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Keerthy44b4dc62014-02-06 11:20:12 +05301/*
2 * Driver for TPS65218 Integrated power management chipsets
3 *
4 * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
11 * kind, whether expressed or implied; without even the implied warranty
12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License version 2 for more details.
14 */
15
16#include <linux/kernel.h>
17#include <linux/device.h>
18#include <linux/module.h>
19#include <linux/platform_device.h>
20#include <linux/init.h>
21#include <linux/i2c.h>
22#include <linux/slab.h>
23#include <linux/regmap.h>
24#include <linux/err.h>
25#include <linux/of.h>
26#include <linux/of_device.h>
27#include <linux/irq.h>
28#include <linux/interrupt.h>
29#include <linux/mutex.h>
30
31#include <linux/mfd/core.h>
32#include <linux/mfd/tps65218.h>
33
34#define TPS65218_PASSWORD_REGS_UNLOCK 0x7D
35
36/**
37 * tps65218_reg_read: Read a single tps65218 register.
38 *
39 * @tps: Device to read from.
40 * @reg: Register to read.
41 * @val: Contians the value
42 */
43int tps65218_reg_read(struct tps65218 *tps, unsigned int reg,
44 unsigned int *val)
45{
46 return regmap_read(tps->regmap, reg, val);
47}
48EXPORT_SYMBOL_GPL(tps65218_reg_read);
49
50/**
51 * tps65218_reg_write: Write a single tps65218 register.
52 *
53 * @tps65218: Device to write to.
54 * @reg: Register to write to.
55 * @val: Value to write.
56 * @level: Password protected level
57 */
58int tps65218_reg_write(struct tps65218 *tps, unsigned int reg,
59 unsigned int val, unsigned int level)
60{
61 int ret;
62 unsigned int xor_reg_val;
63
64 switch (level) {
65 case TPS65218_PROTECT_NONE:
66 return regmap_write(tps->regmap, reg, val);
67 case TPS65218_PROTECT_L1:
68 xor_reg_val = reg ^ TPS65218_PASSWORD_REGS_UNLOCK;
69 ret = regmap_write(tps->regmap, TPS65218_REG_PASSWORD,
70 xor_reg_val);
71 if (ret < 0)
72 return ret;
73
74 return regmap_write(tps->regmap, reg, val);
75 default:
76 return -EINVAL;
77 }
78}
79EXPORT_SYMBOL_GPL(tps65218_reg_write);
80
81/**
82 * tps65218_update_bits: Modify bits w.r.t mask, val and level.
83 *
84 * @tps65218: Device to write to.
85 * @reg: Register to read-write to.
86 * @mask: Mask.
87 * @val: Value to write.
88 * @level: Password protected level
89 */
90static int tps65218_update_bits(struct tps65218 *tps, unsigned int reg,
91 unsigned int mask, unsigned int val, unsigned int level)
92{
93 int ret;
94 unsigned int data;
95
96 ret = tps65218_reg_read(tps, reg, &data);
97 if (ret) {
98 dev_err(tps->dev, "Read from reg 0x%x failed\n", reg);
99 return ret;
100 }
101
102 data &= ~mask;
103 data |= val & mask;
104
105 mutex_lock(&tps->tps_lock);
106 ret = tps65218_reg_write(tps, reg, data, level);
107 if (ret)
108 dev_err(tps->dev, "Write for reg 0x%x failed\n", reg);
109 mutex_unlock(&tps->tps_lock);
110
111 return ret;
112}
113
114int tps65218_set_bits(struct tps65218 *tps, unsigned int reg,
115 unsigned int mask, unsigned int val, unsigned int level)
116{
117 return tps65218_update_bits(tps, reg, mask, val, level);
118}
119EXPORT_SYMBOL_GPL(tps65218_set_bits);
120
121int tps65218_clear_bits(struct tps65218 *tps, unsigned int reg,
122 unsigned int mask, unsigned int level)
123{
124 return tps65218_update_bits(tps, reg, mask, 0, level);
125}
126EXPORT_SYMBOL_GPL(tps65218_clear_bits);
127
128static struct regmap_config tps65218_regmap_config = {
129 .reg_bits = 8,
130 .val_bits = 8,
131 .cache_type = REGCACHE_RBTREE,
132};
133
134static const struct regmap_irq tps65218_irqs[] = {
135 /* INT1 IRQs */
136 [TPS65218_PRGC_IRQ] = {
