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linux/drivers/mfd/tps6586x.c

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/*
* Core driver for TI TPS6586x PMIC family
*
* Copyright (c) 2010 CompuLab Ltd.
* Mike Rapoport <mike@compulab.co.il>
*
* Based on da903x.c.
* Copyright (C) 2008 Compulab, Ltd.
* Mike Rapoport <mike@compulab.co.il>
* Copyright (C) 2006-2008 Marvell International Ltd.
* Eric Miao <eric.miao@marvell.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.
*/
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps6586x.h>
#define TPS6586X_SUPPLYENE 0x14
#define EXITSLREQ_BIT BIT(1)
#define SLEEP_MODE_BIT BIT(3)
/* interrupt control registers */
#define TPS6586X_INT_ACK1 0xb5
#define TPS6586X_INT_ACK2 0xb6
#define TPS6586X_INT_ACK3 0xb7
#define TPS6586X_INT_ACK4 0xb8
/* interrupt mask registers */
#define TPS6586X_INT_MASK1 0xb0
#define TPS6586X_INT_MASK2 0xb1
#define TPS6586X_INT_MASK3 0xb2
#define TPS6586X_INT_MASK4 0xb3
#define TPS6586X_INT_MASK5 0xb4
/* device id */
#define TPS6586X_VERSIONCRC 0xcd
/* Maximum register */
#define TPS6586X_MAX_REGISTER (TPS6586X_VERSIONCRC + 1)
struct tps6586x_irq_data {
u8 mask_reg;
u8 mask_mask;
};
#define TPS6586X_IRQ(_reg, _mask) \
{ \
.mask_reg = (_reg) - TPS6586X_INT_MASK1, \
.mask_mask = (_mask), \
}
static const struct tps6586x_irq_data tps6586x_irqs[] = {
[TPS6586X_INT_PLDO_0] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 0),
[TPS6586X_INT_PLDO_1] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 1),
[TPS6586X_INT_PLDO_2] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 2),
[TPS6586X_INT_PLDO_3] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 3),
[TPS6586X_INT_PLDO_4] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 4),
[TPS6586X_INT_PLDO_5] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 5),
[TPS6586X_INT_PLDO_6] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 6),
[TPS6586X_INT_PLDO_7] = TPS6586X_IRQ(TPS6586X_INT_MASK1, 1 << 7),
[TPS6586X_INT_COMP_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 1 << 0),
[TPS6586X_INT_ADC] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 1),
[TPS6586X_INT_PLDO_8] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 2),
[TPS6586X_INT_PLDO_9] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 3),
[TPS6586X_INT_PSM_0] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 4),
[TPS6586X_INT_PSM_1] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 5),
[TPS6586X_INT_PSM_2] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 6),
[TPS6586X_INT_PSM_3] = TPS6586X_IRQ(TPS6586X_INT_MASK2, 1 << 7),
[TPS6586X_INT_RTC_ALM1] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 4),
[TPS6586X_INT_ACUSB_OVP] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 0x03),
[TPS6586X_INT_USB_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 2),
[TPS6586X_INT_AC_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 3),
[TPS6586X_INT_BAT_DET] = TPS6586X_IRQ(TPS6586X_INT_MASK3, 1 << 0),
[TPS6586X_INT_CHG_STAT] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 0xfc),
[TPS6586X_INT_CHG_TEMP] = TPS6586X_IRQ(TPS6586X_INT_MASK3, 0x06),
[TPS6586X_INT_PP] = TPS6586X_IRQ(TPS6586X_INT_MASK3, 0xf0),
[TPS6586X_INT_RESUME] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 5),
[TPS6586X_INT_LOW_SYS] = TPS6586X_IRQ(TPS6586X_INT_MASK5, 1 << 6),
[TPS6586X_INT_RTC_ALM2] = TPS6586X_IRQ(TPS6586X_INT_MASK4, 1 << 1),
};
static struct resource tps6586x_rtc_resources[] = {
{
.start = TPS6586X_INT_RTC_ALM1,
.end = TPS6586X_INT_RTC_ALM1,
.flags = IORESOURCE_IRQ,
},
};
static struct mfd_cell tps6586x_cell[] = {
