807 lines
21 KiB
C
807 lines
21 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Common code for Freescale MMA955x Intelligent Sensor Platform drivers
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* Copyright (c) 2014, Intel Corporation.
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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/delay.h>
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#include <linux/iio/iio.h>
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#include <linux/pm_runtime.h>
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#include "mma9551_core.h"
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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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/* 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_FLEEN BIT(1)
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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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/* Reset/Suspend/Clear application */
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#define MMA9551_RSC_RESET 0x00
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#define MMA9551_RSC_OFFSET(mask) (3 - (ffs(mask) - 1) / 8)
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#define MMA9551_RSC_VAL(mask) (mask >> (((ffs(mask) - 1) / 8) * 8))
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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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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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/**
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* mma9551_read_config_byte() - read 1 configuration byte
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* @client: I2C client
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* @app_id: Application ID
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* @reg: Application register
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* @val: Pointer to store value read
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*
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* Read one configuration byte from the device using MMA955xL command format.
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* Commands to the MMA955xL platform consist of a write followed
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* by one or more reads.
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*
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* Locking note: This function must be called with the device lock held.
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* Locking is not handled inside the function. Callers should ensure they
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* serialize access to the HW.
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*
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* Returns: 0 on success, negative value on failure.
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*/
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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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EXPORT_SYMBOL_NS(mma9551_read_config_byte, IIO_MMA9551);
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/**
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* mma9551_write_config_byte() - write 1 configuration byte
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* @client: I2C client
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* @app_id: Application ID
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* @reg: Application register
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* @val: Value to write
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*
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* Write one configuration byte from the device using MMA955xL command format.
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* Commands to the MMA955xL platform consist of a write followed by one or
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* more reads.
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*
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* Locking note: This function must be called with the device lock held.
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* Locking is not handled inside the function. Callers should ensure they
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* serialize access to the HW.
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*
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* Returns: 0 on success, negative value on failure.
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*/
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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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EXPORT_SYMBOL_NS(mma9551_write_config_byte, IIO_MMA9551);
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/**
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* mma9551_read_status_byte() - read 1 status byte
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* @client: I2C client
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* @app_id: Application ID
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* @reg: Application register
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* @val: Pointer to store value read
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*
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* Read one status byte from the device using MMA955xL command format.
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* Commands to the MMA955xL platform consist of a write followed by one or
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* more reads.
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*
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* Locking note: This function must be called with the device lock held.
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* Locking is not handled inside the function. Callers should ensure they
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* serialize access to the HW.
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*
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* Returns: 0 on success, negative value on failure.
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*/
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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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EXPORT_SYMBOL_NS(mma9551_read_status_byte, IIO_MMA9551);
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/**
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* mma9551_read_config_word() - read 1 config word
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* @client: I2C client
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* @app_id: Application ID
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* @reg: Application register
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* @val: Pointer to store value read
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*
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* Read one configuration word from the device using MMA955xL command format.
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* Commands to the MMA955xL platform consist of a write followed by one or
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* more reads.
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*
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* Locking note: This function must be called with the device lock held.
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* Locking is not handled inside the function. Callers should ensure they
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* serialize access to the HW.
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*
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* Returns: 0 on success, negative value on failure.
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*/
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int mma9551_read_config_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_CONFIG,
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reg, NULL, 0, (u8 *)&v, 2);
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if (ret < 0)
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return ret;
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*val = be16_to_cpu(v);
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return 0;
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}
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EXPORT_SYMBOL_NS(mma9551_read_config_word, IIO_MMA9551);
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/**
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* mma9551_write_config_word() - write 1 config word
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* @client: I2C client
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* @app_id: Application ID
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* @reg: Application register
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* @val: Value to write
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*
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* Write one configuration word from the device using MMA955xL command format.
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* Commands to the MMA955xL platform consist of a write followed by one or
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* more reads.
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*
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* Locking note: This function must be called with the device lock held.
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* Locking is not handled inside the function. Callers should ensure they
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* serialize access to the HW.
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*
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* Returns: 0 on success, negative value on failure.
