Revision 016e8d44bc06dd3322f26712bdd3f3a6973592d0 authored by Josh Boyer on 19 August 2011, 18:50:26 UTC, committed by Al Viro on 19 November 2011, 16:13:26 UTC
Newer versions of MINIX can create filesystems that allocate an extra bitmap block. Mounting of this succeeds, but doing a statfs call will result in an oops in count_free because of a negative number being used for the bh index. Avoid this by verifying the number of allocated blocks at mount time, erroring out if there are not enough and make statfs ignore the extras if there are too many. This fixes https://bugzilla.kernel.org/show_bug.cgi?id=18792 Signed-off-by: Josh Boyer <jwboyer@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
1 parent d633180
wm8400-core.c
/*
* Core driver for WM8400.
*
* Copyright 2008 Wolfson Microelectronics PLC.
*
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
*
* 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.
*
*/
#include <linux/module.h>
#include <linux/bug.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/mfd/core.h>
#include <linux/mfd/wm8400-private.h>
#include <linux/mfd/wm8400-audio.h>
#include <linux/regmap.h>
#include <linux/slab.h>
static struct {
u16 readable; /* Mask of readable bits */
u16 writable; /* Mask of writable bits */
u16 vol; /* Mask of volatile bits */
int is_codec; /* Register controlled by codec reset */
u16 default_val; /* Value on reset */
} reg_data[] = {
{ 0xFFFF, 0xFFFF, 0x0000, 0, 0x6172 }, /* R0 */
{ 0x7000, 0x0000, 0x8000, 0, 0x0000 }, /* R1 */
{ 0xFF17, 0xFF17, 0x0000, 0, 0x0000 }, /* R2 */
{ 0xEBF3, 0xEBF3, 0x0000, 1, 0x6000 }, /* R3 */
{ 0x3CF3, 0x3CF3, 0x0000, 1, 0x0000 }, /* R4 */
{ 0xF1F8, 0xF1F8, 0x0000, 1, 0x4050 }, /* R5 */
{ 0xFC1F, 0xFC1F, 0x0000, 1, 0x4000 }, /* R6 */
{ 0xDFDE, 0xDFDE, 0x0000, 1, 0x01C8 }, /* R7 */
{ 0xFCFC, 0xFCFC, 0x0000, 1, 0x0000 }, /* R8 */
{ 0xEFFF, 0xEFFF, 0x0000, 1, 0x0040 }, /* R9 */
{ 0xEFFF, 0xEFFF, 0x0000, 1, 0x0040 }, /* R10 */
{ 0x27F7, 0x27F7, 0x0000, 1, 0x0004 }, /* R11 */
{ 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R12 */
{ 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R13 */
{ 0x1FEF, 0x1FEF, 0x0000, 1, 0x0000 }, /* R14 */
{ 0x0163, 0x0163, 0x0000, 1, 0x0100 }, /* R15 */
{ 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R16 */
{ 0x01FF, 0x01FF, 0x0000, 1, 0x00C0 }, /* R17 */
{ 0x1FFF, 0x0FFF, 0x0000, 1, 0x0000 }, /* R18 */
{ 0xFFFF, 0xFFFF, 0x0000, 1, 0x1000 }, /* R19 */
{ 0xFFFF, 0xFFFF, 0x0000, 1, 0x1010 }, /* R20 */
{ 0xFFFF, 0xFFFF, 0x0000, 1, 0x1010 }, /* R21 */
{ 0x0FDD, 0x0FDD, 0x0000, 1, 0x8000 }, /* R22 */
{ 0x1FFF, 0x1FFF, 0x0000, 1, 0x0800 }, /* R23 */
{ 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R24 */
{ 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R25 */
{ 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R26 */
{ 0x0000, 0x01DF, 0x0000, 1, 0x008B }, /* R27 */
{ 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R28 */
{ 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R29 */
{ 0x0000, 0x0077, 0x0000, 1, 0x0066 }, /* R30 */
{ 0x0000, 0x0033, 0x0000, 1, 0x0022 }, /* R31 */
{ 0x0000, 0x01FF, 0x0000, 1, 0x0079 }, /* R32 */
