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
29static 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 */
132static 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
159static 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
176static 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;
202out:
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 */
216static 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
260static 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
271static 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
278static 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
302static struct platform_driver intel_xpower_pmic_opregion_driver = {
303	.probe = intel_xpower_pmic_opregion_probe,
304	.driver = {
305		.name = "axp288_pmic_acpi",
306	},
307};
308builtin_platform_driver(intel_xpower_pmic_opregion_driver);
309