An adapter type parameter is now mandatory. Please read the file
Documentation/i2c/busses/i2c-parport.rst for details.
- Another driver exists, named i2c-parport-light, which doesn't depend
- on the parport driver. This is meant for embedded systems. Don't say
- Y here if you intend to say Y or M there.
-
This support is also available as a module. If so, the module
will be called i2c-parport.
-config I2C_PARPORT_LIGHT
- tristate "Parallel port adapter (light)"
- select I2C_ALGOBIT
- select I2C_SMBUS
- help
- This supports parallel port I2C adapters such as the ones made by
- Philips or Velleman, Analog Devices evaluation boards, and more.
- Basically any adapter using the parallel port as an I2C bus with
- no extra chipset is supported by this driver, or could be.
-
- This driver is a light version of i2c-parport. It doesn't depend
- on the parport driver, and uses direct I/O access instead. This
- might be preferred on embedded systems where wasting memory for
- the clean but heavy parport handling is not an option. The
- drawback is a reduced portability and the impossibility to
- daisy-chain other parallel port devices.
-
- Don't say Y here if you said Y or M to i2c-parport. Saying M to
- both is possible but both modules should not be loaded at the same
- time.
-
- This support is also available as a module. If so, the module
- will be called i2c-parport-light.
-
config I2C_ROBOTFUZZ_OSIF
tristate "RobotFuzz Open Source InterFace USB adapter"
depends on USB
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* ------------------------------------------------------------------------ *
- * i2c-parport-light.c I2C bus over parallel port *
- * ------------------------------------------------------------------------ *
- Copyright (C) 2003-2010 Jean Delvare <jdelvare@suse.de>
-
- Based on older i2c-velleman.c driver
- Copyright (C) 1995-2000 Simon G. Vogl
- With some changes from:
- Frodo Looijaard <frodol@dds.nl>
- Kyösti Mälkki <kmalkki@cc.hut.fi>
-
- * ------------------------------------------------------------------------ */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#include <linux/platform_device.h>
-#include <linux/ioport.h>
-#include <linux/i2c.h>
-#include <linux/i2c-algo-bit.h>
-#include <linux/i2c-smbus.h>
-#include <linux/io.h>
-#include "i2c-parport.h"
-
-#define DEFAULT_BASE 0x378
-#define DRVNAME "i2c-parport-light"
-
-static struct platform_device *pdev;
-
-static u16 base;
-module_param_hw(base, ushort, ioport, 0);
-MODULE_PARM_DESC(base, "Base I/O address");
-
-static int irq;
-module_param_hw(irq, int, irq, 0);
-MODULE_PARM_DESC(irq, "IRQ (optional)");
-
-/* ----- Low-level parallel port access ----------------------------------- */
-
-static inline void port_write(unsigned char p, unsigned char d)
-{
- outb(d, base+p);
-}
-
-static inline unsigned char port_read(unsigned char p)
-{
- return inb(base+p);
-}
-
-/* ----- Unified line operation functions --------------------------------- */
-
-static inline void line_set(int state, const struct lineop *op)
-{
- u8 oldval = port_read(op->port);
-
- /* Touch only the bit(s) needed */
- if ((op->inverted && !state) || (!op->inverted && state))
- port_write(op->port, oldval | op->val);
- else
- port_write(op->port, oldval & ~op->val);
-}
-
-static inline int line_get(const struct lineop *op)
-{
- u8 oldval = port_read(op->port);
-
- return ((op->inverted && (oldval & op->val) != op->val)
- || (!op->inverted && (oldval & op->val) == op->val));
-}
-
-/* ----- I2C algorithm call-back functions and structures ----------------- */
-
-static void parport_setscl(void *data, int state)
-{
- line_set(state, &adapter_parm[type].setscl);
-}
-
-static void parport_setsda(void *data, int state)
-{
- line_set(state, &adapter_parm[type].setsda);
-}
-
-static int parport_getscl(void *data)
-{
- return line_get(&adapter_parm[type].getscl);
-}
-
-static int parport_getsda(void *data)
-{
- return line_get(&adapter_parm[type].getsda);
-}
-
