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(map: regmap, reg, val: &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 ret = iosf_mbi_block_punit_i2c_access();
182 if (ret)
183 return ret;
184
185 /* GPIO1 LDO regulator needs special handling */
186 if (reg == XPOWER_GPI1_CTRL) {
187 ret = regmap_update_bits(map: regmap, reg, GPI1_LDO_MASK,
188 val: on ? GPI1_LDO_ON : GPI1_LDO_OFF);
189 goto out;
190 }
191
192 if (regmap_read(map: regmap, reg, val: &data)) {
193 ret = -EIO;
194 goto out;
195 }
196
197 if (on)
198 data |= BIT(bit);
199 else
200 data &= ~BIT(bit);
201
202 if (regmap_write(map: regmap, reg, val: data))
203 ret = -EIO;
204out:
205 iosf_mbi_unblock_punit_i2c_access();
206
207 return ret;
208}
209
210/**
211 * intel_xpower_pmic_get_raw_temp(): Get raw temperature reading from the PMIC
212 *
213 * @regmap: regmap of the PMIC device
214 * @reg: register to get the reading
215 *
216 * Return a positive value on success, errno on failure.
217 */
218static int intel_xpower_pmic_get_raw_temp(struct regmap *regmap, int reg)
219{
220 int ret, adc_ts_pin_ctrl;
221 u8 buf[2];
222
223 /*
224 * The current-source used for the battery temp-sensor (TS) is shared
225 * with the GPADC. For proper fuel-gauge and charger operation the TS
226 * current-source needs to be permanently on. But to read the GPADC we
227 * need to temporary switch the TS current-source to ondemand, so that
228 * the GPADC can use it, otherwise we will always read an all 0 value.
229 *
230 * Note that the switching from on to on-ondemand is not necessary
231 * when the TS current-source is off (this happens on devices which
232 * do not use the TS-pin).
233 */
234 ret = regmap_read(map: regmap, AXP288_ADC_TS_PIN_CTRL, val: &adc_ts_pin_ctrl);
235 if (ret)
236 return ret;
237
238 if (adc_ts_pin_ctrl & AXP288_ADC_TS_CURRENT_ON_OFF_MASK) {
239 /*
240 * AXP288_ADC_TS_PIN_CTRL reads are cached by the regmap, so
241 * this does to a single I2C-transfer, and thus there is no
242 * need to explicitly call iosf_mbi_block_punit_i2c_access().
243 */
244 ret = regmap_update_bits(map: regmap, AXP288_ADC_TS_PIN_CTRL,
245 AXP288_ADC_TS_CURRENT_ON_OFF_MASK,
246 AXP288_ADC_TS_CURRENT_ON_ONDEMAND);
247 if (ret)
248 return ret;
249
250 /* Wait a bit after switching the current-source */
251 usleep_range(min: 6000, max: 10000);
252 }
253
254 ret = iosf_mbi_block_punit_i2c_access();
255 if (ret)
256 return ret;
257
258 ret = regmap_bulk_read(map: regmap, AXP288_GP_ADC_H, val: buf, val_count: 2);
259 if (ret == 0)
260 ret = (buf[0] << 4) + ((buf[1] >> 4) & 0x0f);
261
262 if (adc_ts_pin_ctrl & AXP288_ADC_TS_CURRENT_ON_OFF_MASK) {
263 regmap_update_bits(map: regmap, AXP288_ADC_TS_PIN_CTRL,
264 AXP288_ADC_TS_CURRENT_ON_OFF_MASK,
265 AXP288_ADC_TS_CURRENT_ON);
266 }
267
268 iosf_mbi_unblock_punit_i2c_access();
269
270 return ret;
271}
272
273static int intel_xpower_exec_mipi_pmic_seq_element(struct regmap *regmap,
274 u16 i2c_address, u32 reg_address,
275 u32 value, u32 mask)
276{
277 int ret;
278
279 if (i2c_address != 0x34) {
280 pr_err("%s: Unexpected i2c-addr: 0x%02x (reg-addr 0x%x value 0x%x mask 0x%x)\n",
281 __func__, i2c_address, reg_address, value, mask);
282 return -ENXIO;
283 }
284
285 ret = iosf_mbi_block_punit_i2c_access();
286 if (ret)
287 return ret;
288
289 ret = regmap_update_bits(map: regmap, reg: reg_address, mask, val: value);
290
291 iosf_mbi_unblock_punit_i2c_access();
292
293 return ret;
294}
295
296static int intel_xpower_lpat_raw_to_temp(struct acpi_lpat_conversion_table *lpat_table,
297 int raw)
298{
299 struct acpi_lpat first = lpat_table->lpat[0];
300 struct acpi_lpat last = lpat_table->lpat[lpat_table->lpat_count - 1];
301
302 /*
303 * Some LPAT tables in the ACPI Device for the AXP288 PMIC for some
304 * reason only describe a small temperature range, e.g. 27° - 37°
305 * Celcius. Resulting in errors when the tablet is idle in a cool room.
