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iio: add driver for Freescale MMA9551L
Add support for Freescale MMA9551L Intelligent Motion-Sensing Platform. The driver supports raw reads for acceleration and inclination, as well as configuring inclination rate-of-change events. The events can be used similarly to an Android sensor Tilt event. The specifications can be downloaded from: http://www.freescale.com/files/sensors/doc/ref_manual/MMA955xLSWRM.pdf Signed-off-by: Irina Tirdea <irina.tirdea@intel.com> Signed-off-by: Vlad Dogaru <vlad.dogaru@intel.com> Reviewed-by: Hartmut Knaack <knaack.h@gmx.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Vlad Dogaru
Jonathan Cameron
parent
7f1c2cbbda
commit
c78b917163
@ -105,4 +105,14 @@ config KXCJK1013
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To compile this driver as a module, choose M here: the module will
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be called kxcjk-1013.
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config MMA9551
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tristate "Freescale MMA9551L Intelligent Motion-Sensing Platform Driver"
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depends on I2C
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help
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Say yes here to build support for the Freescale MMA9551L
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Intelligent Motion-Sensing Platform Driver.
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To compile this driver as a module, choose M here: the module
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will be called mma9551.
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endmenu
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@ -9,6 +9,7 @@ obj-$(CONFIG_HID_SENSOR_ACCEL_3D) += hid-sensor-accel-3d.o
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obj-$(CONFIG_KXCJK1013) += kxcjk-1013.o
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obj-$(CONFIG_KXSD9) += kxsd9.o
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obj-$(CONFIG_MMA8452) += mma8452.o
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obj-$(CONFIG_MMA9551) += mma9551.o
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obj-$(CONFIG_IIO_ST_ACCEL_3AXIS) += st_accel.o
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st_accel-y := st_accel_core.o
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954
drivers/iio/accel/mma9551.c
Normal file
954
drivers/iio/accel/mma9551.c
Normal file
@ -0,0 +1,954 @@
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/*
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* Freescale MMA9551L Intelligent Motion-Sensing Platform driver
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* Copyright (c) 2014, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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#include <linux/delay.h>
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#include <linux/gpio/consumer.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/events.h>
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#define MMA9551_DRV_NAME "mma9551"
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#define MMA9551_IRQ_NAME "mma9551_event"
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#define MMA9551_GPIO_NAME "mma9551_int"
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#define MMA9551_GPIO_COUNT 4
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/* Applications IDs */
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#define MMA9551_APPID_VERSION 0x00
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#define MMA9551_APPID_GPIO 0x03
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#define MMA9551_APPID_AFE 0x06
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#define MMA9551_APPID_TILT 0x0B
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#define MMA9551_APPID_SLEEP_WAKE 0x12
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#define MMA9551_APPID_RESET 0x17
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#define MMA9551_APPID_NONE 0xff
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/* Command masks for mailbox write command */
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#define MMA9551_CMD_READ_VERSION_INFO 0x00
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#define MMA9551_CMD_READ_CONFIG 0x10
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#define MMA9551_CMD_WRITE_CONFIG 0x20
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#define MMA9551_CMD_READ_STATUS 0x30
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enum mma9551_gpio_pin {
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mma9551_gpio6 = 0,
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mma9551_gpio7,
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mma9551_gpio8,
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mma9551_gpio9,
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mma9551_gpio_max = mma9551_gpio9,
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};
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/* Mailbox read command */
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#define MMA9551_RESPONSE_COCO BIT(7)
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/* Error-Status codes returned in mailbox read command */
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#define MMA9551_MCI_ERROR_NONE 0x00
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#define MMA9551_MCI_ERROR_PARAM 0x04
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#define MMA9551_MCI_INVALID_COUNT 0x19
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#define MMA9551_MCI_ERROR_COMMAND 0x1C
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#define MMA9551_MCI_ERROR_INVALID_LENGTH 0x21
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#define MMA9551_MCI_ERROR_FIFO_BUSY 0x22
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#define MMA9551_MCI_ERROR_FIFO_ALLOCATED 0x23
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#define MMA9551_MCI_ERROR_FIFO_OVERSIZE 0x24
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/* GPIO Application */
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#define MMA9551_GPIO_POL_MSB 0x08
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#define MMA9551_GPIO_POL_LSB 0x09
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/* Sleep/Wake application */
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#define MMA9551_SLEEP_CFG 0x06
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#define MMA9551_SLEEP_CFG_SNCEN BIT(0)
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#define MMA9551_SLEEP_CFG_SCHEN BIT(2)
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/* AFE application */
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#define MMA9551_AFE_X_ACCEL_REG 0x00
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#define MMA9551_AFE_Y_ACCEL_REG 0x02
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#define MMA9551_AFE_Z_ACCEL_REG 0x04
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/* Tilt application (inclination in IIO terms). */
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#define MMA9551_TILT_XZ_ANG_REG 0x00
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#define MMA9551_TILT_YZ_ANG_REG 0x01
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#define MMA9551_TILT_XY_ANG_REG 0x02
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#define MMA9551_TILT_ANGFLG BIT(7)
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#define MMA9551_TILT_QUAD_REG 0x03
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#define MMA9551_TILT_XY_QUAD_SHIFT 0
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#define MMA9551_TILT_YZ_QUAD_SHIFT 2
