| Message ID | 20110504091043.32677.62360.stgit@bob.linux.org.uk (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 05/04/11 10:11, Alan Cox wrote: > (Forgot to refresh the patch before posting the last copy) > Hi Alan, Given I didn't even notice the no irq error handling was wrong, my Ack of this still stands ;) (assuming there are no other changes?) > -- > > From: Joseph Lai <joseph_lai@wistron.com> > > This driver is registered as an input device. An IRQ is required in this > basic driver configuration. > > Signed-off-by: Joseph Lai <joseph_lai@wistron.com> > [Cleaned up PM_RUNTIME defines] > [Revised version with corrected no IRQ error handling] > Signed-off-by: Alan Cox <alan@linux.intel.com> > --- > > drivers/input/misc/Kconfig | 10 + > drivers/input/misc/Makefile | 1 > drivers/input/misc/mpu3050.c | 450 ++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 461 insertions(+), 0 deletions(-) > create mode 100644 drivers/input/misc/mpu3050.c > > > diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig > index f9cf088..ce6eed1 100644 > --- a/drivers/input/misc/Kconfig > +++ b/drivers/input/misc/Kconfig > @@ -467,4 +467,14 @@ config INPUT_XEN_KBDDEV_FRONTEND > To compile this driver as a module, choose M here: the > module will be called xen-kbdfront. > > +config INPUT_MPU3050 > + tristate "MPU3050 Triaxial gyroscope sensor" > + depends on I2C > + help > + Say Y here if you want to support InvenSense MPU3050 > + connected via an I2C bus. > + > + To compile this driver as a module, choose M here: the > + module will be called mpu3050. > + > endif > diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile > index e3f7984..c1a6917 100644 > --- a/drivers/input/misc/Makefile > +++ b/drivers/input/misc/Makefile > @@ -27,6 +27,7 @@ obj-$(CONFIG_INPUT_IXP4XX_BEEPER) += ixp4xx-beeper.o > obj-$(CONFIG_INPUT_KEYSPAN_REMOTE) += keyspan_remote.o > obj-$(CONFIG_INPUT_M68K_BEEP) += m68kspkr.o > obj-$(CONFIG_INPUT_MAX8925_ONKEY) += max8925_onkey.o > +obj-$(CONFIG_INPUT_MPU3050) += mpu3050.o > obj-$(CONFIG_INPUT_PCAP) += pcap_keys.o > obj-$(CONFIG_INPUT_PCF50633_PMU) += pcf50633-input.o > obj-$(CONFIG_INPUT_PCF8574) += pcf8574_keypad.o > diff --git a/drivers/input/misc/mpu3050.c b/drivers/input/misc/mpu3050.c > new file mode 100644 > index 0000000..f96b7bd > --- /dev/null > +++ b/drivers/input/misc/mpu3050.c > @@ -0,0 +1,450 @@ > +/* > + * mpu3050.c - MPU3050 Tri-axis gyroscope driver > + * > + * Copyright (C) 2011 Wistron Co.Ltd > + * Joseph Lai <joseph_lai@wistron.com> > + * > + * Trimmed down by Alan Cox <alan@linux.intel.com> to produce this version > + * > + * This is a 'lite' version of the driver, while we consider the right way > + * to present the other features to user space. In particular it requires the > + * device has an IRQ, and it only provides an input interface, so is not much > + * use for device orientation. A fuller version is available from the Meego > + * tree. > + * > + * This program is based on bma023.c. > + * > + * 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; version 2 of the License. > + * > + * 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. > + * > + */ > + > +#include <linux/module.h> > +#include <linux/init.h> > +#include <linux/interrupt.h> > +#include <linux/platform_device.h> > +#include <linux/mutex.h> > +#include <linux/err.h> > +#include <linux/i2c.h> > +#include <linux/input.h> > +#include <linux/delay.h> > +#include <linux/slab.h> > +#include <linux/pm_runtime.h> > + > +#define MPU3050_CHIP_ID_REG 0x00 > +#define MPU3050_CHIP_ID 0x69 > +#define MPU3050_XOUT_H 0x1D > +#define MPU3050_PWR_MGM 0x3E > +#define MPU3050_PWR_MGM_POS 6 > +#define MPU3050_PWR_MGM_MASK 0x40 > + > +#define MPU3050_AUTO_DELAY 1000 > + > +#define MPU3050_MIN_VALUE -32768 > +#define MPU3050_MAX_VALUE 32767 > + > +struct axis_data { > + s16 x; > + s16 y; > + s16 z; > +}; > + > +struct mpu3050_sensor { > + struct i2c_client *client; > + struct device *dev; > + struct input_dev *idev; > + struct mutex lock; > +}; > + > +/** > + * mpu3050_xyz_read_reg - read the axes values > + * @buffer: provide register addr and get register > + * @length: length of register > + * > + * Reads the register values in one transaction or returns a negative > + * error code on failure. > + */ > +static int mpu3050_xyz_read_reg(struct i2c_client *client, > + u8 *buffer, int length) > +{ > + /* Annoying we can't make this const because the i2c layer doesn't > + declare input buffers const */ > + char cmd = MPU3050_XOUT_H; > + struct i2c_msg msg[] = { > + { > + .addr = client->addr, > + .flags = 0, > + .len = 1, > + .buf = &cmd, > + }, > + { > + .addr = client->addr, > + .flags = I2C_M_RD, > + .len = length, > + .buf = buffer, > + }, > + }; > + return i2c_transfer(client->adapter, msg, 2); > +} > + > +/** > + * mpu3050_read_xyz - get co-ordinates from device > + * @client: i2c address of sensor > + * @coords: co-ordinates to update > + * > + * Return the converted X Y and Z co-ordinates from the sensor device > + */ > +static int mpu3050_read_xyz(struct i2c_client *client, > + struct axis_data *coords) > +{ > + u16 buffer[3]; > + int ret; > + > + ret = mpu3050_xyz_read_reg(client, (u8 *)buffer, 6); > + if (ret < 0) { > + dev_warn(&client->dev, "co-ordinate read failed\n"); > + return ret; > + } > + coords->x = be16_to_cpu(buffer[0]); > + coords->y = be16_to_cpu(buffer[1]); > + coords->z = be16_to_cpu(buffer[2]); > + dev_dbg(&client->dev, "%s: x %d, y %d, z %d\n", __func__, > + coords->x, coords->y, coords->z); > + return 0; > +} > + > +/** > + * mpu3050_set_power_mode - set the power mode > + * @client: i2c client for the sensor > + * @val: value to switch on/off of power, 1: normal power, 0: low power > + * > + * Put device to normal-power mode or low-power mode. > + */ > +static void mpu3050_set_power_mode(struct i2c_client *client, u8 val) > +{ > + u8 value; > + value = i2c_smbus_read_byte_data(client, MPU3050_PWR_MGM); > + value = (value & ~MPU3050_PWR_MGM_MASK) | > + (((val << MPU3050_PWR_MGM_POS) & MPU3050_PWR_MGM_MASK) ^ > + MPU3050_PWR_MGM_MASK); > + i2c_smbus_write_byte_data(client, MPU3050_PWR_MGM, value); > +} > + > +/** > + * mpu3050_sample - read the mpu3050 and create an event > + * @sensor: MPU3050 sensor > + * > + * Read a sample from the device and add it to the input layer events. > + * We hold the sensor lock to keep the various I²C transactions apart. > + */ > +static int mpu3050_sample(struct mpu3050_sensor *sensor) > +{ > + struct axis_data axis; > + int ret; > + > + mutex_lock(&sensor->lock); > + ret = mpu3050_read_xyz(sensor->client, &axis); > + mutex_unlock(&sensor->lock); > + > + if (ret == 0) { > + input_report_abs(sensor->idev, ABS_X, axis.x); > + input_report_abs(sensor->idev, ABS_Y, axis.y); > + input_report_abs(sensor->idev, ABS_Z, axis.z); > + input_sync(sensor->idev); > + } > + return ret; > +} > + > +/** > + * mpu3050_interrupt_thread - handle an IRQ > + * @irq: interrupt numner > + * @data: the sensor > + * > + * Called by the kernel single threaded after an interrupt occurs. Read > + * the sensor data and generate an input event for it. > + */ > +static irqreturn_t mpu3050_interrupt_thread(int irq, void *data) > +{ > + mpu3050_sample(data); > + return IRQ_HANDLED; > +} > + > +/** > + * mpu3050_input_open - called on input event open > + * @input: input dev of opened device > + * > + * The input layer calls this function when input event is opened. The > + * function will push the device to resume. Then, the device is ready > + * to provide data. > + */ > +static int mpu3050_input_open(struct input_dev *input) > +{ > + struct mpu3050_sensor *sensor = input_get_drvdata(input); > + pm_runtime_get(sensor->dev); > + /* Ensure we have valid data for one shot users */ > + mpu3050_sample(sensor); > + return 0; > +} > + > +/** > + * mpu3050_input_close - called on input event close > + * @input: input dev of closed device > + * > + * The input layer calls this function when input event is closed. The > + * function will push the device to suspend. > + */ > +static void mpu3050_input_close(struct input_dev *input) > +{ > + struct mpu3050_sensor *sensor = input_get_drvdata(input); > + pm_runtime_put(sensor->dev); > +} > + > + > +/** > + * mpu3050_unregister_input_device - remove input dev > + * @sensor: sensor to remove from input > + * > + * Free the interrupt and input device for the sensor. We must free > + * the interrupt first > + */ > +static void mpu3050_unregister_input_device(struct mpu3050_sensor *sensor) > +{ > + struct i2c_client *client = sensor->client; > + free_irq(client->irq, sensor); > + input_unregister_device(sensor->idev); > + sensor->idev = NULL; > +} > + > +/** > + * mpu3050_register_input_device - remove input dev > + * @sensor: sensor to remove from input > + * > + * Add an input device to the sensor. This will be used to report > + * events from the sensor itself. > + */ > +static int mpu3050_register_input_device(struct mpu3050_sensor *sensor) > +{ > + struct i2c_client *client = sensor->client; > + struct input_dev *idev; > + int ret; > + > + if (!client->irq) { > + dev_err(&client->dev, "no interrupt assigned\n"); > + return -ENXIO; > + } > + sensor->idev = input_allocate_device(); > + idev = sensor->idev; > + if (!idev) { > + dev_err(&client->dev, "failed to allocate input device\n"); > + ret = -ENOMEM; > + goto failed_alloc; > + } > + idev->name = "MPU3050"; > + idev->open = mpu3050_input_open; > + idev->close = mpu3050_input_close; > + idev->id.bustype = BUS_I2C; > + idev->dev.parent = &client->dev; > + idev->evbit[0] = BIT_MASK(EV_ABS); > + input_set_abs_params(idev, ABS_X, MPU3050_MIN_VALUE, > + MPU3050_MAX_VALUE, 0, 0); > + input_set_abs_params(idev, ABS_Y, MPU3050_MIN_VALUE, > + MPU3050_MAX_VALUE, 0, 0); > + input_set_abs_params(idev, ABS_Z, MPU3050_MIN_VALUE, > + MPU3050_MAX_VALUE, 0, 0); > + input_set_drvdata(idev, sensor); > + ret = input_register_device(idev); > + if (ret) { > + dev_err(&client->dev, "failed to register input device\n"); > + goto failed_reg; > + } > + ret = request_threaded_irq(client->irq, NULL, > + mpu3050_interrupt_thread, IRQF_TRIGGER_RISING, > + "mpu_int", sensor); > + if (ret) { > + dev_err(&client->dev, "can't get IRQ %d, ret %d\n", > + client->irq, ret); > + goto failed_irq; > + } > + return 0; > +failed_irq: > + input_unregister_device(idev); > + return