x86/intel_minnow_max.c: Adjust gpio pins based on kernel version

This should adjust the pinouts, at runtime, based on the current
kernel that's in use.  The Linux kernel made a change between
3.17 and 3.18 ( specifically ea584595fc85e65796335033dfca25ed655cd0ed )
that changed the numbering for GPIOs.  This obviously breaks everything
for mraa on the MinnowBoard MAX if you have a 3.18 or newer kernel.

Signed-off-by: John 'Warthog9' Hawley <john.hawley@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

diff --git a/src/x86/intel_minnow_max.c b/src/x86/intel_minnow_max.c
index 163dbfb..8b71588 100644 (file)
--- a/src/x86/intel_minnow_max.c
+++ b/src/x86/intel_minnow_max.c
@@ -24,6 +24,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <sys/utsname.h>
 
 #include "common.h"
 #include "x86/intel_minnow_max.h"
@@ -74,6 +75,10 @@ mraa_board_t*
 mraa_intel_minnow_max()
 {
     mraa_board_t* b = (mraa_board_t*) malloc(sizeof(mraa_board_t));
+
+    struct utsname running_uname;
+    int uname_major, uname_minor, max_pins[27];
+
     if (b == NULL) {
         return NULL;
     }
@@ -95,33 +100,104 @@ mraa_intel_minnow_max()
     if (b->pins == NULL) {
         goto error;
     }
-    mraa_set_pininfo(b,  0, "INVALID",  (mraa_pincapabilities_t){0,0,0,0,0,0,0,0}, -1);
-    mraa_set_pininfo(b,  1, "GND",      (mraa_pincapabilities_t){0,0,0,0,0,0,0,0}, -1);
-    mraa_set_pininfo(b,  2, "GND",      (mraa_pincapabilities_t){0,0,0,0,0,0,0,0}, -1);
-    mraa_set_pininfo(b,  3, "5v",       (mraa_pincapabilities_t){0,0,0,0,0,0,0,0}, -1);
-    mraa_set_pininfo(b,  4, "3.3v",     (mraa_pincapabilities_t){1,0,0,0,0,0,0,0}, -1);
-    mraa_set_pininfo(b,  5, "SPI_CS",   (mraa_pincapabilities_t){1,0,0,0,1,0,0,0}, 220);
-    mraa_set_pininfo(b,  6, "UART1TX",  (mraa_pincapabilities_t){1,0,0,0,0,0,0,1}, 225);
-    mraa_set_pininfo(b,  7, "SPIMISO",  (mraa_pincapabilities_t){1,0,0,0,1,0,0,0}, 221);
-    mraa_set_pininfo(b,  8, "UART1RX",  (mraa_pincapabilities_t){1,0,0,0,0,0,0,1}, 224);
-    mraa_set_pininfo(b,  9, "SPIMOSI",  (mraa_pincapabilities_t){1,0,0,0,1,0,0,0}, 222);
-    mraa_set_pininfo(b, 10, "UART1CT",  (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, 227);
-    mraa_set_pininfo(b, 11, "SPI_CLK",  (mraa_pincapabilities_t){1,0,0,0,0,0,0,1}, 223);
-    mraa_set_pininfo(b, 12, "UART1RT", (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, 226);
-    mraa_set_pininfo(b, 13, "I2C_SCL",  (mraa_pincapabilities_t){1,0,0,0,0,1,0,0}, 243);
-    mraa_set_pininfo(b, 14, "I2S_CLK",  (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, 216);
-    mraa_set_pininfo(b, 15, "I2C_SDA",  (mraa_pincapabilities_t){1,0,0,0,0,1,0,0}, 242);
-    mraa_set_pininfo(b, 16, "I2S_FRM",  (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, 217);
-    mraa_set_pininfo(b, 17, "UART2TX",  (mraa_pincapabilities_t){1,0,0,0,0,0,0,1}, 229);
-    mraa_set_pininfo(b, 18, "I2S_DO",   (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, 219);
-    mraa_set_pininfo(b, 19, "UART2RX",  (mraa_pincapabilities_t){1,0,0,0,0,0,0,1}, 228);
-    mraa_set_pininfo(b, 20, "I2S_DI",   (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, 218);
