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V4L/DVB: staging/lirc: add lirc_bt829 driver
Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Jarod Wilson
Mauro Carvalho Chehab
parent
17f93e1e3b
commit
d10d634143
383
drivers/staging/lirc/lirc_bt829.c
Normal file
383
drivers/staging/lirc/lirc_bt829.c
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@ -0,0 +1,383 @@
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/*
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* Remote control driver for the TV-card based on bt829
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*
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* by Leonid Froenchenko <lfroen@galileo.co.il>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/threads.h>
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#include <linux/sched.h>
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#include <linux/ioport.h>
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <media/lirc_dev.h>
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static int poll_main(void);
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static int atir_init_start(void);
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static void write_index(unsigned char index, unsigned int value);
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static unsigned int read_index(unsigned char index);
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static void do_i2c_start(void);
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static void do_i2c_stop(void);
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static void seems_wr_byte(unsigned char al);
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static unsigned char seems_rd_byte(void);
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static unsigned int read_index(unsigned char al);
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static void write_index(unsigned char ah, unsigned int edx);
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static void cycle_delay(int cycle);
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static void do_set_bits(unsigned char bl);
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static unsigned char do_get_bits(void);
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#define DATA_PCI_OFF 0x7FFC00
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#define WAIT_CYCLE 20
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#define DRIVER_NAME "lirc_bt829"
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static int debug;
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#define dprintk(fmt, args...) \
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do { \
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if (debug) \
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printk(KERN_DEBUG DRIVER_NAME ": "fmt, ## args); \
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} while (0)
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static int atir_minor;
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static unsigned long pci_addr_phys;
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static unsigned char *pci_addr_lin;
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static struct lirc_driver atir_driver;
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static struct pci_dev *do_pci_probe(void)
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{
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struct pci_dev *my_dev;
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my_dev = pci_get_device(PCI_VENDOR_ID_ATI,
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PCI_DEVICE_ID_ATI_264VT, NULL);
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if (my_dev) {
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printk(KERN_ERR DRIVER_NAME ": Using device: %s\n",
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pci_name(my_dev));
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pci_addr_phys = 0;
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if (my_dev->resource[0].flags & IORESOURCE_MEM) {
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pci_addr_phys = my_dev->resource[0].start;
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printk(KERN_INFO DRIVER_NAME ": memory at 0x%08X \n",
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(unsigned int)pci_addr_phys);
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}
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if (pci_addr_phys == 0) {
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printk(KERN_ERR DRIVER_NAME ": no memory resource ?\n");
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return NULL;
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}
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} else {
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printk(KERN_ERR DRIVER_NAME ": pci_probe failed\n");
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return NULL;
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}
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return my_dev;
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}
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static int atir_add_to_buf(void *data, struct lirc_buffer *buf)
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{
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unsigned char key;
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int status;
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status = poll_main();
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key = (status >> 8) & 0xFF;
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if (status & 0xFF) {
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dprintk("reading key %02X\n", key);
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lirc_buffer_write(buf, &key);
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return 0;
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}
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return -ENODATA;
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}
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static int atir_set_use_inc(void *data)
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{
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dprintk("driver is opened\n");
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return 0;
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}
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static void atir_set_use_dec(void *data)
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{
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dprintk("driver is closed\n");
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}
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int init_module(void)
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{
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struct pci_dev *pdev;
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pdev = do_pci_probe();
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if (pdev == NULL)
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return 1;
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if (!atir_init_start())
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return 1;
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strcpy(atir_driver.name, "ATIR");
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atir_driver.minor = -1;
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atir_driver.code_length = 8;
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atir_driver.sample_rate = 10;
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atir_driver.data = 0;
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atir_driver.add_to_buf = atir_add_to_buf;
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atir_driver.set_use_inc = atir_set_use_inc;
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atir_driver.set_use_dec = atir_set_use_dec;
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atir_driver.dev = &pdev->dev;
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atir_driver.owner = THIS_MODULE;
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atir_minor = lirc_register_driver(&atir_driver);
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if (atir_minor < 0) {
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printk(KERN_ERR DRIVER_NAME ": failed to register driver!\n");
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return atir_minor;
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}
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dprintk("driver is registered on minor %d\n", atir_minor);
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return 0;
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}
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void cleanup_module(void)
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{
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lirc_unregister_driver(atir_minor);
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}
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static int atir_init_start(void)
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{
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pci_addr_lin = ioremap(pci_addr_phys + DATA_PCI_OFF, 0x400);
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if (pci_addr_lin == 0) {
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printk(KERN_INFO DRIVER_NAME ": pci mem must be mapped\n");
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return 0;
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}
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return 1;
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}
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static void cycle_delay(int cycle)
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{
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udelay(WAIT_CYCLE*cycle);
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}
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static int poll_main()
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{
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unsigned char status_high, status_low;
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do_i2c_start();
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seems_wr_byte(0xAA);
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seems_wr_byte(0x01);
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do_i2c_start();
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seems_wr_byte(0xAB);
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status_low = seems_rd_byte();
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status_high = seems_rd_byte();
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do_i2c_stop();
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return (status_high << 8) | status_low;