{
.name = "tps6586x-gpio",
},
{
.name = "tps6586x-pmic",
},
{
.name = "tps6586x-rtc",
.num_resources = ARRAY_SIZE(tps6586x_rtc_resources),
.resources = &tps6586x_rtc_resources[0],
},
{
.name = "tps6586x-onkey",
},
};
struct tps6586x {
struct device *dev;
struct i2c_client *client;
struct regmap *regmap;
struct irq_chip irq_chip;
struct mutex irq_lock;
int irq_base;
u32 irq_en;
u8 mask_reg[5];
struct irq_domain *irq_domain;
};
static inline struct tps6586x *dev_to_tps6586x(struct device *dev)
{
return i2c_get_clientdata(to_i2c_client(dev));
}
int tps6586x_write(struct device *dev, int reg, uint8_t val)
{
struct tps6586x *tps6586x = dev_to_tps6586x(dev);
return regmap_write(tps6586x->regmap, reg, val);
}
EXPORT_SYMBOL_GPL(tps6586x_write);
int tps6586x_writes(struct device *dev, int reg, int len, uint8_t *val)
{
struct tps6586x *tps6586x = dev_to_tps6586x(dev);
return regmap_bulk_write(tps6586x->regmap, reg, val, len);
}
EXPORT_SYMBOL_GPL(tps6586x_writes);
int tps6586x_read(struct device *dev, int reg, uint8_t *val)
{
struct tps6586x *tps6586x = dev_to_tps6586x(dev);
unsigned int rval;
int ret;
ret = regmap_read(tps6586x->regmap, reg, &rval);
if (!ret)
*val = rval;
return ret;
}
EXPORT_SYMBOL_GPL(tps6586x_read);
int tps6586x_reads(struct device *dev, int reg, int len, uint8_t *val)
{
struct tps6586x *tps6586x = dev_to_tps6586x(dev);
return regmap_bulk_read(tps6586x->regmap, reg, val, len);
}
EXPORT_SYMBOL_GPL(tps6586x_reads);
int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
{
struct tps6586x *tps6586x = dev_to_tps6586x(dev);
return regmap_update_bits(tps6586x->regmap, reg, bit_mask, bit_mask);
}
EXPORT_SYMBOL_GPL(tps6586x_set_bits);
int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
{
struct tps6586x *tps6586x = dev_to_tps6586x(dev);
return regmap_update_bits(tps6586x->regmap, reg, bit_mask, 0);
}
EXPORT_SYMBOL_GPL(tps6586x_clr_bits);
int tps6586x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
{
struct tps6586x *tps6586x = dev_to_tps6586x(dev);
return regmap_update_bits(tps6586x->regmap, reg, mask, val);
}
EXPORT_SYMBOL_GPL(tps6586x_update);
int tps6586x_irq_get_virq(struct device *dev, int irq)
{
struct tps6586x *tps6586x = dev_to_tps6586x(dev);
return irq_create_mapping(tps6586x->irq_domain, irq);
}
EXPORT_SYMBOL_GPL(tps6586x_irq_get_virq);
static int __remove_subdev(struct device *dev, void *unused)
{
platform_device_unregister(to_platform_device(dev));
return 0;
}
static int tps6586x_remove_subdevs(struct tps6586x *tps6586x)
{
return device_for_each_child(tps6586x->dev, NULL, __remove_subdev);
}
static void tps6586x_irq_lock(struct irq_data *data)
{
struct tps6586x *tps6586x = irq_data_get_irq_chip_data(data);
mutex_lock(&tps6586x->irq_lock);
}
static void tps6586x_irq_enable(struct irq_data *irq_data)
{
struct tps6586x *tps6586x = irq_data_get_irq_chip_data(irq_data);
unsigned int __irq = irq_data->hwirq;
const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];
tps6586x->mask_reg[data->mask_reg] &= ~data->mask_mask;
tps6586x->irq_en |= (1 << __irq);
}
static void tps6586x_irq_disable(struct irq_data *irq_data)
{
struct tps6586x *tps6586x = irq_data_get_irq_chip_data(irq_data);
unsigned int __irq = irq_data->hwirq;
const struct tps6586x_irq_data *data = &tps6586x_irqs[__irq];
tps6586x->mask_reg[data->mask_reg] |= data->mask_mask;
tps6586x->irq_en &= ~(1 << __irq);
}
static void tps6586x_irq_sync_unlock(struct irq_data *data)
{
struct tps6586x *tps6586x = irq_data_get_irq_chip_data(data);
int i;
for (i = 0; i < ARRAY_SIZE(tps6586x->mask_reg); i++) {
int ret;
ret = tps6586x_write(tps6586x->dev,
