/* * linux/radeon_i2c.c * * Original author probably Benjamin Herrenschmidt <benh@kernel.crashing.org> * or Kronos <kronos@kronoz.cjb.net> * Based on Xfree sources * (C) Copyright 2004 Jon Smirl <jonsmirl@gmail.com> * * This is a GPL licensed file from the Linux kernel, don't add it to the BSD build * * Radeon I2C support routines * */ #include <linux/config.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/delay.h> #include <linux/pci.h> #include <linux/fb.h> #include <linux/version.h> #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0) #include <asm/io.h> #include <video/radeon.h> #include "radeon.h" #include "drmP.h" #include "drm.h" #include "radeon_drm.h" #include "radeon_drv.h" static void gpio_setscl(void* data, int state) { struct radeon_i2c_chan *chan = data; drm_radeon_private_t *dev_priv = chan->dev->dev_private; u32 val; val = RADEON_READ(chan->ddc_reg) & ~(VGA_DDC_CLK_OUT_EN); if (!state) val |= VGA_DDC_CLK_OUT_EN; RADEON_WRITE(chan->ddc_reg, val); (void)RADEON_READ(chan->ddc_reg); } static void gpio_setsda(void* data, int state) { struct radeon_i2c_chan *chan = data; drm_radeon_private_t *dev_priv = chan->dev->dev_private; u32 val; val = RADEON_READ(chan->ddc_reg) & ~(VGA_DDC_DATA_OUT_EN); if (!state) val |= VGA_DDC_DATA_OUT_EN; RADEON_WRITE(chan->ddc_reg, val); (void)RADEON_READ(chan->ddc_reg); } static int gpio_getscl(void* data) { struct radeon_i2c_chan *chan = data; drm_radeon_private_t *dev_priv = chan->dev->dev_private; u32 val; val = RADEON_READ(chan->ddc_reg); return (val & VGA_DDC_CLK_INPUT) ? 1 : 0; } static int gpio_getsda(void* data) { struct radeon_i2c_chan *chan = data; drm_radeon_private_t *dev_priv = chan->dev->dev_private; u32 val; val = RADEON_READ(chan->ddc_reg); return (val & VGA_DDC_DATA_INPUT) ? 1 : 0; } static int setup_i2c_bus(struct radeon_i2c_chan *chan, const char *name) { int rc; strcpy(chan->adapter.name, name); chan->adapter.owner = THIS_MODULE; chan->adapter.id = I2C_ALGO_ATI; chan->adapter.algo_data = &chan->algo; chan->adapter.dev.parent = &chan->dev->pdev->dev; chan->algo.setsda = gpio_setsda; chan->algo.setscl = gpio_setscl; chan->algo.getsda = gpio_getsda; chan->algo.getscl = gpio_getscl; chan->algo.udelay = 40; chan->algo.timeout = 20; chan->algo.data = chan; i2c_set_adapdata(&chan->adapter, chan); /* Raise SCL and SDA */ gpio_setsda(chan, 1); gpio_setscl(chan, 1); udelay(20); rc = i2c_bit_add_bus(&chan->adapter); if (rc == 0) DRM_DEBUG("I2C bus %s registered.\n", name); else DRM_ERROR("Failed to register I2C bus %s.\n", name); return rc; } int radeon_create_i2c_busses(drm_device_t *dev) { drm_radeon_private_t *dev_priv = dev->dev_private; int ret; dev_priv->i2c[0].dev = dev; dev_priv->i2c[0].ddc_reg = GPIO_MONID; if ((ret = setup_i2c_bus(&dev_priv->i2c[0], "monid"))) return ret; dev_priv->i2c[1].dev = dev; dev_priv->i2c[1].ddc_reg = GPIO_DVI_DDC; if ((ret = setup_i2c_bus(&dev_priv->i2c[1], "dvi"))) return ret; dev_priv->i2c[2].dev = dev; dev_priv->i2c[2].ddc_reg = GPIO_VGA_DDC; if ((ret = setup_i2c_bus(&dev_priv->i2c[2], "vga"))) return ret; dev_priv->i2c[3].dev = dev; dev_priv->i2c[3].ddc_reg = GPIO_CRT2_DDC; if ((ret = setup_i2c_bus(&dev_priv->i2c[3], "crt2"))) return ret; return 0; } void radeon_delete_i2c_busses(drm_device_t *dev) { drm_radeon_private_t *dev_priv = dev->dev_private; int i, ret; for (i = 0; i < 4; i++) { if (dev_priv->i2c[i].dev) { ret = i2c_bit_del_bus(&dev_priv->i2c[i].adapter); } dev_priv->i2c[i].dev = NULL; } } #endif