mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 08:58:07 +00:00
c2b5fdfba2
There is still one call of sprintf() without checking the proper buffer overflow in aat2870_dump_reg(). Replace it with scnprintf() call for covering that. Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Lee Jones <lee.jones@linaro.org>
465 lines
10 KiB
C
465 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* linux/drivers/mfd/aat2870-core.c
|
|
*
|
|
* Copyright (c) 2011, NVIDIA Corporation.
|
|
* Author: Jin Park <jinyoungp@nvidia.com>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/mfd/core.h>
|
|
#include <linux/mfd/aat2870.h>
|
|
#include <linux/regulator/machine.h>
|
|
|
|
static struct aat2870_register aat2870_regs[AAT2870_REG_NUM] = {
|
|
/* readable, writeable, value */
|
|
{ 0, 1, 0x00 }, /* 0x00 AAT2870_BL_CH_EN */
|
|
{ 0, 1, 0x16 }, /* 0x01 AAT2870_BLM */
|
|
{ 0, 1, 0x16 }, /* 0x02 AAT2870_BLS */
|
|
{ 0, 1, 0x56 }, /* 0x03 AAT2870_BL1 */
|
|
{ 0, 1, 0x56 }, /* 0x04 AAT2870_BL2 */
|
|
{ 0, 1, 0x56 }, /* 0x05 AAT2870_BL3 */
|
|
{ 0, 1, 0x56 }, /* 0x06 AAT2870_BL4 */
|
|
{ 0, 1, 0x56 }, /* 0x07 AAT2870_BL5 */
|
|
{ 0, 1, 0x56 }, /* 0x08 AAT2870_BL6 */
|
|
{ 0, 1, 0x56 }, /* 0x09 AAT2870_BL7 */
|
|
{ 0, 1, 0x56 }, /* 0x0A AAT2870_BL8 */
|
|
{ 0, 1, 0x00 }, /* 0x0B AAT2870_FLR */
|
|
{ 0, 1, 0x03 }, /* 0x0C AAT2870_FM */
|
|
{ 0, 1, 0x03 }, /* 0x0D AAT2870_FS */
|
|
{ 0, 1, 0x10 }, /* 0x0E AAT2870_ALS_CFG0 */
|
|
{ 0, 1, 0x06 }, /* 0x0F AAT2870_ALS_CFG1 */
|
|
{ 0, 1, 0x00 }, /* 0x10 AAT2870_ALS_CFG2 */
|
|
{ 1, 0, 0x00 }, /* 0x11 AAT2870_AMB */
|
|
{ 0, 1, 0x00 }, /* 0x12 AAT2870_ALS0 */
|
|
{ 0, 1, 0x00 }, /* 0x13 AAT2870_ALS1 */
|
|
{ 0, 1, 0x00 }, /* 0x14 AAT2870_ALS2 */
|
|
{ 0, 1, 0x00 }, /* 0x15 AAT2870_ALS3 */
|
|
{ 0, 1, 0x00 }, /* 0x16 AAT2870_ALS4 */
|
|
{ 0, 1, 0x00 }, /* 0x17 AAT2870_ALS5 */
|
|
{ 0, 1, 0x00 }, /* 0x18 AAT2870_ALS6 */
|
|
{ 0, 1, 0x00 }, /* 0x19 AAT2870_ALS7 */
|
|
{ 0, 1, 0x00 }, /* 0x1A AAT2870_ALS8 */
|
|
{ 0, 1, 0x00 }, /* 0x1B AAT2870_ALS9 */
|
|
{ 0, 1, 0x00 }, /* 0x1C AAT2870_ALSA */
|
|
{ 0, 1, 0x00 }, /* 0x1D AAT2870_ALSB */
|
|
{ 0, 1, 0x00 }, /* 0x1E AAT2870_ALSC */
|
|
{ 0, 1, 0x00 }, /* 0x1F AAT2870_ALSD */
|
|
{ 0, 1, 0x00 }, /* 0x20 AAT2870_ALSE */
|
|
{ 0, 1, 0x00 }, /* 0x21 AAT2870_ALSF */
|
|
{ 0, 1, 0x00 }, /* 0x22 AAT2870_SUB_SET */
|
|
{ 0, 1, 0x00 }, /* 0x23 AAT2870_SUB_CTRL */
|
|
{ 0, 1, 0x00 }, /* 0x24 AAT2870_LDO_AB */
|
|
{ 0, 1, 0x00 }, /* 0x25 AAT2870_LDO_CD */
|
|
{ 0, 1, 0x00 }, /* 0x26 AAT2870_LDO_EN */
|
|
};
|
|
|
|
static struct mfd_cell aat2870_devs[] = {
|
|
{
|
|
.name = "aat2870-backlight",
|
|
.id = AAT2870_ID_BL,
|
|
.pdata_size = sizeof(struct aat2870_bl_platform_data),
|
|
},
|
|
{
|
|
.name = "aat2870-regulator",
|
|
.id = AAT2870_ID_LDOA,
|
|
.pdata_size = sizeof(struct regulator_init_data),
|
|
},
|
|
{
|
|
.name = "aat2870-regulator",
|
|
.id = AAT2870_ID_LDOB,
|
|
.pdata_size = sizeof(struct regulator_init_data),
|
|
},
|
|
{
|
|
.name = "aat2870-regulator",
|
|
.id = AAT2870_ID_LDOC,
|
|
