diff options
Diffstat (limited to 'drivers/media/radio/radio-aztech.c')
| -rw-r--r-- | drivers/media/radio/radio-aztech.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-aztech.c b/drivers/media/radio/radio-aztech.c new file mode 100644 index 0000000..96245d3 --- /dev/null +++ b/drivers/media/radio/radio-aztech.c @@ -0,0 +1,186 @@ +/* + * radio-aztech.c - Aztech radio card driver + * + * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@xs4all.nl> + * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org> + * Adapted to support the Video for Linux API by + * Russell Kroll <rkroll@exploits.org>. Based on original tuner code by: + * + * Quay Ly + * Donald Song + * Jason Lewis (jlewis@twilight.vtc.vsc.edu) + * Scott McGrath (smcgrath@twilight.vtc.vsc.edu) + * William McGrath (wmcgrath@twilight.vtc.vsc.edu) + * + * Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool. +*/ + +#include <linux/module.h> /* Modules */ +#include <linux/init.h> /* Initdata */ +#include <linux/ioport.h> /* request_region */ +#include <linux/delay.h> /* udelay */ +#include <linux/videodev2.h> /* kernel radio structs */ +#include <linux/io.h> /* outb, outb_p */ +#include <linux/slab.h> +#include <media/v4l2-device.h> +#include <media/v4l2-ioctl.h> +#include <media/v4l2-ctrls.h> +#include "radio-isa.h" + +MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath"); +MODULE_DESCRIPTION("A driver for the Aztech radio card."); +MODULE_LICENSE("GPL"); +MODULE_VERSION("1.0.0"); + +/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */ +#ifndef CPTCFG_RADIO_AZTECH_PORT +#define CPTCFG_RADIO_AZTECH_PORT -1 +#endif + +#define AZTECH_MAX 2 + +static int io[AZTECH_MAX] = { [0] = CPTCFG_RADIO_AZTECH_PORT, + [1 ... (AZTECH_MAX - 1)] = -1 }; +static int radio_nr[AZTECH_MAX] = { [0 ... (AZTECH_MAX - 1)] = -1 }; +static const int radio_wait_time = 1000; + +module_param_array(io, int, NULL, 0444); +MODULE_PARM_DESC(io, "I/O addresses of the Aztech card (0x350 or 0x358)"); +module_param_array(radio_nr, int, NULL, 0444); +MODULE_PARM_DESC(radio_nr, "Radio device numbers"); + +struct aztech { + struct radio_isa_card isa; + int curvol; +}; + +static void send_0_byte(struct aztech *az) +{ + udelay(radio_wait_time); + outb_p(2 + az->curvol, az->isa.io); + outb_p(64 + 2 + az->curvol, az->isa.io); +} + +static void send_1_byte(struct aztech *az) +{ + udelay(radio_wait_time); + outb_p(128 + 2 + az->curvol, az->isa.io); + outb_p(128 + 64 + 2 + az->curvol, az->isa.io); +} + +static struct radio_isa_card *aztech_alloc(void) +{ + struct aztech *az = kzalloc(sizeof(*az), GFP_KERNEL); + + return az ? &az->isa : NULL; +} + +static int aztech_s_frequency(struct radio_isa_card *isa, u32 freq) +{ + struct aztech *az = container_of(isa, struct aztech, isa); + int i; + + freq += 171200; /* Add 10.7 MHz IF */ + freq /= 800; /* Convert to 50 kHz units */ + + send_0_byte(az); /* 0: LSB of frequency */ + + for (i = 0; i < 13; i++) /* : frequency bits (1-13) */ + if (freq & (1 << i)) + send_1_byte(az); + else + send_0_byte(az); + + send_0_byte(az); /* 14: test bit - always 0 */ + send_0_byte(az); /* 15: test bit - always 0 */ + send_0_byte(az); /* 16: band data 0 - always 0 */ + if (isa->stereo) /* 17: stereo (1 to enable) */ + send_1_byte(az); + else + send_0_byte(az); + + send_1_byte(az); /* 18: band data 1 - unknown */ + send_0_byte(az); /* 19: time base - always 0 */ + send_0_byte(az); /* 20: spacing (0 = 25 kHz) */ + send_1_byte(az); /* 21: spacing (1 = 25 kHz) */ + send_0_byte(az); /* 22: spacing (0 = 25 kHz) */ + send_1_byte(az); /* 23: AM/FM (FM = 1, always) */ + + /* latch frequency */ + + udelay(radio_wait_time); + outb_p(128 + 64 + az->curvol, az->isa.io); + + return 0; +} + +/* thanks to Michael Dwyer for giving me a dose of clues in + * the signal strength department.. + * + * This card has a stereo bit - bit 0 set = mono, not set = stereo + */ +static u32 aztech_g_rxsubchans(struct radio_isa_card *isa) +{ + if (inb(isa->io) & 1) + return V4L2_TUNER_SUB_MONO; + return V4L2_TUNER_SUB_STEREO; +} + +static int aztech_s_stereo(struct radio_isa_card *isa, bool stereo) +{ + return aztech_s_frequency(isa, isa->freq); +} + +static int aztech_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol) +{ + struct aztech *az = container_of(isa, struct aztech, isa); + + if (mute) + vol = 0; + az->curvol = (vol & 1) + ((vol & 2) << 1); + outb(az->curvol, isa->io); + return 0; +} + +static const struct radio_isa_ops aztech_ops = { + .alloc = aztech_alloc, + .s_mute_volume = aztech_s_mute_volume, + .s_frequency = aztech_s_frequency, + .s_stereo = aztech_s_stereo, + .g_rxsubchans = aztech_g_rxsubchans, +}; + +static const int aztech_ioports[] = { 0x350, 0x358 }; + +static struct radio_isa_driver aztech_driver = { + .driver = { + .match = radio_isa_match, + .probe = radio_isa_probe, + .remove = radio_isa_remove, + .driver = { + .name = "radio-aztech", + }, + }, + .io_params = io, + .radio_nr_params = radio_nr, + .io_ports = aztech_ioports, + .num_of_io_ports = ARRAY_SIZE(aztech_ioports), + .region_size = 2, + .card = "Aztech Radio", + .ops = &aztech_ops, + .has_stereo = true, + .max_volume = 3, +}; + +static int __init aztech_init(void) +{ + return isa_register_driver(&aztech_driver.driver, AZTECH_MAX); +} + +static void __exit aztech_exit(void) +{ + isa_unregister_driver(&aztech_driver.driver); +} + +module_init(aztech_init); +module_exit(aztech_exit); |