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path: root/drivers/media/pci/cx88/cx88-vp3054-i2c.c
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Diffstat (limited to 'drivers/media/pci/cx88/cx88-vp3054-i2c.c')
-rw-r--r--drivers/media/pci/cx88/cx88-vp3054-i2c.c158
1 files changed, 158 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..deede6e25
--- /dev/null
+++ b/drivers/media/pci/cx88/cx88-vp3054-i2c.c
@@ -0,0 +1,158 @@
+/*
+
+ 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/slab.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;
+
+ vp3054_i2c->algo = vp3054_i2c_algo_template;
+
+ 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->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);