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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Wolfram Sang](/assets/img/avatar_default.png)
include/linux/i2c is not for client devices. Move the header file to a more appropriate location. Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
483 lines
11 KiB
C
483 lines
11 KiB
C
/*
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* GPIO Chip driver for Analog Devices
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* ADP5588/ADP5587 I/O Expander and QWERTY Keypad Controller
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*
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* Copyright 2009-2010 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/gpio.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/platform_data/adp5588.h>
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#define DRV_NAME "adp5588-gpio"
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/*
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* Early pre 4.0 Silicon required to delay readout by at least 25ms,
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* since the Event Counter Register updated 25ms after the interrupt
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* asserted.
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*/
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#define WA_DELAYED_READOUT_REVID(rev) ((rev) < 4)
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struct adp5588_gpio {
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struct i2c_client *client;
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struct gpio_chip gpio_chip;
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struct mutex lock; /* protect cached dir, dat_out */
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/* protect serialized access to the interrupt controller bus */
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struct mutex irq_lock;
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unsigned gpio_start;
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unsigned irq_base;
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uint8_t dat_out[3];
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uint8_t dir[3];
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uint8_t int_lvl[3];
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uint8_t int_en[3];
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uint8_t irq_mask[3];
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uint8_t irq_stat[3];
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};
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static int adp5588_gpio_read(struct i2c_client *client, u8 reg)
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{
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int ret = i2c_smbus_read_byte_data(client, reg);
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if (ret < 0)
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dev_err(&client->dev, "Read Error\n");
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return ret;
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}
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static int adp5588_gpio_write(struct i2c_client *client, u8 reg, u8 val)
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{
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int ret = i2c_smbus_write_byte_data(client, reg, val);
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if (ret < 0)
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dev_err(&client->dev, "Write Error\n");
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return ret;
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}
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static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off)
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{
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struct adp5588_gpio *dev = gpiochip_get_data(chip);
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unsigned bank = ADP5588_BANK(off);
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unsigned bit = ADP5588_BIT(off);
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int val;
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mutex_lock(&dev->lock);
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if (dev->dir[bank] & bit)
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val = dev->dat_out[bank];
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else
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val = adp5588_gpio_read(dev->client, GPIO_DAT_STAT1 + bank);
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mutex_unlock(&dev->lock);
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return !!(val & bit);
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}
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static void adp5588_gpio_set_value(struct gpio_chip *chip,
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unsigned off, int val)
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{
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unsigned bank, bit;
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struct adp5588_gpio *dev = gpiochip_get_data(chip);
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bank = ADP5588_BANK(off);
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bit = ADP5588_BIT(off);
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mutex_lock(&dev->lock);
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if (val)
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dev->dat_out[bank] |= bit;
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else
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dev->dat_out[bank] &= ~bit;
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adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
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dev->dat_out[bank]);
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mutex_unlock(&dev->lock);
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}
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static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off)
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{
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int ret;
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unsigned bank;
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struct adp5588_gpio *dev = gpiochip_get_data(chip);
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bank = ADP5588_BANK(off);
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mutex_lock(&dev->lock);
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dev->dir[bank] &= ~ADP5588_BIT(off);
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ret = adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, dev->dir[bank]);
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mutex_unlock(&dev->lock);
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return ret;
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}
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static int adp5588_gpio_direction_output(struct gpio_chip *chip,
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unsigned off, int val)
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{
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int ret;
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unsigned bank, bit;
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struct adp5588_gpio *dev = gpiochip_get_data(chip);
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bank = ADP5588_BANK(off);
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bit = ADP5588_BIT(off);
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mutex_lock(&dev->lock);
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dev->dir[bank] |= bit;
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if (val)
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dev->dat_out[bank] |= bit;
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else
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dev->dat_out[bank] &= ~bit;
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ret = adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank,
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dev->dat_out[bank]);
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ret |= adp5588_gpio_write(dev->client, GPIO_DIR1 + bank,
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dev->dir[bank]);
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mutex_unlock(&dev->lock);
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return ret;
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}
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#ifdef CONFIG_GPIO_ADP5588_IRQ
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static int adp5588_gpio_to_irq(struct gpio_chip *chip, unsigned off)
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{
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struct adp5588_gpio *dev = gpiochip_get_data(chip);
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return dev->irq_base + off;
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}
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static void adp5588_irq_bus_lock(struct irq_data *d)
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{
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struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d);
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mutex_lock(&dev->irq_lock);
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}
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/*
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* genirq core code can issue chip->mask/unmask from atomic context.
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* This doesn't work for slow busses where an access needs to sleep.
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* bus_sync_unlock() is therefore called outside the atomic context,
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* syncs the current irq mask state with the slow external controller
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* and unlocks the bus.
