1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * XPower AXP288 PMIC operation region driver
4  *
5  * Copyright (C) 2014 Intel Corporation. All rights reserved.
6  */
7 
8 #include <linux/acpi.h>
9 #include <linux/init.h>
10 #include <linux/mfd/axp20x.h>
11 #include <linux/regmap.h>
12 #include <linux/platform_device.h>
13 #include <asm/iosf_mbi.h>
14 #include "intel_pmic.h"
15 
16 #define XPOWER_GPADC_LOW	0x5b
17 #define XPOWER_GPI1_CTRL	0x92
18 
19 #define GPI1_LDO_MASK		GENMASK(2, 0)
20 #define GPI1_LDO_ON		(3 << 0)
21 #define GPI1_LDO_OFF		(4 << 0)
22 
23 #define AXP288_ADC_TS_CURRENT_ON_OFF_MASK		GENMASK(1, 0)
24 #define AXP288_ADC_TS_CURRENT_OFF			(0 << 0)
25 #define AXP288_ADC_TS_CURRENT_ON_WHEN_CHARGING		(1 << 0)
26 #define AXP288_ADC_TS_CURRENT_ON_ONDEMAND		(2 << 0)
27 #define AXP288_ADC_TS_CURRENT_ON			(3 << 0)
28 
29 static struct pmic_table power_table[] = {
30 	{
31 		.address = 0x00,
32 		.reg = 0x13,
33 		.bit = 0x05,
34 	}, /* ALD1 */
35 	{
36 		.address = 0x04,
37 		.reg = 0x13,
38 		.bit = 0x06,
39 	}, /* ALD2 */
40 	{
41 		.address = 0x08,
42 		.reg = 0x13,
43 		.bit = 0x07,
44 	}, /* ALD3 */
45 	{
46 		.address = 0x0c,
47 		.reg = 0x12,
48 		.bit = 0x03,
49 	}, /* DLD1 */
50 	{
51 		.address = 0x10,
52 		.reg = 0x12,
53 		.bit = 0x04,
54 	}, /* DLD2 */
55 	{
56 		.address = 0x14,
57 		.reg = 0x12,
58 		.bit = 0x05,
59 	}, /* DLD3 */
60 	{
61 		.address = 0x18,
62 		.reg = 0x12,
63 		.bit = 0x06,
64 	}, /* DLD4 */
65 	{
66 		.address = 0x1c,
67 		.reg = 0x12,
68 		.bit = 0x00,
69 	}, /* ELD1 */
70 	{
71 		.address = 0x20,
72 		.reg = 0x12,
73 		.bit = 0x01,
74 	}, /* ELD2 */
75 	{
76 		.address = 0x24,
77 		.reg = 0x12,
78 		.bit = 0x02,
79 	}, /* ELD3 */
80 	{
81 		.address = 0x28,
82 		.reg = 0x13,
83 		.bit = 0x02,
84 	}, /* FLD1 */
85 	{
86 		.address = 0x2c,
87 		.reg = 0x13,
88 		.bit = 0x03,
89 	}, /* FLD2 */
90 	{
91 		.address = 0x30,
92 		.reg = 0x13,
93 		.bit = 0x04,
94 	}, /* FLD3 */
95 	{
96 		.address = 0x34,
97 		.reg = 0x10,
98 		.bit = 0x03,
99 	}, /* BUC1 */
100 	{
101 		.address = 0x38,
102 		.reg = 0x10,
103 		.bit = 0x06,
104 	}, /* BUC2 */
105 	{
106 		.address = 0x3c,
107 		.reg = 0x10,
108 		.bit = 0x05,
109 	}, /* BUC3 */
110 	{
111 		.address = 0x40,
112 		.reg = 0x10,
113 		.bit = 0x04,
114 	}, /* BUC4 */
115 	{
116 		.address = 0x44,
117 		.reg = 0x10,
118 		.bit = 0x01,
119 	}, /* BUC5 */
120 	{
121 		.address = 0x48,
122 		.reg = 0x10,
123 		.bit = 0x00
124 	}, /* BUC6 */
125 	{
126 		.address = 0x4c,
127 		.reg = 0x92,
128 	}, /* GPI1 */
129 };
130 
131 /* TMP0 - TMP5 are the same, all from GPADC */
132 static struct pmic_table thermal_table[] = {
133 	{
134 		.address = 0x00,
135 		.reg = XPOWER_GPADC_LOW
136 	},
137 	{
138 		.address = 0x0c,
139 		.reg = XPOWER_GPADC_LOW
140 	},
141 	{
142 		.address = 0x18,
143 		.reg = XPOWER_GPADC_LOW
144 	},
145 	{
146 		.address = 0x24,
147 		.reg = XPOWER_GPADC_LOW
148 	},
149 	{
150 		.address = 0x30,
151 		.reg = XPOWER_GPADC_LOW
152 	},
153 	{
154 		.address = 0x3c,
155 		.reg = XPOWER_GPADC_LOW
156 	},
157 };
158 
159 static int intel_xpower_pmic_get_power(struct regmap *regmap, int reg,
160 				       int bit, u64 *value)
161 {
162 	int data;
163 
164 	if (regmap_read(regmap, reg, &data))
165 		return -EIO;
166 
167 	/* GPIO1 LDO regulator needs special handling */
168 	if (reg == XPOWER_GPI1_CTRL)
169 		*value = ((data & GPI1_LDO_MASK) == GPI1_LDO_ON);
170 	else
171 		*value = (data & BIT(bit)) ? 1 : 0;
172 
173 	return 0;
174 }
175 
176 static int intel_xpower_pmic_update_power(struct regmap *regmap, int reg,
177 					  int bit, bool on)
178 {
179 	int data, ret;
180 
181 	/* GPIO1 LDO regulator needs special handling */
182 	if (reg == XPOWER_GPI1_CTRL)
183 		return regmap_update_bits(regmap, reg, GPI1_LDO_MASK,
184 					  on ? GPI1_LDO_ON : GPI1_LDO_OFF);
185 
186 	ret = iosf_mbi_block_punit_i2c_access();
187 	if (ret)
188 		return ret;
189 
190 	if (regmap_read(regmap, reg, &data)) {
191 		ret = -EIO;
192 		goto out;
193 	}
194 
195 	if (on)
196 		data |= BIT(bit);
197 	else
198 		data &= ~BIT(bit);
199 
200 	if (regmap_write(regmap, reg, data))
201 		ret = -EIO;
202 out:
203 	iosf_mbi_unblock_punit_i2c_access();
204 
205 	return ret;
206 }
207 
208 /**
209  * intel_xpower_pmic_get_raw_temp(): Get raw temperature reading from the PMIC
210  *
211  * @regmap: regmap of the PMIC device
212  * @reg: register to get the reading
213  *
214  * Return a positive value on success, errno on failure.
