/* * V4L2 Driver for i.MX27/i.MX25 camera host * * Copyright (C) 2008, Sascha Hauer, Pengutronix * Copyright (C) 2010, Baruch Siach, Orex Computed Radiography * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_MACH_MX27 #include #endif #include #include #define MX2_CAM_DRV_NAME "mx2-camera" #define MX2_CAM_VERSION_CODE KERNEL_VERSION(0, 0, 5) #define MX2_CAM_DRIVER_DESCRIPTION "i.MX2x_Camera" /* reset values */ #define CSICR1_RESET_VAL 0x40000800 #define CSICR2_RESET_VAL 0x0 #define CSICR3_RESET_VAL 0x0 /* csi control reg 1 */ #define CSICR1_SWAP16_EN (1 << 31) #define CSICR1_EXT_VSYNC (1 << 30) #define CSICR1_EOF_INTEN (1 << 29) #define CSICR1_PRP_IF_EN (1 << 28) #define CSICR1_CCIR_MODE (1 << 27) #define CSICR1_COF_INTEN (1 << 26) #define CSICR1_SF_OR_INTEN (1 << 25) #define CSICR1_RF_OR_INTEN (1 << 24) #define CSICR1_STATFF_LEVEL (3 << 22) #define CSICR1_STATFF_INTEN (1 << 21) #define CSICR1_RXFF_LEVEL(l) (((l) & 3) << 19) /* MX27 */ #define CSICR1_FB2_DMA_INTEN (1 << 20) /* MX25 */ #define CSICR1_FB1_DMA_INTEN (1 << 19) /* MX25 */ #define CSICR1_RXFF_INTEN (1 << 18) #define CSICR1_SOF_POL (1 << 17) #define CSICR1_SOF_INTEN (1 << 16) #define CSICR1_MCLKDIV(d) (((d) & 0xF) << 12) #define CSICR1_HSYNC_POL (1 << 11) #define CSICR1_CCIR_EN (1 << 10) #define CSICR1_MCLKEN (1 << 9) #define CSICR1_FCC (1 << 8) #define CSICR1_PACK_DIR (1 << 7) #define CSICR1_CLR_STATFIFO (1 << 6) #define CSICR1_CLR_RXFIFO (1 << 5) #define CSICR1_GCLK_MODE (1 << 4) #define CSICR1_INV_DATA (1 << 3) #define CSICR1_INV_PCLK (1 << 2) #define CSICR1_REDGE (1 << 1) #define SHIFT_STATFF_LEVEL 22 #define SHIFT_RXFF_LEVEL 19 #define SHIFT_MCLKDIV 12 /* control reg 3 */ #define CSICR3_FRMCNT (0xFFFF << 16) #define CSICR3_FRMCNT_RST (1 << 15) #define CSICR3_DMA_REFLASH_RFF (1 << 14) #define CSICR3_DMA_REFLASH_SFF (1 << 13) #define CSICR3_DMA_REQ_EN_RFF (1 << 12) #define CSICR3_DMA_REQ_EN_SFF (1 << 11) #define CSICR3_RXFF_LEVEL(l) (((l) & 7) << 4) /* MX25 */ #define CSICR3_CSI_SUP (1 << 3) #define CSICR3_ZERO_PACK_EN (1 << 2) #define CSICR3_ECC_INT_EN (1 << 1) #define CSICR3_ECC_AUTO_EN (1 << 0) #define SHIFT_FRMCNT 16 /* csi status reg */ #define CSISR_SFF_OR_INT (1 << 25) #define CSISR_RFF_OR_INT (1 << 24) #define CSISR_STATFF_INT (1 << 21) #define CSISR_DMA_TSF_FB2_INT (1 << 20) /* MX25 */ #define CSISR_DMA_TSF_FB1_INT (1 << 19) /* MX25 */ #define CSISR_RXFF_INT (1 << 18) #define CSISR_EOF_INT (1 << 17) #define CSISR_SOF_INT (1 << 16) #define CSISR_F2_INT (1 << 15) #define CSISR_F1_INT (1 << 14) #define CSISR_COF_INT (1 << 13) #define CSISR_ECC_INT (1 << 1) #define CSISR_DRDY (1 << 0) #define CSICR1 0x00 #define CSICR2 0x04 #define CSISR (cpu_is_mx27() ? 0x08 : 0x18) #define CSISTATFIFO 0x0c #define CSIRFIFO 0x10 #define CSIRXCNT 0x14 #define CSICR3 (cpu_is_mx27() ? 0x1C : 0x08) #define CSIDMASA_STATFIFO 0x20 #define CSIDMATA_STATFIFO 0x24 #define CSIDMASA_FB1 0x28 #define CSIDMASA_FB2 0x2c #define CSIFBUF_PARA 0x30 #define CSIIMAG_PARA 0x34 /* EMMA PrP */ #define PRP_CNTL 0x00 #define PRP_INTR_CNTL 0x04 #define PRP_INTRSTATUS 0x08 #define PRP_SOURCE_Y_PTR 0x0c #define PRP_SOURCE_CB_PTR 0x10 #define PRP_SOURCE_CR_PTR 0x14 #define PRP_DEST_RGB1_PTR 0x18 #define PRP_DEST_RGB2_PTR 0x1c #define PRP_DEST_Y_PTR 0x20 #define PRP_DEST_CB_PTR 0x24 #define PRP_DEST_CR_PTR 0x28 #define PRP_SRC_FRAME_SIZE 0x2c #define PRP_DEST_CH1_LINE_STRIDE 0x30 #define PRP_SRC_PIXEL_FORMAT_CNTL 0x34 #define PRP_CH1_PIXEL_FORMAT_CNTL 0x38 #define PRP_CH1_OUT_IMAGE_SIZE 0x3c #define PRP_CH2_OUT_IMAGE_SIZE 0x40 #define PRP_SRC_LINE_STRIDE 0x44 #define PRP_CSC_COEF_012 0x48 #define PRP_CSC_COEF_345 0x4c #define PRP_CSC_COEF_678 0x50 #define PRP_CH1_RZ_HORI_COEF1 0x54 #define PRP_CH1_RZ_HORI_COEF2 0x58 #define PRP_CH1_RZ_HORI_VALID 0x5c #define PRP_CH1_RZ_VERT_COEF1 0x60 #define PRP_CH1_RZ_VERT_COEF2 0x64 #define PRP_CH1_RZ_VERT_VALID 0x68 #define PRP_CH2_RZ_HORI_COEF1 0x6c #define PRP_CH2_RZ_HORI_COEF2 0x70 #define PRP_CH2_RZ_HORI_VALID 0x74 #define PRP_CH2_RZ_VERT_COEF1 0x78 #define PRP_CH2_RZ_VERT_COEF2 0x7c #define PRP_CH2_RZ_VERT_VALID 0x80 #define PRP_CNTL_CH1EN (1 << 0) #define PRP_CNTL_CH2EN (1 << 1) #define PRP_CNTL_CSIEN (1 << 2) #define PRP_CNTL_DATA_IN_YUV420 (0 << 3) #define PRP_CNTL_DATA_IN_YUV422 (1 << 3) #define PRP_CNTL_DATA_IN_RGB16 (2 << 3) #define PRP_CNTL_DATA_IN_RGB32 (3 << 3) #define PRP_CNTL_CH1_OUT_RGB8 (0 << 5) #define PRP_CNTL_CH1_OUT_RGB16 (1 << 5) #define PRP_CNTL_CH1_OUT_RGB32 (2 << 5) #define PRP_CNTL_CH1_OUT_YUV422 (3 << 5) #define PRP_CNTL_CH2_OUT_YUV420 (0 << 7) #define