.pdata_size = sizeof(struct regulator_init_data),
|
|
},
|
|
{
|
|
.name = "aat2870-regulator",
|
|
.id = AAT2870_ID_LDOD,
|
|
.pdata_size = sizeof(struct regulator_init_data),
|
|
},
|
|
};
|
|
|
|
static int __aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val)
|
|
{
|
|
int ret;
|
|
|
|
if (addr >= AAT2870_REG_NUM) {
|
|
dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!aat2870->reg_cache[addr].readable) {
|
|
*val = aat2870->reg_cache[addr].value;
|
|
goto out;
|
|
}
|
|
|
|
ret = i2c_master_send(aat2870->client, &addr, 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret != 1)
|
|
return -EIO;
|
|
|
|
ret = i2c_master_recv(aat2870->client, val, 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret != 1)
|
|
return -EIO;
|
|
|
|
out:
|
|
dev_dbg(aat2870->dev, "read: addr=0x%02x, val=0x%02x\n", addr, *val);
|
|
return 0;
|
|
}
|
|
|
|
static int __aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
|
|
{
|
|
u8 msg[2];
|
|
int ret;
|
|
|
|
if (addr >= AAT2870_REG_NUM) {
|
|
dev_err(aat2870->dev, "Invalid address, 0x%02x\n", addr);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!aat2870->reg_cache[addr].writeable) {
|
|
dev_err(aat2870->dev, "Address 0x%02x is not writeable\n",
|
|
addr);
|
|
return -EINVAL;
|
|
}
|
|
|
|
msg[0] = addr;
|
|
msg[1] = val;
|
|
ret = i2c_master_send(aat2870->client, msg, 2);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret != 2)
|
|
return -EIO;
|
|
|
|
aat2870->reg_cache[addr].value = val;
|
|
|
|
dev_dbg(aat2870->dev, "write: addr=0x%02x, val=0x%02x\n", addr, val);
|
|
return 0;
|
|
}
|
|
|
|
static int aat2870_read(struct aat2870_data *aat2870, u8 addr, u8 *val)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&aat2870->io_lock);
|
|
ret = __aat2870_read(aat2870, addr, val);
|
|
mutex_unlock(&aat2870->io_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int aat2870_write(struct aat2870_data *aat2870, u8 addr, u8 val)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&aat2870->io_lock);
|
|
ret = __aat2870_write(aat2870, addr, val);
|
|
mutex_unlock(&aat2870->io_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int aat2870_update(struct aat2870_data *aat2870, u8 addr, u8 mask,
|
|
u8 val)
|
|
{
|
|
int change;
|
|
u8 old_val, new_val;
|
|
int ret;
|
|
|
|
mutex_lock(&aat2870->io_lock);
|
|
|
|
ret = __aat2870_read(aat2870, addr, &old_val);
|
|
if (ret)
|
|
goto out_unlock;
|
|
|
|
new_val = (old_val & ~mask) | (val & mask);
|
|
change = old_val != new_val;
|
|
if (change)
|
|
ret = __aat2870_write(aat2870, addr, new_val);
|
|
|
|
out_unlock:
|
|
mutex_unlock(&aat2870->io_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline void aat2870_enable(struct aat2870_data *aat2870)
|
|
{
|
|
if (aat2870->en_pin >= 0)
|
|
gpio_set_value(aat2870->en_pin, 1);
|
|
|
|
aat2870->is_enable = 1;
|
|
}
|
|
|
|
static inline void aat2870_disable(struct aat2870_data *aat2870)
|
|
{
|
|
if (aat2870->en_pin >= 0)
|
|
gpio_set_value(aat2870->en_pin, 0);
|
|
|
|
aat2870->is_enable = 0;
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
