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alistair23-linux/drivers/gpio/gpio-adp5588.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* GPIO Chip driver for Analog Devices
* ADP5588/ADP5587 I/O Expander and QWERTY Keypad Controller
*
* Copyright 2009-2010 Analog Devices Inc.
*/
#include <linux/module.h>
#include <linux/kernel.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 02:04:11 -06:00
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/gpio/driver.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/of_device.h>
#include <linux/platform_data/adp5588.h>
#define DRV_NAME "adp5588-gpio"
/*
* Early pre 4.0 Silicon required to delay readout by at least 25ms,
* since the Event Counter Register updated 25ms after the interrupt
* asserted.
*/
#define WA_DELAYED_READOUT_REVID(rev) ((rev) < 4)
struct adp5588_gpio {
struct i2c_client *client;
struct gpio_chip gpio_chip;
struct mutex lock; /* protect cached dir, dat_out */
/* protect serialized access to the interrupt controller bus */
struct mutex irq_lock;
uint8_t dat_out[3];
uint8_t dir[3];
uint8_t int_lvl_low[3];
uint8_t int_lvl_high[3];
uint8_t int_en[3];
uint8_t irq_mask[3];
uint8_t int_input_en[3];
};
static int adp5588_gpio_read(struct i2c_client *client, u8 reg)
{
int ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0)
dev_err(&client->dev, "Read Error\n");
return ret;
}
static int adp5588_gpio_write(struct i2c_client *client, u8 reg, u8 val)
{
int ret = i2c_smbus_write_byte_data(client, reg, val);
if (ret < 0)
dev_err(&client->dev, "Write Error\n");
return ret;
}
static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off)
{
struct adp5588_gpio *dev = gpiochip_get_data(chip);
unsigned bank = ADP5588_BANK(off);
unsigned bit = ADP5588_BIT(off);
int val;
mutex_lock(&dev->lock);
if (dev->dir[bank] & bit)
val = dev->dat_out[bank];
else
val = adp5588_gpio_read(dev->client, GPIO_DAT_STAT1 + bank);
mutex_unlock(&dev->lock);
return !!(val & bit);
}
static void adp5588_gpio_set_value(struct gpio_chip *chip,
unsigned off, int val)
{
unsigned bank, bit;
struct adp5588_gpio *dev = gpiochip_get_data(chip);
bank = ADP5588_BANK(off);
bit = ADP5588_BIT(off);
mutex_lock(&dev->lock);
if (val)
dev->dat_out[bank] |= bit;
else
dev->dat_out[bank] &= ~bit;
adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
dev->dat_out[bank]);
mutex_unlock(&dev->lock);
}
static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off)
{
int ret;
unsigned bank;
struct adp5588_gpio *dev = gpiochip_get_data(chip);
bank = ADP5588_BANK(off);
mutex_lock(&dev->lock);
dev->dir[bank] &= ~ADP5588_BIT(off);
ret = adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, dev->dir[bank]);
mutex_unlock(&dev->lock);
return ret;
}
static int adp5588_gpio_direction_output(struct gpio_chip *chip,
unsigned off, int val)
{
int ret;
unsigned bank, bit;
struct adp5588_gpio *dev = gpiochip_get_data(chip);
bank = ADP5588_BANK(off);
bit = ADP5588_BIT(off);
mutex_lock(&dev->lock);
dev->dir[bank] |= bit;
if (val)
dev->dat_out[bank] |= bit;
else
dev->dat_out[bank] &= ~bit;
ret = adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
dev->dat_out[bank]);
ret |= adp5588_gpio_write(dev->client, GPIO_DIR1 + bank,
dev->dir[bank]);
mutex_unlock(&dev->lock);
return ret;
}
#ifdef CONFIG_GPIO_ADP5588_IRQ
static void adp5588_irq_bus_lock(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct adp5588_gpio *dev = gpiochip_get_data(gc);
mutex_lock(&dev->irq_lock);
}
/*
* genirq core code can issue chip->mask/unmask from atomic context.
* This doesn't work for slow busses where an access needs to sleep.
* bus_sync_unlock() is therefore called outside the atomic context,
* syncs the current irq mask state with the slow external controller
* and unlocks the bus.
