projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 705e0984 RV |
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 | ||
| 58402b6e | 28 | static struct uib __initdata mop500_uibs[] = { |
| 705e0984 RV |
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 | */ | |
| fd6948bb | 99 | int __init mop500_uib_init(void) |
| 705e0984 RV |
100 | { |
| 101 | struct uib *uib = mop500_uib; | |
| 102 | struct i2c_adapter *i2c0; | |
| 103 | int ret; | |
| 104 | ||
| bc71c096 | 105 | if (!cpu_is_u8500_family()) |
| 705e0984 RV |
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 | } |