1/*
2 * Core driver for TI TPS65090 PMIC family
3 *
4 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
5
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13 * more details.
14
15 * You should have received a copy of the GNU General Public License
16 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
17 */
18
19#include <linux/interrupt.h>
20#include <linux/irq.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/mutex.h>
24#include <linux/slab.h>
25#include <linux/i2c.h>
26#include <linux/mfd/core.h>
27#include <linux/mfd/tps65090.h>
28#include <linux/of.h>
29#include <linux/of_device.h>
30#include <linux/err.h>
31
32#define NUM_INT_REG 2
33#define TOTAL_NUM_REG 0x18
34
35#define TPS65090_INT1_MASK_VAC_STATUS_CHANGE		1
36#define TPS65090_INT1_MASK_VSYS_STATUS_CHANGE		2
37#define TPS65090_INT1_MASK_BAT_STATUS_CHANGE		3
38#define TPS65090_INT1_MASK_CHARGING_STATUS_CHANGE	4
39#define TPS65090_INT1_MASK_CHARGING_COMPLETE		5
40#define TPS65090_INT1_MASK_OVERLOAD_DCDC1		6
41#define TPS65090_INT1_MASK_OVERLOAD_DCDC2		7
42#define TPS65090_INT2_MASK_OVERLOAD_DCDC3		0
43#define TPS65090_INT2_MASK_OVERLOAD_FET1		1
44#define TPS65090_INT2_MASK_OVERLOAD_FET2		2
45#define TPS65090_INT2_MASK_OVERLOAD_FET3		3
46#define TPS65090_INT2_MASK_OVERLOAD_FET4		4
47#define TPS65090_INT2_MASK_OVERLOAD_FET5		5
48#define TPS65090_INT2_MASK_OVERLOAD_FET6		6
49#define TPS65090_INT2_MASK_OVERLOAD_FET7		7
50
51static struct resource charger_resources[] = {
52	{
53		.start  = TPS65090_IRQ_VAC_STATUS_CHANGE,
54		.end    = TPS65090_IRQ_VAC_STATUS_CHANGE,
55		.flags  = IORESOURCE_IRQ,
56	}
57};
58
59enum tps65090_cells {
60	PMIC = 0,
61	CHARGER = 1,
62};
63
64static struct mfd_cell tps65090s[] = {
65	[PMIC] = {
66		.name = "tps65090-pmic",
67	},
68	[CHARGER] = {
69		.name = "tps65090-charger",
70		.num_resources = ARRAY_SIZE(charger_resources),
71		.resources = &charger_resources[0],
72		.of_compatible = "ti,tps65090-charger",
73	},
74};
75
76static const struct regmap_irq tps65090_irqs[] = {
77	/* INT1 IRQs*/
78	[TPS65090_IRQ_VAC_STATUS_CHANGE] = {
79			.mask = TPS65090_INT1_MASK_VAC_STATUS_CHANGE,
80	},
81	[TPS65090_IRQ_VSYS_STATUS_CHANGE] = {
82			.mask = TPS65090_INT1_MASK_VSYS_STATUS_CHANGE,
83	},
84	[TPS65090_IRQ_BAT_STATUS_CHANGE] = {
85			.mask = TPS65090_INT1_MASK_BAT_STATUS_CHANGE,
86	},
87	[TPS65090_IRQ_CHARGING_STATUS_CHANGE] = {
88			.mask = TPS65090_INT1_MASK_CHARGING_STATUS_CHANGE,
89	},
90	[TPS65090_IRQ_CHARGING_COMPLETE] = {
91			.mask = TPS65090_INT1_MASK_CHARGING_COMPLETE,
92	},
93	[TPS65090_IRQ_OVERLOAD_DCDC1] = {
94			.mask = TPS65090_INT1_MASK_OVERLOAD_DCDC1,
95	},
96	[TPS65090_IRQ_OVERLOAD_DCDC2] = {
97			.mask = TPS65090_INT1_MASK_OVERLOAD_DCDC2,
98	},
99	/* INT2 IRQs*/
100	[TPS65090_IRQ_OVERLOAD_DCDC3] = {
101			.reg_offset = 1,
102			.mask = TPS65090_INT2_MASK_OVERLOAD_DCDC3,
103	},
104	[TPS65090_IRQ_OVERLOAD_FET1] = {
105			.reg_offset = 1,
106			.mask = TPS65090_INT2_MASK_OVERLOAD_FET1,
107	},
108	[TPS65090_IRQ_OVERLOAD_FET2] = {
109			.reg_offset = 1,
110			.mask = TPS65090_INT2_MASK_OVERLOAD_FET2,
111	},
112	[TPS65090_IRQ_OVERLOAD_FET3] = {
113			.reg_offset = 1,
114			.mask = TPS65090_INT2_MASK_OVERLOAD_FET3,
115	},
116	[TPS65090_IRQ_OVERLOAD_FET4] = {
117			.reg_offset = 1,
118			.mask = TPS65090_INT2_MASK_OVERLOAD_FET4,
119	},
120	[TPS65090_IRQ_OVERLOAD_FET5] = {
121			.reg_offset = 1,
122			.mask = TPS65090_INT2_MASK_OVERLOAD_FET5,
123	},
124	[TPS65090_IRQ_OVERLOAD_FET6] = {
125			.reg_offset = 1,
126			.mask = TPS65090_INT2_MASK_OVERLOAD_FET6,
127	},
128	[TPS65090_IRQ_OVERLOAD_FET7] = {
129			.reg_offset = 1,
130			.mask = TPS65090_INT2_MASK_OVERLOAD_FET7,
131	},
132};
133
134static struct regmap_irq_chip tps65090_irq_chip = {
135	.name = "tps65090",
136	.irqs = tps65090_irqs,
137	.num_irqs = ARRAY_SIZE(tps65090_irqs),
138	.num_regs = NUM_INT_REG,
139	.status_base = TPS65090_REG_INTR_STS,
140	.mask_base = TPS65090_REG_INTR_MASK,
