1/*
  2 * TI LP8788 MFD - core interface
  3 *
  4 * Copyright 2012 Texas Instruments
  5 *
  6 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
  7 *
  8 * This program is free software; you can redistribute it and/or modify
  9 * it under the terms of the GNU General Public License version 2 as
 10 * published by the Free Software Foundation.
 11 *
 12 */
 13
 14#include <linux/err.h>
 15#include <linux/i2c.h>
 16#include <linux/mfd/core.h>
 17#include <linux/mfd/lp8788.h>
 18#include <linux/module.h>
 19#include <linux/slab.h>
 20
 21#define MAX_LP8788_REGISTERS		0xA2
 22
 23#define MFD_DEV_SIMPLE(_name)					\
 24{								\
 25	.name = LP8788_DEV_##_name,				\
 26}
 27
 28#define MFD_DEV_WITH_ID(_name, _id)				\
 29{								\
 30	.name = LP8788_DEV_##_name,				\
 31	.id = _id,						\
 32}
 33
 34#define MFD_DEV_WITH_RESOURCE(_name, _resource, num_resource)	\
 35{								\
 36	.name = LP8788_DEV_##_name,				\
 37	.resources = _resource,					\
 38	.num_resources = num_resource,				\
 39}
 40
 41static struct resource chg_irqs[] = {
 42	/* Charger Interrupts */
 43	{
 44		.start = LP8788_INT_CHG_INPUT_STATE,
 45		.end   = LP8788_INT_PRECHG_TIMEOUT,
 46		.name  = LP8788_CHG_IRQ,
 47		.flags = IORESOURCE_IRQ,
 48	},
 49	/* Power Routing Switch Interrupts */
 50	{
 51		.start = LP8788_INT_ENTER_SYS_SUPPORT,
 52		.end   = LP8788_INT_EXIT_SYS_SUPPORT,
 53		.name  = LP8788_PRSW_IRQ,
 54		.flags = IORESOURCE_IRQ,
 55	},
 56	/* Battery Interrupts */
 57	{
 58		.start = LP8788_INT_BATT_LOW,
 59		.end   = LP8788_INT_NO_BATT,
 60		.name  = LP8788_BATT_IRQ,
 61		.flags = IORESOURCE_IRQ,
 62	},
 63};
 64
 65static struct resource rtc_irqs[] = {
 66	{
 67		.start = LP8788_INT_RTC_ALARM1,
 68		.end   = LP8788_INT_RTC_ALARM2,
 69		.name  = LP8788_ALM_IRQ,
 70		.flags = IORESOURCE_IRQ,
 71	},
 72};
 73
 74static const struct mfd_cell lp8788_devs[] = {
 75	/* 4 bucks */
 76	MFD_DEV_WITH_ID(BUCK, 1),
 77	MFD_DEV_WITH_ID(BUCK, 2),
 78	MFD_DEV_WITH_ID(BUCK, 3),
 79	MFD_DEV_WITH_ID(BUCK, 4),
 80
 81	/* 12 digital ldos */
 82	MFD_DEV_WITH_ID(DLDO, 1),
 83	MFD_DEV_WITH_ID(DLDO, 2),
 84	MFD_DEV_WITH_ID(DLDO, 3),
 85	MFD_DEV_WITH_ID(DLDO, 4),
 86	MFD_DEV_WITH_ID(DLDO, 5),
 87	MFD_DEV_WITH_ID(DLDO, 6),
 88	MFD_DEV_WITH_ID(DLDO, 7),
 89	MFD_DEV_WITH_ID(DLDO, 8),
 90	MFD_DEV_WITH_ID(DLDO, 9),
 91	MFD_DEV_WITH_ID(DLDO, 10),
 92	MFD_DEV_WITH_ID(DLDO, 11),
 93	MFD_DEV_WITH_ID(DLDO, 12),
 94
 95	/* 10 analog ldos */
 96	MFD_DEV_WITH_ID(ALDO, 1),
 97	MFD_DEV_WITH_ID(ALDO, 2),
 98	MFD_DEV_WITH_ID(ALDO, 3),
 99	MFD_DEV_WITH_ID(ALDO, 4),
100	MFD_DEV_WITH_ID(ALDO, 5),
101	MFD_DEV_WITH_ID(ALDO, 6),
102	MFD_DEV_WITH_ID(ALDO, 7),
103	MFD_DEV_WITH_ID(ALDO, 8),
104	MFD_DEV_WITH_ID(ALDO, 9),
105	MFD_DEV_WITH_ID(ALDO, 10),
106
107	/* ADC */
108	MFD_DEV_SIMPLE(ADC),
109
110	/* battery charger */
111	MFD_DEV_WITH_RESOURCE(CHARGER, chg_irqs, ARRAY_SIZE(chg_irqs)),
112
113	/* rtc */
114	MFD_DEV_WITH_RESOURCE(RTC, rtc_irqs, ARRAY_SIZE(rtc_irqs)),
115
116	/* backlight */
117	MFD_DEV_SIMPLE(BACKLIGHT),
118
119	/* current sink for vibrator */
