Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755636Ab1CWKSH (ORCPT ); Wed, 23 Mar 2011 06:18:07 -0400 Received: from nwd2mail11.analog.com ([137.71.25.57]:65194 "EHLO nwd2mail11.analog.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753118Ab1CWKSE (ORCPT ); Wed, 23 Mar 2011 06:18:04 -0400 X-IronPort-AV: E=Sophos;i="4.63,230,1299474000"; d="scan'208";a="30683769" From: "Cai, Cliff" To: Jonathan Cameron CC: "linux-iio@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Drivers , "device-drivers-devel@blackfin.uclinux.org" , Cliff Cai Date: Wed, 23 Mar 2011 06:22:29 -0400 Subject: RE: [PATCH RESEND v2]IIO driver for Analog Devices Digital Output Gyroscope ADXRS450 Thread-Topic: [PATCH RESEND v2]IIO driver for Analog Devices Digital Output Gyroscope ADXRS450 Thread-Index: Acvn7uiiVPkrIiCsR/yxiW16KskFDABVO3Mg Message-ID: References: <1300526846-27183-1-git-send-email-cliff.cai@analog.com> <4D878D8B.6070902@cam.ac.uk> In-Reply-To: <4D878D8B.6070902@cam.ac.uk> Accept-Language: zh-CN, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: zh-CN, en-US Content-Type: text/plain; charset="gb2312" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by mail.home.local id p2NAIHIl011714 Content-Length: 22284 Lines: 689 >-----Original Message----- >From: Jonathan Cameron [mailto:jic23@cam.ac.uk] >Sent: 2011??3??22?? 1:40 >To: Cai, Cliff >Cc: linux-iio@vger.kernel.org; linux-kernel@vger.kernel.org; >Drivers; device-drivers-devel@blackfin.uclinux.org; Cliff Cai >Subject: Re: [PATCH RESEND v2]IIO driver for Analog Devices >Digital Output Gyroscope ADXRS450 > >On 03/19/11 09:27, cliff.cai@analog.com wrote: >> From: Cliff Cai >> >> Change v2:v1: >> >> Make modification according to Michael Hennerich's comments, correct >> the spi transfer way,use existing sysfs interfaces. >Hi Cliff, > >As you are proposing a couple of new interfaces we need to >have documentation for them. They are quad and dynamic_null_correction. >We need to first establish whether they are of general utility >and hence should be in the main abi doc. The quadrature one >isn't something I've seen before. Is it common in gyros? > >Dynamic null correction looks like it should be >gyro_z_calibbias to me but I could be wrong. The doc says " >The user can make small adjustments to the rateout of the >device by asserting these bits. This 10-bit register allows >the user to adjust the static rateout of the device by up to ??6.4??/sec. >" > >which makes me think it is an internally applied offset on the >output signal and hence calibbias in our abi. > >Other than that, various minor nitpicks inline. > >Jonathan > > >> >> Signed-off-by: Cliff Cai >> --- >> drivers/staging/iio/gyro/Kconfig | 10 + >> drivers/staging/iio/gyro/Makefile | 3 + >> drivers/staging/iio/gyro/adxrs450.h | 59 ++++ >> drivers/staging/iio/gyro/adxrs450_core.c | 471 >> ++++++++++++++++++++++++++++++ >> 4 files changed, 543 insertions(+), 0 deletions(-) create mode >> 100644 drivers/staging/iio/gyro/adxrs450.h >> create mode 100644 drivers/staging/iio/gyro/adxrs450_core.c >> >> diff --git a/drivers/staging/iio/gyro/Kconfig >> b/drivers/staging/iio/gyro/Kconfig >> index 236f15f..3432967 100644 >> --- a/drivers/staging/iio/gyro/Kconfig >> +++ b/drivers/staging/iio/gyro/Kconfig >> @@ -45,3 +45,13 @@ config ADIS16251 >> >> This driver can also be built as a module. If so, the module >> will be called adis16251. >> + >> +config ADXRS450 >> + tristate "Analog Devices ADXRS450 Digital