141	.mask_invert = true,
142};
143
144static bool is_volatile_reg(struct device *dev, unsigned int reg)
145{
146	/* Nearly all registers have status bits mixed in, except a few */
147	switch (reg) {
148	case TPS65090_REG_INTR_MASK:
149	case TPS65090_REG_INTR_MASK2:
150	case TPS65090_REG_CG_CTRL0:
151	case TPS65090_REG_CG_CTRL1:
152	case TPS65090_REG_CG_CTRL2:
153	case TPS65090_REG_CG_CTRL3:
154	case TPS65090_REG_CG_CTRL4:
155	case TPS65090_REG_CG_CTRL5:
156		return false;
157	}
158	return true;
159}
160
161static const struct regmap_config tps65090_regmap_config = {
162	.reg_bits = 8,
163	.val_bits = 8,
164	.max_register = TOTAL_NUM_REG,
165	.num_reg_defaults_raw = TOTAL_NUM_REG,
166	.cache_type = REGCACHE_RBTREE,
167	.volatile_reg = is_volatile_reg,
168};
169
170#ifdef CONFIG_OF
171static const struct of_device_id tps65090_of_match[] = {
172	{ .compatible = "ti,tps65090",},
173	{},
174};
175MODULE_DEVICE_TABLE(of, tps65090_of_match);
176#endif
177
178static int tps65090_i2c_probe(struct i2c_client *client,
179					const struct i2c_device_id *id)
180{
181	struct tps65090_platform_data *pdata = dev_get_platdata(&client->dev);
182	int irq_base = 0;
183	struct tps65090 *tps65090;
184	int ret;
185
186	if (!pdata && !client->dev.of_node) {
187		dev_err(&client->dev,
188			"tps65090 requires platform data or of_node\n");
189		return -EINVAL;
190	}
191
192	if (pdata)
193		irq_base = pdata->irq_base;
194
195	tps65090 = devm_kzalloc(&client->dev, sizeof(*tps65090), GFP_KERNEL);
196	if (!tps65090) {
197		dev_err(&client->dev, "mem alloc for tps65090 failed\n");
198		return -ENOMEM;
199	}
200
201	tps65090->dev = &client->dev;
202	i2c_set_clientdata(client, tps65090);
203
204	tps65090->rmap = devm_regmap_init_i2c(client, &tps65090_regmap_config);
205	if (IS_ERR(tps65090->rmap)) {
206		ret = PTR_ERR(tps65090->rmap);
207		dev_err(&client->dev, "regmap_init failed with err: %d\n", ret);
208		return ret;
209	}
210
211	if (client->irq) {
212		ret = regmap_add_irq_chip(tps65090->rmap, client->irq,
213			IRQF_ONESHOT | IRQF_TRIGGER_LOW, irq_base,
214			&tps65090_irq_chip, &tps65090->irq_data);
215			if (ret) {
216				dev_err(&client->dev,
217					"IRQ init failed with err: %d\n", ret);
218			return ret;
219		}
220	} else {
221		/* Don't tell children they have an IRQ that'll never fire */
222		tps65090s[CHARGER].num_resources = 0;
223	}
224
225	ret = mfd_add_devices(tps65090->dev, -1, tps65090s,
226		ARRAY_SIZE(tps65090s), NULL,
227		0, regmap_irq_get_domain(tps65090->irq_data));
228	if (ret) {
229		dev_err(&client->dev, "add mfd devices failed with err: %d\n",
230			ret);
231		goto err_irq_exit;
232	}
233
234	return 0;
235
236err_irq_exit:
237	if (client->irq)
238		regmap_del_irq_chip(client->irq, tps65090->irq_data);
239	return ret;
240}
241
242static int tps65090_i2c_remove(struct i2c_client *client)
243{
244	struct tps65090 *tps65090 = i2c_get_clientdata(client);
245
246	mfd_remove_devices(tps65090->dev);
247	if (client->irq)
248		regmap_del_irq_chip(client->irq, tps65090->irq_data);
249
250	return 0;
251}
252
253static const struct i2c_device_id tps65090_id_table[] = {
254	{ "tps65090", 0 },
255	{ },
256};
257MODULE_DEVICE_TABLE(i2c, tps65090_id_table);
258
259static struct i2c_driver tps65090_driver = {
260	.driver	= {
261		.name	= "tps65090",
262		.owner	= THIS_MODULE,
263		.of_match_table = of_match_ptr(tps65090_of_match),
264	},
265	.probe		= tps65090_i2c_probe,
266	.remove		= tps65090_i2c_remove,
267	.id_table	= tps65090_id_table,
268};
269
270static int __init tps65090_init(void)
271{
272	return i2c_add_driver(&tps65090_driver);
273}
274subsys_initcall(tps65090_init);
275
276static void __exit tps65090_exit(void)
277{
278	i2c_del_driver(&tps65090_driver);
279}
280module_exit(tps65090_exit);
281
282MODULE_DESCRIPTION("TPS65090 core driver");
283MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
284MODULE_LICENSE("GPL v2");
285