1/*
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 const struct regmap_range tps65218_yes_ranges[] = {
129	regmap_reg_range(TPS65218_REG_INT1, TPS65218_REG_INT2),
130	regmap_reg_range(TPS65218_REG_STATUS, TPS65218_REG_STATUS),
131};
132
133static const struct regmap_access_table tps65218_volatile_table = {
134	.yes_ranges = tps65218_yes_ranges,
135	.n_yes_ranges = ARRAY_SIZE(tps65218_yes_ranges),
136};
137
138static const struct regmap_config tps65218_regmap_config = {
139	.reg_bits = 8,
140	.val_bits = 8,
141	.cache_type = REGCACHE_RBTREE,
142	.volatile_table = &tps65218_volatile_table,
143};
144
145static const struct regmap_irq tps65218_irqs[] = {
146	/* INT1 IRQs */
147	[TPS65218_PRGC_IRQ] = {
148		.mask = TPS65218_INT1_PRGC,
149	},
150	[TPS65218_CC_AQC_IRQ] = {
151		.mask = TPS65218_INT1_CC_AQC,
152	},
153	[TPS65218_HOT_IRQ] = {
154		.mask = TPS65218_INT1_HOT,
155	},
156	[TPS65218_PB_IRQ] = {
157		.mask = TPS65218_INT1_PB,
158	},
159	[TPS65218_AC_IRQ] = {
160		.mask = TPS65218_INT1_AC,
161	},
162	[TPS65218_VPRG_IRQ] = {
163		.mask = TPS65218_INT1_VPRG,
164	},
165	[TPS65218_INVALID1_IRQ] = {
166	},
167	[TPS65218_INVALID2_IRQ] = {
168	},
169	/* INT2 IRQs*/
170	[TPS65218_LS1_I_IRQ] = {
171		.mask = TPS65218_INT2_LS1_I,
172		.reg_offset = 1,
173	},
174	[TPS65218_LS2_I_IRQ] = {
175		.mask = TPS65218_INT2_LS2_I,
176		.reg_offset = 1,
177	},
178	[TPS65218_LS3_I_IRQ] = {
179		.mask = TPS65218_INT2_LS3_I,
180		.reg_offset = 1,
181	},
182	[TPS65218_LS1_F_IRQ] = {
183		.mask = TPS65218_INT2_LS1_F,
184		.reg_offset = 1,
185	},
186	[TPS65218_LS2_F_IRQ] = {
187		.mask = TPS65218_INT2_LS2_F,
188		.reg_offset = 1,
189	},
190	[TPS65218_LS3_F_IRQ] = {
191		.mask = TPS65218_INT2_LS3_F,
192		.reg_offset = 1,
193	},
194	[TPS65218_INVALID3_IRQ] = {
195	},
196	[TPS65218_INVALID4_IRQ] = {
197	},
198};
199
200static struct regmap_irq_chip tps65218_irq_chip = {
201	.name = "tps65218",
202	.irqs = tps65218_irqs,
203	.num_irqs = ARRAY_SIZE(tps65218_irqs),
204
205	.num_regs = 2,
206	.mask_base = TPS65218_REG_INT_MASK1,
207	.status_base = TPS65218_REG_INT1,
208};
209
210static const struct of_device_id of_tps65218_match_table[] = {
211	{ .compatible = "ti,tps65218", },
212	{}
213};
214MODULE_DEVICE_TABLE(of, of_tps65218_match_table);
215
216static int tps65218_probe(struct i2c_client *client,
217				const struct i2c_device_id *ids)
218{
219	struct tps65218 *tps;
220	const struct of_device_id *match;
221	int ret;
222
223	match = of_match_device(of_tps65218_match_table, &client->dev);
224	if (!match) {
225		dev_err(&client->dev,
226			"Failed to find matching dt id\n");
227		return -EINVAL;
228	}
229
230	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
231	if (!tps)
232		return -ENOMEM;
233
234	i2c_set_clientdata(client, tps);
235	tps->dev = &client->dev;
236	tps->irq = client->irq;
237	tps->regmap = devm_regmap_init_i2c(client, &tps65218_regmap_config);
238	if (IS_ERR(tps->regmap)) {
239		ret = PTR_ERR(tps->regmap);
240		dev_err(tps->dev, "Failed to allocate register map: %d\n",
241			ret);
242		return ret;
243	}
244
245	mutex_init(&tps->tps_lock);
246
247	ret = regmap_add_irq_chip(tps->regmap, tps->irq,
248			IRQF_ONESHOT, 0, &tps65218_irq_chip,
249			&tps->irq_data);
250	if (ret < 0)
251		return ret;
252
253	ret = of_platform_populate(client->dev.of_node, NULL, NULL,
254				   &client->dev);
255	if (ret < 0)
256		goto err_irq;
257
258	return 0;
259
260err_irq:
261	regmap_del_irq_chip(tps->irq, tps->irq_data);
262
263	return ret;
264}
265
266static int tps65218_remove(struct i2c_client *client)
267{
268	struct tps65218 *tps = i2c_get_clientdata(client);
269
270	regmap_del_irq_chip(tps->irq, tps->irq_data);
271
272	return 0;
273}
274
275static const struct i2c_device_id tps65218_id_table[] = {
276	{ "tps65218", TPS65218 },
277	{ },
278};
279MODULE_DEVICE_TABLE(i2c, tps65218_id_table);
280
281static struct i2c_driver tps65218_driver = {
282	.driver		= {
283		.name	= "tps65218",
284		.of_match_table = of_tps65218_match_table,
285	},
286	.probe		= tps65218_probe,
287	.remove		= tps65218_remove,
288	.id_table       = tps65218_id_table,
289};
290
291module_i2c_driver(tps65218_driver);
292
293MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
294MODULE_DESCRIPTION("TPS65218 chip family multi-function driver");
295MODULE_LICENSE("GPL v2");
296