diff options
Diffstat (limited to 'drivers/media/pci/cx88/cx88-vp3054-i2c.c')
| -rw-r--r-- | drivers/media/pci/cx88/cx88-vp3054-i2c.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/drivers/media/pci/cx88/cx88-vp3054-i2c.c b/drivers/media/pci/cx88/cx88-vp3054-i2c.c new file mode 100644 index 000000000..ac7f76dc5 --- /dev/null +++ b/drivers/media/pci/cx88/cx88-vp3054-i2c.c @@ -0,0 +1,141 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * 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> + */ + +#include "cx88.h" +#include "cx88-vp3054-i2c.h" + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/io.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) + return -ENOMEM; + dev->vp3054 = vp3054_i2c; + + vp3054_i2c->algo = vp3054_i2c_algo_template; + + vp3054_i2c->adap.dev.parent = &dev->pci->dev; + strscpy(vp3054_i2c->adap.name, core->name, + sizeof(vp3054_i2c->adap.name)); + vp3054_i2c->adap.owner = THIS_MODULE; + 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 (rc != 0) { + pr_err("vp3054_i2c register FAILED\n"); + + kfree(dev->vp3054); + dev->vp3054 = NULL; + } + + return rc; +} +EXPORT_SYMBOL(vp3054_i2c_probe); + +void vp3054_i2c_remove(struct cx8802_dev *dev) +{ + struct vp3054_i2c_state *vp3054_i2c = dev->vp3054; + + if (!vp3054_i2c || + dev->core->boardnr != CX88_BOARD_DNTV_LIVE_DVB_T_PRO) + return; + + i2c_del_adapter(&vp3054_i2c->adap); + kfree(vp3054_i2c); +} +EXPORT_SYMBOL(vp3054_i2c_remove); |