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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * GPIO Driver for Dialog DA9052 PMICs.
4 *
5 * Copyright(c) 2011 Dialog Semiconductor Ltd.
6 *
7 * Author: David Dajun Chen <dchen@diasemi.com>
8 */
9#include <linux/module.h>
10#include <linux/fs.h>
11#include <linux/uaccess.h>
12#include <linux/platform_device.h>
13#include <linux/gpio/driver.h>
14#include <linux/syscalls.h>
15#include <linux/seq_file.h>
16
17#include <linux/mfd/da9052/da9052.h>
18#include <linux/mfd/da9052/reg.h>
19#include <linux/mfd/da9052/pdata.h>
20
21#define DA9052_INPUT 1
22#define DA9052_OUTPUT_OPENDRAIN 2
23#define DA9052_OUTPUT_PUSHPULL 3
24
25#define DA9052_SUPPLY_VDD_IO1 0
26
27#define DA9052_DEBOUNCING_OFF 0
28#define DA9052_DEBOUNCING_ON 1
29
30#define DA9052_OUTPUT_LOWLEVEL 0
31
32#define DA9052_ACTIVE_LOW 0
33#define DA9052_ACTIVE_HIGH 1
34
35#define DA9052_GPIO_MAX_PORTS_PER_REGISTER 8
36#define DA9052_GPIO_SHIFT_COUNT(no) (no%8)
37#define DA9052_GPIO_MASK_UPPER_NIBBLE 0xF0
38#define DA9052_GPIO_MASK_LOWER_NIBBLE 0x0F
39#define DA9052_GPIO_NIBBLE_SHIFT 4
40#define DA9052_IRQ_GPI0 16
41#define DA9052_GPIO_ODD_SHIFT 7
42#define DA9052_GPIO_EVEN_SHIFT 3
43
44struct da9052_gpio {
45 struct da9052 *da9052;
46 struct gpio_chip gp;
47};
48
49static unsigned char da9052_gpio_port_odd(unsigned offset)
50{
51 return offset % 2;
52}
53
54static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
55{
56 struct da9052_gpio *gpio = gpiochip_get_data(gc);
57 int da9052_port_direction = 0;
58 int ret;
59
60 ret = da9052_reg_read(gpio->da9052,
61 DA9052_GPIO_0_1_REG + (offset >> 1));
62 if (ret < 0)
63 return ret;
64
65 if (da9052_gpio_port_odd(offset)) {
66 da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
67 da9052_port_direction >>= 4;
68 } else {
69 da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
70 }
71
72 switch (da9052_port_direction) {
73 case DA9052_INPUT:
74 if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
75 ret = da9052_reg_read(gpio->da9052,
76 DA9052_STATUS_C_REG);
77 else
78 ret = da9052_reg_read(gpio->da9052,
79 DA9052_STATUS_D_REG);
80 if (ret < 0)
81 return ret;
82 return !!(ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)));
83 case DA9052_OUTPUT_PUSHPULL:
84 if (da9052_gpio_port_odd(offset))
85 return !!(ret & DA9052_GPIO_ODD_PORT_MODE);
86 else
87 return !!(ret & DA9052_GPIO_EVEN_PORT_MODE);
88 default:
89 return -EINVAL;
90 }
91}
92
93static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
94{
95 struct da9052_gpio *gpio = gpiochip_get_data(gc);
96 int ret;
97
98 if (da9052_gpio_port_odd(offset)) {
99 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
100 DA9052_GPIO_0_1_REG,
101 DA9052_GPIO_ODD_PORT_MODE,
102 value << DA9052_GPIO_ODD_SHIFT);
103 if (ret != 0)
104 dev_err(gpio->da9052->dev,
105 "Failed to updated gpio odd reg,%d",
106 ret);
107 } else {
108 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
109 DA9052_GPIO_0_1_REG,
110 DA9052_GPIO_EVEN_PORT_MODE,
111 value << DA9052_GPIO_EVEN_SHIFT);
112 if (ret != 0)
113 dev_err(gpio->da9052->dev,
114 "Failed to updated gpio even reg,%d",
115 ret);
116 }
117}
118
119static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
120{
121 struct da9052_gpio *gpio = gpiochip_get_data(gc);
122 unsigned char register_value;
123 int ret;
124
125 /* Format: function - 2 bits type - 1 bit mode - 1 bit */
126 register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
127 DA9052_DEBOUNCING_ON << 3;
128
129 if (da9052_gpio_port_odd(offset))
130 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
131 DA9052_GPIO_0_1_REG,
132 DA9052_GPIO_MASK_UPPER_NIBBLE,
133 (register_value <<
134 DA9052_GPIO_NIBBLE_SHIFT));
135 else
136 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
137 DA9052_GPIO_0_1_REG,
138 DA9052_GPIO_MASK_LOWER_NIBBLE,
139 register_value);
140
141 return ret;
142}
143
144static int da9052_gpio_direction_output(struct gpio_chip *gc,
145 unsigned offset, int value)
146{
147 struct da9052_gpio *gpio = gpiochip_get_data(gc);
148 unsigned char register_value;
149 int ret;
150
151 /* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
152 register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
