Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/i2c/busses/i2c-parport-light.c b/drivers/i2c/busses/i2c-parport-light.c
new file mode 100644
index 0000000..cb5e722
--- /dev/null
+++ b/drivers/i2c/busses/i2c-parport-light.c
@@ -0,0 +1,175 @@
+/* ------------------------------------------------------------------------ *
+ * 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/config.h>
+#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 u16 base;
+module_param(base, ushort, 0);
+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_CLASS_HWMON,
+ .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);
