diff options
Diffstat (limited to 'drivers/video/via/via_i2c.c')
| -rw-r--r-- | drivers/video/via/via_i2c.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/drivers/video/via/via_i2c.c b/drivers/video/via/via_i2c.c new file mode 100644 index 000000000000..0f3ed4eb236d --- /dev/null +++ b/drivers/video/via/via_i2c.c @@ -0,0 +1,177 @@ +/* + * Copyright 1998-2008 VIA Technologies, Inc. All Rights Reserved. + * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved. + + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; + * either version 2, or (at your option) any later version. + + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even + * the implied warranty of MERCHANTABILITY or FITNESS FOR + * A PARTICULAR PURPOSE.See the GNU General Public License + * for more details. + + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., + * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include "global.h" + +static void via_i2c_setscl(void *data, int state) +{ + u8 val; + struct via_i2c_stuff *via_i2c_chan = (struct via_i2c_stuff *)data; + + val = viafb_read_reg(VIASR, via_i2c_chan->i2c_port) & 0xF0; + if (state) + val |= 0x20; + else + val &= ~0x20; + switch (via_i2c_chan->i2c_port) { + case I2CPORTINDEX: + val |= 0x01; + break; + case GPIOPORTINDEX: + val |= 0x80; + break; + default: + DEBUG_MSG("via_i2c: specify wrong i2c port.\n"); + } + viafb_write_reg(via_i2c_chan->i2c_port, VIASR, val); +} + +static int via_i2c_getscl(void *data) +{ + struct via_i2c_stuff *via_i2c_chan = (struct via_i2c_stuff *)data; + + if (viafb_read_reg(VIASR, via_i2c_chan->i2c_port) & 0x08) + return 1; + return 0; +} + +static int via_i2c_getsda(void *data) +{ + struct via_i2c_stuff *via_i2c_chan = (struct via_i2c_stuff *)data; + + if (viafb_read_reg(VIASR, via_i2c_chan->i2c_port) & 0x04) + return 1; + return 0; +} + +static void via_i2c_setsda(void *data, int state) +{ + u8 val; + struct via_i2c_stuff *via_i2c_chan = (struct via_i2c_stuff *)data; + + val = viafb_read_reg(VIASR, via_i2c_chan->i2c_port) & 0xF0; + if (state) + val |= 0x10; + else + val &= ~0x10; + switch (via_i2c_chan->i2c_port) { + case I2CPORTINDEX: + val |= 0x01; + break; + case GPIOPORTINDEX: + val |= 0x40; + break; + default: + DEBUG_MSG("via_i2c: specify wrong i2c port.\n"); + } + viafb_write_reg(via_i2c_chan->i2c_port, VIASR, val); +} + +int viafb_i2c_readbyte(u8 slave_addr, u8 index, u8 *pdata) +{ + u8 mm1[] = {0x00}; + struct i2c_msg msgs[2]; + + *pdata = 0; + msgs[0].flags = 0; + msgs[1].flags = I2C_M_RD; + msgs[0].addr = msgs[1].addr = slave_addr / 2; + mm1[0] = index; + msgs[0].len = 1; msgs[1].len = 1; + msgs[0].buf = mm1; msgs[1].buf = pdata; + i2c_transfer(&viaparinfo->i2c_stuff.adapter, msgs, 2); + + return 0; +} + +int viafb_i2c_writebyte(u8 slave_addr, u8 index, u8 data) +{ + u8 msg[2] = { index, data }; + struct i2c_msg msgs; + + msgs.flags = 0; + msgs.addr = slave_addr / 2; + msgs.len = 2; + msgs.buf = msg; + return i2c_transfer(&viaparinfo->i2c_stuff.adapter, &msgs, 1); +} + +int viafb_i2c_readbytes(u8 slave_addr, u8 index, u8 *buff, int buff_len) +{ + u8 mm1[] = {0x00}; + struct i2c_msg msgs[2]; + + msgs[0].flags = 0; + msgs[1].flags = I2C_M_RD; + msgs[0].addr = msgs[1].addr = slave_addr / 2; + mm1[0] = index; + msgs[0].len = 1; msgs[1].len = buff_len; + msgs[0].buf = mm1; msgs[1].buf = buff; + i2c_transfer(&viaparinfo->i2c_stuff.adapter, msgs, 2); + return 0; +} + +int viafb_create_i2c_bus(void *viapar) +{ + int ret; + struct viafb_par *par = (struct viafb_par *)viapar; + + strcpy(par->i2c_stuff.adapter.name, "via_i2c"); + par->i2c_stuff.i2c_port = 0x0; + par->i2c_stuff.adapter.owner = THIS_MODULE; + par->i2c_stuff.adapter.id = 0x01FFFF; + par->i2c_stuff.adapter.class = 0; + par->i2c_stuff.adapter.algo_data = &par->i2c_stuff.algo; + par->i2c_stuff.adapter.dev.parent = NULL; + par->i2c_stuff.algo.setsda = via_i2c_setsda; + par->i2c_stuff.algo.setscl = via_i2c_setscl; + par->i2c_stuff.algo.getsda = via_i2c_getsda; + par->i2c_stuff.algo.getscl = via_i2c_getscl; + par->i2c_stuff.algo.udelay = 40; + par->i2c_stuff.algo.timeout = 20; + par->i2c_stuff.algo.data = &par->i2c_stuff; + + i2c_set_adapdata(&par->i2c_stuff.adapter, &par->i2c_stuff); + + /* Raise SCL and SDA */ + par->i2c_stuff.i2c_port = I2CPORTINDEX; + via_i2c_setsda(&par->i2c_stuff, 1); + via_i2c_setscl(&par->i2c_stuff, 1); + + par->i2c_stuff.i2c_port = GPIOPORTINDEX; + via_i2c_setsda(&par->i2c_stuff, 1); + via_i2c_setscl(&par->i2c_stuff, 1); + udelay(20); + + ret = i2c_bit_add_bus(&par->i2c_stuff.adapter); + if (ret == 0) + DEBUG_MSG("I2C bus %s registered.\n", + par->i2c_stuff.adapter.name); + else + DEBUG_MSG("Failed to register I2C bus %s.\n", + par->i2c_stuff.adapter.name); + return ret; +} + +void viafb_delete_i2c_buss(void *par) +{ + i2c_del_adapter(&((struct viafb_par *)par)->i2c_stuff.adapter); +} |