2019-05-20 10:19:02 +03:00
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// SPDX-License-Identifier: GPL-2.0-or-later
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2008-02-05 09:28:24 +03:00
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/*
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2011-06-05 04:38:28 +04:00
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* Driver for pcf857x, pca857x, and pca967x I2C GPIO expanders
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2008-02-05 09:28:24 +03:00
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*
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* Copyright (C) 2007 David Brownell
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*/
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2018-05-24 15:27:28 +03:00
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#include <linux/gpio/driver.h>
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2008-02-05 09:28:24 +03:00
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#include <linux/i2c.h>
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2017-05-22 00:57:26 +03:00
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#include <linux/platform_data/pcf857x.h>
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2012-06-15 06:40:41 +04:00
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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2013-08-20 03:04:52 +04:00
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#include <linux/kernel.h>
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2011-07-03 21:38:09 +04:00
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#include <linux/module.h>
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2013-09-21 22:39:49 +04:00
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#include <linux/of.h>
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#include <linux/of_device.h>
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2013-08-20 03:04:52 +04:00
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#include <linux/slab.h>
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2012-06-15 06:40:41 +04:00
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#include <linux/spinlock.h>
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2008-02-05 09:28:24 +03:00
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2008-04-30 01:11:40 +04:00
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static const struct i2c_device_id pcf857x_id[] = {
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{ "pcf8574", 8 },
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2009-09-19 00:45:47 +04:00
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{ "pcf8574a", 8 },
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2008-04-30 01:11:40 +04:00
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{ "pca8574", 8 },
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{ "pca9670", 8 },
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{ "pca9672", 8 },
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{ "pca9674", 8 },
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{ "pcf8575", 16 },
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{ "pca8575", 16 },
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{ "pca9671", 16 },
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{ "pca9673", 16 },
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{ "pca9675", 16 },
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2008-07-22 01:21:34 +04:00
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{ "max7328", 8 },
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{ "max7329", 8 },
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2008-04-30 01:11:40 +04:00
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, pcf857x_id);
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2013-09-21 22:39:49 +04:00
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#ifdef CONFIG_OF
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static const struct of_device_id pcf857x_of_table[] = {
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{ .compatible = "nxp,pcf8574" },
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{ .compatible = "nxp,pcf8574a" },
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{ .compatible = "nxp,pca8574" },
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{ .compatible = "nxp,pca9670" },
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{ .compatible = "nxp,pca9672" },
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{ .compatible = "nxp,pca9674" },
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{ .compatible = "nxp,pcf8575" },
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{ .compatible = "nxp,pca8575" },
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{ .compatible = "nxp,pca9671" },
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{ .compatible = "nxp,pca9673" },
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{ .compatible = "nxp,pca9675" },
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{ .compatible = "maxim,max7328" },
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{ .compatible = "maxim,max7329" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, pcf857x_of_table);
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#endif
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2008-02-05 09:28:24 +03:00
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/*
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* The pcf857x, pca857x, and pca967x chips only expose one read and one
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* write register. Writing a "one" bit (to match the reset state) lets
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* that pin be used as an input; it's not an open-drain model, but acts
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* a bit like one. This is described as "quasi-bidirectional"; read the
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* chip documentation for details.
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*
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* Many other I2C GPIO expander chips (like the pca953x models) have
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* more complex register models and more conventional circuitry using
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* push/pull drivers. They often use the same 0x20..0x27 addresses as
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* pcf857x parts, making the "legacy" I2C driver model problematic.
