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79a9becd AC |
1 | #ifndef __LINUX_GPIO_DRIVER_H |
2 | #define __LINUX_GPIO_DRIVER_H | |
3 | ||
ff2b1359 | 4 | #include <linux/device.h> |
79a9becd | 5 | #include <linux/types.h> |
c9a9972b | 6 | #include <linux/module.h> |
14250520 LW |
7 | #include <linux/irq.h> |
8 | #include <linux/irqchip/chained_irq.h> | |
9 | #include <linux/irqdomain.h> | |
a0a8bcf4 | 10 | #include <linux/lockdep.h> |
964cb341 | 11 | #include <linux/pinctrl/pinctrl.h> |
0f4630f3 | 12 | #include <linux/kconfig.h> |
79a9becd | 13 | |
79a9becd | 14 | struct gpio_desc; |
c9a9972b AC |
15 | struct of_phandle_args; |
16 | struct device_node; | |
f3ed0b66 | 17 | struct seq_file; |
ff2b1359 | 18 | struct gpio_device; |
79a9becd | 19 | |
bb1e88cc AC |
20 | #ifdef CONFIG_GPIOLIB |
21 | ||
79a9becd AC |
22 | /** |
23 | * struct gpio_chip - abstract a GPIO controller | |
24 | * @label: for diagnostics | |
ff2b1359 | 25 | * @gpiodev: the internal state holder, opaque struct |
58383c78 | 26 | * @parent: optional parent device providing the GPIOs |
79a9becd | 27 | * @owner: helps prevent removal of modules exporting active GPIOs |
b08ea35a | 28 | * @data: per-instance data assigned by the driver |
79a9becd AC |
29 | * @request: optional hook for chip-specific activation, such as |
30 | * enabling module power and clock; may sleep | |
31 | * @free: optional hook for chip-specific deactivation, such as | |
32 | * disabling module power and clock; may sleep | |
33 | * @get_direction: returns direction for signal "offset", 0=out, 1=in, | |
34 | * (same as GPIOF_DIR_XXX), or negative error | |
35 | * @direction_input: configures signal "offset" as input, or returns error | |
36 | * @direction_output: configures signal "offset" as output, or returns error | |
60befd2e | 37 | * @get: returns value for signal "offset", 0=low, 1=high, or negative error |
79a9becd | 38 | * @set: assigns output value for signal "offset" |
5f424243 | 39 | * @set_multiple: assigns output values for multiple signals defined by "mask" |
79a9becd AC |
40 | * @set_debounce: optional hook for setting debounce time for specified gpio in |
41 | * interrupt triggered gpio chips | |
42 | * @to_irq: optional hook supporting non-static gpio_to_irq() mappings; | |
43 | * implementation may not sleep | |
44 | * @dbg_show: optional routine to show contents in debugfs; default code | |
45 | * will be used when this is omitted, but custom code can show extra | |
46 | * state (such as pullup/pulldown configuration). | |
af6c235d LW |
47 | * @base: identifies the first GPIO number handled by this chip; |
48 | * or, if negative during registration, requests dynamic ID allocation. | |
49 | * DEPRECATION: providing anything non-negative and nailing the base | |
30bb6fb3 | 50 | * offset of GPIO chips is deprecated. Please pass -1 as base to |
af6c235d LW |
51 | * let gpiolib select the chip base in all possible cases. We want to |
52 | * get rid of the static GPIO number space in the long run. | |
79a9becd AC |
53 | * @ngpio: the number of GPIOs handled by this controller; the last GPIO |
54 | * handled is (base + ngpio - 1). | |
79a9becd AC |
55 | * @names: if set, must be an array of strings to use as alternative |
56 | * names for the GPIOs in this chip. Any entry in the array | |
57 | * may be NULL if there is no alias for the GPIO, however the | |
58 | * array must be @ngpio entries long. A name can include a single printk | |
59 | * format specifier for an unsigned int. It is substituted by the actual | |
60 | * number of the gpio. | |
9fb1f39e | 61 | * @can_sleep: flag must be set iff get()/set() methods sleep, as they |
1c8732bb LW |
