From fcf7572147afec5808f6425dd2468a968693bfd5 Mon Sep 17 00:00:00 2001 From: lhh Date: Fri, 21 Jan 2011 17:44:23 +0800 Subject: [PATCH] updata sdmmc and ak8975 --- arch/arm/mach-rk29/board-rk29sdk.c | 2 +- arch/arm/mach-rk29/include/mach/board.h | 7 + drivers/mmc/host/rk29_sdmmc.c | 26 +- drivers/staging/iio/magnetometer/ak8975.c | 1397 +++++++++++++-------- 4 files changed, 927 insertions(+), 505 deletions(-) diff --git a/arch/arm/mach-rk29/board-rk29sdk.c b/arch/arm/mach-rk29/board-rk29sdk.c index a4fc43477362..46d7998aa8ab 100755 --- a/arch/arm/mach-rk29/board-rk29sdk.c +++ b/arch/arm/mach-rk29/board-rk29sdk.c @@ -507,7 +507,7 @@ static struct i2c_board_info __initdata board_i2c0_devices[] = { #if defined (CONFIG_SENSORS_AK8975) { .type = "ak8975", - .addr = 0x1d, + .addr = 0x0d, .flags = 0, .irq = RK29_PIN0_PA4, }, diff --git a/arch/arm/mach-rk29/include/mach/board.h b/arch/arm/mach-rk29/include/mach/board.h index 9c5f57bcaa36..eaa56d7895cf 100755 --- a/arch/arm/mach-rk29/include/mach/board.h +++ b/arch/arm/mach-rk29/include/mach/board.h @@ -159,6 +159,13 @@ struct it7260_platform_data { }; +struct akm8975_platform_data { + char layouts[3][3]; + char project_name[64]; + int gpio_DRDY; +}; + + void __init rk29_map_common_io(void); void __init rk29_clock_init(void); diff --git a/drivers/mmc/host/rk29_sdmmc.c b/drivers/mmc/host/rk29_sdmmc.c index 4ab9a1f603d0..570c5b02bb06 100755 --- a/drivers/mmc/host/rk29_sdmmc.c +++ b/drivers/mmc/host/rk29_sdmmc.c @@ -41,7 +41,7 @@ #include "rk2818-sdmmc.h" -#define RK29_SDMMC_DATA_ERROR_FLAGS (SDMMC_INT_DRTO | SDMMC_INT_DCRC | SDMMC_INT_HTO | SDMMC_INT_SBE | SDMMC_INT_EBE) +#define RK29_SDMMC_DATA_ERROR_FLAGS (SDMMC_INT_DRTO | SDMMC_INT_DCRC | SDMMC_INT_HTO | SDMMC_INT_SBE | SDMMC_INT_EBE | SDMMC_INT_FRUN) #define RK29_SDMMC_CMD_ERROR_FLAGS (SDMMC_INT_RTO | SDMMC_INT_RCRC | SDMMC_INT_RE | SDMMC_INT_HLE) #define RK29_SDMMC_ERROR_FLAGS (RK29_SDMMC_DATA_ERROR_FLAGS | RK29_SDMMC_CMD_ERROR_FLAGS | SDMMC_INT_HLE) #define RK29_SDMMC_SEND_STATUS 1 @@ -310,6 +310,8 @@ static u32 rk29_sdmmc_prepare_command(struct mmc_host *mmc, if(cmdr == 12) cmdr |= SDMMC_CMD_STOP; + else if(cmdr == 13) + cmdr &= ~SDMMC_CMD_PRV_DAT_WAIT; else cmdr |= SDMMC_CMD_PRV_DAT_WAIT; @@ -338,12 +340,15 @@ static void rk29_sdmmc_start_command(struct rk29_sdmmc *host, struct mmc_command *cmd, u32 cmd_flags) { int tmo = 5000; + unsigned long flags; host->cmd = cmd; dev_vdbg(&host->pdev->dev, "start cmd:%d ARGR=0x%08x CMDR=0x%08x\n", cmd->opcode, cmd->arg, cmd_flags); + local_irq_save(flags); rk29_sdmmc_write(host->regs, SDMMC_CMDARG, cmd->arg); // write to SDMMC_CMDARG register rk29_sdmmc_write(host->regs, SDMMC_CMD, cmd_flags | SDMMC_CMD_START); // write to SDMMC_CMD register + local_irq_restore(flags); /* wait until CIU accepts the command */ while (--tmo && (rk29_sdmmc_read(host->regs, SDMMC_CMD) & SDMMC_CMD_START)) @@ -374,10 +379,10 @@ static int rk29_sdmmc_wait_unbusy(struct rk29_sdmmc *host) time_out--; if (!time_out) { time_out = time_out_us; - rk29_sdmmc_reset_fifo(host); - time_out2--; + rk29_sdmmc_reset_fifo(host); if (!time_out2) break; + time_out2--; } } @@ -775,6 +780,8 @@ static void rk29_sdmmc_command_complete(struct rk29_sdmmc *host, cmd->error = -EILSEQ; else if (status & SDMMC_INT_RE) cmd->error = -EIO; + else if(status & SDMMC_INT_HLE) + cmd->error = -EIO; else cmd->error = 0; @@ -869,8 +876,7 @@ static void rk29_sdmmc_tasklet_func(unsigned long priv) status); data->error = -EIO; } - } - else { + }else { data->bytes_xfered = data->blocks * data->blksz; data->error = 0; } @@ -1133,16 +1139,17 @@ static irqreturn_t rk29_sdmmc_interrupt(int irq, void *dev_id) if (!pending) break; if(pending & SDMMC_INT_CD) { - writel(SDMMC_INT_CD, host->regs + SDMMC_RINTSTS); // clear sd detect int + rk29_sdmmc_write(host->regs, SDMMC_RINTSTS, SDMMC_INT_CD); // clear sd detect int present = rk29_sdmmc_get_cd(host->mmc); present_old = test_bit(RK29_SDMMC_CARD_PRESENT, &host->flags); if(present != present_old) { if (present != 0) { set_bit(RK29_SDMMC_CARD_PRESENT, &host->flags); - } else { + mod_timer(&host->detect_timer, jiffies + msecs_to_jiffies(200)); + } else { clear_bit(RK29_SDMMC_CARD_PRESENT, &host->flags); + mod_timer(&host->detect_timer, jiffies + msecs_to_jiffies(10)); } - mod_timer(&host->detect_timer, jiffies + msecs_to_jiffies(100)); } } if(pending & RK29_SDMMC_CMD_ERROR_FLAGS) { @@ -1161,7 +1168,6 @@ static irqreturn_t rk29_sdmmc_interrupt(int irq, void *dev_id) tasklet_schedule(&host->tasklet); } - if(pending & SDMMC_INT_DTO) { rk29_sdmmc_write(host->regs, SDMMC_RINTSTS,SDMMC_INT_DTO); // clear interrupt if (!host->data_status) @@ -1209,7 +1215,7 @@ static irqreturn_t rk29_sdmmc_interrupt(int irq, void *dev_id) static void rk29_sdmmc_detect_change(unsigned long data) { struct mmc_request *mrq; - struct rk29_sdmmc *host = (struct rk29_sdmmc *)data;; + struct rk29_sdmmc *host = (struct