Output >Gyroscope SPI driver" >> + depends on SPI >> + help >> + Say yes here to build support for Analog Devices >ADXRS450 programmable >> + digital output gyroscope. >> + >> + This driver can also be built as a module. If so, the module >> + will be called adxrs450. >> diff --git a/drivers/staging/iio/gyro/Makefile >> b/drivers/staging/iio/gyro/Makefile >> index 2764c15..2212240 100644 >> --- a/drivers/staging/iio/gyro/Makefile >> +++ b/drivers/staging/iio/gyro/Makefile >> @@ -17,3 +17,6 @@ obj-$(CONFIG_ADIS16260) += adis16260.o >> >> adis16251-y := adis16251_core.o >> obj-$(CONFIG_ADIS16251) += adis16251.o >> + >> +adxrs450-y := adxrs450_core.o >> +obj-$(CONFIG_ADXRS450) += adxrs450.o >> diff --git a/drivers/staging/iio/gyro/adxrs450.h >> b/drivers/staging/iio/gyro/adxrs450.h >> new file mode 100644 >> index 0000000..4633ef9 >> --- /dev/null >> +++ b/drivers/staging/iio/gyro/adxrs450.h >> @@ -0,0 +1,59 @@ >> +#ifndef SPI_ADXRS450_H_ >> +#define SPI_ADXRS450_H_ >> + >> +#define ADXRS450_STARTUP_DELAY 50 /* ms */ >> + >> +/* The MSB for the spi commands */ >> +#define ADXRS450_SENSOR_DATA 0x20 >> +#define ADXRS450_WRITE_DATA 0x40 >> +#define ADXRS450_READ_DATA 0x80 >> + >> +#define ADXRS450_RATE1 0x00 /* Rate Registers */ >> +#define ADXRS450_TEMP1 0x02 /* Temperature Registers */ >> +#define ADXRS450_LOCST1 0x04 /* Low CST Memory Registers */ >> +#define ADXRS450_HICST1 0x06 /* High CST Memory Registers */ >> +#define ADXRS450_QUAD1 0x08 /* Quad Memory Registers */ >> +#define ADXRS450_FAULT1 0x0A /* Fault Registers */ >> +#define ADXRS450_PID1 0x0C /* Part ID Register 1 */ >> +#define ADXRS450_PID0 0x0D /* Part ID Register 0 */ >> +#define ADXRS450_SNH 0x0E /* Serial Number >Registers, 4 bytes */ >> +#define ADXRS450_SNL 0x10 >> +#define ADXRS450_DNC1 0x12 /* Dynamic Null >Correction Registers */ >> +/* Check bits */ >> +#define ADXRS450_P 0x01 >> +#define ADXRS450_CHK 0x02 >> +#define ADXRS450_CST 0x04 >> +#define ADXRS450_PWR 0x08 >> +#define ADXRS450_POR 0x10 >> +#define ADXRS450_NVM 0x20 >> +#define ADXRS450_Q 0x40 >> +#define ADXRS450_PLL 0x80 >> +#define ADXRS450_UV 0x100 >> +#define ADXRS450_OV 0x200 >> +#define ADXRS450_AMP 0x400 >> +#define ADXRS450_FAIL 0x800 >> + >> +#define ADXRS450_WRERR_MASK (0x7 << 29) >> + >> +#define ADXRS450_MAX_RX 8 >> +#define ADXRS450_MAX_TX 8 >> + >> +#define ADXRS450_GET_ST(a) ((a >> 26) & 0x3) >> + >> +/** >> + * struct adxrs450_state - device instance specific data >> + * @us: actual spi_device >> + * @indio_dev: industrial I/O device structure >> + * @tx: transmit buffer >> + * @rx: recieve buffer >> + * @buf_lock: mutex to protect tx and rx >> + **/ >> +struct adxrs450_state { >> + struct spi_device *us; >> + struct iio_dev *indio_dev; >> + u8 *tx; >> + u8 *rx; >> + struct mutex buf_lock; >> +}; >> + >> +#endif /* SPI_ADXRS450_H_ */ >> diff --git a/drivers/staging/iio/gyro/adxrs450_core.c >> b/drivers/staging/iio/gyro/adxrs450_core.c >> new file mode 100644 >> index 0000000..f4f9d49 >> --- /dev/null >> +++ b/drivers/staging/iio/gyro/adxrs450_core.c >> @@ -0,0 +1,471 @@ >> +/* >> + * ADXRS450 Digital Output Gyroscope Driver >> + * >> + * Copyright 2010 Analog Devices Inc. >> + * >> + * Licensed under the GPL-2 or later. >> + */ >> + >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> + >> +#include "../iio.h" >> +#include "../sysfs.h" >> +#include "gyro.h" >> +#include "../adc/adc.h" >> + >> +#include "adxrs450.h" >> + >This is only used in one