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kernel-fxtec-pro1x/drivers/mfd/wm8400-core.c
Phil Carmody fffba64ca3 mfd: Fix error in wm8400 reg cache access check 
Accessing num_reg elements in the interval [reg .. reg+num_regs)
is permitted if (reg+numregs <= array size), so barf when that
excluded upper bound is > array size. The prior -1 would give
access to one too many elements.

Signed-off-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2010-05-28 01:37:40 +02:00

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/*
* 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/bug.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/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 = wm8400->read_dev(wm8400->io_data, reg,
num_regs, dest);
if (ret != 0)
return ret;
for (i = 0; i < num_regs; i++)
dest[i] = be16_to_cpu(dest[i]);
return 0;
}
/* 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];
src[i] = cpu_to_be16(src[i]);
}
/* Do the actual I/O */
ret = wm8400->write_dev(wm8400->io_data, reg, num_regs, src);
if (ret != 0)
return -EIO;
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",
.driver_data = 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 = wm8400->read_dev(wm8400->io_data, WM8400_RESET_ID, 1, &reg);
if (ret != 0) {
dev_err(wm8400->dev, "Chip ID register read failed\n");
return -EIO;
}
if (be16_to_cpu(reg) != reg_data[WM8400_RESET_ID].default_val) {
dev_err(wm8400->dev, "Device is not a WM8400, ID is %x\n",
be16_to_cpu(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 = wm8400->read_dev(wm8400->io_data, 0,
ARRAY_SIZE(wm8400->reg_cache),
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, &reg);
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);
}
#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
static int wm8400_i2c_read(void *io_data, char reg, int count, u16 *dest)
{
struct i2c_client *i2c = io_data;
struct i2c_msg xfer[2];
int ret;
/* Write register */
xfer[0].addr = i2c->addr;
xfer[0].flags = 0;
xfer[0].len = 1;
xfer[0].buf = &reg;
/* Read data */
xfer[1].addr = i2c->addr;
xfer[1].flags = I2C_M_RD;
xfer[1].len = count * sizeof(u16);
xfer[1].buf = (u8 *)dest;
ret = i2c_transfer(i2c->adapter, xfer, 2);
if (ret == 2)
ret = 0;
else if (ret >= 0)
ret = -EIO;
return ret;
}
static int wm8400_i2c_write(void *io_data, char reg, int count, const u16 *src)
{
struct i2c_client *i2c = io_data;
u8 *msg;
int ret;
/* We add 1 byte for device register - ideally I2C would gather. */
msg = kmalloc((count * sizeof(u16)) + 1, GFP_KERNEL);
if (msg == NULL)
return -ENOMEM;
msg[0] = reg;
memcpy(&msg[1], src, count * sizeof(u16));
ret = i2c_master_send(i2c, msg, (count * sizeof(u16)) + 1);
if (ret == (count * 2) + 1)
ret = 0;
else if (ret >= 0)
ret = -EIO;
kfree(msg);
return ret;
}
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->io_data = i2c;
wm8400->read_dev = wm8400_i2c_read;
wm8400->write_dev = wm8400_i2c_write;
wm8400->dev = &i2c->dev;
i2c_set_clientdata(i2c, wm8400);
ret = wm8400_init(wm8400, i2c->dev.platform_data);
if (ret != 0)
goto struct_err;
return 0;
struct_err:
i2c_set_clientdata(i2c, NULL);
kfree(wm8400);
err:
return ret;
}
static int wm8400_i2c_remove(struct i2c_client *i2c)
{
struct wm8400 *wm8400 = i2c_get_clientdata(i2c);
wm8400_release(wm8400);
i2c_set_clientdata(i2c, NULL);
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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