137 .mask = TPS65218_INT1_PRGC,
138 },
139 [TPS65218_CC_AQC_IRQ] = {
140 .mask = TPS65218_INT1_CC_AQC,
141 },
142 [TPS65218_HOT_IRQ] = {
143 .mask = TPS65218_INT1_HOT,
144 },
145 [TPS65218_PB_IRQ] = {
146 .mask = TPS65218_INT1_PB,
147 },
148 [TPS65218_AC_IRQ] = {
149 .mask = TPS65218_INT1_AC,
150 },
151 [TPS65218_VPRG_IRQ] = {
152 .mask = TPS65218_INT1_VPRG,
153 },
154 [TPS65218_INVALID1_IRQ] = {
155 },
156 [TPS65218_INVALID2_IRQ] = {
157 },
158 /* INT2 IRQs*/
159 [TPS65218_LS1_I_IRQ] = {
160 .mask = TPS65218_INT2_LS1_I,
161 .reg_offset = 1,
162 },
163 [TPS65218_LS2_I_IRQ] = {
164 .mask = TPS65218_INT2_LS2_I,
165 .reg_offset = 1,
166 },
167 [TPS65218_LS3_I_IRQ] = {
168 .mask = TPS65218_INT2_LS3_I,
169 .reg_offset = 1,
170 },
171 [TPS65218_LS1_F_IRQ] = {
172 .mask = TPS65218_INT2_LS1_F,
173 .reg_offset = 1,
174 },
175 [TPS65218_LS2_F_IRQ] = {
176 .mask = TPS65218_INT2_LS2_F,
177 .reg_offset = 1,
178 },
179 [TPS65218_LS3_F_IRQ] = {
180 .mask = TPS65218_INT2_LS3_F,
181 .reg_offset = 1,
182 },
183 [TPS65218_INVALID3_IRQ] = {
184 },
185 [TPS65218_INVALID4_IRQ] = {
186 },
187};
188
189static struct regmap_irq_chip tps65218_irq_chip = {
190 .name = "tps65218",
191 .irqs = tps65218_irqs,
192 .num_irqs = ARRAY_SIZE(tps65218_irqs),
193
194 .num_regs = 2,
195 .mask_base = TPS65218_REG_INT_MASK1,
196};
197
198static const struct of_device_id of_tps65218_match_table[] = {
199 { .compatible = "ti,tps65218", },
Stephen Boyd83205132014-05-23 17:16:52 -0700200 {}
Keerthy44b4dc62014-02-06 11:20:12 +0530201};
202
203static int tps65218_probe(struct i2c_client *client,
204 const struct i2c_device_id *ids)
205{
206 struct tps65218 *tps;
207 const struct of_device_id *match;
208 int ret;
209
210 match = of_match_device(of_tps65218_match_table, &client->dev);
211 if (!match) {
212 dev_err(&client->dev,
213 "Failed to find matching dt id\n");
214 return -EINVAL;
215 }
216
217 tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
218 if (!tps)
219 return -ENOMEM;
220
221 i2c_set_clientdata(client, tps);
222 tps->dev = &client->dev;
223 tps->irq = client->irq;
224 tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config);
225 if (IS_ERR(tps->regmap)) {
226 ret = PTR_ERR(tps->regmap);
227 dev_err(tps->dev, "Failed to allocate register map: %d\n",
228 ret);
229 return ret;
230 }
231
232 mutex_init(&tps->tps_lock);
233
234 ret = regmap_add_irq_chip(tps->regmap, tps->irq,
235 IRQF_ONESHOT, 0, &tps65218_irq_chip,
236 &tps->irq_data);
237 if (ret < 0)
238 return ret;
239
240 ret = of_platform_populate(client->dev.of_node, NULL, NULL,
241 &client->dev);
242 if (ret < 0)
243 goto err_irq;
244
245 return 0;
246
247err_irq:
248 regmap_del_irq_chip(tps->irq, tps->irq_data);
249
250 return ret;
251}
252
253static int tps65218_remove(struct i2c_client *client)
254{
255 struct tps65218 *tps = i2c_get_clientdata(client);
256
257 regmap_del_irq_chip(tps->irq, tps->irq_data);
258
259 return 0;
260}
261
262static const struct i2c_device_id tps65218_id_table[] = {
263 { "tps65218", TPS65218 },
264 { },
265};
266MODULE_DEVICE_TABLE(i2c, tps65218_id_table);
267
268static struct i2c_driver tps65218_driver = {
269 .driver = {
270 .name = "tps65218",
271 .owner = THIS_MODULE,
272 .of_match_table = of_tps65218_match_table,
273 },
274 .probe = tps65218_probe,
275 .remove = tps65218_remove,
276 .id_table = tps65218_id_table,
277};
278
279module_i2c_driver(tps65218_driver);
280
281MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
282MODULE_DESCRIPTION("TPS65218 chip family multi-function driver");
283MODULE_LICENSE("GPL v2");