place, I'd hard code it there. >> +#define DRIVER_NAME "ADXRS450" >> + >> +/** >> + * adxrs450_spi_read_reg_16() - read 2 bytes from a register pair >> + * @dev: device associated with child of actual device (iio_dev or >> +iio_trig) >> + * @reg_address: the address of the lower of the two >registers,which >> +should be an even address, >> + * Second register's address is reg_address + 1. >> + * @val: somewhere to pass back the value read **/ static int >> +adxrs450_spi_read_reg_16(struct device *dev, >> + u8 reg_address, >> + u16 *val) >> +{ >> + struct spi_message msg; >> + struct iio_dev *indio_dev = dev_get_drvdata(dev); >> + struct adxrs450_state *st = iio_dev_get_devdata(indio_dev); >> + int ret; > The array only has one element. Please make it not be an array. >> + struct spi_transfer xfers[] = { >> + { >> + .tx_buf = st->tx, >> + .rx_buf = st->rx, >> + .bits_per_word = 8, >> + .len = 4, >> + }, >> + }; >> + /* Needs to send the command twice to get the wanted value */ >> + mutex_lock(&st->buf_lock); >> + st->tx[0] = ADXRS450_READ_DATA | reg_address >> 7; >> + st->tx[1] = reg_address << 1; >> + st->tx[2] = 0; >> + st->tx[3] = 0; >> + spi_message_init(&msg); >> + spi_message_add_tail(&xfers[0], &msg); >> + ret = spi_sync(st->us, &msg); >> + if (ret) { >> + dev_err(&st->us->dev, "problem while reading 16 >bit register 0x%02x\n", >> + reg_address); >> + goto error_ret; >> + } >> + >> + spi_message_init(&msg); >> + spi_message_add_tail(&xfers[0], &msg); >> + ret = spi_sync(st->us, &msg); >> + if (ret) { >> + dev_err(&st->us->dev, "problem while reading 16 >bit register 0x%02x\n", >> + reg_address); >> + goto error_ret; >> + } >> + >> + *val = (st->rx[1] & 0x1f) << 11 | st->rx[2] << 3 | (st->rx[3] & >> +0xe0) >> 5; >> + >> +error_ret: >> + mutex_unlock(&st->buf_lock); >> + return ret; >> +} >> + >> +/** >> + * adxrs450_spi_write_reg_16() - write 2 bytes data to a register >> +pair >> + * @dev: device associated with child of actual device (iio_dev or >> +iio_trig) >If it's an iio_trig, casting it to an iio_dev will give you >somewhat interresting results! >> + * @reg_address: the address of the lower of the two >registers,which >> +should be an even address, >> + * Second register's address is reg_address + 1. >> + * @val: value to be written. >> + **/ >> +static int adxrs450_spi_write_reg_16(struct device *dev, >> + u8 reg_address, >> + u16 *val) >> +{ >> + struct spi_message msg; >> + struct iio_dev *indio_dev = dev_get_drvdata(dev); >> + struct adxrs450_state *st = iio_dev_get_devdata(indio_dev); >> + int ret; >Again, shouldn't be an array. >> + struct spi_transfer xfers[] = { >> + { >> + .tx_buf = st->tx, >> + .rx_buf = st->rx, >> + .bits_per_word = 8, >> + .len = 4, >> + }, >> + }; >> + >> + mutex_lock(&st->buf_lock); >> + st->tx[0] = ADXRS450_WRITE_DATA | reg_address >> 7; >> + st->tx[1] = reg_address << 1 | *val >> 15; >> + st->tx[2] = *val >> 7; >> + st->tx[3] = *val << 1; >> + spi_message_init(&msg); >> + spi_message_add_tail(&xfers[0], &msg); >> + ret = spi_sync(st->us, &msg); >> + if (ret) { >> + dev_err(&st->us->dev, "problem while writing 16 >bit register 0x%02x\n", >> + reg_address); >> + goto error_ret; >only going to next line so don't need the goto and as a result >no need for the brackets either. >> + } >> + >> +error_ret: >> + mutex_unlock(&st->buf_lock); >> + return ret; >> +} >> + >> +/** >> + * adxrs450_spi_sensor_data() - read 2 bytes sensor data >> + * @dev: device associated