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![Tejun Heo](/assets/img/avatar_default.png)
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>
234 lines
5.4 KiB
C
234 lines
5.4 KiB
C
/*
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* Backup battery driver for Wolfson Microelectronics wm831x PMICs
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*
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* Copyright 2009 Wolfson Microelectronics PLC.
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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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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/slab.h>
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#include <linux/mfd/wm831x/core.h>
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#include <linux/mfd/wm831x/auxadc.h>
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#include <linux/mfd/wm831x/pmu.h>
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#include <linux/mfd/wm831x/pdata.h>
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struct wm831x_backup {
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struct wm831x *wm831x;
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struct power_supply backup;
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};
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static int wm831x_backup_read_voltage(struct wm831x *wm831x,
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enum wm831x_auxadc src,
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union power_supply_propval *val)
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{
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int ret;
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ret = wm831x_auxadc_read_uv(wm831x, src);
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if (ret >= 0)
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val->intval = ret;
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return ret;
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}
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/*********************************************************************
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* Backup supply properties
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*********************************************************************/
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static void wm831x_config_backup(struct wm831x *wm831x)
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{
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struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
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struct wm831x_backup_pdata *pdata;
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int ret, reg;
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if (!wm831x_pdata || !wm831x_pdata->backup) {
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dev_warn(wm831x->dev,
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"No backup battery charger configuration\n");
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return;
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}
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pdata = wm831x_pdata->backup;
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reg = 0;
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if (pdata->charger_enable)
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reg |= WM831X_BKUP_CHG_ENA | WM831X_BKUP_BATT_DET_ENA;
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if (pdata->no_constant_voltage)
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reg |= WM831X_BKUP_CHG_MODE;
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switch (pdata->vlim) {
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case 2500:
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break;
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case 3100:
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reg |= WM831X_BKUP_CHG_VLIM;
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break;
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default:
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dev_err(wm831x->dev, "Invalid backup voltage limit %dmV\n",
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pdata->vlim);
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}
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switch (pdata->ilim) {
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case 100:
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break;
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case 200:
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reg |= 1;
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break;
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case 300:
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reg |= 2;
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break;
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case 400:
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reg |= 3;
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break;
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default:
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dev_err(wm831x->dev, "Invalid backup current limit %duA\n",
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pdata->ilim);
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}
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ret = wm831x_reg_unlock(wm831x);
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if (ret != 0) {
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dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret);
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return;
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}
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ret = wm831x_set_bits(wm831x, WM831X_BACKUP_CHARGER_CONTROL,
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WM831X_BKUP_CHG_ENA_MASK |
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WM831X_BKUP_CHG_MODE_MASK |
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WM831X_BKUP_BATT_DET_ENA_MASK |
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WM831X_BKUP_CHG_VLIM_MASK |
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WM831X_BKUP_CHG_ILIM_MASK,
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reg);
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if (ret != 0)
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dev_err(wm831x->dev,
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"Failed to set backup charger config: %d\n", ret);
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wm831x_reg_lock(wm831x);
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}
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static int wm831x_backup_get_prop(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct wm831x_backup *devdata = dev_get_drvdata(psy->dev->parent);
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struct wm831x *wm831x = devdata->wm831x;
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int ret = 0;
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ret = wm831x_reg_read(wm831x, WM831X_BACKUP_CHARGER_CONTROL);
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if (ret < 0)
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return ret;
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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if (ret & WM831X_BKUP_CHG_STS)
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val->intval = POWER_SUPPLY_STATUS_CHARGING;
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else
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val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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ret = wm831x_backup_read_voltage(wm831x, WM831X_AUX_BKUP_BATT,
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val);
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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if (ret & WM831X_BKUP_CHG_STS)
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val->intval = 1;
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else
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val->intval = 0;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static enum power_supply_property wm831x_backup_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_PRESENT,
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};
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/*********************************************************************
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* Initialisation
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*********************************************************************/
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static __devinit int wm831x_backup_probe(struct platform_device *pdev)
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{
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struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
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struct wm831x_backup *devdata;
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struct power_supply *backup;
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int ret;
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devdata = kzalloc(sizeof(struct wm831x_backup), GFP_KERNEL);
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if (devdata == NULL)
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return -ENOMEM;
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devdata->wm831x = wm831x;
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platform_set_drvdata(pdev, devdata);
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backup = &devdata->backup;
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/* We ignore configuration failures since we can still read
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* back the status without enabling the charger (which may
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* already be enabled anyway).
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*/
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wm831x_config_backup(wm831x);
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backup->name = "wm831x-backup";
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backup->type = POWER_SUPPLY_TYPE_BATTERY;
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backup->properties = wm831x_backup_props;
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backup->num_properties = ARRAY_SIZE(wm831x_backup_props);
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backup->get_property = wm831x_backup_get_prop;
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ret = power_supply_register(&pdev->dev, backup);
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if (ret)
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goto err_kmalloc;
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return ret;
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err_kmalloc:
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kfree(devdata);
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return ret;
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}
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static __devexit int wm831x_backup_remove(struct platform_device *pdev)
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{
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struct wm831x_backup *devdata = platform_get_drvdata(pdev);
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power_supply_unregister(&devdata->backup);
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kfree(devdata);
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return 0;
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}
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static struct platform_driver wm831x_backup_driver = {
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.probe = wm831x_backup_probe,
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.remove = __devexit_p(wm831x_backup_remove),
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.driver = {
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.name = "wm831x-backup",
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},
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};
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static int __init wm831x_backup_init(void)
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{
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return platform_driver_register(&wm831x_backup_driver);
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}
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module_init(wm831x_backup_init);
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static void __exit wm831x_backup_exit(void)
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{
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platform_driver_unregister(&wm831x_backup_driver);
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}
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module_exit(wm831x_backup_exit);
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MODULE_DESCRIPTION("Backup battery charger driver for WM831x PMICs");
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:wm831x-backup");
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