AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 1 | /* |
| 2 | * tps65217.c |
| 3 | * |
| 4 | * TPS65217 chip family multi-function driver |
| 5 | * |
| 6 | * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License as |
| 10 | * published by the Free Software Foundation version 2. |
| 11 | * |
| 12 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any |
| 13 | * kind, whether express or implied; without even the implied warranty |
| 14 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/device.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/platform_device.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/i2c.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <linux/regmap.h> |
| 26 | #include <linux/err.h> |
| 27 | |
| 28 | #include <linux/mfd/core.h> |
| 29 | #include <linux/mfd/tps65217.h> |
| 30 | |
| 31 | /** |
| 32 | * tps65217_reg_read: Read a single tps65217 register. |
| 33 | * |
| 34 | * @tps: Device to read from. |
| 35 | * @reg: Register to read. |
| 36 | * @val: Contians the value |
| 37 | */ |
| 38 | int tps65217_reg_read(struct tps65217 *tps, unsigned int reg, |
| 39 | unsigned int *val) |
| 40 | { |
| 41 | return regmap_read(tps->regmap, reg, val); |
| 42 | } |
| 43 | EXPORT_SYMBOL_GPL(tps65217_reg_read); |
| 44 | |
| 45 | /** |
| 46 | * tps65217_reg_write: Write a single tps65217 register. |
| 47 | * |
| 48 | * @tps65217: Device to write to. |
| 49 | * @reg: Register to write to. |
| 50 | * @val: Value to write. |
| 51 | * @level: Password protected level |
| 52 | */ |
| 53 | int tps65217_reg_write(struct tps65217 *tps, unsigned int reg, |
| 54 | unsigned int val, unsigned int level) |
| 55 | { |
| 56 | int ret; |
| 57 | unsigned int xor_reg_val; |
| 58 | |
| 59 | switch (level) { |
| 60 | case TPS65217_PROTECT_NONE: |
| 61 | return regmap_write(tps->regmap, reg, val); |
| 62 | case TPS65217_PROTECT_L1: |
| 63 | xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK; |
| 64 | ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD, |
| 65 | xor_reg_val); |
| 66 | if (ret < 0) |
| 67 | return ret; |
| 68 | |
| 69 | return regmap_write(tps->regmap, reg, val); |
| 70 | case TPS65217_PROTECT_L2: |
| 71 | xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK; |
| 72 | ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD, |
| 73 | xor_reg_val); |
| 74 | if (ret < 0) |
| 75 | return ret; |
| 76 | ret = regmap_write(tps->regmap, reg, val); |
| 77 | if (ret < 0) |
| 78 | return ret; |
| 79 | ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD, |
| 80 | xor_reg_val); |
| 81 | if (ret < 0) |
| 82 | return ret; |
| 83 | return regmap_write(tps->regmap, reg, val); |
| 84 | default: |
| 85 | return -EINVAL; |
| 86 | } |
| 87 | } |
| 88 | EXPORT_SYMBOL_GPL(tps65217_reg_write); |
| 89 | |
| 90 | /** |
| 91 | * tps65217_update_bits: Modify bits w.r.t mask, val and level. |
| 92 | * |
| 93 | * @tps65217: Device to write to. |
| 94 | * @reg: Register to read-write to. |
| 95 | * @mask: Mask. |
| 96 | * @val: Value to write. |
| 97 | * @level: Password protected level |
| 98 | */ |
Mark Brown | 27757e8 | 2012-05-09 21:18:05 +0100 | [diff] [blame] | 99 | static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg, |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 100 | unsigned int mask, unsigned int val, unsigned int level) |
| 101 | { |
| 102 | int ret; |
| 103 | unsigned int data; |
| 104 | |
| 105 | ret = tps65217_reg_read(tps, reg, &data); |
| 106 | if (ret) { |
| 107 | dev_err(tps->dev, "Read from reg 0x%x failed\n", reg); |
| 108 | return ret; |
| 109 | } |
| 110 | |
| 111 | data &= ~mask; |
| 112 | data |= val & mask; |
| 113 | |
| 114 | ret = tps65217_reg_write(tps, reg, data, level); |
| 115 | if (ret) |
| 116 | dev_err(tps->dev, "Write for reg 0x%x failed\n", reg); |
| 117 | |
| 118 | return ret; |
| 119 | } |
| 120 | |
| 121 | int tps65217_set_bits(struct tps65217 *tps, unsigned int reg, |
| 122 | unsigned int mask, unsigned int val, unsigned int level) |
| 123 | { |