ret; > +failed_reg: > + if (idev) > + input_free_device(idev); > +failed_alloc: > + return ret; > +} > + > +/** > + * mpu3050_probe - device detection callback > + * @client: i2c client of found device > + * @id: id match information > + * > + * The I2C layer calls us when it believes a sensor is present at this > + * address. Probe to see if this is correct and to validate the device. > + * > + * If present install the relevant sysfs interfaces and input device. > + */ > +static int __devinit mpu3050_probe(struct i2c_client *client, > + const struct i2c_device_id *id) > +{ > + struct mpu3050_sensor *sensor; > + int ret; > + sensor = kzalloc(sizeof(struct mpu3050_sensor), GFP_KERNEL); > + if (!sensor) { > + dev_err(&client->dev, "failed to allocate driver data\n"); > + return -ENOMEM; > + } > + sensor->dev = &client->dev; > + sensor->client = client; > + i2c_set_clientdata(client, sensor); > + > + mpu3050_set_power_mode(client, 1); > + msleep(10); > + ret = i2c_smbus_read_byte_data(client, MPU3050_CHIP_ID_REG); > + if (ret < 0) { > + dev_err(&client->dev, "failed to detect device\n"); > + goto failed_free; > + } > + if (ret != MPU3050_CHIP_ID) { > + dev_err(&client->dev, "unsupported chip id\n"); > + goto failed_free; > + } > + > + mutex_init(&sensor->lock); > + > + pm_runtime_set_active(&client->dev); > + > + ret = mpu3050_register_input_device(sensor); > + if (ret) > + dev_err(&client->dev, "only provide sysfs\n"); > + > + pm_runtime_enable(&client->dev); > + pm_runtime_set_autosuspend_delay(&client->dev, MPU3050_AUTO_DELAY); > + > + dev_info(&client->dev, "%s registered\n", id->name); > + return 0; > + > +failed_free: > + kfree(sensor); > + return ret; > +} > + > +/** > + * mpu3050_remove - remove a sensor > + * @client: i2c client of sensor being removed > + * > + * Our sensor is going away, clean up the resources. > + */ > +static int __devexit mpu3050_remove(struct i2c_client *client) > +{ > + struct mpu3050_sensor *sensor = i2c_get_clientdata(client); > + > + pm_runtime_disable(&client->dev); > + pm_runtime_set_suspended(&client->dev); > + > + if (sensor->idev) > + mpu3050_unregister_input_device(sensor); > + kfree(sensor); > + return 0; > +} > + > +#ifdef CONFIG_PM > +/** > + * mpu3050_suspend - called on device suspend > + * @client: i2c client of sensor > + * @mesg: actual suspend type > + * > + * Put the device into sleep mode before we suspend the machine. > + */ > +static int mpu3050_suspend(struct i2c_client *client, pm_message_t mesg) > +{ > + mpu3050_set_power_mode(client, 0); > + return 0; > +} > + > +/** > + * mpu3050_resume - called on device resume > + * @client: i2c client of sensor > + * > + * Put the device into powered mode on resume. > + */ > +static int mpu3050_resume(struct i2c_client *client) > +{ > + mpu3050_set_power_mode(client, 1); > + msleep(100); /* wait for gyro chip resume */ > + return 0; > +} > +#else > +#define mpu3050_suspend NULL > +#define mpu3050_resume NULL > +#endif > + > +#ifdef CONFIG_PM_RUNTIME > +static int mpu3050_runtime_suspend(struct device *dev) > +{ > + struct mpu3050_sensor *sensor = dev_get_drvdata(dev); > + mpu3050_set_power_mode(sensor->client, 0); > + return 0; > +} > + > +static int mpu3050_runtime_resume(struct device *dev) > +{ > + struct mpu3050_sensor *sensor = dev_get_drvdata(dev); > + mpu3050_set_power_mode(sensor->client, 1); > + msleep(100); /* wait for gyro chip resume */ > + return 0; > +} > + > +static const struct