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*/
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struct pcf857x {
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struct gpio_chip chip;
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2019-01-09 12:11:24 +03:00
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struct irq_chip irqchip;
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2008-02-05 09:28:24 +03:00
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struct i2c_client *client;
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2008-07-22 01:21:34 +04:00
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struct mutex lock; /* protect 'out' */
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2008-02-05 09:28:24 +03:00
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unsigned out; /* software latch */
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2012-06-15 06:40:41 +04:00
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unsigned status; /* current status */
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2015-06-11 00:01:09 +03:00
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unsigned irq_enabled; /* enabled irqs */
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2012-06-14 08:58:08 +04:00
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int (*write)(struct i2c_client *client, unsigned data);
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int (*read)(struct i2c_client *client);
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2008-02-05 09:28:24 +03:00
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};
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/*-------------------------------------------------------------------------*/
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/* Talk to 8-bit I/O expander */
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2012-06-14 08:58:08 +04:00
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static int i2c_write_le8(struct i2c_client *client, unsigned data)
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2008-02-05 09:28:24 +03:00
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{
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2012-06-14 08:58:08 +04:00
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return i2c_smbus_write_byte(client, data);
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2008-02-05 09:28:24 +03:00
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}
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2012-06-14 08:58:08 +04:00
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static int i2c_read_le8(struct i2c_client *client)
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2008-02-05 09:28:24 +03:00
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{
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2012-06-14 08:58:08 +04:00
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return (int)i2c_smbus_read_byte(client);
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2008-02-05 09:28:24 +03:00
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}
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/* Talk to 16-bit I/O expander */
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2012-06-14 08:58:08 +04:00
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static int i2c_write_le16(struct i2c_client *client, unsigned word)
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2008-02-05 09:28:24 +03:00
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{
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u8 buf[2] = { word & 0xff, word >> 8, };
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int status;
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status = i2c_master_send(client, buf, 2);
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return (status < 0) ? status : 0;
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}
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static int i2c_read_le16(struct i2c_client *client)
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{
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u8 buf[2];
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int status;
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status = i2c_master_recv(client, buf, 2);
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if (status < 0)
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return status;
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return (buf[1] << 8) | buf[0];
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}
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2012-06-14 08:58:08 +04:00
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/*-------------------------------------------------------------------------*/
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static int pcf857x_input(struct gpio_chip *chip, unsigned offset)
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2008-02-05 09:28:24 +03:00
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{
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2015-12-07 13:24:05 +03:00
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struct pcf857x *gpio = gpiochip_get_data(chip);
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2008-07-22 01:21:34 +04:00
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int status;
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2008-02-05 09:28:24 +03:00
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2008-07-22 01:21:34 +04:00
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mutex_lock(&gpio->lock);
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2008-02-05 09:28:24 +03:00
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gpio->out |= (1 << offset);
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2012-06-14 08:58:08 +04:00
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status = gpio->write(gpio->client, gpio->out);
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2008-07-22 01:21:34 +04:00
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mutex_unlock(&gpio->lock);
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return status;
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2008-02-05 09:28:24 +03:00
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}
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2012-06-14 08:58:08 +04:00
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static int pcf857x_get(struct gpio_chip *chip, unsigned offset)
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2008-02-05 09:28:24 +03:00
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{
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2015-12-07 13:24:05 +03:00
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struct pcf857x *gpio = gpiochip_get_data(chip);
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2008-02-05 09:28:24 +03:00
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int value;
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2012-06-14 08:58:08 +04:00
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value = gpio->read(gpio->client);
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2015-12-21 13:32:53 +03:00
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return (value < 0) ? value : !!(value & (1 << offset));
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2008-02-05 09:28:24 +03:00
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}
