7c518eb84c
Remove unnecessary NULL check. Being a function private to the driver, out_edid can never be NULL. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
216 lines
6 KiB
C
216 lines
6 KiB
C
/*-*- linux-c -*-
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* linux/drivers/video/i810-i2c.c -- Intel 810/815 I2C support
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*
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* Copyright (C) 2004 Antonino Daplas<adaplas@pol.net>
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* All Rights Reserved
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/pci.h>
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#include <linux/fb.h>
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#include "i810.h"
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#include "i810_regs.h"
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#include "i810_main.h"
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#include "../edid.h"
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#define I810_DDC 0x50
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/* bit locations in the registers */
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#define SCL_DIR_MASK 0x0001
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#define SCL_DIR 0x0002
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#define SCL_VAL_MASK 0x0004
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#define SCL_VAL_OUT 0x0008
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#define SCL_VAL_IN 0x0010
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#define SDA_DIR_MASK 0x0100
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#define SDA_DIR 0x0200
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#define SDA_VAL_MASK 0x0400
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#define SDA_VAL_OUT 0x0800
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#define SDA_VAL_IN 0x1000
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#define DEBUG /* define this for verbose EDID parsing output */
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#ifdef DEBUG
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#define DPRINTK(fmt, args...) printk(fmt,## args)
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#else
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#define DPRINTK(fmt, args...)
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#endif
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static void i810i2c_setscl(void *data, int state)
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{
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struct i810fb_i2c_chan *chan = data;
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struct i810fb_par *par = chan->par;
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u8 __iomem *mmio = par->mmio_start_virtual;
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i810_writel(mmio, chan->ddc_base, (state ? SCL_VAL_OUT : 0) | SCL_DIR |
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SCL_DIR_MASK | SCL_VAL_MASK);
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i810_readl(mmio, chan->ddc_base); /* flush posted write */
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}
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static void i810i2c_setsda(void *data, int state)
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{
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struct i810fb_i2c_chan *chan = data;
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struct i810fb_par *par = chan->par;
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u8 __iomem *mmio = par->mmio_start_virtual;
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i810_writel(mmio, chan->ddc_base, (state ? SDA_VAL_OUT : 0) | SDA_DIR |
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SDA_DIR_MASK | SDA_VAL_MASK);
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i810_readl(mmio, chan->ddc_base); /* flush posted write */
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}
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static int i810i2c_getscl(void *data)
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{
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struct i810fb_i2c_chan *chan = data;
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struct i810fb_par *par = chan->par;
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u8 __iomem *mmio = par->mmio_start_virtual;
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i810_writel(mmio, chan->ddc_base, SCL_DIR_MASK);
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i810_writel(mmio, chan->ddc_base, 0);
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return ((i810_readl(mmio, chan->ddc_base) & SCL_VAL_IN) != 0);
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}
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static int i810i2c_getsda(void *data)
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{
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struct i810fb_i2c_chan *chan = data;
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struct i810fb_par *par = chan->par;
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u8 __iomem *mmio = par->mmio_start_virtual;
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i810_writel(mmio, chan->ddc_base, SDA_DIR_MASK);
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i810_writel(mmio, chan->ddc_base, 0);
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return ((i810_readl(mmio, chan->ddc_base) & SDA_VAL_IN) != 0);
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}
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static int i810_setup_i2c_bus(struct i810fb_i2c_chan *chan, const char *name)
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{
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int rc;
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strcpy(chan->adapter.name, name);
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chan->adapter.owner = THIS_MODULE;
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chan->adapter.algo_data = &chan->algo;
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chan->adapter.dev.parent = &chan->par->dev->dev;
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chan->adapter.id = I2C_HW_B_I810;
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chan->algo.setsda = i810i2c_setsda;
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chan->algo.setscl = i810i2c_setscl;
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chan->algo.getsda = i810i2c_getsda;
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chan->algo.getscl = i810i2c_getscl;
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chan->algo.udelay = 10;
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chan->algo.mdelay = 10;
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chan->algo.timeout = (HZ/2);
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chan->algo.data = chan;
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i2c_set_adapdata(&chan->adapter, chan);
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/* Raise SCL and SDA */
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chan->algo.setsda(chan, 1);
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chan->algo.setscl(chan, 1);
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udelay(20);
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rc = i2c_bit_add_bus(&chan->adapter);
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if (rc == 0)
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dev_dbg(&chan->par->dev->dev, "I2C bus %s registered.\n",name);
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else {
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dev_warn(&chan->par->dev->dev, "Failed to register I2C bus "
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"%s.\n", name);
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chan->par = NULL;
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}
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return rc;
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}
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void i810_create_i2c_busses(struct i810fb_par *par)
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{
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par->chan[0].par = par;
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par->chan[1].par = par;
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par->chan[2].par = par;
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par->chan[0].ddc_base = GPIOA;
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i810_setup_i2c_bus(&par->chan[0], "I810-DDC");
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par->chan[1].ddc_base = GPIOB;
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i810_setup_i2c_bus(&par->chan[1], "I810-I2C");
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par->chan[2].ddc_base = GPIOC;
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i810_setup_i2c_bus(&par->chan[2], "I810-GPIOC");
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}
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void i810_delete_i2c_busses(struct i810fb_par *par)
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{
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if (par->chan[0].par)
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i2c_bit_del_bus(&par->chan[0].adapter);
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par->chan[0].par = NULL;
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if (par->chan[1].par)
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i2c_bit_del_bus(&par->chan[1].adapter);
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par->chan[1].par = NULL;
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if (par->chan[2].par)
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i2c_bit_del_bus(&par->chan[2].adapter);
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par->chan[2].par = NULL;
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}
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static u8 *i810_do_probe_i2c_edid(struct i810fb_i2c_chan *chan)
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{
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u8 start = 0x0;
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struct i2c_msg msgs[] = {
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{
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.addr = I810_DDC,
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.len = 1,
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.buf = &start,
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}, {
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.addr = I810_DDC,
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.flags = I2C_M_RD,
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.len = EDID_LENGTH,
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},
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};
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u8 *buf;
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buf = kmalloc(EDID_LENGTH, GFP_KERNEL);
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if (!buf) {
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DPRINTK("i810-i2c: Failed to allocate memory\n");
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return NULL;
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}
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msgs[1].buf = buf;
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if (i2c_transfer(&chan->adapter, msgs, 2) == 2) {
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DPRINTK("i810-i2c: I2C Transfer successful\n");
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return buf;
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}
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DPRINTK("i810-i2c: Unable to read EDID block.\n");
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kfree(buf);
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return NULL;
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}
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int i810_probe_i2c_connector(struct fb_info *info, u8 **out_edid, int conn)
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{
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struct i810fb_par *par = info->par;
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u8 *edid = NULL;
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int i;
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DPRINTK("i810-i2c: Probe DDC%i Bus\n", conn+1);
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if (conn < par->ddc_num) {
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for (i = 0; i < 3; i++) {
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/* Do the real work */
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edid = i810_do_probe_i2c_edid(&par->chan[conn]);
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if (edid)
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break;
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}
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} else {
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const u8 *e = fb_firmware_edid(info->device);
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if (e != NULL) {
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DPRINTK("i810-i2c: Getting EDID from BIOS\n");
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edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
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if (edid)
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memcpy(edid, e, EDID_LENGTH);
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}
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}
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*out_edid = edid;
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return (edid) ? 0 : 1;
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}
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