*/
static void adp5588_irq_bus_sync_unlock(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct adp5588_gpio *dev = gpiochip_get_data(gc);
int i;
for (i = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
if (dev->int_input_en[i]) {
mutex_lock(&dev->lock);
dev->dir[i] &= ~dev->int_input_en[i];
dev->int_input_en[i] = 0;
adp5588_gpio_write(dev->client, GPIO_DIR1 + i,
dev->dir[i]);
mutex_unlock(&dev->lock);
}
if (dev->int_en[i] ^ dev->irq_mask[i]) {
dev->int_en[i] = dev->irq_mask[i];
adp5588_gpio_write(dev->client, GPI_EM1 + i,
dev->int_en[i]);
}
}
mutex_unlock(&dev->irq_lock);
}
static void adp5588_irq_mask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct adp5588_gpio *dev = gpiochip_get_data(gc);
dev->irq_mask[ADP5588_BANK(d->hwirq)] &= ~ADP5588_BIT(d->hwirq);
}
static void adp5588_irq_unmask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct adp5588_gpio *dev = gpiochip_get_data(gc);
dev->irq_mask[ADP5588_BANK(d->hwirq)] |= ADP5588_BIT(d->hwirq);
}
static int adp5588_irq_set_type(struct irq_data *d, unsigned int type)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct adp5588_gpio *dev = gpiochip_get_data(gc);
uint16_t gpio = d->hwirq;
unsigned bank, bit;
bank = ADP5588_BANK(gpio);
bit = ADP5588_BIT(gpio);
dev->int_lvl_low[bank] &= ~bit;
dev->int_lvl_high[bank] &= ~bit;
if (type & IRQ_TYPE_EDGE_BOTH || type & IRQ_TYPE_LEVEL_HIGH)
dev->int_lvl_high[bank] |= bit;
if (type & IRQ_TYPE_EDGE_BOTH || type & IRQ_TYPE_LEVEL_LOW)
dev->int_lvl_low[bank] |= bit;
dev->int_input_en[bank] |= bit;
return 0;
}
static struct irq_chip adp5588_irq_chip = {
.name = "adp5588",
.irq_mask = adp5588_irq_mask,
.irq_unmask = adp5588_irq_unmask,
.irq_bus_lock = adp5588_irq_bus_lock,
.irq_bus_sync_unlock = adp5588_irq_bus_sync_unlock,
.irq_set_type = adp5588_irq_set_type,
};
static irqreturn_t adp5588_irq_handler(int irq, void *devid)
{
struct adp5588_gpio *dev = devid;
int status = adp5588_gpio_read(dev->client, INT_STAT);
if (status & ADP5588_KE_INT) {
int ev_cnt = adp5588_gpio_read(dev->client, KEY_LCK_EC_STAT);
if (ev_cnt > 0) {
int i;
for (i = 0; i < (ev_cnt & ADP5588_KEC); i++) {
int key = adp5588_gpio_read(dev->client,
Key_EVENTA + i);
/* GPIN events begin at 97,
* bit 7 indicates logic level
*/
int gpio = (key & 0x7f) - 97;
int lvl = key & (1 << 7);
int bank = ADP5588_BANK(gpio);
int bit = ADP5588_BIT(gpio);
if ((lvl && dev->int_lvl_high[bank] & bit) ||
(!lvl && dev->int_lvl_low[bank] & bit))
handle_nested_irq(irq_find_mapping(
dev->gpio_chip.irq.domain, gpio));
}
}
}
adp5588_gpio_write(dev->client, INT_STAT, status); /* Status is W1C */
return IRQ_HANDLED;
}
static int adp5588_irq_setup(struct adp5588_gpio *dev)
{
struct i2c_client *client = dev->client;
int ret;
struct adp5588_gpio_platform_data *pdata =
dev_get_platdata(&client->dev);
int irq_base = pdata ? pdata->irq_base : 0;
adp5588_gpio_write(client, CFG, ADP5588_AUTO_INC);
adp5588_gpio_write(client, INT_STAT, -1); /* status is W1C */
mutex_init(&dev->irq_lock);
ret = devm_request_threaded_irq(&client->dev, client->irq,
NULL, adp5588_irq_handler, IRQF_ONESHOT
| IRQF_TRIGGER_FALLING | IRQF_SHARED,
dev_name(&client->dev), dev);
if (ret) {
dev_err(&client->dev, "failed to request irq %d\n",
client->irq);
return ret;
}
ret = gpiochip_irqchip_add_nested(&dev->gpio_chip,
&adp5588_irq_chip, irq_base,
handle_simple_irq,
IRQ_TYPE_NONE);
if (ret) {
dev_err(&client->dev,
"could not connect irqchip to gpiochip\n");
return ret;
