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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 inline struct da9052_gpio *to_da9052_gpio(struct gpio_chip *chip)
55{
56 return container_of(chip, struct da9052_gpio, gp);
57}
58
59static unsigned char da9052_gpio_port_odd(unsigned offset)
60{
61 return offset % 2;
62}
63
64static int da9052_gpio_get(struct gpio_chip *gc, unsigned offset)
65{
66 struct da9052_gpio *gpio = to_da9052_gpio(gc);
67 int da9052_port_direction = 0;
68 int ret;
69
70 ret = da9052_reg_read(gpio->da9052,
71 DA9052_GPIO_0_1_REG + (offset >> 1));
72 if (ret < 0)
73 return ret;
74
75 if (da9052_gpio_port_odd(offset)) {
76 da9052_port_direction = ret & DA9052_GPIO_ODD_PORT_PIN;
77 da9052_port_direction >>= 4;
78 } else {
79 da9052_port_direction = ret & DA9052_GPIO_EVEN_PORT_PIN;
80 }
81
82 switch (da9052_port_direction) {
83 case DA9052_INPUT:
84 if (offset < DA9052_GPIO_MAX_PORTS_PER_REGISTER)
85 ret = da9052_reg_read(gpio->da9052,
86 DA9052_STATUS_C_REG);
87 else
88 ret = da9052_reg_read(gpio->da9052,
89 DA9052_STATUS_D_REG);
90 if (ret < 0)
91 return ret;
92 if (ret & (1 << DA9052_GPIO_SHIFT_COUNT(offset)))
93 return 1;
94 else
95 return 0;
96 case DA9052_OUTPUT_PUSHPULL:
97 if (da9052_gpio_port_odd(offset))
98 return ret & DA9052_GPIO_ODD_PORT_MODE;
99 else
100 return ret & DA9052_GPIO_EVEN_PORT_MODE;
101 default:
102 return -EINVAL;
103 }
104}
105
106static void da9052_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
107{
108 struct da9052_gpio *gpio = to_da9052_gpio(gc);
109 int ret;
110
111 if (da9052_gpio_port_odd(offset)) {
112 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
113 DA9052_GPIO_0_1_REG,
114 DA9052_GPIO_ODD_PORT_MODE,
115 value << DA9052_GPIO_ODD_SHIFT);
116 if (ret != 0)
117 dev_err(gpio->da9052->dev,
118 "Failed to updated gpio odd reg,%d",
119 ret);
120 } else {
121 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
122 DA9052_GPIO_0_1_REG,
123 DA9052_GPIO_EVEN_PORT_MODE,
124 value << DA9052_GPIO_EVEN_SHIFT);
125 if (ret != 0)
126 dev_err(gpio->da9052->dev,
127 "Failed to updated gpio even reg,%d",
128 ret);
129 }
130}
131
132static int da9052_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
133{
134 struct da9052_gpio *gpio = to_da9052_gpio(gc);
135 unsigned char register_value;
136 int ret;
137
138 /* Format: function - 2 bits type - 1 bit mode - 1 bit */
139 register_value = DA9052_INPUT | DA9052_ACTIVE_LOW << 2 |
140 DA9052_DEBOUNCING_ON << 3;
141
142 if (da9052_gpio_port_odd(offset))
143 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
144 DA9052_GPIO_0_1_REG,
145 DA9052_GPIO_MASK_UPPER_NIBBLE,
146 (register_value <<
147 DA9052_GPIO_NIBBLE_SHIFT));
148 else
149 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
150 DA9052_GPIO_0_1_REG,
151 DA9052_GPIO_MASK_LOWER_NIBBLE,
152 register_value);
153
154 return ret;
155}
156
157static int da9052_gpio_direction_output(struct gpio_chip *gc,
158 unsigned offset, int value)
159{
160 struct da9052_gpio *gpio = to_da9052_gpio(gc);
161 unsigned char register_value;
162 int ret;
163
164 /* Format: Function - 2 bits Type - 1 bit Mode - 1 bit */
165 register_value = DA9052_OUTPUT_PUSHPULL | DA9052_SUPPLY_VDD_IO1 << 2 |
166 value << 3;
167
168 if (da9052_gpio_port_odd(offset))
169 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
170 DA9052_GPIO_0_1_REG,
171 DA9052_GPIO_MASK_UPPER_NIBBLE,
172 (register_value <<
173 DA9052_GPIO_NIBBLE_SHIFT));
174 else
175 ret = da9052_reg_update(gpio->da9052, (offset >> 1) +
176 DA9052_GPIO_0_1_REG,
177 DA9052_GPIO_MASK_LOWER_NIBBLE,
178 register_value);
179
180 return ret;
181}
182
183static int da9052_gpio_to_irq(struct gpio_chip *gc, u32 offset)
184{
185 struct da9052_gpio *gpio = to_da9052_gpio(gc);
186 struct da9052 *da9052 = gpio->da9052;
187
188 return da9052->irq_base + DA9052_IRQ_GPI0 + offset;
189}
190
191static struct gpio_chip reference_gp __devinitdata = {
192 .label = "da9052-gpio",
193 .owner = THIS_MODULE,
194 .get = da9052_gpio_get,
195 .set = da9052_gpio_set,
196 .direction_input = da9052_gpio_direction_input,
197 .direction_output = da9052_gpio_direction_output,
198 .to_irq = da9052_gpio_to_irq,
199 .can_sleep = 1,
200 .ngpio = 16,
201 .base = -1,
202};
203
204static int __devinit da9052_gpio_probe(struct platform_device *pdev)
205{
206 struct da9052_gpio *gpio;
207 struct da9052_pdata *pdata;
208 int ret;
209
210 gpio = kzalloc(sizeof(*gpio), GFP_KERNEL);
211 if (gpio == NULL)
212 return -ENOMEM;
213
214 gpio->da9052 = dev_get_drvdata(pdev->dev.parent);
215 pdata = gpio->da9052->dev->platform_data;
216
217 gpio->gp = reference_gp;
218 if (pdata && pdata->gpio_base)
219 gpio->gp.base = pdata->gpio_base;
220
221 ret = gpiochip_add(&gpio->gp);
222 if (ret < 0) {
223 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
224 goto err_mem;
225 }
226
227 platform_set_drvdata(pdev, gpio);
228
229 return 0;
230
231err_mem:
232 kfree(gpio);
233 return ret;
234}
235
236static int __devexit da9052_gpio_remove(struct platform_device *pdev)
237{
238 struct da9052_gpio *gpio = platform_get_drvdata(pdev);
239 int ret;
240
241 ret = gpiochip_remove(&gpio->gp);
242 if (ret == 0)
243 kfree(gpio);
244
245 return ret;
246}
247
248static struct platform_driver da9052_gpio_driver = {
249 .probe = da9052_gpio_probe,
250 .remove = __devexit_p(da9052_gpio_remove),
251 .driver = {
252 .name = "da9052-gpio",
253 .owner = THIS_MODULE,
254 },
255};
256
257module_platform_driver(da9052_gpio_driver);
258
259MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
260MODULE_DESCRIPTION("DA9052 GPIO Device Driver");
261MODULE_LICENSE("GPL");
262MODULE_ALIAS("platform:da9052-gpio");
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");