1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2017 Spreadtrum Communications Inc.
4 */
5
6#include <linux/interrupt.h>
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/mfd/core.h>
10#include <linux/mfd/sc27xx-pmic.h>
11#include <linux/of_device.h>
12#include <linux/of_platform.h>
13#include <linux/regmap.h>
14#include <linux/spi/spi.h>
15#include <uapi/linux/usb/charger.h>
16
17#define SPRD_PMIC_INT_MASK_STATUS	0x0
18#define SPRD_PMIC_INT_RAW_STATUS	0x4
19#define SPRD_PMIC_INT_EN		0x8
20
21#define SPRD_SC2731_IRQ_BASE		0x140
22#define SPRD_SC2731_IRQ_NUMS		16
23#define SPRD_SC2731_CHG_DET		0xedc
24
25/* PMIC charger detection definition */
26#define SPRD_PMIC_CHG_DET_DELAY_US	200000
27#define SPRD_PMIC_CHG_DET_TIMEOUT	2000000
28#define SPRD_PMIC_CHG_DET_DONE		BIT(11)
29#define SPRD_PMIC_SDP_TYPE		BIT(7)
30#define SPRD_PMIC_DCP_TYPE		BIT(6)
31#define SPRD_PMIC_CDP_TYPE		BIT(5)
32#define SPRD_PMIC_CHG_TYPE_MASK		GENMASK(7, 5)
33
34struct sprd_pmic {
35	struct regmap *regmap;
36	struct device *dev;
37	struct regmap_irq *irqs;
38	struct regmap_irq_chip irq_chip;
39	struct regmap_irq_chip_data *irq_data;
40	const struct sprd_pmic_data *pdata;
41	int irq;
42};
43
44struct sprd_pmic_data {
45	u32 irq_base;
46	u32 num_irqs;
47	u32 charger_det;
48};
49
50/*
51 * Since different PMICs of SC27xx series can have different interrupt
52 * base address and irq number, we should save irq number and irq base
53 * in the device data structure.
54 */
55static const struct sprd_pmic_data sc2731_data = {
56	.irq_base = SPRD_SC2731_IRQ_BASE,
57	.num_irqs = SPRD_SC2731_IRQ_NUMS,
58	.charger_det = SPRD_SC2731_CHG_DET,
59};
60
61enum usb_charger_type sprd_pmic_detect_charger_type(struct device *dev)
62{
63	struct spi_device *spi = to_spi_device(dev);
64	struct sprd_pmic *ddata = spi_get_drvdata(spi);
65	const struct sprd_pmic_data *pdata = ddata->pdata;
66	enum usb_charger_type type;
67	u32 val;
68	int ret;
69
70	ret = regmap_read_poll_timeout(ddata->regmap, pdata->charger_det, val,
71				       (val & SPRD_PMIC_CHG_DET_DONE),
72				       SPRD_PMIC_CHG_DET_DELAY_US,
73				       SPRD_PMIC_CHG_DET_TIMEOUT);
74	if (ret) {
75		dev_err(&spi->dev, "failed to detect charger type\n");
76		return UNKNOWN_TYPE;
77	}
78
79	switch (val & SPRD_PMIC_CHG_TYPE_MASK) {
80	case SPRD_PMIC_CDP_TYPE:
81		type = CDP_TYPE;
82		break;
83	case SPRD_PMIC_DCP_TYPE:
84		type = DCP_TYPE;
85		break;
86	case SPRD_PMIC_SDP_TYPE:
87		type = SDP_TYPE;
88		break;
89	default:
90		type = UNKNOWN_TYPE;
91		break;
92	}
93
94	return type;
95}
96EXPORT_SYMBOL_GPL(sprd_pmic_detect_charger_type);
97
98static int sprd_pmic_spi_write(void *context, const void *data, size_t count)
99{
100	struct device *dev = context;
101	struct spi_device *spi = to_spi_device(dev);
102
103	return spi_write(spi, data, count);
104}
105
106static int sprd_pmic_spi_read(void *context,
107			      const void *reg, size_t reg_size,
108			      void *val, size_t val_size)
109{
110	struct device *dev = context;
111	struct spi_device *spi = to_spi_device(dev);
112	u32 rx_buf[2] = { 0 };
113	int ret;
114
115	/* Now we only support one PMIC register to read every time. */
116	if (reg_size != sizeof(u32) || val_size != sizeof(u32))
117		return -EINVAL;
118
119	/* Copy address to read from into first element of SPI buffer. */
120	memcpy(rx_buf, reg, sizeof(u32));
121	ret = spi_read(spi, rx_buf, 1);
122	if (ret < 0)
123		return ret;
124
125	memcpy(val, rx_buf, val_size);
126	return 0;
127}
128
129static struct regmap_bus sprd_pmic_regmap = {
130	.write = sprd_pmic_spi_write,
131	.read = sprd_pmic_spi_read,
