diff options
Diffstat (limited to 'drivers/video/fbdev/aty/radeon_i2c.c')
| -rw-r--r-- | drivers/video/fbdev/aty/radeon_i2c.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/drivers/video/fbdev/aty/radeon_i2c.c b/drivers/video/fbdev/aty/radeon_i2c.c new file mode 100644 index 000000000..269b12ebb --- /dev/null +++ b/drivers/video/fbdev/aty/radeon_i2c.c @@ -0,0 +1,168 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "radeonfb.h" + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/fb.h> + + +#include <linux/i2c.h> +#include <linux/i2c-algo-bit.h> + +#include <asm/io.h> + +#include <video/radeon.h> +#include "../edid.h" + +static void radeon_gpio_setscl(void* data, int state) +{ + struct radeon_i2c_chan *chan = data; + struct radeonfb_info *rinfo = chan->rinfo; + u32 val; + + val = INREG(chan->ddc_reg) & ~(VGA_DDC_CLK_OUT_EN); + if (!state) + val |= VGA_DDC_CLK_OUT_EN; + + OUTREG(chan->ddc_reg, val); + (void)INREG(chan->ddc_reg); +} + +static void radeon_gpio_setsda(void* data, int state) +{ + struct radeon_i2c_chan *chan = data; + struct radeonfb_info *rinfo = chan->rinfo; + u32 val; + + val = INREG(chan->ddc_reg) & ~(VGA_DDC_DATA_OUT_EN); + if (!state) + val |= VGA_DDC_DATA_OUT_EN; + + OUTREG(chan->ddc_reg, val); + (void)INREG(chan->ddc_reg); +} + +static int radeon_gpio_getscl(void* data) +{ + struct radeon_i2c_chan *chan = data; + struct radeonfb_info *rinfo = chan->rinfo; + u32 val; + + val = INREG(chan->ddc_reg); + + return (val & VGA_DDC_CLK_INPUT) ? 1 : 0; +} + +static int radeon_gpio_getsda(void* data) +{ + struct radeon_i2c_chan *chan = data; + struct radeonfb_info *rinfo = chan->rinfo; + u32 val; + + val = INREG(chan->ddc_reg); + + return (val & VGA_DDC_DATA_INPUT) ? 1 : 0; +} + +static int radeon_setup_i2c_bus(struct radeon_i2c_chan *chan, const char *name) +{ + int rc; + + snprintf(chan->adapter.name, sizeof(chan->adapter.name), + "radeonfb %s", name); + chan->adapter.owner = THIS_MODULE; + chan->adapter.algo_data = &chan->algo; + chan->adapter.dev.parent = &chan->rinfo->pdev->dev; + chan->algo.setsda = radeon_gpio_setsda; + chan->algo.setscl = radeon_gpio_setscl; + chan->algo.getsda = radeon_gpio_getsda; + chan->algo.getscl = radeon_gpio_getscl; + chan->algo.udelay = 10; + chan->algo.timeout = 20; + chan->algo.data = chan; + + i2c_set_adapdata(&chan->adapter, chan); + + /* Raise SCL and SDA */ + radeon_gpio_setsda(chan, 1); + radeon_gpio_setscl(chan, 1); + udelay(20); + + rc = i2c_bit_add_bus(&chan->adapter); + if (rc == 0) + dev_dbg(&chan->rinfo->pdev->dev, "I2C bus %s registered.\n", name); + else + dev_warn(&chan->rinfo->pdev->dev, "Failed to register I2C bus %s.\n", name); + return rc; +} + +void radeon_create_i2c_busses(struct radeonfb_info *rinfo) +{ + rinfo->i2c[0].rinfo = rinfo; + rinfo->i2c[0].ddc_reg = GPIO_MONID; +#ifndef CONFIG_PPC + rinfo->i2c[0].adapter.class = I2C_CLASS_HWMON; +#endif + radeon_setup_i2c_bus(&rinfo->i2c[0], "monid"); + + rinfo->i2c[1].rinfo = rinfo; + rinfo->i2c[1].ddc_reg = GPIO_DVI_DDC; + radeon_setup_i2c_bus(&rinfo->i2c[1], "dvi"); + + rinfo->i2c[2].rinfo = rinfo; + rinfo->i2c[2].ddc_reg = GPIO_VGA_DDC; + radeon_setup_i2c_bus(&rinfo->i2c[2], "vga"); + + rinfo->i2c[3].rinfo = rinfo; + rinfo->i2c[3].ddc_reg = GPIO_CRT2_DDC; + radeon_setup_i2c_bus(&rinfo->i2c[3], "crt2"); +} + +void radeon_delete_i2c_busses(struct radeonfb_info *rinfo) +{ + if (rinfo->i2c[0].rinfo) + i2c_del_adapter(&rinfo->i2c[0].adapter); + rinfo->i2c[0].rinfo = NULL; + + if (rinfo->i2c[1].rinfo) + i2c_del_adapter(&rinfo->i2c[1].adapter); + rinfo->i2c[1].rinfo = NULL; + + if (rinfo->i2c[2].rinfo) + i2c_del_adapter(&rinfo->i2c[2].adapter); + rinfo->i2c[2].rinfo = NULL; + + if (rinfo->i2c[3].rinfo) + i2c_del_adapter(&rinfo->i2c[3].adapter); + rinfo->i2c[3].rinfo = NULL; +} + +int radeon_probe_i2c_connector(struct radeonfb_info *rinfo, int conn, + u8 **out_edid) +{ + u8 *edid; + + edid = fb_ddc_read(&rinfo->i2c[conn-1].adapter); + + if (out_edid) + *out_edid = edid; + if (!edid) { + pr_debug("radeonfb: I2C (port %d) ... not found\n", conn); + return MT_NONE; + } + if (edid[0x14] & 0x80) { + /* Fix detection using BIOS tables */ + if (rinfo->is_mobility /*&& conn == ddc_dvi*/ && + (INREG(LVDS_GEN_CNTL) & LVDS_ON)) { + pr_debug("radeonfb: I2C (port %d) ... found LVDS panel\n", conn); + return MT_LCD; + } else { + pr_debug("radeonfb: I2C (port %d) ... found TMDS panel\n", conn); + return MT_DFP; + } + } + pr_debug("radeonfb: I2C (port %d) ... found CRT display\n", conn); + return MT_CRT; +} + |