diff options
Diffstat (limited to 'drivers/media/radio/radio-sf16fmr2.c')
| -rw-r--r-- | drivers/media/radio/radio-sf16fmr2.c | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-sf16fmr2.c b/drivers/media/radio/radio-sf16fmr2.c new file mode 100644 index 00000000..7c692143 --- /dev/null +++ b/drivers/media/radio/radio-sf16fmr2.c @@ -0,0 +1,266 @@ +/* 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/slab.h> +#include <linux/ioport.h> /* request_region */ +#include <linux/io.h> /* outb, outb_p */ +#include <linux/isa.h> +#include <sound/tea575x-tuner.h> + +MODULE_AUTHOR("Ondrej Zary"); +MODULE_DESCRIPTION("MediaForte SF16-FMR2 FM radio card driver"); +MODULE_LICENSE("GPL"); + +static int radio_nr = -1; +module_param(radio_nr, int, 0444); +MODULE_PARM_DESC(radio_nr, "Radio device number"); + +struct fmr2 { + int io; + struct v4l2_device v4l2_dev; + 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 + +/* 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 controls\n"); + return tea->ctrl_handler.error; + } + } + + return 0; +} + +static int __devinit fmr2_probe(struct device *pdev, unsigned int dev) +{ + struct fmr2 *fmr2; + int err; + + fmr2 = kzalloc(sizeof(*fmr2), GFP_KERNEL); + if (fmr2 == NULL) + return -ENOMEM; + + strlcpy(fmr2->v4l2_dev.name, dev_name(pdev), + sizeof(fmr2->v4l2_dev.name)); + fmr2->io = FMR2_PORT; + + if (!request_region(fmr2->io, 2, fmr2->v4l2_dev.name)) { + printk(KERN_ERR "radio-sf16fmr2: I/O port 0x%x already in use\n", fmr2->io); + kfree(fmr2); + return -EBUSY; + } + + dev_set_drvdata(pdev, fmr2); + err = v4l2_device_register(pdev, &fmr2->v4l2_dev); + if (err < 0) { + v4l2_err(&fmr2->v4l2_dev, "Could not register v4l2_device\n"); + release_region(fmr2->io, 2); + kfree(fmr2); + return err; + } + fmr2->tea.v4l2_dev = &fmr2->v4l2_dev; + fmr2->tea.private_data = fmr2; + fmr2->tea.radio_nr = radio_nr; + fmr2->tea.ops = &fmr2_tea_ops; + fmr2->tea.ext_init = fmr2_tea_ext_init; + strlcpy(fmr2->tea.card, "SF16-FMR2", sizeof(fmr2->tea.card)); + snprintf(fmr2->tea.bus_info, sizeof(fmr2->tea.bus_info), "ISA:%s", + fmr2->v4l2_dev.name); + + if (snd_tea575x_init(&fmr2->tea)) { + printk(KERN_ERR "radio-sf16fmr2: Unable to detect TEA575x tuner\n"); + release_region(fmr2->io, 2); + kfree(fmr2); + return -ENODEV; + } + + printk(KERN_INFO "radio-sf16fmr2: SF16-FMR2 radio card at 0x%x.\n", fmr2->io); + return 0; +} + +static int __exit fmr2_remove(struct device *pdev, unsigned int dev) +{ + struct fmr2 *fmr2 = dev_get_drvdata(pdev); + + snd_tea575x_exit(&fmr2->tea); + release_region(fmr2->io, 2); + v4l2_device_unregister(&fmr2->v4l2_dev); + kfree(fmr2); + return 0; +} + +struct isa_driver fmr2_driver = { + .probe = fmr2_probe, + .remove = fmr2_remove, + .driver = { + .name = "radio-sf16fmr2", + }, +}; + +static int __init fmr2_init(void) +{ + return isa_register_driver(&fmr2_driver, 1); +} + +static void __exit fmr2_exit(void) +{ + isa_unregister_driver(&fmr2_driver); +} + +module_init(fmr2_init); +module_exit(fmr2_exit); |