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#define MMA9551_TILT_XZ_QUAD_SHIFT 4
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#define MMA9551_TILT_CFG_REG 0x01
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#define MMA9551_TILT_ANG_THRESH_MASK GENMASK(3, 0)
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/* Tilt events are mapped to the first three GPIO pins. */
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enum mma9551_tilt_axis {
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mma9551_x = 0,
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mma9551_y,
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mma9551_z,
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};
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/*
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* A response is composed of:
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* - control registers: MB0-3
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* - data registers: MB4-31
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*
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* A request is composed of:
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* - mbox to write to (always 0)
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* - control registers: MB1-4
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* - data registers: MB5-31
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*/
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#define MMA9551_MAILBOX_CTRL_REGS 4
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#define MMA9551_MAX_MAILBOX_DATA_REGS 28
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#define MMA9551_MAILBOX_REGS 32
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#define MMA9551_I2C_READ_RETRIES 5
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#define MMA9551_I2C_READ_DELAY 50 /* us */
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struct mma9551_mbox_request {
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u8 start_mbox; /* Always 0. */
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u8 app_id;
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/*
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* See Section 5.3.1 of the MMA955xL Software Reference Manual.
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*
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* Bit 7: reserved, always 0
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* Bits 6-4: command
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* Bits 3-0: upper bits of register offset
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*/
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u8 cmd_off;
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u8 lower_off;
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u8 nbytes;
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u8 buf[MMA9551_MAX_MAILBOX_DATA_REGS - 1];
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} __packed;
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struct mma9551_mbox_response {
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u8 app_id;
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/*
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* See Section 5.3.3 of the MMA955xL Software Reference Manual.
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*
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* Bit 7: COCO
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* Bits 6-0: Error code.
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*/
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u8 coco_err;
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u8 nbytes;
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u8 req_bytes;
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u8 buf[MMA9551_MAX_MAILBOX_DATA_REGS];
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} __packed;
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struct mma9551_version_info {
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__be32 device_id;
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u8 rom_version[2];
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u8 fw_version[2];
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u8 hw_version[2];
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u8 fw_build[2];
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};
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struct mma9551_data {
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struct i2c_client *client;
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struct mutex mutex;
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int event_enabled[3];
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int irqs[MMA9551_GPIO_COUNT];
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};
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static int mma9551_transfer(struct i2c_client *client,
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u8 app_id, u8 command, u16 offset,
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u8 *inbytes, int num_inbytes,
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u8 *outbytes, int num_outbytes)
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{
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struct mma9551_mbox_request req;
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struct mma9551_mbox_response rsp;
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struct i2c_msg in, out;
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u8 req_len, err_code;
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int ret, retries;
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if (offset >= 1 << 12) {
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dev_err(&client->dev, "register offset too large\n");
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return -EINVAL;
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}
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req_len = 1 + MMA9551_MAILBOX_CTRL_REGS + num_inbytes;
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req.start_mbox = 0;
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req.app_id = app_id;
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req.cmd_off = command | (offset >> 8);
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req.lower_off = offset;
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if (command == MMA9551_CMD_WRITE_CONFIG)
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req.nbytes = num_inbytes;
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else
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req.nbytes = num_outbytes;
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if (num_inbytes)
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memcpy(req.buf, inbytes, num_inbytes);
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out.addr = client->addr;
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out.flags = 0;
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out.len = req_len;
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out.buf = (u8 *)&req;
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ret = i2c_transfer(client->adapter, &out, 1);
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if (ret < 0) {
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dev_err(&client->dev, "i2c write failed\n");
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return ret;
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}
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retries = MMA9551_I2C_READ_RETRIES;
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do {
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udelay(MMA9551_I2C_READ_DELAY);
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in.addr = client->addr;
