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path: root/drivers/i2c/busses/i2c-parport.c
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Diffstat (limited to 'drivers/i2c/busses/i2c-parport.c')
-rw-r--r--drivers/i2c/busses/i2c-parport.c224
1 files changed, 163 insertions, 61 deletions
diff --git a/drivers/i2c/busses/i2c-parport.c b/drivers/i2c/busses/i2c-parport.c
index 81d887869620..3249bbd5eb43 100644
--- a/drivers/i2c/busses/i2c-parport.c
+++ b/drivers/i2c/busses/i2c-parport.c
@@ -1,7 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/* ------------------------------------------------------------------------ *
* i2c-parport.c I2C bus over parallel port *
* ------------------------------------------------------------------------ *
- Copyright (C) 2003-2011 Jean Delvare <khali@linux-fr.org>
+ Copyright (C) 2003-2011 Jean Delvare <jdelvare@suse.de>
Based on older i2c-philips-par.c driver
Copyright (C) 1995-2000 Simon G. Vogl
@@ -9,21 +10,10 @@
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.
* ------------------------------------------------------------------------ */
+#define pr_fmt(fmt) "i2c-parport: " fmt
+
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
@@ -35,7 +25,90 @@
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/mutex.h>
-#include "i2c-parport.h"
+
+#define PORT_DATA 0
+#define PORT_STAT 1
+#define PORT_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;
+ unsigned int smbus_alert:1;
+};
+
+static const struct adapter_parm adapter_parm[] = {
+ /* type 0: Philips adapter */
+ {
+ .setsda = { 0x80, PORT_DATA, 1 },
+ .setscl = { 0x08, PORT_CTRL, 0 },
+ .getsda = { 0x80, PORT_STAT, 0 },
+ .getscl = { 0x08, PORT_STAT, 0 },
+ },
+ /* type 1: home brew teletext adapter */
+ {
+ .setsda = { 0x02, PORT_DATA, 0 },
+ .setscl = { 0x01, PORT_DATA, 0 },
+ .getsda = { 0x80, PORT_STAT, 1 },
+ },
+ /* type 2: Velleman K8000 adapter */
+ {
+ .setsda = { 0x02, PORT_CTRL, 1 },
+ .setscl = { 0x08, PORT_CTRL, 1 },
+ .getsda = { 0x10, PORT_STAT, 0 },
+ },
+ /* type 3: ELV adapter */
+ {
+ .setsda = { 0x02, PORT_DATA, 1 },
+ .setscl = { 0x01, PORT_DATA, 1 },
+ .getsda = { 0x40, PORT_STAT, 1 },
+ .getscl = { 0x08, PORT_STAT, 1 },
+ },
+ /* type 4: ADM1032 evaluation board */
+ {
+ .setsda = { 0x02, PORT_DATA, 1 },
+ .setscl = { 0x01, PORT_DATA, 1 },
+ .getsda = { 0x10, PORT_STAT, 1 },
+ .init = { 0xf0, PORT_DATA, 0 },
+ .smbus_alert = 1,
+ },
+ /* type 5: ADM1025, ADM1030 and ADM1031 evaluation boards */
+ {
+ .setsda = { 0x02, PORT_DATA, 1 },
+ .setscl = { 0x01, PORT_DATA, 1 },
+ .getsda = { 0x10, PORT_STAT, 1 },
+ },
+ /* type 6: Barco LPT->DVI (K5800236) adapter */
+ {
+ .setsda = { 0x02, PORT_DATA, 1 },
+ .setscl = { 0x01, PORT_DATA, 1 },
+ .getsda = { 0x20, PORT_STAT, 0 },
+ .getscl = { 0x40, PORT_STAT, 0 },
+ .init = { 0xfc, PORT_DATA, 0 },
+ },
+ /* type 7: One For All JP1 parallel port adapter */
+ {
+ .setsda = { 0x01, PORT_DATA, 0 },
+ .setscl = { 0x02, PORT_DATA, 0 },
+ .getsda = { 0x80, PORT_STAT, 1 },
+ .init = { 0x04, PORT_DATA, 1 },
+ },
+ /* type 8: VCT-jig */
+ {
+ .setsda = { 0x04, PORT_DATA, 1 },
+ .setscl = { 0x01, PORT_DATA, 1 },
+ .getsda = { 0x40, PORT_STAT, 0 },
+ .getscl = { 0x80, PORT_STAT, 1 },
+ },
+};
/* ----- Device list ------------------------------------------------------ */
@@ -51,6 +124,30 @@ struct i2c_par {
static LIST_HEAD(adapter_list);
static DEFINE_MUTEX(adapter_list_lock);
+#define MAX_DEVICE 4
+static int parport[MAX_DEVICE] = {0, -1, -1, -1};
+module_param_array(parport, int, NULL, 0);
+MODULE_PARM_DESC(parport,
+ "List of parallel ports to bind to, by index.\n"
+ " At most " __stringify(MAX_DEVICE) " devices are supported.\n"
+ " Default is one device connected to parport0.\n"
+);
+
+static int type = -1;
+module_param(type, int, 0);
+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 = ADM1032 evaluation board\n"
+ " 5 = ADM1025, ADM1030 and ADM1031 evaluation boards\n"
+ " 6 = Barco LPT->DVI (K5800236) adapter\n"
+ " 7 = One For All JP1 parallel port adapter\n"
+ " 8 = VCT-jig\n"
+);
+
/* ----- Low-level parallel port access ----------------------------------- */
static void port_write_data(struct parport *p, unsigned char d)
