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板凳
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发表于 2018-12-14 17:29:27
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% R) [4 X/ n$ k. ]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:$ V( v+ h: s- S2 m$ T: F
#include <linux/module.h>' }! \$ P3 f1 ]
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#include <linux/kernel.h>
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' O% j9 j/ I+ o% u, V+ E1 }#include <linux/types.h>
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#include <linux/gpio.h>
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#include <linux/leds.h>
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#include <linux/platform_device.h>6 u3 N8 j( N# r9 y8 H& ?
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) Q( D# u0 b8 S8 H& ?" w h3 R#include <asm/mach-types.h>
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9 J4 E9 V j" v% @- ~' B#include <asm/mach/arch.h>
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#include <mach/da8xx.h>0 A+ R/ x, E& o3 h e7 u1 v
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#include <mach/mux.h>
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8 Y/ r( K; e) c, e, `! N8 n2 V H#define DA850_USER_LED0 GPIO_TO_PIN(0, 0)9 M" D, k# t- {- W% y8 _& d4 x
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#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)' [. Z3 O+ d( r4 l
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#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)$ L+ e2 p" J5 A2 h/ @1 E
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#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)
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. F6 v; h0 }7 o; {#define DA850_USER_LED4 GPIO_TO_PIN(6,12)* M8 G* g4 t" q/ I9 K8 s
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#define DA850_USER_LED5 GPIO_TO_PIN(6,13)
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8 D: P( M$ s# Y/* assign the tl som board LED-GPIOs*/4 A$ p' F0 H' h- o
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static const short da850_evm_tl_user_led_pins[] = {
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/* These pins are definition at <mach/mux.h> file */' d) R6 _2 {1 w- M
! T0 j o% ^6 A1 \0 ~ DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,DA850_GPIO6_12,DA850_GPIO6_13,
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};
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static struct gpio_led da850_evm_tl_leds[] = {
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.active_low = 0,5 `5 P$ C; i( F2 U2 L
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.gpio = DA850_USER_LED0,: P* |) W- J$ B2 O
$ L4 X4 L4 b9 E' K" G7 Q8 }0 P .name = "user_led0",
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.default_trigger = "default-on",
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},
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.active_low = 0,7 ]3 u* f' @6 B: p$ r- Z
& {+ x- Q. D, H; ^4 i5 a3 f$ z% m5 Q5 C. { .gpio = DA850_USER_LED1,
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8 h: y) L* e) `( c: C .name = "user_led1",6 v3 g. n; V4 v& z
) }/ h$ Y4 p+ i .default_trigger = "default-on",
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},
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.active_low = 0,
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.gpio = DA850_USER_LED2," U1 F& v e% Q9 p
# G+ a# q3 ^- @ .name = "user_led2",# w# ]& ^% a- Z
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.default_trigger = "default-on",0 t" W5 u( d1 W" I& w- J' Z
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},
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.active_low = 0,6 I8 [! L. E T6 |
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.gpio = DA850_USER_LED3,1 I5 u* q; Y8 [: X% m C3 L
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.default_trigger = "default-on",
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.active_low = 0,
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& ^" }( a2 E2 T1 j# V2 P .gpio = DA850_USER_LED4,1 ~! K1 p1 z3 Z( l
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.name = "user_led4",
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.default_trigger = "default-on", p3 T; z) [ _9 O( m# Q' H
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.active_low = 0,
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.gpio = DA850_USER_LED5,( f8 x8 W! R' Q4 `/ ?6 T( e5 W
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.name = "user_led5",& c; l) p- C/ S7 }, P
# p, r- L% }# I. V- K* F .default_trigger = "default-on",0 V6 r' x% Q9 I
& J2 @) s" x5 `8 Q# | },
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q3 E$ m& l1 t" Jstatic struct gpio_led_platform_data da850_evm_tl_leds_pdata = {( r% r3 |- O) y7 e/ b
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.leds = da850_evm_tl_leds,$ z8 @2 x; z5 m O: ]7 Y# q0 ?
0 C% o4 X! ?5 i, C" ]- s# c .num_leds = ARRAY_SIZE(da850_evm_tl_leds),) ?5 G1 S; S# a* \. i q
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};
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& L4 y' Y: ~8 Lstatic void led_dev_release(struct device *dev)$ D; L* F' M1 Y
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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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1 e% H9 Z/ Z5 A3 b$ n' h- V5 Q% y .id = 1,
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. J& w9 t! b- }2 Y .dev = {
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! o0 s0 ]" q+ d& V8 g .platform_data = &da850_evm_tl_leds_pdata,& X G# {& L( @4 r! {1 e
N% i1 Z6 r. T! o" K. \ .release = led_dev_release,
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};
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static int __init led_platform_init(void)" L, Q% D# v: g; z( \" y
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int ret;
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- B* _" d& j. r3 r2 c ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
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if (ret)
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5 D+ z+ I J. f pr_warning("da850_evm_tl_leds_init : User LED mux failed :"
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' P4 \" x/ M: A4 ]$ L "%d\n", ret);
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#endif
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ret = platform_device_register(&da850_evm_tl_leds_device);8 G% B1 N) j4 t2 z& ?# \
# v% w# S4 j% z) f" @1 W2 s0 q if (ret)
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pr_warning("Could not register som GPIO expander LEDS");
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printk(KERN_INFO "LED register sucessful!\n");7 M% h% P. |9 s
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return ret;2 k3 v, \+ v' t' L# w0 U g$ L
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static void __exit led_platform_exit(void)) _# Y4 I, } R8 V. D
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platform_device_unregister(&da850_evm_tl_leds_device);, T% L2 m1 ^. l8 l# R
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3 v! h' H1 q( N q printk(KERN_INFO "LED unregister!\n");
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}
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- z, R) t* H. W6 B8 f) F* m8 umodule_init(led_platform_init); E1 u4 u& y; U& e O! N: y$ t
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module_exit(led_platform_exit);& A* _& l |* H+ o' C4 `
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' K* F& \# ]. hMODULE_DESCRIPTION("Led platform driver");
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8 t! B t' T. N( U# T$ nMODULE_AUTHOR("Tronlong"); Y4 Y! l; v! H" y0 f4 B
7 Q% ^1 h% u8 s: L" tMODULE_LICENSE("GPL"); |
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