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.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_SC2730_IRQ_BASE		0x80
22#define SPRD_SC2730_IRQ_NUMS		10
23#define SPRD_SC2730_CHG_DET		0x1b9c
24#define SPRD_SC2731_IRQ_BASE		0x140
25#define SPRD_SC2731_IRQ_NUMS		16
26#define SPRD_SC2731_CHG_DET		0xedc
27
28/* PMIC charger detection definition */
29#define SPRD_PMIC_CHG_DET_DELAY_US	200000
30#define SPRD_PMIC_CHG_DET_TIMEOUT	2000000
31#define SPRD_PMIC_CHG_DET_DONE		BIT(11)
32#define SPRD_PMIC_SDP_TYPE		BIT(7)
33#define SPRD_PMIC_DCP_TYPE		BIT(6)
34#define SPRD_PMIC_CDP_TYPE		BIT(5)
35#define SPRD_PMIC_CHG_TYPE_MASK		GENMASK(7, 5)
36
37struct sprd_pmic {
38	struct regmap *regmap;
39	struct device *dev;
40	struct regmap_irq *irqs;
41	struct regmap_irq_chip irq_chip;
42	struct regmap_irq_chip_data *irq_data;
43	const struct sprd_pmic_data *pdata;
44	int irq;
45};
46
47struct sprd_pmic_data {
48	u32 irq_base;
49	u32 num_irqs;
50	u32 charger_det;
51};
52
53/*
54 * Since different PMICs of SC27xx series can have different interrupt
55 * base address and irq number, we should save irq number and irq base
56 * in the device data structure.
57 */
58static const struct sprd_pmic_data sc2730_data = {
59	.irq_base = SPRD_SC2730_IRQ_BASE,
60	.num_irqs = SPRD_SC2730_IRQ_NUMS,
61	.charger_det = SPRD_SC2730_CHG_DET,
62};
63
64static const struct sprd_pmic_data sc2731_data = {
65	.irq_base = SPRD_SC2731_IRQ_BASE,
66	.num_irqs = SPRD_SC2731_IRQ_NUMS,
67	.charger_det = SPRD_SC2731_CHG_DET,
68};
69
70enum usb_charger_type sprd_pmic_detect_charger_type(struct device *dev)
71{
72	struct spi_device *spi = to_spi_device(dev);
73	struct sprd_pmic *ddata = spi_get_drvdata(spi);
74	const struct sprd_pmic_data *pdata = ddata->pdata;
75	enum usb_charger_type type;
76	u32 val;
77	int ret;
78
79	ret = regmap_read_poll_timeout(ddata->regmap, pdata->charger_det, val,
80				       (val & SPRD_PMIC_CHG_DET_DONE),
81				       SPRD_PMIC_CHG_DET_DELAY_US,
82				       SPRD_PMIC_CHG_DET_TIMEOUT);
83	if (ret) {
84		dev_err(&spi->dev, "failed to detect charger type\n");
85		return UNKNOWN_TYPE;
86	}
87
88	switch (val & SPRD_PMIC_CHG_TYPE_MASK) {
89	case SPRD_PMIC_CDP_TYPE:
90		type = CDP_TYPE;
91		break;
92	case SPRD_PMIC_DCP_TYPE:
93		type = DCP_TYPE;
94		break;
95	case SPRD_PMIC_SDP_TYPE:
96		type = SDP_TYPE;
97		break;
98	default:
99		type = UNKNOWN_TYPE;
100		break;
101	}
102
103	return type;
104}
105EXPORT_SYMBOL_GPL(sprd_pmic_detect_charger_type);
106
107static int sprd_pmic_spi_write(void *context, const void *data, size_t count)
108{
109	struct device *dev = context;
110	struct spi_device *spi = to_spi_device(dev);
111
112	return spi_write(spi, data, count);
113}
114
115static int sprd_pmic_spi_read(void *context,
116			      const void *reg, size_t reg_size,
117			      void *val, size_t val_size)
118{
119	struct device *dev = context;
120	struct spi_device *spi = to_spi_device(dev);
121	u32 rx_buf[2] = { 0 };
122	int ret;
123
124	/* Now we only support one PMIC register to read every time. */
125	if (reg_size != sizeof(u32) || val_size != sizeof(u32))
126		return -EINVAL;
127
128	/* Copy address to read from into first element of SPI buffer. */
129	memcpy(rx_buf, reg, sizeof(u32));
130	ret = spi_read(spi, rx_buf, 1);
131	if (ret < 0)
132		return ret;
133
134	memcpy(val, rx_buf, val_size);
135	return 0;
136}
137
138static struct regmap_bus sprd_pmic_regmap = {
139	.write = sprd_pmic_spi_write,
140	.read = sprd_pmic_spi_read,
141	.reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
142	.val_format_endian_default = REGMAP_ENDIAN_NATIVE,
143};
144
145static const struct regmap_config sprd_pmic_config = {
146	.reg_bits = 32,
