1/*
  2 * GPIO driver for Analog Devices ADP5520 MFD PMICs
  3 *
  4 * Copyright 2009 Analog Devices Inc.
  5 *
  6 * Licensed under the GPL-2 or later.
  7 */
  8
  9#include <linux/module.h>
 10#include <linux/slab.h>
 11#include <linux/kernel.h>
 12#include <linux/init.h>
 13#include <linux/platform_device.h>
 14#include <linux/mfd/adp5520.h>
 15
 16#include <linux/gpio.h>
 17
 18struct adp5520_gpio {
 19	struct device *master;
 20	struct gpio_chip gpio_chip;
 21	unsigned char lut[ADP5520_MAXGPIOS];
 22	unsigned long output;
 23};
 24
 25static int adp5520_gpio_get_value(struct gpio_chip *chip, unsigned off)
 26{
 27	struct adp5520_gpio *dev;
 28	uint8_t reg_val;
 29
 30	dev = container_of(chip, struct adp5520_gpio, gpio_chip);
 31
 32	/*
 33	 * There are dedicated registers for GPIO IN/OUT.
 34	 * Make sure we return the right value, even when configured as output
 35	 */
 36
 37	if (test_bit(off, &dev->output))
 38		adp5520_read(dev->master, ADP5520_GPIO_OUT, &reg_val);
 39	else
 40		adp5520_read(dev->master, ADP5520_GPIO_IN, &reg_val);
 41
 42	return !!(reg_val & dev->lut[off]);
 43}
 44
 45static void adp5520_gpio_set_value(struct gpio_chip *chip,
 46		unsigned off, int val)
 47{
 48	struct adp5520_gpio *dev;
 49	dev = container_of(chip, struct adp5520_gpio, gpio_chip);
 50
 51	if (val)
 52		adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]);
 53	else
 54		adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]);
 55}
 56
 57static int adp5520_gpio_direction_input(struct gpio_chip *chip, unsigned off)
 58{
 59	struct adp5520_gpio *dev;
 60	dev = container_of(chip, struct adp5520_gpio, gpio_chip);
 61
 62	clear_bit(off, &dev->output);
 63
 64	return adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_2,
 65				dev->lut[off]);
 66}
 67
 68static int adp5520_gpio_direction_output(struct gpio_chip *chip,
 69		unsigned off, int val)
 70{
 71	struct adp5520_gpio *dev;
 72	int ret = 0;
 73	dev = container_of(chip, struct adp5520_gpio, gpio_chip);
 74
 75	set_bit(off, &dev->output);
 76
 77	if (val)
 78		ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_OUT,
 79					dev->lut[off]);
 80	else
 81		ret |= adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT,
 82					dev->lut[off]);
 83
 84	ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_2,
 85					dev->lut[off]);
 86
 87	return ret;
 88}
 89
 90static int __devinit adp5520_gpio_probe(struct platform_device *pdev)
 91{
 92	struct adp5520_gpio_platform_data *pdata = pdev->dev.platform_data;
 93	struct adp5520_gpio *dev;
 94	struct gpio_chip *gc;
 95	int ret, i, gpios;
 96	unsigned char ctl_mask = 0;
 97
 98	if (pdata == NULL) {
 99		dev_err(&pdev->dev, "missing platform data\n");
100		return -ENODEV;