{ 0x0000, 0x01FF, 0x0000, 1, 0x0079 }, /* R33 */
{ 0x0000, 0x0003, 0x0000, 1, 0x0003 }, /* R34 */
{ 0x0000, 0x01FF, 0x0000, 1, 0x0003 }, /* R35 */
{ 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R36 */
{ 0x0000, 0x003F, 0x0000, 1, 0x0100 }, /* R37 */
{ 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R38 */
{ 0x0000, 0x000F, 0x0000, 0, 0x0000 }, /* R39 */
{ 0x0000, 0x00FF, 0x0000, 1, 0x0000 }, /* R40 */
{ 0x0000, 0x01B7, 0x0000, 1, 0x0000 }, /* R41 */
{ 0x0000, 0x01B7, 0x0000, 1, 0x0000 }, /* R42 */
{ 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R43 */
{ 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R44 */
{ 0x0000, 0x00FD, 0x0000, 1, 0x0000 }, /* R45 */
{ 0x0000, 0x00FD, 0x0000, 1, 0x0000 }, /* R46 */
{ 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R47 */
{ 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R48 */
{ 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R49 */
{ 0x0000, 0x01FF, 0x0000, 1, 0x0000 }, /* R50 */
{ 0x0000, 0x01B3, 0x0000, 1, 0x0180 }, /* R51 */
{ 0x0000, 0x0077, 0x0000, 1, 0x0000 }, /* R52 */
{ 0x0000, 0x0077, 0x0000, 1, 0x0000 }, /* R53 */
{ 0x0000, 0x00FF, 0x0000, 1, 0x0000 }, /* R54 */
{ 0x0000, 0x0001, 0x0000, 1, 0x0000 }, /* R55 */
{ 0x0000, 0x003F, 0x0000, 1, 0x0000 }, /* R56 */
{ 0x0000, 0x004F, 0x0000, 1, 0x0000 }, /* R57 */
{ 0x0000, 0x00FD, 0x0000, 1, 0x0000 }, /* R58 */
{ 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R59 */
{ 0x1FFF, 0x1FFF, 0x0000, 1, 0x0000 }, /* R60 */
{ 0xFFFF, 0xFFFF, 0x0000, 1, 0x0000 }, /* R61 */
{ 0x03FF, 0x03FF, 0x0000, 1, 0x0000 }, /* R62 */
{ 0x007F, 0x007F, 0x0000, 1, 0x0000 }, /* R63 */
{ 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R64 */
{ 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R65 */
{ 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R66 */
{ 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R67 */
{ 0xDFFF, 0xDFFF, 0x0000, 0, 0x0000 }, /* R68 */
{ 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R69 */
{ 0xFFFF, 0xFFFF, 0x0000, 0, 0x4400 }, /* R70 */
{ 0x23FF, 0x23FF, 0x0000, 0, 0x0000 }, /* R71 */
{ 0xFFFF, 0xFFFF, 0x0000, 0, 0x4400 }, /* R72 */
{ 0x23FF, 0x23FF, 0x0000, 0, 0x0000 }, /* R73 */
{ 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R74 */
{ 0x000E, 0x000E, 0x0000, 0, 0x0008 }, /* R75 */
{ 0xE00F, 0xE00F, 0x0000, 0, 0x0000 }, /* R76 */
{ 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R77 */
{ 0x03C0, 0x03C0, 0x0000, 0, 0x02C0 }, /* R78 */
{ 0xFFFF, 0x0000, 0xffff, 0, 0x0000 }, /* R79 */
{ 0xFFFF, 0xFFFF, 0x0000, 0, 0x0000 }, /* R80 */
{ 0xFFFF, 0x0000, 0xffff, 0, 0x0000 }, /* R81 */
{ 0x2BFF, 0x0000, 0xffff, 0, 0x0000 }, /* R82 */
{ 0x0000, 0x0000, 0x0000, 0, 0x0000 }, /* R83 */
{ 0x80FF, 0x80FF, 0x0000, 0, 0x00ff }, /* R84 */
};
static int wm8400_read(struct wm8400 *wm8400, u8 reg, int num_regs, u16 *dest)
{
int i, ret = 0;
BUG_ON(reg + num_regs > ARRAY_SIZE(wm8400->reg_cache));
/* If there are any volatile reads then read back the entire block */
for (i = reg; i < reg + num_regs; i++)
if (reg_data[i].vol) {
ret = regmap_bulk_read(wm8400->regmap, reg, dest,
num_regs);
