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1 | #ifndef __LINUX_GPIO_DRIVER_H |
2 | #define __LINUX_GPIO_DRIVER_H | |
3 | ||
4 | #include <linux/types.h> | |
c9a9972b | 5 | #include <linux/module.h> |
79a9becd AC |
6 | |
7 | struct device; | |
8 | struct gpio_desc; | |
c9a9972b AC |
9 | struct of_phandle_args; |
10 | struct device_node; | |
f3ed0b66 | 11 | struct seq_file; |
79a9becd AC |
12 | |
13 | /** | |
14 | * struct gpio_chip - abstract a GPIO controller | |
15 | * @label: for diagnostics | |
16 | * @dev: optional device providing the GPIOs | |
17 | * @owner: helps prevent removal of modules exporting active GPIOs | |
18 | * @list: links gpio_chips together for traversal | |
19 | * @request: optional hook for chip-specific activation, such as | |
20 | * enabling module power and clock; may sleep | |
21 | * @free: optional hook for chip-specific deactivation, such as | |
22 | * disabling module power and clock; may sleep | |
23 | * @get_direction: returns direction for signal "offset", 0=out, 1=in, | |
24 | * (same as GPIOF_DIR_XXX), or negative error | |
25 | * @direction_input: configures signal "offset" as input, or returns error | |
26 | * @direction_output: configures signal "offset" as output, or returns error | |
27 | * @get: returns value for signal "offset"; for output signals this | |
28 | * returns either the value actually sensed, or zero | |
29 | * @set: assigns output value for signal "offset" | |
30 | * @set_debounce: optional hook for setting debounce time for specified gpio in | |
31 | * interrupt triggered gpio chips | |
32 | * @to_irq: optional hook supporting non-static gpio_to_irq() mappings; | |
33 | * implementation may not sleep | |
34 | * @dbg_show: optional routine to show contents in debugfs; default code | |
35 | * will be used when this is omitted, but custom code can show extra | |
36 | * state (such as pullup/pulldown configuration). | |
37 | * @base: identifies the first GPIO number handled by this chip; or, if | |
38 | * negative during registration, requests dynamic ID allocation. | |
39 | * @ngpio: the number of GPIOs handled by this controller; the last GPIO | |
40 | * handled is (base + ngpio - 1). | |
41 | * @desc: array of ngpio descriptors. Private. | |
42 | * @can_sleep: flag must be set iff get()/set() methods sleep, as they | |
43 | * must while accessing GPIO expander chips over I2C or SPI | |
44 | * @names: if set, must be an array of strings to use as alternative | |
45 | * names for the GPIOs in this chip. Any entry in the array | |
46 | * may be NULL if there is no alias for the GPIO, however the | |
47 | * array must be @ngpio entries long. A name can include a single printk | |
48 | * format specifier for an unsigned int. It is substituted by the actual | |
49 | * number of the gpio. | |
50 | * | |
51 | * A gpio_chip can help platforms abstract various sources of GPIOs so | |
52 | * they can all be accessed through a common programing interface. | |
53 | * Example sources would be SOC controllers, FPGAs, multifunction | |
54 | * chips, dedicated GPIO expanders, and so on. | |
55 | * | |
56 | * Each chip controls a number of signals, identified in method calls | |
57 | * by "offset" values in the range 0..(@ngpio - 1). When those signals | |
58 | * are referenced through calls like gpio_get_value(gpio), the offset | |
59 | * is calculated by subtracting @base from the gpio number. | |
60 | */ | |
61 | struct gpio_chip { | |
62 | const char *label; | |
63 | struct device *dev; | |
64 | struct module *owner; | |
65 | struct list_head list; | |
66 | ||
67 | int (*request)(struct gpio_chip *chip, | |
68 | unsigned offset); | |
69 | void (*free)(struct gpio_chip *chip, | |
70 | unsigned offset); | |
71 | int (*get_direction)(struct gpio_chip *chip, | |
72 | unsigned offset); | |
73 | int (*direction_input)(struct gpio_chip *chip, | |
74 | unsigned offset); | |
75 | int (*direction_output)(struct gpio_chip *chip, | |
76 | unsigned offset, int value); | |
77 | int (*get)(struct gpio_chip *chip, | |
78 | unsigned offset); | |
