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path: root/drivers/staging/go7007/go7007-i2c.c
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Diffstat (limited to 'drivers/staging/go7007/go7007-i2c.c')
-rw-r--r--drivers/staging/go7007/go7007-i2c.c225
1 files changed, 0 insertions, 225 deletions
diff --git a/drivers/staging/go7007/go7007-i2c.c b/drivers/staging/go7007/go7007-i2c.c
deleted file mode 100644
index b8cfa1a6eae..00000000000
--- a/drivers/staging/go7007/go7007-i2c.c
+++ /dev/null
@@ -1,225 +0,0 @@
-/*
- * Copyright (C) 2005-2006 Micronas USA Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License (Version 2) as
- * published by the Free Software Foundation.
- *
- * 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., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#include <linux/sched.h>
-#include <linux/list.h>
-#include <linux/unistd.h>
-#include <linux/time.h>
-#include <linux/device.h>
-#include <linux/i2c.h>
-#include <linux/mutex.h>
-#include <linux/uaccess.h>
-#include <asm/system.h>
-
-#include "go7007-priv.h"
-#include "wis-i2c.h"
-
-/********************* Driver for on-board I2C adapter *********************/
-
-/* #define GO7007_I2C_DEBUG */
-
-#define SPI_I2C_ADDR_BASE 0x1400
-#define STATUS_REG_ADDR (SPI_I2C_ADDR_BASE + 0x2)
-#define I2C_CTRL_REG_ADDR (SPI_I2C_ADDR_BASE + 0x6)
-#define I2C_DEV_UP_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x7)
-#define I2C_LO_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x8)
-#define I2C_DATA_REG_ADDR (SPI_I2C_ADDR_BASE + 0x9)
-#define I2C_CLKFREQ_REG_ADDR (SPI_I2C_ADDR_BASE + 0xa)
-
-#define I2C_STATE_MASK 0x0007
-#define I2C_READ_READY_MASK 0x0008
-
-/* There is only one I2C port on the TW2804 that feeds all four GO7007 VIPs
- * on the Adlink PCI-MPG24, so access is shared between all of them. */
-static DEFINE_MUTEX(adlink_mpg24_i2c_lock);
-
-static int go7007_i2c_xfer(struct go7007 *go, u16 addr, int read,
- u16 command, int flags, u8 *data)
-{
- int i, ret = -1;
- u16 val;
-
- if (go->status == STATUS_SHUTDOWN)
- return -1;
-
-#ifdef GO7007_I2C_DEBUG
- if (read)
- printk(KERN_DEBUG "go7007-i2c: reading 0x%02x on 0x%02x\n",
- command, addr);
- else
- printk(KERN_DEBUG
- "go7007-i2c: writing 0x%02x to 0x%02x on 0x%02x\n",
- *data, command, addr);
-#endif
-
- mutex_lock(&go->hw_lock);
-
- if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) {
- /* Bridge the I2C port on this GO7007 to the shared bus */
- mutex_lock(&adlink_mpg24_i2c_lock);
- go7007_write_addr(go, 0x3c82, 0x0020);
- }
-
- /* Wait for I2C adapter to be ready */
- for (i = 0; i < 10; ++i) {
- if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0)
- goto i2c_done;
- if (!(val & I2C_STATE_MASK))
- break;
- msleep(100);
- }
- if (i == 10) {
- printk(KERN_ERR "go7007-i2c: I2C adapter is hung\n");
- goto i2c_done;
- }
-
- /* Set target register (command) */
- go7007_write_addr(go, I2C_CTRL_REG_ADDR, flags);
- go7007_write_addr(go, I2C_LO_ADDR_REG_ADDR, command);
-
- /* If we're writing, send the data and target address and we're done */
- if (!read) {
- go7007_write_addr(go, I2C_DATA_REG_ADDR, *data);
- go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR,
- (addr << 9) | (command >> 8));
- ret = 0;
- goto i2c_done;
- }
-
- /* Otherwise, we're reading. First clear i2c_rx_data_rdy. */
