summaryrefslogtreecommitdiff
path: root/ANDROID_3.4.5/drivers/i2c/busses/i2c-parport.c
diff options
context:
space:
mode:
Diffstat (limited to 'ANDROID_3.4.5/drivers/i2c/busses/i2c-parport.c')
-rw-r--r--ANDROID_3.4.5/drivers/i2c/busses/i2c-parport.c306
1 files changed, 0 insertions, 306 deletions
diff --git a/ANDROID_3.4.5/drivers/i2c/busses/i2c-parport.c b/ANDROID_3.4.5/drivers/i2c/busses/i2c-parport.c
deleted file mode 100644
index 24565687..00000000
--- a/ANDROID_3.4.5/drivers/i2c/busses/i2c-parport.c
+++ /dev/null
@@ -1,306 +0,0 @@
-/* ------------------------------------------------------------------------ *
- * i2c-parport.c I2C bus over parallel port *
- * ------------------------------------------------------------------------ *
- Copyright (C) 2003-2011 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/delay.h>
-#include <linux/parport.h>
-#include <linux/i2c.h>
-#include <linux/i2c-algo-bit.h>
-#include <linux/i2c-smbus.h>
-#include <linux/slab.h>
-#include <linux/list.h>
-#include <linux/mutex.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_smbus_alert_setup alert_data;
- struct i2c_client *ara;
- struct list_head node;
-};
-
-static LIST_HEAD(adapter_list);
-static DEFINE_MUTEX(adapter_list_lock);
-
-/* ----- 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 (* const port_write[])(struct parport *, unsigned char) = {
- port_write_data,
- NULL,
- port_write_control,
-};
-
-static unsigned char (* const 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 data field point to
- the parallel port structure. */
-static const struct i2c_algo_bit_data parport_algo_data = {
- .setsda = parport_setsda,
- .setscl = parport_setscl,
- .getsda = parport_getsda,
- .getscl = parport_getscl,
- .udelay = 10, /* ~50 kbps */
- .timeout = HZ,
-};
-
-/* ----- I2c and parallel port call-back functions and structures --------- */
-
-void i2c_parport_irq(void *data)
-{
- struct i2c_par *adapter = data;
- struct i2c_client *ara = adapter->ara;
-
- if (ara) {
- dev_dbg(&ara->dev, "SMBus alert received\n");
- i2c_handle_smbus_alert(ara);
- } else
- dev_dbg(&adapter->adapter.dev,
- "SMBus alert received but no ARA client!\n");
-}
-
-static void i2c_parport_attach(struct parport *port)
-{
- struct i2c_par *adapter;
-
- adapter = kzalloc(sizeof(struct i2c_par), GFP_KERNEL);
- if (adapter == NULL) {
- printk(KERN_ERR "i2c-parport: Failed to kzalloc\n");
- return;
- }
-
- pr_debug("i2c-parport: 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);
- if (!adapter->pdev) {
- printk(KERN_ERR "i2c-parport: 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",
- sizeof(adapter->adapter.name));
- adapter->algo_data = parport_algo_data;
- /* Slow down if we can't sense SCL */
- if (!adapter_parm[type].getscl.val) {
- adapter->algo_data.getscl = NULL;
- adapter->algo_data.udelay = 50; /* ~10 kbps */
- }
- adapter->algo_data.data = port;
- adapter->adapter.algo_data = &adapter->algo_data;
- 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");
- goto err_unregister;
- }
-
- /* 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);
- /* Give powered devices some time to settle */
- msleep(100);
- }
-
- if (i2c_bit_add_bus(&adapter->adapter) < 0) {
- printk(KERN_ERR "i2c-parport: 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)
- parport_enable_irq(port);
- else
- printk(KERN_WARNING "i2c-parport: Failed to register "
- "ARA client\n");
- }
-
- /* Add the new adapter to the list */
- mutex_lock(&adapter_list_lock);
- list_add_tail(&adapter->node, &adapter_list);
- mutex_unlock(&adapter_list_lock);
- return;
-
- err_unregister:
- parport_release(adapter->pdev);
- parport_unregister_device(adapter->pdev);
- err_free:
- kfree(adapter);
-}
-
-static void i2c_parport_detach(struct parport *port)
-{
- struct i2c_par *adapter, *_n;
-
- /* Walk the list */
- mutex_lock(&adapter_list_lock);
- list_for_each_entry_safe(adapter, _n, &adapter_list, node) {
- if (adapter->pdev->port == port) {
- if (adapter->ara) {
- parport_disable_irq(port);
- i2c_unregister_device(adapter->ara);
- }
- i2c_del_adapter(&adapter->adapter);
-
- /* Un-init if needed (power off...) */
- if (adapter_parm[type].init.val)
- line_set(port, 0, &adapter_parm[type].init);
-
- parport_release(adapter->pdev);
- parport_unregister_device(adapter->pdev);
- list_del(&adapter->node);
- kfree(adapter);
- }
- }
- mutex_unlock(&adapter_list_lock);
-}
-
-static struct parport_driver i2c_parport_driver = {
- .name = "i2c-parport",
- .attach = i2c_parport_attach,
- .detach = i2c_parport_detach,
-};
-
-/* ----- 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_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 2025-03-30 20:18:19 +0000