This source file includes following definitions.
- madera_gpio_get_direction
- madera_gpio_direction_in
- madera_gpio_get
- madera_gpio_direction_out
- madera_gpio_set
- madera_gpio_probe
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8 #include <linux/gpio/driver.h>
9 #include <linux/kernel.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12
13 #include <linux/mfd/madera/core.h>
14 #include <linux/mfd/madera/pdata.h>
15 #include <linux/mfd/madera/registers.h>
16
17 struct madera_gpio {
18 struct madera *madera;
19
20 struct gpio_chip gpio_chip;
21 };
22
23 static int madera_gpio_get_direction(struct gpio_chip *chip,
24 unsigned int offset)
25 {
26 struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
27 struct madera *madera = madera_gpio->madera;
28 unsigned int reg_offset = 2 * offset;
29 unsigned int val;
30 int ret;
31
32 ret = regmap_read(madera->regmap, MADERA_GPIO1_CTRL_2 + reg_offset,
33 &val);
34 if (ret < 0)
35 return ret;
36
37 return !!(val & MADERA_GP1_DIR_MASK);
38 }
39
40 static int madera_gpio_direction_in(struct gpio_chip *chip, unsigned int offset)
41 {
42 struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
43 struct madera *madera = madera_gpio->madera;
44 unsigned int reg_offset = 2 * offset;
45
46 return regmap_update_bits(madera->regmap,
47 MADERA_GPIO1_CTRL_2 + reg_offset,
48 MADERA_GP1_DIR_MASK, MADERA_GP1_DIR);
49 }
50
51 static int madera_gpio_get(struct gpio_chip *chip, unsigned int offset)
52 {
53 struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
54 struct madera *madera = madera_gpio->madera;
55 unsigned int reg_offset = 2 * offset;
56 unsigned int val;
57 int ret;
58
59 ret = regmap_read(madera->regmap, MADERA_GPIO1_CTRL_1 + reg_offset,
60 &val);
61 if (ret < 0)
62 return ret;
63
64 return !!(val & MADERA_GP1_LVL_MASK);
65 }
66
67 static int madera_gpio_direction_out(struct gpio_chip *chip,
68 unsigned int offset, int value)
69 {
70 struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
71 struct madera *madera = madera_gpio->madera;
72 unsigned int reg_offset = 2 * offset;
73 unsigned int reg_val = value ? MADERA_GP1_LVL : 0;
74 int ret;
75
76 ret = regmap_update_bits(madera->regmap,
77 MADERA_GPIO1_CTRL_2 + reg_offset,
78 MADERA_GP1_DIR_MASK, 0);
79 if (ret < 0)
80 return ret;
81
82 return regmap_update_bits(madera->regmap,
83 MADERA_GPIO1_CTRL_1 + reg_offset,
84 MADERA_GP1_LVL_MASK, reg_val);
85 }
86
87 static void madera_gpio_set(struct gpio_chip *chip, unsigned int offset,
88 int value)
89 {
90 struct madera_gpio *madera_gpio = gpiochip_get_data(chip);
91 struct madera *madera = madera_gpio->madera;
92 unsigned int reg_offset = 2 * offset;
93 unsigned int reg_val = value ? MADERA_GP1_LVL : 0;
94 int ret;
95
96 ret = regmap_update_bits(madera->regmap,
97 MADERA_GPIO1_CTRL_1 + reg_offset,
98 MADERA_GP1_LVL_MASK, reg_val);
99
100
101 if (ret)
102 dev_warn(madera->dev, "Failed to write to 0x%x (%d)\n",
103 MADERA_GPIO1_CTRL_1 + reg_offset, ret);
104 }
105
106 static const struct gpio_chip madera_gpio_chip = {
107 .label = "madera",
108 .owner = THIS_MODULE,
109 .request = gpiochip_generic_request,
110 .free = gpiochip_generic_free,
111 .get_direction = madera_gpio_get_direction,
112 .direction_input = madera_gpio_direction_in,
113 .get = madera_gpio_get,
114 .direction_output = madera_gpio_direction_out,
115 .set = madera_gpio_set,
116 .set_config = gpiochip_generic_config,
117 .can_sleep = true,
118 };
119
120 static int madera_gpio_probe(struct platform_device *pdev)
121 {
122 struct madera *madera = dev_get_drvdata(pdev->dev.parent);
123 struct madera_pdata *pdata = &madera->pdata;
124 struct madera_gpio *madera_gpio;
125 int ret;
126
127 madera_gpio = devm_kzalloc(&pdev->dev, sizeof(*madera_gpio),
128 GFP_KERNEL);
129 if (!madera_gpio)
130 return -ENOMEM;
131
132 madera_gpio->madera = madera;
133
134
135 madera_gpio->gpio_chip = madera_gpio_chip;
136 madera_gpio->gpio_chip.parent = pdev->dev.parent;
137
138 switch (madera->type) {
139 case CS47L15:
140 madera_gpio->gpio_chip.ngpio = CS47L15_NUM_GPIOS;
141 break;
142 case CS47L35:
143 madera_gpio->gpio_chip.ngpio = CS47L35_NUM_GPIOS;
144 break;
145 case CS47L85:
146 case WM1840:
147 madera_gpio->gpio_chip.ngpio = CS47L85_NUM_GPIOS;
148 break;
149 case CS47L90:
150 case CS47L91:
151 madera_gpio->gpio_chip.ngpio = CS47L90_NUM_GPIOS;
152 break;
153 case CS42L92:
154 case CS47L92:
155 case CS47L93:
156 madera_gpio->gpio_chip.ngpio = CS47L92_NUM_GPIOS;
157 break;
158 default:
159 dev_err(&pdev->dev, "Unknown chip variant %d\n", madera->type);
160 return -EINVAL;
161 }
162
163
164 if (pdata->gpio_base)
165 madera_gpio->gpio_chip.base = pdata->gpio_base;
166 else
167 madera_gpio->gpio_chip.base = -1;
168
169 ret = devm_gpiochip_add_data(&pdev->dev,
170 &madera_gpio->gpio_chip,
171 madera_gpio);
172 if (ret < 0) {
173 dev_dbg(&pdev->dev, "Could not register gpiochip, %d\n", ret);
174 return ret;
175 }
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185
186 ret = gpiochip_add_pin_range(&madera_gpio->gpio_chip, "madera-pinctrl",
187 0, 0, madera_gpio->gpio_chip.ngpio);
188 if (ret) {
189 dev_dbg(&pdev->dev, "Failed to add pin range (%d)\n", ret);
190 return ret;
191 }
192
193 return 0;
194 }
195
196 static struct platform_driver madera_gpio_driver = {
197 .driver = {
198 .name = "madera-gpio",
199 },
200 .probe = madera_gpio_probe,
201 };
202
203 module_platform_driver(madera_gpio_driver);
204
205 MODULE_SOFTDEP("pre: pinctrl-madera");
206 MODULE_DESCRIPTION("GPIO interface for Madera codecs");
207 MODULE_AUTHOR("Nariman Poushin <nariman@opensource.cirrus.com>");
208 MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
209 MODULE_LICENSE("GPL v2");
210 MODULE_ALIAS("platform:madera-gpio");