62 | * must while accessing GPIO expander chips over I2C or SPI. This |
63 | * implies that if the chip supports IRQs, these IRQs need to be threaded | |
64 | * as the chip access may sleep when e.g. reading out the IRQ status | |
65 | * registers. | |
295494af OP |
66 | * @irq_not_threaded: flag must be set if @can_sleep is set but the |
67 | * IRQs don't need to be threaded | |
0f4630f3 LW |
68 | * @read_reg: reader function for generic GPIO |
69 | * @write_reg: writer function for generic GPIO | |
70 | * @pin2mask: some generic GPIO controllers work with the big-endian bits | |
71 | * notation, e.g. in a 8-bits register, GPIO7 is the least significant | |
72 | * bit. This callback assigns the right bit mask. | |
73 | * @reg_dat: data (in) register for generic GPIO | |
74 | * @reg_set: output set register (out=high) for generic GPIO | |
75 | * @reg_clk: output clear register (out=low) for generic GPIO | |
76 | * @reg_dir: direction setting register for generic GPIO | |
77 | * @bgpio_bits: number of register bits used for a generic GPIO i.e. | |
78 | * <register width> * 8 | |
79 | * @bgpio_lock: used to lock chip->bgpio_data. Also, this is needed to keep | |
80 | * shadowed and real data registers writes together. | |
81 | * @bgpio_data: shadowed data register for generic GPIO to clear/set bits | |
82 | * safely. | |
83 | * @bgpio_dir: shadowed direction register for generic GPIO to clear/set | |
84 | * direction safely. | |
41d6bb4c GS |
85 | * @irqchip: GPIO IRQ chip impl, provided by GPIO driver |
86 | * @irqdomain: Interrupt translation domain; responsible for mapping | |
87 | * between GPIO hwirq number and linux irq number | |
88 | * @irq_base: first linux IRQ number assigned to GPIO IRQ chip (deprecated) | |
89 | * @irq_handler: the irq handler to use (often a predefined irq core function) | |
90 | * for GPIO IRQs, provided by GPIO driver | |
91 | * @irq_default_type: default IRQ triggering type applied during GPIO driver | |
92 | * initialization, provided by GPIO driver | |
93 | * @irq_parent: GPIO IRQ chip parent/bank linux irq number, | |
94 | * provided by GPIO driver | |
95 | * @lock_key: per GPIO IRQ chip lockdep class | |
79a9becd AC |
96 | * |
97 | * A gpio_chip can help platforms abstract various sources of GPIOs so | |
98 | * they can all be accessed through a common programing interface. | |
99 | * Example sources would be SOC controllers, FPGAs, multifunction | |
100 | * chips, dedicated GPIO expanders, and so on. | |
101 | * | |
102 | * Each chip controls a number of signals, identified in method calls | |
103 | * by "offset" values in the range 0..(@ngpio - 1). When those signals | |
104 | * are referenced through calls like gpio_get_value(gpio), the offset | |
105 | * is calculated by subtracting @base from the gpio number. | |
106 | */ | |
107 | struct gpio_chip { | |
108 | const char *label; | |
ff2b1359 | 109 | struct gpio_device *gpiodev; |
58383c78 | 110 | struct device *parent; |
79a9becd | 111 | struct module *owner; |
b08ea35a | 112 | void *data; |
79a9becd AC |
113 | |
114 | int (*request)(struct gpio_chip *chip, | |
115 | unsigned offset); | |
116 | void (*free)(struct gpio_chip *chip, | |
117 | unsigned offset); | |
118 | int (*get_direction)(struct gpio_chip *chip, | |
119 | unsigned offset); | |
120 | int (*direction_input)(struct gpio_chip *chip, | |
121 | unsigned offset); | |
122 | int (*direction_output)(struct gpio_chip *chip, | |
123 | unsigned offset, int value); | |
124 | int (*get)(struct gpio_chip *chip, | |
125 | unsigned offset); | |
126 | void (*set)(struct gpio_chip *chip, | |
127 | unsigned offset, int value); | |
5f424243 RI |
128 | void (*set_multiple)(struct gpio_chip *chip, |
129 | unsigned long *mask, | |
