| /* |
| * Copyright (c) 2010, 2011 Fabien Marteau <fabien.marteau@armadeus.com> |
| * Sponsored by ARMadeus Systems |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| * 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 = { |
| client->addr, I2C_M_IGNORE_NAK, 2, (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] = { |
| { client->addr, I2C_M_REV_DIR_ADDR, 1, (uint8_t *)data }, |
| { client->addr, I2C_M_RD | I2C_M_NOSTART, 1, (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 __devinit 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 __devinit 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 = client->dev.platform_data; |
| 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_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; |
| |
| __set_bit(EV_KEY, input_dev->evbit); |
| __set_bit(EV_ABS, input_dev->evbit); |
| __set_bit(BTN_JOYSTICK, input_dev->keybit); |
| |
| 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"); |
| 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, |
| "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, |
| "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 int __devexit 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); |
| |
| return 0; |
| } |
| |
| 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 = __devexit_p(as5011_remove), |
| .id_table = as5011_id, |
| }; |
| |
| static int __init as5011_init(void) |
| { |
| return i2c_add_driver(&as5011_driver); |
| } |
| module_init(as5011_init); |
| |
| static void __exit as5011_exit(void) |
| { |
| i2c_del_driver(&as5011_driver); |
| } |
| module_exit(as5011_exit); |