dev_pm_ops mpu3050_pm = { > + .runtime_suspend = mpu3050_runtime_suspend, > + .runtime_resume = mpu3050_runtime_resume, > +}; > +#endif > + > +static const struct i2c_device_id mpu3050_ids[] = { > + { "mpu3050", 0 }, > + { } > +}; > +MODULE_DEVICE_TABLE(i2c, mpu3050_ids); > + > +static struct i2c_driver mpu3050_i2c_driver = { > + .driver = { > + .name = "mpu3050", > +#ifdef CONFIG_PM_RUNTIME > + .pm = &mpu3050_pm, > +#endif > + }, > + .probe = mpu3050_probe, > + .remove = __devexit_p(mpu3050_remove), > + .suspend = mpu3050_suspend, > + .resume = mpu3050_resume, > + .id_table = mpu3050_ids, > +}; > + > +static int __init mpu3050_init(void) > +{ > + return i2c_add_driver(&mpu3050_i2c_driver); > +} > +module_init(mpu3050_init); > + > +static void __exit mpu3050_exit(void) > +{ > + i2c_del_driver(&mpu3050_i2c_driver); > +} > +module_exit(mpu3050_exit); > + > +MODULE_AUTHOR("Wistron Corp."); > +MODULE_DESCRIPTION("MPU3050 Tri-axis gyroscope driver"); > +MODULE_LICENSE("GPL"); > > -- > To unsubscribe from this list: send the line "unsubscribe linux-input" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig index f9cf088..ce6eed1 100644 --- a/drivers/input/misc/Kconfig +++ b/drivers/input/misc/Kconfig @@ -467,4 +467,14 @@ config INPUT_XEN_KBDDEV_FRONTEND To compile this driver as a module, choose M here: the module will be called xen-kbdfront. +config INPUT_MPU3050 + tristate "MPU3050 Triaxial gyroscope sensor" + depends on I2C + help + Say Y here if you want to support InvenSense MPU3050 + connected via an I2C bus. + + To compile this driver as a module, choose M here: the + module will be called mpu3050. + endif diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile index e3f7984..c1a6917 100644 --- a/drivers/input/misc/Makefile +++ b/drivers/input/misc/Makefile @@ -27,6 +27,7 @@ obj-$(CONFIG_INPUT_IXP4XX_BEEPER) += ixp4xx-beeper.o obj-$(CONFIG_INPUT_KEYSPAN_REMOTE) += keyspan_remote.o obj-$(CONFIG_INPUT_M68K_BEEP) += m68kspkr.o obj-$(CONFIG_INPUT_MAX8925_ONKEY) += max8925_onkey.o +obj-$(CONFIG_INPUT_MPU3050) += mpu3050.o obj-$(CONFIG_INPUT_PCAP) += pcap_keys.o obj-$(CONFIG_INPUT_PCF50633_PMU) += pcf50633-input.o obj-$(CONFIG_INPUT_PCF8574) += pcf8574_keypad.o diff --git a/drivers/input/misc/mpu3050.c b/drivers/input/misc/mpu3050.c new file mode 100644 index 0000000..f96b7bd --- /dev/null +++ b/drivers/input/misc/mpu3050.c @@ -0,0 +1,450 @@ +/* + * mpu3050.c - MPU3050 Tri-axis gyroscope driver + * + * Copyright (C) 2011 Wistron Co.Ltd + * Joseph Lai <joseph_lai@wistron.com> + * + * Trimmed down by Alan Cox <alan@linux.intel.com> to produce this version + * + * This is a 'lite' version of the driver, while we consider the right way + * to present the other features to user space. In particular it requires the + * device has an IRQ, and it only provides an input interface, so is not much + * use for device orientation. A fuller version is available from the Meego + * tree. + * + * This program is based on bma023.c. + * + * 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; version 2 of the License. + * + * 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. + * + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/mutex.h> +#include <linux/err.h> +#include <linux/i2c.h> +#include <linux/input.