79 | void (*set)(struct gpio_chip *chip, | |
80 | unsigned offset, int value); | |
81 | int (*set_debounce)(struct gpio_chip *chip, | |
82 | unsigned offset, | |
83 | unsigned debounce); | |
84 | ||
85 | int (*to_irq)(struct gpio_chip *chip, | |
86 | unsigned offset); | |
87 | ||
88 | void (*dbg_show)(struct seq_file *s, | |
89 | struct gpio_chip *chip); | |
90 | int base; | |
91 | u16 ngpio; | |
92 | struct gpio_desc *desc; | |
93 | const char *const *names; | |
94 | unsigned can_sleep:1; | |
95 | unsigned exported:1; | |
96 | ||
97 | #if defined(CONFIG_OF_GPIO) | |
98 | /* | |
99 | * If CONFIG_OF is enabled, then all GPIO controllers described in the | |
100 | * device tree automatically may have an OF translation | |
101 | */ | |
102 | struct device_node *of_node; | |
103 | int of_gpio_n_cells; | |
104 | int (*of_xlate)(struct gpio_chip *gc, | |
105 | const struct of_phandle_args *gpiospec, u32 *flags); | |
106 | #endif | |
107 | #ifdef CONFIG_PINCTRL | |
108 | /* | |
109 | * If CONFIG_PINCTRL is enabled, then gpio controllers can optionally | |
110 | * describe the actual pin range which they serve in an SoC. This | |
111 | * information would be used by pinctrl subsystem to configure | |
112 | * corresponding pins for gpio usage. | |
113 | */ | |
114 | struct list_head pin_ranges; | |
115 | #endif | |
116 | }; | |
117 | ||
118 | extern const char *gpiochip_is_requested(struct gpio_chip *chip, | |
119 | unsigned offset); | |
120 | ||
121 | /* add/remove chips */ | |
122 | extern int gpiochip_add(struct gpio_chip *chip); | |
123 | extern int __must_check gpiochip_remove(struct gpio_chip *chip); | |
124 | extern struct gpio_chip *gpiochip_find(void *data, | |
125 | int (*match)(struct gpio_chip *chip, void *data)); | |
126 | ||
127 | /* lock/unlock as IRQ */ | |
128 | int gpiod_lock_as_irq(struct gpio_desc *desc); | |
129 | void gpiod_unlock_as_irq(struct gpio_desc *desc); | |
130 | ||
53e7cac3 AC |
131 | enum gpio_lookup_flags { |
132 | GPIO_ACTIVE_HIGH = (0 << 0), | |
133 | GPIO_ACTIVE_LOW = (1 << 0), | |
134 | GPIO_OPEN_DRAIN = (1 << 1), | |
135 | GPIO_OPEN_SOURCE = (1 << 2), | |
136 | }; | |
137 | ||
bae48da2 AC |
138 | /** |
139 | * Lookup table for associating GPIOs to specific devices and functions using | |
140 | * platform data. | |
141 | */ | |
142 | struct gpiod_lookup { | |
143 | struct list_head list; | |
144 | /* | |
145 | * name of the chip the GPIO belongs to | |
146 | */ | |
147 | const char *chip_label; | |
148 | /* | |
149 | * hardware number (i.e. relative to the chip) of the GPIO | |
150 | */ | |
151 | u16 chip_hwnum; | |
152 | /* | |
153 | * name of device that can claim this GPIO | |
154 | */ | |
155 | const char *dev_id; | |
156 | /* | |
157 | * name of the GPIO from the device's point of view | |
158 | */ | |
159 | const char *con_id; | |
160 | /* | |
161 | * index of the GPIO in case several GPIOs share the same name | |
162 | */ | |
163 | unsigned int idx; | |
164 | /* | |
53e7cac3 | 165 | * mask of GPIO_* values |
bae48da2 | 166 | */ |
53e7cac3 | 167 | enum gpio_lookup_flags flags; |
bae48da2 AC |
168 | }; |
169 | ||
170 | /* | |
171 | * Simple definition of a single GPIO under a con_id | |
172 | */ | |
173 | #define GPIO_LOOKUP(_chip_label, _chip_hwnum, _dev_id, _con_id, _flags) \ | |
174 | GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _dev_id, _con_id, 0, _flags) | |
175 | ||
176 | /* | |
177 | * Use this macro if you need to have several GPIOs under the same con_id. | |
178 | * Each GPIO needs to use a different index and can be accessed using | |
179 | * gpiod_get_index() | |
180 | */ | |
181 | #define GPIO_LOOKUP_IDX(_chip_label, _chip_hwnum, _dev_id, _con_id, _idx, \ | |
182 | _flags) \ | |
183 | { \ | |
184 | .chip_label = _chip_label, \ | |
185 | .chip_hwnum = _chip_hwnum, \ | |
186 | .dev_id = _dev_id, \ | |
187 | .con_id = _con_id, \ | |
188 | .idx = _idx, \ | |
189 | .flags = _flags, \ | |
190 | } | |
191 | ||
192 | void gpiod_add_table(struct gpiod_lookup *table, size_t size); | |
193 | ||
79a9becd | 194 | #endif |