rk29_sdmmc *)data; smp_rmb(); if (test_bit(RK29_SDMMC_SHUTDOWN, &host->flags)) diff --git a/drivers/staging/iio/magnetometer/ak8975.c b/drivers/staging/iio/magnetometer/ak8975.c index 644615243150..78210a1d9e11 100644 --- a/drivers/staging/iio/magnetometer/ak8975.c +++ b/drivers/staging/iio/magnetometer/ak8975.c @@ -1,501 +1,910 @@ +/* drivers/i2c/chips/akm8975.c - akm8975 compass driver + * + * Copyright (C) 2007-2008 HTC Corporation. + * Author: Hou-Kun Chen + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * 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. + * + */ + /* - * A sensor driver for the magnetometer AK8975. + * Revised by AKM 2009/04/02 * - * Magnetic compass sensor driver for monitoring magnetic flux information. - * - * Copyright (c) 2010, NVIDIA Corporation. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. - */ - -#include -#include -#include -#include -#include -#include -#include - -#include - -#include "../iio.h" -#include "magnet.h" - -/* - * Register definitions, as well as various shifts and masks to get at the - * individual fields of the registers. - */ -#define AK8975_REG_WIA 0x00 -#define AK8975_DEVICE_ID 0x48 - -#define AK8975_REG_INFO 0x01 - -#define AK8975_REG_ST1 0x02 -#define AK8975_REG_ST1_DRDY_SHIFT 0 -#define AK8975_REG_ST1_DRDY_MASK (1 << AK8975_REG_ST1_DRDY_SHIFT) - -#define AK8975_REG_HXL 0x03 -#define AK8975_REG_HXH 0x04 -#define AK8975_REG_HYL 0x05 -#define AK8975_REG_HYH 0x06 -#define AK8975_REG_HZL 0x07 -#define AK8975_REG_HZH 0x08 -#define AK8975_REG_ST2 0x09 -#define AK8975_REG_ST2_DERR_SHIFT 2 -#define AK8975_REG_ST2_DERR_MASK (1 << AK8975_REG_ST2_DERR_SHIFT) - -#define AK8975_REG_ST2_HOFL_SHIFT 3 -#define AK8975_REG_ST2_HOFL_MASK (1 << AK8975_REG_ST2_HOFL_SHIFT) - -#define AK8975_REG_CNTL 0x0A -#define AK8975_REG_CNTL_MODE_SHIFT 0 -#define AK8975_REG_CNTL_MODE_MASK (0xF << AK8975_REG_CNTL_MODE_SHIFT) -#define AK8975_REG_CNTL_MODE_POWER_DOWN 0 -#define AK8975_REG_CNTL_MODE_ONCE 1 -#define AK8975_REG_CNTL_MODE_SELF_TEST 8 -#define AK8975_REG_CNTL_MODE_FUSE_ROM 0xF - -#define AK8975_REG_RSVC 0x0B -#define AK8975_REG_ASTC 0x0C -#define AK8975_REG_TS1 0x0D -#define AK8975_REG_TS2 0x0E -#define AK8975_REG_I2CDIS 0x0F -#define AK8975_REG_ASAX 0x10 -#define AK8975_REG_ASAY 0x11 -#define AK8975_REG_ASAZ 0x12 - -#define AK8975_MAX_REGS AK8975_REG_ASAZ - -/* - * Miscellaneous values. - */ -#define AK8975_MAX_CONVERSION_TRIAL 5 -#define AK8975_MAX_CONVERSION_TIMEOUT 500 -#define AK8975_CONVERSION_DONE_POLL_TIME 10 - -/* - * Per-instance context data for the device. - */ -struct ak8975_data { + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "ak8975.h" + +#define AKM8975_DEBUG 1 +#define AKM8975_DEBUG_MSG 1 +#define AKM8975_DEBUG_FUNC 0 +#define AKM8975_DEBUG_DATA 0 +#define MAX_FAILURE_COUNT 3 +#define AKM8975_RETRY_COUNT 10 +#define AKM8975_DEFAULT_DELAY 100 + +#if AKM8975_DEBUG_MSG +#define AKMDBG(format, ...) printk(KERN_INFO "AKM8975 " format "\n", ## __VA_ARGS__) +#else +#define AKMDBG(format, ...) +#endif + +#if AKM8975_DEBUG_FUNC +#define AKMFUNC(func) printk(KERN_INFO "AKM8975 " func " is called\n") +#else +#define AKMFUNC(func) +#endif + +static struct i2c_client *this_client; + +struct akm8975_data { struct i2c_client *client; - struct iio_dev *indio_dev; - struct attribute_group attrs; - struct mutex lock; - u8 asa[3]; - unsigned long mode; - u8 reg_cache[AK8975_MAX_REGS]; - int eoc_gpio; + struct input_dev *input_dev; + struct work_struct work; + struct early_suspend akm_early_suspend; int eoc_irq; -}; - -/* - * Helper function to write to the I2C device's registers. - */ -static bool ak8975_write_data(struct i2c_client *client, - u8 reg, u8 val, u8 mask, u8 shift) -{ - u8 regval; - struct i2c_msg msg; - u8 w_data[2]; - int ret = 0; - - struct ak8975_data *data = i2c_get_clientdata(client); - - regval = data->reg_cache[reg]; - regval &= ~mask; - regval |= val << shift; - - w_data[0] = reg; - w_data[1] = regval; - - msg.addr = client->addr; - msg.flags = 0; - msg.len = 2; - msg.buf = w_data; - - ret = i2c_transfer(client->adapter, &msg, 1); - if (ret < 0) { - dev_err(&client->dev, "Write to device fails status %x\n", ret); - return false; - } - data->reg_cache[reg] = regval; - - return true; -} - -/* - * Helper function to read a contiguous set of the I2C device's registers. - */ -static bool ak8975_read_data(struct i2c_client *client, - u8 reg, u8 length, u8 *buffer) -{ - struct i2c_msg msg[2]; - u8 w_data[2]; - int ret = 0; - - w_data[0] = reg; - - msg[0].addr = client->addr; - msg[0].flags = I2C_M_NOSTART; /* set repeated start and write */ - msg[0].len = 1; - msg[0].buf = w_data; - - msg[1].addr = client->addr; - msg[1].flags = I2C_M_RD; - msg[1].len = length; - msg[1].buf = buffer; - - ret = i2c_transfer(client->adapter, msg, 2); - if (ret < 0) { - dev_err(&client->dev, "Read from device fails\n"); - return false; - } - - return