PRP_CNTL_CH2_OUT_YUV422 (1 << 7) #define PRP_CNTL_CH2_OUT_YUV444 (2 << 7) #define PRP_CNTL_CH1_LEN (1 << 9) #define PRP_CNTL_CH2_LEN (1 << 10) #define PRP_CNTL_SKIP_FRAME (1 << 11) #define PRP_CNTL_SWRST (1 << 12) #define PRP_CNTL_CLKEN (1 << 13) #define PRP_CNTL_WEN (1 << 14) #define PRP_CNTL_CH1BYP (1 << 15) #define PRP_CNTL_IN_TSKIP(x) ((x) << 16) #define PRP_CNTL_CH1_TSKIP(x) ((x) << 19) #define PRP_CNTL_CH2_TSKIP(x) ((x) << 22) #define PRP_CNTL_INPUT_FIFO_LEVEL(x) ((x) << 25) #define PRP_CNTL_RZ_FIFO_LEVEL(x) ((x) << 27) #define PRP_CNTL_CH2B1EN (1 << 29) #define PRP_CNTL_CH2B2EN (1 << 30) #define PRP_CNTL_CH2FEN (1 << 31) /* IRQ Enable and status register */ #define PRP_INTR_RDERR (1 << 0) #define PRP_INTR_CH1WERR (1 << 1) #define PRP_INTR_CH2WERR (1 << 2) #define PRP_INTR_CH1FC (1 << 3) #define PRP_INTR_CH2FC (1 << 5) #define PRP_INTR_LBOVF (1 << 7) #define PRP_INTR_CH2OVF (1 << 8) #define mx27_camera_emma(pcdev) (cpu_is_mx27() && pcdev->use_emma) #define MAX_VIDEO_MEM 16 struct mx2_camera_dev { struct device *dev; struct soc_camera_host soc_host; struct soc_camera_device *icd; struct clk *clk_csi, *clk_emma; unsigned int irq_csi, irq_emma; void __iomem *base_csi, *base_emma; unsigned long base_dma; struct mx2_camera_platform_data *pdata; struct resource *res_csi, *res_emma; unsigned long platform_flags; struct list_head capture; struct list_head active_bufs; spinlock_t lock; int dma; struct mx2_buffer *active; struct mx2_buffer *fb1_active; struct mx2_buffer *fb2_active; int use_emma; u32 csicr1; void *discard_buffer; dma_addr_t discard_buffer_dma; size_t discard_size; }; /* buffer for one video frame */ struct mx2_buffer { /* common v4l buffer stuff -- must be first */ struct videobuf_buffer vb; enum v4l2_mbus_pixelcode code; int bufnum; }; static void mx2_camera_deactivate(struct mx2_camera_dev *pcdev) { unsigned long flags; clk_disable(pcdev->clk_csi); writel(0, pcdev->base_csi + CSICR1); if (mx27_camera_emma(pcdev)) { writel(0, pcdev->base_emma + PRP_CNTL); } else if (cpu_is_mx25()) { spin_lock_irqsave(&pcdev->lock, flags); pcdev->fb1_active = NULL; pcdev->fb2_active = NULL; writel(0, pcdev->base_csi + CSIDMASA_FB1); writel(0, pcdev->base_csi + CSIDMASA_FB2); spin_unlock_irqrestore(&pcdev->lock, flags); } } /* * The following two functions absolutely depend on the fact, that * there can be only one camera on mx2 camera sensor interface */ static int mx2_camera_add_device(struct soc_camera_device *icd) { struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); struct mx2_camera_dev *pcdev = ici->priv; int ret; u32 csicr1; if (pcdev->icd) return -EBUSY; ret = clk_enable(pcdev->clk_csi); if (ret < 0) return ret; csicr1 = CSICR1_MCLKEN; if (mx27_camera_emma(pcdev)) { csicr1 |= CSICR1_PRP_IF_EN | CSICR1_FCC | CSICR1_RXFF_LEVEL(0); } else if (cpu_is_mx27()) csicr1 |= CSICR1_SOF_INTEN | CSICR1_RXFF_LEVEL(2); pcdev->csicr1 = csicr1; writel(pcdev->csicr1, pcdev->base_csi + CSICR1); pcdev->icd = icd; dev_info(icd->dev.parent, "Camera driver attached to camera %d\n", icd->devnum); return 0; } static void mx2_camera_remove_device(struct soc_camera_device *icd) { struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); struct mx2_camera_dev *pcdev = ici->priv; BUG_ON(icd != pcdev->icd); dev_info(icd->dev.parent, "Camera driver detached from camera %d\n", icd->devnum); mx2_camera_deactivate(pcdev); if (pcdev->discard_buffer) { dma_free_coherent(ici->v4l2_dev.dev, pcdev->discard_size, pcdev->discard_buffer, pcdev->discard_buffer_dma); pcdev->discard_buffer = NULL; } pcdev->icd = NULL; } #ifdef CONFIG_MACH_MX27 static void mx27_camera_dma_enable(struct mx2_camera_dev *pcdev) { u32 tmp; imx_dma_enable(pcdev->dma); tmp = readl(pcdev->base_csi + CSICR1); tmp |= CSICR1_RF_OR_INTEN; writel(tmp, pcdev->base_csi + CSICR1); } static irqreturn_t mx27_camera_irq(int irq_csi, void *data) { struct mx2_camera_dev *pcdev = data; u32 status = readl(pcdev->base_csi + CSISR); if (status & CSISR_SOF_INT && pcdev->active) { u32 tmp; tmp = readl(pcdev->base_csi + CSICR1); writel(tmp | CSICR1_CLR_RXFIFO, pcdev->base_csi + CSICR1); mx27_camera_dma_enable(pcdev); } writel(CSISR_SOF_INT | CSISR_RFF_OR_INT, pcdev->base_csi + CSISR); return IRQ_HANDLED; } #else static irqreturn_t mx27_camera_irq(int irq_csi, void *data) { return IRQ_NONE; } #endif /* CONFIG_MACH_MX27 */ static void mx25_camera_frame_done(struct mx2_camera_dev *pcdev, int fb, int state) { struct videobuf_buffer *vb; struct mx2_buffer *buf; struct mx2_buffer **fb_active = fb == 1 ? &pcdev->fb1_active : &pcdev->fb2_active; u32 