1// SPDX-License-Identifier: GPL-2.0
2/*
3 * MFD core driver for Intel Cherrytrail Whiskey Cove PMIC
4 *
5 * Copyright (C) 2017 Hans de Goede <hdegoede@redhat.com>
6 *
7 * Based on various non upstream patches to support the CHT Whiskey Cove PMIC:
8 * Copyright (C) 2013-2015 Intel Corporation. All rights reserved.
9 */
10
11#include <linux/acpi.h>
12#include <linux/delay.h>
13#include <linux/err.h>
14#include <linux/i2c.h>
15#include <linux/interrupt.h>
16#include <linux/kernel.h>
17#include <linux/mfd/core.h>
18#include <linux/mfd/intel_soc_pmic.h>
19#include <linux/regmap.h>
20
21/* PMIC device registers */
22#define REG_OFFSET_MASK		GENMASK(7, 0)
23#define REG_ADDR_MASK		GENMASK(15, 8)
24#define REG_ADDR_SHIFT		8
25
26#define CHT_WC_IRQLVL1		0x6e02
27#define CHT_WC_IRQLVL1_MASK	0x6e0e
28
29/* Whiskey Cove PMIC share same ACPI ID between different platforms */
30#define CHT_WC_HRV		3
31
32/* Level 1 IRQs (level 2 IRQs are handled in the child device drivers) */
33enum {
34	CHT_WC_PWRSRC_IRQ = 0,
35	CHT_WC_THRM_IRQ,
36	CHT_WC_BCU_IRQ,
37	CHT_WC_ADC_IRQ,
38	CHT_WC_EXT_CHGR_IRQ,
39	CHT_WC_GPIO_IRQ,
40	/* There is no irq 6 */
41	CHT_WC_CRIT_IRQ = 7,
42};
43
44static struct resource cht_wc_pwrsrc_resources[] = {
45	DEFINE_RES_IRQ(CHT_WC_PWRSRC_IRQ),
46};
47
48static struct resource cht_wc_ext_charger_resources[] = {
49	DEFINE_RES_IRQ(CHT_WC_EXT_CHGR_IRQ),
50};
51
52static struct mfd_cell cht_wc_dev[] = {
53	{
54		.name = "cht_wcove_pwrsrc",
55		.num_resources = ARRAY_SIZE(cht_wc_pwrsrc_resources),
56		.resources = cht_wc_pwrsrc_resources,
57	}, {
58		.name = "cht_wcove_ext_chgr",
59		.num_resources = ARRAY_SIZE(cht_wc_ext_charger_resources),
60		.resources = cht_wc_ext_charger_resources,
61	},
62	{	.name = "cht_wcove_region", },
63	{	.name = "cht_wcove_leds", },
64};
65
66/*
67 * The CHT Whiskey Cove covers multiple I2C addresses, with a 1 Byte
68 * register address space per I2C address, so we use 16 bit register
69 * addresses where the high 8 bits contain the I2C client address.
70 */
71static int cht_wc_byte_reg_read(void *context, unsigned int reg,
72				unsigned int *val)
73{
74	struct i2c_client *client = context;
75	int ret, orig_addr = client->addr;
76
77	if (!(reg & REG_ADDR_MASK)) {
78		dev_err(&client->dev, "Error I2C address not specified\n");
79		return -EINVAL;
80	}
81
82	client->addr = (reg & REG_ADDR_MASK) >> REG_ADDR_SHIFT;
83	ret = i2c_smbus_read_byte_data(client, reg & REG_OFFSET_MASK);
84	client->addr = orig_addr;
85
86	if (ret < 0)
87		return ret;
88
89	*val = ret;
90	return 0;
91}
92
93static int cht_wc_byte_reg_write(void *context, unsigned int reg,
94				 unsigned int val)
95{
96	struct i2c_client *client = context;
97	int ret, orig_addr = client->addr;
98
99	if (!(reg & REG_ADDR_MASK)) {
100		dev_err(&client->dev, "Error I2C address not specified\n");
101		return -EINVAL;
102	}
103
104	client->addr = (reg & REG_ADDR_MASK) >> REG_ADDR_SHIFT;
105	ret = i2c_smbus_write_byte_data(client, reg & REG_OFFSET_MASK, val);
106	client->addr = orig_addr;
107
108	return ret;
109}
110
111static const struct regmap_config cht_wc_regmap_cfg = {
112	.reg_bits = 16,
113	.val_bits = 8,
114	.reg_write = cht_wc_byte_reg_write,
115	.reg_read = cht_wc_byte_reg_read,
116};
117