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/pm_runtime.h> + +#define MPU3050_CHIP_ID_REG 0x00 +#define MPU3050_CHIP_ID 0x69 +#define MPU3050_XOUT_H 0x1D +#define MPU3050_PWR_MGM 0x3E +#define MPU3050_PWR_MGM_POS 6 +#define MPU3050_PWR_MGM_MASK 0x40 + +#define MPU3050_AUTO_DELAY 1000 + +#define MPU3050_MIN_VALUE -32768 +#define MPU3050_MAX_VALUE 32767 + +struct axis_data { + s16 x; + s16 y; + s16 z; +}; + +struct mpu3050_sensor { + struct i2c_client *client; + struct device *dev; + struct input_dev *idev; + struct mutex lock; +}; + +/** + * mpu3050_xyz_read_reg - read the axes values + * @buffer: provide register addr and get register + * @length: length of register + * + * Reads the register values in one transaction or returns a negative + * error code on failure. + */ +static int mpu3050_xyz_read_reg(struct i2c_client *client, + u8 *buffer, int length) +{ + /* Annoying we can't make this const because the i2c layer doesn't + declare input buffers const */ + char cmd = MPU3050_XOUT_H; + struct i2c_msg msg[] = { + { + .addr = client->addr, + .flags = 0, + .len = 1, + .buf = &cmd, + }, + { + .addr = client->addr, + .flags = I2C_M_RD, + .len = length, + .buf = buffer, + }, + }; + return i2c_transfer(client->adapter, msg, 2); +} + +/** + * mpu3050_read_xyz - get co-ordinates from device + * @client: i2c address of sensor + * @coords: co-ordinates to update + * + * Return the converted X Y and Z co-ordinates from the sensor device + */ +static int mpu3050_read_xyz(struct i2c_client *client, + struct axis_data *coords) +{ + u16 buffer[3]; + int ret; + + ret = mpu3050_xyz_read_reg(client, (u8 *)buffer, 6); + if (ret < 0) { + dev_warn(&client->dev, "co-ordinate read failed\n"); + return ret; + } + coords->x = be16_to_cpu(buffer[0]); + coords->y = be16_to_cpu(buffer[1]); + coords->z = be16_to_cpu(buffer[2]); + dev_dbg(&client->dev, "%s: x %d, y %d, z %d\n", __func__, + coords->x, coords->y, coords->z); + return 0; +} + +/** + * mpu3050_set_power_mode - set the power mode + * @client: i2c client for the sensor + * @val: value to switch on/off of power, 1: normal power, 0: low power + * + * Put device to normal-power mode or low-power mode. + */ +static void mpu3050_set_power_mode(struct i2c_client *client, u8 val) +{ + u8 value; + value = i2c_smbus_read_byte_data(client, MPU3050_PWR_MGM); + value = (value & ~MPU3050_PWR_MGM_MASK) | + (((val << MPU3050_PWR_MGM_POS) & MPU3050_PWR_MGM_MASK) ^ + MPU3050_PWR_MGM_MASK); + i2c_smbus_write_byte_data(client, MPU3050_PWR_MGM, value); +} + +/** + * mpu3050_sample - read the mpu3050 and create an event + * @sensor: MPU3050 sensor + * + * Read a sample from the device and add it to the input layer events. + * We hold the sensor lock to keep the various I²C transactions apart. + */ +static int mpu3050_sample(struct mpu3050_sensor *sensor) +{ + struct axis_data axis; + int ret; + + mutex_lock(&sensor->lock); + ret = mpu3050_read_xyz(sensor->client, &axis); + mutex_unlock(&sensor->lock); + + if (ret == 0) { + input_report_abs(sensor->idev, ABS_X, axis.x); + input_report_abs(sensor->idev, ABS_Y, axis.y); + input_report_abs(sensor->idev, ABS_Z, axis.z); + input_sync(sensor->idev); + } + return ret; +} + +/** + * mpu3050_interrupt_thread - handle an IRQ + * @irq: interrupt numner + * @data: the sensor + * + * Called by the kernel single threaded after an interrupt occurs. Read + * the sensor data and generate an input event for it. + */ +static irqreturn_t mpu3050_interrupt_thread(int irq, void *data) +{ + mpu3050_sample(data); + return IRQ_HANDLED; +} + +/** + * mpu3050_input_open - called on input event open + * @input: input dev of opened