436 lines
11 KiB
C
436 lines
11 KiB
C
/*
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*
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* device driver for philips saa7134 based TV cards
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* i2c interface support
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*
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* (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include "saa7134-reg.h"
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#include "saa7134.h"
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#include <media/v4l2-common.h>
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/* ----------------------------------------------------------- */
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static unsigned int i2c_debug;
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module_param(i2c_debug, int, 0644);
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MODULE_PARM_DESC(i2c_debug,"enable debug messages [i2c]");
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static unsigned int i2c_scan;
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module_param(i2c_scan, int, 0444);
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MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
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#define d1printk if (1 == i2c_debug) printk
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#define d2printk if (2 == i2c_debug) printk
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#define I2C_WAIT_DELAY 32
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#define I2C_WAIT_RETRY 16
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/* ----------------------------------------------------------- */
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static char *str_i2c_status[] = {
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"IDLE", "DONE_STOP", "BUSY", "TO_SCL", "TO_ARB", "DONE_WRITE",
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"DONE_READ", "DONE_WRITE_TO", "DONE_READ_TO", "NO_DEVICE",
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"NO_ACKN", "BUS_ERR", "ARB_LOST", "SEQ_ERR", "ST_ERR", "SW_ERR"
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};
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enum i2c_status {
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IDLE = 0, // no I2C command pending
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DONE_STOP = 1, // I2C command done and STOP executed
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BUSY = 2, // executing I2C command
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TO_SCL = 3, // executing I2C command, time out on clock stretching
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TO_ARB = 4, // time out on arbitration trial, still trying
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DONE_WRITE = 5, // I2C command done and awaiting next write command
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DONE_READ = 6, // I2C command done and awaiting next read command
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DONE_WRITE_TO = 7, // see 5, and time out on status echo
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DONE_READ_TO = 8, // see 6, and time out on status echo
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NO_DEVICE = 9, // no acknowledge on device slave address
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NO_ACKN = 10, // no acknowledge after data byte transfer
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BUS_ERR = 11, // bus error
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ARB_LOST = 12, // arbitration lost during transfer
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SEQ_ERR = 13, // erroneous programming sequence
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ST_ERR = 14, // wrong status echoing
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SW_ERR = 15 // software error
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};
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static char *str_i2c_attr[] = {
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"NOP", "STOP", "CONTINUE", "START"
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};
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enum i2c_attr {
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NOP = 0, // no operation on I2C bus
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STOP = 1, // stop condition, no associated byte transfer
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CONTINUE = 2, // continue with byte transfer
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START = 3 // start condition with byte transfer
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};
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static inline enum i2c_status i2c_get_status(struct saa7134_dev *dev)
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{
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enum i2c_status status;
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status = saa_readb(SAA7134_I2C_ATTR_STATUS) & 0x0f;
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d2printk(KERN_DEBUG "%s: i2c stat <= %s\n",dev->name,
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str_i2c_status[status]);
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return status;
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}
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static inline void i2c_set_status(struct saa7134_dev *dev,
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enum i2c_status status)
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{
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d2printk(KERN_DEBUG "%s: i2c stat => %s\n",dev->name,
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str_i2c_status[status]);
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saa_andorb(SAA7134_I2C_ATTR_STATUS,0x0f,status);
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}
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static inline void i2c_set_attr(struct saa7134_dev *dev, enum i2c_attr attr)
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{
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d2printk(KERN_DEBUG "%s: i2c attr => %s\n",dev->name,
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str_i2c_attr[attr]);
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saa_andorb(SAA7134_I2C_ATTR_STATUS,0xc0,attr << 6);
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}
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static inline int i2c_is_error(enum i2c_status status)
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{
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switch (status) {
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case NO_DEVICE:
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case NO_ACKN:
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case BUS_ERR:
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case ARB_LOST:
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case SEQ_ERR:
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case ST_ERR:
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return true;
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default:
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return false;
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}
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}
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static inline int i2c_is_idle(enum i2c_status status)
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{
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switch (status) {
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case IDLE:
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case DONE_STOP:
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return true;
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default:
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return false;
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}
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}
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static inline int i2c_is_busy(enum i2c_status status)
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{
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switch (status) {
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case BUSY:
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case TO_SCL:
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case TO_ARB:
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return true;
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default:
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return false;
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}
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}
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static int i2c_is_busy_wait(struct saa7134_dev *dev)
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{
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enum i2c_status status;
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int count;
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for (count = 0; count < I2C_WAIT_RETRY; count++) {
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status = i2c_get_status(dev);
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if (!i2c_is_busy(status))
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break;