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in.flags = I2C_M_RD;
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in.len = sizeof(rsp);
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in.buf = (u8 *)&rsp;
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ret = i2c_transfer(client->adapter, &in, 1);
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if (ret < 0) {
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dev_err(&client->dev, "i2c read failed\n");
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return ret;
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}
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if (rsp.coco_err & MMA9551_RESPONSE_COCO)
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break;
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} while (--retries > 0);
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if (retries == 0) {
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dev_err(&client->dev,
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"timed out while waiting for command response\n");
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return -ETIMEDOUT;
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}
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if (rsp.app_id != app_id) {
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dev_err(&client->dev,
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"app_id mismatch in response got %02x expected %02x\n",
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rsp.app_id, app_id);
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return -EINVAL;
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}
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err_code = rsp.coco_err & ~MMA9551_RESPONSE_COCO;
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if (err_code != MMA9551_MCI_ERROR_NONE) {
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dev_err(&client->dev, "read returned error %x\n", err_code);
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return -EINVAL;
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}
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if (rsp.nbytes != rsp.req_bytes) {
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dev_err(&client->dev,
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"output length mismatch got %d expected %d\n",
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rsp.nbytes, rsp.req_bytes);
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return -EINVAL;
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}
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if (num_outbytes)
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memcpy(outbytes, rsp.buf, num_outbytes);
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return 0;
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}
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static int mma9551_read_config_byte(struct i2c_client *client, u8 app_id,
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u16 reg, u8 *val)
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{
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return mma9551_transfer(client, app_id, MMA9551_CMD_READ_CONFIG,
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reg, NULL, 0, val, 1);
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}
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static int mma9551_write_config_byte(struct i2c_client *client, u8 app_id,
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u16 reg, u8 val)
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{
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return mma9551_transfer(client, app_id, MMA9551_CMD_WRITE_CONFIG, reg,
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&val, 1, NULL, 0);
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}
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static int mma9551_read_status_byte(struct i2c_client *client, u8 app_id,
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u16 reg, u8 *val)
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{
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return mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS,
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reg, NULL, 0, val, 1);
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}
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static int mma9551_read_status_word(struct i2c_client *client, u8 app_id,
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u16 reg, u16 *val)
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{
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int ret;
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__be16 v;
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ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS,
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reg, NULL, 0, (u8 *)&v, 2);
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*val = be16_to_cpu(v);
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return ret;
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}
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static int mma9551_update_config_bits(struct i2c_client *client, u8 app_id,
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u16 reg, u8 mask, u8 val)
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{
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int ret;
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u8 tmp, orig;
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ret = mma9551_read_config_byte(client, app_id, reg, &orig);
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if (ret < 0)
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return ret;
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tmp = orig & ~mask;
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tmp |= val & mask;
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if (tmp == orig)
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return 0;
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return mma9551_write_config_byte(client, app_id, reg, tmp);
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}
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/*
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* The polarity parameter is described in section 6.2.2, page 66, of the
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* Software Reference Manual. Basically, polarity=0 means the interrupt
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* line has the same value as the selected bit, while polarity=1 means
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* the line is inverted.
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*/
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static int mma9551_gpio_config(struct i2c_client *client,
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enum mma9551_gpio_pin pin,
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u8 app_id, u8 bitnum, int polarity)
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{
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u8 reg, pol_mask, pol_val;
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int ret;
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if (pin > mma9551_gpio_max) {
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dev_err(&client->dev, "bad GPIO pin\n");
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return -EINVAL;
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}
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/*
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* Pin 6 is configured by regs 0x00 and 0x01, pin 7 by 0x02 and
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* 0x03, and so on.