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*/
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static void adp5588_irq_bus_sync_unlock(struct irq_data *d)
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{
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struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d);
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int i;
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for (i = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++)
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if (dev->int_en[i] ^ dev->irq_mask[i]) {
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dev->int_en[i] = dev->irq_mask[i];
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adp5588_gpio_write(dev->client, GPIO_INT_EN1 + i,
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dev->int_en[i]);
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}
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mutex_unlock(&dev->irq_lock);
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}
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static void adp5588_irq_mask(struct irq_data *d)
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{
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struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d);
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unsigned gpio = d->irq - dev->irq_base;
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dev->irq_mask[ADP5588_BANK(gpio)] &= ~ADP5588_BIT(gpio);
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}
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static void adp5588_irq_unmask(struct irq_data *d)
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{
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struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d);
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unsigned gpio = d->irq - dev->irq_base;
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dev->irq_mask[ADP5588_BANK(gpio)] |= ADP5588_BIT(gpio);
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}
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static int adp5588_irq_set_type(struct irq_data *d, unsigned int type)
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{
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struct adp5588_gpio *dev = irq_data_get_irq_chip_data(d);
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uint16_t gpio = d->irq - dev->irq_base;
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unsigned bank, bit;
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if ((type & IRQ_TYPE_EDGE_BOTH)) {
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dev_err(&dev->client->dev, "irq %d: unsupported type %d\n",
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d->irq, type);
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return -EINVAL;
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}
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bank = ADP5588_BANK(gpio);
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bit = ADP5588_BIT(gpio);
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if (type & IRQ_TYPE_LEVEL_HIGH)
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dev->int_lvl[bank] |= bit;
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else if (type & IRQ_TYPE_LEVEL_LOW)
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dev->int_lvl[bank] &= ~bit;
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else
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return -EINVAL;
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adp5588_gpio_direction_input(&dev->gpio_chip, gpio);
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adp5588_gpio_write(dev->client, GPIO_INT_LVL1 + bank,
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dev->int_lvl[bank]);
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return 0;
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}
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static struct irq_chip adp5588_irq_chip = {
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.name = "adp5588",
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.irq_mask = adp5588_irq_mask,
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.irq_unmask = adp5588_irq_unmask,
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.irq_bus_lock = adp5588_irq_bus_lock,
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.irq_bus_sync_unlock = adp5588_irq_bus_sync_unlock,
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.irq_set_type = adp5588_irq_set_type,
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};
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static int adp5588_gpio_read_intstat(struct i2c_client *client, u8 *buf)
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{
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int ret = i2c_smbus_read_i2c_block_data(client, GPIO_INT_STAT1, 3, buf);
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if (ret < 0)
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dev_err(&client->dev, "Read INT_STAT Error\n");
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return ret;
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}
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static irqreturn_t adp5588_irq_handler(int irq, void *devid)
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{
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struct adp5588_gpio *dev = devid;
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unsigned status, bank, bit, pending;
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int ret;
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status = adp5588_gpio_read(dev->client, INT_STAT);
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if (status & ADP5588_GPI_INT) {
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ret = adp5588_gpio_read_intstat(dev->client, dev->irq_stat);
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if (ret < 0)
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memset(dev->irq_stat, 0, ARRAY_SIZE(dev->irq_stat));
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for (bank = 0, bit = 0; bank <= ADP5588_BANK(ADP5588_MAXGPIO);
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bank++, bit = 0) {
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pending = dev->irq_stat[bank] & dev->irq_mask[bank];
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while (pending) {
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if (pending & (1 << bit)) {
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handle_nested_irq(dev->irq_base +
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(bank << 3) + bit);
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pending &= ~(1 << bit);
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}
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bit++;
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}
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}
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}
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adp5588_gpio_write(dev->client, INT_STAT, status); /* Status is W1C */
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return IRQ_HANDLED;
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}
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static int adp5588_irq_setup(struct adp5588_gpio *dev)
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{
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struct i2c_client *client = dev->client;
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struct adp5588_gpio_platform_data *pdata =
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dev_get_platdata(&client->dev);
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unsigned gpio;
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int ret;
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adp5588_gpio_write(client, CFG, ADP5588_AUTO_INC);
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adp5588_gpio_write(client, INT_STAT, -1); /* status is W1C */
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adp5588_gpio_read_intstat(client, dev->irq_stat); /* read to clear */
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dev->irq_base = pdata->irq_base;
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mutex_init(&dev->irq_lock);
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for (gpio = 0; gpio < dev->gpio_chip.ngpio; gpio++) {
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int irq = gpio + dev->irq_base;
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irq_set_chip_data(irq, dev);
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irq_set_chip_and_handler(irq, &adp5588_irq_chip,
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handle_level_irq);
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irq_set_nested_thread(irq, 1);
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irq_modify_status(irq, IRQ_NOREQUEST, IRQ_NOPROBE);
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}
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ret = request_threaded_irq(client->irq,
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NULL,
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adp5588_irq_handler,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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dev_name(&client->dev), dev);
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if (ret) {
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dev_err(&client->dev, "failed to request irq %d\n",
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client->irq);
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goto out;
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}
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dev->gpio_chip.to_irq = adp5588_gpio_to_irq;
