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path: root/drivers/input/joystick/as5011.c
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Diffstat (limited to 'drivers/input/joystick/as5011.c')
-rw-r--r--drivers/input/joystick/as5011.c357
1 files changed, 357 insertions, 0 deletions
diff --git a/drivers/input/joystick/as5011.c b/drivers/input/joystick/as5011.c
new file mode 100644
index 000000000..2beda2902
--- /dev/null
+++ b/drivers/input/joystick/as5011.c
@@ -0,0 +1,357 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2010, 2011 Fabien Marteau <fabien.marteau@armadeus.com>
+ * Sponsored by ARMadeus Systems
+ *
+ * Driver for Austria Microsystems joysticks AS5011
+ *
+ * TODO:
+ * - Power on the chip when open() and power down when close()
+ * - Manage power mode
+ */
+
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/input.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/input/as5011.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+#define DRIVER_DESC "Driver for Austria Microsystems AS5011 joystick"
+#define MODULE_DEVICE_ALIAS "as5011"
+
+MODULE_AUTHOR("Fabien Marteau <fabien.marteau@armadeus.com>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+
+/* registers */
+#define AS5011_CTRL1 0x76
+#define AS5011_CTRL2 0x75
+#define AS5011_XP 0x43
+#define AS5011_XN 0x44
+#define AS5011_YP 0x53
+#define AS5011_YN 0x54
+#define AS5011_X_REG 0x41
+#define AS5011_Y_REG 0x42
+#define AS5011_X_RES_INT 0x51
+#define AS5011_Y_RES_INT 0x52
+
+/* CTRL1 bits */
+#define AS5011_CTRL1_LP_PULSED 0x80
+#define AS5011_CTRL1_LP_ACTIVE 0x40
+#define AS5011_CTRL1_LP_CONTINUE 0x20
+#define AS5011_CTRL1_INT_WUP_EN 0x10
+#define AS5011_CTRL1_INT_ACT_EN 0x08
+#define AS5011_CTRL1_EXT_CLK_EN 0x04
+#define AS5011_CTRL1_SOFT_RST 0x02
+#define AS5011_CTRL1_DATA_VALID 0x01
+
+/* CTRL2 bits */
+#define AS5011_CTRL2_EXT_SAMPLE_EN 0x08
+#define AS5011_CTRL2_RC_BIAS_ON 0x04
+#define AS5011_CTRL2_INV_SPINNING 0x02
+
+#define AS5011_MAX_AXIS 80
+#define AS5011_MIN_AXIS (-80)
+#define AS5011_FUZZ 8
+#define AS5011_FLAT 40
+
+struct as5011_device {
+ struct input_dev *input_dev;
+ struct i2c_client *i2c_client;
+ unsigned int button_gpio;
+ unsigned int button_irq;
+ unsigned int axis_irq;
+};
+
+static int as5011_i2c_write(struct i2c_client *client,
+ uint8_t aregaddr,
+ uint8_t avalue)
+{
+ uint8_t data[2] = { aregaddr, avalue };
+ struct i2c_msg msg = {
+ .addr = client->addr,
+ .flags = I2C_M_IGNORE_NAK,
+ .len = 2,
+ .buf = (uint8_t *)data
+ };
+ int error;
+
+ error = i2c_transfer(client->adapter, &msg, 1);
+ return error < 0 ? error : 0;
+}
+
+static int as5011_i2c_read(struct i2c_client *client,
+ uint8_t aregaddr, signed char *value)
+{
+ uint8_t data[2] = { aregaddr };
+ struct i2c_msg msg_set[2] = {
+ {
+ .addr = client->addr,
+ .flags = I2C_M_REV_DIR_ADDR,
+ .len = 1,
+ .buf = (uint8_t *)data
+ },
+ {
+ .addr = client->addr,
+ .flags = I2C_M_RD | I2C_M_NOSTART,
+ .len = 1,
+ .buf = (uint8_t *)data
+ }
+ };
+ int error;
+
+ error = i2c_transfer(client->adapter, msg_set, 2);
+ if (error < 0)
+ return error;
