ds2490.c

来自「linux 内核源代码」· C语言 代码 · 共 948 行 · 第 1/2 页

{
	int err;
	u8 del = 1 + (u8)(delay >> 4);
	struct ds_status st;

#if 0
	err = ds_stop_pulse(dev, 10);
	if (err)
		return err;

	err = ds_send_control_mode(dev, MOD_PULSE_EN, PULSE_SPUE);
	if (err)
		return err;
#endif
	err = ds_send_control(dev, COMM_SET_DURATION | COMM_IM, del);
	if (err)
		return err;

	err = ds_send_control(dev, COMM_PULSE | COMM_IM | COMM_F, 0);
	if (err)
		return err;

	mdelay(delay);

	ds_wait_status(dev, &st);

	return err;
}

static int ds_touch_bit(struct ds_device *dev, u8 bit, u8 *tbit)
{
	int err, count;
	struct ds_status st;
	u16 value = (COMM_BIT_IO | COMM_IM) | ((bit) ? COMM_D : 0);
	u16 cmd;

	err = ds_send_control(dev, value, 0);
	if (err)
		return err;

	count = 0;
	do {
		err = ds_wait_status(dev, &st);
		if (err)
			return err;

		cmd = st.command0 | (st.command1 << 8);
	} while (cmd != value && ++count < 10);

	if (err < 0 || count >= 10) {
		printk(KERN_ERR "Failed to obtain status.\n");
		return -EINVAL;
	}

	err = ds_recv_data(dev, tbit, sizeof(*tbit));
	if (err < 0)
		return err;

	return 0;
}

static int ds_write_bit(struct ds_device *dev, u8 bit)
{
	int err;
	struct ds_status st;

	err = ds_send_control(dev, COMM_BIT_IO | COMM_IM | (bit) ? COMM_D : 0, 0);
	if (err)
		return err;

	ds_wait_status(dev, &st);

	return 0;
}

static int ds_write_byte(struct ds_device *dev, u8 byte)
{
	int err;
	struct ds_status st;
	u8 rbyte;

	err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM | COMM_SPU, byte);
	if (err)
		return err;

	err = ds_wait_status(dev, &st);
	if (err)
		return err;

	err = ds_recv_data(dev, &rbyte, sizeof(rbyte));
	if (err < 0)
		return err;

	ds_start_pulse(dev, PULLUP_PULSE_DURATION);

	return !(byte == rbyte);
}

static int ds_read_byte(struct ds_device *dev, u8 *byte)
{
	int err;
	struct ds_status st;

	err = ds_send_control(dev, COMM_BYTE_IO | COMM_IM , 0xff);
	if (err)
		return err;

	ds_wait_status(dev, &st);

	err = ds_recv_data(dev, byte, sizeof(*byte));
	if (err < 0)
		return err;

	return 0;
}

static int ds_read_block(struct ds_device *dev, u8 *buf, int len)
{
	struct ds_status st;
	int err;

	if (len > 64*1024)
		return -E2BIG;

	memset(buf, 0xFF, len);

	err = ds_send_data(dev, buf, len);
	if (err < 0)
		return err;

	err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | COMM_SPU, len);
	if (err)
		return err;

	ds_wait_status(dev, &st);

	memset(buf, 0x00, len);
	err = ds_recv_data(dev, buf, len);

	return err;
}

static int ds_write_block(struct ds_device *dev, u8 *buf, int len)
{
	int err;
	struct ds_status st;

	err = ds_send_data(dev, buf, len);
	if (err < 0)
		return err;

	ds_wait_status(dev, &st);

	err = ds_send_control(dev, COMM_BLOCK_IO | COMM_IM | COMM_SPU, len);
	if (err)
		return err;

	ds_wait_status(dev, &st);

	err = ds_recv_data(dev, buf, len);
	if (err < 0)
		return err;

	ds_start_pulse(dev, PULLUP_PULSE_DURATION);

