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 
intel_xpower_pmic_get_power(struct regmap * regmap,int reg,int bit,u64 * value)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 
intel_xpower_pmic_update_power(struct regmap * regmap,int reg,int bit,bool on)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 	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(regmap, reg, GPI1_LDO_MASK,
188 					 on ? GPI1_LDO_ON : GPI1_LDO_OFF);
189 		goto out;
190 	}
191 
192 	if (regmap_read(regmap, reg, &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(regmap, reg, data))
203 		ret = -EIO;
204 out:
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  */
intel_xpower_pmic_get_raw_temp(struct regmap * regmap,int reg)218 static 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(regmap, AXP288_ADC_TS_PIN_CTRL, &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(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(6000, 10000);
252 	}
253 
254 	ret = iosf_mbi_block_punit_i2c_access();
255 	if (ret)
256 		return ret;
257 
258 	ret = regmap_bulk_read(regmap, AXP288_GP_ADC_H, buf, 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(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 
intel_xpower_exec_mipi_pmic_seq_element(struct regmap * regmap,u16 i2c_address,u32 reg_address,u32 value,u32 mask)273 static 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(regmap, reg_address, mask, value);
290 
291 	iosf_mbi_unblock_punit_i2c_access();
292 
293 	return ret;
294 }
295 
intel_xpower_lpat_raw_to_temp(struct acpi_lpat_conversion_table * lpat_table,int raw)296 static 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 
317 static 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 
intel_xpower_pmic_gpio_handler(u32 function,acpi_physical_address address,u32 bit_width,u64 * value,void * handler_context,void * region_context)330 static 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 
intel_xpower_pmic_opregion_probe(struct platform_device * pdev)337 static 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(parent);
341 	acpi_status status;
342 	int result;
343 
344 	status = acpi_install_address_space_handler(ACPI_HANDLE(parent),
345 			ACPI_ADR_SPACE_GPIO, intel_xpower_pmic_gpio_handler,
346 			NULL, NULL);
347 	if (ACPI_FAILURE(status))
348 		return -ENODEV;
349 
350 	result = intel_pmic_install_opregion_handler(&pdev->dev,
351 					ACPI_HANDLE(parent), axp20x->regmap,
352 					&intel_xpower_pmic_opregion_data);
353 	if (result)
354 		acpi_remove_address_space_handler(ACPI_HANDLE(parent),
355 						  ACPI_ADR_SPACE_GPIO,
356 						  intel_xpower_pmic_gpio_handler);
357 
358 	return result;
359 }
360 
361 static struct platform_driver intel_xpower_pmic_opregion_driver = {
362 	.probe = intel_xpower_pmic_opregion_probe,
363 	.driver = {
364 		.name = "axp288_pmic_acpi",
365 	},
366 };
367 builtin_platform_driver(intel_xpower_pmic_opregion_driver);
368