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*/
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int mma9551_write_config_word(struct i2c_client *client, u8 app_id,
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u16 reg, u16 val)
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{
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__be16 v = cpu_to_be16(val);
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return mma9551_transfer(client, app_id, MMA9551_CMD_WRITE_CONFIG, reg,
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(u8 *)&v, 2, NULL, 0);
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}
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EXPORT_SYMBOL_NS(mma9551_write_config_word, IIO_MMA9551);
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/**
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* mma9551_read_status_word() - read 1 status word
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* @client: I2C client
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* @app_id: Application ID
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* @reg: Application register
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* @val: Pointer to store value read
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*
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* Read one status word from the device using MMA955xL command format.
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* Commands to the MMA955xL platform consist of a write followed by one or
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* more reads.
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*
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* Locking note: This function must be called with the device lock held.
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* Locking is not handled inside the function. Callers should ensure they
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* serialize access to the HW.
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*
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* Returns: 0 on success, negative value on failure.
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*/
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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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if (ret < 0)
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return ret;
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*val = be16_to_cpu(v);
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return 0;
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}
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EXPORT_SYMBOL_NS(mma9551_read_status_word, IIO_MMA9551);
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/**
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* mma9551_read_config_words() - read multiple config words
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* @client: I2C client
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* @app_id: Application ID
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* @reg: Application register
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* @len: Length of array to read (in words)
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* @buf: Array of words to read
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*
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* Read multiple configuration registers (word-sized registers).
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*
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* Locking note: This function must be called with the device lock held.
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* Locking is not handled inside the function. Callers should ensure they
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* serialize access to the HW.
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*
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* Returns: 0 on success, negative value on failure.
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*/
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int mma9551_read_config_words(struct i2c_client *client, u8 app_id,
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u16 reg, u8 len, u16 *buf)
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{
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int ret, i;
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__be16 be_buf[MMA9551_MAX_MAILBOX_DATA_REGS / 2];
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if (len > ARRAY_SIZE(be_buf)) {
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dev_err(&client->dev, "Invalid buffer size %d\n", len);
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return -EINVAL;
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}
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ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_CONFIG,
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reg, NULL, 0, (u8 *)be_buf, len * sizeof(u16));
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if (ret < 0)
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return ret;
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for (i = 0; i < len; i++)
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buf[i] = be16_to_cpu(be_buf[i]);
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return 0;
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}
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EXPORT_SYMBOL_NS(mma9551_read_config_words, IIO_MMA9551);
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/**
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* mma9551_read_status_words() - read multiple status words
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* @client: I2C client
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* @app_id: Application ID
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* @reg: Application register
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* @len: Length of array to read (in words)
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* @buf: Array of words to read
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*
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* Read multiple status registers (word-sized registers).
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*
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* Locking note: This function must be called with the device lock held.
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* Locking is not handled inside the function. Callers should ensure they
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* serialize access to the HW.
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*
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* Returns: 0 on success, negative value on failure.
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*/
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int mma9551_read_status_words(struct i2c_client *client, u8 app_id,
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u16 reg, u8 len, u16 *buf)
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{
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int ret, i;
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__be16 be_buf[MMA9551_MAX_MAILBOX_DATA_REGS / 2];
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if (len > ARRAY_SIZE(be_buf)) {
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dev_err(&client->dev, "Invalid buffer size %d\n", len);
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return -EINVAL;
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}
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ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_STATUS,
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reg, NULL, 0, (u8 *)be_buf, len * sizeof(u16));
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if (ret < 0)
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return ret;
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for (i = 0; i < len; i++)
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buf[i] = be16_to_cpu(be_buf[i]);
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return 0;
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}
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EXPORT_SYMBOL_NS(mma9551_read_status_words, IIO_MMA9551);
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/**
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* mma9551_write_config_words() - write multiple config words
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* @client: I2C client
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* @app_id: Application ID
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* @reg: Application register
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* @len: Length of array to write (in words)
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* @buf: Array of words to write
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*
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* Write multiple configuration registers (word-sized registers).
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*
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* Locking note: This function must be called with the device lock held.
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* Locking is not handled inside the function. Callers should ensure they
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* serialize access to the HW.
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*
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* Returns: 0 on success, negative value on failure.