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2012-06-14 08:58:08 +04:00
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static int pcf857x_output(struct gpio_chip *chip, unsigned offset, int value)
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2008-02-05 09:28:24 +03:00
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{
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2015-12-07 13:24:05 +03:00
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struct pcf857x *gpio = gpiochip_get_data(chip);
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2008-02-05 09:28:24 +03:00
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unsigned bit = 1 << offset;
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2008-07-22 01:21:34 +04:00
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int status;
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2008-02-05 09:28:24 +03:00
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2008-07-22 01:21:34 +04:00
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mutex_lock(&gpio->lock);
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2008-02-05 09:28:24 +03:00
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if (value)
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gpio->out |= bit;
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else
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gpio->out &= ~bit;
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2012-06-14 08:58:08 +04:00
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status = gpio->write(gpio->client, gpio->out);
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2008-07-22 01:21:34 +04:00
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mutex_unlock(&gpio->lock);
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return status;
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2008-02-05 09:28:24 +03:00
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}
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2012-06-14 08:58:08 +04:00
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static void pcf857x_set(struct gpio_chip *chip, unsigned offset, int value)
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2008-02-05 09:28:24 +03:00
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{
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2012-06-14 08:58:08 +04:00
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pcf857x_output(chip, offset, value);
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2008-02-05 09:28:24 +03:00
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}
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/*-------------------------------------------------------------------------*/
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2013-09-04 11:03:01 +04:00
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static irqreturn_t pcf857x_irq(int irq, void *data)
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{
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struct pcf857x *gpio = data;
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2015-06-25 18:18:11 +03:00
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unsigned long change, i, status;
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2013-09-04 11:03:01 +04:00
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status = gpio->read(gpio->client);
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2013-09-04 11:03:03 +04:00
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/*
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* call the interrupt handler iff gpio is used as
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* interrupt source, just to avoid bad irqs
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*/
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2015-06-25 18:18:11 +03:00
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mutex_lock(&gpio->lock);
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2015-06-11 00:01:09 +03:00
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change = (gpio->status ^ status) & gpio->irq_enabled;
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2013-09-04 11:03:01 +04:00
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gpio->status = status;
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2015-06-25 18:18:11 +03:00
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mutex_unlock(&gpio->lock);
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2013-09-04 11:03:01 +04:00
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2015-06-25 18:18:11 +03:00
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for_each_set_bit(i, &change, gpio->chip.ngpio)
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2017-11-07 21:15:47 +03:00
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handle_nested_irq(irq_find_mapping(gpio->chip.irq.domain, i));
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2013-09-04 11:03:01 +04:00
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return IRQ_HANDLED;
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}
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2015-02-05 18:49:09 +03:00
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/*
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* NOP functions
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*/
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static void noop(struct irq_data *data) { }
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static int pcf857x_irq_set_wake(struct irq_data *data, unsigned int on)
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{
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struct pcf857x *gpio = irq_data_get_irq_chip_data(data);
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2015-06-11 00:01:09 +03:00
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2019-02-13 16:14:09 +03:00
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return irq_set_irq_wake(gpio->client->irq, on);
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2015-02-05 18:49:09 +03:00
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}
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2015-06-11 00:01:09 +03:00
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static void pcf857x_irq_enable(struct irq_data *data)
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{
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struct pcf857x *gpio = irq_data_get_irq_chip_data(data);
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gpio->irq_enabled |= (1 << data->hwirq);
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}
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static void pcf857x_irq_disable(struct irq_data *data)
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{
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struct pcf857x *gpio = irq_data_get_irq_chip_data(data);
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gpio->irq_enabled &= ~(1 << data->hwirq);
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}
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static void pcf857x_irq_bus_lock(struct irq_data *data)
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{
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struct pcf857x *gpio = irq_data_get_irq_chip_data(data);
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mutex_lock(&gpio->lock);
