X-Git-Url: https://oss.titaniummirror.com/gitweb?a=blobdiff_plain;f=src%2Fcp210x.c;h=657693992452b406afc7e12290b98490513716c8;hb=b533686218da2e0b6cb59151c130a39dc08a1f64;hp=4b1a29d606e7dae38e26d2bd6ccf41c99477e146;hpb=185ac8c0b94807a01f510f17f45d402f47add83a;p=cp210x.git diff --git a/src/cp210x.c b/src/cp210x.c index 4b1a29d..6576939 100644 --- a/src/cp210x.c +++ b/src/cp210x.c @@ -147,14 +147,6 @@ static struct usb_serial_driver cp210x_device = { .shutdown = cp210x_shutdown, }; -/* Control request types */ -#define REQTYPE_CTL_TO_DEVICE USB_TYPE_VENDOR -#define REQTYPE_CTL_TO_HOST (USB_DIR_IN|REQTYPE_CTL_TO_DEVICE) - -/* Config request types */ -#define REQTYPE_HOST_TO_DEVICE (USB_TYPE_VENDOR|USB_RECIP_INTERFACE) -#define REQTYPE_DEVICE_TO_HOST (USB_DIR_IN|REQTYPE_HOST_TO_DEVICE) - /* Config SET requests. To GET, add 1 to the request number */ #define CP2101_UART 0x00 /* Enable / Disable */ #define CP2101_BAUDRATE 0x01 /* (BAUD_RATE_GEN_FREQ / baudrate) */ @@ -211,37 +203,94 @@ static struct usb_serial_driver cp210x_device = { #define CP210x_PART_CP2102 0x02 #define CP210x_PART_CP2103 0x03 -/* Helper to make usb string size */ -#define USBSTRLEN(x) (x * 2 + 2) +/* Taken from drivers/usb/gadget/usbstring.c */ +static int utf8_to_utf16le(const char *s, __le16 *cp, unsigned len) +{ + int count = 0; + u8 c; + u16 uchar; + + /* this insists on correct encodings, though not minimal ones. + * BUT it currently rejects legit 4-byte UTF-8 code points, + * which need surrogate pairs. (Unicode 3.1 can use them.) + */ + while (len != 0 && (c = (u8) *s++) != 0) { + if (unlikely(c & 0x80)) { + // 2-byte sequence: + // 00000yyyyyxxxxxx = 110yyyyy 10xxxxxx + if ((c & 0xe0) == 0xc0) { + uchar = (c & 0x1f) << 6; + + c = (u8) *s++; + if ((c & 0xc0) != 0x80) + goto fail; + c &= 0x3f; + uchar |= c; + + // 3-byte sequence (most CJKV characters): + // zzzzyyyyyyxxxxxx = 1110zzzz 10yyyyyy 10xxxxxx + } else if ((c & 0xf0) == 0xe0) { + uchar = (c & 0x0f) << 12; + + c = (u8) *s++; + if ((c & 0xc0) != 0x80) + goto fail; + c &= 0x3f; + uchar |= c << 6; + + c = (u8) *s++; + if ((c & 0xc0) != 0x80) + goto fail; + c &= 0x3f; + uchar |= c; + + /* no bogus surrogates */ + if (0xd800 <= uchar && uchar <= 0xdfff) + goto fail; + + // 4-byte sequence (surrogate pairs, currently rare): + // 11101110wwwwzzzzyy + 110111yyyyxxxxxx + // = 11110uuu 10uuzzzz 10yyyyyy 10xxxxxx + // (uuuuu = wwww + 1) + // FIXME accept the surrogate code points (only) + + } else + goto fail; + } else + uchar = c; + *cp++ = uchar; + count++; + len--; + } + return count; +fail: + return -1; +} -/* Populates usbstr with: (len) + (0x03) + unicode(str). Each char in str - * takes two bytes in unicode format. - * Returns the resulting length of the string in usbstr. + +/* + * make_usb_string + * Populates usbstr with: (len) + (USB_DT_STRING) + unicode(str). Each