【正文】 基于高通MSM 8x60的I2C驅(qū)動(dòng)終極講解(1)(20120422 17:30)標(biāo)簽:轉(zhuǎn)載 分類：linux driver study原文地址：基于高通MSM 8x60的I2C驅(qū)動(dòng)終極講解(1)作者：shangbaogen網(wǎng)上的I2C驅(qū)動(dòng)講解已經(jīng)很多啦，我想不想畫蛇添足，我想寫一個(gè)完整的I2C驅(qū)動(dòng)，包括系統(tǒng)啟動(dòng)，總線注冊(cè)，驅(qū)動(dòng)注冊(cè)，設(shè)備注冊(cè)，里面會(huì)貫穿Linux設(shè)備驅(qū)動(dòng)模型，platform機(jī)制等等，基于高通MSM 8x60，I2C控制器為qup，下面開始進(jìn)入正題：首先是平臺(tái)設(shè)備的注冊(cè)：源碼位置：(msm/arch/arm/machmsm/)首先說下平臺(tái)設(shè)備，因?yàn)長(zhǎng)inux所有的設(shè)備都是通過總線控制器連接到CPU的，但是還有一些設(shè)備不是通過總線控制器連接到CPU，所以就有了platform總線虛擬總線，把那些不是真正通過總線控制器相連的設(shè)備，比如:SOC的片內(nèi)設(shè)備，片內(nèi)控制器，以便維護(hù)Linux設(shè)備模型中的，總線，設(shè)備，驅(qū)動(dòng)之間的關(guān)系。首先注冊(cè)BSP的平臺(tái)設(shè)備驅(qū)動(dòng)，其中I2C控制器的平臺(tái)設(shè)備如下：先看下高通的8x60，靠，有6個(gè)控制器，所有接下來的事情就是淡定。下面的是6個(gè)控制器在I2C控制器的ID編號(hào)define MSM_GSBI3_QUP_I2C_BUS_ID 0define MSM_GSBI4_QUP_I2C_BUS_ID 1define MSM_GSBI9_QUP_I2C_BUS_ID 2define MSM_GSBI8_QUP_I2C_BUS_ID 3define MSM_GSBI7_QUP_I2C_BUS_ID 4define MSM_GSBI12_QUP_I2C_BUS_ID 5下面是六個(gè)控制器所用到的資源static struct resource gsbi3_qup_i2c_resources[] = {{.name= qup_phys_addr,.start= MSM_GSBI3_QUP_PHYS,.end= MSM_GSBI3_QUP_PHYS + SZ_4K 1,.flags= IORESOURCE_MEM,},{.name= gsbi_qup_i2c_addr,.start= MSM_GSBI3_PHYS,.end= MSM_GSBI3_PHYS + 4 1,.flags= IORESOURCE_MEM,},{.name= qup_err_intr,.start= GSBI3_QUP_IRQ,.end= GSBI3_QUP_IRQ,.flags= IORESOURCE_IRQ,},}。static struct resource gsbi4_qup_i2c_resources[] = {{.name= qup_phys_addr,.start= MSM_GSBI4_QUP_PHYS,.end= MSM_GSBI4_QUP_PHYS + SZ_4K 1,.flags= IORESOURCE_MEM,},{.name= gsbi_qup_i2c_addr,.start= MSM_GSBI4_PHYS,.end= MSM_GSBI4_PHYS + 4 1,.flags= IORESOURCE_MEM,},{.name= qup_err_intr,.start= GSBI4_QUP_IRQ,.end= GSBI4_QUP_IRQ,.flags= IORESOURCE_IRQ,},}。static struct resource gsbi7_qup_i2c_resources[] = {{.name= qup_phys_addr,.start= MSM_GSBI7_QUP_PHYS,.end= MSM_GSBI7_QUP_PHYS + SZ_4K 1,.flags= IORESOURCE_MEM,},{.name= gsbi_qup_i2c_addr,.start= MSM_GSBI7_PHYS,.end= MSM_GSBI7_PHYS + 4 1,.flags= IORESOURCE_MEM,},{.name= qup_err_intr,.start= GSBI7_QUP_IRQ,.end= GSBI7_QUP_IRQ,.flags= IORESOURCE_IRQ,},}。static struct resource gsbi8_qup_i2c_resources[] = {{.name= qup_phys_addr,.start= MSM_GSBI8_QUP_PHYS,.end= MSM_GSBI8_QUP_PHYS + SZ_4K 1,.flags= IORESOURCE_MEM,},{.name= gsbi_qup_i2c_addr,.start= MSM_GSBI8_PHYS,.end= MSM_GSBI8_PHYS + 4 1,.flags= IORESOURCE_MEM,},{.name= qup_err_intr,.start= GSBI8_QUP_IRQ,.end= GSBI8_QUP_IRQ,.flags= IORESOURCE_IRQ,},}。static struct resource gsbi9_qup_i2c_resources[] = {{.name= qup_phys_addr,.start= MSM_GSBI9_QUP_PHYS,.end= MSM_GSBI9_QUP_PHYS + SZ_4K 1,.flags= IORESOURCE_MEM,},{.name= gsbi_qup_i2c_addr,.start= MSM_GSBI9_PHYS,.end= MSM_GSBI9_PHYS + 4 1,.flags= IORESOURCE_MEM,},{.name= qup_err_intr,.start= GSBI9_QUP_IRQ,.end= GSBI9_QUP_IRQ,.flags= IORESOURCE_IRQ,},}。