diff options
Diffstat (limited to 'drivers/video/fbdev/riva/rivafb-i2c.c')
| -rw-r--r-- | drivers/video/fbdev/riva/rivafb-i2c.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/drivers/video/fbdev/riva/rivafb-i2c.c b/drivers/video/fbdev/riva/rivafb-i2c.c new file mode 100644 index 000000000000..6a183375ced1 --- /dev/null +++ b/drivers/video/fbdev/riva/rivafb-i2c.c @@ -0,0 +1,166 @@ +/* + * linux/drivers/video/riva/fbdev-i2c.c - nVidia i2c + * + * Maintained by Ani Joshi <ajoshi@shell.unixbox.com> + * + * Copyright 2004 Antonino A. Daplas <adaplas @pol.net> + * + * Based on radeonfb-i2c.c + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/pci.h> +#include <linux/fb.h> +#include <linux/jiffies.h> + +#include <asm/io.h> + +#include "rivafb.h" +#include "../edid.h" + +static void riva_gpio_setscl(void* data, int state) +{ + struct riva_i2c_chan *chan = data; + struct riva_par *par = chan->par; + u32 val; + + VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1); + val = VGA_RD08(par->riva.PCIO, 0x3d5) & 0xf0; + + if (state) + val |= 0x20; + else + val &= ~0x20; + + VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1); + VGA_WR08(par->riva.PCIO, 0x3d5, val | 0x1); +} + +static void riva_gpio_setsda(void* data, int state) +{ + struct riva_i2c_chan *chan = data; + struct riva_par *par = chan->par; + u32 val; + + VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1); + val = VGA_RD08(par->riva.PCIO, 0x3d5) & 0xf0; + + if (state) + val |= 0x10; + else + val &= ~0x10; + + VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base + 1); + VGA_WR08(par->riva.PCIO, 0x3d5, val | 0x1); +} + +static int riva_gpio_getscl(void* data) +{ + struct riva_i2c_chan *chan = data; + struct riva_par *par = chan->par; + u32 val = 0; + + VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base); + if (VGA_RD08(par->riva.PCIO, 0x3d5) & 0x04) + val = 1; + + return val; +} + +static int riva_gpio_getsda(void* data) +{ + struct riva_i2c_chan *chan = data; + struct riva_par *par = chan->par; + u32 val = 0; + + VGA_WR08(par->riva.PCIO, 0x3d4, chan->ddc_base); + if (VGA_RD08(par->riva.PCIO, 0x3d5) & 0x08) + val = 1; + + return val; +} + +static int riva_setup_i2c_bus(struct riva_i2c_chan *chan, const char *name, + unsigned int i2c_class) +{ + int rc; + + strcpy(chan->adapter.name, name); + chan->adapter.owner = THIS_MODULE; + chan->adapter.class = i2c_class; + chan->adapter.algo_data = &chan->algo; + chan->adapter.dev.parent = &chan->par->pdev->dev; + chan->algo.setsda = riva_gpio_setsda; + chan->algo.setscl = riva_gpio_setscl; + chan->algo.getsda = riva_gpio_getsda; + chan->algo.getscl = riva_gpio_getscl; + chan->algo.udelay = 40; + chan->algo.timeout = msecs_to_jiffies(2); + chan->algo.data = chan; + + i2c_set_adapdata(&chan->adapter, chan); + + /* Raise SCL and SDA */ + riva_gpio_setsda(chan, 1); + riva_gpio_setscl(chan, 1); + udelay(20); + + rc = i2c_bit_add_bus(&chan->adapter); + if (rc == 0) + dev_dbg(&chan->par->pdev->dev, "I2C bus %s registered.\n", name); + else { + dev_warn(&chan->par->pdev->dev, + "Failed to register I2C bus %s.\n", name); + chan->par = NULL; + } + + return rc; +} + +void riva_create_i2c_busses(struct riva_par *par) +{ + par->chan[0].par = par; + par->chan[1].par = par; + par->chan[2].par = par; + + par->chan[0].ddc_base = 0x36; + par->chan[1].ddc_base = 0x3e; + par->chan[2].ddc_base = 0x50; + riva_setup_i2c_bus(&par->chan[0], "BUS1", I2C_CLASS_HWMON); + riva_setup_i2c_bus(&par->chan[1], "BUS2", 0); + riva_setup_i2c_bus(&par->chan[2], "BUS3", 0); +} + +void riva_delete_i2c_busses(struct riva_par *par) +{ + int i; + + for (i = 0; i < 3; i++) { + if (!par->chan[i].par) + continue; + i2c_del_adapter(&par->chan[i].adapter); + par->chan[i].par = NULL; + } +} + +int riva_probe_i2c_connector(struct riva_par *par, int conn, u8 **out_edid) +{ + u8 *edid = NULL; + + if (par->chan[conn].par) + edid = fb_ddc_read(&par->chan[conn].adapter); + + if (out_edid) + *out_edid = edid; + if (!edid) + return 1; + + return 0; +} + |