}
gpiochip_set_nested_irqchip(&dev->gpio_chip,
&adp5588_irq_chip,
client->irq);
adp5588_gpio_write(client, CFG,
ADP5588_AUTO_INC | ADP5588_INT_CFG | ADP5588_KE_IEN);
return 0;
}
#else
static int adp5588_irq_setup(struct adp5588_gpio *dev)
{
struct i2c_client *client = dev->client;
dev_warn(&client->dev, "interrupt support not compiled in\n");
return 0;
}
#endif /* CONFIG_GPIO_ADP5588_IRQ */
static int adp5588_gpio_probe(struct i2c_client *client)
{
struct adp5588_gpio_platform_data *pdata =
dev_get_platdata(&client->dev);
struct adp5588_gpio *dev;
struct gpio_chip *gc;
int ret, i, revid;
unsigned int pullup_dis_mask = 0;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
return -EIO;
}
dev = devm_kzalloc(&client->dev, sizeof(*dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
dev->client = client;
gc = &dev->gpio_chip;
gc->direction_input = adp5588_gpio_direction_input;
gc->direction_output = adp5588_gpio_direction_output;
gc->get = adp5588_gpio_get_value;
gc->set = adp5588_gpio_set_value;
gc->can_sleep = true;
gc->base = -1;
gc->parent = &client->dev;
if (pdata) {
gc->base = pdata->gpio_start;
gc->names = pdata->names;
pullup_dis_mask = pdata->pullup_dis_mask;
}
gc->ngpio = ADP5588_MAXGPIO;
gc->label = client->name;
gc->owner = THIS_MODULE;
mutex_init(&dev->lock);
ret = adp5588_gpio_read(dev->client, DEV_ID);
if (ret < 0)
return ret;
revid = ret & ADP5588_DEVICE_ID_MASK;
for (i = 0, ret = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
dev->dat_out[i] = adp5588_gpio_read(client, GPIO_DAT_OUT1 + i);
dev->dir[i] = adp5588_gpio_read(client, GPIO_DIR1 + i);
ret |= adp5588_gpio_write(client, KP_GPIO1 + i, 0);
ret |= adp5588_gpio_write(client, GPIO_PULL1 + i,
(pullup_dis_mask >> (8 * i)) & 0xFF);
ret |= adp5588_gpio_write(client, GPIO_INT_EN1 + i, 0);
if (ret)
return ret;
}
if (client->irq) {
if (WA_DELAYED_READOUT_REVID(revid)) {
dev_warn(&client->dev, "GPIO int not supported\n");
} else {
ret = adp5588_irq_setup(dev);
if (ret)
return ret;
}
}
ret = devm_gpiochip_add_data(&client->dev, &dev->gpio_chip, dev);
if (ret)
return ret;
if (pdata && pdata->setup) {
ret = pdata->setup(client, gc->base, gc->ngpio, pdata->context);
if (ret < 0)
dev_warn(&client->dev, "setup failed, %d\n", ret);
}
i2c_set_clientdata(client, dev);
return 0;
}
static int adp5588_gpio_remove(struct i2c_client *client)
{
struct adp5588_gpio_platform_data *pdata =
dev_get_platdata(&client->dev);
struct adp5588_gpio *dev = i2c_get_clientdata(client);
int ret;
if (pdata && pdata->teardown) {
ret = pdata->teardown(client,
dev->gpio_chip.base, dev->gpio_chip.ngpio,
pdata->context);
if (ret < 0) {
dev_err(&client->dev, "teardown failed %d\n", ret);
return ret;
}
}
if (dev->client->irq)
free_irq(dev->client->irq, dev);
return 0;
}
static const struct i2c_device_id adp5588_gpio_id[] = {
{DRV_NAME, 0},
{}
};
MODULE_DEVICE_TABLE(i2c, adp5588_gpio_id);
#ifdef CONFIG_OF
static const struct of_device_id adp5588_gpio_of_id[] = {
{ .compatible = "adi," DRV_NAME, },
{},
};
MODULE_DEVICE_TABLE(of, adp5588_gpio_of_id);
#endif
static struct i2c_driver adp5588_gpio_driver = {
.driver = {
.name = DRV_NAME,
.of_match_table = of_match_ptr(adp5588_gpio_of_id),
},
.probe_new = adp5588_gpio_probe,
.remove = adp5588_gpio_remove,
.id_table = adp5588_gpio_id,
};
module_i2c_driver(adp5588_gpio_driver);
MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
MODULE_DESCRIPTION("GPIO ADP5588 Driver");
MODULE_LICENSE("GPL");