+
+ *value = data[0] & 0x80 ? -1 * (1 + ~data[0]) : data[0];
+ return 0;
+}
+
+static irqreturn_t as5011_button_interrupt(int irq, void *dev_id)
+{
+ struct as5011_device *as5011 = dev_id;
+ int val = gpio_get_value_cansleep(as5011->button_gpio);
+
+ input_report_key(as5011->input_dev, BTN_JOYSTICK, !val);
+ input_sync(as5011->input_dev);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t as5011_axis_interrupt(int irq, void *dev_id)
+{
+ struct as5011_device *as5011 = dev_id;
+ int error;
+ signed char x, y;
+
+ error = as5011_i2c_read(as5011->i2c_client, AS5011_X_RES_INT, &x);
+ if (error < 0)
+ goto out;
+
+ error = as5011_i2c_read(as5011->i2c_client, AS5011_Y_RES_INT, &y);
+ if (error < 0)
+ goto out;
+
+ input_report_abs(as5011->input_dev, ABS_X, x);
+ input_report_abs(as5011->input_dev, ABS_Y, y);
+ input_sync(as5011->input_dev);
+
+out:
+ return IRQ_HANDLED;
+}
+
+static int as5011_configure_chip(struct as5011_device *as5011,
+ const struct as5011_platform_data *plat_dat)
+{
+ struct i2c_client *client = as5011->i2c_client;
+ int error;
+ signed char value;
+
+ /* chip soft reset */
+ error = as5011_i2c_write(client, AS5011_CTRL1,
+ AS5011_CTRL1_SOFT_RST);
+ if (error < 0) {
+ dev_err(&client->dev, "Soft reset failed\n");
+ return error;
+ }
+
+ mdelay(10);
+
+ error = as5011_i2c_write(client, AS5011_CTRL1,
+ AS5011_CTRL1_LP_PULSED |
+ AS5011_CTRL1_LP_ACTIVE |
+ AS5011_CTRL1_INT_ACT_EN);
+ if (error < 0) {
+ dev_err(&client->dev, "Power config failed\n");
+ return error;
+ }
+
+ error = as5011_i2c_write(client, AS5011_CTRL2,
+ AS5011_CTRL2_INV_SPINNING);
+ if (error < 0) {
+ dev_err(&client->dev, "Can't invert spinning\n");
+ return error;
+ }
+
+ /* write threshold */
+ error = as5011_i2c_write(client, AS5011_XP, plat_dat->xp);
+ if (error < 0) {
+ dev_err(&client->dev, "Can't write threshold\n");
+ return error;
+ }
+
+ error = as5011_i2c_write(client, AS5011_XN, plat_dat->xn);
+ if (error < 0) {
+ dev_err(&client->dev, "Can't write threshold\n");
+ return error;
+ }
+
+ error = as5011_i2c_write(client, AS5011_YP, plat_dat->yp);
+ if (error < 0) {
+ dev_err(&client->dev, "Can't write threshold\n");
+ return error;
+ }
+
+ error = as5011_i2c_write(client, AS5011_YN, plat_dat->yn);
+ if (error < 0) {
+ dev_err(&client->dev, "Can't write threshold\n");
+ return error;
+ }
+
+ /* to free irq gpio in chip */
+ error = as5011_i2c_read(client, AS5011_X_RES_INT, &value);
+ if (error < 0) {
+ dev_err(&client->dev, "Can't read i2c X resolution value\n");
+ return error;
+ }
+
+ return 0;
+}
+
+static int as5011_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ const struct as5011_platform_data *plat_data;
+ struct as5011_device *as5011;
+ struct input_dev *input_dev;
+ int irq;
+ int error;
+
+ plat_data = dev_get_platdata(&client->dev);
+ if (!plat_data)
+ return -EINVAL;
+
+ if (!plat_data->axis_irq) {
+ dev_err(&client->dev, "No axis IRQ?\n");
+ return -EINVAL;
+ }
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_NOSTART |
+ I2C_FUNC_PROTOCOL_MANGLING)) {
+ dev_err(&client->dev,