120	MFD_DEV_SIMPLE(VIBRATOR),
121
122	/* current sink for keypad LED */
123	MFD_DEV_SIMPLE(KEYLED),
124};
125
126int lp8788_read_byte(struct lp8788 *lp, u8 reg, u8 *data)
127{
128	int ret;
129	unsigned int val;
130
131	ret = regmap_read(lp->regmap, reg, &val);
132	if (ret < 0) {
133		dev_err(lp->dev, "failed to read 0x%.2x\n", reg);
134		return ret;
135	}
136
137	*data = (u8)val;
138	return 0;
139}
140EXPORT_SYMBOL_GPL(lp8788_read_byte);
141
142int lp8788_read_multi_bytes(struct lp8788 *lp, u8 reg, u8 *data, size_t count)
143{
144	return regmap_bulk_read(lp->regmap, reg, data, count);
145}
146EXPORT_SYMBOL_GPL(lp8788_read_multi_bytes);
147
148int lp8788_write_byte(struct lp8788 *lp, u8 reg, u8 data)
149{
150	return regmap_write(lp->regmap, reg, data);
151}
152EXPORT_SYMBOL_GPL(lp8788_write_byte);
153
154int lp8788_update_bits(struct lp8788 *lp, u8 reg, u8 mask, u8 data)
155{
156	return regmap_update_bits(lp->regmap, reg, mask, data);
157}
158EXPORT_SYMBOL_GPL(lp8788_update_bits);
159
160static int lp8788_platform_init(struct lp8788 *lp)
161{
162	struct lp8788_platform_data *pdata = lp->pdata;
163
164	return (pdata && pdata->init_func) ? pdata->init_func(lp) : 0;
165}
166
167static const struct regmap_config lp8788_regmap_config = {
168	.reg_bits = 8,
169	.val_bits = 8,
170	.max_register = MAX_LP8788_REGISTERS,
171};
172
173static int lp8788_probe(struct i2c_client *cl, const struct i2c_device_id *id)
174{
175	struct lp8788 *lp;
176	struct lp8788_platform_data *pdata = dev_get_platdata(&cl->dev);
177	int ret;
178
179	lp = devm_kzalloc(&cl->dev, sizeof(struct lp8788), GFP_KERNEL);
180	if (!lp)
181		return -ENOMEM;
182
183	lp->regmap = devm_regmap_init_i2c(cl, &lp8788_regmap_config);
184	if (IS_ERR(lp->regmap)) {
185		ret = PTR_ERR(lp->regmap);
186		dev_err(&cl->dev, "regmap init i2c err: %d\n", ret);
187		return ret;
188	}
189
190	lp->pdata = pdata;
191	lp->dev = &cl->dev;
192	i2c_set_clientdata(cl, lp);
193
194	ret = lp8788_platform_init(lp);
195	if (ret)
196		return ret;
197
198	ret = lp8788_irq_init(lp, cl->irq);
199	if (ret)
200		return ret;
201
202	return mfd_add_devices(lp->dev, -1, lp8788_devs,
203			       ARRAY_SIZE(lp8788_devs), NULL, 0, NULL);
204}
205
206static int lp8788_remove(struct i2c_client *cl)
207{
208	struct lp8788 *lp = i2c_get_clientdata(cl);
209
210	mfd_remove_devices(lp->dev);
211	lp8788_irq_exit(lp);
212	return 0;
213}
214
215static const struct i2c_device_id lp8788_ids[] = {
216	{"lp8788", 0},
217	{ }
218};
219MODULE_DEVICE_TABLE(i2c, lp8788_ids);
220
221static struct i2c_driver lp8788_driver = {
222	.driver = {
223		.name = "lp8788",
224	},
225	.probe = lp8788_probe,
226	.remove = lp8788_remove,
227	.id_table = lp8788_ids,
228};
229
230static int __init lp8788_init(void)
231{
232	return i2c_add_driver(&lp8788_driver);
233}
234subsys_initcall(lp8788_init);
235
236static void __exit lp8788_exit(void)
237{
238	i2c_del_driver(&lp8788_driver);
239}
240module_exit(lp8788_exit);
241
242MODULE_DESCRIPTION("TI LP8788 MFD Driver");
243MODULE_AUTHOR("Milo Kim");
244MODULE_LICENSE("GPL");