--- /dev/null
+--- /dev/null
++++ b/drivers/gpio/gw_i2c_pld.c
+@@ -0,0 +1,370 @@
++/*
++ * Gateworks I2C PLD GPIO expander
++ *
++ * Copyright (C) 2009 Gateworks Corporation
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
++ */
++
++#include <linux/kernel.h>
++#include <linux/slab.h>
++#include <linux/i2c.h>
++#include <linux/i2c/gw_i2c_pld.h>
++#include <asm/gpio.h>
++
++static const struct i2c_device_id gw_i2c_pld_id[] = {
++ { "gw_i2c_pld", 8 },
++ { }
++};
++MODULE_DEVICE_TABLE(i2c, gw_i2c_pld_id);
++
++/*
++ * The Gateworks I2C PLD chip only expose one read and one
++ * write register. Writing a "one" bit (to match the reset state) lets
++ * that pin be used as an input. It is an open-drain model.
++ */
++
++struct gw_i2c_pld {
++ struct gpio_chip chip;
++ struct i2c_client *client;
++ unsigned out; /* software latch */
++};
++
++/*-------------------------------------------------------------------------*/
++
++/*
++ * The Gateworks I2C PLD chip does not properly send the acknowledge bit
++ * thus we cannot use standard i2c_smbus functions. We have recreated
++ * our own here, but we still use the mutex_lock to lock the i2c_bus
++ * as the device still exists on the I2C bus.
++*/
++
++#define PLD_SCL_GPIO 6
++#define PLD_SDA_GPIO 7
++
++#define SCL_LO() gpio_line_set(PLD_SCL_GPIO, IXP4XX_GPIO_LOW)
++#define SCL_HI() gpio_line_set(PLD_SCL_GPIO, IXP4XX_GPIO_HIGH)
++#define SCL_EN() gpio_line_config(PLD_SCL_GPIO, IXP4XX_GPIO_OUT)
++#define SDA_LO() gpio_line_set(PLD_SDA_GPIO, IXP4XX_GPIO_LOW)
++#define SDA_HI() gpio_line_set(PLD_SDA_GPIO, IXP4XX_GPIO_HIGH)
++#define SDA_EN() gpio_line_config(PLD_SDA_GPIO, IXP4XX_GPIO_OUT)
++#define SDA_DIS() gpio_line_config(PLD_SDA_GPIO, IXP4XX_GPIO_IN)
++#define SDA_IN(x) gpio_line_get(PLD_SDA_GPIO, &x);
++
++static int i2c_pld_write_byte(int address, int byte)
++{
++ int i;
++
++ address = (address << 1) & ~0x1;
++
++ SDA_HI();
++ SDA_EN();
++ SCL_EN();
++ SCL_HI();
++ SDA_LO();
++ SCL_LO();
++
++ for (i = 7; i >= 0; i--)
++ {
++ if (address & (1 << i))
++ SDA_HI();
++ else
++ SDA_LO();
++
++ SCL_HI();
++ SCL_LO();
++ }
++
++ SDA_DIS();
++ SCL_HI();
++ SDA_IN(i);
++ SCL_LO();
++ SDA_EN();
++
++ for (i = 7; i >= 0; i--)
++ {
++ if (byte & (1 << i))
++ SDA_HI();
++ else
++ SDA_LO();
++ SCL_HI();
++ SCL_LO();
++ }
++
++ SDA_DIS();
++ SCL_HI();
++ SDA_IN(i);
++ SCL_LO();
++
++ SDA_HI();
++ SDA_EN();
++
++ SDA_LO();
++ SCL_HI();
++ SDA_HI();
++ SCL_LO();
++ SCL_HI();
++
++ return 0;
++}
++
++static unsigned int i2c_pld_read_byte(int address)
++{
++ int i = 0, byte = 0;
++ int bit;
++
++ address = (address << 1) | 0x1;
++
++ SDA_HI();
++ SDA_EN();
++ SCL_EN();
++ SCL_HI();
++ SDA_LO();
++ SCL_LO();
++
++ for (i = 7; i >= 0; i--)
++ {
++ if (address & (1 << i))
++ SDA_HI();
++ else
++ SDA_LO();
++
++ SCL_HI();
++ SCL_LO();
++ }
++
++ SDA_DIS();
++ SCL_HI();
++ SDA_IN(i);
++ SCL_LO();
++ SDA_EN();
++
++ SDA_DIS();
++ for (i = 7; i >= 0; i--)
++ {
++ SCL_HI();
++ SDA_IN(bit);
++ byte |= bit << i;
++ SCL_LO();
++ }
++
++ SDA_LO();
++ SCL_HI();
++ SDA_HI();
++ SCL_LO();
++ SCL_HI();
++
++ return byte;
++}
++
++
++static int gw_i2c_pld_input8(struct gpio_chip *chip, unsigned offset)
++{
++ int ret;
