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) */
33 enum {
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
44 static struct resource cht_wc_pwrsrc_resources[] = {
45 DEFINE_RES_IRQ(CHT_WC_PWRSRC_IRQ),
46 };
47
48 static struct resource cht_wc_ext_charger_resources[] = {
49 DEFINE_RES_IRQ(CHT_WC_EXT_CHGR_IRQ),
50 };
51
52 static 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 */
cht_wc_byte_reg_read(void * context,unsigned int reg,unsigned int * val)71 static 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
cht_wc_byte_reg_write(void * context,unsigned int reg,unsigned int val)93 static 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
111 static 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
118 static 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
128 static 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
cht_wc_probe(struct i2c_client * client)137 static 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
cht_wc_shutdown(struct i2c_client * client)183 static 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
cht_wc_suspend(struct device * dev)190 static 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
cht_wc_resume(struct device * dev)199 static 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 }
207 static SIMPLE_DEV_PM_OPS(cht_wc_pm_ops, cht_wc_suspend, cht_wc_resume);
208
209 static const struct i2c_device_id cht_wc_i2c_id[] = {
210 { }
211 };
212
213 static const struct acpi_device_id cht_wc_acpi_ids[] = {
214 { "INT34D3", },
215 { }
216 };
217
218 static 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 };
228 builtin_i2c_driver(cht_wc_driver);
229