130 | unsigned long *bits); | |
79a9becd AC |
131 | int (*set_debounce)(struct gpio_chip *chip, |
132 | unsigned offset, | |
133 | unsigned debounce); | |
134 | ||
135 | int (*to_irq)(struct gpio_chip *chip, | |
136 | unsigned offset); | |
137 | ||
138 | void (*dbg_show)(struct seq_file *s, | |
139 | struct gpio_chip *chip); | |
140 | int base; | |
141 | u16 ngpio; | |
79a9becd | 142 | const char *const *names; |
9fb1f39e | 143 | bool can_sleep; |
295494af | 144 | bool irq_not_threaded; |
79a9becd | 145 | |
0f4630f3 LW |
146 | #if IS_ENABLED(CONFIG_GPIO_GENERIC) |
147 | unsigned long (*read_reg)(void __iomem *reg); | |
148 | void (*write_reg)(void __iomem *reg, unsigned long data); | |
149 | unsigned long (*pin2mask)(struct gpio_chip *gc, unsigned int pin); | |
150 | void __iomem *reg_dat; | |
151 | void __iomem *reg_set; | |
152 | void __iomem *reg_clr; | |
153 | void __iomem *reg_dir; | |
154 | int bgpio_bits; | |
155 | spinlock_t bgpio_lock; | |
156 | unsigned long bgpio_data; | |
157 | unsigned long bgpio_dir; | |
158 | #endif | |
159 | ||
14250520 LW |
160 | #ifdef CONFIG_GPIOLIB_IRQCHIP |
161 | /* | |
7d75a871 | 162 | * With CONFIG_GPIOLIB_IRQCHIP we get an irqchip inside the gpiolib |
14250520 LW |
163 | * to handle IRQs for most practical cases. |
164 | */ | |
165 | struct irq_chip *irqchip; | |
166 | struct irq_domain *irqdomain; | |
c3626fde | 167 | unsigned int irq_base; |
14250520 LW |
168 | irq_flow_handler_t irq_handler; |
169 | unsigned int irq_default_type; | |
25e4fe92 | 170 | int irq_parent; |
a0a8bcf4 | 171 | struct lock_class_key *lock_key; |
14250520 LW |
172 | #endif |
173 | ||
79a9becd AC |
174 | #if defined(CONFIG_OF_GPIO) |
175 | /* | |
176 | * If CONFIG_OF is enabled, then all GPIO controllers described in the | |
177 | * device tree automatically may have an OF translation | |
178 | */ | |
179 | struct device_node *of_node; | |
180 | int of_gpio_n_cells; | |
181 | int (*of_xlate)(struct gpio_chip *gc, | |
182 | const struct of_phandle_args *gpiospec, u32 *flags); | |
183 | #endif | |
79a9becd AC |
184 | }; |
185 | ||
186 | extern const char *gpiochip_is_requested(struct gpio_chip *chip, | |
187 | unsigned offset); | |
188 | ||
189 | /* add/remove chips */ | |
b08ea35a LW |
190 | extern int gpiochip_add_data(struct gpio_chip *chip, void *data); |
191 | static inline int gpiochip_add(struct gpio_chip *chip) | |
192 | { | |
193 | return gpiochip_add_data(chip, NULL); | |
194 | } | |
e1db1706 | 195 | extern void gpiochip_remove(struct gpio_chip *chip); |
79a9becd AC |
196 | extern struct gpio_chip *gpiochip_find(void *data, |
197 | int (*match)(struct gpio_chip *chip, void *data)); | |
198 | ||
199 | /* lock/unlock as IRQ */ | |
e3a2e878 AC |
200 | int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset); |
201 | void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset); | |
6cee3821 | 202 | bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset); |
79a9becd | 203 | |
b08ea35a LW |
204 | /* get driver data */ |
205 | static inline void *gpiochip_get_data(struct gpio_chip *chip) | |
206 | { | |
207 | return chip->data; | |
208 | } | |
209 | ||
bb1e88cc AC |
210 | struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc); |
211 | ||
0f4630f3 LW |
212 | struct bgpio_pdata { |
213 | const char *label; | |
214 | int base; | |
215 | int ngpio; | |
216 | }; | |
217 | ||
c474e348 AB |
218 | #if IS_ENABLED(CONFIG_GPIO_GENERIC) |
219 | ||
0f4630f3 LW |
220 | int bgpio_init(struct gpio_chip *gc, struct device *dev, |
221 | unsigned long sz, void __iomem *dat, void __iomem *set, | |
222 | void __iomem *clr, void __iomem *dirout, void __iomem *dirin, | |
223 | unsigned long flags); | |
224 | ||
225 | #define BGPIOF_BIG_ENDIAN BIT(0) | |