132	.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
133	.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
134};
135
136static const struct regmap_config sprd_pmic_config = {
137	.reg_bits = 32,
138	.val_bits = 32,
139	.reg_stride = 4,
140	.max_register = 0xffff,
141};
142
143static int sprd_pmic_probe(struct spi_device *spi)
144{
145	struct sprd_pmic *ddata;
146	const struct sprd_pmic_data *pdata;
147	int ret, i;
148
149	pdata = of_device_get_match_data(&spi->dev);
150	if (!pdata) {
151		dev_err(&spi->dev, "No matching driver data found\n");
152		return -EINVAL;
153	}
154
155	ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
156	if (!ddata)
157		return -ENOMEM;
158
159	ddata->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap,
160					 &spi->dev, &sprd_pmic_config);
161	if (IS_ERR(ddata->regmap)) {
162		ret = PTR_ERR(ddata->regmap);
163		dev_err(&spi->dev, "Failed to allocate register map %d\n", ret);
164		return ret;
165	}
166
167	spi_set_drvdata(spi, ddata);
168	ddata->dev = &spi->dev;
169	ddata->irq = spi->irq;
170	ddata->pdata = pdata;
171
172	ddata->irq_chip.name = dev_name(&spi->dev);
173	ddata->irq_chip.status_base =
174		pdata->irq_base + SPRD_PMIC_INT_MASK_STATUS;
175	ddata->irq_chip.mask_base = pdata->irq_base + SPRD_PMIC_INT_EN;
176	ddata->irq_chip.ack_base = 0;
177	ddata->irq_chip.num_regs = 1;
178	ddata->irq_chip.num_irqs = pdata->num_irqs;
179	ddata->irq_chip.mask_invert = true;
180
181	ddata->irqs = devm_kcalloc(&spi->dev,
182				   pdata->num_irqs, sizeof(struct regmap_irq),
183				   GFP_KERNEL);
184	if (!ddata->irqs)
185		return -ENOMEM;
186
187	ddata->irq_chip.irqs = ddata->irqs;
188	for (i = 0; i < pdata->num_irqs; i++)
189		ddata->irqs[i].mask = BIT(i);
190
191	ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq,
192				       IRQF_ONESHOT, 0,
193				       &ddata->irq_chip, &ddata->irq_data);
194	if (ret) {
195		dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret);
196		return ret;
197	}
198
199	ret = devm_of_platform_populate(&spi->dev);
200	if (ret) {
201		dev_err(&spi->dev, "Failed to populate sub-devices %d\n", ret);
202		return ret;
203	}
204
205	device_init_wakeup(&spi->dev, true);
206	return 0;
207}
208
209#ifdef CONFIG_PM_SLEEP
210static int sprd_pmic_suspend(struct device *dev)
211{
212	struct sprd_pmic *ddata = dev_get_drvdata(dev);
213
214	if (device_may_wakeup(dev))
215		enable_irq_wake(ddata->irq);
216
217	return 0;
218}
219
220static int sprd_pmic_resume(struct device *dev)
221{
222	struct sprd_pmic *ddata = dev_get_drvdata(dev);
223
224	if (device_may_wakeup(dev))
225		disable_irq_wake(ddata->irq);
226
227	return 0;
228}
229#endif
230
231static SIMPLE_DEV_PM_OPS(sprd_pmic_pm_ops, sprd_pmic_suspend, sprd_pmic_resume);
232
233static const struct of_device_id sprd_pmic_match[] = {
234	{ .compatible = "sprd,sc2731", .data = &sc2731_data },
235	{},
236};
237MODULE_DEVICE_TABLE(of, sprd_pmic_match);
238
239static struct spi_driver sprd_pmic_driver = {
240	.driver = {
241		.name = "sc27xx-pmic",
242		.of_match_table = sprd_pmic_match,
243		.pm = &sprd_pmic_pm_ops,
244	},
245	.probe = sprd_pmic_probe,
246};
247
248static int __init sprd_pmic_init(void)
249{
250	return spi_register_driver(&sprd_pmic_driver);
251}
252subsys_initcall(sprd_pmic_init);
253
254static void __exit sprd_pmic_exit(void)
255{
256	spi_unregister_driver(&sprd_pmic_driver);
257}
258module_exit(sprd_pmic_exit);
259
260MODULE_LICENSE("GPL v2");
261MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver");
262MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");
263