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*/
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reg = pin * 2;
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ret = mma9551_write_config_byte(client, MMA9551_APPID_GPIO,
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reg, app_id);
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if (ret < 0) {
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dev_err(&client->dev, "error setting GPIO app_id\n");
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return ret;
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}
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ret = mma9551_write_config_byte(client, MMA9551_APPID_GPIO,
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reg + 1, bitnum);
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if (ret < 0) {
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dev_err(&client->dev, "error setting GPIO bit number\n");
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return ret;
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}
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switch (pin) {
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case mma9551_gpio6:
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reg = MMA9551_GPIO_POL_LSB;
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pol_mask = 1 << 6;
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break;
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case mma9551_gpio7:
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reg = MMA9551_GPIO_POL_LSB;
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pol_mask = 1 << 7;
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break;
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case mma9551_gpio8:
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reg = MMA9551_GPIO_POL_MSB;
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pol_mask = 1 << 0;
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break;
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case mma9551_gpio9:
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reg = MMA9551_GPIO_POL_MSB;
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pol_mask = 1 << 1;
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break;
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}
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pol_val = polarity ? pol_mask : 0;
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ret = mma9551_update_config_bits(client, MMA9551_APPID_GPIO, reg,
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pol_mask, pol_val);
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if (ret < 0)
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dev_err(&client->dev, "error setting GPIO polarity\n");
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return ret;
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}
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static int mma9551_read_version(struct i2c_client *client)
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{
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struct mma9551_version_info info;
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int ret;
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ret = mma9551_transfer(client, MMA9551_APPID_VERSION, 0x00, 0x00,
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NULL, 0, (u8 *)&info, sizeof(info));
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if (ret < 0)
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return ret;
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dev_info(&client->dev, "Device ID 0x%x, firmware version %02x.%02x\n",
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be32_to_cpu(info.device_id), info.fw_version[0],
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info.fw_version[1]);
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return 0;
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}
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/*
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* Use 'false' as the second parameter to cause the device to enter
