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Commit 4ac37208 authored by Simon Arlott's avatar Simon Arlott Committed by Greg Kroah-Hartman
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USB: cxacru: add write-only sysfs attribute for modem configuration 

The modem can be configured using CM_REQUEST_CARD_DATA_SET,
although CM_REQUEST_CARD_DATA_GET does not return any data.

Tested by setting the modulation (0x0a) option.

There is a list of parameters in the following archive,
but the meaning of many of them is not well documented:
  http://sourceforge.net/project/shownotes.php?release_id=301825



This source also indicates that the highest parameter set
is 0x4a but this varies by model so an arbitrary limit of
0x7f has been used (the index is a 32-bit integer).

Signed-off-by: default avatarSimon Arlott <simon@fire.lp0.eu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 885582c4

Documentation/networking/cxacru.txt

+9 −0
Original line number Diff line number Diff line
@@ -15,6 +15,15 @@ several sysfs attribute files for retrieving device statistics: 
* adsl_headend_environment

	Information about the remote headend.



* adsl_config

	Configuration writing interface.

	Write parameters in hexadecimal format <index>=<value>,

	separated by whitespace, e.g.:

		"1=0 a=5"

	Up to 7 parameters at a time will be sent and the modem will restart

	the ADSL connection when any value is set. These are logged for future

	reference.



* downstream_attenuation (dB)

* downstream_bits_per_frame

* downstream_rate (kbps)

drivers/usb/atm/cxacru.c

+75 −1
Original line number Diff line number Diff line
@@ -52,6 +52,7 @@ static const char cxacru_driver_name[] = "cxacru"; 
#define CXACRU_EP_DATA		0x02	/* Bulk in/out */



#define CMD_PACKET_SIZE		64	/* Should be maxpacket(ep)? */

#define CMD_MAX_CONFIG		((CMD_PACKET_SIZE / 4 - 1) / 2)



/* Addresses */

#define PLLFCLK_ADDR	0x00350068
@@ -216,6 +217,10 @@ static DEVICE_ATTR(_name, S_IRUGO, cxacru_sysfs_show_##_name, NULL) 
static DEVICE_ATTR(_name, S_IWUSR | S_IRUGO, \

	cxacru_sysfs_show_##_name, cxacru_sysfs_store_##_name)



#define CXACRU_SET_INIT(_name) \

static DEVICE_ATTR(_name, S_IWUSR, \

	NULL, cxacru_sysfs_store_##_name)



#define CXACRU_ATTR_INIT(_value, _type, _name) \

static ssize_t cxacru_sysfs_show_##_name(struct device *dev, \

	struct device_attribute *attr, char *buf) \
@@ -232,10 +237,12 @@ CXACRU__ATTR_INIT(_name) 


#define CXACRU_ATTR_CREATE(_v, _t, _name) CXACRU_DEVICE_CREATE_FILE(_name)

#define CXACRU_CMD_CREATE(_name)          CXACRU_DEVICE_CREATE_FILE(_name)

#define CXACRU_SET_CREATE(_name)          CXACRU_DEVICE_CREATE_FILE(_name)

#define CXACRU__ATTR_CREATE(_name)        CXACRU_DEVICE_CREATE_FILE(_name)



#define CXACRU_ATTR_REMOVE(_v, _t, _name) CXACRU_DEVICE_REMOVE_FILE(_name)

#define CXACRU_CMD_REMOVE(_name)          CXACRU_DEVICE_REMOVE_FILE(_name)

#define CXACRU_SET_REMOVE(_name)          CXACRU_DEVICE_REMOVE_FILE(_name)

#define CXACRU__ATTR_REMOVE(_name)        CXACRU_DEVICE_REMOVE_FILE(_name)



static ssize_t cxacru_sysfs_showattr_u32(u32 value, char *buf)
@@ -438,6 +445,72 @@ static ssize_t cxacru_sysfs_store_adsl_state(struct device *dev, 
	return ret;

}



/* CM_REQUEST_CARD_DATA_GET times out, so no show attribute */



static ssize_t cxacru_sysfs_store_adsl_config(struct device *dev,

	struct device_attribute *attr, const char *buf, size_t count)

{

	struct cxacru_data *instance = to_usbatm_driver_data(

			to_usb_interface(dev));

	int len = strlen(buf);

	int ret, pos, num;

	__le32 data[CMD_PACKET_SIZE / 4];



	if (!capable(CAP_NET_ADMIN))

		return -EACCES;



	if (instance == NULL)

		return -ENODEV;



	pos = 0;

	num = 0;

	while (pos < len) {

		int tmp;

		u32 index;

		u32 value;



		ret = sscanf(buf + pos, "%x=%x%n", &index, &value, &tmp);

		if (ret < 2)

			return -EINVAL;

		if (index < 0 || index > 0x7f)

			return -EINVAL;

		pos += tmp;



		/* skip trailing newline */

		if (buf[pos] == '\n' && pos == len-1)

			pos++;



		data[num * 2 + 1] = cpu_to_le32(index);

		data[num * 2 + 2] = cpu_to_le32(value);

		num++;



		/* send config values when data buffer is full

		 * or no more data

		 */

		if (pos >= len || num >= CMD_MAX_CONFIG) {

			char log[CMD_MAX_CONFIG * 12 + 1]; /* %02x=%08x */



			data[0] = cpu_to_le32(num);

			ret = cxacru_cm(instance, CM_REQUEST_CARD_DATA_SET,

				(u8 *) data, 4 + num * 8, NULL, 0);

			if (ret < 0) {

				atm_err(instance->usbatm,

					"set card data returned %d\n", ret);

				return -EIO;

			}



			for (tmp = 0; tmp < num; tmp++)

				snprintf(log + tmp*12, 13, " %02x=%08x",

					le32_to_cpu(data[tmp * 2 + 1]),

					le32_to_cpu(data[tmp * 2 + 2]));

			atm_info(instance->usbatm, "config%s\n", log);

			num = 0;

		}

	}



	return len;

}



/*

 * All device attributes are included in CXACRU_ALL_FILES

 * so that the same list can be used multiple times:
@@ -473,7 +546,8 @@ CXACRU_ATTR_##_action(CXINF_MODULATION, MODU, modulation); \ 
CXACRU_ATTR_##_action(CXINF_ADSL_HEADEND,              u32,  adsl_headend); \

CXACRU_ATTR_##_action(CXINF_ADSL_HEADEND_ENVIRONMENT,  u32,  adsl_headend_environment); \

CXACRU_ATTR_##_action(CXINF_CONTROLLER_VERSION,        u32,  adsl_controller_version); \

CXACRU_CMD_##_action(                                        adsl_state);

CXACRU_CMD_##_action(                                        adsl_state); \

CXACRU_SET_##_action(                                        adsl_config);



CXACRU_ALL_FILES(INIT);