267 lines
6.6 KiB
C
267 lines
6.6 KiB
C
/* SF16-FMR2 radio driver for Linux
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* Copyright (c) 2011 Ondrej Zary
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*
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* Original driver was (c) 2000-2002 Ziglio Frediano, freddy77@angelfire.com
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* but almost nothing remained here after conversion to generic TEA575x
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* implementation
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*/
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#include <linux/delay.h>
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#include <linux/module.h> /* Modules */
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#include <linux/init.h> /* Initdata */
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#include <linux/slab.h>
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#include <linux/ioport.h> /* request_region */
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#include <linux/io.h> /* outb, outb_p */
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#include <linux/isa.h>
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#include <sound/tea575x-tuner.h>
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MODULE_AUTHOR("Ondrej Zary");
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MODULE_DESCRIPTION("MediaForte SF16-FMR2 FM radio card driver");
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MODULE_LICENSE("GPL");
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static int radio_nr = -1;
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module_param(radio_nr, int, 0444);
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MODULE_PARM_DESC(radio_nr, "Radio device number");
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struct fmr2 {
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int io;
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struct v4l2_device v4l2_dev;
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struct snd_tea575x tea;
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struct v4l2_ctrl *volume;
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struct v4l2_ctrl *balance;
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};
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/* the port is hardwired so no need to support multiple cards */
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#define FMR2_PORT 0x384
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/* TEA575x tuner pins */
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#define STR_DATA (1 << 0)
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#define STR_CLK (1 << 1)
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#define STR_WREN (1 << 2)
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#define STR_MOST (1 << 3)
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/* PT2254A/TC9154A volume control pins */
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#define PT_ST (1 << 4)
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#define PT_CK (1 << 5)
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#define PT_DATA (1 << 6)
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/* volume control presence pin */
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#define FMR2_HASVOL (1 << 7)
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static void fmr2_tea575x_set_pins(struct snd_tea575x *tea, u8 pins)
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{
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struct fmr2 *fmr2 = tea->private_data;
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u8 bits = 0;
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bits |= (pins & TEA575X_DATA) ? STR_DATA : 0;
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bits |= (pins & TEA575X_CLK) ? STR_CLK : 0;
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/* WRITE_ENABLE is inverted, DATA must be high during read */
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bits |= (pins & TEA575X_WREN) ? 0 : STR_WREN | STR_DATA;
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outb(bits, fmr2->io);
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}
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static u8 fmr2_tea575x_get_pins(struct snd_tea575x *tea)
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{
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struct fmr2 *fmr2 = tea->private_data;
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u8 bits = inb(fmr2->io);
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return (bits & STR_DATA) ? TEA575X_DATA : 0 |
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(bits & STR_MOST) ? TEA575X_MOST : 0;
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}
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static void fmr2_tea575x_set_direction(struct snd_tea575x *tea, bool output)
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{
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}
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static struct snd_tea575x_ops fmr2_tea_ops = {
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.set_pins = fmr2_tea575x_set_pins,
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.get_pins = fmr2_tea575x_get_pins,
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.set_direction = fmr2_tea575x_set_direction,
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};
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/* TC9154A/PT2254A volume control */
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/* 18-bit shift register bit definitions */
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#define TC9154A_ATT_MAJ_0DB (1 << 0)
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#define TC9154A_ATT_MAJ_10DB (1 << 1)
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#define TC9154A_ATT_MAJ_20DB (1 << 2)
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#define TC9154A_ATT_MAJ_30DB (1 << 3)
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#define TC9154A_ATT_MAJ_40DB (1 << 4)
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#define TC9154A_ATT_MAJ_50DB (1 << 5)
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#define TC9154A_ATT_MAJ_60DB (1 << 6)
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#define TC9154A_ATT_MIN_0DB (1 << 7)
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#define TC9154A_ATT_MIN_2DB (1 << 8)
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#define TC9154A_ATT_MIN_4DB (1 << 9)
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#define TC9154A_ATT_MIN_6DB (1 << 10)
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#define TC9154A_ATT_MIN_8DB (1 << 11)
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/* bit 12 is ignored */
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#define TC9154A_CHANNEL_LEFT (1 << 13)
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#define TC9154A_CHANNEL_RIGHT (1 << 14)
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/* bits 15, 16, 17 must be 0 */
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#define TC9154A_ATT_MAJ(x) (1 << x)
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#define TC9154A_ATT_MIN(x) (1 << (7 + x))
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static void tc9154a_set_pins(struct fmr2 *fmr2, u8 pins)
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{
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if (!fmr2->tea.mute)
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pins |= STR_WREN;
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outb(pins, fmr2->io);
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}
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static void tc9154a_set_attenuation(struct fmr2 *fmr2, int att, u32 channel)
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{
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int i;
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u32 reg;
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u8 bit;
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reg = TC9154A_ATT_MAJ(att / 10) | TC9154A_ATT_MIN((att % 10) / 2);
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reg |= channel;
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/* write 18-bit shift register, LSB first */
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for (i = 0; i < 18; i++) {
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bit = reg & (1 << i) ? PT_DATA : 0;
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tc9154a_set_pins(fmr2, bit);
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udelay(5);
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tc9154a_set_pins(fmr2, bit | PT_CK);
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udelay(5);
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tc9154a_set_pins(fmr2, bit);
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}
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/* latch register data */