true; -} - -/* - * Perform some start-of-day setup, including reading the asa calibration - * values and caching them. - */ -static int ak8975_setup(struct i2c_client *client) -{ - struct ak8975_data *data = i2c_get_clientdata(client); - u8 device_id; - u8 buffer[3]; - bool status; - - /* Confirm that the device we're talking to is really an AK8975. */ - status = ak8975_read_data(client, AK8975_REG_WIA, 1, &device_id); - if ((!status) || (device_id != AK8975_DEVICE_ID)) { - dev_err(&client->dev, "Device ak8975 not found\n"); - return -ENODEV; - } - - /* Write the fused rom access mode. */ - status = ak8975_write_data(client, AK8975_REG_CNTL, AK8975_REG_CNTL_MODE_FUSE_ROM, AK8975_REG_CNTL_MODE_MASK, AK8975_REG_CNTL_MODE_SHIFT); - if (!status) { - dev_err(&client->dev, "Error in setting fuse access mode\n"); - return false; - } - - /* Get asa data and store in the device data. */ - status = ak8975_read_data(client, AK8975_REG_ASAX, 3, buffer); - if (!status) { - dev_err(&client->dev, "Not able to read asa data\n"); - return -ENODEV; - } - - data->asa[0] = buffer[0] & 0xFF; - data->asa[1] = buffer[1] & 0xFF; - data->asa[2] = buffer[2] & 0xFF; - - return 0; -} - -/* - * Shows the device's mode. 0 = off, 1 = on. - */ -static ssize_t show_mode(struct device *dev, struct device_attribute *devattr, - char *buf) -{ - struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct ak8975_data *data = indio_dev->dev_data; - - return sprintf(buf, "%lu\n", data->mode); -} - -/* - * Sets the device's mode. 0 = off, 1 = on. The device's mode must be on - * for the magn raw attributes to be available. - */ -static ssize_t store_mode(struct device *dev, struct device_attribute *devattr, - const char *buf, size_t count) -{ - struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct ak8975_data *data = indio_dev->dev_data; - struct i2c_client *client = data->client; - unsigned long oval; - bool status; - - /* Convert mode string and do some basic sanity checking on it. - only 0 or 1 are valid. */ - if (strict_strtol(buf, 10, &oval)) - return -EINVAL; - - if ((oval < 0) || (oval > 1)) { - dev_err(dev, "mode value is not supported\n"); - return -EINVAL; - } - - mutex_lock(&data->lock); - - /* Write the mode to the device. */ - if (data->mode != oval) { - status = ak8975_write_data(client, AK8975_REG_CNTL, (u8)oval, AK8975_REG_CNTL_MODE_MASK, AK8975_REG_CNTL_MODE_SHIFT); - if (!status) { - dev_err(&client->dev, "Error in setting mode\n"); - mutex_unlock(&data->lock); - return -EINVAL; - } - data->mode = oval; - } - - mutex_unlock(&data->lock); - - return count; -} - -/* - * Emits the ASA sensitivity adjustment value for the x, y, or z axis. - * These ASA values are read from the sensor device at start of day, and - * cached in the device context struct. - */ -static ssize_t show_calibscale(struct device *dev, - struct device_attribute *devattr, char *buf) -{ - struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct ak8975_data *data = indio_dev->dev_data; - struct iio_dev_attr *this_attr = to_iio_dev_attr(devattr); - - if (!data) { - dev_err(dev, "No device found\n"); - return -ENODEV; - } - - return sprintf(buf, "%d\n", data->asa[this_attr->address]); -} - -/* - * Emits the raw flux value for the x, y, or z axis. - * - * Adjusting the flux value with the sensitivity adjustment value should be - * done via the following formula: - * - * Hadj = H * ( ( ( (ASA-128)*0.5 ) / 128 ) + 1 ) - * - * where H is the raw value, ASA is the sensitivity adjustment, and Hadj - * is the resultant adjusted value. - */ -static ssize_t show_raw(struct device *dev, struct device_attribute *devattr, - char *buf) -{ - struct iio_dev *indio_dev = dev_get_drvdata(dev); - struct ak8975_data *data = indio_dev->dev_data; - struct i2c_client *client = data->client; - struct iio_dev_attr *this_attr = to_iio_dev_attr(devattr); - u32 timeout_ms = AK8975_MAX_CONVERSION_TIMEOUT; - u16 meas_reg; - s16 raw; - u8 read_status; - bool status; - int state; - - /* Set up the device for taking a sample. */ - status = ak8975_write_data(client, AK8975_REG_CNTL, AK8975_REG_CNTL_MODE_ONCE, AK8975_REG_CNTL_MODE_MASK, AK8975_REG_CNTL_MODE_SHIFT); - if (!status) { - dev_err(&client->dev, "Error in setting operating mode\n"); - return false; - } - - /* Wait for the conversion to complete. */ - while (timeout_ms) { - msleep(AK8975_CONVERSION_DONE_POLL_TIME); - state = (gpio_get_value(data->eoc_gpio) ? 