staging: wilc1000: Use crc7 in lib/ rather than a private copy
The code in lib/ is the desired polynomial, and even includes the 1-bit left shift in the table rather than needing to code it explicitly. While I'm in Kconfig, add a description of what a WILC1000 is. Kconfig questions that require me to look up a data sheet to find out that I probably don't have one are a pet peeve. Cc: Adham Abozaeid <adham.abozaeid@microchip.com> Cc: linux-wireless@vger.kernel.org Reviewed-by: Ajay Singh <ajay.kathat@microchip.com> Signed-off-by: George Spelvin <lkml@sdf.org> Link: https://lore.kernel.org/r/20200326152251.19094-1-ajay.kathat@microchip.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -2,6 +2,10 @@
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config WILC1000
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tristate
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help
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Add support for the Atmel WILC1000 802.11 b/g/n SoC.
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This provides Wi-FI over an SDIO or SPI interface, and
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is usually found in IoT devices.
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This module only support IEEE 802.11n WiFi.
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config WILC1000_SDIO
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@ -22,6 +26,7 @@ config WILC1000_SPI
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tristate "Atmel WILC1000 SPI (WiFi only)"
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depends on CFG80211 && INET && SPI
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select WILC1000
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select CRC7
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help
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This module adds support for the SPI interface of adapters using
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WILC1000 chipset. The Atmel WILC1000 has a Serial Peripheral
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@ -6,6 +6,7 @@
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#include <linux/clk.h>
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#include <linux/spi/spi.h>
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#include <linux/crc7.h>
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#include "netdev.h"
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#include "cfg80211.h"
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@ -16,64 +17,6 @@ struct wilc_spi {
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static const struct wilc_hif_func wilc_hif_spi;
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/********************************************
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*
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* Crc7
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*
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********************************************/
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static const u8 crc7_syndrome_table[256] = {
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0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f,
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0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77,
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0x19, 0x10, 0x0b, 0x02, 0x3d, 0x34, 0x2f, 0x26,
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0x51, 0x58, 0x43, 0x4a, 0x75, 0x7c, 0x67, 0x6e,
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0x32, 0x3b, 0x20, 0x29, 0x16, 0x1f, 0x04, 0x0d,
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0x7a, 0x73, 0x68, 0x61, 0x5e, 0x57, 0x4c, 0x45,
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0x2b, 0x22, 0x39, 0x30, 0x0f, 0x06, 0x1d, 0x14,
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0x63, 0x6a, 0x71, 0x78, 0x47, 0x4e, 0x55, 0x5c,
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0x64, 0x6d, 0x76, 0x7f, 0x40, 0x49, 0x52, 0x5b,
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0x2c, 0x25, 0x3e, 0x37, 0x08, 0x01, 0x1a, 0x13,
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0x7d, 0x74, 0x6f, 0x66, 0x59, 0x50, 0x4b, 0x42,
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0x35, 0x3c, 0x27, 0x2e, 0x11, 0x18, 0x03, 0x0a,
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0x56, 0x5f, 0x44, 0x4d, 0x72, 0x7b, 0x60, 0x69,
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0x1e, 0x17, 0x0c, 0x05, 0x3a, 0x33, 0x28, 0x21,
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0x4f, 0x46, 0x5d, 0x54, 0x6b, 0x62, 0x79, 0x70,
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0x07, 0x0e, 0x15, 0x1c, 0x23, 0x2a, 0x31, 0x38,
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0x41, 0x48, 0x53, 0x5a, 0x65, 0x6c, 0x77, 0x7e,
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0x09, 0x00, 0x1b, 0x12, 0x2d, 0x24, 0x3f, 0x36,
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0x58, 0x51, 0x4a, 0x43, 0x7c, 0x75, 0x6e, 0x67,
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0x10, 0x19, 0x02, 0x0b, 0x34, 0x3d, 0x26, 0x2f,
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0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c,
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0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04,
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0x6a, 0x63, 0x78, 0x71, 0x4e, 0x47, 0x5c, 0x55,
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0x22, 0x2b, 0x30, 0x39, 0x06, 0x0f, 0x14, 0x1d,
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0x25, 0x2c, 0x37, 0x3e, 0x01, 0x08, 0x13, 0x1a,
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0x6d, 0x64, 0x7f, 0x76, 0x49, 0x40, 0x5b, 0x52,
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0x3c, 0x35, 0x2e, 0x27, 0x18, 0x11, 0x0a, 0x03,
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0x74, 0x7d, 0x66, 0x6f, 0x50, 0x59, 0x42, 0x4b,
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0x17, 0x1e, 0x05, 0x0c, 0x33, 0x3a, 0x21, 0x28,
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0x5f, 0x56, 0x4d, 0x44, 0x7b, 0x72, 0x69, 0x60,
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0x0e, 0x07, 0x1c, 0x15, 0x2a, 0x23, 0x38, 0x31,
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0x46, 0x4f, 0x54, 0x5d, 0x62, 0x6b, 0x70, 0x79
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};
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static u8 crc7_byte(u8 crc, u8 data)
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{
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return crc7_syndrome_table[(crc << 1) ^ data];
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}
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static u8 crc7(u8 crc, const u8 *buffer, u32 len)
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{
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while (len--)
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crc = crc7_byte(crc, *buffer++);
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return crc;
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}
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static u8 wilc_get_crc7(u8 *buffer, u32 len)
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{
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return crc7(0x7f, (const u8 *)buffer, len) << 1;
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}
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/********************************************
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*
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* Spi protocol Function
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@ -403,6 +346,11 @@ static int spi_data_write(struct wilc *wilc, u8 *b, u32 sz)
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* Spi Internal Read/Write Function
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*
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********************************************/
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static u8 wilc_get_crc7(u8 *buffer, u32 len)
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{
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return crc7_be(0xfe, buffer, len);
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}
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static int wilc_spi_single_read(struct wilc *wilc, u8 cmd, u32 adr, void *b,
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u8 clockless)
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{
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