diff options
Diffstat (limited to 'drivers/staging/go7007/go7007-i2c.c')
| -rw-r--r-- | drivers/staging/go7007/go7007-i2c.c | 308 |
1 files changed, 0 insertions, 308 deletions
diff --git a/drivers/staging/go7007/go7007-i2c.c b/drivers/staging/go7007/go7007-i2c.c deleted file mode 100644 index cd55b76eabc..00000000000 --- a/drivers/staging/go7007/go7007-i2c.c +++ /dev/null @@ -1,308 +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/semaphore.h> -#include <linux/uaccess.h> -#include <asm/system.h> - -#include "go7007-priv.h" -#include "wis-i2c.h" - -/************** Registration interface for I2C client drivers **************/ - -/* Since there's no way to auto-probe the I2C devices connected to the I2C - * bus on the go7007, we have this silly little registration system that - * client drivers can use to register their I2C driver ID and their - * detect_client function (the one that's normally passed to i2c_probe). - * - * When a new go7007 device is connected, we can look up in a board info - * table by the USB or PCI vendor/product/revision ID to determine - * which I2C client module to load. The client driver module will register - * itself here, and then we can call the registered detect_client function - * to force-load a new client at the address listed in the board info table. - * - * Really the I2C subsystem should have a way to force-load I2C client - * drivers when we have a priori knowledge of what's on the bus, especially - * since the existing I2C auto-probe mechanism is so hokey, but we'll use - * our own mechanism for the time being. */ - -struct wis_i2c_client_driver { - unsigned int id; - found_proc found_proc; - struct list_head list; -}; - -static LIST_HEAD(i2c_client_drivers); -static DECLARE_MUTEX(i2c_client_driver_list_lock); - -/* Client drivers register here by their I2C driver ID */ -int wis_i2c_add_driver(unsigned int id, found_proc found_proc) -{ - struct wis_i2c_client_driver *driver; - - driver = kmalloc(sizeof(struct wis_i2c_client_driver), GFP_KERNEL); - if (driver == NULL) - return -ENOMEM; - driver->id = id; - driver->found_proc = found_proc; - - down(&i2c_client_driver_list_lock); - list_add_tail(&driver->list, &i2c_client_drivers); - up(&i2c_client_driver_list_lock); - - return 0; -} -EXPORT_SYMBOL(wis_i2c_add_driver); - -void wis_i2c_del_driver(found_proc found_proc) -{ - struct wis_i2c_client_driver *driver, *next; - - down(&i2c_client_driver_list_lock); - list_for_each_entry_safe(driver, next, &i2c_client_drivers, list) - if (driver->found_proc == found_proc) { - list_del(&driver->list); - kfree(driver); - } - up(&i2c_client_driver_list_lock); -} -EXPORT_SYMBOL(wis_i2c_del_driver); - -/* The main go7007 driver calls this to instantiate a client by driver - * ID and bus address, which are both stored in the board info table */ -int wis_i2c_probe_device(struct i2c_adapter *adapter, - unsigned int id, int addr) -{ - struct wis_i2c_client_driver *driver; - int found = 0; - - if (addr < 0 || addr > 0x7f) - return -1; - down(&i2c_client_driver_list_lock); - list_for_each_entry(driver, &i2c_client_drivers, list) - if (driver->id == id) { - if (driver->found_proc(adapter, addr, 0) == 0) - found = 1; - break; - } - up(&i2c_client_driver_list_lock); - return found; -} - -/********************* 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 DECLARE_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 - - down(&go->hw_lock); - - if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) { - /* Bridge the I2C port on this GO7007 to the shared bus */ - down(&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); - up(&adlink_mpg24_i2c_lock); - } - up(&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, - .class = I2C_CLASS_TV_ANALOG, - .name = "WIS GO7007SB", - .id = I2C_ALGO_GO7007, - .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; -} |