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Diffstat (limited to 'drivers/i2c/busses/i2c-pmac-smu.c')
-rw-r--r--drivers/i2c/busses/i2c-pmac-smu.c324
1 files changed, 0 insertions, 324 deletions
diff --git a/drivers/i2c/busses/i2c-pmac-smu.c b/drivers/i2c/busses/i2c-pmac-smu.c
deleted file mode 100644
index 7d925be3fd4..00000000000
--- a/drivers/i2c/busses/i2c-pmac-smu.c
+++ /dev/null
@@ -1,324 +0,0 @@
-/*
- i2c Support for Apple SMU Controller
-
- Copyright (c) 2005 Benjamin Herrenschmidt, IBM Corp.
- <benh@kernel.crashing.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.
-
-*/
-
-#include <linux/config.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/types.h>
-#include <linux/i2c.h>
-#include <linux/init.h>
-#include <linux/completion.h>
-#include <linux/device.h>
-#include <asm/prom.h>
-#include <asm/of_device.h>
-#include <asm/smu.h>
-
-static int probe;
-
-MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
-MODULE_DESCRIPTION("I2C driver for Apple's SMU");
-MODULE_LICENSE("GPL");
-module_param(probe, bool, 0);
-
-
-/* Physical interface */
-struct smu_iface
-{
- struct i2c_adapter adapter;
- struct completion complete;
- u32 busid;
-};
-
-static void smu_i2c_done(struct smu_i2c_cmd *cmd, void *misc)
-{
- struct smu_iface *iface = misc;
- complete(&iface->complete);
-}
-
-/*
- * SMBUS-type transfer entrypoint
- */
-static s32 smu_smbus_xfer( struct i2c_adapter* adap,
- u16 addr,
- unsigned short flags,
- char read_write,
- u8 command,
- int size,
- union i2c_smbus_data* data)
-{
- struct smu_iface *iface = i2c_get_adapdata(adap);
- struct smu_i2c_cmd cmd;
- int rc = 0;
- int read = (read_write == I2C_SMBUS_READ);
-
- cmd.info.bus = iface->busid;
- cmd.info.devaddr = (addr << 1) | (read ? 0x01 : 0x00);
-
- /* Prepare datas & select mode */
- switch (size) {
- case I2C_SMBUS_QUICK:
- cmd.info.type = SMU_I2C_TRANSFER_SIMPLE;
- cmd.info.datalen = 0;
- break;
- case I2C_SMBUS_BYTE:
- cmd.info.type = SMU_I2C_TRANSFER_SIMPLE;
- cmd.info.datalen = 1;
- if (!read)
- cmd.info.data[0] = data->byte;
- break;
- case I2C_SMBUS_BYTE_DATA:
- cmd.info.type = SMU_I2C_TRANSFER_STDSUB;
- cmd.info.datalen = 1;
- cmd.info.sublen = 1;
- cmd.info.subaddr[0] = command;
- cmd.info.subaddr[1] = 0;
- cmd.info.subaddr[2] = 0;
- if (!read)
- cmd.info.data[0] = data->byte;
- break;
- case I2C_SMBUS_WORD_DATA:
- cmd.info.type = SMU_I2C_TRANSFER_STDSUB;
- cmd.info.datalen = 2;
- cmd.info.sublen = 1;
- cmd.info.subaddr[0] = command;
- cmd.info.subaddr[1] = 0;
- cmd.info.subaddr[2] = 0;
- if (!read) {
- cmd.info.data[0] = data->word & 0xff;
- cmd.info.data[1] = (data->word >> 8) & 0xff;
- }
- break;
- /* Note that these are broken vs. the expected smbus API where
- * on reads, the lenght is actually returned from the function,
- * but I think the current API makes no sense and I don't want
- * any driver that I haven't verified for correctness to go
- * anywhere near a pmac i2c bus anyway ...
- */
- case I2C_SMBUS_BLOCK_DATA:
- cmd.info.type = SMU_I2C_TRANSFER_STDSUB;
- cmd.info.datalen = data->block[0] + 1;
- if (cmd.info.datalen > (SMU_I2C_WRITE_MAX + 1))
- return -EINVAL;
- if (!read)
- memcpy(cmd.info.data, data->block, cmd.info.datalen);
- cmd.info.sublen = 1;
- cmd.info.subaddr[0] = command;
- cmd.info.subaddr[1] = 0;
- cmd.info.subaddr[2] = 0;
- break;
- case I2C_SMBUS_I2C_BLOCK_DATA:
- cmd.info.type = SMU_I2C_TRANSFER_STDSUB;
- cmd.info.datalen = data->block[0];
- if (cmd.info.datalen > 7)
- return -EINVAL;
- if (!read)
- memcpy(cmd.info.data, &data->block[1],
- cmd.info.datalen);
- cmd.info.sublen = 1;
- cmd.info.subaddr[0] = command;
- cmd.info.subaddr[1] = 0;
- cmd.info.subaddr[2] = 0;
- break;
-
- default:
- return -EINVAL;
- }
-
- /* Turn a standardsub read into a combined mode access */
- if (read_write == I2C_SMBUS_READ &&
- cmd.info.type == SMU_I2C_TRANSFER_STDSUB)
- cmd.info.type = SMU_I2C_TRANSFER_COMBINED;
-
- /* Finish filling command and submit it */
- cmd.done = smu_i2c_done;
- cmd.misc = iface;
- rc = smu_queue_i2c(&cmd);
- if (rc < 0)
- return rc;
- wait_for_completion(&iface->complete);
- rc = cmd.status;
-
- if (!read || rc < 0)
- return rc;
-
- switch (size) {
- case I2C_SMBUS_BYTE:
- case I2C_SMBUS_BYTE_DATA:
- data->byte = cmd.info.data[0];
- break;
- case I2C_SMBUS_WORD_DATA:
- data->word = ((u16)cmd.info.data[1]) << 8;
- data->word |= cmd.info.data[0];
- break;
- /* Note that these are broken vs. the expected smbus API where
- * on reads, the lenght is actually returned from the function,
- * but I think the current API makes no sense and I don't want
- * any driver that I haven't verified for correctness to go
- * anywhere near a pmac i2c bus anyway ...
