max14577-regulator.c

  1// SPDX-License-Identifier: GPL-2.0+
  2//
  3// max14577.c - Regulator driver for the Maxim 14577/77836
  4//
  5// Copyright (C) 2013,2014 Samsung Electronics
  6// Krzysztof Kozlowski <krzk@kernel.org>
  7
  8#include <linux/module.h>
  9#include <linux/platform_device.h>
 10#include <linux/regulator/driver.h>
 11#include <linux/mfd/max14577.h>
 12#include <linux/mfd/max14577-private.h>
 13#include <linux/regulator/of_regulator.h>
 14
 15static int max14577_reg_is_enabled(struct regulator_dev *rdev)
 16{
 17	int rid = rdev_get_id(rdev);
 18	struct regmap *rmap = rdev->regmap;
 19	u8 reg_data;
 20
 21	switch (rid) {
 22	case MAX14577_CHARGER:
 23		max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, &reg_data);
 24		if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
 25			return 0;
 26		max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_data);
 27		if ((reg_data & STATUS3_CGMBC_MASK) == 0)
 28			return 0;
 29		/* MBCHOSTEN and CGMBC are on */
 30		return 1;
 31	default:
 32		return -EINVAL;
 33	}
 34}
 35
 36static int max14577_reg_get_current_limit(struct regulator_dev *rdev)
 37{
 38	u8 reg_data;
 39	struct regmap *rmap = rdev->regmap;
 40	struct max14577 *max14577 = rdev_get_drvdata(rdev);
 41	const struct maxim_charger_current *limits =
 42		&maxim_charger_currents[max14577->dev_type];
 43	int ret;
 44
 45	if (rdev_get_id(rdev) != MAX14577_CHARGER)
 46		return -EINVAL;
 47
 48	ret = max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, &reg_data);
 49	if (ret < 0)
 50		return ret;
 51
 52	if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0)
 53		return limits->min;
 54
 55	reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >>
 56			CHGCTRL4_MBCICHWRCH_SHIFT);
 57	return limits->high_start + reg_data * limits->high_step;
 58}
 59
 60static int max14577_reg_set_current_limit(struct regulator_dev *rdev,
 61		int min_uA, int max_uA)
 62{
 63	u8 reg_data;
 64	int ret;
 65	struct max14577 *max14577 = rdev_get_drvdata(rdev);
 66	const struct maxim_charger_current *limits =
 67		&maxim_charger_currents[max14577->dev_type];
 68
 69	if (rdev_get_id(rdev) != MAX14577_CHARGER)
 70		return -EINVAL;
 71
 72	ret = maxim_charger_calc_reg_current(limits, min_uA, max_uA, &reg_data);
 73	if (ret)
 74		return ret;
 75
 76	return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4,
 77			CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
 78			reg_data);
 79}
 80
 81static const struct regulator_ops max14577_safeout_ops = {
 82	.is_enabled		= regulator_is_enabled_regmap,
 83	.enable			= regulator_enable_regmap,
 84	.disable		= regulator_disable_regmap,
 85	.list_voltage		= regulator_list_voltage_linear,
 86};
 87
 88static const struct regulator_ops max14577_charger_ops = {
 89	.is_enabled		= max14577_reg_is_enabled,
 90	.enable			= regulator_enable_regmap,
 91	.disable		= regulator_disable_regmap,
 92	.get_current_limit	= max14577_reg_get_current_limit,
 93	.set_current_limit	= max14577_reg_set_current_limit,
 94};
 95
 96#define MAX14577_SAFEOUT_REG	{ \
 97	.name		= "SAFEOUT", \
 98	.of_match	= of_match_ptr("SAFEOUT"), \
 99	.regulators_node = of_match_ptr("regulators"), \
100	.id		= MAX14577_SAFEOUT, \
101	.ops		= &max14577_safeout_ops, \
102	.type		= REGULATOR_VOLTAGE, \
103	.owner		= THIS_MODULE, \
104	.n_voltages	= 1, \
105	.min_uV		= MAX14577_REGULATOR_SAFEOUT_VOLTAGE, \
106	.enable_reg	= MAX14577_REG_CONTROL2, \
107	.enable_mask	= CTRL2_SFOUTORD_MASK, \
108}
109#define MAX14577_CHARGER_REG	{ \
110	.name		= "CHARGER", \
111	.of_match	= of_match_ptr("CHARGER"), \
112	.regulators_node = of_match_ptr("regulators"), \
113	.id		= MAX14577_CHARGER, \
114	.ops		= &max14577_charger_ops, \
115	.type		= REGULATOR_CURRENT, \
116	.owner		= THIS_MODULE, \
117	.enable_reg	= MAX14577_CHG_REG_CHG_CTRL2, \
118	.enable_mask	= CHGCTRL2_MBCHOSTEN_MASK, \
119}
120
121static const struct regulator_desc max14577_supported_regulators[] = {
122	[MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG,
123	[MAX14577_CHARGER] = MAX14577_CHARGER_REG,
124};
125
126static const struct regulator_ops max77836_ldo_ops = {
127	.is_enabled		= regulator_is_enabled_regmap,
128	.enable			= regulator_enable_regmap,
129	.disable		= regulator_disable_regmap,
130	.list_voltage		= regulator_list_voltage_linear,
131	.map_voltage		= regulator_map_voltage_linear,
132	.get_voltage_sel	= regulator_get_voltage_sel_regmap,
133	.set_voltage_sel	= regulator_set_voltage_sel_regmap,
134	/* TODO: add .set_suspend_mode */
135};
136
137#define MAX77836_LDO_REG(num)	{ \
138	.name		= "LDO" # num, \
139	.of_match	= of_match_ptr("LDO" # num), \
