1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Device access for Crystal Cove PMIC
4  *
5  * Copyright (C) 2012-2014, 2022 Intel Corporation. All rights reserved.
6  *
7  * Author: Yang, Bin <bin.yang@intel.com>
8  * Author: Zhu, Lejun <lejun.zhu@linux.intel.com>
9  */
10 
11 #include <linux/i2c.h>
12 #include <linux/interrupt.h>
13 #include <linux/mod_devicetable.h>
14 #include <linux/module.h>
15 #include <linux/mfd/core.h>
16 #include <linux/mfd/intel_soc_pmic.h>
17 #include <linux/platform_data/x86/soc.h>
18 #include <linux/pwm.h>
19 #include <linux/regmap.h>
20 
21 #define CRYSTAL_COVE_MAX_REGISTER	0xC6
22 
23 #define CRYSTAL_COVE_REG_IRQLVL1	0x02
24 #define CRYSTAL_COVE_REG_MIRQLVL1	0x0E
25 
26 #define CRYSTAL_COVE_IRQ_PWRSRC		0
27 #define CRYSTAL_COVE_IRQ_THRM		1
28 #define CRYSTAL_COVE_IRQ_BCU		2
29 #define CRYSTAL_COVE_IRQ_ADC		3
30 #define CRYSTAL_COVE_IRQ_CHGR		4
31 #define CRYSTAL_COVE_IRQ_GPIO		5
32 #define CRYSTAL_COVE_IRQ_VHDMIOCP	6
33 
34 static const struct resource pwrsrc_resources[] = {
35 	DEFINE_RES_IRQ_NAMED(CRYSTAL_COVE_IRQ_PWRSRC, "PWRSRC"),
36 };
37 
38 static const struct resource thermal_resources[] = {
39 	DEFINE_RES_IRQ_NAMED(CRYSTAL_COVE_IRQ_THRM, "THERMAL"),
40 };
41 
42 static const struct resource bcu_resources[] = {
43 	DEFINE_RES_IRQ_NAMED(CRYSTAL_COVE_IRQ_BCU, "BCU"),
44 };
45 
46 static const struct resource adc_resources[] = {
47 	DEFINE_RES_IRQ_NAMED(CRYSTAL_COVE_IRQ_ADC, "ADC"),
48 };
49 
50 static const struct resource charger_resources[] = {
51 	DEFINE_RES_IRQ_NAMED(CRYSTAL_COVE_IRQ_CHGR, "CHGR"),
52 };
53 
54 static const struct resource gpio_resources[] = {
55 	DEFINE_RES_IRQ_NAMED(CRYSTAL_COVE_IRQ_GPIO, "GPIO"),
56 };
57 
58 static struct mfd_cell crystal_cove_byt_dev[] = {
59 	{
60 		.name = "crystal_cove_pwrsrc",
61 		.num_resources = ARRAY_SIZE(pwrsrc_resources),
62 		.resources = pwrsrc_resources,
63 	},
64 	{
65 		.name = "crystal_cove_thermal",
66 		.num_resources = ARRAY_SIZE(thermal_resources),
67 		.resources = thermal_resources,
68 	},
69 	{
70 		.name = "crystal_cove_bcu",
71 		.num_resources = ARRAY_SIZE(bcu_resources),
72 		.resources = bcu_resources,
73 	},
74 	{
75 		.name = "crystal_cove_adc",
76 		.num_resources = ARRAY_SIZE(adc_resources),
77 		.resources = adc_resources,
78 	},
79 	{
80 		.name = "crystal_cove_charger",
81 		.num_resources = ARRAY_SIZE(charger_resources),
82 		.resources = charger_resources,
83 	},
84 	{
85 		.name = "crystal_cove_gpio",
86 		.num_resources = ARRAY_SIZE(gpio_resources),
87 		.resources = gpio_resources,
88 	},
89 	{
90 		.name = "byt_crystal_cove_pmic",
91 	},
92 	{
93 		.name = "crystal_cove_pwm",
94 	},
95 };
96 
97 static struct mfd_cell crystal_cove_cht_dev[] = {
98 	{
99 		.name = "crystal_cove_gpio",
100 		.num_resources = ARRAY_SIZE(gpio_resources),
101 		.resources = gpio_resources,
102 	},
103 	{
