diff options
Diffstat (limited to 'drivers/media/radio/radio-aztech.c')
| -rw-r--r-- | drivers/media/radio/radio-aztech.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-aztech.c b/drivers/media/radio/radio-aztech.c new file mode 100644 index 000000000..4909c337b --- /dev/null +++ b/drivers/media/radio/radio-aztech.c @@ -0,0 +1,161 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 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@kernel.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" +#include "lm7000.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 CONFIG_RADIO_AZTECH_PORT +#define CONFIG_RADIO_AZTECH_PORT -1 +#endif + +#define AZTECH_MAX 2 + +static int io[AZTECH_MAX] = { [0] = CONFIG_RADIO_AZTECH_PORT, + [1 ... (AZTECH_MAX - 1)] = -1 }; +static int radio_nr[AZTECH_MAX] = { [0 ... (AZTECH_MAX - 1)] = -1 }; + +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; +}; + +/* bit definitions for register read */ +#define AZTECH_BIT_NOT_TUNED (1 << 0) +#define AZTECH_BIT_MONO (1 << 1) +/* bit definitions for register write */ +#define AZTECH_BIT_TUN_CE (1 << 1) +#define AZTECH_BIT_TUN_CLK (1 << 6) +#define AZTECH_BIT_TUN_DATA (1 << 7) +/* bits 0 and 2 are volume control, bits 3..5 are not connected */ + +static void aztech_set_pins(void *handle, u8 pins) +{ + struct radio_isa_card *isa = handle; + struct aztech *az = container_of(isa, struct aztech, isa); + u8 bits = az->curvol; + + if (pins & LM7000_DATA) + bits |= AZTECH_BIT_TUN_DATA; + if (pins & LM7000_CLK) + bits |= AZTECH_BIT_TUN_CLK; + if (pins & LM7000_CE) + bits |= AZTECH_BIT_TUN_CE; + + outb_p(bits, 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) +{ + lm7000_set_freq(freq, isa, aztech_set_pins); + + return 0; +} + +static u32 aztech_g_rxsubchans(struct radio_isa_card *isa) +{ + if (inb(isa->io) & AZTECH_BIT_MONO) + return V4L2_TUNER_SUB_MONO; + return V4L2_TUNER_SUB_STEREO; +} + +static u32 aztech_g_signal(struct radio_isa_card *isa) +{ + return (inb(isa->io) & AZTECH_BIT_NOT_TUNED) ? 0 : 0xffff; +} + +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, + .g_rxsubchans = aztech_g_rxsubchans, + .g_signal = aztech_g_signal, +}; + +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 = 8, + .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); |