1 : 0); - if (state) - break; - timeout_ms -= AK8975_CONVERSION_DONE_POLL_TIME; - } - if (!timeout_ms) { - dev_err(&client->dev, "Conversion timeout happend\n"); - return false; - } - - status = ak8975_read_data(client, AK8975_REG_ST1, 1, &read_status); - if (!status) { - dev_err(&client->dev, "Error in reading ST1\n"); - return false; - } - - if (read_status & AK8975_REG_ST1_DRDY_MASK) { - status = ak8975_read_data(client, AK8975_REG_ST2, 1, &read_status); - if (!status) { - dev_err(&client->dev, "Error in reading ST2\n"); - return false; - } - if (read_status & (AK8975_REG_ST2_DERR_MASK | AK8975_REG_ST2_HOFL_MASK)) { - dev_err(&client->dev, "ST2 status error 0x%x\n", - read_status); - return false; - } +}; + +/* Addresses to scan -- protected by sense_data_mutex */ +static char sense_data[SENSOR_DATA_SIZE]; +static struct mutex sense_data_mutex; +static DECLARE_WAIT_QUEUE_HEAD(data_ready_wq); +static DECLARE_WAIT_QUEUE_HEAD(open_wq); + +static atomic_t data_ready; +static atomic_t open_count; +static atomic_t open_flag; +static atomic_t reserve_open_flag; + +static atomic_t m_flag; +static atomic_t a_flag; +static atomic_t mv_flag; + +static int failure_count = 0; + +static short akmd_delay = AKM8975_DEFAULT_DELAY; + +static atomic_t suspend_flag = ATOMIC_INIT(0); + +//static struct akm8975_platform_data *pdata; + +static int AKI2C_RxData(char *rxData, int length) +{ + uint8_t loop_i; + struct i2c_msg msgs[] = { + { + .addr = this_client->addr, + .flags = 0, + .len = 1, + .buf = rxData, + }, + { + .addr = this_client->addr, + .flags = I2C_M_RD, + .len = length, + .buf = rxData, + }, + }; +#if AKM8975_DEBUG_DATA + int i; + char addr = rxData[0]; +#endif +#ifdef AKM8975_DEBUG + /* Caller should check parameter validity.*/ + if ((rxData == NULL) || (length < 1)) { + return -EINVAL; + } +#endif + for (loop_i = 0; loop_i < AKM8975_RETRY_COUNT; loop_i++) { + if (i2c_transfer(this_client->adapter, msgs, 2) > 0) { + break; + } + mdelay(10); + } + + if (loop_i >= AKM8975_RETRY_COUNT) { + printk(KERN_ERR "%s retry over %d\n", __func__, AKM8975_RETRY_COUNT); + return -EIO; + } +#if AKM8975_DEBUG_DATA + printk(KERN_INFO "RxData: len=%02x, addr=%02x\n data=", length, addr); + for (i = 0; i < length; i++) { + printk(KERN_INFO " %02x", rxData[i]); + } + printk(KERN_INFO "\n"); +#endif + return 0; +} + +static int AKI2C_TxData(char *txData, int length) +{ + uint8_t loop_i; + struct i2c_msg msg[] = { + { + .addr = this_client->addr, + .flags = 0, + .len = length, + .buf = txData, + }, + }; +#if AKM8975_DEBUG_DATA + int i; +#endif +#ifdef AKM8975_DEBUG + /* Caller should check parameter validity.*/ + if ((txData == NULL) || (length < 2)) { + return -EINVAL; + } +#endif + for (loop_i = 0; loop_i < AKM8975_RETRY_COUNT; loop_i++) { + if (i2c_transfer(this_client->adapter, msg, 1) > 0) { + break; + } + mdelay(10); + } + + if (loop_i >= AKM8975_RETRY_COUNT) { + printk(KERN_ERR "%s retry over %d\n", __func__, AKM8975_RETRY_COUNT); + return -EIO; + } +#if AKM8975_DEBUG_DATA + printk(KERN_INFO "TxData: len=%02x, addr=%02x\n data=", length, txData[0]); + for (i = 0; i < (length-1); i++) { + printk(KERN_INFO " %02x", txData[i + 1]); + } + printk(KERN_INFO "\n"); +#endif + return 0; +} + +static int AKECS_SetMode_SngMeasure(void) +{ + char buffer[2]; + + atomic_set(&data_ready, 0); + + /* Set measure mode */ + buffer[0] = AK8975_REG_CNTL; + buffer[1] = AK8975_MODE_SNG_MEASURE; + + /* Set data */ + return AKI2C_TxData(buffer, 2); +} + +static int AKECS_SetMode_SelfTest(void) +{ + char buffer[2]; + + /* Set measure mode */ + buffer[0] = AK8975_REG_CNTL; + buffer[1] = AK8975_MODE_SELF_TEST; + /* Set data */ + return AKI2C_TxData(buffer, 2); +} + +static int AKECS_SetMode_FUSEAccess(void) +{ + char buffer[2]; + + /* Set measure mode */ + buffer[0] = AK8975_REG_CNTL; + buffer[1] = AK8975_MODE_FUSE_ACCESS; + /* Set data */ + return AKI2C_TxData(buffer, 2); +} + +static int AKECS_SetMode_PowerDown(void) +{ + char buffer[2]; + + /* Set powerdown mode */ + buffer[0] = AK8975_REG_CNTL; + buffer[1] = AK8975_MODE_POWERDOWN; + /* Set data */ + return AKI2C_TxData(buffer, 2); +} + +static int AKECS_SetMode(char mode) +{ + int ret; + + switch (mode) { + case AK8975_MODE_SNG_MEASURE: + ret = AKECS_SetMode_SngMeasure(); + break; + case AK8975_MODE_SELF_TEST: + ret = AKECS_SetMode_SelfTest(); + break; + case AK8975_MODE_FUSE_ACCESS: + ret = AKECS_SetMode_FUSEAccess(); + break; + case AK8975_MODE_POWERDOWN: + ret = AKECS_SetMode_PowerDown(); + /* wait at least 100us after changing mode */ + udelay(100); + break; + default: + AKMDBG("%s: Unknown mode(%d)", __func__, mode); + return -EINVAL; + } + + return ret; +} + +static int AKECS_CheckDevice(void) +{ + char buffer[2]; + int ret; + + /* Set measure mode */ + buffer[0] = AK8975_REG_WIA; + + /* Read data */ + ret = AKI2C_RxData(buffer, 1); + if (ret < 0) { + return ret; + } + /* Check read data */ + if (buffer[0] != 0x48) { + return -ENXIO; + } + + return 0; +} + +static int AKECS_GetData(char *rbuf, int size) +{ +#ifdef AKM8975_DEBUG + /* This function is not exposed, so parameters + should be checked internally.*/ + if ((rbuf == NULL) || (size < SENSOR_DATA_SIZE)) { + return -EINVAL; + } +#endif + wait_event_interruptible_timeout(data_ready_wq, + atomic_read(&data_ready), 1000); + if (!atomic_read(&data_ready)) { + AKMDBG("%s: data_ready is not set.", __func__); + if (!atomic_read(&suspend_flag)) { + AKMDBG("%s: suspend_flag is not set.", __func__); + failure_count++; + if (failure_count >= MAX_FAILURE_COUNT) { + printk(KERN_ERR + "AKM8975 AKECS_GetData: successive %d failure.