+++ /dev/null
-// 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/gpio/driver.h>
-#include <linux/i2c.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/kernel.h>
-#include <linux/mod_devicetable.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-
-#include <linux/platform_data/adp5588.h>
-
-/*
- * 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_init_hw(struct gpio_chip *gc)
-{
- struct adp5588_gpio *dev = gpiochip_get_data(gc);
- /* Enable IRQs after registering chip */
- adp5588_gpio_write(dev->client, CFG,
- ADP5588_AUTO_INC | ADP5588_INT_CFG | ADP5588_KE_IEN);
-
- return 0;
-}
-
-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);
- struct gpio_irq_chip *girq;
-
- 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;
- }
-
- /* This will be registered in the call to devm_gpiochip_add_data() */
- girq = &dev->gpio_chip.irq;
- girq->chip = &adp5588_irq_chip;
- /* This will let us handle the parent IRQ in the driver */
- girq->parent_handler = NULL;
- girq->num_parents = 0;
- girq->parents = NULL;
- girq->first = pdata ? pdata->irq_base : 0;
- girq->default_type = IRQ_TYPE_NONE;
- girq->handler = handle_simple_irq;
- girq->init_hw = adp5588_irq_init_hw;
- girq->threaded = true;
-
- 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;
-
- i2c_set_clientdata(client, dev);
-
- return 0;
-}
-
-static void adp5588_gpio_remove(struct i2c_client *client)
-{
- struct adp5588_gpio *dev = i2c_get_clientdata(client);
-
- if (dev->client->irq)
- free_irq(dev->client->irq, dev);
-}
-
-static const struct i2c_device_id adp5588_gpio_id[] = {
- { "adp5588-gpio" },
- {}
-};
-MODULE_DEVICE_TABLE(i2c, adp5588_gpio_id);
-
-static const struct of_device_id adp5588_gpio_of_id[] = {
- { .compatible = "adi,adp5588-gpio" },
- {}
-};
-MODULE_DEVICE_TABLE(of, adp5588_gpio_of_id);
-
-static struct i2c_driver adp5588_gpio_driver = {
- .driver = {
- .name = "adp5588-gpio",
- .of_match_table = 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");
projects / kernel.git / commitdiff