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> |
AnilKumar Ch | 817bb7f | 2012-08-13 20:36:05 +0530 | [diff] [blame] | 27 | #include <linux/of.h> |
| 28 | #include <linux/of_device.h> |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 29 | |
| 30 | #include <linux/mfd/core.h> |
| 31 | #include <linux/mfd/tps65217.h> |
| 32 | |
AnilKumar Ch | 817bb7f | 2012-08-13 20:36:05 +0530 | [diff] [blame] | 33 | static struct mfd_cell tps65217s[] = { |
| 34 | { |
| 35 | .name = "tps65217-pmic", |
| 36 | }, |
| 37 | }; |
| 38 | |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 39 | /** |
| 40 | * tps65217_reg_read: Read a single tps65217 register. |
| 41 | * |
| 42 | * @tps: Device to read from. |
| 43 | * @reg: Register to read. |
| 44 | * @val: Contians the value |
| 45 | */ |
| 46 | int tps65217_reg_read(struct tps65217 *tps, unsigned int reg, |
| 47 | unsigned int *val) |
| 48 | { |
| 49 | return regmap_read(tps->regmap, reg, val); |
| 50 | } |
| 51 | EXPORT_SYMBOL_GPL(tps65217_reg_read); |
| 52 | |
| 53 | /** |
| 54 | * tps65217_reg_write: Write a single tps65217 register. |
| 55 | * |
| 56 | * @tps65217: Device to write to. |
| 57 | * @reg: Register to write to. |
| 58 | * @val: Value to write. |
| 59 | * @level: Password protected level |
| 60 | */ |
| 61 | int tps65217_reg_write(struct tps65217 *tps, unsigned int reg, |
| 62 | unsigned int val, unsigned int level) |
| 63 | { |
| 64 | int ret; |
| 65 | unsigned int xor_reg_val; |
| 66 | |
| 67 | switch (level) { |
| 68 | case TPS65217_PROTECT_NONE: |
| 69 | return regmap_write(tps->regmap, reg, val); |
| 70 | case TPS65217_PROTECT_L1: |
| 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 | |
| 77 | return regmap_write(tps->regmap, reg, val); |
| 78 | case TPS65217_PROTECT_L2: |
| 79 | xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK; |
| 80 | ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD, |
| 81 | xor_reg_val); |
| 82 | if (ret < 0) |
| 83 | return ret; |
| 84 | ret = regmap_write(tps->regmap, reg, val); |
| 85 | if (ret < 0) |
| 86 | return ret; |
| 87 | ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD, |
| 88 | xor_reg_val); |
| 89 | if (ret < 0) |
| 90 | return ret; |
| 91 | return regmap_write(tps->regmap, reg, val); |
| 92 | default: |
| 93 | return -EINVAL; |
| 94 | } |
| 95 | } |
| 96 | EXPORT_SYMBOL_GPL(tps65217_reg_write); |
| 97 | |
| 98 | /** |
| 99 | * tps65217_update_bits: Modify bits w.r.t mask, val and level. |
| 100 | * |
| 101 | * @tps65217: Device to write to. |
| 102 | * @reg: Register to read-write to. |
| 103 | * @mask: Mask. |
| 104 | * @val: Value to write. |
| 105 | * @level: Password protected level |
| 106 | */ |
Mark Brown | 27757e8 | 2012-05-09 21:18:05 +0100 | [diff] [blame] | 107 | static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg, |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 108 | unsigned int mask, unsigned int val, unsigned int level) |
| 109 | { |
| 110 | int ret; |
| 111 | unsigned int data; |
| 112 | |
| 113 | ret = tps65217_reg_read(tps, reg, &data); |
| 114 | if (ret) { |
| 115 | dev_err(tps->dev, "Read from reg 0x%x failed\n", reg); |
| 116 | return ret; |
| 117 | } |
| 118 | |
| 119 | data &= ~mask; |
| 120 | data |= val & mask; |
| 121 | |
| 122 | ret = tps65217_reg_write(tps, reg, data, level); |
| 123 | if (ret) |
| 124 | dev_err(tps->dev, "Write for reg 0x%x failed\n", reg); |
| 125 | |
| 126 | return ret; |
| 127 | } |
| 128 | |
| 129 | int tps65217_set_bits(struct tps65217 *tps, unsigned int reg, |
| 130 | unsigned int mask, unsigned int val, unsigned int level) |
| 131 | { |
| 132 | return tps65217_update_bits(tps, reg, mask, val, level); |
| 133 | } |
| 134 | EXPORT_SYMBOL_GPL(tps65217_set_bits); |
| 135 | |
| 136 | int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg, |
| 137 | unsigned int mask, unsigned int level) |
| 138 | { |
| 139 | return tps65217_update_bits(tps, reg, mask, 0, level); |
| 140 | } |
| 141 | EXPORT_SYMBOL_GPL(tps65217_clear_bits); |
| 142 | |
| 143 | static struct regmap_config tps65217_regmap_config = { |
| 144 | .reg_bits = 8, |
| 145 | .val_bits = 8, |
| 146 | }; |
| 147 | |
AnilKumar Ch | 817bb7f | 2012-08-13 20:36:05 +0530 | [diff] [blame] | 148 | static const struct of_device_id tps65217_of_match[] = { |
| 149 | { .compatible = "ti,tps65217", .data = (void *)TPS65217 }, |
| 150 | { /* sentinel */ }, |
| 151 | }; |
| 152 | |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 153 | static int __devinit tps65217_probe(struct i2c_client *client, |