with child of actual device (iio_dev or >> +iio_trig) >> + * @val: somewhere to pass back the value read **/ static int >> +adxrs450_spi_sensor_data(struct device *dev, u16 *val) { >> + struct spi_message msg; >> + struct iio_dev *indio_dev = dev_get_drvdata(dev); >> + struct adxrs450_state *st = iio_dev_get_devdata(indio_dev); >> + int ret; >Same array comment. >> + struct spi_transfer xfers[] = { >> + { >> + .tx_buf = st->tx, >> + .rx_buf = st->rx, >> + .bits_per_word = 8, >> + .len = 4, >> + } >> + }; >> + >> + mutex_lock(&st->buf_lock); >> + st->tx[0] = ADXRS450_SENSOR_DATA; >> + st->tx[1] = 0; >> + st->tx[2] = 0; >> + st->tx[3] = 0; >> + >> + spi_message_init(&msg); >> + spi_message_add_tail(&xfers[0], &msg); >> + ret = spi_sync(st->us, &msg); >> + if (ret) { >> + dev_err(&st->us->dev, "Problem while reading >sensor data\n"); >> + goto error_ret; >> + } >> + >> + spi_message_init(&msg); >> + spi_message_add_tail(&xfers[0], &msg); >> + ret = spi_sync(st->us, &msg); >> + if (ret) { >> + dev_err(&st->us->dev, "Problem while reading >sensor data\n"); >> + goto error_ret; >> + } >> + >> + *val = (st->rx[0] & 0x03) << 14 | st->rx[1] << 6 | (st->rx[2] & >> +0xfc) >> 2; >> +error_ret: >> + mutex_unlock(&st->buf_lock); >> + return ret; >> +} >> + > >This looks to only be called from initial setup. Might as well >just make it take an adxrs450_state directly and save the >careful indirection that is currently going on to ensure it >gets the same dev as the other write functions. >> +/** >> + * adxrs450_spi_initial() - use for initializing procedure. >> + * @dev: device associated with child of actual device (iio_dev or >> +iio_trig) >> + * @val: somewhere to pass back the value read **/ static int >> +adxrs450_spi_initial(struct device *dev, >> + u32 *val, char chk) >> +{ >> + struct spi_message msg; >> + struct iio_dev *indio_dev = dev_get_drvdata(dev); >> + struct adxrs450_state *st = iio_dev_get_devdata(indio_dev); >> + int ret; >Another unneeded array. >> + struct spi_transfer xfers[] = { >> + { >> + .tx_buf = st->tx, >> + .rx_buf = st->rx, >> + .bits_per_word = 8, >> + .len = 4, >> + }, >> + }; >> + >> + mutex_lock(&st->buf_lock); >> + st->tx[0] = ADXRS450_SENSOR_DATA; >> + st->tx[1] = 0; >> + st->tx[2] = 0; >> + st->tx[3] = 0; >> + if (chk) >> + st->tx[3] |= (ADXRS450_CHK | ADXRS450_P); >> + spi_message_init(&msg); >> + spi_message_add_tail(&xfers[0], &msg); >> + ret = spi_sync(st->us, &msg); >> + if (ret) { >> + dev_err(&st->us->dev, "Problem while reading >initializing data\n"); >> + goto error_ret; >> + } >> + >Looks like an endinaness conversion to me. be32tocpu. > >> + *val = st->rx[0] << 24 | st->rx[1] << 16 | st->rx[2] << 8 | >> +st->rx[3]; >> + >> +error_ret: >> + mutex_unlock(&st->buf_lock); >> + return ret; >> +} >> + >> +static ssize_t adxrs450_read_temp(struct device *dev, >> + struct device_attribute *attr, >> + char *buf) >> +{ >> + int ret, len = 0; >No need to initialize len. >> + u16 t; >> + ret = adxrs450_spi_read_reg_16(dev, >> + ADXRS450_TEMP1, >> + &t); >> + if (ret) >> + return ret; >> + len = sprintf(buf, "%d\n", t); >> + return len; >> +} >> + >> +static ssize_t adxrs450_read_quad(struct device *dev, >> + struct device_attribute *attr, >> + char *buf) >> +{ >> + int ret, len = 0; >Same for this len >> + u16 t; >> + ret = adxrs450_spi_read_reg_16(dev, >> + ADXRS450_QUAD1, >> + &t); >> + if (ret) >> + return ret; >> + len = sprintf(buf, "%d\n", t); >> + return len; >> +} >> + >> +static