cmd_i2c.c: added i2c read to memory function

Signed-off-by: Frans Meulenbroeks <fransmeulenbroeks@gmail.com>

diff --git a/common/cmd_i2c.c b/common/cmd_i2c.c
index b51d0c91c504277c627690603e521840c251306d..ee9577cb61f64cfaba9da23e05e3e312e8f81058 100644 (file)
--- a/common/cmd_i2c.c
+++ b/common/cmd_i2c.c
@@ -154,6 +154,63 @@ int i2c_set_bus_speed(unsigned int)
  */
 #define DISP_LINE_LEN  16
 
+/*
+ * Syntax:
+ *     i2c read {i2c_chip} {devaddr}{.0, .1, .2} {len} {memaddr}
+ */
+
+int do_i2c_read ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+       u_char  chip;
+       uint    devaddr, alen, length;
+       u_char  *memaddr;
+       int     j;
+
+       if (argc != 5) {
+               cmd_usage(cmdtp);
+               return 1;
+       }
+
+       /*
+        * I2C chip address
+        */
+       chip = simple_strtoul(argv[1], NULL, 16);
+
+       /*
+        * I2C data address within the chip.  This can be 1 or
+        * 2 bytes long.  Some day it might be 3 bytes long :-).
+        */
+       devaddr = simple_strtoul(argv[2], NULL, 16);
+       alen = 1;
+       for (j = 0; j < 8; j++) {
+               if (argv[2][j] == '.') {
+                       alen = argv[2][j+1] - '0';
+                       if (alen > 3) {
+                               cmd_usage(cmdtp);
+                               return 1;
+                       }
+                       break;
+               } else if (argv[2][j] == '\0')
+                       break;
+       }
+
+       /*
+        * Length is the number of objects, not number of bytes.
+        */
+       length = simple_strtoul(argv[3], NULL, 16);
+
+       /*
+        * memaddr is the address where to store things in memory
+        */
+       memaddr = (u_char *)simple_strtoul(argv[4], NULL, 16);
+
+       if (i2c_read(chip, devaddr, alen, memaddr, length) != 0) {
+               puts ("Error reading the chip.\n");
+               return 1;
+       }
+       return 0;
+}
+
 int do_i2c_md ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 {
        u_char  chip;
@@ -1272,6 +1329,7 @@ static cmd_tbl_t cmd_i2c_sub[] = {
        U_BOOT_CMD_MKENT(mw, 3, 1, do_i2c_mw, "", ""),
        U_BOOT_CMD_MKENT(nm, 2, 1, do_i2c_nm, "", ""),
        U_BOOT_CMD_MKENT(probe, 0, 1, do_i2c_probe, "", ""),
+       U_BOOT_CMD_MKENT(read, 5, 1, do_i2c_read, "", ""),
        U_BOOT_CMD_MKENT(reset, 0, 1, do_i2c_reset, "", ""),
 #if defined(CONFIG_CMD_SDRAM)
        U_BOOT_CMD_MKENT(sdram, 1, 1, do_sdram, "", ""),
@@ -1315,6 +1373,7 @@ U_BOOT_CMD(
        "i2c mw chip address[.0, .1, .2] value [count] - write to I2C device (fill)\n"
        "i2c nm chip address[.0, .1, .2] - write to I2C device (constant address)\n"
        "i2c probe - show devices on the I2C bus\n"
+       "i2c read chip address[.0, .1, .2] length memaddress - read to memory \n"
        "i2c reset - re-init the I2C Controller\n"
 #if defined(CONFIG_CMD_SDRAM)
        "i2c sdram chip - print SDRAM configuration information\n"
@@ -1323,7 +1382,6 @@ U_BOOT_CMD(
 );
 
 #if defined(CONFIG_I2C_MUX)
-
 int i2c_mux_add_device(I2C_MUX_DEVICE *dev)
 {
        I2C_MUX_DEVICE  *devtmp = i2c_mux_devices;