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>

diff --git a/drivers/staging/lirc/lirc_bt829.c b/drivers/staging/lirc/lirc_bt829.c
new file mode 100644 (file)
index 0000000..d0f34b5
--- /dev/null
+++ b/drivers/staging/lirc/lirc_bt829.c
@@ -0,0 +1,383 @@
+/*
+ * Remote control driver for the TV-card based on bt829
+ *
+ *  by Leonid Froenchenko <lfroen@galileo.co.il>
+ *
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/threads.h>
+#include <linux/sched.h>
+#include <linux/ioport.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+
+#include <media/lirc_dev.h>
+
+static int poll_main(void);
+static int atir_init_start(void);
+
+static void write_index(unsigned char index, unsigned int value);
+static unsigned int read_index(unsigned char index);
+
+static void do_i2c_start(void);
+static void do_i2c_stop(void);
+
+static void seems_wr_byte(unsigned char al);
+static unsigned char seems_rd_byte(void);
+
+static unsigned int read_index(unsigned char al);
+static void write_index(unsigned char ah, unsigned int edx);
+
+static void cycle_delay(int cycle);
+
+static void do_set_bits(unsigned char bl);
+static unsigned char do_get_bits(void);
+
+#define DATA_PCI_OFF 0x7FFC00
+#define WAIT_CYCLE   20
+
+#define DRIVER_NAME "lirc_bt829"
+
+static int debug;
+#define dprintk(fmt, args...)                                           \
+       do {                                                             \
+               if (debug)                                               \
+                       printk(KERN_DEBUG DRIVER_NAME ": "fmt, ## args); \
+       } while (0)
+
+static int atir_minor;
+static unsigned long pci_addr_phys;
+static unsigned char *pci_addr_lin;
+
+static struct lirc_driver atir_driver;
+
+static struct pci_dev *do_pci_probe(void)
+{
+       struct pci_dev *my_dev;
+       my_dev = pci_get_device(PCI_VENDOR_ID_ATI,
+                               PCI_DEVICE_ID_ATI_264VT, NULL);
+       if (my_dev) {
+               printk(KERN_ERR DRIVER_NAME ": Using device: %s\n",
+                      pci_name(my_dev));
+               pci_addr_phys = 0;
+               if (my_dev->resource[0].flags & IORESOURCE_MEM) {
+                       pci_addr_phys = my_dev->resource[0].start;
+                       printk(KERN_INFO DRIVER_NAME ": memory at 0x%08X \n",
+                              (unsigned int)pci_addr_phys);
+               }
+               if (pci_addr_phys == 0) {
+                       printk(KERN_ERR DRIVER_NAME ": no memory resource ?\n");
+                       return NULL;
+               }
+       } else {
+               printk(KERN_ERR DRIVER_NAME ": pci_probe failed\n");
+               return NULL;
+       }
+       return my_dev;
+}
+
+static int atir_add_to_buf(void *data, struct lirc_buffer *buf)
+{
+       unsigned char key;
+       int status;
+       status = poll_main();
+       key = (status >> 8) & 0xFF;
+       if (status & 0xFF) {
+               dprintk("reading key %02X\n", key);
+               lirc_buffer_write(buf, &key);
+               return 0;
+       }
+       return -ENODATA;
+}
+
+static int atir_set_use_inc(void *data)
+{
+       dprintk("driver is opened\n");
+       return 0;
+}
+
+static void atir_set_use_dec(void *data)
+{
+       dprintk("driver is closed\n");
+}
+
+int init_module(void)
+{
+       struct pci_dev *pdev;
+
+       pdev = do_pci_probe();
+       if (pdev == NULL)
+               return 1;
+
+       if (!atir_init_start())
+               return 1;
+
+       strcpy(atir_driver.name, "ATIR");
+       atir_driver.minor       = -1;
+       atir_driver.code_length = 8;
+       atir_driver.sample_rate = 10;
+       atir_driver.data        = 0;
+       atir_driver.add_to_buf  = atir_add_to_buf;
+       atir_driver.set_use_inc = atir_set_use_inc;
+       atir_driver.set_use_dec = atir_set_use_dec;
+       atir_driver.dev         = &pdev->dev;
+       atir_driver.owner       = THIS_MODULE;
+
+       atir_minor = lirc_register_driver(&atir_driver);
+       if (atir_minor < 0) {
+               printk(KERN_ERR DRIVER_NAME ": failed to register driver!\n");
+               return atir_minor;
+       }
+       dprintk("driver is registered on minor %d\n", atir_minor);
+
+       return 0;
+}
+
+
+void cleanup_module(void)
+{
+       lirc_unregister_driver(atir_minor);
+}
+
+
+static int atir_init_start(void)
+{
+       pci_addr_lin = ioremap(pci_addr_phys + DATA_PCI_OFF, 0x400);
+       if (pci_addr_lin == 0) {
+               printk(KERN_INFO DRIVER_NAME ": pci mem must be mapped\n");
+               return 0;
+       }
+       return 1;
+}
+