- */
- case I2C_SMBUS_BLOCK_DATA:
- case I2C_SMBUS_I2C_BLOCK_DATA:
- memcpy(&data->block[0], cmd.info.data, cmd.info.datalen);
- break;
- }
-
- return rc;
-}
-
-static u32
-smu_smbus_func(struct i2c_adapter * adapter)
-{
- return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
- I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
- I2C_FUNC_SMBUS_BLOCK_DATA;
-}
-
-/* For now, we only handle combined mode (smbus) */
-static struct i2c_algorithm smu_algorithm = {
- .smbus_xfer = smu_smbus_xfer,
- .functionality = smu_smbus_func,
-};
-
-static int create_iface(struct device_node *np, struct device *dev)
-{
- struct smu_iface* iface;
- u32 *reg, busid;
- int rc;
-
- reg = (u32 *)get_property(np, "reg", NULL);
- if (reg == NULL) {
- printk(KERN_ERR "i2c-pmac-smu: can't find bus number !\n");
- return -ENXIO;
- }
- busid = *reg;
-
- iface = kzalloc(sizeof(struct smu_iface), GFP_KERNEL);
- if (iface == NULL) {
- printk(KERN_ERR "i2c-pmac-smu: can't allocate inteface !\n");
- return -ENOMEM;
- }
- init_completion(&iface->complete);
- iface->busid = busid;
-
- dev_set_drvdata(dev, iface);
-
- sprintf(iface->adapter.name, "smu-i2c-%02x", busid);
- iface->adapter.algo = &smu_algorithm;
- iface->adapter.algo_data = NULL;
- iface->adapter.client_register = NULL;
- iface->adapter.client_unregister = NULL;
- i2c_set_adapdata(&iface->adapter, iface);
- iface->adapter.dev.parent = dev;
-
- rc = i2c_add_adapter(&iface->adapter);
- if (rc) {
- printk(KERN_ERR "i2c-pamc-smu.c: Adapter %s registration "
- "failed\n", iface->adapter.name);
- i2c_set_adapdata(&iface->adapter, NULL);
- }
-
- if (probe) {
- unsigned char addr;
- printk("Probe: ");
- for (addr = 0x00; addr <= 0x7f; addr++) {
- if (i2c_smbus_xfer(&iface->adapter,addr,
- 0,0,0,I2C_SMBUS_QUICK,NULL) >= 0)
- printk("%02x ", addr);
- }
- printk("\n");
- }
-
- printk(KERN_INFO "SMU i2c bus %x registered\n", busid);
-
- return 0;
-}
-
-static int dispose_iface(struct device *dev)
-{
- struct smu_iface *iface = dev_get_drvdata(dev);
- int rc;
-
- rc = i2c_del_adapter(&iface->adapter);
- i2c_set_adapdata(&iface->adapter, NULL);
- /* We aren't that prepared to deal with this... */
- if (rc)
- printk("i2c-pmac-smu.c: Failed to remove bus %s !\n",
- iface->adapter.name);
- dev_set_drvdata(dev, NULL);
- kfree(iface);
-
- return 0;
-}
-
-
-static int create_iface_of_platform(struct of_device* dev,
- const struct of_device_id *match)
-{
- struct device_node *node = dev->node;
-
- if (device_is_compatible(node, "smu-i2c") ||
- (node->parent != NULL &&
- device_is_compatible(node->parent, "smu-i2c-control")))
- return create_iface(node, &dev->dev);
- return -ENODEV;
-}
-
-
-static int dispose_iface_of_platform(struct of_device* dev)
-{
- return dispose_iface(&dev->dev);
-}
-
-
-static struct of_device_id i2c_smu_match[] =
-{
- {
- .compatible = "smu-i2c",
- },
- {
- .compatible = "i2c-bus",
- },
- {},
-};
-static struct of_platform_driver i2c_smu_of_platform_driver =
-{
- .name = "i2c-smu",
- .match_table = i2c_smu_match,
- .probe = create_iface_of_platform,
- .remove = dispose_iface_of_platform
-};
-
-
-static int __init i2c_pmac_smu_init(void)
-{
- of_register_driver(&i2c_smu_of_platform_driver);
- return 0;
-}
-
-
-static void __exit i2c_pmac_smu_cleanup(void)
-{
- of_unregister_driver(&i2c_smu_of_platform_driver);
-}
-
-module_init(i2c_pmac_smu_init);
-module_exit(i2c_pmac_smu_cleanup);
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