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* sleep.
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*/
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static int mma9551_set_device_state(struct i2c_client *client,
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bool enable)
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{
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return mma9551_update_config_bits(client, MMA9551_APPID_SLEEP_WAKE,
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MMA9551_SLEEP_CFG,
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MMA9551_SLEEP_CFG_SNCEN,
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enable ? 0 : MMA9551_SLEEP_CFG_SNCEN);
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}
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static int mma9551_read_incli_chan(struct i2c_client *client,
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const struct iio_chan_spec *chan,
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int *val)
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{
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u8 quad_shift, angle, quadrant;
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u16 reg_addr;
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int ret;
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switch (chan->channel2) {
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case IIO_MOD_X:
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reg_addr = MMA9551_TILT_YZ_ANG_REG;
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quad_shift = MMA9551_TILT_YZ_QUAD_SHIFT;
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break;
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case IIO_MOD_Y:
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reg_addr = MMA9551_TILT_XZ_ANG_REG;
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quad_shift = MMA9551_TILT_XZ_QUAD_SHIFT;
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break;
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case IIO_MOD_Z:
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reg_addr = MMA9551_TILT_XY_ANG_REG;
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||||
quad_shift = MMA9551_TILT_XY_QUAD_SHIFT;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
|
||||
reg_addr, &angle);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
|
||||
MMA9551_TILT_QUAD_REG, &quadrant);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
angle &= ~MMA9551_TILT_ANGFLG;
|
||||
quadrant = (quadrant >> quad_shift) & 0x03;
|
||||
|
||||
if (quadrant == 1 || quadrant == 3)
|
||||
*val = 90 * (quadrant + 1) - angle;
|
||||
else
|
||||
*val = angle + 90 * quadrant;
|
||||
|
||||
return IIO_VAL_INT;
|
||||
}
|
||||
|
||||
static int mma9551_read_accel_chan(struct i2c_client *client,
|
||||
const struct iio_chan_spec *chan,
|
||||
int *val, int *val2)
|
||||
{
|
||||
u16 reg_addr;
|
||||
s16 raw_accel;
|
||||
int ret;
|
||||
|
||||
switch (chan->channel2) {
|
||||
case IIO_MOD_X:
|
||||
reg_addr = MMA9551_AFE_X_ACCEL_REG;
|
||||
break;
|
||||
case IIO_MOD_Y:
|
||||
reg_addr = MMA9551_AFE_Y_ACCEL_REG;
|
||||
break;
|
||||
case IIO_MOD_Z:
|
||||
reg_addr = MMA9551_AFE_Z_ACCEL_REG;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
ret = mma9551_read_status_word(client, MMA9551_APPID_AFE,
|
||||
reg_addr, &raw_accel);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
*val = raw_accel;
|
||||
|
||||
return IIO_VAL_INT;
|
||||
}
|
||||
|
||||
static int mma9551_read_raw(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan,
|
||||
int *val, int *val2, long mask)
|
||||
{
|
||||
struct mma9551_data *data = iio_priv(indio_dev);
|
||||
int ret;
|
||||
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_PROCESSED:
|
||||
switch (chan->type) {
|
||||
case IIO_INCLI:
|
||||
mutex_lock(&data->mutex);
|
||||
ret = mma9551_read_incli_chan(data->client, chan, val);
|
||||
mutex_unlock(&data->mutex);
|
||||
return ret;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
case IIO_CHAN_INFO_RAW:
|
||||
switch (chan->type) {
|
||||
case IIO_ACCEL:
|
||||
mutex_lock(&data->mutex);
|
||||
ret = mma9551_read_accel_chan(data->client,
|
