mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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5a0e3ad6af
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
247 lines
5.4 KiB
C
247 lines
5.4 KiB
C
/*
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* max1111.c - +2.7V, Low-Power, Multichannel, Serial 8-bit ADCs
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*
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* Based on arch/arm/mach-pxa/corgi_ssp.c
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*
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* Copyright (C) 2004-2005 Richard Purdie
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*
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* Copyright (C) 2008 Marvell International Ltd.
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* Eric Miao <eric.miao@marvell.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* publishhed by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/spi/spi.h>
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#include <linux/slab.h>
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#define MAX1111_TX_BUF_SIZE 1
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#define MAX1111_RX_BUF_SIZE 2
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/* MAX1111 Commands */
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#define MAX1111_CTRL_PD0 (1u << 0)
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#define MAX1111_CTRL_PD1 (1u << 1)
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#define MAX1111_CTRL_SGL (1u << 2)
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#define MAX1111_CTRL_UNI (1u << 3)
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#define MAX1111_CTRL_SEL_SH (5) /* NOTE: bit 4 is ignored */
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#define MAX1111_CTRL_STR (1u << 7)
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struct max1111_data {
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struct spi_device *spi;
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struct device *hwmon_dev;
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struct spi_message msg;
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struct spi_transfer xfer[2];
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uint8_t *tx_buf;
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uint8_t *rx_buf;
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};
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static int max1111_read(struct device *dev, int channel)
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{
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struct max1111_data *data = dev_get_drvdata(dev);
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uint8_t v1, v2;
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int err;
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data->tx_buf[0] = (channel << MAX1111_CTRL_SEL_SH) |
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MAX1111_CTRL_PD0 | MAX1111_CTRL_PD1 |
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MAX1111_CTRL_SGL | MAX1111_CTRL_UNI | MAX1111_CTRL_STR;
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err = spi_sync(data->spi, &data->msg);
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if (err < 0) {
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dev_err(dev, "spi_sync failed with %d\n", err);
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return err;
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}
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v1 = data->rx_buf[0];
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v2 = data->rx_buf[1];
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if ((v1 & 0xc0) || (v2 & 0x3f))
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return -EINVAL;
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return (v1 << 2) | (v2 >> 6);
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}
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#ifdef CONFIG_SHARPSL_PM
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static struct max1111_data *the_max1111;
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int max1111_read_channel(int channel)
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{
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return max1111_read(&the_max1111->spi->dev, channel);
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}
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EXPORT_SYMBOL(max1111_read_channel);
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#endif
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/*
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* NOTE: SPI devices do not have a default 'name' attribute, which is
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* likely to be used by hwmon applications to distinguish between
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* different devices, explicitly add a name attribute here.
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*/
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static ssize_t show_name(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "max1111\n");
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}
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static ssize_t show_adc(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int channel = to_sensor_dev_attr(attr)->index;
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int ret;
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ret = max1111_read(dev, channel);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%d\n", ret);
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}
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#define MAX1111_ADC_ATTR(_id) \
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SENSOR_DEVICE_ATTR(adc##_id##_in, S_IRUGO, show_adc, NULL, _id)
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static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
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static MAX1111_ADC_ATTR(0);
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static MAX1111_ADC_ATTR(1);
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static MAX1111_ADC_ATTR(2);
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static MAX1111_ADC_ATTR(3);
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static struct attribute *max1111_attributes[] = {
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&dev_attr_name.attr,
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&sensor_dev_attr_adc0_in.dev_attr.attr,
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&sensor_dev_attr_adc1_in.dev_attr.attr,
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&sensor_dev_attr_adc2_in.dev_attr.attr,
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&sensor_dev_attr_adc3_in.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group max1111_attr_group = {
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.attrs = max1111_attributes,
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};
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static int setup_transfer(struct max1111_data *data)
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{
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struct spi_message *m;
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struct spi_transfer *x;
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data->tx_buf = kmalloc(MAX1111_TX_BUF_SIZE, GFP_KERNEL);
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if (!data->tx_buf)
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return -ENOMEM;
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data->rx_buf = kmalloc(MAX1111_RX_BUF_SIZE, GFP_KERNEL);
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if (!data->rx_buf) {
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kfree(data->tx_buf);
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return -ENOMEM;
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}
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m = &data->msg;
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x = &data->xfer[0];
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spi_message_init(m);
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x->tx_buf = &data->tx_buf[0];
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x->len = 1;
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spi_message_add_tail(x, m);
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x++;
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x->rx_buf = &data->rx_buf[0];
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x->len = 2;
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spi_message_add_tail(x, m);
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return 0;
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}
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static int __devinit max1111_probe(struct spi_device *spi)
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{
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struct max1111_data *data;
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int err;
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spi->bits_per_word = 8;
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spi->mode = SPI_MODE_0;
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err = spi_setup(spi);
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if (err < 0)
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return err;
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data = kzalloc(sizeof(struct max1111_data), GFP_KERNEL);
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if (data == NULL) {
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dev_err(&spi->dev, "failed to allocate memory\n");
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return -ENOMEM;
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}
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err = setup_transfer(data);
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if (err)
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goto err_free_data;
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data->spi = spi;
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spi_set_drvdata(spi, data);
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err = sysfs_create_group(&spi->dev.kobj, &max1111_attr_group);
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if (err) {
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dev_err(&spi->dev, "failed to create attribute group\n");
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goto err_free_all;
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}
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data->hwmon_dev = hwmon_device_register(&spi->dev);
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if (IS_ERR(data->hwmon_dev)) {
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dev_err(&spi->dev, "failed to create hwmon device\n");
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err = PTR_ERR(data->hwmon_dev);
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goto err_remove;
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}
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#ifdef CONFIG_SHARPSL_PM
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the_max1111 = data;
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#endif
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return 0;
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err_remove:
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sysfs_remove_group(&spi->dev.kobj, &max1111_attr_group);
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err_free_all:
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kfree(data->rx_buf);
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kfree(data->tx_buf);
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err_free_data:
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kfree(data);
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return err;
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}
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static int __devexit max1111_remove(struct spi_device *spi)
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{
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struct max1111_data *data = spi_get_drvdata(spi);
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hwmon_device_unregister(data->hwmon_dev);
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sysfs_remove_group(&spi->dev.kobj, &max1111_attr_group);
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kfree(data->rx_buf);
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kfree(data->tx_buf);
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kfree(data);
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return 0;
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}
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static struct spi_driver max1111_driver = {
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.driver = {
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.name = "max1111",
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.owner = THIS_MODULE,
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},
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.probe = max1111_probe,
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.remove = __devexit_p(max1111_remove),
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};
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static int __init max1111_init(void)
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{
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return spi_register_driver(&max1111_driver);
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}
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module_init(max1111_init);
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static void __exit max1111_exit(void)
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{
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spi_unregister_driver(&max1111_driver);
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}
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module_exit(max1111_exit);
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MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
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MODULE_DESCRIPTION("MAX1111 ADC Driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("spi:max1111");
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