static ssize_t aat2870_dump_reg(struct aat2870_data *aat2870, char *buf)
|
|
{
|
|
u8 addr, val;
|
|
ssize_t count = 0;
|
|
int ret;
|
|
|
|
count += sprintf(buf, "aat2870 registers\n");
|
|
for (addr = 0; addr < AAT2870_REG_NUM; addr++) {
|
|
count += snprintf(buf + count, PAGE_SIZE - count, "0x%02x: ", addr);
|
|
if (count >= PAGE_SIZE - 1)
|
|
break;
|
|
|
|
ret = aat2870->read(aat2870, addr, &val);
|
|
if (ret == 0)
|
|
count += snprintf(buf + count, PAGE_SIZE - count,
|
|
"0x%02x", val);
|
|
else
|
|
count += snprintf(buf + count, PAGE_SIZE - count,
|
|
"<read fail: %d>", ret);
|
|
|
|
if (count >= PAGE_SIZE - 1)
|
|
break;
|
|
|
|
count += snprintf(buf + count, PAGE_SIZE - count, "\n");
|
|
if (count >= PAGE_SIZE - 1)
|
|
break;
|
|
}
|
|
|
|
/* Truncate count; min() would cause a warning */
|
|
if (count >= PAGE_SIZE)
|
|
count = PAGE_SIZE - 1;
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t aat2870_reg_read_file(struct file *file, char __user *user_buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct aat2870_data *aat2870 = file->private_data;
|
|
char *buf;
|
|
ssize_t ret;
|
|
|
|
buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
ret = aat2870_dump_reg(aat2870, buf);
|
|
if (ret >= 0)
|
|
ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
|
|
|
|
kfree(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t aat2870_reg_write_file(struct file *file,
|
|
const char __user *user_buf, size_t count,
|
|
loff_t *ppos)
|
|
{
|
|
struct aat2870_data *aat2870 = file->private_data;
|
|
char buf[32];
|
|
ssize_t buf_size;
|
|
char *start = buf;
|
|
unsigned long addr, val;
|
|
int ret;
|
|
|
|
buf_size = min(count, (size_t)(sizeof(buf)-1));
|
|
if (copy_from_user(buf, user_buf, buf_size)) {
|
|
dev_err(aat2870->dev, "Failed to copy from user\n");
|
|
return -EFAULT;
|
|
}
|
|
buf[buf_size] = 0;
|
|
|
|
while (*start == ' ')
|
|
start++;
|
|
|
|
ret = kstrtoul(start, 16, &addr);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (addr >= AAT2870_REG_NUM) {
|
|
dev_err(aat2870->dev, "Invalid address, 0x%lx\n", addr);
|
|
return -EINVAL;
|
|
}
|
|
|
|
while (*start == ' ')
|
|
start++;
|
|
|
|
ret = kstrtoul(start, 16, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = aat2870->write(aat2870, (u8)addr, (u8)val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
static const struct file_operations aat2870_reg_fops = {
|
|
.open = simple_open,
|
|
.read = aat2870_reg_read_file,
|
|
.write = aat2870_reg_write_file,
|
|
};
|
|
|
|
static void aat2870_init_debugfs(struct aat2870_data *aat2870)
|
|
{
|
|
aat2870->dentry_root = debugfs_create_dir("aat2870", NULL);
|
|
|
|
debugfs_create_file("regs", 0644, aat2870->dentry_root, aat2870,
|
|
&aat2870_reg_fops);
|
|
}
|
|
|
|
#else
|
|
static inline void aat2870_init_debugfs(struct aat2870_data *aat2870)
|
|
{
|
|
}
|
|
#endif /* CONFIG_DEBUG_FS */
|
|
|
|
static int aat2870_i2c_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct aat2870_platform_data *pdata = dev_get_platdata(&client->dev);
