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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>
AnilKumar Ch817bb7f2012-08-13 20:36:05 +053027#include <linux/of.h>
28#include <linux/of_device.h>
AnilKumar Chd48f4112012-01-11 16:11:41 +053029
30#include <linux/mfd/core.h>
31#include <linux/mfd/tps65217.h>
32
AnilKumar Ch817bb7f2012-08-13 20:36:05 +053033static struct mfd_cell tps65217s[] = {
34 {
35 .name = "tps65217-pmic",
36 },
Matthias Kaehlckeb6290ff2012-09-24 22:25:34 +020037 {
38 .name = "tps65217-bl",
39 },
AnilKumar Ch817bb7f2012-08-13 20:36:05 +053040};
41
AnilKumar Chd48f4112012-01-11 16:11:41 +053042/**
43 * tps65217_reg_read: Read a single tps65217 register.
44 *
45 * @tps: Device to read from.
46 * @reg: Register to read.
47 * @val: Contians the value
48 */
49int tps65217_reg_read(struct tps65217 *tps, unsigned int reg,
50 unsigned int *val)
51{
52 return regmap_read(tps->regmap, reg, val);
53}
54EXPORT_SYMBOL_GPL(tps65217_reg_read);
55
56/**
57 * tps65217_reg_write: Write a single tps65217 register.
58 *
59 * @tps65217: Device to write to.
60 * @reg: Register to write to.
61 * @val: Value to write.
62 * @level: Password protected level
63 */
64int tps65217_reg_write(struct tps65217 *tps, unsigned int reg,
65 unsigned int val, unsigned int level)
66{
67 int ret;
68 unsigned int xor_reg_val;
69
70 switch (level) {
71 case TPS65217_PROTECT_NONE:
72 return regmap_write(tps->regmap, reg, val);
73 case TPS65217_PROTECT_L1:
74 xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
75 ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
76 xor_reg_val);
77 if (ret < 0)
78 return ret;
79
80 return regmap_write(tps->regmap, reg, val);
81 case TPS65217_PROTECT_L2:
82 xor_reg_val = reg ^ TPS65217_PASSWORD_REGS_UNLOCK;
83 ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
84 xor_reg_val);
85 if (ret < 0)
86 return ret;
87 ret = regmap_write(tps->regmap, reg, val);
88 if (ret < 0)
89 return ret;
90 ret = regmap_write(tps->regmap, TPS65217_REG_PASSWORD,
91 xor_reg_val);
92 if (ret < 0)
93 return ret;
94 return regmap_write(tps->regmap, reg, val);
95 default:
96 return -EINVAL;
97 }
98}
99EXPORT_SYMBOL_GPL(tps65217_reg_write);
100
101/**
102 * tps65217_update_bits: Modify bits w.r.t mask, val and level.
103 *
104 * @tps65217: Device to write to.
105 * @reg: Register to read-write to.
106 * @mask: Mask.
107 * @val: Value to write.
108 * @level: Password protected level
109 */
Mark Brown27757e82012-05-09 21:18:05 +0100110static int tps65217_update_bits(struct tps65217 *tps, unsigned int reg,
AnilKumar Chd48f4112012-01-11 16:11:41 +0530111 unsigned int mask, unsigned int val, unsigned int level)
112{
113 int ret;
114 unsigned int data;
115
116 ret = tps65217_reg_read(tps, reg, &data);
117 if (ret) {
118 dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
119 return ret;
120 }
121
122 data &= ~mask;
123 data |= val & mask;
124
125 ret = tps65217_reg_write(tps, reg, data, level);
126 if (ret)
127 dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
128
129 return ret;
130}
131
132int tps65217_set_bits(struct tps65217 *tps, unsigned int reg,
133 unsigned int mask, unsigned int val, unsigned int level)
134{
135 return tps65217_update_bits(tps, reg, mask, val, level);
136}
137EXPORT_SYMBOL_GPL(tps65217_set_bits);
138
139int tps65217_clear_bits(struct tps65217 *tps, unsigned int reg,
140 unsigned int mask, unsigned int level)
141{
142 return tps65217_update_bits(tps, reg, mask, 0, level);
143}
144EXPORT_SYMBOL_GPL(tps65217_clear_bits);
145
146static struct regmap_config tps65217_regmap_config = {
147 .reg_bits = 8,
148 .val_bits = 8,
149};
150
AnilKumar Ch817bb7f2012-08-13 20:36:05 +0530151static const struct of_device_id tps65217_of_match[] = {
152 { .compatible = "ti,tps65217", .data = (void *)TPS65217 },
153 { /* sentinel */ },
154};
155
Bill Pembertonf791be42012-11-19 13:23:04 -0500156static int tps65217_probe(struct i2c_client *client,
AnilKumar Chd48f4112012-01-11 16:11:41 +0530157 const struct i2c_device_id *ids)
158{
159 struct tps65217 *tps;
AnilKumar Chd48f4112012-01-11 16:11:41 +0530160 unsigned int version;
AnilKumar Ch817bb7f2012-08-13 20:36:05 +0530161 unsigned int chip_id = ids->driver_data;
162 const struct of_device_id *match;