@@ -167,26 +264,51 @@ static void i2c_parport_irq(void *data)
static void i2c_parport_attach(struct parport *port)
{
struct i2c_par *adapter;
+ int i;
+ struct pardev_cb i2c_parport_cb;
- adapter = kzalloc(sizeof(struct i2c_par), GFP_KERNEL);
- if (adapter == NULL) {
- printk(KERN_ERR "i2c-parport: Failed to kzalloc\n");
+ if (type < 0) {
+ pr_warn("adapter type unspecified\n");
+ return;
+ }
+
+ if (type >= ARRAY_SIZE(adapter_parm)) {
+ pr_warn("invalid type (%d)\n", type);
+ return;
+ }
+
+ for (i = 0; i < MAX_DEVICE; i++) {
+ if (parport[i] == -1)
+ continue;
+ if (port->number == parport[i])
+ break;
+ }
+ if (i == MAX_DEVICE) {
+ pr_debug("Not using parport%d.\n", port->number);
return;
}
- pr_debug("i2c-parport: attaching to %s\n", port->name);
+ adapter = kzalloc(sizeof(struct i2c_par), GFP_KERNEL);
+ if (!adapter)
+ return;
+ memset(&i2c_parport_cb, 0, sizeof(i2c_parport_cb));
+ i2c_parport_cb.flags = PARPORT_FLAG_EXCL;
+ i2c_parport_cb.irq_func = i2c_parport_irq;
+ i2c_parport_cb.private = adapter;
+
+ pr_debug("attaching to %s\n", port->name);
parport_disable_irq(port);
- adapter->pdev = parport_register_device(port, "i2c-parport",
- NULL, NULL, i2c_parport_irq, PARPORT_FLAG_EXCL, adapter);
+ adapter->pdev = parport_register_dev_model(port, "i2c-parport",
+ &i2c_parport_cb, i);
if (!adapter->pdev) {
- printk(KERN_ERR "i2c-parport: Unable to register with parport\n");
+ pr_err("Unable to register with parport\n");
goto err_free;
}
/* Fill the rest of the structure */
adapter->adapter.owner = THIS_MODULE;
adapter->adapter.class = I2C_CLASS_HWMON;
- strlcpy(adapter->adapter.name, "Parallel port adapter",
+ strscpy(adapter->adapter.name, "Parallel port adapter",
sizeof(adapter->adapter.name));
adapter->algo_data = parport_algo_data;
/* Slow down if we can't sense SCL */
@@ -199,7 +321,8 @@ static void i2c_parport_attach(struct parport *port)
adapter->adapter.dev.parent = port->physport->dev;
if (parport_claim_or_block(adapter->pdev) < 0) {
- printk(KERN_ERR "i2c-parport: Could not claim parallel port\n");
+ dev_err(&adapter->pdev->dev,
+ "Could not claim parallel port\n");
goto err_unregister;
}
@@ -214,20 +337,23 @@ static void i2c_parport_attach(struct parport *port)
}
if (i2c_bit_add_bus(&adapter->adapter) < 0) {
- printk(KERN_ERR "i2c-parport: Unable to register with I2C\n");
+ dev_err(&adapter->pdev->dev, "Unable to register with I2C\n");
goto err_unregister;
}
/* Setup SMBus alert if supported */
if (adapter_parm[type].smbus_alert) {
- adapter->alert_data.alert_edge_triggered = 1;
- adapter->ara = i2c_setup_smbus_alert(&adapter->adapter,
- &adapter->alert_data);
- if (adapter->ara)
+ struct i2c_client *ara;
+
+ ara = i2c_new_smbus_alert_device(&adapter->adapter,
+ &adapter->alert_data);
+ if (!IS_ERR(ara)) {
+ adapter->ara = ara;
parport_enable_irq(port);
- else
- printk(KERN_WARNING "i2c-parport: Failed to register "
- "ARA client\n");
+ } else {
+ dev_warn(&adapter->pdev->dev,
+ "Failed to register ARA client\n");
+ }
}
/* Add the new adapter to the list */
@@ -271,36 +397,12 @@ static void i2c_parport_detach(struct parport *port)
}
static struct parport_driver i2c_parport_driver = {
- .name = "i2c-parport",
- .attach = i2c_parport_attach,
- .detach = i2c_parport_detach,
+ .name = "i2c-parport",
+ .match_port = i2c_parport_attach,
+ .detach = i2c_parport_detach,
};
+module_parport_driver(i2c_parport_driver);
-/* ----- Module loading, unloading and information ------------------------ */
-
-static int __init i2c_parport_init(void)
-{
- if (type < 0) {
- printk(KERN_WARNING "i2c-parport: adapter type unspecified\n");
- return -ENODEV;
- }
-
- if (type >= ARRAY_SIZE(adapter_parm)) {
- printk(KERN_WARNING "i2c-parport: invalid type (%d)\n", type);
- return -ENODEV;
- }
-
- return parport_register_driver(&i2c_parport_driver);
-}
-
-static void __exit i2c_parport_exit(void)
-{
- parport_unregister_driver(&i2c_parport_driver);
-}
-
-MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
+MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
MODULE_DESCRIPTION("I2C bus over parallel port");
MODULE_LICENSE("GPL");
-
-module_init(i2c_parport_init);
-module_exit(i2c_parport_exit);
generated by cgit (git 2.34.1) at 2025-12-25 23:58:55 +0000