ssize_t adxrs450_write_dnc(struct device *dev, >> + struct device_attribute *attr, >> + const char *buf, >> + size_t len) >> +{ >> + int ret; >> + u16 val; >> + >> + if (len == 0 || len > 2) >> + return -EINVAL; >> + memcpy(&val, buf, len); >> + ret = adxrs450_spi_write_reg_16(dev, >> + ADXRS450_DNC1, >> + &val); >Err, so what is meant to be written to this? Looks like >you'll be dumping a random single character in to the register... >Documentation would clear this up. > >> + return ret ? ret : len; >> +} >> + >> +static ssize_t adxrs450_read_sensor_data(struct device *dev, >> + struct device_attribute *attr, >> + char *buf) >> +{ >> + int ret, len = 0; >another unneeded init of len >> + u16 t; >> + >> + ret = adxrs450_spi_sensor_data(dev, &t); >> + if (ret) >> + return ret; >> + >> + len = sprintf(buf, "%d\n", t); >> + return len; >> +} >> + >> +/* Recommended Startup Sequence by spec */ static int >> +adxrs450_initial_setup(struct adxrs450_state *st) { >> + u32 t; >> + u16 data; >> + int ret; >> + struct device *dev = &st->indio_dev->dev; >> + >> + msleep(ADXRS450_STARTUP_DELAY*2); >> + ret = adxrs450_spi_initial(dev, &t, 1); >> + if (ret) >> + return ret; >> + if (t != 0x01) { >> + dev_err(&st->us->dev, "The initial response is >not correct!\n"); >> + return -ENODEV; >> + >> + } >> + >> + msleep(ADXRS450_STARTUP_DELAY); >> + ret = adxrs450_spi_initial(dev, &t, 0); >> + if (ret) >> + return ret; >> + >> + msleep(ADXRS450_STARTUP_DELAY); >> + ret = adxrs450_spi_initial(dev, &t, 0); >> + if (ret) >> + return ret; >> + if (((t & 0xff) | 0x01) != 0xff || ADXRS450_GET_ST(t) != 2) { >> + dev_err(&st->us->dev, "The second response is >not correct!\n"); >> + return -EIO; >> + >> + } >> + ret = adxrs450_spi_initial(dev, &t, 0); >> + if (ret) >> + return ret; >> + if (((t & 0xff) | 0x01) != 0xff || ADXRS450_GET_ST(t) != 2) { >> + dev_err(&st->us->dev, "The third response is >not correct!\n"); >> + return -EIO; >> + >> + } >> + ret = adxrs450_spi_read_reg_16(dev, ADXRS450_FAULT1, &data); >> + if (ret) >> + return ret; >> + if (data & 0x0fff) { >> + dev_err(&st->us->dev, "The device is not in >normal status!\n"); >> + return -EINVAL; >> + } >> + ret = adxrs450_spi_read_reg_16(dev, ADXRS450_PID1, &data); >> + if (ret) >> + return ret; >> + dev_info(&st->us->dev, "The Part ID is 0x%x\n", data); >> + >> + ret = adxrs450_spi_read_reg_16(dev, ADXRS450_SNL, &data); >> + if (ret) >> + return ret; >> + t = data; >> + ret = adxrs450_spi_read_reg_16(dev, ADXRS450_SNH, &data); >> + if (ret) >> + return ret; >> + t |= data << 16; >> + dev_info(&st->us->dev, "The Serial Number is 0x%x\n", t); >> + >> + dev_info(&st->us->dev, "%s at CS%d\n", DRIVER_NAME, >> + st->us->chip_select); >Not really useful info to the average reader of the log. >Please clean this one out. >> + >> + return 0; >> +} >> + >I note there are two versions of this chip (from datasheet). >We should probably support changing this axis according to >which one we have. Z is out of chip plane. The other two are >arbitrary if we only have 1 axis on the chip. Currently,I don't know the way to tell what kind package the device has. So,just keep the Z-axis one. Cliff >> +static IIO_DEV_ATTR_GYRO_Z(adxrs450_read_sensor_data, 0); static >> +IIO_DEV_ATTR_TEMP_RAW(adxrs450_read_temp); >> +static IIO_DEVICE_ATTR(quad, S_IRUGO, >> + adxrs450_read_quad, NULL, 0); >> +static IIO_DEVICE_ATTR(dynamic_null_correction, S_IWUGO, >IWUSR please. People get nervous