Colin Foe-Parkereb433da2012-11-20 15:18:44 +0530163 bool status_off = false;
AnilKumar Ch817bb7f2012-08-13 20:36:05 +0530164 int ret;
AnilKumar Chd48f4112012-01-11 16:11:41 +0530165
AnilKumar Ch817bb7f2012-08-13 20:36:05 +0530166 if (client->dev.of_node) {
167 match = of_match_device(tps65217_of_match, &client->dev);
168 if (!match) {
169 dev_err(&client->dev,
170 "Failed to find matching dt id\n");
171 return -EINVAL;
172 }
173 chip_id = (unsigned int)match->data;
Colin Foe-Parkereb433da2012-11-20 15:18:44 +0530174 status_off = of_property_read_bool(client->dev.of_node,
175 "ti,pmic-shutdown-controller");
AnilKumar Ch817bb7f2012-08-13 20:36:05 +0530176 }
177
178 if (!chip_id) {
179 dev_err(&client->dev, "id is null.\n");
180 return -ENODEV;
181 }
AnilKumar Cha7f1b632012-07-10 16:39:42 +0530182
AnilKumar Chd48f4112012-01-11 16:11:41 +0530183 tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
184 if (!tps)
185 return -ENOMEM;
186
AnilKumar Ch817bb7f2012-08-13 20:36:05 +0530187 i2c_set_clientdata(client, tps);
188 tps->dev = &client->dev;
189 tps->id = chip_id;
190
Axel Lin0ef46192012-04-25 10:06:40 +0800191 tps->regmap = devm_regmap_init_i2c(client, &tps65217_regmap_config);
AnilKumar Chd48f4112012-01-11 16:11:41 +0530192 if (IS_ERR(tps->regmap)) {
193 ret = PTR_ERR(tps->regmap);
194 dev_err(tps->dev, "Failed to allocate register map: %d\n",
195 ret);
196 return ret;
197 }
198
AnilKumar Ch817bb7f2012-08-13 20:36:05 +0530199 ret = mfd_add_devices(tps->dev, -1, tps65217s,
Mark Brown55692af2012-09-11 15:16:36 +0800200 ARRAY_SIZE(tps65217s), NULL, 0, NULL);
AnilKumar Ch817bb7f2012-08-13 20:36:05 +0530201 if (ret < 0) {
202 dev_err(tps->dev, "mfd_add_devices failed: %d\n", ret);
203 return ret;
204 }
AnilKumar Chd48f4112012-01-11 16:11:41 +0530205
206 ret = tps65217_reg_read(tps, TPS65217_REG_CHIPID, &version);
207 if (ret < 0) {
Axel Lin0ef46192012-04-25 10:06:40 +0800208 dev_err(tps->dev, "Failed to read revision register: %d\n",
209 ret);
210 return ret;
AnilKumar Chd48f4112012-01-11 16:11:41 +0530211 }
212
Colin Foe-Parkereb433da2012-11-20 15:18:44 +0530213 /* Set the PMIC to shutdown on PWR_EN toggle */
214 if (status_off) {
215 ret = tps65217_set_bits(tps, TPS65217_REG_STATUS,
216 TPS65217_STATUS_OFF, TPS65217_STATUS_OFF,
217 TPS65217_PROTECT_NONE);
218 if (ret)
219 dev_warn(tps->dev, "unable to set the status OFF\n");
220 }
221
AnilKumar Chd48f4112012-01-11 16:11:41 +0530222 dev_info(tps->dev, "TPS65217 ID %#x version 1.%d\n",
223 (version & TPS65217_CHIPID_CHIP_MASK) >> 4,
224 version & TPS65217_CHIPID_REV_MASK);
225
AnilKumar Chd48f4112012-01-11 16:11:41 +0530226 return 0;
AnilKumar Chd48f4112012-01-11 16:11:41 +0530227}
228
Bill Pemberton4740f732012-11-19 13:26:01 -0500229static int tps65217_remove(struct i2c_client *client)
AnilKumar Chd48f4112012-01-11 16:11:41 +0530230{
231 struct tps65217 *tps = i2c_get_clientdata(client);
AnilKumar Chd48f4112012-01-11 16:11:41 +0530232
AnilKumar Ch817bb7f2012-08-13 20:36:05 +0530233 mfd_remove_devices(tps->dev);
AnilKumar Chd48f4112012-01-11 16:11:41 +0530234
AnilKumar Chd48f4112012-01-11 16:11:41 +0530235 return 0;
236}
237
238static const struct i2c_device_id tps65217_id_table[] = {
AnilKumar Ch817bb7f2012-08-13 20:36:05 +0530239 {"tps65217", TPS65217},
240 { /* sentinel */ }
AnilKumar Chd48f4112012-01-11 16:11:41 +0530241};
242MODULE_DEVICE_TABLE(i2c, tps65217_id_table);
243
244static struct i2c_driver tps65217_driver = {
245 .driver = {
246 .name = "tps65217",
AnilKumar Cha7f1b632012-07-10 16:39:42 +0530247 .owner = THIS_MODULE,
248 .of_match_table = of_match_ptr(tps65217_of_match),
AnilKumar Chd48f4112012-01-11 16:11:41 +0530249 },
250 .id_table = tps65217_id_table,
251 .probe = tps65217_probe,
Bill Pemberton84449212012-11-19 13:20:24 -0500252 .remove = tps65217_remove,
AnilKumar Chd48f4112012-01-11 16:11:41 +0530253};
254
255static int __init tps65217_init(void)
256{
257 return i2c_add_driver(&tps65217_driver);
258}
259subsys_initcall(tps65217_init);
260
261static void __exit tps65217_exit(void)
262{
263 i2c_del_driver(&tps65217_driver);
264}
265module_exit(tps65217_exit);
266
267MODULE_AUTHOR("AnilKumar Ch <anilkumar@ti.com>");
268MODULE_DESCRIPTION("TPS65217 chip family multi-function driver");
269MODULE_LICENSE("GPL v2");