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adp5588_gpio_write(client, CFG,
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ADP5588_AUTO_INC | ADP5588_INT_CFG | ADP5588_GPI_INT);
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return 0;
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out:
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dev->irq_base = 0;
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return ret;
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}
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static void adp5588_irq_teardown(struct adp5588_gpio *dev)
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{
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if (dev->irq_base)
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free_irq(dev->client->irq, dev);
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}
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#else
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static int adp5588_irq_setup(struct adp5588_gpio *dev)
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{
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struct i2c_client *client = dev->client;
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dev_warn(&client->dev, "interrupt support not compiled in\n");
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return 0;
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}
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static void adp5588_irq_teardown(struct adp5588_gpio *dev)
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{
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}
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#endif /* CONFIG_GPIO_ADP5588_IRQ */
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static int adp5588_gpio_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct adp5588_gpio_platform_data *pdata =
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dev_get_platdata(&client->dev);
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struct adp5588_gpio *dev;
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struct gpio_chip *gc;
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int ret, i, revid;
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if (!pdata) {
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dev_err(&client->dev, "missing platform data\n");
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return -ENODEV;
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}
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_BYTE_DATA)) {
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dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
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return -EIO;
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}
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dev = devm_kzalloc(&client->dev, sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return -ENOMEM;
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dev->client = client;
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gc = &dev->gpio_chip;
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gc->direction_input = adp5588_gpio_direction_input;
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gc->direction_output = adp5588_gpio_direction_output;
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gc->get = adp5588_gpio_get_value;
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gc->set = adp5588_gpio_set_value;
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gc->can_sleep = true;
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gc->base = pdata->gpio_start;
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gc->ngpio = ADP5588_MAXGPIO;
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gc->label = client->name;
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gc->owner = THIS_MODULE;
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gc->names = pdata->names;
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mutex_init(&dev->lock);
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ret = adp5588_gpio_read(dev->client, DEV_ID);
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if (ret < 0)
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goto err;
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revid = ret & ADP5588_DEVICE_ID_MASK;
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for (i = 0, ret = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
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dev->dat_out[i] = adp5588_gpio_read(client, GPIO_DAT_OUT1 + i);
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dev->dir[i] = adp5588_gpio_read(client, GPIO_DIR1 + i);
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ret |= adp5588_gpio_write(client, KP_GPIO1 + i, 0);
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ret |= adp5588_gpio_write(client, GPIO_PULL1 + i,
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(pdata->pullup_dis_mask >> (8 * i)) & 0xFF);
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ret |= adp5588_gpio_write(client, GPIO_INT_EN1 + i, 0);
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if (ret)
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goto err;
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}
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if (pdata->irq_base) {
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if (WA_DELAYED_READOUT_REVID(revid)) {
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dev_warn(&client->dev, "GPIO int not supported\n");
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} else {
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ret = adp5588_irq_setup(dev);
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if (ret)
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goto err;
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}
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}
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ret = devm_gpiochip_add_data(&client->dev, &dev->gpio_chip, dev);
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if (ret)
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goto err_irq;
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dev_info(&client->dev, "IRQ Base: %d Rev.: %d\n",
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pdata->irq_base, revid);
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if (pdata->setup) {
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ret = pdata->setup(client, gc->base, gc->ngpio, pdata->context);
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if (ret < 0)
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dev_warn(&client->dev, "setup failed, %d\n", ret);
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}
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i2c_set_clientdata(client, dev);
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return 0;
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err_irq:
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adp5588_irq_teardown(dev);
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err:
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return ret;
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}
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static int adp5588_gpio_remove(struct i2c_client *client)
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{
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struct adp5588_gpio_platform_data *pdata =
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dev_get_platdata(&client->dev);
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struct adp5588_gpio *dev = i2c_get_clientdata(client);
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int ret;
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if (pdata->teardown) {
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ret = pdata->teardown(client,
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dev->gpio_chip.base, dev->gpio_chip.ngpio,
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pdata->context);
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if (ret < 0) {
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dev_err(&client->dev, "teardown failed %d\n", ret);
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return ret;
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}
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}
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if (dev->irq_base)
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free_irq(dev->client->irq, dev);
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return 0;
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}
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static const struct i2c_device_id adp5588_gpio_id[] = {
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{DRV_NAME, 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, adp5588_gpio_id);
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static struct i2c_driver adp5588_gpio_driver = {
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.driver = {
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.name = DRV_NAME,
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},
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.probe = adp5588_gpio_probe,
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.remove = adp5588_gpio_remove,
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.id_table = adp5588_gpio_id,
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};
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module_i2c_driver(adp5588_gpio_driver);
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MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
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MODULE_DESCRIPTION("GPIO ADP5588 Driver");
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MODULE_LICENSE("GPL");
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