| 154 | const struct i2c_device_id *ids) |
| 155 | { |
| 156 | struct tps65217 *tps; |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 157 | unsigned int version; |
AnilKumar Ch | 817bb7f | 2012-08-13 20:36:05 +0530 | [diff] [blame] | 158 | unsigned int chip_id = ids->driver_data; |
| 159 | const struct of_device_id *match; |
| 160 | int ret; |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 161 | |
AnilKumar Ch | 817bb7f | 2012-08-13 20:36:05 +0530 | [diff] [blame] | 162 | if (client->dev.of_node) { |
| 163 | match = of_match_device(tps65217_of_match, &client->dev); |
| 164 | if (!match) { |
| 165 | dev_err(&client->dev, |
| 166 | "Failed to find matching dt id\n"); |
| 167 | return -EINVAL; |
| 168 | } |
| 169 | chip_id = (unsigned int)match->data; |
| 170 | } |
| 171 | |
| 172 | if (!chip_id) { |
| 173 | dev_err(&client->dev, "id is null.\n"); |
| 174 | return -ENODEV; |
| 175 | } |
AnilKumar Ch | a7f1b63 | 2012-07-10 16:39:42 +0530 | [diff] [blame] | 176 | |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 177 | tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); |
| 178 | if (!tps) |
| 179 | return -ENOMEM; |
| 180 | |
AnilKumar Ch | 817bb7f | 2012-08-13 20:36:05 +0530 | [diff] [blame] | 181 | i2c_set_clientdata(client, tps); |
| 182 | tps->dev = &client->dev; |
| 183 | tps->id = chip_id; |
| 184 | |
Axel Lin | 0ef4619 | 2012-04-25 10:06:40 +0800 | [diff] [blame] | 185 | tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config); |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 186 | if (IS_ERR(tps->regmap)) { |
| 187 | ret = PTR_ERR(tps->regmap); |
| 188 | dev_err(tps->dev, "Failed to allocate register map: %d\n", |
| 189 | ret); |
| 190 | return ret; |
| 191 | } |
| 192 | |
AnilKumar Ch | 817bb7f | 2012-08-13 20:36:05 +0530 | [diff] [blame] | 193 | ret = mfd_add_devices(tps->dev, -1, tps65217s, |
| 194 | ARRAY_SIZE(tps65217s), NULL, 0); |
| 195 | if (ret < 0) { |
| 196 | dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret); |
| 197 | return ret; |
| 198 | } |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 199 | |
| 200 | ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version); |
| 201 | if (ret < 0) { |
Axel Lin | 0ef4619 | 2012-04-25 10:06:40 +0800 | [diff] [blame] | 202 | dev_err(tps->dev, "Failed to read revision register: %d\n", |
| 203 | ret); |
| 204 | return ret; |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 205 | } |
| 206 | |
| 207 | dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n", |
| 208 | (version & TPS65217_CHIPID_CHIP_MASK) >> 4, |
| 209 | version & TPS65217_CHIPID_REV_MASK); |
| 210 | |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 211 | return 0; |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | static int __devexit tps65217_remove(struct i2c_client *client) |
| 215 | { |
| 216 | struct tps65217 *tps = i2c_get_clientdata(client); |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 217 | |
AnilKumar Ch | 817bb7f | 2012-08-13 20:36:05 +0530 | [diff] [blame] | 218 | mfd_remove_devices(tps->dev); |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 219 | |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 220 | return 0; |
| 221 | } |
| 222 | |
| 223 | static const struct i2c_device_id tps65217_id_table[] = { |
AnilKumar Ch | 817bb7f | 2012-08-13 20:36:05 +0530 | [diff] [blame] | 224 | {"tps65217", TPS65217}, |
| 225 | { /* sentinel */ } |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 226 | }; |
| 227 | MODULE_DEVICE_TABLE(i2c, tps65217_id_table); |
| 228 | |
| 229 | static struct i2c_driver tps65217_driver = { |
| 230 | .driver = { |
| 231 | .name = "tps65217", |
AnilKumar Ch | a7f1b63 | 2012-07-10 16:39:42 +0530 | [diff] [blame] | 232 | .owner = THIS_MODULE, |
| 233 | .of_match_table = of_match_ptr(tps65217_of_match), |
AnilKumar Ch | d48f411 | 2012-01-11 16:11:41 +0530 | [diff] [blame] | 234 | }, |
| 235 | .id_table = tps65217_id_table, |
| 236 | .probe = tps65217_probe, |
| 237 | .remove = __devexit_p(tps65217_remove), |
| 238 | }; |
| 239 | |
| 240 | static int __init tps65217_init(void) |
| 241 | { |
| 242 | return i2c_add_driver(&tps65217_driver); |
| 243 | } |
| 244 | subsys_initcall(tps65217_init); |
| 245 | |
| 246 | static void __exit tps65217_exit(void) |
| 247 | { |
| 248 | i2c_del_driver(&tps65217_driver); |
| 249 | } |
| 250 | module_exit(tps65217_exit); |
| 251 | |
| 252 | MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>"); |
| 253 | MODULE_DESCRIPTION("TPS65217 chip family multi-function driver"); |
| 254 | MODULE_LICENSE("GPL v2"); |