101	}
102
103	if (pdev->id != ID_ADP5520) {
104		dev_err(&pdev->dev, "only ADP5520 supports GPIO\n");
105		return -ENODEV;
106	}
107
108	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
109	if (dev == NULL) {
110		dev_err(&pdev->dev, "failed to alloc memory\n");
111		return -ENOMEM;
112	}
113
114	dev->master = pdev->dev.parent;
115
116	for (gpios = 0, i = 0; i < ADP5520_MAXGPIOS; i++)
117		if (pdata->gpio_en_mask & (1 << i))
118			dev->lut[gpios++] = 1 << i;
119
120	if (gpios < 1) {
121		ret = -EINVAL;
122		goto err;
123	}
124
125	gc = &dev->gpio_chip;
126	gc->direction_input  = adp5520_gpio_direction_input;
127	gc->direction_output = adp5520_gpio_direction_output;
128	gc->get = adp5520_gpio_get_value;
129	gc->set = adp5520_gpio_set_value;
130	gc->can_sleep = 1;
131
132	gc->base = pdata->gpio_start;
133	gc->ngpio = gpios;
134	gc->label = pdev->name;
135	gc->owner = THIS_MODULE;
136
137	ret = adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_1,
138		pdata->gpio_en_mask);
139
140	if (pdata->gpio_en_mask & ADP5520_GPIO_C3)
141		ctl_mask |= ADP5520_C3_MODE;
142
143	if (pdata->gpio_en_mask & ADP5520_GPIO_R3)
144		ctl_mask |= ADP5520_R3_MODE;
145
146	if (ctl_mask)
147		ret = adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
148			ctl_mask);
149
150	ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
151		pdata->gpio_pullup_mask);
152
153	if (ret) {
154		dev_err(&pdev->dev, "failed to write\n");
155		goto err;
156	}
157
158	ret = gpiochip_add(&dev->gpio_chip);
159	if (ret)
160		goto err;
161
162	platform_set_drvdata(pdev, dev);
163	return 0;
164
165err:
166	kfree(dev);
167	return ret;
168}
169
170static int __devexit adp5520_gpio_remove(struct platform_device *pdev)
171{
172	struct adp5520_gpio *dev;
173	int ret;
174
175	dev = platform_get_drvdata(pdev);
176	ret = gpiochip_remove(&dev->gpio_chip);
177	if (ret) {
178		dev_err(&pdev->dev, "%s failed, %d\n",
179				"gpiochip_remove()", ret);
180		return ret;
181	}
182
183	kfree(dev);
184	return 0;
185}
186
187static struct platform_driver adp5520_gpio_driver = {
188	.driver	= {
189		.name	= "adp5520-gpio",
190		.owner	= THIS_MODULE,
191	},
192	.probe		= adp5520_gpio_probe,
193	.remove		= __devexit_p(adp5520_gpio_remove),
194};
195
196static int __init adp5520_gpio_init(void)
197{
198	return platform_driver_register(&adp5520_gpio_driver);
199}
200module_init(adp5520_gpio_init);
201
202static void __exit adp5520_gpio_exit(void)
203{
204	platform_driver_unregister(&adp5520_gpio_driver);
205}
206module_exit(adp5520_gpio_exit);
207
208MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
209MODULE_DESCRIPTION("GPIO ADP5520 Driver");
210MODULE_LICENSE("GPL");
211MODULE_ALIAS("platform:adp5520-gpio");