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*/
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int mma9551_write_config_words(struct i2c_client *client, u8 app_id,
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u16 reg, u8 len, u16 *buf)
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{
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int i;
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__be16 be_buf[(MMA9551_MAX_MAILBOX_DATA_REGS - 1) / 2];
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if (len > ARRAY_SIZE(be_buf)) {
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dev_err(&client->dev, "Invalid buffer size %d\n", len);
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return -EINVAL;
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}
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for (i = 0; i < len; i++)
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be_buf[i] = cpu_to_be16(buf[i]);
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return mma9551_transfer(client, app_id, MMA9551_CMD_WRITE_CONFIG,
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reg, (u8 *)be_buf, len * sizeof(u16), NULL, 0);
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}
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EXPORT_SYMBOL_NS(mma9551_write_config_words, IIO_MMA9551);
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/**
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* mma9551_update_config_bits() - update bits in register
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* @client: I2C client
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* @app_id: Application ID
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* @reg: Application register
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* @mask: Mask for the bits to update
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* @val: Value of the bits to update
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*
|
||
* Update bits in the given register using a bit mask.
|
||
*
|
||
* Locking note: This function must be called with the device lock held.
|
||
* Locking is not handled inside the function. Callers should ensure they
|
||
* serialize access to the HW.
|
||
*
|
||
* Returns: 0 on success, negative value on failure.
|
||
*/
|
||
int mma9551_update_config_bits(struct i2c_client *client, u8 app_id,
|
||
u16 reg, u8 mask, u8 val)
|
||
{
|
||
int ret;
|
||
u8 tmp, orig;
|
||
|
||
ret = mma9551_read_config_byte(client, app_id, reg, &orig);
|
||
if (ret < 0)
|
||
return ret;
|
||
|
||
tmp = orig & ~mask;
|
||
tmp |= val & mask;
|
||
|
||
if (tmp == orig)
|
||
return 0;
|
||
|
||
return mma9551_write_config_byte(client, app_id, reg, tmp);
|
||
}
|
||
EXPORT_SYMBOL_NS(mma9551_update_config_bits, IIO_MMA9551);
|
||
|
||
/**
|
||
* mma9551_gpio_config() - configure gpio
|
||
* @client: I2C client
|
||
* @pin: GPIO pin to configure
|
||
* @app_id: Application ID
|
||
* @bitnum: Bit number of status register being assigned to the GPIO pin.
|
||
* @polarity: The polarity parameter is described in section 6.2.2, page 66,
|
||
* of the Software Reference Manual. Basically, polarity=0 means
|
||
* the interrupt line has the same value as the selected bit,
|
||
* while polarity=1 means the line is inverted.
|
||
*
|
||
* Assign a bit from an application’s status register to a specific GPIO pin.
|
||
*
|
||
* Locking note: This function must be called with the device lock held.
|
||
* Locking is not handled inside the function. Callers should ensure they
|
||
* serialize access to the HW.
|
||
*
|
||
* Returns: 0 on success, negative value on failure.
|
||
*/
|
||
int mma9551_gpio_config(struct i2c_client *client, enum mma9551_gpio_pin pin,
|
||
u8 app_id, u8 bitnum, int polarity)
|
||
{
|
||
u8 reg, pol_mask, pol_val;
|
||
int ret;
|
||
|
||
if (pin > mma9551_gpio_max) {
|
||
dev_err(&client->dev, "bad GPIO pin\n");
|
||
return -EINVAL;
|
||
}
|
||
|
||
/*
|
||
* Pin 6 is configured by regs 0x00 and 0x01, pin 7 by 0x02 and
|
||
* 0x03, and so on.