\n", + failure_count); + atomic_set(&open_flag, -1); + wake_up(&open_wq); + failure_count = 0; + } + } + return -1; + } + + mutex_lock(&sense_data_mutex); + memcpy(rbuf, sense_data, size); + atomic_set(&data_ready, 0); + mutex_unlock(&sense_data_mutex); + + failure_count = 0; + return 0; +} + +static void AKECS_SetYPR(short *rbuf) +{ + struct akm8975_data *data = i2c_get_clientdata(this_client); +#if AKM8975_DEBUG_DATA + printk(KERN_INFO "AKM8975 %s:\n", __func__); + printk(KERN_INFO " yaw =%6d, pitch =%6d, roll =%6d\n", + rbuf[0], rbuf[1], rbuf[2]); + printk(KERN_INFO " tmp =%6d, m_stat =%6d, g_stat =%6d\n", + rbuf[3], rbuf[4], rbuf[5]); + printk(KERN_INFO " Acceleration[LSB]: %6d,%6d,%6d\n", + rbuf[6], rbuf[7], rbuf[8]); + printk(KERN_INFO " Geomagnetism[LSB]: %6d,%6d,%6d\n", + rbuf[9], rbuf[10], rbuf[11]); +#endif + /* Report magnetic sensor information */ + if (atomic_read(&m_flag)) { + input_report_abs(data->input_dev, ABS_RX, rbuf[0]); + input_report_abs(data->input_dev, ABS_RY, rbuf[1]); + input_report_abs(data->input_dev, ABS_RZ, rbuf[2]); + input_report_abs(data->input_dev, ABS_RUDDER, rbuf[4]); + } + + /* Report acceleration sensor information */ + if (atomic_read(&a_flag)) { + input_report_abs(data->input_dev, ABS_X, rbuf[6]); + input_report_abs(data->input_dev, ABS_Y, rbuf[7]); + input_report_abs(data->input_dev, ABS_Z, rbuf[8]); + input_report_abs(data->input_dev, ABS_WHEEL, rbuf[5]); + } + + /* Report magnetic vector information */ + if (atomic_read(&mv_flag)) { + input_report_abs(data->input_dev, ABS_HAT0X, rbuf[9]); + input_report_abs(data->input_dev, ABS_HAT0Y, rbuf[10]); + input_report_abs(data->input_dev, ABS_BRAKE, rbuf[11]); + } + + input_sync(data->input_dev); +} + +static int AKECS_GetOpenStatus(void) +{ + wait_event_interruptible(open_wq, (atomic_read(&open_flag) != 0)); + return atomic_read(&open_flag); +} + +static int AKECS_GetCloseStatus(void) +{ + wait_event_interruptible(open_wq, (atomic_read(&open_flag) <= 0)); + return atomic_read(&open_flag); +} + +static void AKECS_CloseDone(void) +{ + atomic_set(&m_flag, 1); + atomic_set(&a_flag, 1); + atomic_set(&mv_flag, 1); +} + +/***** akm_aot functions ***************************************/ +static int akm_aot_open(struct inode *inode, struct file *file) +{ + int ret = -1; + + AKMFUNC("akm_aot_open"); + if (atomic_cmpxchg(&open_count, 0, 1) == 0) { + if (atomic_cmpxchg(&open_flag, 0, 1) == 0) { + atomic_set(&reserve_open_flag, 1); + wake_up(&open_wq); + ret = 0; + } + } + return ret; +} + +static int akm_aot_release(struct inode *inode, struct file *file) +{ + AKMFUNC("akm_aot_release"); + atomic_set(&reserve_open_flag, 0); + atomic_set(&open_flag, 0); + atomic_set(&open_count, 0); + wake_up(&open_wq); + return 0; +} + +static int +akm_aot_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + void __user *argp = (void __user *)arg; + short flag; + + switch (cmd) { + case ECS_IOCTL_APP_SET_MFLAG: + case ECS_IOCTL_APP_SET_AFLAG: + case ECS_IOCTL_APP_SET_MVFLAG: + if (copy_from_user(&flag, argp, sizeof(flag))) { + return -EFAULT; + } + if (flag < 0 || flag > 1) { + return -EINVAL; + } + break; + case ECS_IOCTL_APP_SET_DELAY: + if (copy_from_user(&flag, argp, sizeof(flag))) { + return -EFAULT; + } + break; + default: + break; + } + + switch (cmd) { + case ECS_IOCTL_APP_SET_MFLAG: + atomic_set(&m_flag, flag); + AKMDBG("MFLAG is set to %d", flag); + break; + case ECS_IOCTL_APP_GET_MFLAG: + flag = atomic_read(&m_flag); + break; + case ECS_IOCTL_APP_SET_AFLAG: + atomic_set(&a_flag, flag); + AKMDBG("AFLAG is set to %d", flag); + break; + case ECS_IOCTL_APP_GET_AFLAG: + flag = atomic_read(&a_flag); + break; + case ECS_IOCTL_APP_SET_MVFLAG: + atomic_set(&mv_flag, flag); + AKMDBG("MVFLAG is set to %d", flag); + break; + case ECS_IOCTL_APP_GET_MVFLAG: + flag = atomic_read(&mv_flag); + break; + case ECS_IOCTL_APP_SET_DELAY: + akmd_delay = flag; + AKMDBG("Delay is set to %d", flag); + break; + case ECS_IOCTL_APP_GET_DELAY: + flag = akmd_delay; + break; + default: + return -ENOTTY; + } + + switch (cmd) { + case ECS_IOCTL_APP_GET_MFLAG: + case ECS_IOCTL_APP_GET_AFLAG: + case ECS_IOCTL_APP_GET_MVFLAG: + case ECS_IOCTL_APP_GET_DELAY: + if (copy_to_user(argp, &flag, sizeof(flag))) { + return -EFAULT; + } + break; + default: + break; + } + + return 0; +} + +/***** akmd functions ********************************************/ +static int akmd_open(struct inode *inode, struct file *file) +{ + AKMFUNC("akmd_open"); + return nonseekable_open(inode, file); +} + +static int akmd_release(struct inode *inode, struct file *file) +{ + AKMFUNC("akmd_release"); + AKECS_CloseDone(); + return 0; +} + +static int +akmd_ioctl(struct inode *inode, struct