104 		.name = "cht_crystal_cove_pmic",
105 	},
106 	{
107 		.name = "crystal_cove_pwm",
108 	},
109 };
110 
111 static const struct regmap_config crystal_cove_regmap_config = {
112 	.reg_bits = 8,
113 	.val_bits = 8,
114 
115 	.max_register = CRYSTAL_COVE_MAX_REGISTER,
116 	.cache_type = REGCACHE_NONE,
117 };
118 
119 static const struct regmap_irq crystal_cove_irqs[] = {
120 	REGMAP_IRQ_REG(CRYSTAL_COVE_IRQ_PWRSRC, 0, BIT(CRYSTAL_COVE_IRQ_PWRSRC)),
121 	REGMAP_IRQ_REG(CRYSTAL_COVE_IRQ_THRM, 0, BIT(CRYSTAL_COVE_IRQ_THRM)),
122 	REGMAP_IRQ_REG(CRYSTAL_COVE_IRQ_BCU, 0, BIT(CRYSTAL_COVE_IRQ_BCU)),
123 	REGMAP_IRQ_REG(CRYSTAL_COVE_IRQ_ADC, 0, BIT(CRYSTAL_COVE_IRQ_ADC)),
124 	REGMAP_IRQ_REG(CRYSTAL_COVE_IRQ_CHGR, 0, BIT(CRYSTAL_COVE_IRQ_CHGR)),
125 	REGMAP_IRQ_REG(CRYSTAL_COVE_IRQ_GPIO, 0, BIT(CRYSTAL_COVE_IRQ_GPIO)),
126 	REGMAP_IRQ_REG(CRYSTAL_COVE_IRQ_VHDMIOCP, 0, BIT(CRYSTAL_COVE_IRQ_VHDMIOCP)),
127 };
128 
129 static const struct regmap_irq_chip crystal_cove_irq_chip = {
130 	.name = "Crystal Cove",
131 	.irqs = crystal_cove_irqs,
132 	.num_irqs = ARRAY_SIZE(crystal_cove_irqs),
133 	.num_regs = 1,
134 	.status_base = CRYSTAL_COVE_REG_IRQLVL1,
135 	.mask_base = CRYSTAL_COVE_REG_MIRQLVL1,
136 };
137 
138 /* PWM consumed by the Intel GFX */
139 static struct pwm_lookup crc_pwm_lookup[] = {
140 	PWM_LOOKUP("crystal_cove_pwm", 0, "0000:00:02.0", "pwm_pmic_backlight", 0, PWM_POLARITY_NORMAL),
141 };
142 
143 struct crystal_cove_config {
144 	unsigned long irq_flags;
145 	struct mfd_cell *cell_dev;
146 	int n_cell_devs;
147 	const struct regmap_config *regmap_config;
148 	const struct regmap_irq_chip *irq_chip;
149 };
150 
151 static const struct crystal_cove_config crystal_cove_config_byt_crc = {
152 	.irq_flags = IRQF_TRIGGER_RISING,
153 	.cell_dev = crystal_cove_byt_dev,
154 	.n_cell_devs = ARRAY_SIZE(crystal_cove_byt_dev),
155 	.regmap_config = &crystal_cove_regmap_config,
156 	.irq_chip = &crystal_cove_irq_chip,
157 };
158 
159 static const struct crystal_cove_config crystal_cove_config_cht_crc = {
160 	.irq_flags = IRQF_TRIGGER_RISING,
161 	.cell_dev = crystal_cove_cht_dev,
162 	.n_cell_devs = ARRAY_SIZE(crystal_cove_cht_dev),
163 	.regmap_config = &crystal_cove_regmap_config,
164 	.irq_chip = &crystal_cove_irq_chip,
165 };
166 
crystal_cove_i2c_probe(struct i2c_client * i2c)167 static int crystal_cove_i2c_probe(struct i2c_client *i2c)
168 {
169 	const struct crystal_cove_config *config;
170 	struct device *dev = &i2c->dev;
171 	struct intel_soc_pmic *pmic;
172 	int ret;
173 
174 	if (soc_intel_is_byt())
175 		config = &crystal_cove_config_byt_crc;
176 	else
177 		config = &crystal_cove_config_cht_crc;
178 
179 	pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
180 	if (!pmic)
181 		return -ENOMEM;
182 
183 	i2c_set_clientdata(i2c, pmic);
184 
185 	pmic->regmap = devm_regmap_init_i2c(i2c, config->regmap_config);