| 124 | return tps65217_update_bits(tps, reg, mask, val, level); |
| 125 | } |
| 126 | EXPORT_SYMBOL_GPL(tps65217_set_bits); |
| 127 | |
| 128 | int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg, |
| 129 | unsigned int mask, unsigned int level) |
| 130 | { |
| 131 | return tps65217_update_bits(tps, reg, mask, 0, level); |
| 132 | } |
| 133 | EXPORT_SYMBOL_GPL(tps65217_clear_bits); |
| 134 | |
| 135 | static struct regmap_config tps65217_regmap_config = { |
| 136 | .reg_bits = 8, |
| 137 | .val_bits = 8, |
| 138 | }; |
| 139 | |
| 140 | static int __devinit tps65217_probe(struct i2c_client *client, |
| 141 | const struct i2c_device_id *ids) |
| 142 | { |
| 143 | struct tps65217 *tps; |
| 144 | struct tps65217_board *pdata = client->dev.platform_data; |
| 145 | int i, ret; |
| 146 | unsigned int version; |
| 147 | |
| 148 | tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); |
| 149 | if (!tps) |
| 150 | return -ENOMEM; |
| 151 | |
| 152 | tps->pdata = pdata; |
Axel Lin | 0ef4619 | 2012-04-25 10:06:40 +0800 | [diff] [blame] | 153 | tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config); |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 154 | if (IS_ERR(tps->regmap)) { |
| 155 | ret = PTR_ERR(tps->regmap); |
| 156 | dev_err(tps->dev, "Failed to allocate register map: %d\n", |
| 157 | ret); |
| 158 | return ret; |
| 159 | } |
| 160 | |
| 161 | i2c_set_clientdata(client, tps); |
| 162 | tps->dev = &client->dev; |
| 163 | |
| 164 | ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version); |
| 165 | if (ret < 0) { |
Axel Lin | 0ef4619 | 2012-04-25 10:06:40 +0800 | [diff] [blame] | 166 | dev_err(tps->dev, "Failed to read revision register: %d\n", |
| 167 | ret); |
| 168 | return ret; |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 169 | } |
| 170 | |
| 171 | dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n", |
| 172 | (version & TPS65217_CHIPID_CHIP_MASK) >> 4, |
| 173 | version & TPS65217_CHIPID_REV_MASK); |
| 174 | |
| 175 | for (i = 0; i < TPS65217_NUM_REGULATOR; i++) { |
| 176 | struct platform_device *pdev; |
| 177 | |
| 178 | pdev = platform_device_alloc("tps65217-pmic", i); |
| 179 | if (!pdev) { |
| 180 | dev_err(tps->dev, "Cannot create regulator %d\n", i); |
| 181 | continue; |
| 182 | } |
| 183 | |
| 184 | pdev->dev.parent = tps->dev; |
| 185 | platform_device_add_data(pdev, &pdata->tps65217_init_data[i], |
| 186 | sizeof(pdata->tps65217_init_data[i])); |
| 187 | tps->regulator_pdev[i] = pdev; |
| 188 | |
| 189 | platform_device_add(pdev); |
| 190 | } |
| 191 | |
| 192 | return 0; |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 193 | } |
| 194 | |
| 195 | static int __devexit tps65217_remove(struct i2c_client *client) |
| 196 | { |
| 197 | struct tps65217 *tps = i2c_get_clientdata(client); |
| 198 | int i; |
| 199 | |
| 200 | for (i = 0; i < TPS65217_NUM_REGULATOR; i++) |
| 201 | platform_device_unregister(tps->regulator_pdev[i]); |
| 202 | |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 203 | return 0; |
| 204 | } |
| 205 | |
| 206 | static const struct i2c_device_id tps65217_id_table[] = { |
| 207 | {"tps65217", 0xF0}, |
| 208 | {/* end of list */} |
| 209 | }; |
| 210 | MODULE_DEVICE_TABLE(i2c, tps65217_id_table); |
| 211 | |
| 212 | static struct i2c_driver tps65217_driver = { |
| 213 | .driver = { |
| 214 | .name = "tps65217", |
| 215 | }, |
| 216 | .id_table = tps65217_id_table, |
| 217 | .probe = tps65217_probe, |
| 218 | .remove = __devexit_p(tps65217_remove), |
| 219 | }; |
| 220 | |
| 221 | static int __init tps65217_init(void) |
| 222 | { |
| 223 | return i2c_add_driver(&tps65217_driver); |
| 224 | } |
| 225 | subsys_initcall(tps65217_init); |
| 226 | |
| 227 | static void __exit tps65217_exit(void) |
| 228 | { |
| 229 | i2c_del_driver(&tps65217_driver); |
| 230 | } |
| 231 | module_exit(tps65217_exit); |
| 232 | |
| 233 | MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>"); |
| 234 | MODULE_DESCRIPTION("TPS65217 chip family multi-function driver"); |
| 235 | MODULE_LICENSE("GPL v2"); |