1/*
2 * intel_pmic_xpower.c - XPower AXP288 PMIC operation region driver
3 *
4 * Copyright (C) 2014 Intel Corporation. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 * GNU General Public License for more details.
14 */
15
16#include <linux/module.h>
17#include <linux/acpi.h>
18#include <linux/mfd/axp20x.h>
19#include <linux/regmap.h>
20#include <linux/platform_device.h>
21#include <linux/iio/consumer.h>
22#include "intel_pmic.h"
23
24#define XPOWER_GPADC_LOW	0x5b
25
26static struct pmic_table power_table[] = {
27	{
28		.address = 0x00,
29		.reg = 0x13,
30		.bit = 0x05,
31	},
32	{
33		.address = 0x04,
34		.reg = 0x13,
35		.bit = 0x06,
36	},
37	{
38		.address = 0x08,
39		.reg = 0x13,
40		.bit = 0x07,
41	},
42	{
43		.address = 0x0c,
44		.reg = 0x12,
45		.bit = 0x03,
46	},
47	{
48		.address = 0x10,
49		.reg = 0x12,
50		.bit = 0x04,
51	},
52	{
53		.address = 0x14,
54		.reg = 0x12,
55		.bit = 0x05,
56	},
57	{
58		.address = 0x18,
59		.reg = 0x12,
60		.bit = 0x06,
61	},
62	{
63		.address = 0x1c,
64		.reg = 0x12,
65		.bit = 0x00,
66	},
67	{
68		.address = 0x20,
69		.reg = 0x12,
70		.bit = 0x01,
71	},
72	{
73		.address = 0x24,
74		.reg = 0x12,
75		.bit = 0x02,
76	},
77	{
78		.address = 0x28,
79		.reg = 0x13,
80		.bit = 0x02,
81	},
82	{
83		.address = 0x2c,
84		.reg = 0x13,
85		.bit = 0x03,
86	},
87	{
88		.address = 0x30,
89		.reg = 0x13,
90		.bit = 0x04,
91	},
92	{
93		.address = 0x38,
94		.reg = 0x10,
95		.bit = 0x03,
96	},
97	{
98		.address = 0x3c,
99		.reg = 0x10,
100		.bit = 0x06,
101	},
102	{
103		.address = 0x40,
104		.reg = 0x10,
105		.bit = 0x05,
106	},
107	{
108		.address = 0x44,
109		.reg = 0x10,
110		.bit = 0x04,
111	},
112	{
113		.address = 0x48,
114		.reg = 0x10,
115		.bit = 0x01,
116	},
117	{
118		.address = 0x4c,
119		.reg = 0x10,
120		.bit = 0x00
121	},
122};
123
124/* TMP0 - TMP5 are the same, all from GPADC */
125static struct pmic_table thermal_table[] = {
126	{
127		.address = 0x00,
128		.reg = XPOWER_GPADC_LOW
129	},
130	{
131		.address = 0x0c,
132		.reg = XPOWER_GPADC_LOW
133	},
134	{
135		.address = 0x18,
136		.reg = XPOWER_GPADC_LOW
137	},
138	{
139		.address = 0x24,
140		.reg = XPOWER_GPADC_LOW
141	},
142	{
143		.address = 0x30,
144		.reg = XPOWER_GPADC_LOW
145	},
146	{
147		.address = 0x3c,
148		.reg = XPOWER_GPADC_LOW
149	},
150};
151
152static int intel_xpower_pmic_get_power(struct regmap *regmap, int reg,
153				       int bit, u64 *value)
154{
155	int data;
156
157	if (regmap_read(regmap, reg, &data))
158		return -EIO;
159
160	*value = (data & BIT(bit)) ? 1 : 0;
161	return 0;
162}
163
164static int intel_xpower_pmic_update_power(struct regmap *regmap, int reg,
165					  int bit, bool on)
166{
167	int data;
168
169	if (regmap_read(regmap, reg, &data))
170		return -EIO;
171
172	if (on)
173		data |= BIT(bit);
174	else
175		data &= ~BIT(bit);
176
177	if (regmap_write(regmap, reg, data))
178		return -EIO;
179
180	return 0;
181}
182
183/**
184 * intel_xpower_pmic_get_raw_temp(): Get raw temperature reading from the PMIC
185 *
186 * @regmap: regmap of the PMIC device
187 * @reg: register to get the reading
188 *
189 * We could get the sensor value by manipulating the HW regs here, but since
190 * the axp288 IIO driver may also access the same regs at the same time, the
191 * APIs provided by IIO subsystem are used here instead to avoid problems. As
192 * a result, the two passed in params are of no actual use.
193 *
194 * Return a positive value on success, errno on failure.
195 */
196static int intel_xpower_pmic_get_raw_temp(struct regmap *regmap, int reg)
197{
198	struct iio_channel *gpadc_chan;
199	int ret, val;
200
201	gpadc_chan = iio_channel_get(NULL, "axp288-system-temp");
202	if (IS_ERR_OR_NULL(gpadc_chan))
203		return -EACCES;
204
205	ret = iio_read_channel_raw(gpadc_chan, &val);
206	if (ret < 0)
207		val = ret;
208
209	iio_channel_release(gpadc_chan);
210	return val;
211}
212
213static struct intel_pmic_opregion_data intel_xpower_pmic_opregion_data = {
214	.get_power = intel_xpower_pmic_get_power,
215	.update_power = intel_xpower_pmic_update_power,
216	.get_raw_temp = intel_xpower_pmic_get_raw_temp,
217	.power_table = power_table,
218	.power_table_count = ARRAY_SIZE(power_table),
219	.thermal_table = thermal_table,
220	.thermal_table_count = ARRAY_SIZE(thermal_table),
221};
222
223static acpi_status intel_xpower_pmic_gpio_handler(u32 function,
224		acpi_physical_address address, u32 bit_width, u64 *value,
225		void *handler_context, void *region_context)
226{
227	return AE_OK;
228}
229
230static int intel_xpower_pmic_opregion_probe(struct platform_device *pdev)
231{
232	struct device *parent = pdev->dev.parent;
233	struct axp20x_dev *axp20x = dev_get_drvdata(parent);
234	acpi_status status;
235	int result;
236
237	status = acpi_install_address_space_handler(ACPI_HANDLE(parent),
238			ACPI_ADR_SPACE_GPIO, intel_xpower_pmic_gpio_handler,
239			NULL, NULL);
240	if (ACPI_FAILURE(status))
241		return -ENODEV;
242
243	result = intel_pmic_install_opregion_handler(&pdev->dev,
244					ACPI_HANDLE(parent), axp20x->regmap,
245					&intel_xpower_pmic_opregion_data);
246	if (result)
247		acpi_remove_address_space_handler(ACPI_HANDLE(parent),
248						  ACPI_ADR_SPACE_GPIO,
249						  intel_xpower_pmic_gpio_handler);
250
251	return result;
252}
253
254static struct platform_driver intel_xpower_pmic_opregion_driver = {
255	.probe = intel_xpower_pmic_opregion_probe,
256	.driver = {
257		.name = "axp288_pmic_acpi",
258	},
259};
260
261static int __init intel_xpower_pmic_opregion_driver_init(void)
262{
263	return platform_driver_register(&intel_xpower_pmic_opregion_driver);
264}
265module_init(intel_xpower_pmic_opregion_driver_init);
266
267MODULE_DESCRIPTION("XPower AXP288 ACPI operation region driver");
268MODULE_LICENSE("GPL");
269