/* SF16-FMR2 radio driver for Linux * Copyright (c) 2011 Ondrej Zary * * Original driver was (c) 2000-2002 Ziglio Frediano, freddy77@angelfire.com * but almost nothing remained here after conversion to generic TEA575x * implementation */ #include <linux/delay.h> #include <linux/module.h> /* Modules */ #include <linux/init.h> /* Initdata */ #include <linux/ioport.h> /* request_region */ #include <linux/io.h> /* outb, outb_p */ #include <sound/tea575x-tuner.h> MODULE_AUTHOR("Ondrej Zary"); MODULE_DESCRIPTION("MediaForte SF16-FMR2 FM radio card driver"); MODULE_LICENSE("GPL"); struct fmr2 { int io; struct snd_tea575x tea; struct v4l2_ctrl *volume; struct v4l2_ctrl *balance; }; /* the port is hardwired so no need to support multiple cards */ #define FMR2_PORT 0x384 static struct fmr2 fmr2_card; /* TEA575x tuner pins */ #define STR_DATA (1 << 0) #define STR_CLK (1 << 1) #define STR_WREN (1 << 2) #define STR_MOST (1 << 3) /* PT2254A/TC9154A volume control pins */ #define PT_ST (1 << 4) #define PT_CK (1 << 5) #define PT_DATA (1 << 6) /* volume control presence pin */ #define FMR2_HASVOL (1 << 7) static void fmr2_tea575x_set_pins(struct snd_tea575x *tea, u8 pins) { struct fmr2 *fmr2 = tea->private_data; u8 bits = 0; bits |= (pins & TEA575X_DATA) ? STR_DATA : 0; bits |= (pins & TEA575X_CLK) ? STR_CLK : 0; /* WRITE_ENABLE is inverted, DATA must be high during read */ bits |= (pins & TEA575X_WREN) ? 0 : STR_WREN | STR_DATA; outb(bits, fmr2->io); } static u8 fmr2_tea575x_get_pins(struct snd_tea575x *tea) { struct fmr2 *fmr2 = tea->private_data; u8 bits = inb(fmr2->io); return (bits & STR_DATA) ? TEA575X_DATA : 0 | (bits & STR_MOST) ? TEA575X_MOST : 0; } static void fmr2_tea575x_set_direction(struct snd_tea575x *tea, bool output) { } static struct snd_tea575x_ops fmr2_tea_ops = { .set_pins = fmr2_tea575x_set_pins, .get_pins = fmr2_tea575x_get_pins, .set_direction = fmr2_tea575x_set_direction, }; /* TC9154A/PT2254A volume control */ /* 18-bit shift register bit definitions */ #define TC9154A_ATT_MAJ_0DB (1 << 0) #define TC9154A_ATT_MAJ_10DB (1 << 1) #define TC9154A_ATT_MAJ_20DB (1 << 2) #define TC9154A_ATT_MAJ_30DB (1 << 3) #define TC9154A_ATT_MAJ_40DB (1 << 4) #define TC9154A_ATT_MAJ_50DB (1 << 5) #define TC9154A_ATT_MAJ_60DB (1 << 6) #define TC9154A_ATT_MIN_0DB (1 << 7) #define TC9154A_ATT_MIN_2DB (1 << 8) #define TC9154A_ATT_MIN_4DB (1 << 9) #define TC9154A_ATT_MIN_6DB (1 << 10) #define TC9154A_ATT_MIN_8DB (1 << 11) /* bit 12 is ignored */ #define TC9154A_CHANNEL_LEFT (1 << 13) #define TC9154A_CHANNEL_RIGHT (1 << 14) /* bits 15, 16, 17 must be 0 */ #define TC9154A_ATT_MAJ(x) (1 << x) #define TC9154A_ATT_MIN(x) (1 << (7 + x)) static void tc9154a_set_pins(struct fmr2 *fmr2, u8 pins) { if (!fmr2->tea.mute) pins |= STR_WREN; outb(pins, fmr2->io); } static void tc9154a_set_attenuation(struct fmr2 *fmr2, int att, u32 channel) { int i; u32 reg; u8 bit; reg = TC9154A_ATT_MAJ(att / 10) | TC9154A_ATT_MIN((att % 10) / 2); reg |= channel; /* write 18-bit shift register, LSB first */ for (i = 0; i < 18; i++) { bit = reg & (1 << i) ? PT_DATA : 0; tc9154a_set_pins(fmr2, bit); udelay(5); tc9154a_set_pins(fmr2, bit | PT_CK); udelay(5); tc9154a_set_pins(fmr2, bit); } /* latch register data */ udelay(5); tc9154a_set_pins(fmr2, PT_ST); udelay(5); tc9154a_set_pins(fmr2, 0); } static int fmr2_s_ctrl(struct v4l2_ctrl *ctrl) { struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler); struct fmr2 *fmr2 = tea->private_data; int volume, balance, left, right; switch (ctrl->id) { case V4L2_CID_AUDIO_VOLUME: volume = ctrl->val; balance = fmr2->balance->cur.val; break; case V4L2_CID_AUDIO_BALANCE: balance = ctrl->val; volume = fmr2->volume->cur.val; break; default: return -EINVAL; } left = right = volume; if (balance < 0) right = max(0, right + balance); if (balance > 0) left = max(0, left - balance); tc9154a_set_attenuation(fmr2, abs(left - 68), TC9154A_CHANNEL_LEFT); tc9154a_set_attenuation(fmr2, abs(right - 68), TC9154A_CHANNEL_RIGHT); return 0; } static const struct v4l2_ctrl_ops fmr2_ctrl_ops = { .s_ctrl = fmr2_s_ctrl, }; static int fmr2_tea_ext_init(struct snd_tea575x *tea) { struct fmr2 *fmr2 = tea->private_data; if (inb(fmr2->io) & FMR2_HASVOL) { fmr2->volume = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_VOLUME, 0, 68, 2, 56); fmr2->balance = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_BALANCE, -68, 68, 2, 0); if (tea->ctrl_handler.error) { printk(KERN_ERR "radio-sf16fmr2: can't initialize contrls\n"); return tea->ctrl_handler.error; } } return 0; } static int __init fmr2_init(void) { struct fmr2 *fmr2 = &fmr2_card; fmr2->io = FMR2_PORT; if (!request_region(fmr2->io, 2, "SF16-FMR2")) { printk(KERN_ERR "radio-sf16fmr2: I/O port 0x%x already in use\n", fmr2->io); return -EBUSY; } fmr2->tea.private_data = fmr2; fmr2->tea.ops = &fmr2_tea_ops; fmr2->tea.ext_init = fmr2_tea_ext_init; strlcpy(fmr2->tea.card, "SF16-FMR2", sizeof(fmr2->tea.card)); strcpy(fmr2->tea.bus_info, "ISA"); if (snd_tea575x_init(&fmr2->tea)) { printk(KERN_ERR "radio-sf16fmr2: Unable to detect TEA575x tuner\n"); release_region(fmr2->io, 2); return -ENODEV; } printk(KERN_INFO "radio-sf16fmr2: SF16-FMR2 radio card at 0x%x.\n", fmr2->io); return 0; } static void __exit fmr2_exit(void) { struct fmr2 *fmr2 = &fmr2_card; snd_tea575x_exit(&fmr2->tea); release_region(fmr2->io, 2); } module_init(fmr2_init); module_exit(fmr2_exit);