++ struct gw_i2c_pld *gpio = container_of(chip, struct gw_i2c_pld, chip);
++ struct i2c_adapter *adap = gpio->client->adapter;
++
++ if (in_atomic() || irqs_disabled()) {
++ ret = mutex_trylock(&adap->bus_lock);
++ if (!ret)
++ /* I2C activity is ongoing. */
++ return -EAGAIN;
++ } else {
++ mutex_lock_nested(&adap->bus_lock, adap->level);
++ }
++
++ gpio->out |= (1 << offset);
++
++ ret = i2c_pld_write_byte(gpio->client->addr, gpio->out);
++
++ mutex_unlock(&adap->bus_lock);
++
++ return ret;
++}
++
++static int gw_i2c_pld_get8(struct gpio_chip *chip, unsigned offset)
++{
++ int ret;
++ s32 value;
++ struct gw_i2c_pld *gpio = container_of(chip, struct gw_i2c_pld, chip);
++ struct i2c_adapter *adap = gpio->client->adapter;
++
++ if (in_atomic() || irqs_disabled()) {
++ ret = mutex_trylock(&adap->bus_lock);
++ if (!ret)
++ /* I2C activity is ongoing. */
++ return -EAGAIN;
++ } else {
++ mutex_lock_nested(&adap->bus_lock, adap->level);
++ }
++
++ value = i2c_pld_read_byte(gpio->client->addr);
++
++ mutex_unlock(&adap->bus_lock);
++
++ return (value < 0) ? 0 : (value & (1 << offset));
++}
++
++static int gw_i2c_pld_output8(struct gpio_chip *chip, unsigned offset, int value)
++{
++ int ret;
++
++ struct gw_i2c_pld *gpio = container_of(chip, struct gw_i2c_pld, chip);
++ struct i2c_adapter *adap = gpio->client->adapter;
++
++ unsigned bit = 1 << offset;
++
++ if (in_atomic() || irqs_disabled()) {
++ ret = mutex_trylock(&adap->bus_lock);
++ if (!ret)
++ /* I2C activity is ongoing. */
++ return -EAGAIN;
++ } else {
++ mutex_lock_nested(&adap->bus_lock, adap->level);
++ }
++
++
++ if (value)
++ gpio->out |= bit;
++ else
++ gpio->out &= ~bit;
++
++ ret = i2c_pld_write_byte(gpio->client->addr, gpio->out);
++
++ mutex_unlock(&adap->bus_lock);
++
++ return ret;
++}
++
++static void gw_i2c_pld_set8(struct gpio_chip *chip, unsigned offset, int value)
++{
++ gw_i2c_pld_output8(chip, offset, value);
++}
++
++/*-------------------------------------------------------------------------*/
++
++static int gw_i2c_pld_probe(struct i2c_client *client,
++ const struct i2c_device_id *id)
++{
++ struct gw_i2c_pld_platform_data *pdata;
++ struct gw_i2c_pld *gpio;
++ int status;
++
++ pdata = client->dev.platform_data;
++ if (!pdata)
++ return -ENODEV;
++
++ /* Allocate, initialize, and register this gpio_chip. */
++ gpio = kzalloc(sizeof *gpio, GFP_KERNEL);
++ if (!gpio)
++ return -ENOMEM;
++
++ gpio->chip.base = pdata->gpio_base;
++ gpio->chip.can_sleep = 1;
++ gpio->chip.dev = &client->dev;
++ gpio->chip.owner = THIS_MODULE;
++
++ gpio->chip.ngpio = pdata->nr_gpio;
++ gpio->chip.direction_input = gw_i2c_pld_input8;
++ gpio->chip.get = gw_i2c_pld_get8;
++ gpio->chip.direction_output = gw_i2c_pld_output8;
++ gpio->chip.set = gw_i2c_pld_set8;
++
++ gpio->chip.label = client->name;
++
++ gpio->client = client;
++ i2c_set_clientdata(client, gpio);
++
++ gpio->out = 0xFF;
++
++ status = gpiochip_add(&gpio->chip);
++ if (status < 0)
++ goto fail;
++
++ dev_info(&client->dev, "gpios %d..%d on a %s%s\n",
++ gpio->chip.base,
++ gpio->chip.base + gpio->chip.ngpio - 1,
++ client->name,
++ client->irq ? " (irq ignored)" : "");
++
++ /* Let platform code set up the GPIOs and their users.