|
||
*/
|
||
reg = pin * 2;
|
||
|
||
ret = mma9551_write_config_byte(client, MMA9551_APPID_GPIO,
|
||
reg, app_id);
|
||
if (ret < 0) {
|
||
dev_err(&client->dev, "error setting GPIO app_id\n");
|
||
return ret;
|
||
}
|
||
|
||
ret = mma9551_write_config_byte(client, MMA9551_APPID_GPIO,
|
||
reg + 1, bitnum);
|
||
if (ret < 0) {
|
||
dev_err(&client->dev, "error setting GPIO bit number\n");
|
||
return ret;
|
||
}
|
||
|
||
switch (pin) {
|
||
case mma9551_gpio6:
|
||
reg = MMA9551_GPIO_POL_LSB;
|
||
pol_mask = 1 << 6;
|
||
break;
|
||
case mma9551_gpio7:
|
||
reg = MMA9551_GPIO_POL_LSB;
|
||
pol_mask = 1 << 7;
|
||
break;
|
||
case mma9551_gpio8:
|
||
reg = MMA9551_GPIO_POL_MSB;
|
||
pol_mask = 1 << 0;
|
||
break;
|
||
case mma9551_gpio9:
|
||
reg = MMA9551_GPIO_POL_MSB;
|
||
pol_mask = 1 << 1;
|
||
break;
|
||
}
|
||
pol_val = polarity ? pol_mask : 0;
|
||
|
||
ret = mma9551_update_config_bits(client, MMA9551_APPID_GPIO, reg,
|
||
pol_mask, pol_val);
|
||
if (ret < 0)
|
||
dev_err(&client->dev, "error setting GPIO polarity\n");
|
||
|
||
return ret;
|
||
}
|
||
EXPORT_SYMBOL_NS(mma9551_gpio_config, IIO_MMA9551);
|
||
|
||
/**
|
||
* mma9551_read_version() - read device version information
|
||
* @client: I2C client
|
||
*
|
||
* Read version information and print device id and firmware version.
|
||
*
|
||
* Locking note: This function must be called with the device lock held.
|
||
* Locking is not handled inside the function. Callers should ensure they
|
||
* serialize access to the HW.
|
||
*
|
||
* Returns: 0 on success, negative value on failure.
|
||
*/
|
||
int mma9551_read_version(struct i2c_client *client)
|
||
{
|
||
struct mma9551_version_info info;
|
||
int ret;
|
||
|
||
ret = mma9551_transfer(client, MMA9551_APPID_VERSION, 0x00, 0x00,
|
||
NULL, 0, (u8 *)&info, sizeof(info));
|
||
if (ret < 0)
|
||
return ret;
|
||
|
||
dev_info(&client->dev, "device ID 0x%x, firmware version %02x.%02x\n",
|
||
be32_to_cpu(info.device_id), info.fw_version[0],
|
||
info.fw_version[1]);
|
||
|
||
return 0;
|
||
}
|
||
EXPORT_SYMBOL_NS(mma9551_read_version, IIO_MMA9551);
|
||
|
||
/**
|
||
* mma9551_set_device_state() - sets HW power mode
|
||
* @client: I2C client
|
||
* @enable: Use true to power on device, false to cause the device
|
||
* to enter sleep.
|
||
*
|
||
* Set power on/off for device using the Sleep/Wake Application.
|
||
* When enable is true, power on chip and enable doze mode.
|
||
* When enable is false, enter sleep mode (device remains in the
|
||
* lowest-power mode).
|
||
*
|
||
* Locking note: This function must be called with the device lock held.
|
||
* Locking is not handled inside the function. Callers should ensure they
|
||
* serialize access to the HW.
|
||
*
|
||
* Returns: 0 on success, negative value on failure.
|
||
*/
|
||
int mma9551_set_device_state(struct i2c_client *client, bool enable)
|
||
{
|
||
return mma9551_update_config_bits(client, MMA9551_APPID_SLEEP_WAKE,
|
||
MMA9551_SLEEP_CFG,
|
||
MMA9551_SLEEP_CFG_SNCEN |
|
||
MMA9551_SLEEP_CFG_FLEEN |
|
||
MMA9551_SLEEP_CFG_SCHEN,
|
||
enable ? MMA9551_SLEEP_CFG_SCHEN |
|
||
MMA9551_SLEEP_CFG_FLEEN :
|
||
MMA9551_SLEEP_CFG_SNCEN);
|
||
}
|
||
EXPORT_SYMBOL_NS(mma9551_set_device_state, IIO_MMA9551);
|
||
|
||
/**
|
||
* mma9551_set_power_state() - sets runtime PM state
|
||
* @client: I2C client
|
||
* @on: Use true to power on device, false to power off
|
||
*
|
||
* Resume or suspend the device using Runtime PM.
|
||
* The device will suspend after the autosuspend delay.
|
||
*
|
||
* Returns: 0 on success, negative value on failure.