TPS6586X_INT_MASK1 + i,
tps6586x->mask_reg[i]);
WARN_ON(ret);
}
mutex_unlock(&tps6586x->irq_lock);
}
static struct irq_chip tps6586x_irq_chip = {
.name = "tps6586x",
.irq_bus_lock = tps6586x_irq_lock,
.irq_bus_sync_unlock = tps6586x_irq_sync_unlock,
.irq_disable = tps6586x_irq_disable,
.irq_enable = tps6586x_irq_enable,
};
static int tps6586x_irq_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
struct tps6586x *tps6586x = h->host_data;
irq_set_chip_data(virq, tps6586x);
irq_set_chip_and_handler(virq, &tps6586x_irq_chip, handle_simple_irq);
irq_set_nested_thread(virq, 1);
/* ARM needs us to explicitly flag the IRQ as valid
* and will set them noprobe when we do so. */
#ifdef CONFIG_ARM
set_irq_flags(virq, IRQF_VALID);
#else
irq_set_noprobe(virq);
#endif
return 0;
}
static struct irq_domain_ops tps6586x_domain_ops = {
.map = tps6586x_irq_map,
.xlate = irq_domain_xlate_twocell,
};
static irqreturn_t tps6586x_irq(int irq, void *data)
{
struct tps6586x *tps6586x = data;
u32 acks;
int ret = 0;
ret = tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1,
sizeof(acks), (uint8_t *)&acks);
if (ret < 0) {
dev_err(tps6586x->dev, "failed to read interrupt status\n");
return IRQ_NONE;
}
acks = le32_to_cpu(acks);
while (acks) {
int i = __ffs(acks);
if (tps6586x->irq_en & (1 << i))
handle_nested_irq(
irq_find_mapping(tps6586x->irq_domain, i));
acks &= ~(1 << i);
}
return IRQ_HANDLED;
}
static int tps6586x_irq_init(struct tps6586x *tps6586x, int irq,
int irq_base)
{
int i, ret;
u8 tmp[4];
int new_irq_base;
int irq_num = ARRAY_SIZE(tps6586x_irqs);
mutex_init(&tps6586x->irq_lock);
for (i = 0; i < 5; i++) {
tps6586x->mask_reg[i] = 0xff;
tps6586x_write(tps6586x->dev, TPS6586X_INT_MASK1 + i, 0xff);
}
tps6586x_reads(tps6586x->dev, TPS6586X_INT_ACK1, sizeof(tmp), tmp);
if (irq_base > 0) {
new_irq_base = irq_alloc_descs(irq_base, 0, irq_num, -1);
if (new_irq_base < 0) {
dev_err(tps6586x->dev,
"Failed to alloc IRQs: %d\n", new_irq_base);
return new_irq_base;
}
} else {
new_irq_base = 0;
}
tps6586x->irq_domain = irq_domain_add_simple(tps6586x->dev->of_node,
irq_num, new_irq_base, &tps6586x_domain_ops,
tps6586x);
if (!tps6586x->irq_domain) {
dev_err(tps6586x->dev, "Failed to create IRQ domain\n");
return -ENOMEM;
}
ret = request_threaded_irq(irq, NULL, tps6586x_irq, IRQF_ONESHOT,
"tps6586x", tps6586x);
if (!ret) {
device_init_wakeup(tps6586x->dev, 1);
enable_irq_wake(irq);
}
return ret;
}
static int tps6586x_add_subdevs(struct tps6586x *tps6586x,
struct tps6586x_platform_data *pdata)
{
struct tps6586x_subdev_info *subdev;
struct platform_device *pdev;
int i, ret = 0;
for (i = 0; i < pdata->num_subdevs; i++) {
subdev = &pdata->subdevs[i];
pdev = platform_device_alloc(subdev->name, subdev->id);
if (!pdev) {
ret = -ENOMEM;
goto failed;
}
pdev->dev.parent = tps6586x->dev;
pdev->dev.platform_data = subdev->platform_data;
pdev->dev.of_node = subdev->of_node;
ret = platform_device_add(pdev);
if (ret) {
platform_device_put(pdev);
goto failed;
}
}
return 0;
failed:
tps6586x_remove_subdevs(tps6586x);
return ret;
}
#ifdef CONFIG_OF
static struct tps6586x_platform_data *tps6586x_parse_dt(struct i2c_client *client)
{
struct device_node *np = client->dev.of_node;
struct tps6586x_platform_data *pdata;
pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
dev_err(&client->dev, "Memory allocation failed\n");
return NULL;
}
pdata->num_subdevs = 0;
pdata->subdevs = NULL;
pdata->gpio_base = -1;
pdata->irq_base = -1;
pdata->pm_off = of_property_read_bool(np, "ti,system-power-controller");
return pdata;
}
static struct of_device_id tps6586x_of_match[] = {
