diff options
Diffstat (limited to 'drivers/media/video/cx88/cx88-vp3054-i2c.c')
| -rw-r--r-- | drivers/media/video/cx88/cx88-vp3054-i2c.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/drivers/media/video/cx88/cx88-vp3054-i2c.c b/drivers/media/video/cx88/cx88-vp3054-i2c.c new file mode 100644 index 00000000000..751a754a45e --- /dev/null +++ b/drivers/media/video/cx88/cx88-vp3054-i2c.c @@ -0,0 +1,177 @@ +/* + + 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 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, + .mdelay = 10, + .timeout = 200, +}; + +/* ----------------------------------------------------------------------- */ + +static struct i2c_adapter vp3054_i2c_adap_template = { + .name = "cx2388x", + .owner = THIS_MODULE, + .id = I2C_HW_B_CX2388x, +}; + +static struct i2c_client vp3054_i2c_client_template = { + .name = "VP-3054", +}; + +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->adap, &vp3054_i2c_adap_template, + sizeof(vp3054_i2c->adap)); + memcpy(&vp3054_i2c->algo, &vp3054_i2c_algo_template, + sizeof(vp3054_i2c->algo)); + memcpy(&vp3054_i2c->client, &vp3054_i2c_client_template, + sizeof(vp3054_i2c->client)); + + 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->algo.data = dev; + i2c_set_adapdata(&vp3054_i2c->adap, dev); + vp3054_i2c->adap.algo_data = &vp3054_i2c->algo; + vp3054_i2c->client.adapter = &vp3054_i2c->adap; + + 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_bit_del_bus(&vp3054_i2c->adap); + kfree(vp3054_i2c); +} + +EXPORT_SYMBOL(vp3054_i2c_probe); +EXPORT_SYMBOL(vp3054_i2c_remove); |