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * GPIO driver for Analog Devices ADP5520 MFD PMICs
  4 *
  5 * Copyright 2009 Analog Devices Inc.
 
 
  6 */
  7
  8#include <linux/module.h>
  9#include <linux/slab.h>
 10#include <linux/kernel.h>
 11#include <linux/init.h>
 12#include <linux/platform_device.h>
 13#include <linux/mfd/adp5520.h>
 14#include <linux/gpio/driver.h>
 
 15
 16struct adp5520_gpio {
 17	struct device *master;
 18	struct gpio_chip gpio_chip;
 19	unsigned char lut[ADP5520_MAXGPIOS];
 20	unsigned long output;
 21};
 22
 23static int adp5520_gpio_get_value(struct gpio_chip *chip, unsigned off)
 24{
 25	struct adp5520_gpio *dev;
 26	uint8_t reg_val;
 27
 28	dev = gpiochip_get_data(chip);
 29
 30	/*
 31	 * There are dedicated registers for GPIO IN/OUT.
 32	 * Make sure we return the right value, even when configured as output
 33	 */
 34
 35	if (test_bit(off, &dev->output))
 36		adp5520_read(dev->master, ADP5520_GPIO_OUT, &reg_val);
 37	else
 38		adp5520_read(dev->master, ADP5520_GPIO_IN, &reg_val);
 39
 40	return !!(reg_val & dev->lut[off]);
 41}
 42
 43static void adp5520_gpio_set_value(struct gpio_chip *chip,
 44		unsigned off, int val)
 45{
 46	struct adp5520_gpio *dev;
 47	dev = gpiochip_get_data(chip);
 48
 49	if (val)
 50		adp5520_set_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]);
 51	else
 52		adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT, dev->lut[off]);
 53}
 54
 55static int adp5520_gpio_direction_input(struct gpio_chip *chip, unsigned off)
 56{
 57	struct adp5520_gpio *dev;
 58	dev = gpiochip_get_data(chip);
 59
 60	clear_bit(off, &dev->output);
 61
 62	return adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_2,
 63				dev->lut[off]);
 64}
 65
 66static int adp5520_gpio_direction_output(struct gpio_chip *chip,
 67		unsigned off, int val)
 68{
 69	struct adp5520_gpio *dev;
 70	int ret = 0;
 71	dev = gpiochip_get_data(chip);
 72
 73	set_bit(off, &dev->output);
 74
 75	if (val)
 76		ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_OUT,
 77					dev->lut[off]);
 78	else
 79		ret |= adp5520_clr_bits(dev->master, ADP5520_GPIO_OUT,
 80					dev->lut[off]);
 81
 82	ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_CFG_2,
 83					dev->lut[off]);
 84
 85	return ret;
 86}
 87
 88static int adp5520_gpio_probe(struct platform_device *pdev)
 89{
 90	struct adp5520_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev);
 91	struct adp5520_gpio *dev;
 92	struct gpio_chip *gc;
 93	int ret, i, gpios;
 94	unsigned char ctl_mask = 0;
 95
 96	if (pdata == NULL) {
 97		dev_err(&pdev->dev, "missing platform data\n");
 98		return -ENODEV;
 99	}
100
101	if (pdev->id != ID_ADP5520) {
102		dev_err(&pdev->dev, "only ADP5520 supports GPIO\n");
103		return -ENODEV;
104	}
105
106	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
107	if (dev == NULL)
 
108		return -ENOMEM;
 
109
110	dev->master = pdev->dev.parent;
111
112	for (gpios = 0, i = 0; i < ADP5520_MAXGPIOS; i++)
113		if (pdata->gpio_en_mask & (1 << i))
114			dev->lut[gpios++] = 1 << i;
115
116	if (gpios < 1)
117		return -EINVAL;
 
 
118
119	gc = &dev->gpio_chip;
120	gc->direction_input  = adp5520_gpio_direction_input;
121	gc->direction_output = adp5520_gpio_direction_output;
122	gc->get = adp5520_gpio_get_value;
123	gc->set = adp5520_gpio_set_value;
124	gc->can_sleep = true;
125
126	gc->base = pdata->gpio_start;
127	gc->ngpio = gpios;
128	gc->label = pdev->name;
129	gc->owner = THIS_MODULE;
130
131	ret = adp5520_clr_bits(dev->master, ADP5520_GPIO_CFG_1,
132		pdata->gpio_en_mask);
133
134	if (pdata->gpio_en_mask & ADP5520_GPIO_C3)
135		ctl_mask |= ADP5520_C3_MODE;
136
137	if (pdata->gpio_en_mask & ADP5520_GPIO_R3)
138		ctl_mask |= ADP5520_R3_MODE;
139
140	if (ctl_mask)
141		ret = adp5520_set_bits(dev->master, ADP5520_LED_CONTROL,
142			ctl_mask);
143
144	ret |= adp5520_set_bits(dev->master, ADP5520_GPIO_PULLUP,
145		pdata->gpio_pullup_mask);
146
147	if (ret) {
148		dev_err(&pdev->dev, "failed to write\n");
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
149		return ret;
150	}
151
152	return devm_gpiochip_add_data(&pdev->dev, &dev->gpio_chip, dev);
 
153}
154
155static struct platform_driver adp5520_gpio_driver = {
156	.driver	= {
157		.name	= "adp5520-gpio",
 
158	},
159	.probe		= adp5520_gpio_probe,
 
160};
161
162module_platform_driver(adp5520_gpio_driver);
 
 
 
 
 
 
 
 
 
 
163
164MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
165MODULE_DESCRIPTION("GPIO ADP5520 Driver");
166MODULE_LICENSE("GPL");
167MODULE_ALIAS("platform:adp5520-gpio");