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板凳
楼主 |
发表于 2018-12-14 17:29:27
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我倒是知道需要编写驱动,主要问题还是地址的映射问题,就是在驱动里面如何来实现地址的调用,我看你们的LED驱动程序里面也没有相关的地址调用问题啊,如下列的你们提供的源码所示:0 ]. z# H9 ]& u1 O
#include <linux/module.h># Z: t) p' O, |$ e$ O
9 [, Z( o+ [: o" m( a#include <linux/kernel.h>& m8 G6 ?. V; w' M! o+ v% W
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#include <linux/types.h>8 E8 \) Z8 {$ K' i- D* T
" V1 w* c9 v) D; A" K, P( o5 p* v#include <linux/gpio.h>9 x. \: H1 Z* J
: v: k6 J; M: Y( G7 i3 w* g#include <linux/leds.h>" l3 N( g- s9 p5 j4 Q+ E1 G: y _
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#include <linux/platform_device.h>
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#include <asm/mach-types.h>; @" }3 ^5 f6 v$ ], E
- T5 v/ A+ y f: g; |* B#include <asm/mach/arch.h>
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1 x1 L) i) n) [7 b4 n/ T E7 M6 `. T#include <mach/da8xx.h># Y, Z$ W: c8 [8 j
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#include <mach/mux.h>; M V# @8 Q. `
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#define DA850_USER_LED0 GPIO_TO_PIN(0, 0). F- n/ G% D+ H- `
& h5 G; Y, F7 a) ~$ V" C! N' `$ F#define DA850_USER_LED1 GPIO_TO_PIN(0, 5); O" D& ?# s- V% Y( s" n' m
# K) ?: v3 d, `- n4 a- Y5 |6 F$ V#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)8 O0 C$ e. }! x* V; b$ o
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#define DA850_USER_LED3 GPIO_TO_PIN(0, 2). @: O6 c Q6 k4 s2 w5 \( w
; w, D# \5 I) t! g' ]8 @" O0 f: h#define DA850_USER_LED4 GPIO_TO_PIN(6,12)
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$ y7 R+ V7 P. Y2 v: K#define DA850_USER_LED5 GPIO_TO_PIN(6,13)
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/* assign the tl som board LED-GPIOs*/! S9 D( ~3 ~% {% X5 h
1 y$ D4 g+ f) v2 f* mstatic const short da850_evm_tl_user_led_pins[] = {
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( r N. k4 P9 t) O$ o7 u1 J /* These pins are definition at <mach/mux.h> file */
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8 m" _1 F' X9 C DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,DA850_GPIO6_12,DA850_GPIO6_13,. h) _# y) b" N$ \" x T1 z) u/ |: U
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static struct gpio_led da850_evm_tl_leds[] = {" ?6 |1 U* Y( h( t2 N6 ]7 x. a
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{
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% X4 o" y# I; ?2 I3 B .active_low = 0,, t" e* O' n0 ~, y; J
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.gpio = DA850_USER_LED0,7 n3 G5 J F$ b$ @' z
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.name = "user_led0",* F8 ?6 ^5 Y4 p/ w' m
& E2 W$ p2 E$ p* D) B .default_trigger = "default-on",
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6 F, b7 R. m- X2 P. s .active_low = 0,3 V d* Y' J+ I K6 X
3 @: W6 }" ]* C; ]4 Y! L* x .gpio = DA850_USER_LED1,* f( d5 N/ k& f' V$ a* I. }+ C
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.name = "user_led1",
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: E$ T6 |; d/ c! t" f8 y .default_trigger = "default-on",
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{
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8 y! Y ?5 U% D( i# q' w .active_low = 0,0 t' V: Y& i( J, X4 [+ B
, E4 h3 W" ?, E9 e2 l( n .gpio = DA850_USER_LED2,9 e! M9 n. l( g1 u! @1 i l
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.name = "user_led2",
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: D* r& J' s: _) ` .default_trigger = "default-on",; s8 o9 a$ F2 a. u$ b0 X( \0 _- l! O
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.active_low = 0,
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; g' W/ V& |0 k, ]) f) A3 V .gpio = DA850_USER_LED3,0 A& R# S1 S2 \3 ]
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.name = "user_led3",
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.default_trigger = "default-on",) q) y3 s" A& O9 L- |1 V# v
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.active_low = 0,& D$ s) r! V, d7 I- s0 C( t, M
5 P0 }4 s$ h+ R( i7 l | .gpio = DA850_USER_LED4,
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1 |. m i8 L, d- o1 f5 x .name = "user_led4",# G* l- x6 C V$ G/ N6 e
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.default_trigger = "default-on",
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{
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.active_low = 0,
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. W9 W! J6 y; ]8 c# H4 D [# Z* u .gpio = DA850_USER_LED5,
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2 {2 Z! j' D( J* s .name = "user_led5",4 B9 S! Q7 [, X7 b# b
' J( a& o5 d4 d+ v7 P0 G) x .default_trigger = "default-on",
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};# P& _8 p% U) s& V* x+ e
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static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {6 U" [" T/ V" W. f( K5 ^4 V
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.leds = da850_evm_tl_leds,
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.num_leds = ARRAY_SIZE(da850_evm_tl_leds),
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};$ W8 Z" K) T$ }& n
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static void led_dev_release(struct device *dev)
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{
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};
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static struct platform_device da850_evm_tl_leds_device = {
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.name = "leds-gpio",
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9 r8 d0 }* j4 Z) v0 ~; g' ~ .id = 1,0 {* n: D2 K$ ~7 C$ Z0 A9 `
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.dev = {, x* J4 v4 f% U/ h5 f" i1 u
8 I) G! |2 W5 W2 C .platform_data = &da850_evm_tl_leds_pdata,; G$ H0 ^9 }0 i9 a
: ~: S k, G# _$ l .release = led_dev_release,
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};" v; N' e$ U5 T' ?; ]+ b. W6 C
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8 E" M' `" H* j7 Istatic int __init led_platform_init(void): O( D8 p/ ^' i5 |# ?) F) w
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! z& ^& y3 W/ s* C: Y2 u7 Q( d. c int ret;: S- g1 F& |$ f- M& e' t! \
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#if 0) v/ O# [3 f6 R. z
8 W/ j+ q( o6 f' K* q m: K ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);% `5 w# e5 b% t2 d, a0 u
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pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
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"%d\n", ret);9 }9 ^# |8 q, N6 X( M/ u: ]. y
8 u8 @! ^, l& |#endif
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ret = platform_device_register(&da850_evm_tl_leds_device);' Q1 x& m2 ~* i8 n- T- }' _4 N1 Q+ l
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if (ret)
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pr_warning("Could not register som GPIO expander LEDS");+ s2 `" ?7 p0 f, }0 }
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printk(KERN_INFO "LED register sucessful!\n");
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return ret;
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}
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static void __exit led_platform_exit(void)
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, O: I: W n/ R+ ?3 Y platform_device_unregister(&da850_evm_tl_leds_device);4 J! Z' ]! u6 z4 Y/ I
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printk(KERN_INFO "LED unregister!\n");5 |3 H1 D' M8 u' z* y
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! v8 m# s/ ~! F W3 h9 \( E( m# c/ m( {module_init(led_platform_init);& |- X/ n) P- m8 J+ Z
- W5 Z/ Y7 m) W- P* V6 Q+ Tmodule_exit(led_platform_exit);, F& t; C6 f" }
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MODULE_DESCRIPTION("Led platform driver");
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MODULE_AUTHOR("Tronlong");
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MODULE_LICENSE("GPL"); |
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