/* 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/moduleparam.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->card_priv; 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->card_priv; 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->board != CX88_BOARD_DNTV_LIVE_DVB_T_PRO) return 0; dev->card_priv = kzalloc(sizeof(*vp3054_i2c), GFP_KERNEL); if (dev->card_priv == NULL) return -ENOMEM; vp3054_i2c = dev->card_priv; 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->card_priv); dev->card_priv = NULL; } return rc; } void vp3054_i2c_remove(struct cx8802_dev *dev) { struct vp3054_i2c_state *vp3054_i2c = dev->card_priv; if (vp3054_i2c == NULL || dev->core->board != 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);