-    mraa_set_pininfo(b, 21, "S5_0",     (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, 82);
-    mraa_set_pininfo(b, 22, "PWM0",     (mraa_pincapabilities_t){1,0,1,0,0,0,0,0}, 248); // Assume BIOS configured for PWM
-    mraa_set_pininfo(b, 23, "S5_1",     (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, 83);
-    mraa_set_pininfo(b, 24, "PWM1",     (mraa_pincapabilities_t){1,0,1,0,0,0,0,0}, 249); // Assume BIOS configured for PWM
-    mraa_set_pininfo(b, 25, "S5_4",     (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, 84);
-    mraa_set_pininfo(b, 26, "IBL8254",  (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, 208);
+
+    if (uname(&running_uname) != 0) {
+        goto error;
+    }
+
+    sscanf(running_uname.release, "%d.%d", &uname_major, &uname_minor);
+
+    /* if we are on Linux 3.17 or lower they use a 256 max and number the GPIOs down
+     * if we are on 3.18 or higher (ea584595fc85e65796335033dfca25ed655cd0ed)  (for now)
+     * they start at 512 and number down, at some point this is going to change again when
+     * GPIO moves to a radix.
+     */
+    if( uname_major <= 3 && uname_minor <= 17 ){
+       max_pins[0]  =  -1; // INVALID, doesn't exist
+       max_pins[1]  =  -1; // GND
+       max_pins[2]  =  -1; // GND
+       max_pins[3]  =  -1; // 5v
+       max_pins[4]  =  -1; // 3.3v
+       max_pins[5]  = 220; // SPI_CS
+       max_pins[6]  = 225; // UART1TX
+       max_pins[7]  = 221; // SPIMISO
+       max_pins[8]  = 224; // UART1RX
+       max_pins[9]  = 222; // SPIMOSI
+       max_pins[10] = 227; // UART1CT
+       max_pins[11] = 223; // SPI_CLK
+       max_pins[12] = 226; // UART1RT
+       max_pins[13] = 243; // I2C_SCL
+       max_pins[14] = 216; // I2S_CLK
+       max_pins[15] = 242; // I2C_SDA
+       max_pins[16] = 217; // I2S_FRM
+       max_pins[17] = 229; // UART2TX
+       max_pins[18] = 219; // I2S_DO
+       max_pins[19] = 228; // UART2RX
+       max_pins[20] = 218; // I2S_DI
+       max_pins[21] =  82; // S5_0
+       max_pins[22] = 248; // PWM0
+       max_pins[23] =  83; // S5_1
+       max_pins[24] = 249; // PWM1
+       max_pins[25] =  84; // S5_4
+       max_pins[26] = 208; // IBL8254
+    } else {
+       // This is mainly for +3.18
+       max_pins[0]  =  -1; // INVALID, doesn't exist
+       max_pins[1]  =  -1; // GND
+       max_pins[2]  =  -1; // GND
+       max_pins[3]  =  -1; // 5v
+       max_pins[4]  =  -1; // 3.3v
+       max_pins[5]  = 476; // SPI_CS
+       max_pins[6]  = 481; // UART1TX
+       max_pins[7]  = 477; // SPIMISO
+       max_pins[8]  = 480; // UART1RX
+       max_pins[9]  = 478; // SPIMOSI
+       max_pins[10] = 483; // UART1CT
+       max_pins[11] = 479; // SPI_CLK
+       max_pins[12] = 484; // UART1RT
+       max_pins[13] = 499; // I2C_SCL
+       max_pins[14] = 472; // I2S_CLK
+       max_pins[15] = 498; // I2C_SDA
+       max_pins[16] = 473; // I2S_FRM
+       max_pins[17] = 485; // UART2TX
+       max_pins[18] = 475; // I2S_DO
+       max_pins[19] = 484; // UART2RX
+       max_pins[20] = 474; // I2S_DI
+       max_pins[21] = 338; // S5_0