++ * Now is the first time anyone could use them.
++ */
++ if (pdata->setup) {
++ status = pdata->setup(client,
++ gpio->chip.base, gpio->chip.ngpio,
++ pdata->context);
++ if (status < 0)
++ dev_warn(&client->dev, "setup --> %d\n", status);
++ }
++
++ return 0;
++
++fail:
++ dev_dbg(&client->dev, "probe error %d for '%s'\n",
++ status, client->name);
++ kfree(gpio);
++ return status;
++}
++
++static int gw_i2c_pld_remove(struct i2c_client *client)
++{
++ struct gw_i2c_pld_platform_data *pdata = client->dev.platform_data;
++ struct gw_i2c_pld *gpio = i2c_get_clientdata(client);
++ int status = 0;
++
++ if (pdata->teardown) {
++ 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;
++ }
++ }
++
++ status = gpiochip_remove(&gpio->chip);
++ if (status == 0)
++ kfree(gpio);
++ else
++ dev_err(&client->dev, "%s --> %d\n", "remove", status);
++ return status;
++}
++
++static struct i2c_driver gw_i2c_pld_driver = {
++ .driver = {
++ .name = "gw_i2c_pld",
++ .owner = THIS_MODULE,
++ },
++ .probe = gw_i2c_pld_probe,
++ .remove = gw_i2c_pld_remove,
++ .id_table = gw_i2c_pld_id,
++};
++
++static int __init gw_i2c_pld_init(void)
++{
++ return i2c_add_driver(&gw_i2c_pld_driver);
++}
++module_init(gw_i2c_pld_init);
++
++static void __exit gw_i2c_pld_exit(void)
++{
++ i2c_del_driver(&gw_i2c_pld_driver);
++}
++module_exit(gw_i2c_pld_exit);
++
++MODULE_LICENSE("GPL");
++MODULE_AUTHOR("Chris Lang");
+--- a/drivers/gpio/Kconfig
++++ b/drivers/gpio/Kconfig
+@@ -160,6 +160,14 @@ config GPIO_BT8XX
+
+ If unsure, say N.
+
++config GPIO_GW_I2C_PLD
++ tristate "Gateworks I2C PLD GPIO Expander"
++ depends on I2C
++ help
++ Say yes here to provide access to the Gateworks I2C PLD GPIO
++ Expander. This is used at least on the GW2358-4.
++
++
+ comment "SPI GPIO expanders:"
+
+ config GPIO_MAX7301
+--- a/drivers/gpio/Makefile
++++ b/drivers/gpio/Makefile
+@@ -12,3 +12,4 @@ obj-$(CONFIG_GPIO_PCF857X) += pcf857x.o
+ obj-$(CONFIG_GPIO_TWL4030) += twl4030-gpio.o
+ obj-$(CONFIG_GPIO_XILINX) += xilinx_gpio.o
+ obj-$(CONFIG_GPIO_BT8XX) += bt8xxgpio.o
++obj-$(CONFIG_GPIO_GW_I2C_PLD) += gw_i2c_pld.o
+--- /dev/null
++++ b/include/linux/i2c/gw_i2c_pld.h
+@@ -0,0 +1,20 @@
++#ifndef __LINUX_GW_I2C_PLD_H
++#define __LINUX_GW_I2C_PLD_H
++
++/**
++ * The Gateworks I2C PLD Implements an additional 8 bits of GPIO through the PLD
++ */
++
++struct gw_i2c_pld_platform_data {
++ unsigned gpio_base;
++ unsigned nr_gpio;
++ int (*setup)(struct i2c_client *client,
++ int gpio, unsigned ngpio,
++ void *context);
++ int (*teardown)(struct i2c_client *client,
++ int gpio, unsigned ngpio,
++ void *context);
++ void *context;
++};
++
++#endif /* __LINUX_GW_I2C_PLD_H */
--- /dev/null
+--- a/arch/arm/mach-ixp4xx/cambria-setup.c
++++ b/arch/arm/mach-ixp4xx/cambria-setup.c
+@@ -12,11 +12,14 @@
+ */
+
+ #include <linux/device.h>
++#include <linux/gpio_buttons.h>
+ #include <linux/i2c.h>
+ #include <linux/i2c-gpio.h>
