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path: root/drivers/i2c/busses/i2c-parport-light.c
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Diffstat (limited to 'drivers/i2c/busses/i2c-parport-light.c')
-rw-r--r--drivers/i2c/busses/i2c-parport-light.c185
1 files changed, 146 insertions, 39 deletions
diff --git a/drivers/i2c/busses/i2c-parport-light.c b/drivers/i2c/busses/i2c-parport-light.c
index 3e5eba9fcac..62f55fe624c 100644
--- a/drivers/i2c/busses/i2c-parport-light.c
+++ b/drivers/i2c/busses/i2c-parport-light.c
@@ -1,14 +1,14 @@
/* ------------------------------------------------------------------------ *
- * i2c-parport.c I2C bus over parallel port *
+ * i2c-parport-light.c I2C bus over parallel port *
* ------------------------------------------------------------------------ *
- Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org>
-
+ 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>
-
+ 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
@@ -27,18 +27,28 @@
#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 <asm/io.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(base, ushort, 0);
MODULE_PARM_DESC(base, "Base I/O address");
+static int irq;
+module_param(irq, int, 0);
+MODULE_PARM_DESC(irq, "IRQ (optional)");
+
/* ----- Low-level parallel port access ----------------------------------- */
static inline void port_write(unsigned char p, unsigned char d)
@@ -103,70 +113,167 @@ static struct i2c_algo_bit_data parport_algo_data = {
.getsda = parport_getsda,
.getscl = parport_getscl,
.udelay = 50,
- .mdelay = 50,
.timeout = HZ,
-};
+};
-/* ----- I2c structure ---------------------------------------------------- */
+/* ----- Driver registration ---------------------------------------------- */
static struct i2c_adapter parport_adapter = {
.owner = THIS_MODULE,
.class = I2C_CLASS_HWMON,
- .id = I2C_HW_B_LP,
.algo_data = &parport_algo_data,
.name = "Parallel port adapter (light)",
};
-/* ----- Module loading, unloading and information ------------------------ */
+/* SMBus alert support */
+static struct i2c_smbus_alert_setup alert_data = {
+ .alert_edge_triggered = 1,
+};
+static struct i2c_client *ara;
+static struct lineop parport_ctrl_irq = {
+ .val = (1 << 4),
+ .port = PORT_CTRL,
+};
-static int __init i2c_parport_init(void)
+static int i2c_parport_probe(struct platform_device *pdev)
{
- 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;
+ 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)
+ if (adapter_parm[type].init.val) {
line_set(1, &adapter_parm[type].init);
+ /* Give powered devices some time to settle */
+ msleep(100);
+ }
- 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;
+ 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 void __exit i2c_parport_exit(void)
+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);
- i2c_bit_del_bus(&parport_adapter);
+ return 0;
+}
+
+static struct platform_driver i2c_parport_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .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 <khali@linux-fr.org>");
+MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
MODULE_DESCRIPTION("I2C bus over parallel port (light)");
MODULE_LICENSE("GPL");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-13 06:31:34 +0000