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/dmi.h>
14 #include <linux/err.h>
15 #include <linux/i2c.h>
16 #include <linux/interrupt.h>
17 #include <linux/kernel.h>
18 #include <linux/mfd/core.h>
19 #include <linux/mfd/intel_soc_pmic.h>
20 #include <linux/regmap.h>
21 
22 /* PMIC device registers */
23 #define REG_OFFSET_MASK		GENMASK(7, 0)
24 #define REG_ADDR_MASK		GENMASK(15, 8)
25 #define REG_ADDR_SHIFT		8
26 
27 #define CHT_WC_IRQLVL1		0x6e02
28 #define CHT_WC_IRQLVL1_MASK	0x6e0e
29 
30 /* Whiskey Cove PMIC share same ACPI ID between different platforms */
31 #define CHT_WC_HRV		3
32 
33 /* Level 1 IRQs (level 2 IRQs are handled in the child device drivers) */
34 enum {
35 	CHT_WC_PWRSRC_IRQ = 0,
36 	CHT_WC_THRM_IRQ,
37 	CHT_WC_BCU_IRQ,
38 	CHT_WC_ADC_IRQ,
39 	CHT_WC_EXT_CHGR_IRQ,
40 	CHT_WC_GPIO_IRQ,
41 	/* There is no irq 6 */
42 	CHT_WC_CRIT_IRQ = 7,
43 };
44 
45 static const struct resource cht_wc_pwrsrc_resources[] = {
46 	DEFINE_RES_IRQ(CHT_WC_PWRSRC_IRQ),
47 };
48 
49 static const struct resource cht_wc_ext_charger_resources[] = {
50 	DEFINE_RES_IRQ(CHT_WC_EXT_CHGR_IRQ),
51 };
52 
53 static struct mfd_cell cht_wc_dev[] = {
54 	{
55 		.name = "cht_wcove_pwrsrc",
56 		.num_resources = ARRAY_SIZE(cht_wc_pwrsrc_resources),
57 		.resources = cht_wc_pwrsrc_resources,
58 	}, {
59 		.name = "cht_wcove_ext_chgr",
60 		.num_resources = ARRAY_SIZE(cht_wc_ext_charger_resources),
61 		.resources = cht_wc_ext_charger_resources,
62 	},
63 	{	.name = "cht_wcove_region", },
64 	{	.name = "cht_wcove_leds", },
65 };
66 
67 /*
68  * The CHT Whiskey Cove covers multiple I2C addresses, with a 1 Byte
69  * register address space per I2C address, so we use 16 bit register
70  * addresses where the high 8 bits contain the I2C client address.
71  */
72 static int cht_wc_byte_reg_read(void *context, unsigned int reg,
73 				unsigned int *val)
74 {
75 	struct i2c_client *client = context;
76 	int ret, orig_addr = client->addr;
77 
78 	if (!(reg & REG_ADDR_MASK)) {
79 		dev_err(&client->dev, "Error I2C address not specified\n");
80 		return -EINVAL;
81 	}
82 
83 	client->addr = (reg & REG_ADDR_MASK) >> REG_ADDR_SHIFT;
84 	ret = i2c_smbus_read_byte_data(client, reg & REG_OFFSET_MASK);
85 	client->addr = orig_addr;
86 
87 	if (ret < 0)
88 		return ret;
89 
90 	*val = ret;
91 	return 0;
92 }
93 
94 static int cht_wc_byte_reg_write(void *context, unsigned int reg,
95 				 unsigned int val)
96 {
97 	struct i2c_client *client = context;
98 	int ret, orig_addr = client->addr;
99 
100 	if (!(reg & REG_ADDR_MASK)) {
101 		dev_err(&client->dev, "Error I2C address not specified\n");
102 		return -EINVAL;
103 	}
104 
105 	client->addr = (reg & REG_ADDR_MASK) >> REG_ADDR_SHIFT;
106 	ret = i2c_smbus_write_byte_data(client, reg & REG_OFFSET_MASK, val);
107 	client->addr = orig_addr;
108 
109 	return ret;
110 }
111 
112 static const struct regmap_config cht_wc_regmap_cfg = {
113 	.reg_bits = 16,
114 	.val_bits = 8,
115 	.reg_write = cht_wc_byte_reg_write,
116 	.reg_read = cht_wc_byte_reg_read,
117 };
118 
119 static const struct regmap_irq cht_wc_regmap_irqs[] = {
120 	REGMAP_IRQ_REG(CHT_WC_PWRSRC_IRQ, 0, BIT(CHT_WC_PWRSRC_IRQ)),
121 	REGMAP_IRQ_REG(CHT_WC_THRM_IRQ, 0, BIT(CHT_WC_THRM_IRQ)),
122 	REGMAP_IRQ_REG(CHT_WC_BCU_IRQ, 0, BIT(CHT_WC_BCU_IRQ)),
123 	REGMAP_IRQ_REG(CHT_WC_ADC_IRQ, 0, BIT(CHT_WC_ADC_IRQ)),
124 	REGMAP_IRQ_REG(CHT_WC_EXT_CHGR_IRQ, 0, BIT(CHT_WC_EXT_CHGR_IRQ)),
125 	REGMAP_IRQ_REG(CHT_WC_GPIO_IRQ, 0, BIT(CHT_WC_GPIO_IRQ)),
126 	REGMAP_IRQ_REG(CHT_WC_CRIT_IRQ, 0, BIT(CHT_WC_CRIT_IRQ)),
127 };
128 
129 static const struct regmap_irq_chip cht_wc_regmap_irq_chip = {
130 	.name = "cht_wc_irq_chip",
131 	.status_base = CHT_WC_IRQLVL1,
132 	.mask_base = CHT_WC_IRQLVL1_MASK,
133 	.irqs = cht_wc_regmap_irqs,
134 	.num_irqs = ARRAY_SIZE(cht_wc_regmap_irqs),
135 	.num_regs = 1,
136 };
137 
138 static const struct dmi_system_id cht_wc_model_dmi_ids[] = {
139 	{
140 		/* GPD win / GPD pocket mini laptops */
141 		.driver_data = (void *)(long)INTEL_CHT_WC_GPD_WIN_POCKET,
142 		/*
143 		 * This DMI match may not seem unique, but it is. In the 67000+
144 		 * DMI decode dumps from linux-hardware.org only 116 have
145 		 * board_vendor set to "AMI Corporation" and of those 116 only
146 		 * the GPD win's and pocket's board_name is "Default string".