	return !(err == len);
}

#if 0

static int ds_search(struct ds_device *dev, u64 init, u64 *buf, u8 id_number, int conditional_search)
{
	int err;
	u16 value, index;
	struct ds_status st;

	memset(buf, 0, sizeof(buf));

	err = ds_send_data(ds_dev, (unsigned char *)&init, 8);
	if (err)
		return err;

	ds_wait_status(ds_dev, &st);

	value = COMM_SEARCH_ACCESS | COMM_IM | COMM_SM | COMM_F | COMM_RTS;
	index = (conditional_search ? 0xEC : 0xF0) | (id_number << 8);
	err = ds_send_control(ds_dev, value, index);
	if (err)
		return err;

	ds_wait_status(ds_dev, &st);

	err = ds_recv_data(ds_dev, (unsigned char *)buf, 8*id_number);
	if (err < 0)
		return err;

	return err/8;
}

static int ds_match_access(struct ds_device *dev, u64 init)
{
	int err;
	struct ds_status st;

	err = ds_send_data(dev, (unsigned char *)&init, sizeof(init));
	if (err)
		return err;

	ds_wait_status(dev, &st);

	err = ds_send_control(dev, COMM_MATCH_ACCESS | COMM_IM | COMM_RST, 0x0055);
	if (err)
		return err;

	ds_wait_status(dev, &st);

	return 0;
}

static int ds_set_path(struct ds_device *dev, u64 init)
{
	int err;
	struct ds_status st;
	u8 buf[9];

	memcpy(buf, &init, 8);
	buf[8] = BRANCH_MAIN;

	err = ds_send_data(dev, buf, sizeof(buf));
	if (err)
		return err;

	ds_wait_status(dev, &st);

	err = ds_send_control(dev, COMM_SET_PATH | COMM_IM | COMM_RST, 0);
	if (err)
		return err;

	ds_wait_status(dev, &st);

	return 0;
}

#endif  /*  0  */

static u8 ds9490r_touch_bit(void *data, u8 bit)
{
	u8 ret;
	struct ds_device *dev = data;

	if (ds_touch_bit(dev, bit, &ret))
		return 0;

	return ret;
}

static void ds9490r_write_bit(void *data, u8 bit)
{
	struct ds_device *dev = data;

	ds_write_bit(dev, bit);
}

static void ds9490r_write_byte(void *data, u8 byte)
{
	struct ds_device *dev = data;

	ds_write_byte(dev, byte);
}

static u8 ds9490r_read_bit(void *data)
{
	struct ds_device *dev = data;
	int err;
	u8 bit = 0;

	err = ds_touch_bit(dev, 1, &bit);
	if (err)
		return 0;

	return bit & 1;
}

static u8 ds9490r_read_byte(void *data)
{
	struct ds_device *dev = data;
	int err;
	u8 byte = 0;

	err = ds_read_byte(dev, &byte);
	if (err)
		return 0;

	return byte;
}

static void ds9490r_write_block(void *data, const u8 *buf, int len)
{
	struct ds_device *dev = data;

	ds_write_block(dev, (u8 *)buf, len);
}

static u8 ds9490r_read_block(void *data, u8 *buf, int len)
{
	struct ds_device *dev = data;
	int err;

	err = ds_read_block(dev, buf, len);
	if (err < 0)
		return 0;

	return len;
}

static u8 ds9490r_reset(void *data)
{
	struct ds_device *dev = data;
	struct ds_status st;
	int err;

	memset(&st, 0, sizeof(st));

	err = ds_reset(dev, &st);
	if (err)
		return 1;

	return 0;
}

static int ds_w1_init(struct ds_device *dev)
{
	memset(&dev->master, 0, sizeof(struct w1_bus_master));

	dev->master.data	= dev;
	dev->master.touch_bit	= &ds9490r_touch_bit;
	dev->master.read_bit	= &ds9490r_read_bit;
	dev->master.write_bit	= &ds9490r_write_bit;
	dev->master.read_byte	= &ds9490r_read_byte;
	dev->master.write_byte	= &ds9490r_write_byte;
	dev->master.read_block	= &ds9490r_read_block;
	dev->master.write_block	= &ds9490r_write_block;
	dev->master.reset_bus	= &ds9490r_reset;

