open() */
+ disable_irq(client->irq);
+
+ error = input_register_device(sx8654->input);
+ if (error)
+ return error;
+
+ return 0;
+}
+
+static const struct sx865x_data sx8650_data = {
+ .cmd_manual = 0xb0,
+ .has_irq_penrelease = false,
+ .has_reg_irqmask = false,
+ .chan_mask = (CONV_X | CONV_Y),
+ .irqh = sx8650_irq,
+};
+
+static const struct sx865x_data sx8654_data = {
+ .cmd_manual = 0xc0,
+ .has_irq_penrelease = true,
+ .has_reg_irqmask = true,
+ .chan_mask = (CONV_X | CONV_Y),
+ .irqh = sx8654_irq,
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id sx8654_of_match[] = {
+ {
+ .compatible = "semtech,sx8650",
+ .data = &sx8650_data,
+ }, {
+ .compatible = "semtech,sx8654",
+ .data = &sx8654_data,
+ }, {
+ .compatible = "semtech,sx8655",
+ .data = &sx8654_data,
+ }, {
+ .compatible = "semtech,sx8656",
+ .data = &sx8654_data,
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(of, sx8654_of_match);
+#endif
+
+static const struct i2c_device_id sx8654_id_table[] = {
+ { .name = "semtech_sx8650", .driver_data = (long)&sx8650_data },
+ { .name = "semtech_sx8654", .driver_data = (long)&sx8654_data },
+ { .name = "semtech_sx8655", .driver_data = (long)&sx8654_data },
+ { .name = "semtech_sx8656", .driver_data = (long)&sx8654_data },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, sx8654_id_table);
+
+static struct i2c_driver sx8654_driver = {
+ .driver = {
+ .name = "sx8654",
+ .of_match_table = of_match_ptr(sx8654_of_match),
+ },
+ .id_table = sx8654_id_table,
+ .probe = sx8654_probe,
+};
+module_i2c_driver(sx8654_driver);
+
+MODULE_AUTHOR("Sébastien Szymanski <sebastien.szymanski@armadeus.com>");
+MODULE_DESCRIPTION("Semtech SX8654 I2C Touchscreen Driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-08 01:28:33 +0000