+       max_pins[22] = 504; // PWM0
+       max_pins[23] = 339; // S5_1
+       max_pins[24] = 505; // PWM1
+       max_pins[25] = 340; // S5_4
+       max_pins[26] = 464; // IBL8254
+    }
+
+    mraa_set_pininfo(b,  0, "INVALID",  (mraa_pincapabilities_t){0,0,0,0,0,0,0,0}, max_pins[0]);
+    mraa_set_pininfo(b,  1, "GND",      (mraa_pincapabilities_t){0,0,0,0,0,0,0,0}, max_pins[1]);
+    mraa_set_pininfo(b,  2, "GND",      (mraa_pincapabilities_t){0,0,0,0,0,0,0,0}, max_pins[2]);
+    mraa_set_pininfo(b,  3, "5v",       (mraa_pincapabilities_t){0,0,0,0,0,0,0,0}, max_pins[3]);
+    mraa_set_pininfo(b,  4, "3.3v",     (mraa_pincapabilities_t){1,0,0,0,0,0,0,0}, max_pins[4]);
+    mraa_set_pininfo(b,  5, "SPI_CS",   (mraa_pincapabilities_t){1,0,0,0,1,0,0,0}, max_pins[5]);
+    mraa_set_pininfo(b,  6, "UART1TX",  (mraa_pincapabilities_t){1,0,0,0,0,0,0,1}, max_pins[6]);
+    mraa_set_pininfo(b,  7, "SPIMISO",  (mraa_pincapabilities_t){1,0,0,0,1,0,0,0}, max_pins[7]);
+    mraa_set_pininfo(b,  8, "UART1RX",  (mraa_pincapabilities_t){1,0,0,0,0,0,0,1}, max_pins[8]);
+    mraa_set_pininfo(b,  9, "SPIMOSI",  (mraa_pincapabilities_t){1,0,0,0,1,0,0,0}, max_pins[9]);
+    mraa_set_pininfo(b, 10, "UART1CT",  (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, max_pins[10]);
+    mraa_set_pininfo(b, 11, "SPI_CLK",  (mraa_pincapabilities_t){1,0,0,0,0,0,0,1}, max_pins[11]);
+    mraa_set_pininfo(b, 12, "UART1RT",  (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, max_pins[12]);
+    mraa_set_pininfo(b, 13, "I2C_SCL",  (mraa_pincapabilities_t){1,0,0,0,0,1,0,0}, max_pins[13]);
+    mraa_set_pininfo(b, 14, "I2S_CLK",  (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, max_pins[14]);
+    mraa_set_pininfo(b, 15, "I2C_SDA",  (mraa_pincapabilities_t){1,0,0,0,0,1,0,0}, max_pins[15]);
+    mraa_set_pininfo(b, 16, "I2S_FRM",  (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, max_pins[16]);
+    mraa_set_pininfo(b, 17, "UART2TX",  (mraa_pincapabilities_t){1,0,0,0,0,0,0,1}, max_pins[17]);
+    mraa_set_pininfo(b, 18, "I2S_DO",   (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, max_pins[18]);
+    mraa_set_pininfo(b, 19, "UART2RX",  (mraa_pincapabilities_t){1,0,0,0,0,0,0,1}, max_pins[19]);
+    mraa_set_pininfo(b, 20, "I2S_DI",   (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, max_pins[20]);
+    mraa_set_pininfo(b, 21, "S5_0",     (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, max_pins[21]);
+    mraa_set_pininfo(b, 22, "PWM0",     (mraa_pincapabilities_t){1,0,1,0,0,0,0,0}, max_pins[22]); // Assume BIOS configured for PWM
+    mraa_set_pininfo(b, 23, "S5_1",     (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, max_pins[23]);
+    mraa_set_pininfo(b, 24, "PWM1",     (mraa_pincapabilities_t){1,0,1,0,0,0,0,0}, max_pins[24]); // Assume BIOS configured for PWM
+    mraa_set_pininfo(b, 25, "S5_4",     (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, max_pins[25]);
+    mraa_set_pininfo(b, 26, "IBL8254",  (mraa_pincapabilities_t){1,1,0,0,0,0,0,0}, max_pins[26]);
 
     // Set number of i2c adaptors
     // Got this from running 'i2cdetect -l'