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Linux/arch/arm/mach-ux500/board-mop500-uib.c

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  1 /*
  2  * Copyright (C) ST-Ericsson SA 2010
  3  *
  4  * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
  5  * License terms: GNU General Public License (GPL), version 2
  6  */
  7 
  8 #define pr_fmt(fmt)     "mop500-uib: " fmt
  9 
 10 #include <linux/kernel.h>
 11 #include <linux/init.h>
 12 #include <linux/i2c.h>
 13 
 14 #include <mach/hardware.h>
 15 #include "board-mop500.h"
 16 
 17 enum mop500_uib {
 18         STUIB,
 19         U8500UIB,
 20 };
 21 
 22 struct uib {
 23         const char *name;
 24         const char *option;
 25         void (*init)(void);
 26 };
 27 
 28 static struct uib __initdata mop500_uibs[] = {
 29         [STUIB] = {
 30                 .name   = "ST-UIB",
 31                 .option = "stuib",
 32                 .init   = mop500_stuib_init,
 33         },
 34         [U8500UIB] = {
 35                 .name   = "U8500-UIB",
 36                 .option = "u8500uib",
 37                 .init   = mop500_u8500uib_init,
 38         },
 39 };
 40 
 41 static struct uib *mop500_uib;
 42 
 43 static int __init mop500_uib_setup(char *str)
 44 {
 45         int i;
 46 
 47         for (i = 0; i < ARRAY_SIZE(mop500_uibs); i++) {
 48                 struct uib *uib = &mop500_uibs[i];
 49 
 50                 if (!strcmp(str, uib->option)) {
 51                         mop500_uib = uib;
 52                         break;
 53                 }
 54         }
 55 
 56         if (i == ARRAY_SIZE(mop500_uibs))
 57                 pr_err("invalid uib= option (%s)\n", str);
 58 
 59         return 1;
 60 }
 61 __setup("uib=", mop500_uib_setup);
 62 
 63 /*
 64  * The UIBs are detected after the I2C host controllers are registered, so
 65  * i2c_register_board_info() can't be used.
 66  */
 67 void mop500_uib_i2c_add(int busnum, struct i2c_board_info *info,
 68                 unsigned n)
 69 {
 70         struct i2c_adapter *adap;
 71         struct i2c_client *client;
 72         int i;
 73 
 74         adap = i2c_get_adapter(busnum);
 75         if (!adap) {
 76                 pr_err("failed to get adapter i2c%d\n", busnum);
 77                 return;
 78         }
 79 
 80         for (i = 0; i < n; i++) {
 81                 client = i2c_new_device(adap, &info[i]);
 82                 if (!client)
 83                         pr_err("failed to register %s to i2c%d\n",
 84                                         info[i].type, busnum);
 85         }
 86 
 87         i2c_put_adapter(adap);
 88 }
 89 
 90 static void __init __mop500_uib_init(struct uib *uib, const char *why)
 91 {
 92         pr_info("%s (%s)\n", uib->name, why);
 93         uib->init();
 94 }
 95 
 96 /*
 97  * Detect the UIB attached based on the presence or absence of i2c devices.
 98  */
 99 int __init mop500_uib_init(void)
100 {
101         struct uib *uib = mop500_uib;
102         struct i2c_adapter *i2c0;
103         int ret;
104 
105         if (!cpu_is_u8500_family())
106                 return -ENODEV;
107 
108         if (uib) {
109                 __mop500_uib_init(uib, "from uib= boot argument");
110                 return 0;
111         }
112 
113         i2c0 = i2c_get_adapter(0);
114         if (!i2c0) {
115                 __mop500_uib_init(&mop500_uibs[STUIB],
116                                 "fallback, could not get i2c0");
117                 return -ENODEV;
118         }
119 
120         /* U8500-UIB has the TC35893 at 0x44 on I2C0, the ST-UIB doesn't. */
121         ret = i2c_smbus_xfer(i2c0, 0x44, 0, I2C_SMBUS_WRITE, 0,
122                         I2C_SMBUS_QUICK, NULL);
123         i2c_put_adapter(i2c0);
124 
125         if (ret == 0)
126                 uib = &mop500_uibs[U8500UIB];
127         else
128                 uib = &mop500_uibs[STUIB];
129 
130         __mop500_uib_init(uib, "detected");
131 
132         return 0;
133 }
134 

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