char in + * usbstr consumes two bytes in unicode (__le16) format. + * Returns the resulting length of usbstr in bytes. * This function can accept overlapping usbstr and str as long as the overlap * does not cause data written to usbstr to overwrite data not yet read from * str. */ -static int make_usb_string(char *usbstr, size_t usblen, char *src, +static int make_usb_string(__le16* usbstr, size_t usblen, const char *src, size_t srclen) { - int len = 0; - - if (usbstr && usblen >= 2 && src && *src && srclen) { - char *p; - - if (usblen > 255) - usblen = 255; - - p = usbstr + 1; - *p++ = 0x03; - len = 2; - while (srclen && len < usblen) { - *p++ = *src++; - *p++ = 0; - len += 2; - srclen--; - } - *usbstr = (char)len; + int len; + + /* string descriptors have length, type, then UTF16-LE text */ + if (usblen > 254) + usblen = 254; + len = min(usblen / 2 - 1, srclen); + len = utf8_to_utf16le(src, usbstr + 1, len); + if (len >= 0) { + len = (len + 1) * 2; + ((u8 *)usbstr)[0] = len; + ((u8 *)usbstr)[1] = USB_DT_STRING; } return len; } @@ -252,39 +301,26 @@ static int make_usb_string(char *usbstr, size_t usblen, char *src, * is the size of the buffer at kbuf. * Returns the number of bytes used in kbuf. */ -static size_t cp210x_usbstr_from_user(char *kbuf, unsigned long ubuf, - size_t klen) +static size_t cp210x_usbstr_from_user(__le16 *kbuf, + struct cp210x_buffer __user *ubuf, size_t klen) { struct cp210x_buffer t; char *str; size_t slen; - if (!kbuf || !ubuf || !klen) - return 0; - if (copy_from_user(&t, (struct cp210x_buffer __user *)ubuf, sizeof(t))) - return 0; - if (!t.buf || !t.len || USBSTRLEN(t.len) > klen) - return 0; - slen = (klen - 2) / 2; + if (copy_from_user(&t, ubuf, sizeof(t))) + return -EINVAL; + slen = klen / 2 - 1; + if (!t.buf || !t.len || t.len > slen) + return -EINVAL; if (t.len < slen) slen = t.len; - str = kbuf + klen - slen; - if (copy_from_user(str, (u8 __user *)t.buf, slen)) - return 0; + str = (char *)kbuf + klen - slen; + if (copy_from_user(str, (__u8 __user *)t.buf, slen)) + return -EINVAL; return make_usb_string(kbuf, klen, str, slen); } -/* cp210x_has_setmfg - * Returns 1 if the CP210X part includes firmware that allows setting the - * USB MFG descriptor, else 0. As of this writing, no CP210X firmware allows - * this. SiLabs has suggested this may change in future firmware versions or - * parts. - */ -static inline int cp210x_has_setmfg(void) -{ - return 0; -} - /* * cp210x_ctlmsg * A generic usb control message interface. @@ -328,7 +364,7 @@ static int cp210x_reset(struct usb_serial_port *port) /* Instructing the CP210X to reset seems to work more reliably than * calling usb_reset_device(). */ - cp210x_ctlmsg(port, 0xff, REQTYPE_CTL_TO_DEVICE, + cp210x_ctlmsg(port, 0xff, USB_TYPE_VENDOR, 0x0008, 0x00, NULL, 0); return 0; } @@ -346,7 +382,8 @@ static int