147 		 */
148 		.matches = {
149 			DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "AMI Corporation"),
150 			DMI_EXACT_MATCH(DMI_BOARD_NAME, "Default string"),
151 			DMI_EXACT_MATCH(DMI_BOARD_SERIAL, "Default string"),
152 			DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Default string"),
153 		},
154 	}, {
155 		/* Xiaomi Mi Pad 2 */
156 		.driver_data = (void *)(long)INTEL_CHT_WC_XIAOMI_MIPAD2,
157 		.matches = {
158 			DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
159 			DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
160 		},
161 	}, {
162 		/* Lenovo Yoga Book X90F / X91F / X91L */
163 		.driver_data = (void *)(long)INTEL_CHT_WC_LENOVO_YOGABOOK1,
164 		.matches = {
165 			/* Non exact match to match all versions */
166 			DMI_MATCH(DMI_PRODUCT_NAME, "Lenovo YB1-X9"),
167 		},
168 	},
169 	{ }
170 };
171 
172 static int cht_wc_probe(struct i2c_client *client)
173 {
174 	struct device *dev = &client->dev;
175 	const struct dmi_system_id *id;
176 	struct intel_soc_pmic *pmic;
177 	acpi_status status;
178 	unsigned long long hrv;
179 	int ret;
180 
181 	status = acpi_evaluate_integer(ACPI_HANDLE(dev), "_HRV", NULL, &hrv);
182 	if (ACPI_FAILURE(status))
183 		return dev_err_probe(dev, -ENODEV, "Failed to get PMIC hardware revision\n");
184 	if (hrv != CHT_WC_HRV)
185 		return dev_err_probe(dev, -ENODEV, "Invalid PMIC hardware revision: %llu\n", hrv);
186 
187 	if (client->irq < 0)
188 		return dev_err_probe(dev, -EINVAL, "Invalid IRQ\n");
189 
190 	pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
191 	if (!pmic)
192 		return -ENOMEM;
193 
194 	id = dmi_first_match(cht_wc_model_dmi_ids);
195 	if (id)
196 		pmic->cht_wc_model = (long)id->driver_data;
197 
198 	pmic->irq = client->irq;
199 	pmic->dev = dev;
200 	i2c_set_clientdata(client, pmic);
201 
202 	pmic->regmap = devm_regmap_init(dev, NULL, client, &cht_wc_regmap_cfg);
203 	if (IS_ERR(pmic->regmap))
204 		return PTR_ERR(pmic->regmap);
205 
206 	ret = devm_regmap_add_irq_chip(dev, pmic->regmap, pmic->irq,
207 				       IRQF_ONESHOT | IRQF_SHARED, 0,
208 				       &cht_wc_regmap_irq_chip,
209 				       &pmic->irq_chip_data);
210 	if (ret)
211 		return ret;
212 
213 	return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
214 				cht_wc_dev, ARRAY_SIZE(cht_wc_dev), NULL, 0,
215 				regmap_irq_get_domain(pmic->irq_chip_data));
216 }
217 
218 static void cht_wc_shutdown(struct i2c_client *client)
219 {
220 	struct intel_soc_pmic *pmic = i2c_get_clientdata(client);
221 
222 	disable_irq(pmic->irq);
223 }
224 
225 static int cht_wc_suspend(struct device *dev)
226 {
227 	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
228 
229 	disable_irq(pmic->irq);
230 
231 	return 0;
232 }
233 
234 static int cht_wc_resume(struct device *dev)
235 {
236 	struct intel_soc_pmic *pmic = dev_get_drvdata(dev);
237 
238 	enable_irq(pmic->irq);
239 
240 	return 0;
241 }
242 static DEFINE_SIMPLE_DEV_PM_OPS(cht_wc_pm_ops, cht_wc_suspend, cht_wc_resume);
243 
244 static const struct i2c_device_id cht_wc_i2c_id[] = {
245 	{ }
246 };
247 
248 static const struct acpi_device_id cht_wc_acpi_ids[] = {
249 	{ "INT34D3", },
250 	{ }
251 };
252 
253 static struct i2c_driver cht_wc_driver = {
254 	.driver	= {
255 		.name	= "CHT Whiskey Cove PMIC",
256 		.pm     = pm_sleep_ptr(&cht_wc_pm_ops),
257 		.acpi_match_table = cht_wc_acpi_ids,
258 	},
259 	.probe_new = cht_wc_probe,
260 	.shutdown = cht_wc_shutdown,
261 	.id_table = cht_wc_i2c_id,
262 };
263 builtin_i2c_driver(cht_wc_driver);
264