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alistair23-linux/drivers/mfd/aat2870-core.c
Mark Brown 0848c94fb4 mfd: core: Push irqdomain mapping out into devices 
Currently the MFD core supports remapping MFD cell interrupts using an
irqdomain but only if the MFD is being instantiated using device tree
and only if the device tree bindings use the pattern of registering IPs
in the device tree with compatible properties.  This will be actively
harmful for drivers which support non-DT platforms and use this pattern
for their DT bindings as it will mean that the core will silently change
remapping behaviour and it is also limiting for drivers which don't do
DT with this particular pattern.  There is also a potential fragility if
there are interrupts not associated with MFD cells and all the cells are
omitted from the device tree for some reason.

Instead change the code to take an IRQ domain as an optional argument,
allowing drivers to take the decision about the parent domain for their
interrupts.  The one current user of this feature is ab8500-core, it has
the domain lookup pushed out into the driver.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2012-09-15 23:22:04 +02:00

530 lines
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/*
* linux/drivers/mfd/aat2870-core.c
*
* Copyright (c) 2011, NVIDIA Corporation.
* Author: Jin Park <jinyoungp@nvidia.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <linux/kernel.h>
#include <linux/module.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 += sprintf(buf + 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, (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++;
addr = simple_strtoul(start, &start, 16);
if (addr >= AAT2870_REG_NUM) {
dev_err(aat2870->dev, "Invalid address, 0x%lx\n", addr);
return -EINVAL;
}
while (*start == ' ')
start++;
if (strict_strtoul(start, 16, &val))
return -EINVAL;
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);
if (!aat2870->dentry_root) {
dev_warn(aat2870->dev,
"Failed to create debugfs root directory\n");
return;
}
aat2870->dentry_reg = debugfs_create_file("regs", 0644,
aat2870->dentry_root,
aat2870, &aat2870_reg_fops);
if (!aat2870->dentry_reg)
dev_warn(aat2870->dev,
"Failed to create debugfs register file\n");
}
static void aat2870_uninit_debugfs(struct aat2870_data *aat2870)
{
debugfs_remove_recursive(aat2870->dentry_root);
}
#else
static inline void aat2870_init_debugfs(struct aat2870_data *aat2870)
{
}
static inline void aat2870_uninit_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 = client->dev.platform_data;
struct aat2870_data *aat2870;
int i, j;
int ret = 0;
aat2870 = kzalloc(sizeof(struct aat2870_data), GFP_KERNEL);
if (!aat2870) {
dev_err(&client->dev,
"Failed to allocate memory for aat2870\n");
ret = -ENOMEM;
goto out;
}
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 = gpio_request_one(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);
goto out_kfree;
}
}
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);
if (aat2870->en_pin >= 0)
gpio_free(aat2870->en_pin);
out_kfree:
kfree(aat2870);
out:
return ret;
}
static int aat2870_i2c_remove(struct i2c_client *client)
{
struct aat2870_data *aat2870 = i2c_get_clientdata(client);
aat2870_uninit_debugfs(aat2870);
mfd_remove_devices(aat2870->dev);
aat2870_disable(aat2870);
if (aat2870->en_pin >= 0)
gpio_free(aat2870->en_pin);
if (aat2870->uninit)
aat2870->uninit(aat2870);
kfree(aat2870);
return 0;
}
#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 },
{ }
};
MODULE_DEVICE_TABLE(i2c, aat2870_i2c_id_table);
static struct i2c_driver aat2870_i2c_driver = {
.driver = {
.name = "aat2870",
.owner = THIS_MODULE,
.pm = &aat2870_pm_ops,
},
.probe = aat2870_i2c_probe,
.remove = aat2870_i2c_remove,
.id_table = aat2870_i2c_id_table,
};
static int __init aat2870_init(void)
{
return i2c_add_driver(&aat2870_i2c_driver);
}
subsys_initcall(aat2870_init);
static void __exit aat2870_exit(void)
{
i2c_del_driver(&aat2870_i2c_driver);
}
module_exit(aat2870_exit);
MODULE_DESCRIPTION("Core support for the AnalogicTech AAT2870");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
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