- if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0)
- goto i2c_done;
-
- /* Send the target address plus read flag */
- go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR,
- (addr << 9) | 0x0100 | (command >> 8));
-
- /* Wait for i2c_rx_data_rdy */
- for (i = 0; i < 10; ++i) {
- if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0)
- goto i2c_done;
- if (val & I2C_READ_READY_MASK)
- break;
- msleep(100);
- }
- if (i == 10) {
- printk(KERN_ERR "go7007-i2c: I2C adapter is hung\n");
- goto i2c_done;
- }
-
- /* Retrieve the read byte */
- if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0)
- goto i2c_done;
- *data = val;
- ret = 0;
-
-i2c_done:
- if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) {
- /* Isolate the I2C port on this GO7007 from the shared bus */
- go7007_write_addr(go, 0x3c82, 0x0000);
- mutex_unlock(&adlink_mpg24_i2c_lock);
- }
- mutex_unlock(&go->hw_lock);
- return ret;
-}
-
-static int go7007_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
- unsigned short flags, char read_write,
- u8 command, int size, union i2c_smbus_data *data)
-{
- struct go7007 *go = i2c_get_adapdata(adapter);
-
- if (size != I2C_SMBUS_BYTE_DATA)
- return -1;
- return go7007_i2c_xfer(go, addr, read_write == I2C_SMBUS_READ, command,
- flags & I2C_CLIENT_SCCB ? 0x10 : 0x00, &data->byte);
-}
-
-/* VERY LIMITED I2C master xfer function -- only needed because the
- * SMBus functions only support 8-bit commands and the SAA7135 uses
- * 16-bit commands. The I2C interface on the GO7007, as limited as
- * it is, does support this mode. */
-
-static int go7007_i2c_master_xfer(struct i2c_adapter *adapter,
- struct i2c_msg msgs[], int num)
-{
- struct go7007 *go = i2c_get_adapdata(adapter);
- int i;
-
- for (i = 0; i < num; ++i) {
- /* We can only do two things here -- write three bytes, or
- * write two bytes and read one byte. */
- if (msgs[i].len == 2) {
- if (i + 1 == num || msgs[i].addr != msgs[i + 1].addr ||
- (msgs[i].flags & I2C_M_RD) ||
- !(msgs[i + 1].flags & I2C_M_RD) ||
- msgs[i + 1].len != 1)
- return -1;
- if (go7007_i2c_xfer(go, msgs[i].addr, 1,
- (msgs[i].buf[0] << 8) | msgs[i].buf[1],
- 0x01, &msgs[i + 1].buf[0]) < 0)
- return -1;
- ++i;
- } else if (msgs[i].len == 3) {
- if (msgs[i].flags & I2C_M_RD)
- return -1;
- if (msgs[i].len != 3)
- return -1;
- if (go7007_i2c_xfer(go, msgs[i].addr, 0,
- (msgs[i].buf[0] << 8) | msgs[i].buf[1],
- 0x01, &msgs[i].buf[2]) < 0)
- return -1;
- } else
- return -1;
- }
-
- return 0;
-}
-
-static u32 go7007_functionality(struct i2c_adapter *adapter)
-{
- return I2C_FUNC_SMBUS_BYTE_DATA;
-}
-
-static struct i2c_algorithm go7007_algo = {
- .smbus_xfer = go7007_smbus_xfer,
- .master_xfer = go7007_i2c_master_xfer,
- .functionality = go7007_functionality,
-};
-
-static struct i2c_adapter go7007_adap_templ = {
- .owner = THIS_MODULE,
- .name = "WIS GO7007SB",
- .algo = &go7007_algo,
-};
-
-int go7007_i2c_init(struct go7007 *go)
-{
- memcpy(&go->i2c_adapter, &go7007_adap_templ,
- sizeof(go7007_adap_templ));
- go->i2c_adapter.dev.parent = go->dev;
- i2c_set_adapdata(&go->i2c_adapter, go);
- if (i2c_add_adapter(&go->i2c_adapter) < 0) {
- printk(KERN_ERR
- "go7007-i2c: error: i2c_add_adapter failed\n");
- return -1;
- }
- return 0;
-}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 22:48:46 +0000