device + * + * The input layer calls this function when input event is opened. The + * function will push the device to resume. Then, the device is ready + * to provide data. + */ +static int mpu3050_input_open(struct input_dev *input) +{ + struct mpu3050_sensor *sensor = input_get_drvdata(input); + pm_runtime_get(sensor->dev); + /* Ensure we have valid data for one shot users */ + mpu3050_sample(sensor); + return 0; +} + +/** + * mpu3050_input_close - called on input event close + * @input: input dev of closed device + * + * The input layer calls this function when input event is closed. The + * function will push the device to suspend. + */ +static void mpu3050_input_close(struct input_dev *input) +{ + struct mpu3050_sensor *sensor = input_get_drvdata(input); + pm_runtime_put(sensor->dev); +} + + +/** + * mpu3050_unregister_input_device - remove input dev + * @sensor: sensor to remove from input + * + * Free the interrupt and input device for the sensor. We must free + * the interrupt first + */ +static void mpu3050_unregister_input_device(struct mpu3050_sensor *sensor) +{ + struct i2c_client *client = sensor->client; + free_irq(client->irq, sensor); + input_unregister_device(sensor->idev); + sensor->idev = NULL; +} + +/** + * mpu3050_register_input_device - remove input dev + * @sensor: sensor to remove from input + * + * Add an input device to the sensor. This will be used to report + * events from the sensor itself. + */ +static int mpu3050_register_input_device(struct mpu3050_sensor *sensor) +{ + struct i2c_client *client = sensor->client; + struct input_dev *idev; + int ret; + + if (!client->irq) { + dev_err(&client->dev, "no interrupt assigned\n"); + return -ENXIO; + } + sensor->idev = input_allocate_device(); + idev = sensor->idev; + if (!idev) { + dev_err(&client->dev, "failed to allocate input device\n"); + ret = -ENOMEM; + goto failed_alloc; + } + idev->name = "MPU3050"; + idev->open = mpu3050_input_open; + idev->close = mpu3050_input_close; + idev->id.bustype = BUS_I2C; + idev->dev.parent = &client->dev; + idev->evbit[0] = BIT_MASK(EV_ABS); + input_set_abs_params(idev, ABS_X, MPU3050_MIN_VALUE, + MPU3050_MAX_VALUE, 0, 0); + input_set_abs_params(idev, ABS_Y, MPU3050_MIN_VALUE, + MPU3050_MAX_VALUE, 0, 0); + input_set_abs_params(idev, ABS_Z, MPU3050_MIN_VALUE, + MPU3050_MAX_VALUE, 0, 0); + input_set_drvdata(idev, sensor); + ret = input_register_device(idev); + if (ret) { + dev_err(&client->dev, "failed to register input device\n"); + goto failed_reg; + } + ret = request_threaded_irq(client->irq, NULL, + mpu3050_interrupt_thread, IRQF_TRIGGER_RISING, + "mpu_int", sensor); + if (ret) { + dev_err(&client->dev, "can't get IRQ %d, ret %d\n", + client->irq, ret); + goto failed_irq; + } + return 0; +failed_irq: + input_unregister_device(idev); + return ret; +failed_reg: + if (idev) + input_free_device(idev); +failed_alloc: + return ret; +} + +/** + * mpu3050_probe - device detection callback + * @client: i2c client of found device + * @id: id match information + * + * The I2C layer calls us when it believes a sensor is present at this + * address. Probe to see if this is correct and to validate the device. + * + * If present install the relevant sysfs interfaces and input device. + */ +static int __devinit mpu3050_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct mpu3050_sensor *sensor; + int ret; + sensor = kzalloc(sizeof(struct mpu3050_sensor), GFP_KERNEL); + if (!sensor) { + dev_err(&client->dev, "failed to allocate driver data\n"); + return -ENOMEM; + } + sensor->dev = &client->dev; + sensor->client = client; + i2c_set_clientdata(client, sensor); + + mpu3050_set_power_mode(client, 1); + msleep(10); + ret = i2c_smbus_read_byte_data(client, MPU3050_CHIP_ID_REG); + if (ret < 0) { + dev_err(&client->dev, "failed to detect device\n"); + goto failed_free; + } + if (ret != MPU3050_CHIP_ID) { + dev_err(&client->dev, "unsupported chip id\n"); + goto failed_free; + } + + mutex_init(&sensor->lock); + + pm_runtime_set_active(&client->dev); + + ret = mpu3050_register_input_device(sensor); + if (ret) + dev_err(&client->dev, "only provide sysfs\n"); + + pm_runtime_enable(&client->dev); + pm_runtime_set_autosuspend_delay(&client->dev, MPU3050_AUTO_DELAY); + + dev_info(&client->dev, "%s registered\n", id->name); + return 0; + +failed_free: + kfree(sensor); + return ret; +} + +/** + * mpu3050_remove - remove a sensor + * @client: i2c client of sensor being removed + * + * Our sensor is going away, clean up the resources. + */ +static int __devexit mpu3050_remove(struct i2c_client *client) +{ + struct mpu3050_sensor *sensor = i2c_get_clientdata(client); + + pm_runtime_disable(&client->dev); + pm_runtime_set_suspended(&client->dev); + + if (sensor->idev) + mpu3050_unregister_input_device(sensor); + kfree(sensor); + return 0; +} + +#ifdef CONFIG_PM +/** + * mpu3050_suspend - called on device suspend + * @client: i2c client of sensor + * @mesg: actual suspend type + * + * Put the device into sleep mode before we suspend the machine. + */ +static int mpu3050_suspend(struct i2c_client *client, pm_message_t mesg) +{ + mpu3050_set_power_mode(client, 0); + return 0; +} + +/** + * mpu3050_resume - called on device resume + * @client: i2c client of sensor + * + * Put the device into powered mode on resume. + */ +static int mpu3050_resume(struct i2c_client *client) +{ + mpu3050_set_power_mode(client, 1); + msleep(100); /* wait for gyro chip resume */ + return 0; +} +#else +#define mpu3050_suspend NULL +#define mpu3050_resume NULL +#endif + +#ifdef CONFIG_PM_RUNTIME +static int mpu3050_runtime_suspend(struct device *dev) +{ + struct mpu3050_sensor *sensor = dev_get_drvdata(dev); + mpu3050_set_power_mode(sensor->client, 0); + return 0; +} + +static int mpu3050_runtime_resume(struct device *dev) +{ + struct mpu3050_sensor *sensor = dev_get_drvdata(dev); + mpu3050_set_power_mode(sensor->client, 1); + msleep(100); /* wait for gyro chip resume */ + return 0; +} + +static const struct dev_pm_ops mpu3050_pm = { + .runtime_suspend = mpu3050_runtime_suspend, + .runtime_resume = mpu3050_runtime_resume, +}; +#endif + +static const struct i2c_device_id mpu3050_ids[] = { + { "mpu3050", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, mpu3050_ids); + +static struct i2c_driver mpu3050_i2c_driver = { + .driver = { + .name = "mpu3050", +#ifdef CONFIG_PM_RUNTIME + .pm = &mpu3050_pm, +#endif + }, + .probe = mpu3050_probe, + .remove = __devexit_p(mpu3050_remove), + .suspend = mpu3050_suspend, + .resume = mpu3050_resume, + .id_table = mpu3050_ids, +}; + +static int __init mpu3050_init(void) +{ + return i2c_add_driver(&mpu3050_i2c_driver); +} +module_init(mpu3050_init); + +static void __exit mpu3050_exit(void) +{ + i2c_del_driver(&mpu3050_i2c_driver); +} +module_exit(mpu3050_exit); + +MODULE_AUTHOR("Wistron Corp."); +MODULE_DESCRIPTION("MPU3050 Tri-axis gyroscope driver"); +MODULE_LICENSE("GPL");