This support is also available as a module. If so, the module
will be called i2c-philips-par.
+config I2C_PARPORT
+ tristate "Parallel port adapter"
+ depends on I2C_ALGOBIT && PARPORT
+ 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 replacement for (and was inspired by) an older
+ driver named i2c-philips-par. The new driver supports more devices,
+ and makes it easier to add support for new devices.
+
+ 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)"
+ depends on I2C_ALGOBIT
+ 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 prefered 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
+ dasiy-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_PIIX4
tristate "Intel PIIX4"
depends on I2C && PCI && EXPERIMENTAL && !64BIT
obj-$(CONFIG_I2C_KEYWEST) += i2c-keywest.o
obj-$(CONFIG_I2C_NFORCE2) += i2c-nforce2.o
obj-$(CONFIG_I2C_PHILIPSPAR) += i2c-philips-par.o
+obj-$(CONFIG_I2C_PARPORT) += i2c-parport.o
+obj-$(CONFIG_I2C_PARPORT_LIGHT) += i2c-parport-light.o
obj-$(CONFIG_I2C_PIIX4) += i2c-piix4.o
obj-$(CONFIG_I2C_PROSAVAGE) += i2c-prosavage.o
obj-$(CONFIG_I2C_RPXLITE) += i2c-rpx.o
--- /dev/null
+/* ------------------------------------------------------------------------ *
+ * i2c-parport.c I2C bus over parallel port *
+ * ------------------------------------------------------------------------ *
+ Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org>
+
+ 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>
+
+ 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/module.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+#include <asm/io.h>
+#include "i2c-parport.h"
+
+#define DEFAULT_BASE 0x378
+
+static int base;
+MODULE_PARM(base, "i");
+MODULE_PARM_DESC(base, "Base I/O address");
+
+/* ----- 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,
+ .mdelay = 50,
+ .timeout = HZ,
+};
+
+/* ----- I2c structure ---------------------------------------------------- */
+
+static struct i2c_adapter parport_adapter = {
+ .owner = THIS_MODULE,
+ .class = I2C_ADAP_CLASS_SMBUS,
+ .id = I2C_HW_B_LP,
+ .algo_data = &parport_algo_data,
+ .name = "Parallel port adapter (light)",
+};
+
+/* ----- Module loading, unloading and information ------------------------ */
+
+static int __init i2c_parport_init(void)
+{
+ int type_count;
+
+ type_count = sizeof(adapter_parm)/sizeof(struct adapter_parm);
+ if (type < 0 || type >= type_count) {
+ printk(KERN_WARNING "i2c-parport: invalid type (%d)\n", type);
+ type = 0;
+ }
+
+ if (base == 0) {
+ printk(KERN_INFO "i2c-parport: using default base 0x%x\n", DEFAULT_BASE);
+ base = DEFAULT_BASE;
+ }
+
+ if (!request_region(base, 3, "i2c-parport"))
+ return -ENODEV;
+
+ if (!adapter_parm[type].getscl.val)
+ parport_algo_data.getscl = NULL;
+
+ /* 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);
+
+ if (i2c_bit_add_bus(&parport_adapter) < 0) {
+ printk(KERN_ERR "i2c-parport: Unable to register with I2C\n");
+ release_region(base, 3);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static void __exit i2c_parport_exit(void)
+{
+ /* Un-init if needed (power off...) */
+ if (adapter_parm[type].init.val)
+ line_set(0, &adapter_parm[type].init);
+
+ i2c_bit_del_bus(&parport_adapter);
+ release_region(base, 3);
+}
+
+MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
+MODULE_DESCRIPTION("I2C bus over parallel port (light)");
+MODULE_LICENSE("GPL");
+
+module_init(i2c_parport_init);
+module_exit(i2c_parport_exit);
--- /dev/null
+/* ------------------------------------------------------------------------ *
+ * i2c-parport.c I2C bus over parallel port *
+ * ------------------------------------------------------------------------ *
+ Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org>
+
+ Based on older i2c-philips-par.c driver
+ Copyright (C) 1995-2000 Simon G. Vogl
+ With some changes from:
+ Frodo Looijaard <frodol@dds.nl>
+ Kyösti Mälkki <kmalkki@cc.hut.fi>
+
+ 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/module.h>