{ .compatible = "ti,tps6586x", },
{ },
};
#else
static struct tps6586x_platform_data *tps6586x_parse_dt(struct i2c_client *client)
{
return NULL;
}
#endif
static bool is_volatile_reg(struct device *dev, unsigned int reg)
{
/* Cache all interrupt mask register */
if ((reg >= TPS6586X_INT_MASK1) && (reg <= TPS6586X_INT_MASK5))
return false;
return true;
}
static const struct regmap_config tps6586x_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = TPS6586X_MAX_REGISTER - 1,
.volatile_reg = is_volatile_reg,
.cache_type = REGCACHE_RBTREE,
};
static struct device *tps6586x_dev;
static void tps6586x_power_off(void)
{
if (tps6586x_clr_bits(tps6586x_dev, TPS6586X_SUPPLYENE, EXITSLREQ_BIT))
return;
tps6586x_set_bits(tps6586x_dev, TPS6586X_SUPPLYENE, SLEEP_MODE_BIT);
}
static int tps6586x_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct tps6586x_platform_data *pdata = client->dev.platform_data;
struct tps6586x *tps6586x;
int ret;
if (!pdata && client->dev.of_node)
pdata = tps6586x_parse_dt(client);
if (!pdata) {
dev_err(&client->dev, "tps6586x requires platform data\n");
return -ENOTSUPP;
}
ret = i2c_smbus_read_byte_data(client, TPS6586X_VERSIONCRC);
if (ret < 0) {
dev_err(&client->dev, "Chip ID read failed: %d\n", ret);
return -EIO;
}
dev_info(&client->dev, "VERSIONCRC is %02x\n", ret);
tps6586x = devm_kzalloc(&client->dev, sizeof(*tps6586x), GFP_KERNEL);
if (tps6586x == NULL) {
dev_err(&client->dev, "memory for tps6586x alloc failed\n");
return -ENOMEM;
}
tps6586x->client = client;
tps6586x->dev = &client->dev;
i2c_set_clientdata(client, tps6586x);
tps6586x->regmap = devm_regmap_init_i2c(client,
&tps6586x_regmap_config);
if (IS_ERR(tps6586x->regmap)) {
ret = PTR_ERR(tps6586x->regmap);
dev_err(&client->dev, "regmap init failed: %d\n", ret);
return ret;
}
if (client->irq) {
ret = tps6586x_irq_init(tps6586x, client->irq,
pdata->irq_base);
if (ret) {
dev_err(&client->dev, "IRQ init failed: %d\n", ret);
return ret;
}
}
ret = mfd_add_devices(tps6586x->dev, -1,
tps6586x_cell, ARRAY_SIZE(tps6586x_cell),
NULL, 0, tps6586x->irq_domain);
if (ret < 0) {
dev_err(&client->dev, "mfd_add_devices failed: %d\n", ret);
goto err_mfd_add;
}
ret = tps6586x_add_subdevs(tps6586x, pdata);
if (ret) {
dev_err(&client->dev, "add devices failed: %d\n", ret);
goto err_add_devs;
}
if (pdata->pm_off && !pm_power_off) {
tps6586x_dev = &client->dev;
pm_power_off = tps6586x_power_off;
}
return 0;
err_add_devs:
mfd_remove_devices(tps6586x->dev);
err_mfd_add:
if (client->irq)
free_irq(client->irq, tps6586x);
return ret;
}
static int tps6586x_i2c_remove(struct i2c_client *client)
{
struct tps6586x *tps6586x = i2c_get_clientdata(client);
tps6586x_remove_subdevs(tps6586x);
mfd_remove_devices(tps6586x->dev);
if (client->irq)
free_irq(client->irq, tps6586x);
return 0;
}
static const struct i2c_device_id tps6586x_id_table[] = {
{ "tps6586x", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, tps6586x_id_table);
static struct i2c_driver tps6586x_driver = {
.driver = {
.name = "tps6586x",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(tps6586x_of_match),
},
.probe = tps6586x_i2c_probe,
.remove = tps6586x_i2c_remove,
.id_table = tps6586x_id_table,
};
static int __init tps6586x_init(void)
{
return i2c_add_driver(&tps6586x_driver);
}
subsys_initcall(tps6586x_init);
static void __exit tps6586x_exit(void)
{
i2c_del_driver(&tps6586x_driver);
}
module_exit(tps6586x_exit);
MODULE_DESCRIPTION("TPS6586X core driver");
MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
MODULE_LICENSE("GPL");
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