for any greater permissions than that. >> + NULL, adxrs450_write_dnc, 0); >> +static IIO_CONST_ATTR(name, "adxrs450"); >> + >> +static struct attribute *adxrs450_attributes[] = { >bonus blank line here. Please remove. >> + >> + &iio_dev_attr_gyro_z_raw.dev_attr.attr, >> + &iio_dev_attr_temp_raw.dev_attr.attr, >> + &iio_dev_attr_quad.dev_attr.attr, >> + &iio_dev_attr_dynamic_null_correction.dev_attr.attr, >> + &iio_const_attr_name.dev_attr.attr, >> + NULL >> +}; >> + >> +static const struct attribute_group adxrs450_attribute_group = { >> + .attrs = adxrs450_attributes, >> +}; >> + >> +static int __devinit adxrs450_probe(struct spi_device *spi) { >> + int ret, regdone = 0; >> + struct adxrs450_state *st = kzalloc(sizeof *st, GFP_KERNEL); >> + if (!st) { >> + ret = -ENOMEM; >> + goto error_ret; >> + } >> + /* This is only used for removal purposes */ >> + spi_set_drvdata(spi, st); >> + >> + /* Allocate the comms buffers */ >> + st->rx = kzalloc(sizeof(*st->rx)*ADXRS450_MAX_RX, GFP_KERNEL); >> + if (st->rx == NULL) { >> + ret = -ENOMEM; >> + goto error_free_st; >> + } >> + st->tx = kzalloc(sizeof(*st->tx)*ADXRS450_MAX_TX, GFP_KERNEL); >> + if (st->tx == NULL) { >> + ret = -ENOMEM; >> + goto error_free_rx; >> + } >> + st->us = spi; >> + mutex_init(&st->buf_lock); >> + /* setup the industrialio driver allocated elements */ >> + st->indio_dev = iio_allocate_device(); >> + if (st->indio_dev == NULL) { >> + ret = -ENOMEM; >> + goto error_free_tx; >> + } >> + >> + st->indio_dev->dev.parent = &spi->dev; >> + st->indio_dev->attrs = &adxrs450_attribute_group; >> + st->indio_dev->dev_data = (void *)(st); >> + st->indio_dev->driver_module = THIS_MODULE; >> + st->indio_dev->modes = INDIO_DIRECT_MODE; >> + >> + ret = iio_device_register(st->indio_dev); >> + if (ret) >> + goto error_free_dev; >> + regdone = 1; >> + >> + /* Get the device into a sane initial state */ >> + ret = adxrs450_initial_setup(st); >> + if (ret) >> + goto error_initial; >> + return 0; >> + >> +error_initial: >> +error_free_dev: >> + if (regdone) >> + iio_device_unregister(st->indio_dev); >> + else >> + iio_free_device(st->indio_dev); >> +error_free_tx: >> + kfree(st->tx); >> +error_free_rx: >> + kfree(st->rx); >> +error_free_st: >> + kfree(st); >> +error_ret: >> + return ret; >> +} >> + >> +/* fixme, confirm ordering in this function */ static int >> +adxrs450_remove(struct spi_device *spi) { >> + struct adxrs450_state *st = spi_get_drvdata(spi); > >Might as well just go with > >iio_device_unregister(st->indio_dev); >> + struct iio_dev *indio_dev = st->indio_dev; >> + >> + iio_device_unregister(indio_dev); >> + kfree(st->tx); >> + kfree(st->rx); >> + kfree(st); >> + >> + return 0; >> +} >> + >> +static struct spi_driver adxrs450_driver = { >> + .driver = { >> + .name = "adxrs450", >> + .owner = THIS_MODULE, >> + }, >> + .probe = adxrs450_probe, >> + .remove = __devexit_p(adxrs450_remove), }; >> + >> +static __init int adxrs450_init(void) { >> + return spi_register_driver(&adxrs450_driver); >> +} >> +module_init(adxrs450_init); >> + >> +static __exit void adxrs450_exit(void) { >> + spi_unregister_driver(&adxrs450_driver); >> +} >> +module_exit(adxrs450_exit); >> + >> +MODULE_AUTHOR("Cliff Cai "); >> +MODULE_DESCRIPTION("Analog Devices ADXRS450 Gyroscope SPI driver"); >> +MODULE_LICENSE("GPL v2"); > > ????{.n?+???????+%?????ݶ??w??{.n?+????{??G?????{ay?ʇڙ?,j??f???h?????????z_??(?階?ݢj"???m??????G????????????&???~???iO???z??v?^?m???? ????????I?