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AnilKumar Chd48f4112012-01-11 16:11:41 +05301/*
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 */
38int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
39 unsigned int *val)
40{
41 return regmap_read(tps->regmap, reg, val);
42}
43EXPORT_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 */
53int 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}
88EXPORT_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 */
99int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
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
121int 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}
126EXPORT_SYMBOL_GPL(tps65217_set_bits);
127
128int 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}
133EXPORT_SYMBOL_GPL(tps65217_clear_bits);
134
135static struct regmap_config tps65217_regmap_config = {
136 .reg_bits = 8,
137 .val_bits = 8,
138};
139
140static 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 Lin0ef46192012-04-25 10:06:40 +0800153 tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
AnilKumar Chd48f4112012-01-11 16:11:41 +0530154 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 Lin0ef46192012-04-25 10:06:40 +0800166 dev_err(tps->dev, "Failed to read revision register: %d\n",
167 ret);
168 return ret;
AnilKumar Chd48f4112012-01-11 16:11:41 +0530169 }
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 Chd48f4112012-01-11 16:11:41 +0530193}
194
195static 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 Chd48f4112012-01-11 16:11:41 +0530203 return 0;
204}
205
206static const struct i2c_device_id tps65217_id_table[] = {
207 {"tps65217", 0xF0},
208 {/* end of list */}
209};
210MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
211
212static 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
221static int __init tps65217_init(void)
222{
223 return i2c_add_driver(&tps65217_driver);
224}
225subsys_initcall(tps65217_init);
226
227static void __exit tps65217_exit(void)
228{
229 i2c_del_driver(&tps65217_driver);
230}
231module_exit(tps65217_exit);
232
233MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
234MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
235MODULE_LICENSE("GPL v2");