我的BeagleBone学习历程---Android驱动修改

ID:85681 · 发表于 2015-7-15 01:55

Beaglebone外围电路设计之驱动代码修改根据 TI Android ICS 4.0.3 DevKitV3.0.1 AM335x EMV-SK Sources 进行修改。

1 修改使支持beaglebone上的用户指示灯:

修改的源码位置： $HOME/rowboat-android/kernel/arch/arm/mach-omap2/board-am335xevm.c

找到：

static struct pinmux_configgpio_led_mux[] = {

{"gpmc_ad4.gpio1_4",OMAP_MUX_MODE7 | AM33XX_PIN_INPUT},

{"gpmc_ad5.gpio1_5",OMAP_MUX_MODE7 | AM33XX_PIN_INPUT},

{"gpmc_ad6.gpio1_6",OMAP_MUX_MODE7 | AM33XX_PIN_INPUT},

{"gpmc_ad7.gpio1_7",OMAP_MUX_MODE7 | AM33XX_PIN_INPUT},

{NULL, 0},

};

修改成：static struct pinmux_config gpio_led_mux[] = {
      {"gpmc_a5.gpio1_21", OMAP_MUX_MODE7 | AM33XX_PIN_INPUT},
      {"gpmc_a6.gpio1_22", OMAP_MUX_MODE7 | AM33XX_PIN_INPUT},
      {"gpmc_a7.gpio1_23", OMAP_MUX_MODE7 | AM33XX_PIN_INPUT},
      {"gpmc_a8.gpio1_24", OMAP_MUX_MODE7 | AM33XX_PIN_INPUT},
      {NULL, 0},
};

找到：
static struct gpio_led gpio_leds[] = {
      {
            .name                      = "am335x:EVM_SK:usr0",
            .gpio                      = GPIO_TO_PIN(1, 4),       /* D1 */
      },
      {
            .name                      = "am335x:EVM_SK:usr1",
            .gpio                      = GPIO_TO_PIN(1, 5),       /* D2 */
      },
      {
            .name                      = "am335x:EVM_SK:mmc0",
            .gpio                      = GPIO_TO_PIN(1, 7),       /* D3 */
            .default_trigger       = "mmc0",
      },
      {
            .name                      = "am335x:EVM_SK:heartbeat",
            .gpio                      = GPIO_TO_PIN(1, 6),       /* D4 */
            .default_trigger       = "heartbeat",
      },
};

修改成：
static struct gpio_led gpio_leds[] = {
      {
            .name                      = "am335x:EVM_SK:usr0",
            .gpio                      = GPIO_TO_PIN(1,21),       /* D1 */
      },
      {
            .name                      = "am335x:EVM_SK:usr1",
            .gpio                      = GPIO_TO_PIN(1, 22),       /* D2 */
      },
      {
            .name                      = "am335x:EVM_SK:mmc0",
            .gpio                      = GPIO_TO_PIN(1, 23),       /* D3 */
            .default_trigger       = "mmc0",
      },
      {
            .name                      = "am335x:EVM_SK:heartbeat",
            .gpio                      = GPIO_TO_PIN(1, 24),       /* D4 */
            .default_trigger       = "heartbeat",
      },
};

2 修改按键驱动
修改的源码位置： $HOME/rowboat-android/kernel/arch/arm/mach-omap2/board-am335xevm.c
如修改LEDS一样修改两个地方：
/* pinmux for gpio based key */
static struct pinmux_config gpio_keys_pin_mux[] = {
      {"gpmc_wait0.gpio0_30", OMAP_MUX_MODE7 | AM33XX_PIN_INPUT},
      {"gpmc_oen_ren.gpio2_3", OMAP_MUX_MODE7 | AM33XX_PIN_INPUT},
      {"gpmc_advn_ale.gpio2_2", OMAP_MUX_MODE7 | AM33XX_PIN_INPUT},
      {"gpmc_ben0_cle.gpio2_5", OMAP_MUX_MODE7 | AM33XX_PIN_INPUT},
      {NULL, 0},
};
/* Configure GPIOs for GPIO Keys */
static struct gpio_keys_button am335x_evm_gpio_buttons[] = {
      {
            .code                = BTN_0,
            .gpio                = GPIO_TO_PIN(2, 3),
            .desc                = "SW1",
      },
      {
            .code                = BTN_1,
            .gpio                = GPIO_TO_PIN(2, 2),
            .desc                = "SW2",
      },
      {
            .code                = BTN_2,
            .gpio                = GPIO_TO_PIN(0, 30),
            .desc                = "SW3",
            .wakeup                = 1,
      },
      {
            .code                = BTN_3,
            .gpio                = GPIO_TO_PIN(2, 5),
            .desc                = "SW4",
      },
};