cp210x_get_partnum(struct usb_serial_port *port) _partnum = CP210x_PART_CP2101; else if (addr == 0x01) { /* Must query part to determine part number */ - if (cp210x_ctlmsg(port, 0xff, REQTYPE_CTL_TO_HOST, + if (cp210x_ctlmsg(port, 0xff, + USB_DIR_IN|USB_TYPE_VENDOR, 0x370b, 0x00, &_partnum, 1) != 1) _partnum = CP210x_PART_UNKNOWN; } @@ -358,7 +395,7 @@ static int cp210x_get_partnum(struct usb_serial_port *port) static inline int cp210x_setu16(struct usb_serial_port *port, int cmd, unsigned int value) { - return cp210x_ctlmsg(port, 0xff, REQTYPE_CTL_TO_DEVICE, + return cp210x_ctlmsg(port, 0xff, USB_TYPE_VENDOR, 0x3700 | (cmd & 0xff), value, NULL, 0); } @@ -368,10 +405,10 @@ static inline int cp210x_setu16(struct usb_serial_port *port, int cmd, * Set a USB string descriptor using proprietary cp210x control messages. * Return the number of characters actually written. */ -static int cp210x_setstr(struct usb_serial_port *port, int cmd, char *usbstr) +static int cp210x_setstr(struct usb_serial_port *port, int cmd, __le16 *usbstr) { - unsigned len = usbstr[0]; - int ret = cp210x_ctlmsg(port, 0xff, REQTYPE_CTL_TO_DEVICE, + int len = ((u8 *)usbstr)[0]; + int ret = cp210x_ctlmsg(port, 0xff, USB_TYPE_VENDOR, 0x3700 | (cmd & 0xff), 0, usbstr, len); dbg("%s - cmd 0x%02x len %d ret %d", __FUNCTION__, cmd, len, ret); return ret; @@ -382,7 +419,7 @@ static int cp210x_gpioset(struct usb_serial_port *port, u8 gpio) { dbg("%s - port %d, gpio = 0x%.2x", __FUNCTION__, port->number, gpio); - return cp210x_ctlmsg(port, 0xff, REQTYPE_CTL_TO_DEVICE, + return cp210x_ctlmsg(port, 0xff, USB_TYPE_VENDOR, 0x37e1, ((uint16_t)gpio << 8) | GPIO_MASK, NULL, 0); } @@ -411,7 +448,7 @@ static int cp210x_gpiosetb(struct usb_serial_port *port, u8 set, u8 clear) dbg("%s - port %d, gpiob = 0x%.4x", __FUNCTION__, port->number, gpio); - return cp210x_ctlmsg(port, 0xff, REQTYPE_CTL_TO_DEVICE, + return cp210x_ctlmsg(port, 0xff, USB_TYPE_VENDOR, 0x37e1, gpio, NULL, 0); } @@ -421,7 +458,7 @@ static int cp210x_gpioget(struct usb_serial_port *port, u8 *gpio) dbg("%s - port %d", __FUNCTION__, port->number); - ret = cp210x_ctlmsg(port, 0xff, REQTYPE_CTL_TO_HOST, + ret = cp210x_ctlmsg(port, 0xff, USB_DIR_IN|USB_TYPE_VENDOR, 0x00c2, 0, gpio, 1); dbg("%s - gpio = 0x%.2x (%d)", __FUNCTION__, *gpio, ret); @@ -448,7 +485,7 @@ static int cp210x_portconfset(struct usb_serial_port *port, lconfig.suspend.lowPower = 0; lconfig.reset.lowPower = 0; - ret = cp210x_ctlmsg(port, 0xff, REQTYPE_CTL_TO_DEVICE, 0x370c, + ret = cp210x_ctlmsg(port, 0xff, USB_TYPE_VENDOR, 0x370c, 0, &lconfig, sizeof(struct cp210x_port_config)); if (ret == sizeof(struct cp210x_port_config)) return 0; @@ -465,7 +502,7 @@ static int cp210x_portconfget(struct usb_serial_port *port, dbg("%s", __FUNCTION__); - ret = cp210x_ctlmsg(port, 0xff, REQTYPE_CTL_TO_HOST, + ret = cp210x_ctlmsg(port, 