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}
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static void do_i2c_start(void)
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{
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do_set_bits(3);
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cycle_delay(4);
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do_set_bits(1);
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cycle_delay(7);
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do_set_bits(0);
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cycle_delay(2);
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}
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static void do_i2c_stop(void)
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{
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unsigned char bits;
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bits = do_get_bits() & 0xFD;
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do_set_bits(bits);
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cycle_delay(1);
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bits |= 1;
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do_set_bits(bits);
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cycle_delay(2);
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bits |= 2;
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do_set_bits(bits);
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bits = 3;
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do_set_bits(bits);
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cycle_delay(2);
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}
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static void seems_wr_byte(unsigned char value)
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{
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int i;
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unsigned char reg;
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reg = do_get_bits();
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for (i = 0; i < 8; i++) {
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if (value & 0x80)
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reg |= 0x02;
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else
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reg &= 0xFD;
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do_set_bits(reg);
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cycle_delay(1);
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reg |= 1;
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do_set_bits(reg);
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cycle_delay(1);
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reg &= 0xFE;
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do_set_bits(reg);
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cycle_delay(1);
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value <<= 1;
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}
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cycle_delay(2);
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reg |= 2;
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do_set_bits(reg);
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reg |= 1;
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do_set_bits(reg);
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cycle_delay(1);
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do_get_bits();
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reg &= 0xFE;
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do_set_bits(reg);
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cycle_delay(3);
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}
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static unsigned char seems_rd_byte(void)
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{
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int i;
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int rd_byte;
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unsigned char bits_2, bits_1;
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bits_1 = do_get_bits() | 2;
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do_set_bits(bits_1);
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rd_byte = 0;
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for (i = 0; i < 8; i++) {
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bits_1 &= 0xFE;
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do_set_bits(bits_1);
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cycle_delay(2);
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bits_1 |= 1;
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do_set_bits(bits_1);
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cycle_delay(1);
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bits_2 = do_get_bits();
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if (bits_2 & 2)
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rd_byte |= 1;
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rd_byte <<= 1;
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}
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bits_1 = 0;
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if (bits_2 == 0)
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bits_1 |= 2;
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do_set_bits(bits_1);
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cycle_delay(2);
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bits_1 |= 1;
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do_set_bits(bits_1);
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cycle_delay(3);
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bits_1 &= 0xFE;
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do_set_bits(bits_1);
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cycle_delay(2);
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rd_byte >>= 1;
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rd_byte &= 0xFF;
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return rd_byte;
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}
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static void do_set_bits(unsigned char new_bits)
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{
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int reg_val;
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reg_val = read_index(0x34);
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if (new_bits & 2) {
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reg_val &= 0xFFFFFFDF;
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reg_val |= 1;
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} else {
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reg_val &= 0xFFFFFFFE;
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reg_val |= 0x20;
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}
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reg_val |= 0x10;
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write_index(0x34, reg_val);
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reg_val = read_index(0x31);
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if (new_bits & 1)
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reg_val |= 0x1000000;
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else
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reg_val &= 0xFEFFFFFF;
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reg_val |= 0x8000000;
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write_index(0x31, reg_val);
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}
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static unsigned char do_get_bits(void)
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{
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unsigned char bits;
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int reg_val;
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reg_val = read_index(0x34);
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reg_val |= 0x10;
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reg_val &= 0xFFFFFFDF;
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write_index(0x34, reg_val);
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reg_val = read_index(0x34);
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bits = 0;
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if (reg_val & 8)
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bits |= 2;
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else
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bits &= 0xFD;
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reg_val = read_index(0x31);
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if (reg_val & 0x1000000)
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bits |= 1;
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else
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bits &= 0xFE;
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return bits;
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}
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static unsigned int read_index(unsigned char index)
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{
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unsigned char *addr;
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unsigned int value;
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/* addr = pci_addr_lin + DATA_PCI_OFF + ((index & 0xFF) << 2); */
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addr = pci_addr_lin + ((index & 0xFF) << 2);
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value = readl(addr);
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return value;
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}
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static void write_index(unsigned char index, unsigned int reg_val)
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{
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unsigned char *addr;
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addr = pci_addr_lin + ((index & 0xFF) << 2);
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writel(reg_val, addr);
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}
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MODULE_AUTHOR("Froenchenko Leonid");
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MODULE_DESCRIPTION("IR remote driver for bt829 based TV cards");
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MODULE_LICENSE("GPL");
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module_param(debug, bool, S_IRUGO | S_IWUSR);
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MODULE_PARM_DESC(debug, "Debug enabled or not");
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