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saa_wait(I2C_WAIT_DELAY);
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}
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if (I2C_WAIT_RETRY == count)
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return false;
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return true;
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}
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static int i2c_reset(struct saa7134_dev *dev)
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{
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enum i2c_status status;
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int count;
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d2printk(KERN_DEBUG "%s: i2c reset\n",dev->name);
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status = i2c_get_status(dev);
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if (!i2c_is_error(status))
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return true;
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i2c_set_status(dev,status);
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for (count = 0; count < I2C_WAIT_RETRY; count++) {
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status = i2c_get_status(dev);
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if (!i2c_is_error(status))
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break;
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udelay(I2C_WAIT_DELAY);
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}
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if (I2C_WAIT_RETRY == count)
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return false;
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if (!i2c_is_idle(status))
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return false;
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i2c_set_attr(dev,NOP);
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return true;
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}
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static inline int i2c_send_byte(struct saa7134_dev *dev,
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enum i2c_attr attr,
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unsigned char data)
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{
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enum i2c_status status;
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__u32 dword;
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/* have to write both attr + data in one 32bit word */
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dword = saa_readl(SAA7134_I2C_ATTR_STATUS >> 2);
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dword &= 0x0f;
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dword |= (attr << 6);
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dword |= ((__u32)data << 8);
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dword |= 0x00 << 16; /* 100 kHz */
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// dword |= 0x40 << 16; /* 400 kHz */
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dword |= 0xf0 << 24;
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saa_writel(SAA7134_I2C_ATTR_STATUS >> 2, dword);
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d2printk(KERN_DEBUG "%s: i2c data => 0x%x\n",dev->name,data);
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if (!i2c_is_busy_wait(dev))
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return -EIO;
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status = i2c_get_status(dev);
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if (i2c_is_error(status))
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return -EIO;
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return 0;
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}
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static inline int i2c_recv_byte(struct saa7134_dev *dev)
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{
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enum i2c_status status;
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unsigned char data;
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i2c_set_attr(dev,CONTINUE);
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if (!i2c_is_busy_wait(dev))
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return -EIO;
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status = i2c_get_status(dev);
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if (i2c_is_error(status))
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return -EIO;
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data = saa_readb(SAA7134_I2C_DATA);
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d2printk(KERN_DEBUG "%s: i2c data <= 0x%x\n",dev->name,data);
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return data;
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}
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static int saa7134_i2c_xfer(struct i2c_adapter *i2c_adap,
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struct i2c_msg *msgs, int num)
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{
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struct saa7134_dev *dev = i2c_adap->algo_data;
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enum i2c_status status;
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unsigned char data;
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int addr,rc,i,byte;
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status = i2c_get_status(dev);
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if (!i2c_is_idle(status))
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if (!i2c_reset(dev))
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return -EIO;
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d2printk("start xfer\n");
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d1printk(KERN_DEBUG "%s: i2c xfer:",dev->name);
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for (i = 0; i < num; i++) {
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if (!(msgs[i].flags & I2C_M_NOSTART) || 0 == i) {
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/* send address */
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d2printk("send address\n");
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addr = msgs[i].addr << 1;
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if (msgs[i].flags & I2C_M_RD)
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addr |= 1;
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if (i > 0 && msgs[i].flags &
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I2C_M_RD && msgs[i].addr != 0x40 &&
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msgs[i].addr != 0x19) {
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/* workaround for a saa7134 i2c bug
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* needed to talk to the mt352 demux
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* thanks to pinnacle for the hint */
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int quirk = 0xfe;
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d1printk(" [%02x quirk]",quirk);
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i2c_send_byte(dev,START,quirk);
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i2c_recv_byte(dev);
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}
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d1printk(" < %02x", addr);
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rc = i2c_send_byte(dev,START,addr);
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if (rc < 0)
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goto err;
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}
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if (msgs[i].flags & I2C_M_RD) {
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/* read bytes */
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d2printk("read bytes\n");
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for (byte = 0; byte < msgs[i].len; byte++) {
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d1printk(" =");
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rc = i2c_recv_byte(dev);
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if (rc < 0)
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goto err;
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d1printk("%02x", rc);
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msgs[i].buf[byte] = rc;
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}
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/* discard mysterious extra byte when reading
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from Samsung S5H1411. i2c bus gets error
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if we do not. */
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if (0x19 == msgs[i].addr) {
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d1printk(" ?");
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rc = i2c_recv_byte(dev);
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if (rc < 0)
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goto err;
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d1printk("%02x", rc);
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}
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} else {
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/* write bytes */