147	.val_bits = 32,
148	.reg_stride = 4,
149	.max_register = 0xffff,
150};
151
152static int sprd_pmic_probe(struct spi_device *spi)
153{
154	struct sprd_pmic *ddata;
155	const struct sprd_pmic_data *pdata;
156	int ret, i;
157
158	pdata = of_device_get_match_data(&spi->dev);
159	if (!pdata) {
160		dev_err(&spi->dev, "No matching driver data found\n");
161		return -EINVAL;
162	}
163
164	ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
165	if (!ddata)
166		return -ENOMEM;
167
168	ddata->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap,
169					 &spi->dev, &sprd_pmic_config);
170	if (IS_ERR(ddata->regmap)) {
171		ret = PTR_ERR(ddata->regmap);
172		dev_err(&spi->dev, "Failed to allocate register map %d\n", ret);
173		return ret;
174	}
175
176	spi_set_drvdata(spi, ddata);
177	ddata->dev = &spi->dev;
178	ddata->irq = spi->irq;
179	ddata->pdata = pdata;
180
181	ddata->irq_chip.name = dev_name(&spi->dev);
182	ddata->irq_chip.status_base =
183		pdata->irq_base + SPRD_PMIC_INT_MASK_STATUS;
184	ddata->irq_chip.unmask_base = pdata->irq_base + SPRD_PMIC_INT_EN;
185	ddata->irq_chip.ack_base = 0;
186	ddata->irq_chip.num_regs = 1;
187	ddata->irq_chip.num_irqs = pdata->num_irqs;
188
189	ddata->irqs = devm_kcalloc(&spi->dev,
190				   pdata->num_irqs, sizeof(struct regmap_irq),
191				   GFP_KERNEL);
192	if (!ddata->irqs)
193		return -ENOMEM;
194
195	ddata->irq_chip.irqs = ddata->irqs;
196	for (i = 0; i < pdata->num_irqs; i++)
197		ddata->irqs[i].mask = BIT(i);
198
199	ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq,
200				       IRQF_ONESHOT, 0,
201				       &ddata->irq_chip, &ddata->irq_data);
202	if (ret) {
203		dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret);
204		return ret;
205	}
206
207	ret = devm_of_platform_populate(&spi->dev);
208	if (ret) {
209		dev_err(&spi->dev, "Failed to populate sub-devices %d\n", ret);
210		return ret;
211	}
212
213	device_init_wakeup(&spi->dev, true);
214	return 0;
215}
216
217static int sprd_pmic_suspend(struct device *dev)
218{
219	struct sprd_pmic *ddata = dev_get_drvdata(dev);
220
221	if (device_may_wakeup(dev))
222		enable_irq_wake(ddata->irq);
223
224	return 0;
225}
226
227static int sprd_pmic_resume(struct device *dev)
228{
229	struct sprd_pmic *ddata = dev_get_drvdata(dev);
230
231	if (device_may_wakeup(dev))
232		disable_irq_wake(ddata->irq);
233
234	return 0;
235}
236
237static DEFINE_SIMPLE_DEV_PM_OPS(sprd_pmic_pm_ops,
238				sprd_pmic_suspend, sprd_pmic_resume);
239
240static const struct of_device_id sprd_pmic_match[] = {
241	{ .compatible = "sprd,sc2730", .data = &sc2730_data },
242	{ .compatible = "sprd,sc2731", .data = &sc2731_data },
243	{},
244};
245MODULE_DEVICE_TABLE(of, sprd_pmic_match);
246
247static const struct spi_device_id sprd_pmic_spi_ids[] = {
248	{ .name = "sc2730", .driver_data = (unsigned long)&sc2730_data },
249	{ .name = "sc2731", .driver_data = (unsigned long)&sc2731_data },
250	{},
251};
252MODULE_DEVICE_TABLE(spi, sprd_pmic_spi_ids);
253
254static struct spi_driver sprd_pmic_driver = {
255	.driver = {
256		.name = "sc27xx-pmic",
257		.of_match_table = sprd_pmic_match,
258		.pm = pm_sleep_ptr(&sprd_pmic_pm_ops),
259	},
260	.probe = sprd_pmic_probe,
261	.id_table = sprd_pmic_spi_ids,
262};
263
264static int __init sprd_pmic_init(void)
265{
266	return spi_register_driver(&sprd_pmic_driver);
267}
268subsys_initcall(sprd_pmic_init);
269
270static void __exit sprd_pmic_exit(void)
271{
272	spi_unregister_driver(&sprd_pmic_driver);
273}
274module_exit(sprd_pmic_exit);
275
276MODULE_LICENSE("GPL v2");
277MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver");
278MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");
279