drivers/media/radio/radio-sf16fmr2.c

   1 /* SF16-FMR2 radio driver for Linux
   2  * Copyright (c) 2011 Ondrej Zary
   3  *
   4  * Original driver was (c) 2000-2002 Ziglio Frediano, freddy77@angelfire.com
   5  * but almost nothing remained here after conversion to generic TEA575x
   6  * implementation
   7  */
   8
   9 #include <linux/delay.h>
  10 #include <linux/module.h>       /* Modules                      */
  11 #include <linux/init.h>         /* Initdata                     */
  12 #include <linux/ioport.h>       /* request_region               */
  13 #include <linux/io.h>           /* outb, outb_p                 */
  14 #include <sound/tea575x-tuner.h>
  15
  16 MODULE_AUTHOR("Ondrej Zary");
  17 MODULE_DESCRIPTION("MediaForte SF16-FMR2 FM radio card driver");
  18 MODULE_LICENSE("GPL");
  19
  20 struct fmr2 {
  21         int io;
  22         struct snd_tea575x tea;
  23         struct v4l2_ctrl *volume;
  24         struct v4l2_ctrl *balance;
  25 };
  26
  27 /* the port is hardwired so no need to support multiple cards */
  28 #define FMR2_PORT       0x384
  29 static struct fmr2 fmr2_card;
  30
  31 /* TEA575x tuner pins */
  32 #define STR_DATA        (1 << 0)
  33 #define STR_CLK         (1 << 1)
  34 #define STR_WREN        (1 << 2)
  35 #define STR_MOST        (1 << 3)
  36 /* PT2254A/TC9154A volume control pins */
  37 #define PT_ST           (1 << 4)
  38 #define PT_CK           (1 << 5)
  39 #define PT_DATA         (1 << 6)
  40 /* volume control presence pin */
  41 #define FMR2_HASVOL     (1 << 7)
  42
  43 static void fmr2_tea575x_set_pins(struct snd_tea575x *tea, u8 pins)
  44 {
  45         struct fmr2 *fmr2 = tea->private_data;
  46         u8 bits = 0;
  47
  48         bits |= (pins & TEA575X_DATA) ? STR_DATA : 0;
  49         bits |= (pins & TEA575X_CLK)  ? STR_CLK  : 0;
  50         /* WRITE_ENABLE is inverted, DATA must be high during read */
  51         bits |= (pins & TEA575X_WREN) ? 0 : STR_WREN | STR_DATA;
  52
  53         outb(bits, fmr2->io);
  54 }
  55
  56 static u8 fmr2_tea575x_get_pins(struct snd_tea575x *tea)
  57 {
  58         struct fmr2 *fmr2 = tea->private_data;
  59         u8 bits = inb(fmr2->io);
  60
  61         return  (bits & STR_DATA) ? TEA575X_DATA : 0 |
  62                 (bits & STR_MOST) ? TEA575X_MOST : 0;
  63 }
  64
  65 static void fmr2_tea575x_set_direction(struct snd_tea575x *tea, bool output)
  66 {
  67 }
  68
  69 static struct snd_tea575x_ops fmr2_tea_ops = {
  70         .set_pins = fmr2_tea575x_set_pins,
  71         .get_pins = fmr2_tea575x_get_pins,
  72         .set_direction = fmr2_tea575x_set_direction,
  73 };
  74
  75 /* TC9154A/PT2254A volume control */
  76
  77 /* 18-bit shift register bit definitions */
  78 #define TC9154A_ATT_MAJ_0DB     (1 << 0)
  79 #define TC9154A_ATT_MAJ_10DB    (1 << 1)
  80 #define TC9154A_ATT_MAJ_20DB    (1 << 2)
  81 #define TC9154A_ATT_MAJ_30DB    (1 << 3)
  82 #define TC9154A_ATT_MAJ_40DB    (1 << 4)
  83 #define TC9154A_ATT_MAJ_50DB    (1 << 5)
  84 #define TC9154A_ATT_MAJ_60DB    (1 << 6)
  85
  86 #define TC9154A_ATT_MIN_0DB     (1 << 7)
  87 #define TC9154A_ATT_MIN_2DB     (1 << 8)
  88 #define TC9154A_ATT_MIN_4DB     (1 << 9)
  89 #define TC9154A_ATT_MIN_6DB     (1 << 10)
  90 #define TC9154A_ATT_MIN_8DB     (1 << 11)
  91 /* bit 12 is ignored */
  92 #define TC9154A_CHANNEL_LEFT    (1 << 13)
  93 #define TC9154A_CHANNEL_RIGHT   (1 << 14)
  94 /* bits 15, 16, 17 must be 0 */
  95
  96 #define TC9154A_ATT_MAJ(x)      (1 << x)
  97 #define TC9154A_ATT_MIN(x)      (1 << (7 + x))
  98
  99 static void tc9154a_set_pins(struct fmr2 *fmr2, u8 pins)
 100 {
 101         if (!fmr2->tea.mute)
 102                 pins |= STR_WREN;
 103
 104         outb(pins, fmr2->io);
 105 }
 106
 107 static void tc9154a_set_attenuation(struct fmr2 *fmr2, int att, u32 channel)
 108 {
 109         int i;
