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linux/drivers/mfd/tc3589x.c

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/*
* Copyright (C) ST-Ericsson SA 2010
*
* License Terms: GNU General Public License, version 2
* Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tc3589x.h>
#include <linux/err.h>
/**
* enum tc3589x_version - indicates the TC3589x version
*/
enum tc3589x_version {
TC3589X_TC35890,
TC3589X_TC35892,
TC3589X_TC35893,
TC3589X_TC35894,
TC3589X_TC35895,
TC3589X_TC35896,
TC3589X_UNKNOWN,
};
#define TC3589x_CLKMODE_MODCTL_SLEEP 0x0
#define TC3589x_CLKMODE_MODCTL_OPERATION (1 << 0)
/**
* tc3589x_reg_read() - read a single TC3589x register
* @tc3589x: Device to read from
* @reg: Register to read
*/
int tc3589x_reg_read(struct tc3589x *tc3589x, u8 reg)
{
int ret;
ret = i2c_smbus_read_byte_data(tc3589x->i2c, reg);
if (ret < 0)
dev_err(tc3589x->dev, "failed to read reg %#x: %d\n",
reg, ret);
return ret;
}
EXPORT_SYMBOL_GPL(tc3589x_reg_read);
/**
* tc3589x_reg_read() - write a single TC3589x register
* @tc3589x: Device to write to
* @reg: Register to read
* @data: Value to write
*/
int tc3589x_reg_write(struct tc3589x *tc3589x, u8 reg, u8 data)
{
int ret;
ret = i2c_smbus_write_byte_data(tc3589x->i2c, reg, data);
if (ret < 0)
dev_err(tc3589x->dev, "failed to write reg %#x: %d\n",
reg, ret);
return ret;
}
EXPORT_SYMBOL_GPL(tc3589x_reg_write);
/**
* tc3589x_block_read() - read multiple TC3589x registers
* @tc3589x: Device to read from
* @reg: First register
* @length: Number of registers
* @values: Buffer to write to
*/
int tc3589x_block_read(struct tc3589x *tc3589x, u8 reg, u8 length, u8 *values)
{
int ret;
ret = i2c_smbus_read_i2c_block_data(tc3589x->i2c, reg, length, values);
if (ret < 0)
dev_err(tc3589x->dev, "failed to read regs %#x: %d\n",
reg, ret);
return ret;
}
EXPORT_SYMBOL_GPL(tc3589x_block_read);
/**
* tc3589x_block_write() - write multiple TC3589x registers
* @tc3589x: Device to write to
* @reg: First register
* @length: Number of registers
* @values: Values to write
*/
int tc3589x_block_write(struct tc3589x *tc3589x, u8 reg, u8 length,
const u8 *values)
{
int ret;
ret = i2c_smbus_write_i2c_block_data(tc3589x->i2c, reg, length,
values);
if (ret < 0)
dev_err(tc3589x->dev, "failed to write regs %#x: %d\n",
reg, ret);
return ret;
}
EXPORT_SYMBOL_GPL(tc3589x_block_write);
/**
* tc3589x_set_bits() - set the value of a bitfield in a TC3589x register
* @tc3589x: Device to write to
* @reg: Register to write
* @mask: Mask of bits to set
* @values: Value to set
*/
int tc3589x_set_bits(struct tc3589x *tc3589x, u8 reg, u8 mask, u8 val)
{
int ret;
mutex_lock(&tc3589x->lock);
ret = tc3589x_reg_read(tc3589x, reg);
if (ret < 0)
goto out;
ret &= ~mask;
ret |= val;
ret = tc3589x_reg_write(tc3589x, reg, ret);
out:
mutex_unlock(&tc3589x->lock);
return ret;
}
EXPORT_SYMBOL_GPL(tc3589x_set_bits);
static struct resource gpio_resources[] = {
{
.start = TC3589x_INT_GPIIRQ,
.end = TC3589x_INT_GPIIRQ,
.flags = IORESOURCE_IRQ,
},
};
static struct resource keypad_resources[] = {
{
.start = TC3589x_INT_KBDIRQ,
.end = TC3589x_INT_KBDIRQ,
.flags = IORESOURCE_IRQ,
},
};
static const struct mfd_cell tc3589x_dev_gpio[] = {
{
.name = "tc3589x-gpio",
.num_resources = ARRAY_SIZE(gpio_resources),
.resources = &gpio_resources[0],
.of_compatible = "toshiba,tc3589x-gpio",
},
};
static const struct mfd_cell tc3589x_dev_keypad[] = {
{
.name = "tc3589x-keypad",
.num_resources = ARRAY_SIZE(keypad_resources),
.resources = &keypad_resources[0],
.of_compatible = "toshiba,tc3589x-keypad",
},
};
static irqreturn_t tc3589x_irq(int irq, void *data)
{
struct tc3589x *tc3589x = data;
int status;
again:
status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
if (status < 0)
return IRQ_NONE;
while (status) {
int bit = __ffs(status);
int virq = irq_create_mapping(tc3589x->domain, bit);
handle_nested_irq(virq);
status &= ~(1 << bit);
}
/*
* A dummy read or write (to any register) appears to be necessary to
* have the last interrupt clear (for example, GPIO IC write) take
* effect. In such a case, recheck for any interrupt which is still
* pending.
