1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * radio-aztech.c - Aztech radio card driver 4 * 5 * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@xs4all.nl> 6 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@kernel.org> 7 * Adapted to support the Video for Linux API by 8 * Russell Kroll <rkroll@exploits.org>. Based on original tuner code by: 9 * 10 * Quay Ly 11 * Donald Song 12 * Jason Lewis (jlewis@twilight.vtc.vsc.edu) 13 * Scott McGrath (smcgrath@twilight.vtc.vsc.edu) 14 * William McGrath (wmcgrath@twilight.vtc.vsc.edu) 15 * 16 * Fully tested with the Keene USB FM Transmitter and the v4l2-compliance tool. 17 */ 18 19 #include <linux/module.h> /* Modules */ 20 #include <linux/init.h> /* Initdata */ 21 #include <linux/ioport.h> /* request_region */ 22 #include <linux/delay.h> /* udelay */ 23 #include <linux/videodev2.h> /* kernel radio structs */ 24 #include <linux/io.h> /* outb, outb_p */ 25 #include <linux/slab.h> 26 #include <media/v4l2-device.h> 27 #include <media/v4l2-ioctl.h> 28 #include <media/v4l2-ctrls.h> 29 #include "radio-isa.h" 30 #include "lm7000.h" 31 32 MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath"); 33 MODULE_DESCRIPTION("A driver for the Aztech radio card."); 34 MODULE_LICENSE("GPL"); 35 MODULE_VERSION("1.0.0"); 36 37 /* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */ 38 #ifndef CONFIG_RADIO_AZTECH_PORT 39 #define CONFIG_RADIO_AZTECH_PORT -1 40 #endif 41 42 #define AZTECH_MAX 2 43 44 static int io[AZTECH_MAX] = { [0] = CONFIG_RADIO_AZTECH_PORT, 45 [1 ... (AZTECH_MAX - 1)] = -1 }; 46 static int radio_nr[AZTECH_MAX] = { [0 ... (AZTECH_MAX - 1)] = -1 }; 47 48 module_param_array(io, int, NULL, 0444); 49 MODULE_PARM_DESC(io, "I/O addresses of the Aztech card (0x350 or 0x358)"); 50 module_param_array(radio_nr, int, NULL, 0444); 51 MODULE_PARM_DESC(radio_nr, "Radio device numbers"); 52 53 struct aztech { 54 struct radio_isa_card isa; 55 int curvol; 56 }; 57 58 /* bit definitions for register read */ 59 #define AZTECH_BIT_NOT_TUNED (1 << 0) 60 #define AZTECH_BIT_MONO (1 << 1) 61 /* bit definitions for register write */ 62 #define AZTECH_BIT_TUN_CE (1 << 1) 63 #define AZTECH_BIT_TUN_CLK (1 << 6) 64 #define AZTECH_BIT_TUN_DATA (1 << 7) 65 /* bits 0 and 2 are volume control, bits 3..5 are not connected */ 66 67 static void aztech_set_pins(void *handle, u8 pins) 68 { 69 struct radio_isa_card *isa = handle; 70 struct aztech *az = container_of(isa, struct aztech, isa); 71 u8 bits = az->curvol; 72 73 if (pins & LM7000_DATA) 74 bits |= AZTECH_BIT_TUN_DATA; 75 if (pins & LM7000_CLK) 76 bits |= AZTECH_BIT_TUN_CLK; 77 if (pins & LM7000_CE) 78 bits |= AZTECH_BIT_TUN_CE; 79 80 outb_p(bits, az->isa.io); 81 } 82 83 static struct radio_isa_card *aztech_alloc(void) 84 { 85 struct aztech *az = kzalloc(sizeof(*az), GFP_KERNEL); 86 87 return az ? &az->isa : NULL; 88 } 89 90 static int aztech_s_frequency(struct radio_isa_card *isa, u32 freq) 91 { 92 lm7000_set_freq(freq, isa, aztech_set_pins); 93 94 return 0; 95 } 96 97 static u32 aztech_g_rxsubchans(struct radio_isa_card *isa) 98 { 99 if (inb(isa->io) & AZTECH_BIT_MONO) 100 return V4L2_TUNER_SUB_MONO; 101 return V4L2_TUNER_SUB_STEREO; 102 } 103 104 static u32 aztech_g_signal(struct radio_isa_card *isa) 105 { 106 return (inb(isa->io) & AZTECH_BIT_NOT_TUNED) ? 0 : 0xffff; 107 } 108 109 static int aztech_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol) 110 { 111 struct aztech *az = container_of(isa, struct aztech, isa); 112 113 if (mute) 114 vol = 0; 115 az->curvol = (vol & 1) + ((vol & 2) << 1); 116 outb(az->curvol, isa->io); 117 return 0; 118 } 119 120 static const struct radio_isa_ops aztech_ops = { 121 .alloc = aztech_alloc, 122 .s_mute_volume = aztech_s_mute_volume, 123 .s_frequency = aztech_s_frequency, 124 .g_rxsubchans = aztech_g_rxsubchans, 125 .g_signal = aztech_g_signal, 126 }; 127 128 static const int aztech_ioports[] = { 0x350, 0x358 }; 129 130 static struct radio_isa_driver aztech_driver = { 131 .driver = { 132 .match = radio_isa_match, 133 .probe = radio_isa_probe, 134 .remove = radio_isa_remove, 135 .driver = { 136 .name = "radio-aztech", 137 }, 138 }, 139 .io_params = io, 140 .radio_nr_params = radio_nr, 141 .io_ports = aztech_ioports, 142 .num_of_io_ports = ARRAY_SIZE(aztech_ioports), 143 .region_size = 8, 144 .card = "Aztech Radio", 145 .ops = &aztech_ops, 146 .has_stereo = true, 147 .max_volume = 3, 148 }; 149 150 static int __init aztech_init(void) 151 { 152 return isa_register_driver(&aztech_driver.driver, AZTECH_MAX); 153 } 154 155 static void __exit aztech_exit(void) 156 { 157 isa_unregister_driver(&aztech_driver.driver); 158 } 159 160 module_init(aztech_init); 161 module_exit(aztech_exit); 162