118static const struct regmap_irq cht_wc_regmap_irqs[] = {
119	REGMAP_IRQ_REG(CHT_WC_PWRSRC_IRQ, 0, BIT(CHT_WC_PWRSRC_IRQ)),
120	REGMAP_IRQ_REG(CHT_WC_THRM_IRQ, 0, BIT(CHT_WC_THRM_IRQ)),
121	REGMAP_IRQ_REG(CHT_WC_BCU_IRQ, 0, BIT(CHT_WC_BCU_IRQ)),
122	REGMAP_IRQ_REG(CHT_WC_ADC_IRQ, 0, BIT(CHT_WC_ADC_IRQ)),
123	REGMAP_IRQ_REG(CHT_WC_EXT_CHGR_IRQ, 0, BIT(CHT_WC_EXT_CHGR_IRQ)),
124	REGMAP_IRQ_REG(CHT_WC_GPIO_IRQ, 0, BIT(CHT_WC_GPIO_IRQ)),
125	REGMAP_IRQ_REG(CHT_WC_CRIT_IRQ, 0, BIT(CHT_WC_CRIT_IRQ)),
126};
127
128static const struct regmap_irq_chip cht_wc_regmap_irq_chip = {
129	.name = "cht_wc_irq_chip",
130	.status_base = CHT_WC_IRQLVL1,
131	.mask_base = CHT_WC_IRQLVL1_MASK,
132	.irqs = cht_wc_regmap_irqs,
133	.num_irqs = ARRAY_SIZE(cht_wc_regmap_irqs),
134	.num_regs = 1,
135};
136
137static int cht_wc_probe(struct i2c_client *client)
138{
139	struct device *dev = &client->dev;
140	struct intel_soc_pmic *pmic;
141	acpi_status status;
142	unsigned long long hrv;
143	int ret;
144
145	status = acpi_evaluate_integer(ACPI_HANDLE(dev), "_HRV", NULL, &hrv);
146	if (ACPI_FAILURE(status)) {
147		dev_err(dev, "Failed to get PMIC hardware revision\n");
148		return -ENODEV;
149	}
150	if (hrv != CHT_WC_HRV) {
151		dev_err(dev, "Invalid PMIC hardware revision: %llu\n", hrv);
152		return -ENODEV;
153	}
154	if (client->irq < 0) {
155		dev_err(dev, "Invalid IRQ\n");
156		return -EINVAL;
157	}
158
159	pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
160	if (!pmic)
161		return -ENOMEM;
162
163	pmic->irq = client->irq;
164	pmic->dev = dev;
165	i2c_set_clientdata(client, pmic);
166
167	pmic->regmap = devm_regmap_init(dev, NULL, client, &cht_wc_regmap_cfg);
168	if (IS_ERR(pmic->regmap))
169		return PTR_ERR(pmic->regmap);
170
171	ret = devm_regmap_add_irq_chip(dev, pmic->regmap, pmic->irq,
172				       IRQF_ONESHOT | IRQF_SHARED, 0,
173				       &cht_wc_regmap_irq_chip,
174				       &pmic->irq_chip_data);
175	if (ret)
176		return ret;
177
178	return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
179				cht_wc_dev, ARRAY_SIZE(cht_wc_dev), NULL, 0,
180				regmap_irq_get_domain(pmic->irq_chip_data));
181}
182
183static void cht_wc_shutdown(struct i2c_client *client)
184{
185	struct intel_soc_pmic *pmic = i2c_get_clientdata(client);
186
187	disable_irq(pmic->irq);
188}
189
190static int __maybe_unused cht_wc_suspend(struct device *dev)
191{
192	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
193
194	disable_irq(pmic->irq);
195
196	return 0;
197}
198
199static int __maybe_unused cht_wc_resume(struct device *dev)
200{
201	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
202
203	enable_irq(pmic->irq);
204
205	return 0;
206}
207static SIMPLE_DEV_PM_OPS(cht_wc_pm_ops, cht_wc_suspend, cht_wc_resume);
208
209static const struct i2c_device_id cht_wc_i2c_id[] = {
210	{ }
211};
212
213static const struct acpi_device_id cht_wc_acpi_ids[] = {
214	{ "INT34D3", },
215	{ }
216};
217
218static struct i2c_driver cht_wc_driver = {
219	.driver	= {
220		.name	= "CHT Whiskey Cove PMIC",
221		.pm     = &cht_wc_pm_ops,
222		.acpi_match_table = cht_wc_acpi_ids,
223	},
224	.probe_new = cht_wc_probe,
225	.shutdown = cht_wc_shutdown,
226	.id_table = cht_wc_i2c_id,
227};
228builtin_i2c_driver(cht_wc_driver);
229