*/
status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
if (status)
goto again;
return IRQ_HANDLED;
}
static int tc3589x_irq_map(struct irq_domain *d, unsigned int virq,
irq_hw_number_t hwirq)
{
struct tc3589x *tc3589x = d->host_data;
irq_set_chip_data(virq, tc3589x);
irq_set_chip_and_handler(virq, &dummy_irq_chip,
handle_edge_irq);
irq_set_nested_thread(virq, 1);
irq_set_noprobe(virq);
return 0;
}
static void tc3589x_irq_unmap(struct irq_domain *d, unsigned int virq)
{
irq_set_chip_and_handler(virq, NULL, NULL);
irq_set_chip_data(virq, NULL);
}
static const struct irq_domain_ops tc3589x_irq_ops = {
.map = tc3589x_irq_map,
.unmap = tc3589x_irq_unmap,
.xlate = irq_domain_xlate_onecell,
};
static int tc3589x_irq_init(struct tc3589x *tc3589x, struct device_node *np)
{
tc3589x->domain = irq_domain_add_simple(
np, TC3589x_NR_INTERNAL_IRQS, 0,
&tc3589x_irq_ops, tc3589x);
if (!tc3589x->domain) {
dev_err(tc3589x->dev, "Failed to create irqdomain\n");
return -ENOSYS;
}
return 0;
}
static int tc3589x_chip_init(struct tc3589x *tc3589x)
{
int manf, ver, ret;
manf = tc3589x_reg_read(tc3589x, TC3589x_MANFCODE);
if (manf < 0)
return manf;
ver = tc3589x_reg_read(tc3589x, TC3589x_VERSION);
if (ver < 0)
return ver;
if (manf != TC3589x_MANFCODE_MAGIC) {
dev_err(tc3589x->dev, "unknown manufacturer: %#x\n", manf);
return -EINVAL;
}
dev_info(tc3589x->dev, "manufacturer: %#x, version: %#x\n", manf, ver);
/*
* Put everything except the IRQ module into reset;
* also spare the GPIO module for any pin initialization
* done during pre-kernel boot
*/
ret = tc3589x_reg_write(tc3589x, TC3589x_RSTCTRL,
TC3589x_RSTCTRL_TIMRST
| TC3589x_RSTCTRL_ROTRST
| TC3589x_RSTCTRL_KBDRST);
if (ret < 0)
return ret;
/* Clear the reset interrupt. */
return tc3589x_reg_write(tc3589x, TC3589x_RSTINTCLR, 0x1);
}
static int tc3589x_device_init(struct tc3589x *tc3589x)
{
int ret = 0;
unsigned int blocks = tc3589x->pdata->block;
if (blocks & TC3589x_BLOCK_GPIO) {
ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_gpio,
ARRAY_SIZE(tc3589x_dev_gpio), NULL,
0, tc3589x->domain);
if (ret) {
dev_err(tc3589x->dev, "failed to add gpio child\n");
return ret;
}
dev_info(tc3589x->dev, "added gpio block\n");
}
if (blocks & TC3589x_BLOCK_KEYPAD) {
ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_dev_keypad,
ARRAY_SIZE(tc3589x_dev_keypad), NULL,
0, tc3589x->domain);
if (ret) {
dev_err(tc3589x->dev, "failed to keypad child\n");
return ret;
}
dev_info(tc3589x->dev, "added keypad block\n");
}
return ret;
}
static const struct of_device_id tc3589x_match[] = {
/* Legacy compatible string */
{ .compatible = "tc3589x", .data = (void *) TC3589X_UNKNOWN },
{ .compatible = "toshiba,tc35890", .data = (void *) TC3589X_TC35890 },
{ .compatible = "toshiba,tc35892", .data = (void *) TC3589X_TC35892 },
{ .compatible = "toshiba,tc35893", .data = (void *) TC3589X_TC35893 },
{ .compatible = "toshiba,tc35894", .data = (void *) TC3589X_TC35894 },
{ .compatible = "toshiba,tc35895", .data = (void *) TC3589X_TC35895 },
{ .compatible = "toshiba,tc35896", .data = (void *) TC3589X_TC35896 },
{ }
};
MODULE_DEVICE_TABLE(of, tc3589x_match);
static struct tc3589x_platform_data *
tc3589x_of_probe(struct device *dev, enum tc3589x_version *version)
{
struct device_node *np = dev->of_node;
struct tc3589x_platform_data *pdata;
struct device_node *child;
const struct of_device_id *of_id;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return ERR_PTR(-ENOMEM);
of_id = of_match_device(tc3589x_match, dev);
if (!of_id)
return ERR_PTR(-ENODEV);
*version = (enum tc3589x_version) of_id->data;
for_each_child_of_node(np, child) {