306 *
307 * To avoid these errors clamp the raw value to be inside the LPAT.
308 */
309 if (first.raw < last.raw)
310 raw = clamp(raw, first.raw, last.raw);
311 else
312 raw = clamp(raw, last.raw, first.raw);
313
314 return acpi_lpat_raw_to_temp(lpat_table, raw);
315}
316
317static const struct intel_pmic_opregion_data intel_xpower_pmic_opregion_data = {
318 .get_power = intel_xpower_pmic_get_power,
319 .update_power = intel_xpower_pmic_update_power,
320 .get_raw_temp = intel_xpower_pmic_get_raw_temp,
321 .exec_mipi_pmic_seq_element = intel_xpower_exec_mipi_pmic_seq_element,
322 .lpat_raw_to_temp = intel_xpower_lpat_raw_to_temp,
323 .power_table = power_table,
324 .power_table_count = ARRAY_SIZE(power_table),
325 .thermal_table = thermal_table,
326 .thermal_table_count = ARRAY_SIZE(thermal_table),
327 .pmic_i2c_address = 0x34,
328};
329
330static acpi_status intel_xpower_pmic_gpio_handler(u32 function,
331 acpi_physical_address address, u32 bit_width, u64 *value,
332 void *handler_context, void *region_context)
333{
334 return AE_OK;
335}
336
337static int intel_xpower_pmic_opregion_probe(struct platform_device *pdev)
338{
339 struct device *parent = pdev->dev.parent;
340 struct axp20x_dev *axp20x = dev_get_drvdata(dev: parent);
341 acpi_status status;
342 int result;
343
344 status = acpi_install_address_space_handler(ACPI_HANDLE(parent),
345 ACPI_ADR_SPACE_GPIO, handler: intel_xpower_pmic_gpio_handler,
346 NULL, NULL);
347 if (ACPI_FAILURE(status))
348 return -ENODEV;
349
350 result = intel_pmic_install_opregion_handler(dev: &pdev->dev,
351 ACPI_HANDLE(parent), regmap: axp20x->regmap,
352 d: &intel_xpower_pmic_opregion_data);
353 if (result)
354 acpi_remove_address_space_handler(ACPI_HANDLE(parent),
355 ACPI_ADR_SPACE_GPIO,
356 handler: intel_xpower_pmic_gpio_handler);
357
358 return result;
359}
360
361static struct platform_driver intel_xpower_pmic_opregion_driver = {
362 .probe = intel_xpower_pmic_opregion_probe,
363 .driver = {
364 .name = "axp288_pmic_acpi",
365 },
366};
367builtin_platform_driver(intel_xpower_pmic_opregion_driver);
368

source code of linux/drivers/acpi/pmic/intel_pmic_xpower.c