+#include <linux/init.h>
+#include <linux/parport.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+#include "i2c-parport.h"
+
+/* ----- Device list ------------------------------------------------------ */
+
+struct i2c_par {
+ struct pardevice *pdev;
+ struct i2c_adapter adapter;
+ struct i2c_algo_bit_data algo_data;
+ struct i2c_par *next;
+};
+
+static struct i2c_par *adapter_list;
+
+/* ----- Low-level parallel port access ----------------------------------- */
+
+static void port_write_data(struct parport *p, unsigned char d)
+{
+ parport_write_data(p, d);
+}
+
+static void port_write_control(struct parport *p, unsigned char d)
+{
+ parport_write_control(p, d);
+}
+
+static unsigned char port_read_data(struct parport *p)
+{
+ return parport_read_data(p);
+}
+
+static unsigned char port_read_status(struct parport *p)
+{
+ return parport_read_status(p);
+}
+
+static unsigned char port_read_control(struct parport *p)
+{
+ return parport_read_control(p);
+}
+
+static void (*port_write[])(struct parport *, unsigned char) = {
+ port_write_data,
+ NULL,
+ port_write_control,
+};
+
+static unsigned char (*port_read[])(struct parport *) = {
+ port_read_data,
+ port_read_status,
+ port_read_control,
+};
+
+/* ----- Unified line operation functions --------------------------------- */
+
+static inline void line_set(struct parport *data, int state,
+ const struct lineop *op)
+{
+ u8 oldval = port_read[op->port](data);
+
+ /* Touch only the bit(s) needed */
+ if ((op->inverted && !state) || (!op->inverted && state))
+ port_write[op->port](data, oldval | op->val);
+ else
+ port_write[op->port](data, oldval & ~op->val);
+}
+
+static inline int line_get(struct parport *data,
+ const struct lineop *op)
+{
+ u8 oldval = port_read[op->port](data);
+
+ 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((struct parport *) data, state, &adapter_parm[type].setscl);
+}
+
+static void parport_setsda(void *data, int state)
+{
+ line_set((struct parport *) data, state, &adapter_parm[type].setsda);
+}
+
+static int parport_getscl(void *data)
+{
+ return line_get((struct parport *) data, &adapter_parm[type].getscl);
+}
+
+static int parport_getsda(void *data)
+{
+ return line_get((struct parport *) data, &adapter_parm[type].getsda);
+}
+
+/* Encapsulate the functions above in the correct structure.
+ Note that this is only a template, from which the real structures are
+ copied. The attaching code will set getscl to NULL for adapters that
+ cannot read SCL back, and will also make the the data field point to
+ the parallel port structure. */
+static struct i2c_algo_bit_data parport_algo_data = {
+ .setsda = parport_setsda,
+ .setscl = parport_setscl,
+ .getsda = parport_getsda,
+ .getscl = parport_getscl,
+ .udelay = 60,
+ .mdelay = 60,
+ .timeout = HZ,
+};
+
+/* ----- I2c and parallel port call-back functions and structures --------- */
+
+static struct i2c_adapter parport_adapter = {
+ .owner = THIS_MODULE,
+ .class = I2C_ADAP_CLASS_SMBUS,
+ .id = I2C_HW_B_LP,
+ .name = "Parallel port adapter",
+};
+
+static void i2c_parport_attach (struct parport *port)
+{
+ struct i2c_par *adapter;
+
+ adapter = kmalloc(sizeof(struct i2c_par), GFP_KERNEL);
+ if (adapter == NULL) {
+ printk(KERN_ERR "i2c-parport: Failed to kmalloc\n");
+ return;
+ }
+ memset(adapter, 0x00, sizeof(struct i2c_par));
+
+ printk(KERN_DEBUG "i2c-parport: attaching to %s\n", port->name);
+ adapter->pdev = parport_register_device(port, "i2c-parport",
+ NULL, NULL, NULL, PARPORT_FLAG_EXCL, NULL);
+ if (!adapter->pdev) {
+ printk(KERN_ERR "i2c-parport: Unable to register with parport\n");
+ goto ERROR0;
+ }
+
+ /* Fill the rest of the structure */
+ adapter->adapter = parport_adapter;
+ adapter->algo_data = parport_algo_data;
+ if (!adapter_parm[type].getscl.val)
+ adapter->algo_data.getscl = NULL;
+ adapter->algo_data.data = port;
+ adapter->adapter.algo_data = &adapter->algo_data;
+
+ if (parport_claim_or_block(adapter->pdev) < 0) {