if (of_device_is_compatible(child, "toshiba,tc3589x-gpio"))
pdata->block |= TC3589x_BLOCK_GPIO;
if (of_device_is_compatible(child, "toshiba,tc3589x-keypad"))
pdata->block |= TC3589x_BLOCK_KEYPAD;
}
return pdata;
}
static int tc3589x_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct device_node *np = i2c->dev.of_node;
struct tc3589x_platform_data *pdata = dev_get_platdata(&i2c->dev);
struct tc3589x *tc3589x;
enum tc3589x_version version;
int ret;
if (!pdata) {
pdata = tc3589x_of_probe(&i2c->dev, &version);
if (IS_ERR(pdata)) {
dev_err(&i2c->dev, "No platform data or DT found\n");
return PTR_ERR(pdata);
}
} else {
/* When not probing from device tree we have this ID */
version = id->driver_data;
}
if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
| I2C_FUNC_SMBUS_I2C_BLOCK))
return -EIO;
tc3589x = devm_kzalloc(&i2c->dev, sizeof(struct tc3589x),
GFP_KERNEL);
if (!tc3589x)
return -ENOMEM;
mutex_init(&tc3589x->lock);
tc3589x->dev = &i2c->dev;
tc3589x->i2c = i2c;
tc3589x->pdata = pdata;
switch (version) {
case TC3589X_TC35893:
case TC3589X_TC35895:
case TC3589X_TC35896:
tc3589x->num_gpio = 20;
break;
case TC3589X_TC35890:
case TC3589X_TC35892:
case TC3589X_TC35894:
case TC3589X_UNKNOWN:
default:
tc3589x->num_gpio = 24;
break;
}
i2c_set_clientdata(i2c, tc3589x);
ret = tc3589x_chip_init(tc3589x);
if (ret)
return ret;
ret = tc3589x_irq_init(tc3589x, np);
if (ret)
return ret;
ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq,
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
"tc3589x", tc3589x);
if (ret) {
dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret);
return ret;
}
ret = tc3589x_device_init(tc3589x);
if (ret) {
dev_err(tc3589x->dev, "failed to add child devices\n");
return ret;
}
return 0;
}
static int tc3589x_remove(struct i2c_client *client)
{
struct tc3589x *tc3589x = i2c_get_clientdata(client);
mfd_remove_devices(tc3589x->dev);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int tc3589x_suspend(struct device *dev)
{
struct tc3589x *tc3589x = dev_get_drvdata(dev);
struct i2c_client *client = tc3589x->i2c;
int ret = 0;
/* put the system to sleep mode */
if (!device_may_wakeup(&client->dev))
ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
TC3589x_CLKMODE_MODCTL_SLEEP);
return ret;
}
static int tc3589x_resume(struct device *dev)
{
struct tc3589x *tc3589x = dev_get_drvdata(dev);
struct i2c_client *client = tc3589x->i2c;
int ret = 0;
/* enable the system into operation */
if (!device_may_wakeup(&client->dev))
ret = tc3589x_reg_write(tc3589x, TC3589x_CLKMODE,
TC3589x_CLKMODE_MODCTL_OPERATION);
return ret;
}
#endif
static SIMPLE_DEV_PM_OPS(tc3589x_dev_pm_ops, tc3589x_suspend, tc3589x_resume);
static const struct i2c_device_id tc3589x_id[] = {
{ "tc35890", TC3589X_TC35890 },
{ "tc35892", TC3589X_TC35892 },
{ "tc35893", TC3589X_TC35893 },
{ "tc35894", TC3589X_TC35894 },
{ "tc35895", TC3589X_TC35895 },
{ "tc35896", TC3589X_TC35896 },
{ "tc3589x", TC3589X_UNKNOWN },
{ }
};
MODULE_DEVICE_TABLE(i2c, tc3589x_id);
static struct i2c_driver tc3589x_driver = {
.driver = {
.name = "tc3589x",
.pm = &tc3589x_dev_pm_ops,
.of_match_table = of_match_ptr(tc3589x_match),
},
.probe = tc3589x_probe,
.remove = tc3589x_remove,
.id_table = tc3589x_id,
};
static int __init tc3589x_init(void)
{
return i2c_add_driver(&tc3589x_driver);
}
subsys_initcall(tc3589x_init);
static void __exit tc3589x_exit(void)
{
i2c_del_driver(&tc3589x_driver);
}
module_exit(tc3589x_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("TC3589x MFD core driver");
MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");
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