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}
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static void pcf857x_irq_bus_sync_unlock(struct irq_data *data)
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{
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struct pcf857x *gpio = irq_data_get_irq_chip_data(data);
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mutex_unlock(&gpio->lock);
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}
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2012-06-15 06:40:41 +04:00
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/*-------------------------------------------------------------------------*/
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2008-04-30 01:11:39 +04:00
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static int pcf857x_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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2008-02-05 09:28:24 +03:00
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{
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2013-09-21 22:39:49 +04:00
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struct pcf857x_platform_data *pdata = dev_get_platdata(&client->dev);
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struct device_node *np = client->dev.of_node;
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2008-02-05 09:28:24 +03:00
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struct pcf857x *gpio;
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2013-09-21 22:39:49 +04:00
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unsigned int n_latch = 0;
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2008-02-05 09:28:24 +03:00
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int status;
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2013-09-21 22:39:49 +04:00
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if (IS_ENABLED(CONFIG_OF) && np)
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of_property_read_u32(np, "lines-initial-states", &n_latch);
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else if (pdata)
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n_latch = pdata->n_latch;
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else
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2009-01-16 00:50:45 +03:00
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dev_dbg(&client->dev, "no platform data\n");
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2008-02-05 09:28:24 +03:00
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/* Allocate, initialize, and register this gpio_chip. */
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2013-03-15 13:16:11 +04:00
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gpio = devm_kzalloc(&client->dev, sizeof(*gpio), GFP_KERNEL);
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2008-02-05 09:28:24 +03:00
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if (!gpio)
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return -ENOMEM;
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2008-07-22 01:21:34 +04:00
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mutex_init(&gpio->lock);
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2012-06-14 08:58:08 +04:00
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gpio->chip.base = pdata ? pdata->gpio_base : -1;
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2013-12-04 17:42:46 +04:00
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gpio->chip.can_sleep = true;
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2015-12-04 17:28:16 +03:00
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gpio->chip.parent = &client->dev;
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2012-06-14 08:58:08 +04:00
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gpio->chip.owner = THIS_MODULE;
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gpio->chip.get = pcf857x_get;
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gpio->chip.set = pcf857x_set;
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gpio->chip.direction_input = pcf857x_input;
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gpio->chip.direction_output = pcf857x_output;
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gpio->chip.ngpio = id->driver_data;
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2008-02-05 09:28:24 +03:00
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/* NOTE: the OnSemi jlc1562b is also largely compatible with
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* these parts, notably for output. It has a low-resolution
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* DAC instead of pin change IRQs; and its inputs can be the
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* result of comparators.
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*/
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/* 8574 addresses are 0x20..0x27; 8574a uses 0x38..0x3f;
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* 9670, 9672, 9764, and 9764a use quite a variety.
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*
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* NOTE: we don't distinguish here between *4 and *4a parts.
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*/
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2008-04-30 01:11:40 +04:00
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if (gpio->chip.ngpio == 8) {
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2012-06-14 08:58:08 +04:00
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gpio->write = i2c_write_le8;
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gpio->read = i2c_read_le8;
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2008-02-05 09:28:24 +03:00
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_BYTE))
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status = -EIO;
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/* fail if there's no chip present */
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else
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status = i2c_smbus_read_byte(client);
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/* '75/'75c addresses are 0x20..0x27, just like the '74;
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* the '75c doesn't have a current source pulling high.
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* 9671, 9673, and 9765 use quite a variety of addresses.
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|
|
*
|
|
|
|
* NOTE: we don't distinguish here between '75 and '75c parts.
|
|
|
|
*/
|
2008-04-30 01:11:40 +04:00
|
|
|
} else if (gpio->chip.ngpio == 16) {
|
2012-06-14 08:58:08 +04:00
|
|
|
gpio->write = i2c_write_le16;
|
|
|
|
gpio->read = i2c_read_le16;
|
2008-02-05 09:28:24 +03:00
|
|
|
|
|
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
|
|
|
|
status = -EIO;
|
|
|
|
|
|
|
|
/* fail if there's no chip present */
|
|
|
|
else
|
|
|
|
status = i2c_read_le16(client);
|
|
|
|
|
2009-01-16 00:50:45 +03:00
|
|
|
} else {
|
|
|
|
dev_dbg(&client->dev, "unsupported number of gpios\n");
|
|
|
|
status = -EINVAL;
|
|
|
|
}
|
2008-02-05 09:28:24 +03:00
|
|
|
|
|
|
|
if (status < 0)
|
|
|
|
goto fail;
|
|
|
|
|
|
|
|
gpio->chip.label = client->name;
|
|
|
|
|
|
|
|
gpio->client = client;
|
|
|
|
i2c_set_clientdata(client, gpio);
|
|
|
|
|
|
|
|
/* NOTE: these chips have strange "quasi-bidirectional" I/O pins.