|
||
*/
|
||
int mma9551_set_power_state(struct i2c_client *client, bool on)
|
||
{
|
||
#ifdef CONFIG_PM
|
||
int ret;
|
||
|
||
if (on)
|
||
ret = pm_runtime_resume_and_get(&client->dev);
|
||
else {
|
||
pm_runtime_mark_last_busy(&client->dev);
|
||
ret = pm_runtime_put_autosuspend(&client->dev);
|
||
}
|
||
|
||
if (ret < 0) {
|
||
dev_err(&client->dev,
|
||
"failed to change power state to %d\n", on);
|
||
|
||
return ret;
|
||
}
|
||
#endif
|
||
|
||
return 0;
|
||
}
|
||
EXPORT_SYMBOL_NS(mma9551_set_power_state, IIO_MMA9551);
|
||
|
||
/**
|
||
* mma9551_sleep() - sleep
|
||
* @freq: Application frequency
|
||
*
|
||
* Firmware applications run at a certain frequency on the
|
||
* device. Sleep for one application cycle to make sure the
|
||
* application had time to run once and initialize set values.
|
||
*/
|
||
void mma9551_sleep(int freq)
|
||
{
|
||
int sleep_val = 1000 / freq;
|
||
|
||
if (sleep_val < 20)
|
||
usleep_range(sleep_val * 1000, 20000);
|
||
else
|
||
msleep_interruptible(sleep_val);
|
||
}
|
||
EXPORT_SYMBOL_NS(mma9551_sleep, IIO_MMA9551);
|
||
|
||
/**
|
||
* mma9551_read_accel_chan() - read accelerometer channel
|
||
* @client: I2C client
|
||
* @chan: IIO channel
|
||
* @val: Pointer to the accelerometer value read
|
||
* @val2: Unused
|
||
*
|
||
* Read accelerometer value for the specified channel.
|
||
*
|
||
* Locking note: This function must be called with the device lock held.
|
||
* Locking is not handled inside the function. Callers should ensure they
|
||
* serialize access to the HW.
|
||
*
|
||
* Returns: IIO_VAL_INT on success, negative value on failure.
|
||
*/
|
||
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_set_power_state(client, true);
|
||
if (ret < 0)
|
||
return ret;
|
||
|
||
ret = mma9551_read_status_word(client, MMA9551_APPID_AFE,
|
||
reg_addr, &raw_accel);
|
||
if (ret < 0)
|
||
goto out_poweroff;
|
||
|
||
*val = raw_accel;
|
||
|
||
ret = IIO_VAL_INT;
|
||
|
||
out_poweroff:
|
||
mma9551_set_power_state(client, false);
|
||
return ret;
|
||
}
|
||
EXPORT_SYMBOL_NS(mma9551_read_accel_chan, IIO_MMA9551);
|
||
|
||
/**
|
||
* mma9551_read_accel_scale() - read accelerometer scale
|
||
* @val: Pointer to the accelerometer scale (int value)
|
||
* @val2: Pointer to the accelerometer scale (micro value)
|
||
*
|
||
* Read accelerometer scale.
|
||
*
|
||
* Returns: IIO_VAL_INT_PLUS_MICRO.
|
||
*/
|
||
int mma9551_read_accel_scale(int *val, int *val2)
|
||
{
|
||
*val = 0;
|
||
*val2 = 2440;
|
||
|
||
return IIO_VAL_INT_PLUS_MICRO;
|
||
}
|
||
EXPORT_SYMBOL_NS(mma9551_read_accel_scale, IIO_MMA9551);
|
||
|
||
/**
|
||
* mma9551_app_reset() - reset application
|
||
* @client: I2C client
|
||
* @app_mask: Application to reset
|
||
*
|
||
* Reset the given application (using the Reset/Suspend/Clear
|
||
* Control Application)
|
||
*
|
||
* Returns: 0 on success, negative value on failure.
|
||
*/
|
||
int mma9551_app_reset(struct i2c_client *client, u32 app_mask)
|
||
{
|
||
return mma9551_write_config_byte(client, MMA9551_APPID_RSC,
|
||
MMA9551_RSC_RESET +
|
||
MMA9551_RSC_OFFSET(app_mask),
|
||
MMA9551_RSC_VAL(app_mask));
|
||
}
|
||
EXPORT_SYMBOL_NS(mma9551_app_reset, IIO_MMA9551);
|
||
|
||
MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
|
||
MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
|
||
MODULE_LICENSE("GPL v2");
|
||
MODULE_DESCRIPTION("MMA955xL sensors core");
|