140	.regulators_node = of_match_ptr("regulators"), \
141	.id		= MAX77836_LDO ## num, \
142	.ops		= &max77836_ldo_ops, \
143	.type		= REGULATOR_VOLTAGE, \
144	.owner		= THIS_MODULE, \
145	.n_voltages	= MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM, \
146	.min_uV		= MAX77836_REGULATOR_LDO_VOLTAGE_MIN, \
147	.uV_step	= MAX77836_REGULATOR_LDO_VOLTAGE_STEP, \
148	.enable_reg	= MAX77836_LDO_REG_CNFG1_LDO ## num, \
149	.enable_mask	= MAX77836_CNFG1_LDO_PWRMD_MASK, \
150	.vsel_reg	= MAX77836_LDO_REG_CNFG1_LDO ## num, \
151	.vsel_mask	= MAX77836_CNFG1_LDO_TV_MASK, \
152}
153
154static const struct regulator_desc max77836_supported_regulators[] = {
155	[MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG,
156	[MAX14577_CHARGER] = MAX14577_CHARGER_REG,
157	[MAX77836_LDO1] = MAX77836_LDO_REG(1),
158	[MAX77836_LDO2] = MAX77836_LDO_REG(2),
159};
160
161/*
162 * Registers for regulators of max77836 use different I2C slave addresses so
163 * different regmaps must be used for them.
164 *
165 * Returns proper regmap for accessing regulator passed by id.
166 */
167static struct regmap *max14577_get_regmap(struct max14577 *max14577,
168		int reg_id)
169{
170	switch (max14577->dev_type) {
171	case MAXIM_DEVICE_TYPE_MAX77836:
172		switch (reg_id) {
173		case MAX77836_SAFEOUT ... MAX77836_CHARGER:
174			return max14577->regmap;
175		default:
176			/* MAX77836_LDO1 ... MAX77836_LDO2 */
177			return max14577->regmap_pmic;
178		}
179
180	case MAXIM_DEVICE_TYPE_MAX14577:
181	default:
182		return max14577->regmap;
183	}
184}
185
186static int max14577_regulator_probe(struct platform_device *pdev)
187{
188	struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
189	struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
190	int i, ret = 0;
191	struct regulator_config config = {};
192	const struct regulator_desc *supported_regulators;
193	unsigned int supported_regulators_size;
194	enum maxim_device_type dev_type = max14577->dev_type;
195
196	switch (dev_type) {
197	case MAXIM_DEVICE_TYPE_MAX77836:
198		supported_regulators = max77836_supported_regulators;
199		supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators);
200		break;
201	case MAXIM_DEVICE_TYPE_MAX14577:
202	default:
203		supported_regulators = max14577_supported_regulators;
204		supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators);
205	}
206
207	config.dev = max14577->dev;
208	config.driver_data = max14577;
209
210	for (i = 0; i < supported_regulators_size; i++) {
211		struct regulator_dev *regulator;
212		/*
213		 * Index of supported_regulators[] is also the id and must
214		 * match index of pdata->regulators[].
215		 */
216		if (pdata && pdata->regulators) {
217			config.init_data = pdata->regulators[i].initdata;
218			config.of_node = pdata->regulators[i].of_node;
219		}
220		config.regmap = max14577_get_regmap(max14577,
221				supported_regulators[i].id);
222
223		regulator = devm_regulator_register(&pdev->dev,
224				&supported_regulators[i], &config);
225		if (IS_ERR(regulator)) {
226			ret = PTR_ERR(regulator);
227			dev_err(&pdev->dev,
228					"Regulator init failed for %d/%s with error: %d\n",
229					i, supported_regulators[i].name, ret);
230			return ret;
231		}
232	}
233
234	return ret;
235}
236
237static const struct platform_device_id max14577_regulator_id[] = {
238	{ "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, },
239	{ "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, },
240	{ }
241};
242MODULE_DEVICE_TABLE(platform, max14577_regulator_id);
243
244static struct platform_driver max14577_regulator_driver = {
245	.driver = {
246		   .name = "max14577-regulator",
247		   .probe_type = PROBE_PREFER_ASYNCHRONOUS,
248		   },
249	.probe		= max14577_regulator_probe,
250	.id_table	= max14577_regulator_id,
251};
252
253static int __init max14577_regulator_init(void)
254{
255	BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM);
256	BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM);
257
258	BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN +
259			(MAX77836_REGULATOR_LDO_VOLTAGE_STEP *
260			  (MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) !=
261			MAX77836_REGULATOR_LDO_VOLTAGE_MAX);
262
263	return platform_driver_register(&max14577_regulator_driver);
264}
265subsys_initcall(max14577_regulator_init);
266
267static void __exit max14577_regulator_exit(void)
268{
269	platform_driver_unregister(&max14577_regulator_driver);
270}
271module_exit(max14577_regulator_exit);
272
273MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
274MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver");
275MODULE_LICENSE("GPL");