file *file, unsigned int cmd, + unsigned long arg) +{ + void __user *argp = (void __user *)arg; + + /* NOTE: In this function the size of "char" should be 1-byte. */ + char sData[SENSOR_DATA_SIZE];/* for GETDATA */ + char rwbuf[RWBUF_SIZE]; /* for READ/WRITE */ + char mode; /* for SET_MODE*/ + short value[12]; /* for SET_YPR */ + short delay; /* for GET_DELAY */ + int status; /* for OPEN/CLOSE_STATUS */ + int ret = -1; /* Return value. */ + /*AKMDBG("%s (0x%08X).", __func__, cmd);*/ + + switch (cmd) { + case ECS_IOCTL_WRITE: + case ECS_IOCTL_READ: + if (argp == NULL) { + AKMDBG("invalid argument."); + return -EINVAL; + } + if (copy_from_user(&rwbuf, argp, sizeof(rwbuf))) { + AKMDBG("copy_from_user failed."); + return -EFAULT; + } + break; + case ECS_IOCTL_SET_MODE: + if (argp == NULL) { + AKMDBG("invalid argument."); + return -EINVAL; + } + if (copy_from_user(&mode, argp, sizeof(mode))) { + AKMDBG("copy_from_user failed."); + return -EFAULT; + } + break; + case ECS_IOCTL_SET_YPR: + if (argp == NULL) { + AKMDBG("invalid argument."); + return -EINVAL; + } + if (copy_from_user(&value, argp, sizeof(value))) { + AKMDBG("copy_from_user failed."); + return -EFAULT; + } + break; + default: + break; + } + + switch (cmd) { + case ECS_IOCTL_WRITE: + AKMFUNC("IOCTL_WRITE"); + if ((rwbuf[0] < 2) || (rwbuf[0] > (RWBUF_SIZE-1))) { + AKMDBG("invalid argument."); + return -EINVAL; + } + ret = AKI2C_TxData(&rwbuf[1], rwbuf[0]); + if (ret < 0) { + return ret; + } + break; + case ECS_IOCTL_READ: + AKMFUNC("IOCTL_READ"); + if ((rwbuf[0] < 1) || (rwbuf[0] > (RWBUF_SIZE-1))) { + AKMDBG("invalid argument."); + return -EINVAL; + } + ret = AKI2C_RxData(&rwbuf[1], rwbuf[0]); + if (ret < 0) { + return ret; + } + break; + case ECS_IOCTL_SET_MODE: + AKMFUNC("IOCTL_SET_MODE"); + ret = AKECS_SetMode(mode); + if (ret < 0) { + return ret; + } + break; + case ECS_IOCTL_GETDATA: + AKMFUNC("IOCTL_GET_DATA"); + ret = AKECS_GetData(sData, SENSOR_DATA_SIZE); + if (ret < 0) { + return ret; + } + break; + case ECS_IOCTL_SET_YPR: + AKECS_SetYPR(value); + break; + case ECS_IOCTL_GET_OPEN_STATUS: + AKMFUNC("IOCTL_GET_OPEN_STATUS"); + status = AKECS_GetOpenStatus(); + AKMDBG("AKECS_GetOpenStatus returned (%d)", status); + break; + case ECS_IOCTL_GET_CLOSE_STATUS: + AKMFUNC("IOCTL_GET_CLOSE_STATUS"); + status = AKECS_GetCloseStatus(); + AKMDBG("AKECS_GetCloseStatus returned (%d)", status); + break; + case ECS_IOCTL_GET_DELAY: + AKMFUNC("IOCTL_GET_DELAY"); + delay = akmd_delay; + break; + default: + return -ENOTTY; + } + + switch (cmd) { + case ECS_IOCTL_READ: + if (copy_to_user(argp, &rwbuf, rwbuf[0]+1)) { + AKMDBG("copy_to_user failed."); + return -EFAULT; + } + break; + case ECS_IOCTL_GETDATA: + if (copy_to_user(argp, &sData, sizeof(sData))) { + AKMDBG("copy_to_user failed."); + return -EFAULT; + } + break; + case ECS_IOCTL_GET_OPEN_STATUS: + case ECS_IOCTL_GET_CLOSE_STATUS: + if (copy_to_user(argp, &status, sizeof(status))) { + AKMDBG("copy_to_user failed."); + return -EFAULT; + } + break; + case ECS_IOCTL_GET_DELAY: + if (copy_to_user(argp, &delay, sizeof(delay))) { + AKMDBG("copy_to_user failed."); + return -EFAULT; + } + break; + default: + break; + } + + return 0; +} + +static void akm8975_work_func(struct work_struct *work) +{ + char buffer[SENSOR_DATA_SIZE]; + int ret; + + memset(buffer, 0, SENSOR_DATA_SIZE); + buffer[0] = AK8975_REG_ST1; + ret = AKI2C_RxData(buffer, SENSOR_DATA_SIZE); + if (ret < 0) { + printk(KERN_ERR "AKM8975 akm8975_work_func: I2C failed\n"); + return; + } + /* Check ST bit */ + if ((buffer[0] & 0x01) != 0x01) { + printk(KERN_ERR "AKM8975 akm8975_work_func: ST is not set\n"); + return; + } + + mutex_lock(&sense_data_mutex); + memcpy(sense_data, buffer, SENSOR_DATA_SIZE); + atomic_set(&data_ready, 1); + wake_up(&data_ready_wq); + mutex_unlock(&sense_data_mutex); + + enable_irq(this_client->irq); + + AKMFUNC("akm8975_work_func"); +} + +static irqreturn_t akm8975_interrupt(int irq, void *dev_id) +{ + struct akm8975_data *data = dev_id; + AKMFUNC("akm8975_interrupt"); + disable_irq(this_client->irq); + schedule_work(&data->work); + return IRQ_HANDLED; +} + +static void akm8975_early_suspend(struct early_suspend *handler) +{ + AKMFUNC("akm8975_early_suspend"); + atomic_set(&suspend_flag, 1); + atomic_set(&reserve_open_flag, atomic_read(&open_flag)); + atomic_set(&open_flag, 0); + wake_up(&open_wq); + disable_irq(this_client->irq); + AKMDBG("suspended with flag=%d", + atomic_read(&reserve_open_flag)); +} + +static void akm8975_early_resume(struct early_suspend *handler) +{ + AKMFUNC("akm8975_early_resume"); + enable_irq(this_client->irq); + atomic_set(&suspend_flag, 0); + atomic_set(&open_flag, atomic_read(&reserve_open_flag)); + wake_up(&open_wq); + AKMDBG("resumed with flag=%d", + atomic_read(&reserve_open_flag)); +} + +/*********************************************/ +static struct file_operations akmd_fops = { + .owner = THIS_MODULE, + .open = akmd_open, + .release = akmd_release, + .ioctl = akmd_ioctl, +}; + +static struct file_operations akm_aot_fops = { + .owner = THIS_MODULE, + .open = akm_aot_open, + .release = akm_aot_release, + .ioctl = akm_aot_ioctl, +}; + +static struct miscdevice akmd_device = { + .minor = MISC_DYNAMIC_MINOR, + .name = "akm8975_dev", + .fops = &akmd_fops, +}; + +static struct miscdevice akm_aot_device = { + .minor = MISC_DYNAMIC_MINOR, + .name = "akm8975_aot", + .fops = &akm_aot_fops, +}; + +/*********************************************/ +int akm8975_probe(struct i2c_client *client, const struct i2c_device_id *id) +{ + struct akm8975_data *akm; + int err = 0; + + AKMFUNC("akm8975_probe"); + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { + printk(KERN_ERR "AKM8975 akm8975_probe: check_functionality failed.\n"); + err = -ENODEV; + goto exit0; + } + + /* Allocate memory for driver data */ + akm = kzalloc(sizeof(struct akm8975_data), GFP_KERNEL); + if (!akm) { + printk(KERN_ERR "AKM8975 akm8975_probe: memory allocation failed.\n"); + err = -ENOMEM; + goto exit1; + } + + INIT_WORK(&akm->work, akm8975_work_func); + i2c_set_clientdata(client, akm); + + this_client = client; + + /* Check connection */ + err = AKECS_CheckDevice(); + if (err < 0) { + printk(KERN_ERR "AKM8975 akm8975_probe: set power down mode error\n"); + goto exit3; + } + akm->eoc_irq = client->irq; + if (!akm->eoc_irq) { + dev_dbg(&akm->client->dev, "no IRQ?\n"); + return -ENODEV; + }else{ + akm->eoc_irq = gpio_to_irq(akm->eoc_irq); } - - /* Read the flux value from the appropriate register - (the register is specified in the iio device attributes). */ - status = ak8975_read_data(client, this_attr->address, 2, - (u8 *)&meas_reg); - if (!status) { - dev_err(&client->dev, "Read axis data fails\n"); - return false; - } - - /* Endian conversion of the measured values */ - raw = (s16) (le16_to_cpu(meas_reg)); - - return sprintf(buf, "%d\n", raw); -} - -static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, show_mode, store_mode, 0); -static IIO_DEVICE_ATTR(magn_x_calibscale, S_IRUGO, show_calibscale, NULL, 0); -static IIO_DEVICE_ATTR(magn_y_calibscale, S_IRUGO, show_calibscale, NULL, 1); -static IIO_DEVICE_ATTR(magn_z_calibscale, S_IRUGO, show_calibscale, NULL, 2); -static IIO_DEV_ATTR_MAGN_X(show_raw, AK8975_REG_HXL); -static IIO_DEV_ATTR_MAGN_Y(show_raw, AK8975_REG_HYL); -static IIO_DEV_ATTR_MAGN_Z(show_raw, AK8975_REG_HZL); - -static struct attribute *ak8975_attr[] = { - &iio_dev_attr_mode.dev_attr.attr, - &iio_dev_attr_magn_x_calibscale.dev_attr.attr, - &iio_dev_attr_magn_y_calibscale.dev_attr.attr, - &iio_dev_attr_magn_z_calibscale.dev_attr.attr, - &iio_dev_attr_magn_x_raw.dev_attr.attr, - &iio_dev_attr_magn_y_raw.dev_attr.attr, - &iio_dev_attr_magn_z_raw.dev_attr.attr, - NULL -}; - -static struct attribute_group ak8975_attr_group = { - .attrs = ak8975_attr, -}; - -static int ak8975_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - struct ak8975_data *data; - int err; - - /* Allocate our device context. */ - data = kzalloc(sizeof(struct ak8975_data), GFP_KERNEL); - if (!data) { - dev_err(&client->dev, "Memory allocation fails\n"); - err = -ENOMEM; - goto exit; - } - - i2c_set_clientdata(client, data); - data->client = client; - - mutex_init(&data->lock); - - /* Grab and set up the supplied GPIO. */ - data->eoc_irq = client->irq; - data->eoc_gpio = irq_to_gpio(client->irq); - - err = gpio_request(data->eoc_gpio, "ak_8975"); - if (err < 0) { - dev_err(&client->dev, "failed to request GPIO %d, error %d\n", - data->eoc_gpio, err); - goto exit_free; - } - - err = gpio_direction_input(data->eoc_gpio); + err = gpio_request(client->irq, "ak_8975"); if (err < 0) { - dev_err(&client->dev, "Failed to configure input direction for GPIO %d, error %d\n", data->eoc_gpio, err); - gpio_free(data->eoc_gpio); - goto exit_gpio; + dev_err(&client->dev, "failed to request GPIO, error %d\n", err); + goto exit3; } - - /* Perform some basic start-of-day setup of the device. */ - err = ak8975_setup(client); - if (err < 0) { - dev_err(&client->dev, "AK8975 initialization fails\n"); - goto exit_gpio; - } - - /* Register with IIO */ - data->indio_dev = iio_allocate_device(); - if (data->indio_dev == NULL) { - err = -ENOMEM; - goto exit_gpio; - } - - data->indio_dev->dev.parent = &client->dev; - data->indio_dev->attrs = &ak8975_attr_group; - data->indio_dev->dev_data = (void *)(data); - data->indio_dev->driver_module = THIS_MODULE; - data->indio_dev->modes = INDIO_DIRECT_MODE; - - err = iio_device_register(data->indio_dev); - if (err < 0) - goto exit_free_iio; - - return 0; - -exit_free_iio: - iio_free_device(data->indio_dev); -exit_gpio: - gpio_free(data->eoc_gpio); -exit_free: - kfree(data); -exit: - return err; -} - -static int ak8975_remove(struct i2c_client *client) -{ - struct ak8975_data *data = i2c_get_clientdata(client); - - iio_device_unregister(data->indio_dev); - iio_free_device(data->indio_dev); - - gpio_free(data->eoc_gpio); - - kfree(data); - - return 0; -} - -static const struct i2c_device_id ak8975_id[] = { - {"ak8975", 0}, - {} -}; - -MODULE_DEVICE_TABLE(i2c, ak8975_id); - -static struct i2c_driver ak8975_driver = { - .driver = { - .name = "ak8975", - }, - .probe = ak8975_probe, - .remove = __devexit_p(ak8975_remove), - .id_table = ak8975_id, -}; - -static int __init ak8975_init(void) -{ - return i2c_add_driver(&ak8975_driver); -} - -static void __exit ak8975_exit(void) -{ - i2c_del_driver(&ak8975_driver); -} - -module_init(ak8975_init); -module_exit(ak8975_exit); - -MODULE_AUTHOR("Laxman Dewangan "); -MODULE_DESCRIPTION("AK8975 magnetometer driver"); -MODULE_LICENSE("GPL"); + /* IRQ */ + err = request_irq(akm->eoc_irq, akm8975_interrupt, IRQ_TYPE_EDGE_RISING, + "akm8975_DRDY", akm); + if (err < 0) { + printk(KERN_ERR "AKM8975 akm8975_probe: request irq failed\n"); + goto exit4; + } + + /* Declare input device */ + akm->input_dev = input_allocate_device(); + if (!akm->input_dev) { + err = -ENOMEM; + printk(KERN_ERR + "AKM8975 akm8975_probe: Failed to allocate input device\n"); + goto exit5; + } + /* Setup input device */ + set_bit(EV_ABS, akm->input_dev->evbit); + /* yaw (0, 360) */ + input_set_abs_params(akm->input_dev, ABS_RX, 0, 23040, 0, 0); + /* pitch (-180, 180) */ + input_set_abs_params(akm->input_dev, ABS_RY, -11520, 11520, 0, 0); + /* roll (-90, 90) */ + input_set_abs_params(akm->input_dev, ABS_RZ, -5760, 5760, 0, 0); + /* x-axis acceleration (720 x 8G) */ + input_set_abs_params(akm->input_dev, ABS_X, -5760, 5760, 0, 0); + /* y-axis acceleration (720 x 8G) */ + input_set_abs_params(akm->input_dev, ABS_Y, -5760, 5760, 0, 0); + /* z-axis acceleration (720 x 8G) */ + input_set_abs_params(akm->input_dev, ABS_Z, -5760, 5760, 0, 0); + /* temparature */ + /* + input_set_abs_params(akm->input_dev, ABS_THROTTLE, -30, 85, 0, 0); + */ + /* status of magnetic sensor */ + input_set_abs_params(akm->input_dev, ABS_RUDDER, -32768, 3, 0, 0); + /* status of acceleration sensor */ + input_set_abs_params(akm->input_dev, ABS_WHEEL, -32768, 3, 0, 0); + /* x-axis of raw magnetic vector (-4096, 4095) */ + input_set_abs_params(akm->input_dev, ABS_HAT0X, -20480, 20479, 0, 0); + /* y-axis of raw magnetic vector (-4096, 4095) */ + input_set_abs_params(akm->input_dev, ABS_HAT0Y, -20480, 20479, 0, 0); + /* z-axis of raw magnetic vector (-4096, 4095) */ + input_set_abs_params(akm->input_dev, ABS_BRAKE, -20480, 20479, 0, 0); + /* Set name */ + akm->input_dev->name = "compass"; + + /* Register */ + err = input_register_device(akm->input_dev); + if (err) { + printk(KERN_ERR + "AKM8975 akm8975_probe: Unable to register input device\n"); + goto exit6; + } + + err = misc_register(&akmd_device); + if (err) { + printk(KERN_ERR + "AKM8975 akm8975_probe: akmd_device register failed\n"); + goto exit7; + } + + err = misc_register(&akm_aot_device); + if (err) { + printk(KERN_ERR + "AKM8975 akm8975_probe: akm_aot_device register failed\n"); + goto exit8; + } + + mutex_init(&sense_data_mutex); + + init_waitqueue_head(&data_ready_wq); + init_waitqueue_head(&open_wq); + + /* As default, report all information */ + atomic_set(&m_flag, 1); + atomic_set(&a_flag, 1); + atomic_set(&mv_flag, 1); + + akm->akm_early_suspend.suspend = akm8975_early_suspend; + akm->akm_early_suspend.resume = akm8975_early_resume; + register_early_suspend(&akm->akm_early_suspend); + + AKMDBG("successfully probed."); + return 0; + +exit8: + misc_deregister(&akmd_device); +exit7: + input_unregister_device(akm->input_dev); +exit6: + input_free_device(akm->input_dev); +exit5: + free_irq(client->irq, akm); +exit4: +exit3: + kfree(akm); +exit1: +exit0: + return err; + +} + +static int akm8975_remove(struct i2c_client *client) +{ + struct akm8975_data *akm = i2c_get_clientdata(client); + AKMFUNC("akm8975_remove"); + unregister_early_suspend(&akm->akm_early_suspend); + misc_deregister(&akm_aot_device); + misc_deregister(&akmd_device); + input_unregister_device(akm->input_dev); + free_irq(client->irq, akm); + kfree(akm); + AKMDBG("successfully removed."); + return 0; +} + +static const struct i2c_device_id akm8975_id[] = { + {AKM8975_I2C_NAME, 0 }, + { } +}; + +static struct i2c_driver akm8975_driver = { + .probe = akm8975_probe, + .remove = akm8975_remove, + .id_table = akm8975_id, + .driver = { + .name = AKM8975_I2C_NAME, + }, +}; + +static int __init akm8975_init(void) +{ + printk(KERN_INFO "AKM8975 compass driver: initialize\n"); + return i2c_add_driver(&akm8975_driver); +} + +static void __exit akm8975_exit(void) +{ + printk(KERN_INFO "AKM8975 compass driver: release\n"); + i2c_del_driver(&akm8975_driver); +} + +module_init(akm8975_init); +module_exit(akm8975_exit); + +MODULE_AUTHOR("viral wang "); +MODULE_DESCRIPTION("AKM8975 compass driver"); +MODULE_LICENSE("GPL"); + -- 2.34.1