return ret;
}
/* Otherwise use the cache */
memcpy(dest, &wm8400->reg_cache[reg], num_regs * sizeof(u16));
return 0;
}
static int wm8400_write(struct wm8400 *wm8400, u8 reg, int num_regs,
u16 *src)
{
int ret, i;
BUG_ON(reg + num_regs > ARRAY_SIZE(wm8400->reg_cache));
for (i = 0; i < num_regs; i++) {
BUG_ON(!reg_data[reg + i].writable);
wm8400->reg_cache[reg + i] = src[i];
ret = regmap_write(wm8400->regmap, reg, src[i]);
if (ret != 0)
return ret;
}
return 0;
}
/**
* wm8400_reg_read - Single register read
*
* @wm8400: Pointer to wm8400 control structure
* @reg: Register to read
*
* @return Read value
*/
u16 wm8400_reg_read(struct wm8400 *wm8400, u8 reg)
{
u16 val;
mutex_lock(&wm8400->io_lock);
wm8400_read(wm8400, reg, 1, &val);
mutex_unlock(&wm8400->io_lock);
return val;
}
EXPORT_SYMBOL_GPL(wm8400_reg_read);
int wm8400_block_read(struct wm8400 *wm8400, u8 reg, int count, u16 *data)
{
int ret;
mutex_lock(&wm8400->io_lock);
ret = wm8400_read(wm8400, reg, count, data);
mutex_unlock(&wm8400->io_lock);
return ret;
}
EXPORT_SYMBOL_GPL(wm8400_block_read);
/**
* wm8400_set_bits - Bitmask write
*
* @wm8400: Pointer to wm8400 control structure
* @reg: Register to access
* @mask: Mask of bits to change
* @val: Value to set for masked bits
*/
int wm8400_set_bits(struct wm8400 *wm8400, u8 reg, u16 mask, u16 val)
{
u16 tmp;
int ret;
mutex_lock(&wm8400->io_lock);
ret = wm8400_read(wm8400, reg, 1, &tmp);
tmp = (tmp & ~mask) | val;
if (ret == 0)
ret = wm8400_write(wm8400, reg, 1, &tmp);
mutex_unlock(&wm8400->io_lock);
return ret;
}
EXPORT_SYMBOL_GPL(wm8400_set_bits);
/**
* wm8400_reset_codec_reg_cache - Reset cached codec registers to
* their default values.
*/
void wm8400_reset_codec_reg_cache(struct wm8400 *wm8400)
{
int i;
mutex_lock(&wm8400->io_lock);
/* Reset all codec registers to their initial value */
for (i = 0; i < ARRAY_SIZE(wm8400->reg_cache); i++)
if (reg_data[i].is_codec)
wm8400->reg_cache[i] = reg_data[i].default_val;
mutex_unlock(&wm8400->io_lock);
}
EXPORT_SYMBOL_GPL(wm8400_reset_codec_reg_cache);
static int wm8400_register_codec(struct wm8400 *wm8400)
{
struct mfd_cell cell = {
.name = "wm8400-codec",
.platform_data = wm8400,
.pdata_size = sizeof(*wm8400),
};
return mfd_add_devices(wm8400->dev, -1, &cell, 1, NULL, 0);
}
/*
* wm8400_init - Generic initialisation
*
* The WM8400 can be configured as either an I2C or SPI device. Probe
* functions for each bus set up the accessors then call into this to
* set up the device itself.
*/
static int wm8400_init(struct wm8400 *wm8400,
struct wm8400_platform_data *pdata)
{
u16 reg;
int ret, i;
mutex_init(&wm8400->io_lock);
dev_set_drvdata(wm8400->dev, wm8400);
/* Check that this is actually a WM8400 */
ret = regmap_read(wm8400->regmap, WM8400_RESET_ID, &i);
if (ret != 0) {
dev_err(wm8400->dev, "Chip ID register read failed\n");
return -EIO;
}
if (i != reg_data[WM8400_RESET_ID].default_val) {
dev_err(wm8400->dev, "Device is not a WM8400, ID is %x\n",
reg);
return -ENODEV;
}
/* We don't know what state the hardware is in and since this
* is a PMIC we can't reset it safely so initialise the register
* cache from the hardware.