153 value << 3;
154
155 if (da9052_gpio_port_odd(offset))
156 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
157 DA9052_GPIO_0_1_REG,
158 DA9052_GPIO_MASK_UPPER_NIBBLE,
159 (register_value <<
160 DA9052_GPIO_NIBBLE_SHIFT));
161 else
162 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
163 DA9052_GPIO_0_1_REG,
164 DA9052_GPIO_MASK_LOWER_NIBBLE,
165 register_value);
166
167 return ret;
168}
169
170static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
171{
172 struct da9052_gpio *gpio = gpiochip_get_data(gc);
173 struct da9052 *da9052 = gpio->da9052;
174
175 int irq;
176
177 irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset);
178
179 return irq;
180}
181
182static const struct gpio_chip reference_gp = {
183 .label = "da9052-gpio",
184 .owner = THIS_MODULE,
185 .get = da9052_gpio_get,
186 .set = da9052_gpio_set,
187 .direction_input = da9052_gpio_direction_input,
188 .direction_output = da9052_gpio_direction_output,
189 .to_irq = da9052_gpio_to_irq,
190 .can_sleep = true,
191 .ngpio = 16,
192 .base = -1,
193};
194
195static int da9052_gpio_probe(struct platform_device *pdev)
196{
197 struct da9052_gpio *gpio;
198 struct da9052_pdata *pdata;
199 int ret;
200
201 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
202 if (!gpio)
203 return -ENOMEM;
204
205 gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
206 pdata = dev_get_platdata(gpio->da9052->dev);
207
208 gpio->gp = reference_gp;
209 if (pdata && pdata->gpio_base)
210 gpio->gp.base = pdata->gpio_base;
211
212 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
213 if (ret < 0) {
214 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
215 return ret;
216 }
217
218 platform_set_drvdata(pdev, gpio);
219
220 return 0;
221}
222
223static struct platform_driver da9052_gpio_driver = {
224 .probe = da9052_gpio_probe,
225 .driver = {
226 .name = "da9052-gpio",
227 },
228};
229
230module_platform_driver(da9052_gpio_driver);
231
232MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
233MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
234MODULE_LICENSE("GPL");
235MODULE_ALIAS("platform:da9052-gpio");
1/*
2 * GPIO Driver for Dialog DA9052 PMICs.
3 *
4 * Copyright(c) 2011 Dialog Semiconductor Ltd.
5 *
6 * Author: David Dajun Chen <dchen@diasemi.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 */
14#include <linux/module.h>
15#include <linux/fs.h>
16#include <linux/uaccess.h>
17#include <linux/platform_device.h>
18#include <linux/gpio.h>
19#include <linux/syscalls.h>
20#include <linux/seq_file.h>
21
22#include <linux/mfd/da9052/da9052.h>
23#include <linux/mfd/da9052/reg.h>
24#include <linux/mfd/da9052/pdata.h>
25
26#define DA9052_INPUT 1
27#define DA9052_OUTPUT_OPENDRAIN 2
28#define DA9052_OUTPUT_PUSHPULL 3
29
30#define DA9052_SUPPLY_VDD_IO1 0
31
32#define DA9052_DEBOUNCING_OFF 0
33#define DA9052_DEBOUNCING_ON 1
34
35#define DA9052_OUTPUT_LOWLEVEL 0
36
37#define DA9052_ACTIVE_LOW 0
38#define DA9052_ACTIVE_HIGH 1
39
40#define DA9052_GPIO_MAX_PORTS_PER_REGISTER 8
41#define DA9052_GPIO_SHIFT_COUNT(no) (no%8)
42#define DA9052_GPIO_MASK_UPPER_NIBBLE 0xF0
43#define DA9052_GPIO_MASK_LOWER_NIBBLE 0x0F
44#define DA9052_GPIO_NIBBLE_SHIFT 4
45#define DA9052_IRQ_GPI0 16
46#define DA9052_GPIO_ODD_SHIFT 7
47#define DA9052_GPIO_EVEN_SHIFT 3
48
49struct da9052_gpio {
50 struct da9052 *da9052;
51 struct gpio_chip gp;
52};
53
54static unsigned char da9052_gpio_port_odd(unsigned offset)
55{
56 return offset % 2;
57}
58
59static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
60{
61 struct da9052_gpio *gpio = gpiochip_get_data(gc);
62 int da9052_port_direction = 0;
63 int ret;
64
65 ret = da9052_reg_read(gpio->da9052,
66 DA9052_GPIO_0_1_REG + (offset >> 1));
67 if (ret < 0)
68 return ret;
69
70 if (da9052_gpio_port_odd(offset)) {
71 da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
72 da9052_port_direction >>= 4;
73 } else {
74 da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
75 }
76
77 switch (da9052_port_direction) {
78 case DA9052_INPUT:
79 if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
80 ret = da9052_reg_read(gpio->da9052,
81 DA9052_STATUS_C_REG);
82 else
83 ret = da9052_reg_read(gpio->da9052,
84 DA9052_STATUS_D_REG);