fb_reg = fb == 1 ? CSIDMASA_FB1 : CSIDMASA_FB2; unsigned long flags; spin_lock_irqsave(&pcdev->lock, flags); if (*fb_active == NULL) goto out; vb = &(*fb_active)->vb; dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, vb, vb->baddr, vb->bsize); vb->state = state; do_gettimeofday(&vb->ts); vb->field_count++; wake_up(&vb->done); if (list_empty(&pcdev->capture)) { buf = NULL; writel(0, pcdev->base_csi + fb_reg); } else { buf = list_entry(pcdev->capture.next, struct mx2_buffer, vb.queue); vb = &buf->vb; list_del(&vb->queue); vb->state = VIDEOBUF_ACTIVE; writel(videobuf_to_dma_contig(vb), pcdev->base_csi + fb_reg); } *fb_active = buf; out: spin_unlock_irqrestore(&pcdev->lock, flags); } static irqreturn_t mx25_camera_irq(int irq_csi, void *data) { struct mx2_camera_dev *pcdev = data; u32 status = readl(pcdev->base_csi + CSISR); if (status & CSISR_DMA_TSF_FB1_INT) mx25_camera_frame_done(pcdev, 1, VIDEOBUF_DONE); else if (status & CSISR_DMA_TSF_FB2_INT) mx25_camera_frame_done(pcdev, 2, VIDEOBUF_DONE); /* FIXME: handle CSISR_RFF_OR_INT */ writel(status, pcdev->base_csi + CSISR); return IRQ_HANDLED; } /* * Videobuf operations */ static int mx2_videobuf_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size) { struct soc_camera_device *icd = vq->priv_data; int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width, icd->current_fmt->host_fmt); dev_dbg(&icd->dev, "count=%d, size=%d\n", *count, *size); if (bytes_per_line < 0) return bytes_per_line; *size = bytes_per_line * icd->user_height; if (0 == *count) *count = 32; if (*size * *count > MAX_VIDEO_MEM * 1024 * 1024) *count = (MAX_VIDEO_MEM * 1024 * 1024) / *size; return 0; } static void free_buffer(struct videobuf_queue *vq, struct mx2_buffer *buf) { struct soc_camera_device *icd = vq->priv_data; struct videobuf_buffer *vb = &buf->vb; dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, vb, vb->baddr, vb->bsize); /* * This waits until this buffer is out of danger, i.e., until it is no * longer in STATE_QUEUED or STATE_ACTIVE */ videobuf_waiton(vq, vb, 0, 0); videobuf_dma_contig_free(vq, vb); dev_dbg(&icd->dev, "%s freed\n", __func__); vb->state = VIDEOBUF_NEEDS_INIT; } static int mx2_videobuf_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb, enum v4l2_field field) { struct soc_camera_device *icd = vq->priv_data; struct mx2_buffer *buf = container_of(vb, struct mx2_buffer, vb); int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width, icd->current_fmt->host_fmt); int ret = 0; dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, vb, vb->baddr, vb->bsize); if (bytes_per_line < 0) return bytes_per_line; #ifdef DEBUG /* * This can be useful if you want to see if we actually fill * the buffer with something */ memset((void *)vb->baddr, 0xaa, vb->bsize); #endif if (buf->code != icd->current_fmt->code || vb->width != icd->user_width || vb->height != icd->user_height || vb->field != field) { buf->code = icd->current_fmt->code; vb->width = icd->user_width; vb->height = icd->user_height; vb->field = field; vb->state = VIDEOBUF_NEEDS_INIT; } vb->size = bytes_per_line * vb->height; if (vb->baddr && vb->bsize < vb->size) { ret = -EINVAL; goto out; } if (vb->state == VIDEOBUF_NEEDS_INIT) { ret = videobuf_iolock(vq, vb, NULL); if (ret) goto fail; vb->state = VIDEOBUF_PREPARED; } return 0; fail: free_buffer(vq, buf); out: return ret; } static void mx2_videobuf_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb) { struct soc_camera_device *icd = vq->priv_data; struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); struct mx2_camera_dev *pcdev = ici->priv; struct mx2_buffer *buf = container_of(vb, struct mx2_buffer, vb); unsigned long flags; dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, vb, vb->baddr, vb->bsize); spin_lock_irqsave(&pcdev->lock, flags); vb->state = VIDEOBUF_QUEUED; list_add_tail(&vb->queue, &pcdev->capture); if (mx27_camera_emma(pcdev)) { goto out; #ifdef CONFIG_MACH_MX27 } else if (cpu_is_mx27()) { int ret; if (pcdev->active == NULL) { ret = imx_dma_setup_single(pcdev->dma, videobuf_to_dma_contig(vb), vb->size, (u32)pcdev->base_dma + 0x10, DMA_MODE_READ); if (ret) { vb->state = VIDEOBUF_ERROR; wake_up(&vb->done); goto out; } vb->state = VIDEOBUF_ACTIVE; pcdev->active = buf; } #endif } else { /* cpu_is_mx25() */ u32 csicr3, dma_inten = 0; if (pcdev->fb1_active == NULL) { writel(videobuf_to_dma_contig(vb), pcdev->base_csi + CSIDMASA_FB1); pcdev->fb1_active = buf; dma_inten = CSICR1_FB1_DMA_INTEN; } else if (pcdev->fb2_active == NULL) { writel(videobuf_to_dma_contig(vb), pcdev->base_csi + CSIDMASA_FB2); pcdev->fb2_active = buf; dma_inten = CSICR1_FB2_DMA_INTEN; } if (dma_inten) { list_del(&vb->queue); vb->state = VIDEOBUF_ACTIVE; csicr3 = readl(pcdev->base_csi + CSICR3); /* Reflash DMA */ writel(csicr3 | CSICR3_DMA_REFLASH_RFF, pcdev->base_csi + CSICR3); /* clear & enable interrupts */ writel(dma_inten, pcdev->base_csi + CSISR); pcdev->csicr1 |= dma_inten; writel(pcdev->csicr1, pcdev->base_csi + CSICR1); /* enable DMA */ csicr3 |= CSICR3_DMA_REQ_EN_RFF | CSICR3_RXFF_LEVEL(1); writel(csicr3, pcdev->base_csi + CSICR3); } } out: spin_unlock_irqrestore(&pcdev->lock, flags); } static void mx2_videobuf_release(struct videobuf_queue *vq, struct videobuf_buffer *vb) { struct soc_camera_device *icd = vq->priv_data; struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); struct mx2_camera_dev *pcdev = ici->priv; struct mx2_buffer *buf = container_of(vb, struct mx2_buffer, vb); unsigned long flags; #ifdef DEBUG dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, vb, vb->baddr, vb->bsize); switch (vb->state) { case VIDEOBUF_ACTIVE: dev_info(&icd->dev, "%s (active)\n", __func__); break; case VIDEOBUF_QUEUED: dev_info(&icd->dev, "%s (queued)\n", __func__); break; case VIDEOBUF_PREPARED: dev_info(&icd->dev, "%s (prepared)\n", __func__); break; default: dev_info(&icd->dev, "%s (unknown) %d\n", __func__, vb->state); break; } #endif /* * Terminate only queued but inactive buffers. Active buffers are * released when they become inactive after videobuf_waiton(). * * FIXME: implement forced termination of active buffers, so that the * user won't get stuck in an uninterruptible state. This requires a * specific handling for each of the three DMA types that this driver * supports. */ spin_lock_irqsave(&pcdev->lock, flags); if (vb->state == VIDEOBUF_QUEUED) { list_del(&vb->queue); vb->state = VIDEOBUF_ERROR; } spin_unlock_irqrestore(&pcdev->lock, flags); free_buffer(vq, buf); } static struct videobuf_queue_ops mx2_videobuf_ops = { .buf_setup = mx2_videobuf_setup, .buf_prepare = mx2_videobuf_prepare, .buf_queue = mx2_videobuf_queue, .buf_release = mx2_videobuf_release, }; static void mx2_camera_init_videobuf(struct videobuf_queue *q, struct soc_camera_device *icd) { struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); struct mx2_camera_dev *pcdev = ici->priv; videobuf_queue_dma_contig_init(q, &mx2_videobuf_ops, pcdev->dev, &pcdev->lock, V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE, sizeof(struct mx2_buffer), icd); } #define MX2_BUS_FLAGS (SOCAM_DATAWIDTH_8 | \ SOCAM_MASTER | \ SOCAM_VSYNC_ACTIVE_HIGH | \ SOCAM_VSYNC_ACTIVE_LOW | \ SOCAM_HSYNC_ACTIVE_HIGH | \ SOCAM_HSYNC_ACTIVE_LOW | \ SOCAM_PCLK_SAMPLE_RISING | \ SOCAM_PCLK_SAMPLE_FALLING | \ SOCAM_DATA_ACTIVE_HIGH | \ SOCAM_DATA_ACTIVE_LOW) static int mx27_camera_emma_prp_reset(struct mx2_camera_dev *pcdev) { u32 cntl; int count = 0; cntl = readl(pcdev->base_emma + PRP_CNTL); writel(PRP_CNTL_SWRST, pcdev->base_emma + PRP_CNTL); while (count++ < 100) { if (!(readl(pcdev->base_emma + PRP_CNTL) & PRP_CNTL_SWRST)) return 0; barrier(); udelay(1); } return -ETIMEDOUT; } static void mx27_camera_emma_buf_init(struct soc_camera_device *icd, int bytesperline) { struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); struct mx2_camera_dev *pcdev = ici->priv; writel(pcdev->discard_buffer_dma, pcdev->base_emma + PRP_DEST_RGB1_PTR); writel(pcdev->discard_buffer_dma, pcdev->base_emma + PRP_DEST_RGB2_PTR); /* * We only use the EMMA engine to get rid of the broken * DMA Engine. No color space consversion at the moment. * We set the incomming and outgoing pixelformat to an * 16 Bit wide format and adjust the bytesperline * accordingly. With this configuration the inputdata * will not be changed by the emma and could be any type * of 16 Bit Pixelformat. */ writel(PRP_CNTL_CH1EN | PRP_CNTL_CSIEN | PRP_CNTL_DATA_IN_RGB16 | PRP_CNTL_CH1_OUT_RGB16 | PRP_CNTL_CH1_LEN | PRP_CNTL_CH1BYP | PRP_CNTL_CH1_TSKIP(0) | PRP_CNTL_IN_TSKIP(0), pcdev->base_emma + PRP_CNTL); writel(((bytesperline >> 1) << 16) | icd->user_height, pcdev->base_emma + PRP_SRC_FRAME_SIZE); writel(((bytesperline >> 1) << 16) | icd->user_height, pcdev->base_emma + PRP_CH1_OUT_IMAGE_SIZE); writel(bytesperline, pcdev->base_emma + PRP_DEST_CH1_LINE_STRIDE); writel(0x2ca00565, /* RGB565 */ pcdev->base_emma + PRP_SRC_PIXEL_FORMAT_CNTL); writel(0x2ca00565, /* RGB565 */ pcdev->base_emma + PRP_CH1_PIXEL_FORMAT_CNTL); /* Enable interrupts */ writel(PRP_INTR_RDERR | PRP_INTR_CH1WERR | PRP_INTR_CH2WERR | PRP_INTR_CH1FC | PRP_INTR_CH2FC | PRP_INTR_LBOVF | PRP_INTR_CH2OVF, pcdev->base_emma + PRP_INTR_CNTL); } static int mx2_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt) { struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); struct mx2_camera_dev *pcdev = ici->priv; unsigned long camera_flags, common_flags; int ret = 0; int bytesperline; u32 csicr1 = pcdev->csicr1; camera_flags = icd->ops->query_bus_param(icd); common_flags = soc_camera_bus_param_compatible(camera_flags, MX2_BUS_FLAGS); if (!common_flags) return -EINVAL; if ((common_flags & SOCAM_HSYNC_ACTIVE_HIGH) && (common_flags & SOCAM_HSYNC_ACTIVE_LOW)) { if (pcdev->platform_flags & MX2_CAMERA_HSYNC_HIGH) common_flags &= ~SOCAM_HSYNC_ACTIVE_LOW; else common_flags &= ~SOCAM_HSYNC_ACTIVE_HIGH; } if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) && (common_flags & SOCAM_PCLK_SAMPLE_FALLING)) { if (pcdev->platform_flags & MX2_CAMERA_PCLK_SAMPLE_RISING) common_flags &= ~SOCAM_PCLK_SAMPLE_FALLING; else common_flags &= ~SOCAM_PCLK_SAMPLE_RISING; } ret = icd->ops->set_bus_param(icd, common_flags); if (ret < 0) return ret; if (common_flags & SOCAM_PCLK_SAMPLE_RISING) csicr1 |= CSICR1_REDGE; if (common_flags & SOCAM_PCLK_SAMPLE_FALLING) csicr1 |= CSICR1_INV_PCLK; if (common_flags & SOCAM_VSYNC_ACTIVE_HIGH) csicr1 |= CSICR1_SOF_POL; if (common_flags & SOCAM_HSYNC_ACTIVE_HIGH) csicr1 |= CSICR1_HSYNC_POL; if (pcdev->platform_flags & MX2_CAMERA_SWAP16) csicr1 |= CSICR1_SWAP16_EN; if (pcdev->platform_flags & MX2_CAMERA_EXT_VSYNC) csicr1 |= CSICR1_EXT_VSYNC; if (pcdev->platform_flags & MX2_CAMERA_CCIR) csicr1 |= CSICR1_CCIR_EN; if (pcdev->platform_flags & MX2_CAMERA_CCIR_INTERLACE) csicr1 |= CSICR1_CCIR_MODE; if (pcdev->platform_flags & MX2_CAMERA_GATED_CLOCK) csicr1 |= CSICR1_GCLK_MODE; if (pcdev->platform_flags & MX2_CAMERA_INV_DATA) csicr1 |= CSICR1_INV_DATA; if (pcdev->platform_flags & MX2_CAMERA_PACK_DIR_MSB) csicr1 |= CSICR1_PACK_DIR; pcdev->csicr1 = csicr1; bytesperline = soc_mbus_bytes_per_line(icd->user_width, icd->current_fmt->host_fmt); if (bytesperline < 0) return bytesperline; if (mx27_camera_emma(pcdev)) { ret = mx27_camera_emma_prp_reset(pcdev); if (ret) return ret; if (pcdev->discard_buffer) dma_free_coherent(ici->v4l2_dev.dev, pcdev->discard_size, pcdev->discard_buffer, pcdev->discard_buffer_dma); /* * I didn't manage to properly enable/disable the prp * on a per frame basis during running transfers, * thus we allocate a buffer here and use it to * discard frames when no buffer is available. * Feel free to work on this ;) */ pcdev->discard_size = icd->user_height * bytesperline; pcdev->discard_buffer = dma_alloc_coherent(ici->v4l2_dev.dev, pcdev->discard_size, &pcdev->discard_buffer_dma, GFP_KERNEL); if (!pcdev->discard_buffer) return -ENOMEM; mx27_camera_emma_buf_init(icd, bytesperline); } else if (cpu_is_mx25()) { writel((bytesperline * icd->user_height) >> 2, pcdev->base_csi + CSIRXCNT); writel((bytesperline << 16) | icd->user_height, pcdev->base_csi + CSIIMAG_PARA); } writel(pcdev->csicr1, pcdev->base_csi + CSICR1); return 0; } static int mx2_camera_set_crop(struct soc_camera_device *icd, struct v4l2_crop *a) { struct v4l2_rect *rect = &a->c; struct v4l2_subdev *sd = soc_camera_to_subdev(icd); struct v4l2_mbus_framefmt mf; int ret; soc_camera_limit_side(&rect->left, &rect->width, 0, 2, 4096); soc_camera_limit_side(&rect->top, &rect->height, 0, 2, 4096); ret = v4l2_subdev_call(sd, video, s_crop, a); if (ret < 0) return ret; /* The capture device might have changed its output */ ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf); if (ret < 0) return ret; dev_dbg(icd->dev.parent, "Sensor cropped %dx%d\n", mf.width, mf.height); icd->user_width = mf.width; icd->user_height = mf.height; return ret; } static int mx2_camera_set_fmt(struct soc_camera_device *icd, struct v4l2_format *f) { struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); struct mx2_camera_dev *pcdev = ici->priv; struct v4l2_subdev *sd = soc_camera_to_subdev(icd); const struct soc_camera_format_xlate *xlate; struct v4l2_pix_format *pix = &f->fmt.pix; struct v4l2_mbus_framefmt mf; int ret; xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat); if (!xlate) { dev_warn(icd->dev.parent, "Format %x not found\n", pix->pixelformat); return -EINVAL; } mf.width = pix->width; mf.height = pix->height; mf.field = pix->field; mf.colorspace = pix->colorspace; mf.code = xlate->code; ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf); if (ret < 0 && ret != -ENOIOCTLCMD) return ret; if (mf.code != xlate->code) return -EINVAL; pix->width = mf.width; pix->height = mf.height; pix->field = mf.field; pix->colorspace = mf.colorspace; icd->current_fmt = xlate; return 0; } static int mx2_camera_try_fmt(struct soc_camera_device *icd, struct v4l2_format *f) { struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); struct mx2_camera_dev *pcdev = ici->priv; struct v4l2_subdev *sd = soc_camera_to_subdev(icd); const struct soc_camera_format_xlate *xlate; struct v4l2_pix_format *pix = &f->fmt.pix; struct v4l2_mbus_framefmt mf; __u32 pixfmt = pix->pixelformat; unsigned int width_limit; int ret; xlate = soc_camera_xlate_by_fourcc(icd, pixfmt); if (pixfmt && !xlate) { dev_warn(icd->dev.parent, "Format %x not found\n", pixfmt); return -EINVAL; } /* FIXME: implement MX27 limits */ /* limit to MX25 hardware capabilities */ if (cpu_is_mx25()) { if (xlate->host_fmt->bits_per_sample <= 8) width_limit = 0xffff * 4; else width_limit = 0xffff * 2; /* CSIIMAG_PARA limit */ if (pix->width > width_limit) pix->width = width_limit; if (pix->height > 0xffff) pix->height = 0xffff; pix->bytesperline = soc_mbus_bytes_per_line(pix->width, xlate->host_fmt); if (pix->bytesperline < 0) return pix->bytesperline; pix->sizeimage = pix->height * pix->bytesperline; if (pix->sizeimage > (4 * 0x3ffff)) { /* CSIRXCNT limit */ dev_warn(icd->dev.parent, "Image size (%u) above limit\n", pix->sizeimage); return -EINVAL; } } /* limit to sensor capabilities */ mf.width = pix->width; mf.height = pix->height; mf.field = pix->field; mf.colorspace = pix->colorspace; mf.code = xlate->code; ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf); if (ret < 0) return ret; if (mf.field == V4L2_FIELD_ANY) mf.field = V4L2_FIELD_NONE; if (mf.field != V4L2_FIELD_NONE) { dev_err(icd->dev.parent, "Field type %d unsupported.\n", mf.field); return -EINVAL; } pix->width = mf.width; pix->height = mf.height; pix->field = mf.field; pix->colorspace = mf.colorspace; return 0; } static int mx2_camera_querycap(struct soc_camera_host *ici, struct v4l2_capability *cap) { /* cap->name is set by the friendly caller:-> */ strlcpy(cap->card, MX2_CAM_DRIVER_DESCRIPTION, sizeof(cap->card)); cap->version = MX2_CAM_VERSION_CODE; cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING; return 0; } static int mx2_camera_reqbufs(struct soc_camera_file *icf, struct v4l2_requestbuffers *p) { int i; for (i = 0; i < p->count; i++) { struct mx2_buffer *buf = container_of(icf->vb_vidq.bufs[i], struct mx2_buffer, vb); INIT_LIST_HEAD(&buf->vb.queue); } return 0; } #ifdef CONFIG_MACH_MX27 static void mx27_camera_frame_done(struct mx2_camera_dev *pcdev, int state) { struct videobuf_buffer *vb; struct mx2_buffer *buf; unsigned long flags; int ret; spin_lock_irqsave(&pcdev->lock, flags); if (!pcdev->active) { dev_err(pcdev->dev, "%s called with no active buffer!\n", __func__); goto out; } vb = &pcdev->active->vb; buf = container_of(vb, struct mx2_buffer, vb); WARN_ON(list_empty(&vb->queue)); dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, vb, vb->baddr, vb->bsize); /* _init is used to debug races, see comment in pxa_camera_reqbufs() */ list_del_init(&vb->queue); vb->state = state; do_gettimeofday(&vb->ts); vb->field_count++; wake_up(&vb->done); if (list_empty(&pcdev->capture)) { pcdev->active = NULL; goto out; } pcdev->active = list_entry(pcdev->capture.next, struct mx2_buffer, vb.queue); vb = &pcdev->active->vb; vb->state = VIDEOBUF_ACTIVE; ret = imx_dma_setup_single(pcdev->dma, videobuf_to_dma_contig(vb), vb->size, (u32)pcdev->base_dma + 0x10, DMA_MODE_READ); if (ret) { vb->state = VIDEOBUF_ERROR; pcdev->active = NULL; wake_up(&vb->done); } out: spin_unlock_irqrestore(&pcdev->lock, flags); } static void mx27_camera_dma_err_callback(int channel, void *data, int err) { struct mx2_camera_dev *pcdev = data; mx27_camera_frame_done(pcdev, VIDEOBUF_ERROR); } static void mx27_camera_dma_callback(int channel, void *data) { struct mx2_camera_dev *pcdev = data; mx27_camera_frame_done(pcdev, VIDEOBUF_DONE); } #define DMA_REQ_CSI_RX 31 /* FIXME: Add this to a resource */ static int __devinit mx27_camera_dma_init(struct platform_device *pdev, struct mx2_camera_dev *pcdev) { int err; pcdev->dma = imx_dma_request_by_prio("CSI RX DMA", DMA_PRIO_HIGH); if (pcdev->dma < 0) { dev_err(&pdev->dev, "%s failed to request DMA channel\n", __func__); return pcdev->dma; } err = imx_dma_setup_handlers(pcdev->dma, mx27_camera_dma_callback, mx27_camera_dma_err_callback, pcdev); if (err) { dev_err(&pdev->dev, "%s failed to set DMA callback\n", __func__); goto err_out; } err = imx_dma_config_channel(pcdev->dma, IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_FIFO, IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR, DMA_REQ_CSI_RX, 1); if (err) { dev_err(&pdev->dev, "%s failed to config DMA channel\n", __func__); goto err_out; } imx_dma_config_burstlen(pcdev->dma, 64); return 0; err_out: imx_dma_free(pcdev->dma); return err; } #endif /* CONFIG_MACH_MX27 */ static unsigned int mx2_camera_poll(struct file *file, poll_table *pt) { struct soc_camera_file *icf = file->private_data; return videobuf_poll_stream(file, &icf->vb_vidq, pt); } static struct soc_camera_host_ops mx2_soc_camera_host_ops = { .owner = THIS_MODULE, .add = mx2_camera_add_device, .remove = mx2_camera_remove_device, .set_fmt = mx2_camera_set_fmt, .set_crop = mx2_camera_set_crop, .try_fmt = mx2_camera_try_fmt, .init_videobuf = mx2_camera_init_videobuf, .reqbufs = mx2_camera_reqbufs, .poll = mx2_camera_poll, .querycap = mx2_camera_querycap, .set_bus_param = mx2_camera_set_bus_param, }; static void mx27_camera_frame_done_emma(struct mx2_camera_dev *pcdev, int bufnum, int state) { struct mx2_buffer *buf; struct videobuf_buffer *vb; unsigned long phys; if (!list_empty(&pcdev->active_bufs)) { buf = list_entry(pcdev->active_bufs.next, struct mx2_buffer, vb.queue); BUG_ON(buf->bufnum != bufnum); vb = &buf->vb; #ifdef DEBUG phys = videobuf_to_dma_contig(vb); if (readl(pcdev->base_emma + PRP_DEST_RGB1_PTR + 4 * bufnum) != phys) { dev_err(pcdev->dev, "%p != %p\n", phys, readl(pcdev->base_emma + PRP_DEST_RGB1_PTR + 4 * bufnum)); } #endif dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__, vb, vb->baddr, vb->bsize); list_del(&vb->queue); vb->state = state; do_gettimeofday(&vb->ts); vb->field_count++; wake_up(&vb->done); } if (list_empty(&pcdev->capture)) { writel(pcdev->discard_buffer_dma, pcdev->base_emma + PRP_DEST_RGB1_PTR + 4 * bufnum); return; } buf = list_entry(pcdev->capture.next, struct mx2_buffer, vb.queue); buf->bufnum = !bufnum; list_move_tail(pcdev->capture.next, &pcdev->active_bufs); vb = &buf->vb; vb->state = VIDEOBUF_ACTIVE; phys = videobuf_to_dma_contig(vb); writel(phys, pcdev->base_emma + PRP_DEST_RGB1_PTR + 4 * bufnum); } static irqreturn_t mx27_camera_emma_irq(int irq_emma, void *data) { struct mx2_camera_dev *pcdev = data; unsigned int status = readl(pcdev->base_emma + PRP_INTRSTATUS); struct mx2_buffer *buf; if (status & (1 << 7)) { /* overflow */ u32 cntl; /* * We only disable channel 1 here since this is the only * enabled channel * * FIXME: the correct DMA overflow handling should be resetting * the buffer, returning an error frame, and continuing with * the next one. */ cntl = readl(pcdev->base_emma + PRP_CNTL); writel(cntl & ~PRP_CNTL_CH1EN, pcdev->base_emma + PRP_CNTL); writel(cntl, pcdev->base_emma + PRP_CNTL); } if ((status & (3 << 5)) == (3 << 5) && !list_empty(&pcdev->active_bufs)) { /* * Both buffers have triggered, process the one we're expecting * to first */ buf = list_entry(pcdev->active_bufs.next, struct mx2_buffer, vb.queue); mx27_camera_frame_done_emma(pcdev, buf->bufnum, VIDEOBUF_DONE); status &= ~(1 << (6 - buf->bufnum)); /* mark processed */ } if (status & (1 << 6)) mx27_camera_frame_done_emma(pcdev, 0, VIDEOBUF_DONE); if (status & (1 << 5)) mx27_camera_frame_done_emma(pcdev, 1, VIDEOBUF_DONE); writel(status, pcdev->base_emma + PRP_INTRSTATUS); return IRQ_HANDLED; } static int __devinit mx27_camera_emma_init(struct mx2_camera_dev *pcdev) { struct resource *res_emma = pcdev->res_emma; int err = 0; if (!request_mem_region(res_emma->start, resource_size(res_emma), MX2_CAM_DRV_NAME)) { err = -EBUSY; goto out; } pcdev->base_emma = ioremap(res_emma->start, resource_size(res_emma)); if (!pcdev->base_emma) { err = -ENOMEM; goto exit_release; } err = request_irq(pcdev->irq_emma, mx27_camera_emma_irq, 0, MX2_CAM_DRV_NAME, pcdev); if (err) { dev_err(pcdev->dev, "Camera EMMA interrupt register failed \n"); goto exit_iounmap; } pcdev->clk_emma = clk_get(NULL, "emma"); if (IS_ERR(pcdev->clk_emma)) { err = PTR_ERR(pcdev->clk_emma); goto exit_free_irq; } clk_enable(pcdev->clk_emma); err = mx27_camera_emma_prp_reset(pcdev); if (err) goto exit_clk_emma_put; return err; exit_clk_emma_put: clk_disable(pcdev->clk_emma); clk_put(pcdev->clk_emma); exit_free_irq: free_irq(pcdev->irq_emma, pcdev); exit_iounmap: iounmap(pcdev->base_emma); exit_release: release_mem_region(res_emma->start, resource_size(res_emma)); out: return err; } static int __devinit mx2_camera_probe(struct platform_device *pdev) { struct mx2_camera_dev *pcdev; struct resource *res_csi, *res_emma; void __iomem *base_csi; int irq_csi, irq_emma; irq_handler_t mx2_cam_irq_handler = cpu_is_mx25() ? mx25_camera_irq : mx27_camera_irq; int err = 0; dev_dbg(&pdev->dev, "initialising\n"); res_csi = platform_get_resource(pdev, IORESOURCE_MEM, 0); irq_csi = platform_get_irq(pdev, 0); if (res_csi == NULL || irq_csi < 0) { dev_err(&pdev->dev, "Missing platform resources data\n"); err = -ENODEV; goto exit; } pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL); if (!pcdev) { dev_err(&pdev->dev, "Could not allocate pcdev\n"); err = -ENOMEM; goto exit; } pcdev->clk_csi = clk_get(&pdev->dev, NULL); if (IS_ERR(pcdev->clk_csi)) { err = PTR_ERR(pcdev->clk_csi); goto exit_kfree; } dev_dbg(&pdev->dev, "Camera clock frequency: %ld\n", clk_get_rate(pcdev->clk_csi)); /* Initialize DMA */ #ifdef CONFIG_MACH_MX27 if (cpu_is_mx27()) { err = mx27_camera_dma_init(pdev, pcdev); if (err) goto exit_clk_put; } #endif /* CONFIG_MACH_MX27 */ pcdev->res_csi = res_csi; pcdev->pdata = pdev->dev.platform_data; if (pcdev->pdata) { long rate; pcdev->platform_flags = pcdev->pdata->flags; rate = clk_round_rate(pcdev->clk_csi, pcdev->pdata->clk * 2); if (rate <= 0) { err = -ENODEV; goto exit_dma_free; } err = clk_set_rate(pcdev->clk_csi, rate); if (err < 0) goto exit_dma_free; } INIT_LIST_HEAD(&pcdev->capture); INIT_LIST_HEAD(&pcdev->active_bufs); spin_lock_init(&pcdev->lock); /* * Request the regions. */ if (!request_mem_region(res_csi->start, resource_size(res_csi), MX2_CAM_DRV_NAME)) { err = -EBUSY; goto exit_dma_free; } base_csi = ioremap(res_csi->start, resource_size(res_csi)); if (!base_csi) { err = -ENOMEM; goto exit_release; } pcdev->irq_csi = irq_csi; pcdev->base_csi = base_csi; pcdev->base_dma = res_csi->start; pcdev->dev = &pdev->dev; err = request_irq(pcdev->irq_csi, mx2_cam_irq_handler, 0, MX2_CAM_DRV_NAME, pcdev); if (err) { dev_err(pcdev->dev, "Camera interrupt register failed \n"); goto exit_iounmap; } if (cpu_is_mx27()) { /* EMMA support */ res_emma = platform_get_resource(pdev, IORESOURCE_MEM, 1); irq_emma = platform_get_irq(pdev, 1); if (res_emma && irq_emma >= 0) { dev_info(&pdev->dev, "Using EMMA\n"); pcdev->use_emma = 1; pcdev->res_emma = res_emma; pcdev->irq_emma = irq_emma; if (mx27_camera_emma_init(pcdev)) goto exit_free_irq; } } pcdev->soc_host.drv_name = MX2_CAM_DRV_NAME, pcdev->soc_host.ops = &mx2_soc_camera_host_ops, pcdev->soc_host.priv = pcdev; pcdev->soc_host.v4l2_dev.dev = &pdev->dev; pcdev->soc_host.nr = pdev->id; err = soc_camera_host_register(&pcdev->soc_host); if (err) goto exit_free_emma; return 0; exit_free_emma: if (mx27_camera_emma(pcdev)) { free_irq(pcdev->irq_emma, pcdev); clk_disable(pcdev->clk_emma); clk_put(pcdev->clk_emma); iounmap(pcdev->base_emma); release_mem_region(res_emma->start, resource_size(res_emma)); } exit_free_irq: free_irq(pcdev->irq_csi, pcdev); exit_iounmap: iounmap(base_csi); exit_release: release_mem_region(res_csi->start, resource_size(res_csi)); exit_dma_free: #ifdef CONFIG_MACH_MX27 if (cpu_is_mx27()) imx_dma_free(pcdev->dma); exit_clk_put: clk_put(pcdev->clk_csi); #endif /* CONFIG_MACH_MX27 */ exit_kfree: kfree(pcdev); exit: return err; } static int __devexit mx2_camera_remove(struct platform_device *pdev) { struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev); struct mx2_camera_dev *pcdev = container_of(soc_host, struct mx2_camera_dev, soc_host); struct resource *res; clk_put(pcdev->clk_csi); #ifdef CONFIG_MACH_MX27 if (cpu_is_mx27()) imx_dma_free(pcdev->dma); #endif /* CONFIG_MACH_MX27 */ free_irq(pcdev->irq_csi, pcdev); if (mx27_camera_emma(pcdev)) free_irq(pcdev->irq_emma, pcdev); soc_camera_host_unregister(&pcdev->soc_host); iounmap(pcdev->base_csi); if (mx27_camera_emma(pcdev)) { clk_disable(pcdev->clk_emma); clk_put(pcdev->clk_emma); iounmap(pcdev->base_emma); res = pcdev->res_emma; release_mem_region(res->start, resource_size(res)); } res = pcdev->res_csi; release_mem_region(res->start, resource_size(res)); kfree(pcdev); dev_info(&pdev->dev, "MX2 Camera driver unloaded\n"); return 0; } static struct platform_driver mx2_camera_driver = { .driver = { .name = MX2_CAM_DRV_NAME, }, .remove = __devexit_p(mx2_camera_remove), }; static int __init mx2_camera_init(void) { return platform_driver_probe(&mx2_camera_driver, &mx2_camera_probe); } static void __exit mx2_camera_exit(void) { return platform_driver_unregister(&mx2_camera_driver); } module_init(mx2_camera_init); module_exit(mx2_camera_exit); MODULE_DESCRIPTION("i.MX27/i.MX25 SoC Camera Host driver"); MODULE_AUTHOR("Sascha Hauer "); MODULE_LICENSE("GPL");