0xff, USB_DIR_IN|USB_TYPE_VENDOR, 0x370c, 0, config, sizeof(struct cp210x_port_config)); if (ret == sizeof(struct cp210x_port_config)) { /* Words from cp210x are MSB */ @@ -517,8 +554,9 @@ static int cp210x_get_config(struct usb_serial_port *port, u8 request, /* Issue the request, attempting to read 'size' bytes */ result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), - request, REQTYPE_DEVICE_TO_HOST, 0x0000, - 0, buf, size, 300); + request, + USB_DIR_IN|USB_TYPE_VENDOR|USB_RECIP_INTERFACE, + 0x0000, 0, buf, size, 300); /* Convert data into an array of integers */ for (i = 0; i < length; i++) @@ -565,13 +603,13 @@ static int cp210x_set_config(struct usb_serial_port *port, u8 request, if (size > 2) { result = usb_control_msg(serial->dev, - usb_sndctrlpipe(serial->dev, 0), - request, REQTYPE_HOST_TO_DEVICE, 0x0000, + usb_sndctrlpipe(serial->dev, 0), request, + USB_TYPE_VENDOR|USB_RECIP_INTERFACE, 0x0000, 0, buf, size, 300); } else { result = usb_control_msg(serial->dev, - usb_sndctrlpipe(serial->dev, 0), - request, REQTYPE_HOST_TO_DEVICE, data[0], + usb_sndctrlpipe(serial->dev, 0), request, + USB_TYPE_VENDOR|USB_RECIP_INTERFACE, data[0], 0, NULL, 0, 300); } @@ -699,7 +737,8 @@ static int cp210x_ioctl(struct usb_serial_port *port, struct file *file, if (cp210x_get_partnum(port) == CP210x_PART_CP2103) { u8 gpio = 0; if (!cp210x_gpioget(port, &gpio) && !copy_to_user( - (u8 __user *)arg, &gpio, sizeof(gpio))) + (__u8 __user *)arg, &gpio, + sizeof(gpio))) return 0; } return -EFAULT; @@ -770,23 +809,13 @@ static int cp210x_ioctl(struct usb_serial_port *port, struct file *file, } break; - case CP210x_IOCTL_SETMFG: - if (cp210x_has_setmfg()) { - char usbstr[USBSTRLEN(CP210x_MAX_MFG_STRLEN)]; - size_t len = cp210x_usbstr_from_user(usbstr, arg, - sizeof(usbstr)); - if (len && cp210x_setstr(port, 0x00, usbstr) == len) - return 0; - } - return -EFAULT; - break; - case CP210x_IOCTL_SETPRODUCT: { - char usbstr[USBSTRLEN(CP210x_MAX_PRODUCT_STRLEN)]; - size_t len = cp210x_usbstr_from_user(usbstr, arg, + __le16 usbstr[CP210x_MAX_PRODUCT_STRLEN + 1]; + size_t len = cp210x_usbstr_from_user(usbstr, + (struct cp210x_buffer __user *)arg, sizeof(usbstr)); - if (len && cp210x_setstr(port, 0x03, usbstr) == len) + if (len > 0 && cp210x_setstr(port, 0x03, usbstr) == len) return 0; return -EFAULT; } @@ -794,10 +823,11 @@ static int cp210x_ioctl(struct usb_serial_port *port, struct file *file, case CP210x_IOCTL_SETSERIAL: { - char usbstr[USBSTRLEN(CP210x_MAX_SERIAL_STRLEN)]; - size_t len = cp210x_usbstr_from_user(usbstr, arg, + __le16 usbstr[CP210x_MAX_SERIAL_STRLEN + 1]; + size_t len = cp210x_usbstr_from_user(usbstr, + (struct cp210x_buffer __user *)arg, sizeof(usbstr)); - if (len && cp210x_setstr(port, 0x04, usbstr) == len) + if (len > 0 && cp210x_setstr(port, 0x04, usbstr) == len) return 0; return -EFAULT; }