|
|
|
|
* We can't actually know whether a pin is configured (a) as output
|
|
|
|
* and driving the signal low, or (b) as input and reporting a low
|
|
|
|
* value ... without knowing the last value written since the chip
|
|
|
|
* came out of reset (if any). We can't read the latched output.
|
|
|
|
*
|
|
|
|
* In short, the only reliable solution for setting up pin direction
|
|
|
|
* is to do it explicitly. The setup() method can do that, but it
|
|
|
|
* may cause transient glitching since it can't know the last value
|
|
|
|
* written (some pins may need to be driven low).
|
|
|
|
*
|
2013-09-21 22:39:49 +04:00
|
|
|
* Using n_latch avoids that trouble. When left initialized to zero,
|
|
|
|
* our software copy of the "latch" then matches the chip's all-ones
|
|
|
|
* reset state. Otherwise it flags pins to be driven low.
|
2008-02-05 09:28:24 +03:00
|
|
|
*/
|
2013-09-21 22:39:49 +04:00
|
|
|
gpio->out = ~n_latch;
|
2021-02-17 16:10:00 +03:00
|
|
|
gpio->status = gpio->read(gpio->client);
|
2008-02-05 09:28:24 +03:00
|
|
|
|
2015-02-05 18:49:08 +03:00
|
|
|
/* Enable irqchip if we have an interrupt */
|
|
|
|
if (client->irq) {
|
2020-07-17 17:48:35 +03:00
|
|
|
struct gpio_irq_chip *girq;
|
|
|
|
|
|
|
|
gpio->irqchip.name = "pcf857x";
|
|
|
|
gpio->irqchip.irq_enable = pcf857x_irq_enable;
|
|
|
|
gpio->irqchip.irq_disable = pcf857x_irq_disable;
|
|
|
|
gpio->irqchip.irq_ack = noop;
|
|
|
|
gpio->irqchip.irq_mask = noop;
|
|
|
|
gpio->irqchip.irq_unmask = noop;
|
|
|
|
gpio->irqchip.irq_set_wake = pcf857x_irq_set_wake;
|
|
|
|
gpio->irqchip.irq_bus_lock = pcf857x_irq_bus_lock;
|
|
|
|
gpio->irqchip.irq_bus_sync_unlock = pcf857x_irq_bus_sync_unlock;
|
2015-02-05 18:49:08 +03:00
|
|
|
|
|
|
|
status = devm_request_threaded_irq(&client->dev, client->irq,
|
|
|
|
NULL, pcf857x_irq, IRQF_ONESHOT |
|
|
|
|
IRQF_TRIGGER_FALLING | IRQF_SHARED,
|
|
|
|
dev_name(&client->dev), gpio);
|
|
|
|
if (status)
|
2016-02-22 15:13:28 +03:00
|
|
|
goto fail;
|
2015-02-05 18:49:08 +03:00
|
|
|
|
2020-07-17 17:48:35 +03:00
|
|
|
girq = &gpio->chip.irq;
|
|
|
|
girq->chip = &gpio->irqchip;
|
|
|
|
/* This will let us handle the parent IRQ in the driver */
|
|
|
|
girq->parent_handler = NULL;
|
|
|
|
girq->num_parents = 0;
|
|
|
|
girq->parents = NULL;
|
|
|
|
girq->default_type = IRQ_TYPE_NONE;
|
|
|
|
girq->handler = handle_level_irq;
|
|
|
|
girq->threaded = true;
|
2015-02-05 18:49:08 +03:00
|
|
|
}
|
|
|
|
|
2020-07-17 17:48:35 +03:00
|
|
|
status = devm_gpiochip_add_data(&client->dev, &gpio->chip, gpio);
|
|
|
|
if (status < 0)
|
|
|
|
goto fail;
|
|
|
|
|
2008-02-05 09:28:24 +03:00
|
|
|
/* Let platform code set up the GPIOs and their users.
|
|
|
|
* Now is the first time anyone could use them.