||||
chan, val, val2);
|
||||
mutex_unlock(&data->mutex);
|
||||
return ret;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
case IIO_CHAN_INFO_SCALE:
|
||||
switch (chan->type) {
|
||||
case IIO_ACCEL:
|
||||
*val = 0;
|
||||
*val2 = 2440;
|
||||
return IIO_VAL_INT_PLUS_MICRO;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
static int mma9551_read_event_config(struct iio_dev *indio_dev,
|
||||
const struct iio_chan_spec *chan,
|
||||
enum iio_event_type type,
|
||||
enum iio_event_direction dir)
|
||||
{
|
||||
struct mma9551_data *data = iio_priv(indio_dev);
|
||||
|
||||
switch (chan->type) {
|
||||
case IIO_INCLI:
|
||||
/* IIO counts axes from 1, because IIO_NO_MOD is 0. */
|
||||
return data->event_enabled[chan->channel2 - 1];
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
static int mma9551_config_incli_event(struct iio_dev *indio_dev,
|
||||
enum iio_modifier axis,
|
||||
int state)
|
||||
{
|
||||
struct mma9551_data *data = iio_priv(indio_dev);
|
||||
enum mma9551_tilt_axis mma_axis;
|
||||
int ret;
|
||||
|
||||
/* IIO counts axes from 1, because IIO_NO_MOD is 0. */
|
||||
mma_axis = axis - 1;
|
||||
|
||||
if (data->event_enabled[mma_axis] == state)
|
||||
return 0;
|
||||
|
||||
if (state == 0) {
|
||||
ret = mma9551_gpio_config(data->client, mma_axis,
|
||||
MMA9551_APPID_NONE, 0, 0);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
} else {
|
||||
int bitnum;
|
||||
|
||||
/* Bit 7 of each angle register holds the angle flag. */
|
||||
switch (axis) {
|
||||
case IIO_MOD_X:
|
||||
bitnum = 7 + 8 * MMA9551_TILT_YZ_ANG_REG;
|
||||
break;
|
||||
case IIO_MOD_Y:
|
||||
bitnum = 7 + 8 * MMA9551_TILT_XZ_ANG_REG;
|
||||
break;
|
||||
case IIO_MOD_Z:
|
||||
bitnum = 7 + 8 * MMA9551_TILT_XY_ANG_REG;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
ret = mma9551_gpio_config(data->client, mma_axis,
|
||||
MMA9551_APPID_TILT, bitnum, 0);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
}
|
||||
|
||||
data->event_enabled[mma_axis] = state;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int mma9551_write_event_config(struct iio_dev *indio_dev,
|
||||
const struct iio_chan_spec *chan,
|
||||
enum iio_event_type type,
|
||||
enum iio_event_direction dir,
|
||||
int state)
|
||||
{
|
||||
struct mma9551_data *data = iio_priv(indio_dev);
|
||||
int ret;
|
||||
|
||||
switch (chan->type) {
|
||||
case IIO_INCLI:
|
||||
mutex_lock(&data->mutex);
|
||||
ret = mma9551_config_incli_event(indio_dev,
|
||||
chan->channel2, state);
|
||||
mutex_unlock(&data->mutex);
|
||||
return ret;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
static int mma9551_write_event_value(struct iio_dev *indio_dev,
|
||||
const struct iio_chan_spec *chan,
|
||||
enum iio_event_type type,
|
||||
enum iio_event_direction dir,
|
||||
enum iio_event_info info,
|
||||
int val, int val2)
|
||||
{
|
||||
struct mma9551_data *data = iio_priv(indio_dev);
|
||||
int ret;
|
||||
|
||||
switch (chan->type) {
|
||||
case IIO_INCLI:
|
||||
if (val2 != 0 || val < 1 || val > 10)
|
||||
return -EINVAL;
|
||||
mutex_lock(&data->mutex);
|
||||
ret = mma9551_update_config_bits(data->client,
|
||||
MMA9551_APPID_TILT,
|
||||
MMA9551_TILT_CFG_REG,
|
||||
MMA9551_TILT_ANG_THRESH_MASK,
|
||||
val);
|
||||
mutex_unlock(&data->mutex);
|
||||
return ret;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
static int mma9551_read_event_value(struct iio_dev *indio_dev,
|
||||
const struct iio_chan_spec *chan,
|
||||
enum iio_event_type type,
|
||||
enum iio_event_direction dir,
|
||||
enum iio_event_info info,
|
||||
int *val, int *val2)
|
||||
{
|
||||
struct mma9551_data *data = iio_priv(indio_dev);
|
||||
int ret;
|
||||
u8 tmp;
|
||||
|
||||
switch (chan->type) {
|
||||
case IIO_INCLI:
|
||||
mutex_lock(&data->mutex);
|
||||
ret = mma9551_read_config_byte(data->client,
|
||||
MMA9551_APPID_TILT,
|
||||
MMA9551_TILT_CFG_REG, &tmp);
|
||||
mutex_unlock(&data->mutex);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
*val = tmp & MMA9551_TILT_ANG_THRESH_MASK;
|
||||
*val2 = 0;
|
||||
return IIO_VAL_INT;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
static const struct iio_event_spec mma9551_incli_event = {
|
||||