注：修改成扩展板对应的按键管脚，驱动是读取高电平有效，如果是需要低电平有效，就在结构体中加入：active_low=1;
   驱动源码位于： $HOME/rowboat-android/kernel/arch/driver/input/gpio_keys.c

3 修改触摸屏驱动
修改的源码位置： $HOME/rowboat-android/kernel/arch/arm/mach-omap2/board-am335xevm.c
/* TSc controller */
static struct tsc_data am335x_touchscreen_data  = {
      .wires  = 4,
      .x_max = 0x0fff,
      .y_max = 0x0fff,
      .x_plate_resistance = 200,
};

注：.x_plate_resistance根据具体触摸屏修改。
修改的源码位于： $HOME/rowboat-android/kernel/arch/driver/input/touchscreen/ti_tscadc.c，其中的：
#ifdef CONFIG_MACH_AM335XEVM
/* Define Touch Screen Boundary Limits */
#define AM335X_TS_XMIN                0xA5
#define AM335X_TS_XMAX                0xFB0
#define AM335X_TS_YMIN                0xDC
#define AM335X_TS_YMAX                0xF43
#endif
根据触摸屏的具体情况修改。可根据校准生成文件修改。

4  7寸液晶屏驱动修改：
修改的源码位置： $HOME/rowboat-android/kernel/arch/arm/mach-omap2/board-am335xevm.c
1
static struct lcd_ctrl_config bone_lcd_cape_cfg = {
      &bone_lcd_cape_disp_panel,
      .ac_bias             = 255,
      .ac_bias_intrpt       = 0,
      .dma_burst_sz          = 16,
      .bpp                   = 16,
      .fdd                   = 0x80,
      .tft_alt_mode          = 0,
      .stn_565_mode          = 0,
      .mono_8bit_mode       = 0,
      .invert_line_clock    = 1,
      .invert_frm_clock    = 1,
      .sync_edge             = 0,
      .sync_ctrl             = 1,
      .raster_order          = 0,
};

注：实际需要参数根据液晶屏修改
2 增加一个da8xx_lcdc_platform_data：
struct da8xx_lcdc_platform_data my_lcd_pdata = {
      .manu_name             = "XXX",
      .controller_data       = &bone_lcd_cape_cfg,
      .type                      = "YYY",
};

注:XXX,YYY想写什么就写什么，关键是要与接下来的对应起来

3 修改static void bone_lcdc_init(int evm_id, int profile) 函数：
if (am33xx_register_lcdc(&TFC_S9700RTWV35TR_01B_bone_lcd_cape_pdata))
修改成：
if (am33xx_register_lcdc(&my_lcd_pdat))

接下来：
修改的源码位于： $HOME/rowboat-android/kernel/arch/driver/video/Da8xx-fb.c
在结构体
static struct da8xx_panel known_lcd_panels[] =  中添加成员：
      [5] = {
                     .name = "YYY",
                     .width = 800,
                     .height = 480,
                     .hfp = 40,
                     .hbp = 38,
                     .hsw = 48,
                     .vfp = 16,
                     .vbp =28,
                     .vsw = 3,
                     .pxl_clk = 30000000,
                     .invert_pxl_clk = 0,
            },

注：YYY与da8xx_lcdc_platform_data中的YYY要一致。

完成上述修改后，需要在
$HOME/rowboat-android/kernel/arch/arm/mach-omap2/board-am335xevm.c 中修改：
static struct evm_dev_cfg beaglebone_dev_cfg[] = {
      {tps65217_init,       DEV_ON_BASEBOARD, PROFILE_NONE},
      {mii1_init,       DEV_ON_BASEBOARD, PROFILE_NONE},
      {usb0_init,       DEV_ON_BASEBOARD, PROFILE_NONE},
      {usb1_init,       DEV_ON_BASEBOARD, PROFILE_NONE},
      {mmc0_init,       DEV_ON_BASEBOARD, PROFILE_NONE},
      {i2c2_init,       DEV_ON_BASEBOARD, PROFILE_NONE},
      {gpio_led_init,       DEV_ON_BASEBOARD, PROFILE_NONE},
      {gpio_keys_init,  DEV_ON_BASEBOARD,PROFILE_NONE},
      {bone_lcdc_init,DEV_ON_BASEBOARD, PROFILE_NONE},
      {lcd_cape_tsc_init,DEV_ON_BASEBOARD, PROFILE_NONE},
      {NULL, 0, 0},
};
修改后重新制作SD卡启动效果：

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我的BeagleBone学习历程---Android驱动修改

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