 110         u32 reg;
 111         u8 bit;
 112
 113         reg = TC9154A_ATT_MAJ(att / 10) | TC9154A_ATT_MIN((att % 10) / 2);
 114         reg |= channel;
 115         /* write 18-bit shift register, LSB first */
 116         for (i = 0; i < 18; i++) {
 117                 bit = reg & (1 << i) ? PT_DATA : 0;
 118                 tc9154a_set_pins(fmr2, bit);
 119                 udelay(5);
 120                 tc9154a_set_pins(fmr2, bit | PT_CK);
 121                 udelay(5);
 122                 tc9154a_set_pins(fmr2, bit);
 123         }
 124
 125         /* latch register data */
 126         udelay(5);
 127         tc9154a_set_pins(fmr2, PT_ST);
 128         udelay(5);
 129         tc9154a_set_pins(fmr2, 0);
 130 }
 131
 132 static int fmr2_s_ctrl(struct v4l2_ctrl *ctrl)
 133 {
 134         struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler);
 135         struct fmr2 *fmr2 = tea->private_data;
 136         int volume, balance, left, right;
 137
 138         switch (ctrl->id) {
 139         case V4L2_CID_AUDIO_VOLUME:
 140                 volume = ctrl->val;
 141                 balance = fmr2->balance->cur.val;
 142                 break;
 143         case V4L2_CID_AUDIO_BALANCE:
 144                 balance = ctrl->val;
 145                 volume = fmr2->volume->cur.val;
 146                 break;
 147         default:
 148                 return -EINVAL;
 149         }
 150
 151         left = right = volume;
 152         if (balance < 0)
 153                 right = max(0, right + balance);
 154         if (balance > 0)
 155                 left = max(0, left - balance);
 156
 157         tc9154a_set_attenuation(fmr2, abs(left - 68), TC9154A_CHANNEL_LEFT);
 158         tc9154a_set_attenuation(fmr2, abs(right - 68), TC9154A_CHANNEL_RIGHT);
 159
 160         return 0;
 161 }
 162
 163 static const struct v4l2_ctrl_ops fmr2_ctrl_ops = {
 164         .s_ctrl = fmr2_s_ctrl,
 165 };
 166
 167 static int fmr2_tea_ext_init(struct snd_tea575x *tea)
 168 {
 169         struct fmr2 *fmr2 = tea->private_data;
 170
 171         if (inb(fmr2->io) & FMR2_HASVOL) {
 172                 fmr2->volume = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_VOLUME, 0, 68, 2, 56);
 173                 fmr2->balance = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_BALANCE, -68, 68, 2, 0);
 174                 if (tea->ctrl_handler.error) {
 175                         printk(KERN_ERR "radio-sf16fmr2: can't initialize contrls\n");
 176                         return tea->ctrl_handler.error;
 177                 }
 178         }
 179
 180         return 0;
 181 }
 182
 183 static int __init fmr2_init(void)
 184 {
 185         struct fmr2 *fmr2 = &fmr2_card;
 186
 187         fmr2->io = FMR2_PORT;
 188
 189         if (!request_region(fmr2->io, 2, "SF16-FMR2")) {
 190                 printk(KERN_ERR "radio-sf16fmr2: I/O port 0x%x already in use\n", fmr2->io);
 191                 return -EBUSY;
 192         }
 193
 194         fmr2->tea.private_data = fmr2;
 195         fmr2->tea.ops = &fmr2_tea_ops;
 196         fmr2->tea.ext_init = fmr2_tea_ext_init;
 197         strlcpy(fmr2->tea.card, "SF16-FMR2", sizeof(fmr2->tea.card));
 198         strcpy(fmr2->tea.bus_info, "ISA");
 199
 200         if (snd_tea575x_init(&fmr2->tea)) {
 201                 printk(KERN_ERR "radio-sf16fmr2: Unable to detect TEA575x tuner\n");
 202                 release_region(fmr2->io, 2);
 203                 return -ENODEV;
 204         }
 205
 206         printk(KERN_INFO "radio-sf16fmr2: SF16-FMR2 radio card at 0x%x.\n", fmr2->io);
 207         return 0;
 208 }
 209
 210 static void __exit fmr2_exit(void)
 211 {
 212         struct fmr2 *fmr2 = &fmr2_card;
 213
 214         snd_tea575x_exit(&fmr2->tea);
 215         release_region(fmr2->io, 2);
 216 }
 217
 218 module_init(fmr2_init);
 219 module_exit(fmr2_exit);