+ #include <linux/i2c/at24.h>
++#include <linux/i2c/gw_i2c_pld.h>
+ #include <linux/if_ether.h>
+ #include <linux/init.h>
++#include <linux/input.h>
+ #include <linux/kernel.h>
+ #include <linux/leds.h>
+ #include <linux/memory.h>
+@@ -323,6 +326,39 @@ static struct platform_device cambria_us
+ },
+ };
+
++static struct gw_i2c_pld_platform_data gw_i2c_pld_data0 = {
++ .gpio_base = 16,
++ .nr_gpio = 8,
++};
++
++static struct gw_i2c_pld_platform_data gw_i2c_pld_data1 = {
++ .gpio_base = 24,
++ .nr_gpio = 2,
++};
++
++
++static struct gpio_button cambria_gpio_buttons[] = {
++ {
++ .desc = "user",
++ .type = EV_KEY,
++ .code = BTN_0,
++ .threshold = 2,
++ .gpio = 25,
++ }
++};
++
++static struct gpio_buttons_platform_data cambria_gpio_buttons_data = {
++ .poll_interval = 500,
++ .nbuttons = 1,
++ .buttons = cambria_gpio_buttons,
++};
++
++static struct platform_device cambria_gpio_buttons_device = {
++ .name = "gpio-buttons",
++ .id = -1,
++ .dev.platform_data = &cambria_gpio_buttons_data,
++};
++
+ static struct platform_device *cambria_devices[] __initdata = {
+ &cambria_i2c_gpio,
+ &cambria_flash,
+@@ -331,6 +367,11 @@ static struct platform_device *cambria_d
+
+ static void __init cambria_gw23xx_setup(void)
+ {
++ cambria_gpio_resources[0].start = (1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (1 << 4) |\
++ (1 << 5) | (1 << 8) | (1 << 9) | (1 << 12);
++ cambria_gpio_resources[0].end = cambria_gpio_resources[0].start;
++
++ platform_device_register(&cambria_gpio);
+ platform_device_register(&cambria_npec_device);
+ platform_device_register(&cambria_npea_device);
+ }
+@@ -377,7 +418,8 @@ static void __init cambria_gw2358_setup(
+ cambria_optional_uart_data[1].membase = (void __iomem *)ioremap(0x53F80000, 0x0fff);
+ cambria_optional_uart_data[1].irq = IRQ_IXP4XX_GPIO4;
+
+- cambria_gpio_resources[0].start = (1 << 14);
++ cambria_gpio_resources[0].start = (1 << 14) | (1 << 16) | (1 << 17) | (1 << 18) |\
++ (1 << 19) | (1 << 20) | (1 << 24) | (1 << 25);
+ cambria_gpio_resources[0].end = cambria_gpio_resources[0].start;
+
+ platform_device_register(&cambria_gpio);
+@@ -391,7 +433,12 @@ static void __init cambria_gw2358_setup(
+
+ platform_device_register(&cambria_pata);
+
++ cambria_gpio_leds[0].gpio = 24;
++ platform_device_register(&cambria_gpio_leds_device);
++
+ platform_device_register(&cambria_latch_leds_device);
++
++ platform_device_register(&cambria_gpio_buttons_device);
+ }
+
+ static struct cambria_board_info cambria_boards[] __initdata = {
+@@ -460,6 +507,14 @@ static struct i2c_board_info __initdata
+ I2C_BOARD_INFO("24c08", 0x51),
+ .platform_data = &cambria_eeprom_info
+ },
++ {
++ I2C_BOARD_INFO("gw_i2c_pld", 0x56),
++ .platform_data = &gw_i2c_pld_data0,
++ },
++ {
++ I2C_BOARD_INFO("gw_i2c_pld", 0x57),
++ .platform_data = &gw_i2c_pld_data1,
++ },
+ };
+
+ static void __init cambria_init(void)
projects / openwrt.git / commitdiff