|
|
struct aat2870_data *aat2870;
|
|
int i, j;
|
|
int ret = 0;
|
|
|
|
aat2870 = devm_kzalloc(&client->dev, sizeof(struct aat2870_data),
|
|
GFP_KERNEL);
|
|
if (!aat2870)
|
|
return -ENOMEM;
|
|
|
|
aat2870->dev = &client->dev;
|
|
dev_set_drvdata(aat2870->dev, aat2870);
|
|
|
|
aat2870->client = client;
|
|
i2c_set_clientdata(client, aat2870);
|
|
|
|
aat2870->reg_cache = aat2870_regs;
|
|
|
|
if (pdata->en_pin < 0)
|
|
aat2870->en_pin = -1;
|
|
else
|
|
aat2870->en_pin = pdata->en_pin;
|
|
|
|
aat2870->init = pdata->init;
|
|
aat2870->uninit = pdata->uninit;
|
|
aat2870->read = aat2870_read;
|
|
aat2870->write = aat2870_write;
|
|
aat2870->update = aat2870_update;
|
|
|
|
mutex_init(&aat2870->io_lock);
|
|
|
|
if (aat2870->init)
|
|
aat2870->init(aat2870);
|
|
|
|
if (aat2870->en_pin >= 0) {
|
|
ret = devm_gpio_request_one(&client->dev, aat2870->en_pin,
|
|
GPIOF_OUT_INIT_HIGH, "aat2870-en");
|
|
if (ret < 0) {
|
|
dev_err(&client->dev,
|
|
"Failed to request GPIO %d\n", aat2870->en_pin);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
aat2870_enable(aat2870);
|
|
|
|
for (i = 0; i < pdata->num_subdevs; i++) {
|
|
for (j = 0; j < ARRAY_SIZE(aat2870_devs); j++) {
|
|
if ((pdata->subdevs[i].id == aat2870_devs[j].id) &&
|
|
!strcmp(pdata->subdevs[i].name,
|
|
aat2870_devs[j].name)) {
|
|
aat2870_devs[j].platform_data =
|
|
pdata->subdevs[i].platform_data;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
ret = mfd_add_devices(aat2870->dev, 0, aat2870_devs,
|
|
ARRAY_SIZE(aat2870_devs), NULL, 0, NULL);
|
|
if (ret != 0) {
|
|
dev_err(aat2870->dev, "Failed to add subdev: %d\n", ret);
|
|
goto out_disable;
|
|
}
|
|
|
|
aat2870_init_debugfs(aat2870);
|
|
|
|
return 0;
|
|
|
|
out_disable:
|
|
aat2870_disable(aat2870);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int aat2870_i2c_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct aat2870_data *aat2870 = i2c_get_clientdata(client);
|
|
|
|
aat2870_disable(aat2870);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int aat2870_i2c_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct aat2870_data *aat2870 = i2c_get_clientdata(client);
|
|
struct aat2870_register *reg = NULL;
|
|
int i;
|
|
|
|
aat2870_enable(aat2870);
|
|
|
|
/* restore registers */
|
|
for (i = 0; i < AAT2870_REG_NUM; i++) {
|
|
reg = &aat2870->reg_cache[i];
|
|
if (reg->writeable)
|
|
aat2870->write(aat2870, i, reg->value);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
static SIMPLE_DEV_PM_OPS(aat2870_pm_ops, aat2870_i2c_suspend,
|
|
aat2870_i2c_resume);
|
|
|
|
static const struct i2c_device_id aat2870_i2c_id_table[] = {
|
|
{ "aat2870", 0 },
|
|
{ }
|
|
};
|
|
|
|
static struct i2c_driver aat2870_i2c_driver = {
|
|
.driver = {
|
|
.name = "aat2870",
|
|
.pm = &aat2870_pm_ops,
|
|
.suppress_bind_attrs = true,
|
|
},
|
|
.probe = aat2870_i2c_probe,
|
|
.id_table = aat2870_i2c_id_table,
|
|
};
|
|
|
|
static int __init aat2870_init(void)
|
|
{
|
|
return i2c_add_driver(&aat2870_i2c_driver);
|
|
}
|
|
subsys_initcall(aat2870_init);
|