.type = IIO_EV_TYPE_ROC,
|
||||
.dir = IIO_EV_DIR_RISING,
|
||||
.mask_separate = BIT(IIO_EV_INFO_ENABLE),
|
||||
.mask_shared_by_type = BIT(IIO_EV_INFO_VALUE),
|
||||
};
|
||||
|
||||
#define MMA9551_ACCEL_CHANNEL(axis) { \
|
||||
.type = IIO_ACCEL, \
|
||||
.modified = 1, \
|
||||
.channel2 = axis, \
|
||||
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
|
||||
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
|
||||
}
|
||||
|
||||
#define MMA9551_INCLI_CHANNEL(axis) { \
|
||||
.type = IIO_INCLI, \
|
||||
.modified = 1, \
|
||||
.channel2 = axis, \
|
||||
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
|
||||
.event_spec = &mma9551_incli_event, \
|
||||
.num_event_specs = 1, \
|
||||
}
|
||||
|
||||
static const struct iio_chan_spec mma9551_channels[] = {
|
||||
MMA9551_ACCEL_CHANNEL(IIO_MOD_X),
|
||||
MMA9551_ACCEL_CHANNEL(IIO_MOD_Y),
|
||||
MMA9551_ACCEL_CHANNEL(IIO_MOD_Z),
|
||||
|
||||
MMA9551_INCLI_CHANNEL(IIO_MOD_X),
|
||||
MMA9551_INCLI_CHANNEL(IIO_MOD_Y),
|
||||
MMA9551_INCLI_CHANNEL(IIO_MOD_Z),
|
||||
};
|
||||
|
||||
static const struct iio_info mma9551_info = {
|
||||
.driver_module = THIS_MODULE,
|
||||
.read_raw = mma9551_read_raw,
|
||||
.read_event_config = mma9551_read_event_config,
|
||||
.write_event_config = mma9551_write_event_config,
|
||||
.read_event_value = mma9551_read_event_value,
|
||||
.write_event_value = mma9551_write_event_value,
|
||||
};
|
||||
|
||||
static irqreturn_t mma9551_event_handler(int irq, void *private)
|
||||
{
|
||||
struct iio_dev *indio_dev = private;
|
||||
struct mma9551_data *data = iio_priv(indio_dev);
|
||||
int i, ret, mma_axis = -1;
|
||||
u16 reg;
|
||||
u8 val;
|
||||
|
||||
mutex_lock(&data->mutex);
|
||||
|
||||
for (i = 0; i < 3; i++)
|
||||
if (irq == data->irqs[i]) {
|
||||
mma_axis = i;
|
||||
break;
|
||||
}
|
||||
|
||||
if (mma_axis == -1) {
|
||||
/* IRQ was triggered on 4th line, which we don't use. */
|
||||
dev_warn(&data->client->dev,
|
||||
"irq triggered on unused line %d\n", data->irqs[3]);
|
||||
goto out;
|
||||
}
|
||||
|
||||
switch (mma_axis) {
|
||||
case mma9551_x:
|
||||
reg = MMA9551_TILT_YZ_ANG_REG;
|
||||
break;
|
||||
case mma9551_y:
|
||||
reg = MMA9551_TILT_XZ_ANG_REG;
|
||||
break;
|
||||
case mma9551_z:
|
||||
reg = MMA9551_TILT_XY_ANG_REG;
|
||||
break;
|
||||
}
|
||||
|
||||
/*
|
||||
* Read the angle even though we don't use it, otherwise we
|
||||
* won't get any further interrupts.
|
||||
*/
|
||||
ret = mma9551_read_status_byte(data->client, MMA9551_APPID_TILT,
|
||||
reg, &val);
|
||||
if (ret < 0) {
|
||||
dev_err(&data->client->dev,
|
||||
"error %d reading tilt register in IRQ\n", ret);
|
||||
goto out;
|
||||
}
|
||||
|
||||
iio_push_event(indio_dev,
|
||||
IIO_MOD_EVENT_CODE(IIO_INCLI, 0, (mma_axis + 1),
|
||||
IIO_EV_TYPE_ROC, IIO_EV_DIR_RISING),
|
||||
iio_get_time_ns());
|
||||
|
||||
out:
|
||||
mutex_unlock(&data->mutex);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static int mma9551_init(struct mma9551_data *data)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = mma9551_read_version(data->client);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* Power on chip and enable doze mode. */
|
||||
return mma9551_update_config_bits(data->client,
|
||||
MMA9551_APPID_SLEEP_WAKE,
|
||||
MMA9551_SLEEP_CFG,
|
||||
MMA9551_SLEEP_CFG_SCHEN | MMA9551_SLEEP_CFG_SNCEN,
|
||||
MMA9551_SLEEP_CFG_SCHEN);
|
||||
}
|
||||
|
||||
static int mma9551_gpio_probe(struct iio_dev *indio_dev)
|
||||
{
|
||||
struct gpio_desc *gpio;
|
||||
int i, ret;
|
||||
struct mma9551_data *data = iio_priv(indio_dev);
|
||||
struct device *dev = &data->client->dev;
|
||||
|
||||
for (i = 0; i < MMA9551_GPIO_COUNT; i++) {
|
||||
gpio = devm_gpiod_get_index(dev, MMA9551_GPIO_NAME, i);
|
||||
if (IS_ERR(gpio)) {
|
||||
dev_err(dev, "acpi gpio get index failed\n");
|
||||
return PTR_ERR(gpio);
|
||||
}
|
||||
|
||||
ret = gpiod_direction_input(gpio);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
data->irqs[i] = gpiod_to_irq(gpio);
|
||||
ret = devm_request_threaded_irq(dev, data->irqs[i],
|
||||
NULL, mma9551_event_handler,
|
||||
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
|
||||
MMA9551_IRQ_NAME, indio_dev);