226 | #define BGPIOF_UNREADABLE_REG_SET BIT(1) /* reg_set is unreadable */ | |
227 | #define BGPIOF_UNREADABLE_REG_DIR BIT(2) /* reg_dir is unreadable */ | |
228 | #define BGPIOF_BIG_ENDIAN_BYTE_ORDER BIT(3) | |
229 | #define BGPIOF_READ_OUTPUT_REG_SET BIT(4) /* reg_set stores output value */ | |
230 | #define BGPIOF_NO_OUTPUT BIT(5) /* only input */ | |
231 | ||
232 | #endif | |
233 | ||
14250520 LW |
234 | #ifdef CONFIG_GPIOLIB_IRQCHIP |
235 | ||
236 | void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, | |
237 | struct irq_chip *irqchip, | |
238 | int parent_irq, | |
239 | irq_flow_handler_t parent_handler); | |
240 | ||
a0a8bcf4 GS |
241 | int _gpiochip_irqchip_add(struct gpio_chip *gpiochip, |
242 | struct irq_chip *irqchip, | |
243 | unsigned int first_irq, | |
244 | irq_flow_handler_t handler, | |
245 | unsigned int type, | |
246 | struct lock_class_key *lock_key); | |
247 | ||
248 | #ifdef CONFIG_LOCKDEP | |
249 | #define gpiochip_irqchip_add(...) \ | |
250 | ( \ | |
251 | ({ \ | |
252 | static struct lock_class_key _key; \ | |
253 | _gpiochip_irqchip_add(__VA_ARGS__, &_key); \ | |
254 | }) \ | |
255 | ) | |
256 | #else | |
257 | #define gpiochip_irqchip_add(...) \ | |
258 | _gpiochip_irqchip_add(__VA_ARGS__, NULL) | |
259 | #endif | |
14250520 | 260 | |
7d75a871 | 261 | #endif /* CONFIG_GPIOLIB_IRQCHIP */ |
14250520 | 262 | |
c771c2f4 JG |
263 | int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset); |
264 | void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset); | |
265 | ||
964cb341 LW |
266 | #ifdef CONFIG_PINCTRL |
267 | ||
268 | /** | |
269 | * struct gpio_pin_range - pin range controlled by a gpio chip | |
270 | * @head: list for maintaining set of pin ranges, used internally | |
271 | * @pctldev: pinctrl device which handles corresponding pins | |
272 | * @range: actual range of pins controlled by a gpio controller | |
273 | */ | |
274 | ||
275 | struct gpio_pin_range { | |
276 | struct list_head node; | |
277 | struct pinctrl_dev *pctldev; | |
278 | struct pinctrl_gpio_range range; | |
279 | }; | |
280 | ||
281 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, | |
282 | unsigned int gpio_offset, unsigned int pin_offset, | |
283 | unsigned int npins); | |
284 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
285 | struct pinctrl_dev *pctldev, | |
286 | unsigned int gpio_offset, const char *pin_group); | |
287 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip); | |
288 | ||
289 | #else | |
290 | ||
291 | static inline int | |
292 | gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, | |
293 | unsigned int gpio_offset, unsigned int pin_offset, | |
294 | unsigned int npins) | |
295 | { | |
296 | return 0; | |
297 | } | |
298 | static inline int | |
299 | gpiochip_add_pingroup_range(struct gpio_chip *chip, | |
300 | struct pinctrl_dev *pctldev, | |
301 | unsigned int gpio_offset, const char *pin_group) | |
302 | { | |
303 | return 0; | |
304 | } | |
305 | ||
306 | static inline void | |
307 | gpiochip_remove_pin_ranges(struct gpio_chip *chip) | |
308 | { | |
309 | } | |
310 | ||
311 | #endif /* CONFIG_PINCTRL */ | |
312 | ||
abdc08a3 AC |
313 | struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, |
314 | const char *label); | |
f7d4ad98 GR |
315 | void gpiochip_free_own_desc(struct gpio_desc *desc); |
316 | ||
bb1e88cc AC |
317 | #else /* CONFIG_GPIOLIB */ |
318 | ||
319 | static inline struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) | |
320 | { | |
321 | /* GPIO can never have been requested */ | |
322 | WARN_ON(1); | |
323 | return ERR_PTR(-ENODEV); | |
324 | } | |
325 | ||
326 | #endif /* CONFIG_GPIOLIB */ | |
327 | ||
79a9becd | 328 | #endif |