static struct resource gsbi12_qup_i2c_resources[] = {{.name= qup_phys_addr,.start= MSM_GSBI12_QUP_PHYS,.end= MSM_GSBI12_QUP_PHYS + SZ_4K 1,.flags= IORESOURCE_MEM,},{.name= gsbi_qup_i2c_addr,.start= MSM_GSBI12_PHYS,.end= MSM_GSBI12_PHYS + 4 1,.flags= IORESOURCE_MEM,},{.name= qup_err_intr,.start= GSBI12_QUP_IRQ,.end= GSBI12_QUP_IRQ,.flags= IORESOURCE_IRQ,},}。下面是為6個(gè)I2C控制器所注冊(cè)平臺(tái)設(shè)備驅(qū)動(dòng)需要的結(jié)構(gòu)體/* Use GSBI3 QUP for /dev/i2c0 */struct platform_device msm_gsbi3_qup_i2c_device = {.name= qup_i2c,.id= MSM_GSBI3_QUP_I2C_BUS_ID,.num_resources= ARRAY_SIZE(gsbi3_qup_i2c_resources),.resource= gsbi3_qup_i2c_resources,}。/* Use GSBI4 QUP for /dev/i2c1 */struct platform_device msm_gsbi4_qup_i2c_device = {.name= qup_i2c,.id= MSM_GSBI4_QUP_I2C_BUS_ID,.num_resources= ARRAY_SIZE(gsbi4_qup_i2c_resources),.resource= gsbi4_qup_i2c_resources,}。/* Use GSBI8 QUP for /dev/i2c3 */struct platform_device msm_gsbi8_qup_i2c_device = {.name= qup_i2c,.id= MSM_GSBI8_QUP_I2C_BUS_ID,.num_resources= ARRAY_SIZE(gsbi8_qup_i2c_resources),.resource= gsbi8_qup_i2c_resources,}。/* Use GSBI9 QUP for /dev/i2c2 */struct platform_device msm_gsbi9_qup_i2c_device = {.name= qup_i2c,.id= MSM_GSBI9_QUP_I2C_BUS_ID,.num_resources= ARRAY_SIZE(gsbi9_qup_i2c_resources),.resource= gsbi9_qup_i2c_resources,}。/* Use GSBI7 QUP for /dev/i2c4 (Marimba) */struct platform_device msm_gsbi7_qup_i2c_device = {.name= qup_i2c,.id= MSM_GSBI7_QUP_I2C_BUS_ID,.num_resources= ARRAY_SIZE(gsbi7_qup_i2c_resources),.resource= gsbi7_qup_i2c_resources,}。/* Use GSBI12 QUP for /dev/i2c5 (Sensors) */struct platform_device msm_gsbi12_qup_i2c_device = {.name= qup_i2c,.id= MSM_GSBI12_QUP_I2C_BUS_ID,.num_resources= ARRAY_SIZE(gsbi12_qup_i2c_resources),.resource= gsbi12_qup_i2c_resources,}。注意該6個(gè)平臺(tái)設(shè)備結(jié)構(gòu)體的name都是qup_i2c,下面這些平臺(tái)設(shè)備將在BSP資源注冊(cè)的時(shí)候給添加到系統(tǒng)?；诟咄∕SM 8x60的I2C驅(qū)動(dòng)終極講解(2)(20120422 17:30)標(biāo)簽:轉(zhuǎn)載 分類：linux driver study原文地址：基于高通MSM 8x60的I2C驅(qū)動(dòng)終極講解(2)作者：shangbaogen上一篇文章已經(jīng)把I2C控制器所用的platform devices準(zhǔn)備好啦，現(xiàn)在開始注冊(cè)，該文件在板級(jí)支持文件中。static struct platform_device *surf_devices[] __initdata = {.........ifdef CONFIG_I2C_QUPamp。msm_gsbi3_qup_i2c_device,amp。msm_gsbi4_qup_i2c_device,amp。msm_gsbi7_qup_i2c_device,amp。msm_gsbi8_qup_i2c_device,amp。msm_gsbi9_qup_i2c_device,amp。msm_gsbi12_qup_i2c_device,endif........}。繼續(xù)對(duì)該I2C平臺(tái)設(shè)備結(jié)構(gòu)體初始化static void __initmsm8x60_init_buses(void){............ifdef CONFIG_I2C_QUP = amp。msm_gsbi3_qup_i2c_pdata。 = amp。msm_gsbi4_qup_i2c_pdata。 = amp。msm_gsbi7_qup_i2c_pdata。 =