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udelay(5);
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tc9154a_set_pins(fmr2, PT_ST);
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udelay(5);
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tc9154a_set_pins(fmr2, 0);
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}
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static int fmr2_s_ctrl(struct v4l2_ctrl *ctrl)
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{
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struct snd_tea575x *tea = container_of(ctrl->handler, struct snd_tea575x, ctrl_handler);
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struct fmr2 *fmr2 = tea->private_data;
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int volume, balance, left, right;
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switch (ctrl->id) {
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case V4L2_CID_AUDIO_VOLUME:
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volume = ctrl->val;
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balance = fmr2->balance->cur.val;
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break;
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case V4L2_CID_AUDIO_BALANCE:
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balance = ctrl->val;
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volume = fmr2->volume->cur.val;
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break;
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default:
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return -EINVAL;
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}
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left = right = volume;
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if (balance < 0)
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right = max(0, right + balance);
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if (balance > 0)
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left = max(0, left - balance);
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tc9154a_set_attenuation(fmr2, abs(left - 68), TC9154A_CHANNEL_LEFT);
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tc9154a_set_attenuation(fmr2, abs(right - 68), TC9154A_CHANNEL_RIGHT);
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return 0;
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}
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static const struct v4l2_ctrl_ops fmr2_ctrl_ops = {
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.s_ctrl = fmr2_s_ctrl,
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};
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static int fmr2_tea_ext_init(struct snd_tea575x *tea)
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{
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struct fmr2 *fmr2 = tea->private_data;
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if (inb(fmr2->io) & FMR2_HASVOL) {
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fmr2->volume = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_VOLUME, 0, 68, 2, 56);
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fmr2->balance = v4l2_ctrl_new_std(&tea->ctrl_handler, &fmr2_ctrl_ops, V4L2_CID_AUDIO_BALANCE, -68, 68, 2, 0);
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if (tea->ctrl_handler.error) {
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printk(KERN_ERR "radio-sf16fmr2: can't initialize controls\n");
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return tea->ctrl_handler.error;
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}
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}
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return 0;
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}
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static int __devinit fmr2_probe(struct device *pdev, unsigned int dev)
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{
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struct fmr2 *fmr2;
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int err;
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fmr2 = kzalloc(sizeof(*fmr2), GFP_KERNEL);
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if (fmr2 == NULL)
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return -ENOMEM;
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strlcpy(fmr2->v4l2_dev.name, dev_name(pdev),
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sizeof(fmr2->v4l2_dev.name));
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fmr2->io = FMR2_PORT;
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if (!request_region(fmr2->io, 2, fmr2->v4l2_dev.name)) {
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printk(KERN_ERR "radio-sf16fmr2: I/O port 0x%x already in use\n", fmr2->io);
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kfree(fmr2);
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return -EBUSY;
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}
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dev_set_drvdata(pdev, fmr2);
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err = v4l2_device_register(pdev, &fmr2->v4l2_dev);
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if (err < 0) {
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v4l2_err(&fmr2->v4l2_dev, "Could not register v4l2_device\n");
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release_region(fmr2->io, 2);
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kfree(fmr2);
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return err;
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}
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fmr2->tea.v4l2_dev = &fmr2->v4l2_dev;
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fmr2->tea.private_data = fmr2;
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fmr2->tea.radio_nr = radio_nr;
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fmr2->tea.ops = &fmr2_tea_ops;
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fmr2->tea.ext_init = fmr2_tea_ext_init;
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strlcpy(fmr2->tea.card, "SF16-FMR2", sizeof(fmr2->tea.card));
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snprintf(fmr2->tea.bus_info, sizeof(fmr2->tea.bus_info), "ISA:%s",
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fmr2->v4l2_dev.name);
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if (snd_tea575x_init(&fmr2->tea)) {
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printk(KERN_ERR "radio-sf16fmr2: Unable to detect TEA575x tuner\n");
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release_region(fmr2->io, 2);
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kfree(fmr2);
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return -ENODEV;
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}
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printk(KERN_INFO "radio-sf16fmr2: SF16-FMR2 radio card at 0x%x.\n", fmr2->io);
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return 0;
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}
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static int __exit fmr2_remove(struct device *pdev, unsigned int dev)
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{
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struct fmr2 *fmr2 = dev_get_drvdata(pdev);
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snd_tea575x_exit(&fmr2->tea);
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release_region(fmr2->io, 2);
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v4l2_device_unregister(&fmr2->v4l2_dev);
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kfree(fmr2);
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return 0;
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}
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struct isa_driver fmr2_driver = {
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.probe = fmr2_probe,
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.remove = fmr2_remove,
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.driver = {
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.name = "radio-sf16fmr2",
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},
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};
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static int __init fmr2_init(void)
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{
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return isa_register_driver(&fmr2_driver, 1);
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}
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static void __exit fmr2_exit(void)
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{
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isa_unregister_driver(&fmr2_driver);
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}
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module_init(fmr2_init);
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module_exit(fmr2_exit);
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