+ printk(KERN_ERR "i2c-parport: Could not claim parallel port\n");
+ goto ERROR1;
+ }
+
+ /* Reset hardware to a sane state (SCL and SDA high) */
+ parport_setsda(port, 1);
+ parport_setscl(port, 1);
+ /* Other init if needed (power on...) */
+ if (adapter_parm[type].init.val)
+ line_set(port, 1, &adapter_parm[type].init);
+
+ parport_release(adapter->pdev);
+
+ if (i2c_bit_add_bus(&adapter->adapter) < 0) {
+ printk(KERN_ERR "i2c-parport: Unable to register with I2C\n");
+ goto ERROR1;
+ }
+
+ /* Add the new adapter to the list */
+ adapter->next = adapter_list;
+ adapter_list = adapter;
+ return;
+
+ERROR1:
+ parport_unregister_device(adapter->pdev);
+ERROR0:
+ kfree(adapter);
+}
+
+static void i2c_parport_detach (struct parport *port)
+{
+ struct i2c_par *adapter, *prev;
+
+ /* Walk the list */
+ for (prev = NULL, adapter = adapter_list; adapter;
+ prev = adapter, adapter = adapter->next) {
+ if (adapter->pdev->port == port) {
+ /* Un-init if needed (power off...) */
+ if (adapter_parm[type].init.val)
+ line_set(port, 0, &adapter_parm[type].init);
+
+ i2c_bit_del_bus(&adapter->adapter);
+ parport_unregister_device(adapter->pdev);
+ if (prev)
+ prev->next = adapter->next;
+ else
+ adapter_list = adapter->next;
+ kfree(adapter);
+ return;
+ }
+ }
+}
+
+static struct parport_driver i2c_driver = {
+ .name = "i2c-parport",
+ .attach = i2c_parport_attach,
+ .detach = i2c_parport_detach,
+};
+
+/* ----- Module loading, unloading and information ------------------------ */
+
+static int __init i2c_parport_init(void)
+{
+ int type_count;
+
+ type_count = sizeof(adapter_parm)/sizeof(struct adapter_parm);
+ if (type < 0 || type >= type_count) {
+ printk(KERN_WARNING "i2c-parport: invalid type (%d)\n", type);
+ type = 0;
+ }
+
+ return parport_register_driver(&i2c_driver);
+}
+
+static void __exit i2c_parport_exit(void)
+{
+ parport_unregister_driver(&i2c_driver);
+}
+
+MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
+MODULE_DESCRIPTION("I2C bus over parallel port");
+MODULE_LICENSE("GPL");
+
+module_init(i2c_parport_init);
+module_exit(i2c_parport_exit);
--- /dev/null
+/* ------------------------------------------------------------------------ *
+ * i2c-parport.h I2C bus over parallel port *
+ * ------------------------------------------------------------------------ *
+ Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org>
+
+ 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.
+ * ------------------------------------------------------------------------ */
+
+#ifdef DATA
+#undef DATA
+#endif
+
+#define DATA 0
+#define STAT 1
+#define CTRL 2
+
+struct lineop {
+ u8 val;
+ u8 port;
+ u8 inverted;
+};
+
+struct adapter_parm {
+ struct lineop setsda;
+ struct lineop setscl;
+ struct lineop getsda;
+ struct lineop getscl;
+ struct lineop init;
+};
+
+static struct adapter_parm adapter_parm[] = {
+ /* type 0: Philips adapter */
+ {
+ .setsda = { 0x80, DATA, 1 },
+ .setscl = { 0x08, CTRL, 0 },
+ .getsda = { 0x80, STAT, 0 },
+ .getscl = { 0x08, STAT, 0 },
+ },
+ /* type 1: home brew teletext adapter */
+ {
+ .setsda = { 0x02, DATA, 0 },
+ .setscl = { 0x01, DATA, 0 },
+ .getsda = { 0x80, STAT, 1 },
+ },
+ /* type 2: Velleman K8000 adapter */
+ {
+ .setsda = { 0x02, CTRL, 1 },
+ .setscl = { 0x08, CTRL, 1 },
+ .getsda = { 0x10, STAT, 0 },
+ },
+ /* type 3: ELV adapter */
+ {
+ .setsda = { 0x02, DATA, 1 },
+ .setscl = { 0x01, DATA, 1 },
+ .getsda = { 0x40, STAT, 1 },
+ .getscl = { 0x08, STAT, 1 },
+ },
+ /* type 4: ADM 1032 evaluation board */
+ {
+ .setsda = { 0x02, DATA, 1 },
+ .setscl = { 0x01, DATA, 1 },
+ .getsda = { 0x10, STAT, 1 },
+ .init = { 0xf0, DATA, 0 },
+ },
+};
+
+static int type;
+MODULE_PARM(type, "i");
+MODULE_PARM_DESC(type,
+ "Type of adapter:\n"
+ " 0 = Philips adapter\n"
+ " 1 = home brew teletext adapter\n"
+ " 2 = Velleman K8000 adapter\n"
+ " 3 = ELV adapter\n"
+ " 4 = ADM 1032 evalulation board\n");
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