|
|
|
|
*/
|
2010-08-11 05:02:24 +04:00
|
|
|
if (pdata && pdata->setup) {
|
2008-02-05 09:28:24 +03:00
|
|
|
status = pdata->setup(client,
|
|
|
|
gpio->chip.base, gpio->chip.ngpio,
|
|
|
|
pdata->context);
|
|
|
|
if (status < 0)
|
|
|
|
dev_warn(&client->dev, "setup --> %d\n", status);
|
|
|
|
}
|
|
|
|
|
2012-12-06 13:10:28 +04:00
|
|
|
dev_info(&client->dev, "probed\n");
|
|
|
|
|
2008-02-05 09:28:24 +03:00
|
|
|
return 0;
|
|
|
|
|
2015-02-05 18:49:08 +03:00
|
|
|
fail:
|
|
|
|
dev_dbg(&client->dev, "probe error %d for '%s'\n", status,
|
|
|
|
client->name);
|
2014-05-23 09:57:26 +04:00
|
|
|
|
2008-02-05 09:28:24 +03:00
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int pcf857x_remove(struct i2c_client *client)
|
|
|
|
{
|
2013-07-30 12:08:05 +04:00
|
|
|
struct pcf857x_platform_data *pdata = dev_get_platdata(&client->dev);
|
2008-02-05 09:28:24 +03:00
|
|
|
struct pcf857x *gpio = i2c_get_clientdata(client);
|
|
|
|
int status = 0;
|
|
|
|
|
2010-08-11 05:02:24 +04:00
|
|
|
if (pdata && pdata->teardown) {
|
2008-02-05 09:28:24 +03:00
|
|
|
status = pdata->teardown(client,
|
|
|
|
gpio->chip.base, gpio->chip.ngpio,
|
|
|
|
pdata->context);
|
|
|
|
if (status < 0) {
|
|
|
|
dev_err(&client->dev, "%s --> %d\n",
|
|
|
|
"teardown", status);
|
|
|
|
return status;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return status;
|
|
|
|
}
|
|
|
|
|
2016-05-27 09:35:29 +03:00
|
|
|
static void pcf857x_shutdown(struct i2c_client *client)
|
|
|
|
{
|
|
|
|
struct pcf857x *gpio = i2c_get_clientdata(client);
|
|
|
|
|
|
|
|
/* Drive all the I/O lines high */
|
|
|
|
gpio->write(gpio->client, BIT(gpio->chip.ngpio) - 1);
|
|
|
|
}
|
|
|
|
|
2008-02-05 09:28:24 +03:00
|
|
|
static struct i2c_driver pcf857x_driver = {
|
|
|
|
.driver = {
|
|
|
|
.name = "pcf857x",
|
2013-09-21 22:39:49 +04:00
|
|
|
.of_match_table = of_match_ptr(pcf857x_of_table),
|
2008-02-05 09:28:24 +03:00
|
|
|
},
|
|
|
|
.probe = pcf857x_probe,
|
|
|
|
.remove = pcf857x_remove,
|
2016-05-27 09:35:29 +03:00
|
|
|
.shutdown = pcf857x_shutdown,
|
2008-04-30 01:11:40 +04:00
|
|
|
.id_table = pcf857x_id,
|
2008-02-05 09:28:24 +03:00
|
|
|
};
|
|
|
|
|
|
|
|
static int __init pcf857x_init(void)
|
|
|
|
{
|
|
|
|
return i2c_add_driver(&pcf857x_driver);
|
|
|
|
}
|
2008-10-16 09:03:13 +04:00
|
|
|
/* register after i2c postcore initcall and before
|
|
|
|
* subsys initcalls that may rely on these GPIOs
|
|
|
|
*/
|
|
|
|
subsys_initcall(pcf857x_init);
|
2008-02-05 09:28:24 +03:00
|
|
|
|
|
|
|
static void __exit pcf857x_exit(void)
|
|
|
|
{
|
|
|
|
i2c_del_driver(&pcf857x_driver);
|
|
|
|
}
|
|
|
|
module_exit(pcf857x_exit);
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_AUTHOR("David Brownell");
|