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d2printk("write bytes\n");
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for (byte = 0; byte < msgs[i].len; byte++) {
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data = msgs[i].buf[byte];
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d1printk(" %02x", data);
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rc = i2c_send_byte(dev,CONTINUE,data);
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if (rc < 0)
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goto err;
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}
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}
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}
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d2printk("xfer done\n");
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d1printk(" >");
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i2c_set_attr(dev,STOP);
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rc = -EIO;
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if (!i2c_is_busy_wait(dev))
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goto err;
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status = i2c_get_status(dev);
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if (i2c_is_error(status))
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goto err;
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/* ensure that the bus is idle for at least one bit slot */
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msleep(1);
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d1printk("\n");
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return num;
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err:
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if (1 == i2c_debug) {
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status = i2c_get_status(dev);
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printk(" ERROR: %s\n",str_i2c_status[status]);
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}
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return rc;
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}
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/* ----------------------------------------------------------- */
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static u32 functionality(struct i2c_adapter *adap)
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{
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return I2C_FUNC_SMBUS_EMUL;
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}
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static struct i2c_algorithm saa7134_algo = {
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.master_xfer = saa7134_i2c_xfer,
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.functionality = functionality,
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};
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static struct i2c_adapter saa7134_adap_template = {
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.owner = THIS_MODULE,
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.name = "saa7134",
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.algo = &saa7134_algo,
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};
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static struct i2c_client saa7134_client_template = {
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.name = "saa7134 internal",
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};
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/* ----------------------------------------------------------- */
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static int
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saa7134_i2c_eeprom(struct saa7134_dev *dev, unsigned char *eedata, int len)
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{
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unsigned char buf;
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int i,err;
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dev->i2c_client.addr = 0xa0 >> 1;
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buf = 0;
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if (1 != (err = i2c_master_send(&dev->i2c_client,&buf,1))) {
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printk(KERN_INFO "%s: Huh, no eeprom present (err=%d)?\n",
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dev->name,err);
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return -1;
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}
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if (len != (err = i2c_master_recv(&dev->i2c_client,eedata,len))) {
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printk(KERN_WARNING "%s: i2c eeprom read error (err=%d)\n",
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dev->name,err);
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return -1;
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}
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for (i = 0; i < len; i++) {
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if (0 == (i % 16))
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printk(KERN_INFO "%s: i2c eeprom %02x:",dev->name,i);
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printk(" %02x",eedata[i]);
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if (15 == (i % 16))
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printk("\n");
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}
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return 0;
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}
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static char *i2c_devs[128] = {
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[ 0x20 ] = "mpeg encoder (saa6752hs)",
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[ 0xa0 >> 1 ] = "eeprom",
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[ 0xc0 >> 1 ] = "tuner (analog)",
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[ 0x86 >> 1 ] = "tda9887",
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[ 0x5a >> 1 ] = "remote control",
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};
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static void do_i2c_scan(char *name, struct i2c_client *c)
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{
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unsigned char buf;
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int i,rc;
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for (i = 0; i < ARRAY_SIZE(i2c_devs); i++) {
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c->addr = i;
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rc = i2c_master_recv(c,&buf,0);
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if (rc < 0)
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continue;
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printk("%s: i2c scan: found device @ 0x%x [%s]\n",
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name, i << 1, i2c_devs[i] ? i2c_devs[i] : "???");
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}
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}
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int saa7134_i2c_register(struct saa7134_dev *dev)
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{
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dev->i2c_adap = saa7134_adap_template;
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dev->i2c_adap.dev.parent = &dev->pci->dev;
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strcpy(dev->i2c_adap.name,dev->name);
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dev->i2c_adap.algo_data = dev;
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i2c_set_adapdata(&dev->i2c_adap, &dev->v4l2_dev);
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i2c_add_adapter(&dev->i2c_adap);
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dev->i2c_client = saa7134_client_template;
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dev->i2c_client.adapter = &dev->i2c_adap;
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saa7134_i2c_eeprom(dev,dev->eedata,sizeof(dev->eedata));
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if (i2c_scan)
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do_i2c_scan(dev->name,&dev->i2c_client);
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/* Instantiate the IR receiver device, if present */
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saa7134_probe_i2c_ir(dev);
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return 0;
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}
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int saa7134_i2c_unregister(struct saa7134_dev *dev)
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{
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i2c_del_adapter(&dev->i2c_adap);
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return 0;
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}
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/* ----------------------------------------------------------- */
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/*
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* Local variables:
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* c-basic-offset: 8
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* End:
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*/
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