	return w1_add_master_device(&dev->master);
}

static void ds_w1_fini(struct ds_device *dev)
{
	w1_remove_master_device(&dev->master);
}

static int ds_probe(struct usb_interface *intf,
		    const struct usb_device_id *udev_id)
{
	struct usb_device *udev = interface_to_usbdev(intf);
	struct usb_endpoint_descriptor *endpoint;
	struct usb_host_interface *iface_desc;
	struct ds_device *dev;
	int i, err;

	dev = kmalloc(sizeof(struct ds_device), GFP_KERNEL);
	if (!dev) {
		printk(KERN_INFO "Failed to allocate new DS9490R structure.\n");
		return -ENOMEM;
	}
	dev->udev = usb_get_dev(udev);
	if (!dev->udev) {
		err = -ENOMEM;
		goto err_out_free;
	}
	memset(dev->ep, 0, sizeof(dev->ep));

	usb_set_intfdata(intf, dev);

	err = usb_set_interface(dev->udev, intf->altsetting[0].desc.bInterfaceNumber, 3);
	if (err) {
		printk(KERN_ERR "Failed to set alternative setting 3 for %d interface: err=%d.\n",
				intf->altsetting[0].desc.bInterfaceNumber, err);
		goto err_out_clear;
	}

	err = usb_reset_configuration(dev->udev);
	if (err) {
		printk(KERN_ERR "Failed to reset configuration: err=%d.\n", err);
		goto err_out_clear;
	}

	iface_desc = &intf->altsetting[0];
	if (iface_desc->desc.bNumEndpoints != NUM_EP-1) {
		printk(KERN_INFO "Num endpoints=%d. It is not DS9490R.\n", iface_desc->desc.bNumEndpoints);
		err = -EINVAL;
		goto err_out_clear;
	}

	/*
	 * This loop doesn'd show control 0 endpoint,
	 * so we will fill only 1-3 endpoints entry.
	 */
	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
		endpoint = &iface_desc->endpoint[i].desc;

		dev->ep[i+1] = endpoint->bEndpointAddress;
#if 0
		printk("%d: addr=%x, size=%d, dir=%s, type=%x\n",
			i, endpoint->bEndpointAddress, le16_to_cpu(endpoint->wMaxPacketSize),
			(endpoint->bEndpointAddress & USB_DIR_IN)?"IN":"OUT",
			endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
#endif
	}

	err = ds_w1_init(dev);
	if (err)
		goto err_out_clear;

	mutex_lock(&ds_mutex);
	list_add_tail(&dev->ds_entry, &ds_devices);
	mutex_unlock(&ds_mutex);

	return 0;

err_out_clear:
	usb_set_intfdata(intf, NULL);
	usb_put_dev(dev->udev);
err_out_free:
	kfree(dev);
	return err;
}

static void ds_disconnect(struct usb_interface *intf)
{
	struct ds_device *dev;

	dev = usb_get_intfdata(intf);
	if (!dev)
		return;

	mutex_lock(&ds_mutex);
	list_del(&dev->ds_entry);
	mutex_unlock(&ds_mutex);

	ds_w1_fini(dev);

	usb_set_intfdata(intf, NULL);

	usb_put_dev(dev->udev);
	kfree(dev);
}

static int ds_init(void)
{
	int err;

	err = usb_register(&ds_driver);
	if (err) {
		printk(KERN_INFO "Failed to register DS9490R USB device: err=%d.\n", err);
		return err;
	}

	return 0;
}

static void ds_fini(void)
{
	usb_deregister(&ds_driver);
}

module_init(ds_init);
module_exit(ds_fini);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Evgeniy Polyakov <[e-mail]>");
MODULE_DESCRIPTION("DS2490 USB <-> W1 bus master driver (DS9490*)");