-/* Encapsulate the functions above in the correct structure
- Note that getscl will be set to NULL by the attaching code for adapters
- that cannot read SCL back */
-static struct i2c_algo_bit_data parport_algo_data = {
- .setsda = parport_setsda,
- .setscl = parport_setscl,
- .getsda = parport_getsda,
- .getscl = parport_getscl,
- .udelay = 50,
- .timeout = HZ,
-};
-
-/* ----- Driver registration ---------------------------------------------- */
-
-static struct i2c_adapter parport_adapter = {
- .owner = THIS_MODULE,
- .class = I2C_CLASS_HWMON,
- .algo_data = &parport_algo_data,
- .name = "Parallel port adapter (light)",
-};
-
-/* SMBus alert support */
-static struct i2c_smbus_alert_setup alert_data = {
-};
-static struct i2c_client *ara;
-static struct lineop parport_ctrl_irq = {
- .val = (1 << 4),
- .port = PORT_CTRL,
-};
-
-static int i2c_parport_probe(struct platform_device *pdev)
-{
- int err;
-
- /* Reset hardware to a sane state (SCL and SDA high) */
- parport_setsda(NULL, 1);
- parport_setscl(NULL, 1);
- /* Other init if needed (power on...) */
- if (adapter_parm[type].init.val) {
- line_set(1, &adapter_parm[type].init);
- /* Give powered devices some time to settle */
- msleep(100);
- }
-
- parport_adapter.dev.parent = &pdev->dev;
- err = i2c_bit_add_bus(&parport_adapter);
- if (err) {
- dev_err(&pdev->dev, "Unable to register with I2C\n");
- return err;
- }
-
- /* Setup SMBus alert if supported */
- if (adapter_parm[type].smbus_alert && irq) {
- alert_data.irq = irq;
- ara = i2c_setup_smbus_alert(&parport_adapter, &alert_data);
- if (ara)
- line_set(1, &parport_ctrl_irq);
- else
- dev_warn(&pdev->dev, "Failed to register ARA client\n");
- }
-
- return 0;
-}
-
-static int i2c_parport_remove(struct platform_device *pdev)
-{
- if (ara) {
- line_set(0, &parport_ctrl_irq);
- i2c_unregister_device(ara);
- ara = NULL;
- }
- i2c_del_adapter(&parport_adapter);
-
- /* Un-init if needed (power off...) */
- if (adapter_parm[type].init.val)
- line_set(0, &adapter_parm[type].init);
-
- return 0;
-}
-
-static struct platform_driver i2c_parport_driver = {
- .driver = {
- .name = DRVNAME,
- },
- .probe = i2c_parport_probe,
- .remove = i2c_parport_remove,
-};
-
-static int __init i2c_parport_device_add(u16 address)
-{
- int err;
-
- pdev = platform_device_alloc(DRVNAME, -1);
- if (!pdev) {
- err = -ENOMEM;
- printk(KERN_ERR DRVNAME ": Device allocation failed\n");
- goto exit;
- }
-
- err = platform_device_add(pdev);
- if (err) {
- printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
- err);
- goto exit_device_put;
- }
-
- return 0;
-
-exit_device_put:
- platform_device_put(pdev);
-exit:
- return err;
-}
-
-static int __init i2c_parport_init(void)
-{
- int err;
-
- if (type < 0) {
- printk(KERN_ERR DRVNAME ": adapter type unspecified\n");
- return -ENODEV;
- }
-
- if (type >= ARRAY_SIZE(adapter_parm)) {
- printk(KERN_ERR DRVNAME ": invalid type (%d)\n", type);
- return -ENODEV;
- }
-
- if (base == 0) {
- pr_info(DRVNAME ": using default base 0x%x\n", DEFAULT_BASE);
- base = DEFAULT_BASE;
- }
-
- if (!request_region(base, 3, DRVNAME))
- return -EBUSY;
-
- if (irq != 0)
- pr_info(DRVNAME ": using irq %d\n", irq);
-
- if (!adapter_parm[type].getscl.val)
- parport_algo_data.getscl = NULL;
-
- /* Sets global pdev as a side effect */
- err = i2c_parport_device_add(base);
- if (err)
- goto exit_release;
-
- err = platform_driver_register(&i2c_parport_driver);
- if (err)
- goto exit_device;
-
- return 0;
-
-exit_device:
- platform_device_unregister(pdev);
-exit_release:
- release_region(base, 3);
- return err;
-}
-
-static void __exit i2c_parport_exit(void)
-{
- platform_driver_unregister(&i2c_parport_driver);
- platform_device_unregister(pdev);
- release_region(base, 3);
-}
-
-MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
-MODULE_DESCRIPTION("I2C bus over parallel port (light)");
-MODULE_LICENSE("GPL");
-
-module_init(i2c_parport_init);
-module_exit(i2c_parport_exit);
projects / platform / kernel / linux-rpi.git / commitdiff