186 	if (IS_ERR(pmic->regmap))
187 		return PTR_ERR(pmic->regmap);
188 
189 	pmic->irq = i2c->irq;
190 
191 	ret = devm_regmap_add_irq_chip(dev, pmic->regmap, pmic->irq,
192 				       config->irq_flags | IRQF_ONESHOT,
193 				       0, config->irq_chip, &pmic->irq_chip_data);
194 	if (ret)
195 		return ret;
196 
197 	ret = enable_irq_wake(pmic->irq);
198 	if (ret)
199 		dev_warn(dev, "Can't enable IRQ as wake source: %d\n", ret);
200 
201 	/* Add lookup table for crc-pwm */
202 	pwm_add_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
203 
204 	/* To distuingish this domain from the GPIO/charger's irqchip domains */
205 	irq_domain_update_bus_token(regmap_irq_get_domain(pmic->irq_chip_data),
206 				    DOMAIN_BUS_NEXUS);
207 
208 	ret = mfd_add_devices(dev, PLATFORM_DEVID_NONE, config->cell_dev,
209 			      config->n_cell_devs, NULL, 0,
210 			      regmap_irq_get_domain(pmic->irq_chip_data));
211 	if (ret)
212 		pwm_remove_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
213 
214 	return ret;
215 }
216 
crystal_cove_i2c_remove(struct i2c_client * i2c)217 static void crystal_cove_i2c_remove(struct i2c_client *i2c)
218 {
219 	/* remove crc-pwm lookup table */
220 	pwm_remove_table(crc_pwm_lookup, ARRAY_SIZE(crc_pwm_lookup));
221 
222 	mfd_remove_devices(&i2c->dev);
223 }
224 
crystal_cove_shutdown(struct i2c_client * i2c)225 static void crystal_cove_shutdown(struct i2c_client *i2c)
226 {
227 	struct intel_soc_pmic *pmic = i2c_get_clientdata(i2c);
228 
229 	disable_irq(pmic->irq);
230 
231 	return;
232 }
233 
crystal_cove_suspend(struct device * dev)234 static int crystal_cove_suspend(struct device *dev)
235 {
236 	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
237 
238 	disable_irq(pmic->irq);
239 
240 	return 0;
241 }
242 
crystal_cove_resume(struct device * dev)243 static int crystal_cove_resume(struct device *dev)
244 {
245 	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
246 
247 	enable_irq(pmic->irq);
248 
249 	return 0;
250 }
251 
252 static DEFINE_SIMPLE_DEV_PM_OPS(crystal_cove_pm_ops, crystal_cove_suspend, crystal_cove_resume);
253 
254 static const struct acpi_device_id crystal_cove_acpi_match[] = {
255 	{ "INT33FD" },
256 	{ },
257 };
258 MODULE_DEVICE_TABLE(acpi, crystal_cove_acpi_match);
259 
260 static struct i2c_driver crystal_cove_i2c_driver = {
261 	.driver = {
262 		.name = "crystal_cove_i2c",
263 		.pm = pm_sleep_ptr(&crystal_cove_pm_ops),
264 		.acpi_match_table = crystal_cove_acpi_match,
265 	},
266 	.probe = crystal_cove_i2c_probe,
267 	.remove = crystal_cove_i2c_remove,
268 	.shutdown = crystal_cove_shutdown,
269 };
270 
271 module_i2c_driver(crystal_cove_i2c_driver);
272 
273 MODULE_DESCRIPTION("I2C driver for Intel SoC PMIC");
274 MODULE_AUTHOR("Yang, Bin <bin.yang@intel.com>");
275 MODULE_AUTHOR("Zhu, Lejun <lejun.zhu@linux.intel.com>");
276