215  */
216 static int intel_xpower_pmic_get_raw_temp(struct regmap *regmap, int reg)
217 {
218 	int ret, adc_ts_pin_ctrl;
219 	u8 buf[2];
220 
221 	/*
222 	 * The current-source used for the battery temp-sensor (TS) is shared
223 	 * with the GPADC. For proper fuel-gauge and charger operation the TS
224 	 * current-source needs to be permanently on. But to read the GPADC we
225 	 * need to temporary switch the TS current-source to ondemand, so that
226 	 * the GPADC can use it, otherwise we will always read an all 0 value.
227 	 *
228 	 * Note that the switching from on to on-ondemand is not necessary
229 	 * when the TS current-source is off (this happens on devices which
230 	 * do not use the TS-pin).
231 	 */
232 	ret = regmap_read(regmap, AXP288_ADC_TS_PIN_CTRL, &adc_ts_pin_ctrl);
233 	if (ret)
234 		return ret;
235 
236 	if (adc_ts_pin_ctrl & AXP288_ADC_TS_CURRENT_ON_OFF_MASK) {
237 		ret = regmap_update_bits(regmap, AXP288_ADC_TS_PIN_CTRL,
238 					 AXP288_ADC_TS_CURRENT_ON_OFF_MASK,
239 					 AXP288_ADC_TS_CURRENT_ON_ONDEMAND);
240 		if (ret)
241 			return ret;
242 
243 		/* Wait a bit after switching the current-source */
244 		usleep_range(6000, 10000);
245 	}
246 
247 	ret = regmap_bulk_read(regmap, AXP288_GP_ADC_H, buf, 2);
248 	if (ret == 0)
249 		ret = (buf[0] << 4) + ((buf[1] >> 4) & 0x0f);
250 
251 	if (adc_ts_pin_ctrl & AXP288_ADC_TS_CURRENT_ON_OFF_MASK) {
252 		regmap_update_bits(regmap, AXP288_ADC_TS_PIN_CTRL,
253 				   AXP288_ADC_TS_CURRENT_ON_OFF_MASK,
254 				   AXP288_ADC_TS_CURRENT_ON);
255 	}
256 
257 	return ret;
258 }
259 
260 static struct intel_pmic_opregion_data intel_xpower_pmic_opregion_data = {
261 	.get_power = intel_xpower_pmic_get_power,
262 	.update_power = intel_xpower_pmic_update_power,
263 	.get_raw_temp = intel_xpower_pmic_get_raw_temp,
264 	.power_table = power_table,
265 	.power_table_count = ARRAY_SIZE(power_table),
266 	.thermal_table = thermal_table,
267 	.thermal_table_count = ARRAY_SIZE(thermal_table),
268 	.pmic_i2c_address = 0x34,
269 };
270 
271 static acpi_status intel_xpower_pmic_gpio_handler(u32 function,
272 		acpi_physical_address address, u32 bit_width, u64 *value,
273 		void *handler_context, void *region_context)
274 {
275 	return AE_OK;
276 }
277 
278 static int intel_xpower_pmic_opregion_probe(struct platform_device *pdev)
279 {
280 	struct device *parent = pdev->dev.parent;
281 	struct axp20x_dev *axp20x = dev_get_drvdata(parent);
282 	acpi_status status;
283 	int result;
284 
285 	status = acpi_install_address_space_handler(ACPI_HANDLE(parent),
286 			ACPI_ADR_SPACE_GPIO, intel_xpower_pmic_gpio_handler,
287 			NULL, NULL);
288 	if (ACPI_FAILURE(status))
289 		return -ENODEV;
290 
291 	result = intel_pmic_install_opregion_handler(&pdev->dev,
292 					ACPI_HANDLE(parent), axp20x->regmap,
293 					&intel_xpower_pmic_opregion_data);
294 	if (result)
295 		acpi_remove_address_space_handler(ACPI_HANDLE(parent),
296 						  ACPI_ADR_SPACE_GPIO,
297 						  intel_xpower_pmic_gpio_handler);
298 
299 	return result;
300 }
301 
302 static struct platform_driver intel_xpower_pmic_opregion_driver = {
303 	.probe = intel_xpower_pmic_opregion_probe,
304 	.driver = {
305 		.name = "axp288_pmic_acpi",
306 	},
307 };
308 builtin_platform_driver(intel_xpower_pmic_opregion_driver);
309