85 if (ret < 0)
86 return ret;
87 return !!(ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)));
88 case DA9052_OUTPUT_PUSHPULL:
89 if (da9052_gpio_port_odd(offset))
90 return !!(ret & DA9052_GPIO_ODD_PORT_MODE);
91 else
92 return !!(ret & DA9052_GPIO_EVEN_PORT_MODE);
93 default:
94 return -EINVAL;
95 }
96}
97
98static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
99{
100 struct da9052_gpio *gpio = gpiochip_get_data(gc);
101 int ret;
102
103 if (da9052_gpio_port_odd(offset)) {
104 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
105 DA9052_GPIO_0_1_REG,
106 DA9052_GPIO_ODD_PORT_MODE,
107 value << DA9052_GPIO_ODD_SHIFT);
108 if (ret != 0)
109 dev_err(gpio->da9052->dev,
110 "Failed to updated gpio odd reg,%d",
111 ret);
112 } else {
113 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
114 DA9052_GPIO_0_1_REG,
115 DA9052_GPIO_EVEN_PORT_MODE,
116 value << DA9052_GPIO_EVEN_SHIFT);
117 if (ret != 0)
118 dev_err(gpio->da9052->dev,
119 "Failed to updated gpio even reg,%d",
120 ret);
121 }
122}
123
124static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
125{
126 struct da9052_gpio *gpio = gpiochip_get_data(gc);
127 unsigned char register_value;
128 int ret;
129
130 /* Format: function - 2 bits type - 1 bit mode - 1 bit */
131 register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
132 DA9052_DEBOUNCING_ON << 3;
133
134 if (da9052_gpio_port_odd(offset))
135 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
136 DA9052_GPIO_0_1_REG,
137 DA9052_GPIO_MASK_UPPER_NIBBLE,
138 (register_value <<
139 DA9052_GPIO_NIBBLE_SHIFT));
140 else
141 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
142 DA9052_GPIO_0_1_REG,
143 DA9052_GPIO_MASK_LOWER_NIBBLE,
144 register_value);
145
146 return ret;
147}
148
149static int da9052_gpio_direction_output(struct gpio_chip *gc,
150 unsigned offset, int value)
151{
152 struct da9052_gpio *gpio = gpiochip_get_data(gc);
153 unsigned char register_value;
154 int ret;
155
156 /* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
157 register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
158 value << 3;
159
160 if (da9052_gpio_port_odd(offset))
161 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
162 DA9052_GPIO_0_1_REG,
163 DA9052_GPIO_MASK_UPPER_NIBBLE,
164 (register_value <<
165 DA9052_GPIO_NIBBLE_SHIFT));
166 else
167 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
168 DA9052_GPIO_0_1_REG,
169 DA9052_GPIO_MASK_LOWER_NIBBLE,
170 register_value);
171
172 return ret;
173}
174
175static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
176{
177 struct da9052_gpio *gpio = gpiochip_get_data(gc);
178 struct da9052 *da9052 = gpio->da9052;
179
180 int irq;
181
182 irq = regmap_irq_get_virq(da9052->irq_data, DA9052_IRQ_GPI0 + offset);
183
184 return irq;
185}
186
187static struct gpio_chip reference_gp = {
188 .label = "da9052-gpio",
189 .owner = THIS_MODULE,
190 .get = da9052_gpio_get,
191 .set = da9052_gpio_set,
192 .direction_input = da9052_gpio_direction_input,
193 .direction_output = da9052_gpio_direction_output,
194 .to_irq = da9052_gpio_to_irq,
195 .can_sleep = true,
196 .ngpio = 16,
197 .base = -1,
198};
199
200static int da9052_gpio_probe(struct platform_device *pdev)
201{
202 struct da9052_gpio *gpio;
203 struct da9052_pdata *pdata;
204 int ret;
205
206 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
207 if (!gpio)
208 return -ENOMEM;
209
210 gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
211 pdata = dev_get_platdata(gpio->da9052->dev);
212
213 gpio->gp = reference_gp;
214 if (pdata && pdata->gpio_base)
215 gpio->gp.base = pdata->gpio_base;
216
217 ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio);
218 if (ret < 0) {
219 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
220 return ret;
221 }
222
223 platform_set_drvdata(pdev, gpio);
224
225 return 0;
226}
227
228static struct platform_driver da9052_gpio_driver = {
229 .probe = da9052_gpio_probe,
230 .driver = {
231 .name = "da9052-gpio",
232 },
233};
234
235module_platform_driver(da9052_gpio_driver);
236
237MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
238MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
239MODULE_LICENSE("GPL");
240MODULE_ALIAS("platform:da9052-gpio");