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-rw-r--r--drivers/media/radio/radio-terratec.c171
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diff --git a/drivers/media/radio/radio-terratec.c b/drivers/media/radio/radio-terratec.c
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+// SPDX-License-Identifier: GPL-2.0-only
+/* Terratec ActiveRadio ISA Standalone card driver for Linux radio support
+ * (c) 1999 R. Offermanns (rolf@offermanns.de)
+ * based on the aimslab radio driver from M. Kirkwood
+ * many thanks to Michael Becker and Friedhelm Birth (from TerraTec)
+ *
+ *
+ * History:
+ * 1999-05-21 First preview release
+ *
+ * Notes on the hardware:
+ * There are two "main" chips on the card:
+ * - Philips OM5610 (http://www-us.semiconductors.philips.com/acrobat/datasheets/OM5610_2.pdf)
+ * - Philips SAA6588 (http://www-us.semiconductors.philips.com/acrobat/datasheets/SAA6588_1.pdf)
+ * (you can get the datasheet at the above links)
+ *
+ * Frequency control is done digitally -- ie out(port,encodefreq(95.8));
+ * Volume Control is done digitally
+ *
+ * Converted to the radio-isa framework by Hans Verkuil <hans.verkuil@cisco.com>
+ * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@kernel.org>
+ */
+
+#include <linux/module.h> /* Modules */
+#include <linux/init.h> /* Initdata */
+#include <linux/ioport.h> /* request_region */
+#include <linux/videodev2.h> /* kernel radio structs */
+#include <linux/mutex.h>
+#include <linux/io.h> /* outb, outb_p */
+#include <linux/slab.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-ioctl.h>
+#include "radio-isa.h"
+
+MODULE_AUTHOR("R. Offermans & others");
+MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card.");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("0.1.99");
+
+/* Note: there seems to be only one possible port (0x590), but without
+ hardware this is hard to verify. For now, this is the only one we will
+ support. */
+static int io = 0x590;
+static int radio_nr = -1;
+
+module_param(radio_nr, int, 0444);
+MODULE_PARM_DESC(radio_nr, "Radio device number");
+
+#define WRT_DIS 0x00
+#define CLK_OFF 0x00
+#define IIC_DATA 0x01
+#define IIC_CLK 0x02
+#define DATA 0x04
+#define CLK_ON 0x08
+#define WRT_EN 0x10
+
+static struct radio_isa_card *terratec_alloc(void)
+{
+ return kzalloc(sizeof(struct radio_isa_card), GFP_KERNEL);
+}
+
+static int terratec_s_mute_volume(struct radio_isa_card *isa, bool mute, int vol)
+{
+ int i;
+
+ if (mute)
+ vol = 0;
+ vol = vol + (vol * 32); /* change both channels */
+ for (i = 0; i < 8; i++) {
+ if (vol & (0x80 >> i))
+ outb(0x80, isa->io + 1);
+ else
+ outb(0x00, isa->io + 1);
+ }
+ return 0;
+}
+
+
+/* this is the worst part in this driver */
+/* many more or less strange things are going on here, but hey, it works :) */
+
+static int terratec_s_frequency(struct radio_isa_card *isa, u32 freq)
+{
+ int i;
+ int p;
+ int temp;
+ long rest;
+ unsigned char buffer[25]; /* we have to bit shift 25 registers */
+
+ freq = freq / 160; /* convert the freq. to a nice to handle value */
+ memset(buffer, 0, sizeof(buffer));
+
+ rest = freq * 10 + 10700; /* I once had understood what is going on here */
+ /* maybe some wise guy (friedhelm?) can comment this stuff */
+ i = 13;
+ p = 10;
+ temp = 102400;
+ while (rest != 0) {
+ if (rest % temp == rest)
+ buffer[i] = 0;
+ else {
+ buffer[i] = 1;
+ rest = rest - temp;
+ }
+ i--;
+ p--;
+ temp = temp / 2;
+ }
+
+ for (i = 24; i > -1; i--) { /* bit shift the values to the radiocard */
+ if (buffer[i] == 1) {
+ outb(WRT_EN | DATA, isa->io);
+ outb(WRT_EN | DATA | CLK_ON, isa->io);
+ outb(WRT_EN | DATA, isa->io);
+ } else {
+ outb(WRT_EN | 0x00, isa->io);
+ outb(WRT_EN | 0x00 | CLK_ON, isa->io);
+ }
+ }
+ outb(0x00, isa->io);
+ return 0;
+}
+
+static u32 terratec_g_signal(struct radio_isa_card *isa)
+{
+ /* bit set = no signal present */
+ return (inb(isa->io) & 2) ? 0 : 0xffff;
+}
+
+static const struct radio_isa_ops terratec_ops = {
+ .alloc = terratec_alloc,
+ .s_mute_volume = terratec_s_mute_volume,
+ .s_frequency = terratec_s_frequency,
+ .g_signal = terratec_g_signal,
+};
+
+static const int terratec_ioports[] = { 0x590 };
+
+static struct radio_isa_driver terratec_driver = {
+ .driver = {
+ .match = radio_isa_match,
+ .probe = radio_isa_probe,
+ .remove = radio_isa_remove,
+ .driver = {
+ .name = "radio-terratec",
+ },
+ },
+ .io_params = &io,
+ .radio_nr_params = &radio_nr,
+ .io_ports = terratec_ioports,
+ .num_of_io_ports = ARRAY_SIZE(terratec_ioports),
+ .region_size = 2,
+ .card = "TerraTec ActiveRadio",
+ .ops = &terratec_ops,
+ .has_stereo = true,
+ .max_volume = 10,
+};
+
+static int __init terratec_init(void)
+{
+ return isa_register_driver(&terratec_driver.driver, 1);
+}
+
+static void __exit terratec_exit(void)
+{
+ isa_unregister_driver(&terratec_driver.driver);
+}
+
+module_init(terratec_init);
+module_exit(terratec_exit);
+