*/
ret = regmap_raw_read(wm8400->regmap, 0, wm8400->reg_cache,
ARRAY_SIZE(wm8400->reg_cache));
if (ret != 0) {
dev_err(wm8400->dev, "Register cache read failed\n");
return -EIO;
}
for (i = 0; i < ARRAY_SIZE(wm8400->reg_cache); i++)
wm8400->reg_cache[i] = be16_to_cpu(wm8400->reg_cache[i]);
/* If the codec is in reset use hard coded values */
if (!(wm8400->reg_cache[WM8400_POWER_MANAGEMENT_1] & WM8400_CODEC_ENA))
for (i = 0; i < ARRAY_SIZE(wm8400->reg_cache); i++)
if (reg_data[i].is_codec)
wm8400->reg_cache[i] = reg_data[i].default_val;
ret = wm8400_read(wm8400, WM8400_ID, 1, ®);
if (ret != 0) {
dev_err(wm8400->dev, "ID register read failed: %d\n", ret);
return ret;
}
reg = (reg & WM8400_CHIP_REV_MASK) >> WM8400_CHIP_REV_SHIFT;
dev_info(wm8400->dev, "WM8400 revision %x\n", reg);
ret = wm8400_register_codec(wm8400);
if (ret != 0) {
dev_err(wm8400->dev, "Failed to register codec\n");
goto err_children;
}
if (pdata && pdata->platform_init) {
ret = pdata->platform_init(wm8400->dev);
if (ret != 0) {
dev_err(wm8400->dev, "Platform init failed: %d\n",
ret);
goto err_children;
}
} else
dev_warn(wm8400->dev, "No platform initialisation supplied\n");
return 0;
err_children:
mfd_remove_devices(wm8400->dev);
return ret;
}
static void wm8400_release(struct wm8400 *wm8400)
{
mfd_remove_devices(wm8400->dev);
}
static const struct regmap_config wm8400_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
.max_register = WM8400_REGISTER_COUNT - 1,
};
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
static int wm8400_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct wm8400 *wm8400;
int ret;
wm8400 = kzalloc(sizeof(struct wm8400), GFP_KERNEL);
if (wm8400 == NULL) {
ret = -ENOMEM;
goto err;
}
wm8400->regmap = regmap_init_i2c(i2c, &wm8400_regmap_config);
if (IS_ERR(wm8400->regmap)) {
ret = PTR_ERR(wm8400->regmap);
goto struct_err;
}
wm8400->dev = &i2c->dev;
i2c_set_clientdata(i2c, wm8400);
ret = wm8400_init(wm8400, i2c->dev.platform_data);
if (ret != 0)
goto map_err;
return 0;
map_err:
regmap_exit(wm8400->regmap);
struct_err:
kfree(wm8400);
err:
return ret;
}
static int wm8400_i2c_remove(struct i2c_client *i2c)
{
struct wm8400 *wm8400 = i2c_get_clientdata(i2c);
wm8400_release(wm8400);
regmap_exit(wm8400->regmap);
kfree(wm8400);
return 0;
}
static const struct i2c_device_id wm8400_i2c_id[] = {
{ "wm8400", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, wm8400_i2c_id);
static struct i2c_driver wm8400_i2c_driver = {
.driver = {
.name = "WM8400",
.owner = THIS_MODULE,
},
.probe = wm8400_i2c_probe,
.remove = wm8400_i2c_remove,
.id_table = wm8400_i2c_id,
};
#endif
static int __init wm8400_module_init(void)
{
int ret = -ENODEV;
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
ret = i2c_add_driver(&wm8400_i2c_driver);
if (ret != 0)
pr_err("Failed to register I2C driver: %d\n", ret);
#endif
return ret;
}
subsys_initcall(wm8400_module_init);
static void __exit wm8400_module_exit(void)
{
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
i2c_del_driver(&wm8400_i2c_driver);
#endif
}
module_exit(wm8400_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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