+ "need i2c bus that supports protocol mangling\n");
+ return -ENODEV;
+ }
+
+ as5011 = kmalloc(sizeof(struct as5011_device), GFP_KERNEL);
+ input_dev = input_allocate_device();
+ if (!as5011 || !input_dev) {
+ dev_err(&client->dev,
+ "Can't allocate memory for device structure\n");
+ error = -ENOMEM;
+ goto err_free_mem;
+ }
+
+ as5011->i2c_client = client;
+ as5011->input_dev = input_dev;
+ as5011->button_gpio = plat_data->button_gpio;
+ as5011->axis_irq = plat_data->axis_irq;
+
+ input_dev->name = "Austria Microsystem as5011 joystick";
+ input_dev->id.bustype = BUS_I2C;
+ input_dev->dev.parent = &client->dev;
+
+ input_set_capability(input_dev, EV_KEY, BTN_JOYSTICK);
+
+ input_set_abs_params(input_dev, ABS_X,
+ AS5011_MIN_AXIS, AS5011_MAX_AXIS, AS5011_FUZZ, AS5011_FLAT);
+ input_set_abs_params(as5011->input_dev, ABS_Y,
+ AS5011_MIN_AXIS, AS5011_MAX_AXIS, AS5011_FUZZ, AS5011_FLAT);
+
+ error = gpio_request(as5011->button_gpio, "AS5011 button");
+ if (error < 0) {
+ dev_err(&client->dev, "Failed to request button gpio\n");
+ goto err_free_mem;
+ }
+
+ irq = gpio_to_irq(as5011->button_gpio);
+ if (irq < 0) {
+ dev_err(&client->dev,
+ "Failed to get irq number for button gpio\n");
+ error = irq;
+ goto err_free_button_gpio;
+ }
+
+ as5011->button_irq = irq;
+
+ error = request_threaded_irq(as5011->button_irq,
+ NULL, as5011_button_interrupt,
+ IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ "as5011_button", as5011);
+ if (error < 0) {
+ dev_err(&client->dev,
+ "Can't allocate button irq %d\n", as5011->button_irq);
+ goto err_free_button_gpio;
+ }
+
+ error = as5011_configure_chip(as5011, plat_data);
+ if (error)
+ goto err_free_button_irq;
+
+ error = request_threaded_irq(as5011->axis_irq, NULL,
+ as5011_axis_interrupt,
+ plat_data->axis_irqflags | IRQF_ONESHOT,
+ "as5011_joystick", as5011);
+ if (error) {
+ dev_err(&client->dev,
+ "Can't allocate axis irq %d\n", plat_data->axis_irq);
+ goto err_free_button_irq;
+ }
+
+ error = input_register_device(as5011->input_dev);
+ if (error) {
+ dev_err(&client->dev, "Failed to register input device\n");
+ goto err_free_axis_irq;
+ }
+
+ i2c_set_clientdata(client, as5011);
+
+ return 0;
+
+err_free_axis_irq:
+ free_irq(as5011->axis_irq, as5011);
+err_free_button_irq:
+ free_irq(as5011->button_irq, as5011);
+err_free_button_gpio:
+ gpio_free(as5011->button_gpio);
+err_free_mem:
+ input_free_device(input_dev);
+ kfree(as5011);
+
+ return error;
+}
+
+static void as5011_remove(struct i2c_client *client)
+{
+ struct as5011_device *as5011 = i2c_get_clientdata(client);
+
+ free_irq(as5011->axis_irq, as5011);
+ free_irq(as5011->button_irq, as5011);
+ gpio_free(as5011->button_gpio);
+
+ input_unregister_device(as5011->input_dev);
+ kfree(as5011);
+}
+
+static const struct i2c_device_id as5011_id[] = {
+ { MODULE_DEVICE_ALIAS, 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, as5011_id);
+
+static struct i2c_driver as5011_driver = {
+ .driver = {
+ .name = "as5011",
+ },
+ .probe = as5011_probe,
+ .remove = as5011_remove,
+ .id_table = as5011_id,
+};
+
+module_i2c_driver(as5011_driver);