| /* |
| |
| cx88-vp3054-i2c.c -- support for the secondary I2C bus of the |
| DNTV Live! DVB-T Pro (VP-3054), wired as: |
| GPIO[0] -> SCL, GPIO[1] -> SDA |
| |
| (c) 2005 Chris Pascoe <c.pascoe@itee.uq.edu.au> |
| |
| 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 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; 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., 675 Mass Ave, Cambridge, MA 02139, USA. |
| |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| |
| #include <asm/io.h> |
| |
| #include "cx88.h" |
| #include "cx88-vp3054-i2c.h" |
| |
| MODULE_DESCRIPTION("driver for cx2388x VP3054 design"); |
| MODULE_AUTHOR("Chris Pascoe <c.pascoe@itee.uq.edu.au>"); |
| MODULE_LICENSE("GPL"); |
| |
| /* ----------------------------------------------------------------------- */ |
| |
| static void vp3054_bit_setscl(void *data, int state) |
| { |
| struct cx8802_dev *dev = data; |
| struct cx88_core *core = dev->core; |
| struct vp3054_i2c_state *vp3054_i2c = dev->vp3054; |
| |
| if (state) { |
| vp3054_i2c->state |= 0x0001; /* SCL high */ |
| vp3054_i2c->state &= ~0x0100; /* external pullup */ |
| } else { |
| vp3054_i2c->state &= ~0x0001; /* SCL low */ |
| vp3054_i2c->state |= 0x0100; /* drive pin */ |
| } |
| cx_write(MO_GP0_IO, 0x010000 | vp3054_i2c->state); |
| cx_read(MO_GP0_IO); |
| } |
| |
| static void vp3054_bit_setsda(void *data, int state) |
| { |
| struct cx8802_dev *dev = data; |
| struct cx88_core *core = dev->core; |
| struct vp3054_i2c_state *vp3054_i2c = dev->vp3054; |
| |
| if (state) { |
| vp3054_i2c->state |= 0x0002; /* SDA high */ |
| vp3054_i2c->state &= ~0x0200; /* tristate pin */ |
| } else { |
| vp3054_i2c->state &= ~0x0002; /* SDA low */ |
| vp3054_i2c->state |= 0x0200; /* drive pin */ |
| } |
| cx_write(MO_GP0_IO, 0x020000 | vp3054_i2c->state); |
| cx_read(MO_GP0_IO); |
| } |
| |
| static int vp3054_bit_getscl(void *data) |
| { |
| struct cx8802_dev *dev = data; |
| struct cx88_core *core = dev->core; |
| u32 state; |
| |
| state = cx_read(MO_GP0_IO); |
| return (state & 0x01) ? 1 : 0; |
| } |
| |
| static int vp3054_bit_getsda(void *data) |
| { |
| struct cx8802_dev *dev = data; |
| struct cx88_core *core = dev->core; |
| u32 state; |
| |
| state = cx_read(MO_GP0_IO); |
| return (state & 0x02) ? 1 : 0; |
| } |
| |
| /* ----------------------------------------------------------------------- */ |
| |
| static const struct i2c_algo_bit_data vp3054_i2c_algo_template = { |
| .setsda = vp3054_bit_setsda, |
| .setscl = vp3054_bit_setscl, |
| .getsda = vp3054_bit_getsda, |
| .getscl = vp3054_bit_getscl, |
| .udelay = 16, |
| .timeout = 200, |
| }; |
| |
| /* ----------------------------------------------------------------------- */ |
| |
| int vp3054_i2c_probe(struct cx8802_dev *dev) |
| { |
| struct cx88_core *core = dev->core; |
| struct vp3054_i2c_state *vp3054_i2c; |
| int rc; |
| |
| if (core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO) |
| return 0; |
| |
| vp3054_i2c = kzalloc(sizeof(*vp3054_i2c), GFP_KERNEL); |
| if (vp3054_i2c == NULL) |
| return -ENOMEM; |
| dev->vp3054 = vp3054_i2c; |
| |
| memcpy(&vp3054_i2c->algo, &vp3054_i2c_algo_template, |
| sizeof(vp3054_i2c->algo)); |
| |
| vp3054_i2c->adap.class |= I2C_CLASS_TV_DIGITAL; |
| |
| vp3054_i2c->adap.dev.parent = &dev->pci->dev; |
| strlcpy(vp3054_i2c->adap.name, core->name, |
| sizeof(vp3054_i2c->adap.name)); |
| vp3054_i2c->adap.owner = THIS_MODULE; |
| vp3054_i2c->adap.id = I2C_HW_B_CX2388x; |
| vp3054_i2c->algo.data = dev; |
| i2c_set_adapdata(&vp3054_i2c->adap, dev); |
| vp3054_i2c->adap.algo_data = &vp3054_i2c->algo; |
| |
| vp3054_bit_setscl(dev,1); |
| vp3054_bit_setsda(dev,1); |
| |
| rc = i2c_bit_add_bus(&vp3054_i2c->adap); |
| if (0 != rc) { |
| printk("%s: vp3054_i2c register FAILED\n", core->name); |
| |
| kfree(dev->vp3054); |
| dev->vp3054 = NULL; |
| } |
| |
| return rc; |
| } |
| |
| void vp3054_i2c_remove(struct cx8802_dev *dev) |
| { |
| struct vp3054_i2c_state *vp3054_i2c = dev->vp3054; |
| |
| if (vp3054_i2c == NULL || |
| dev->core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO) |
| return; |
| |
| i2c_del_adapter(&vp3054_i2c->adap); |
| kfree(vp3054_i2c); |
| } |
| |
| EXPORT_SYMBOL(vp3054_i2c_probe); |
| EXPORT_SYMBOL(vp3054_i2c_remove); |