+static void cycle_delay(int cycle)
+{
+       udelay(WAIT_CYCLE*cycle);
+}
+
+
+static int poll_main()
+{
+       unsigned char status_high, status_low;
+
+       do_i2c_start();
+
+       seems_wr_byte(0xAA);
+       seems_wr_byte(0x01);
+
+       do_i2c_start();
+
+       seems_wr_byte(0xAB);
+
+       status_low = seems_rd_byte();
+       status_high = seems_rd_byte();
+
+       do_i2c_stop();
+
+       return (status_high << 8) | status_low;
+}
+
+static void do_i2c_start(void)
+{
+       do_set_bits(3);
+       cycle_delay(4);
+
+       do_set_bits(1);
+       cycle_delay(7);
+
+       do_set_bits(0);
+       cycle_delay(2);
+}
+
+static void do_i2c_stop(void)
+{
+       unsigned char bits;
+       bits =  do_get_bits() & 0xFD;
+       do_set_bits(bits);
+       cycle_delay(1);
+
+       bits |= 1;
+       do_set_bits(bits);
+       cycle_delay(2);
+
+       bits |= 2;
+       do_set_bits(bits);
+       bits = 3;
+       do_set_bits(bits);
+       cycle_delay(2);
+}
+
+static void seems_wr_byte(unsigned char value)
+{
+       int i;
+       unsigned char reg;
+
+       reg = do_get_bits();
+       for (i = 0; i < 8; i++) {
+               if (value & 0x80)
+                       reg |= 0x02;
+               else
+                       reg &= 0xFD;
+
+               do_set_bits(reg);
+               cycle_delay(1);
+
+               reg |= 1;
+               do_set_bits(reg);
+               cycle_delay(1);
+
+               reg &= 0xFE;
+               do_set_bits(reg);
+               cycle_delay(1);
+               value <<= 1;
+       }
+       cycle_delay(2);
+
+       reg |= 2;
+       do_set_bits(reg);
+
+       reg |= 1;
+       do_set_bits(reg);
+
+       cycle_delay(1);
+       do_get_bits();
+
+       reg &= 0xFE;
+       do_set_bits(reg);
+       cycle_delay(3);
+}
+
+static unsigned char seems_rd_byte(void)
+{
+       int i;
+       int rd_byte;
+       unsigned char bits_2, bits_1;
+
+       bits_1 = do_get_bits() | 2;
+       do_set_bits(bits_1);
+
+       rd_byte = 0;
+       for (i = 0; i < 8; i++) {
+               bits_1 &= 0xFE;
+               do_set_bits(bits_1);
+               cycle_delay(2);
+
+               bits_1 |= 1;
+               do_set_bits(bits_1);
+               cycle_delay(1);
+
+               bits_2 = do_get_bits();
+               if (bits_2 & 2)
+                       rd_byte |= 1;
+
+               rd_byte <<= 1;
+       }
+
+       bits_1 = 0;
+       if (bits_2 == 0)
+               bits_1 |= 2;
+
+       do_set_bits(bits_1);
+       cycle_delay(2);
+
+       bits_1 |= 1;
+       do_set_bits(bits_1);
+       cycle_delay(3);
+
+       bits_1 &= 0xFE;
+       do_set_bits(bits_1);
+       cycle_delay(2);
+
+       rd_byte >>= 1;
+       rd_byte &= 0xFF;
+       return rd_byte;
+}
+
+static void do_set_bits(unsigned char new_bits)
+{
+       int reg_val;
+       reg_val = read_index(0x34);
+       if (new_bits & 2) {
+               reg_val &= 0xFFFFFFDF;
+               reg_val |= 1;
+       } else {
+               reg_val &= 0xFFFFFFFE;
+               reg_val |= 0x20;
+       }
+       reg_val |= 0x10;
+       write_index(0x34, reg_val);
+
+       reg_val = read_index(0x31);
+       if (new_bits & 1)
+               reg_val |= 0x1000000;
+       else
+               reg_val &= 0xFEFFFFFF;
+
+       reg_val |= 0x8000000;
+       write_index(0x31, reg_val);
+}
+
+static unsigned char do_get_bits(void)
+{
+       unsigned char bits;
+       int reg_val;
+
+       reg_val = read_index(0x34);
+       reg_val |= 0x10;
+       reg_val &= 0xFFFFFFDF;
+       write_index(0x34, reg_val);
+
+       reg_val = read_index(0x34);
+       bits = 0;
+       if (reg_val & 8)
+               bits |= 2;
+       else
+               bits &= 0xFD;
+
+       reg_val = read_index(0x31);
+       if (reg_val & 0x1000000)
+               bits |= 1;
+       else
+               bits &= 0xFE;
+
+       return bits;
+}
+
+static unsigned int read_index(unsigned char index)
+{
+       unsigned char *addr;
+       unsigned int value;
+       /*  addr = pci_addr_lin + DATA_PCI_OFF + ((index & 0xFF) << 2); */
+       addr = pci_addr_lin + ((index & 0xFF) << 2);
+       value = readl(addr);
+       return value;
+}
+
+static void write_index(unsigned char index, unsigned int reg_val)
+{
+       unsigned char *addr;
+       addr = pci_addr_lin + ((index & 0xFF) << 2);
+       writel(reg_val, addr);
+}
+
+MODULE_AUTHOR("Froenchenko Leonid");
+MODULE_DESCRIPTION("IR remote driver for bt829 based TV cards");
+MODULE_LICENSE("GPL");
+
+module_param(debug, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(debug, "Debug enabled or not");