|
||||
if (ret < 0) {
|
||||
dev_err(dev, "request irq %d failed\n", data->irqs[i]);
|
||||
return ret;
|
||||
}
|
||||
|
||||
dev_dbg(dev, "gpio resource, no:%d irq:%d\n",
|
||||
desc_to_gpio(gpio), data->irqs[i]);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const char *mma9551_match_acpi_device(struct device *dev)
|
||||
{
|
||||
const struct acpi_device_id *id;
|
||||
|
||||
id = acpi_match_device(dev->driver->acpi_match_table, dev);
|
||||
if (!id)
|
||||
return NULL;
|
||||
|
||||
return dev_name(dev);
|
||||
}
|
||||
|
||||
static int mma9551_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct mma9551_data *data;
|
||||
struct iio_dev *indio_dev;
|
||||
const char *name = NULL;
|
||||
int ret;
|
||||
|
||||
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
|
||||
if (!indio_dev)
|
||||
return -ENOMEM;
|
||||
|
||||
data = iio_priv(indio_dev);
|
||||
i2c_set_clientdata(client, indio_dev);
|
||||
data->client = client;
|
||||
|
||||
if (id)
|
||||
name = id->name;
|
||||
else if (ACPI_HANDLE(&client->dev))
|
||||
name = mma9551_match_acpi_device(&client->dev);
|
||||
|
||||
ret = mma9551_init(data);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
mutex_init(&data->mutex);
|
||||
|
||||
indio_dev->dev.parent = &client->dev;
|
||||
indio_dev->channels = mma9551_channels;
|
||||
indio_dev->num_channels = ARRAY_SIZE(mma9551_channels);
|
||||
indio_dev->name = name;
|
||||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
indio_dev->info = &mma9551_info;
|
||||
|
||||
ret = mma9551_gpio_probe(indio_dev);
|
||||
if (ret < 0)
|
||||
goto out_poweroff;
|
||||
|
||||
ret = iio_device_register(indio_dev);
|
||||
if (ret < 0) {
|
||||
dev_err(&client->dev, "unable to register iio device\n");
|
||||
goto out_poweroff;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
out_poweroff:
|
||||
mma9551_set_device_state(client, false);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int mma9551_remove(struct i2c_client *client)
|
||||
{
|
||||
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
||||
struct mma9551_data *data = iio_priv(indio_dev);
|
||||
|
||||
iio_device_unregister(indio_dev);
|
||||
mutex_lock(&data->mutex);
|
||||
mma9551_set_device_state(data->client, false);
|
||||
mutex_unlock(&data->mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM_SLEEP
|
||||
static int mma9551_suspend(struct device *dev)
|
||||
{
|
||||
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
|
||||
struct mma9551_data *data = iio_priv(indio_dev);
|
||||
|
||||
mutex_lock(&data->mutex);
|
||||
mma9551_set_device_state(data->client, false);
|
||||
mutex_unlock(&data->mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int mma9551_resume(struct device *dev)
|
||||
{
|
||||
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
|
||||
struct mma9551_data *data = iio_priv(indio_dev);
|
||||
|
||||
mutex_lock(&data->mutex);
|
||||
mma9551_set_device_state(data->client, true);
|
||||
mutex_unlock(&data->mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
#else
|
||||
#define mma9551_suspend NULL
|
||||
#define mma9551_resume NULL
|
||||
#endif
|
||||
|
||||
static const struct dev_pm_ops mma9551_pm_ops = {
|
||||
SET_SYSTEM_SLEEP_PM_OPS(mma9551_suspend, mma9551_resume)
|
||||
};
|
||||
|
||||
static const struct acpi_device_id mma9551_acpi_match[] = {
|
||||
{"MMA9551", 0},
|
||||
{},
|
||||
};
|
||||
|
||||
MODULE_DEVICE_TABLE(acpi, mma9551_acpi_match);
|
||||
|
||||
static const struct i2c_device_id mma9551_id[] = {
|
||||
{"mma9551", 0},
|
||||
{}
|
||||
};
|
||||
|
||||
MODULE_DEVICE_TABLE(i2c, mma9551_id);
|
||||
|
||||
static struct i2c_driver mma9551_driver = {
|
||||
.driver = {
|
||||
.name = MMA9551_DRV_NAME,
|
||||
.acpi_match_table = ACPI_PTR(mma9551_acpi_match),
|
||||
.pm = &mma9551_pm_ops,
|
||||
},
|
||||
.probe = mma9551_probe,
|
||||
.remove = mma9551_remove,
|
||||
.id_table = mma9551_id,
|
||||
};
|
||||
|
||||
module_i2c_driver(mma9551_driver);
|
||||
|
||||
MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
|
||||
MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_DESCRIPTION("MMA9551L motion-sensing platform driver");
|
||||
Loading…
Reference in New Issue
Block a user