diff options
Diffstat (limited to 'drivers/media/video/v4l2-common.c')
| -rw-r--r-- | drivers/media/video/v4l2-common.c | 623 |
1 files changed, 0 insertions, 623 deletions
diff --git a/drivers/media/video/v4l2-common.c b/drivers/media/video/v4l2-common.c deleted file mode 100644 index 1baec8393306..000000000000 --- a/drivers/media/video/v4l2-common.c +++ /dev/null @@ -1,623 +0,0 @@ -/* - * Video for Linux Two - * - * A generic video device interface for the LINUX operating system - * using a set of device structures/vectors for low level operations. - * - * This file replaces the videodev.c file that comes with the - * regular kernel distribution. - * - * 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. - * - * Author: Bill Dirks <bill@thedirks.org> - * based on code by Alan Cox, <alan@cymru.net> - * - */ - -/* - * Video capture interface for Linux - * - * A generic video device interface for the LINUX operating system - * using a set of device structures/vectors for low level operations. - * - * 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. - * - * Author: Alan Cox, <alan@lxorguk.ukuu.org.uk> - * - * Fixes: - */ - -/* - * Video4linux 1/2 integration by Justin Schoeman - * <justin@suntiger.ee.up.ac.za> - * 2.4 PROCFS support ported from 2.4 kernels by - * Iñaki García Etxebarria <garetxe@euskalnet.net> - * Makefile fix by "W. Michael Petullo" <mike@flyn.org> - * 2.4 devfs support ported from 2.4 kernels by - * Dan Merillat <dan@merillat.org> - * Added Gerd Knorrs v4l1 enhancements (Justin Schoeman) - */ - -#include <linux/module.h> -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/string.h> -#include <linux/errno.h> -#include <linux/i2c.h> -#if defined(CONFIG_SPI) -#include <linux/spi/spi.h> -#endif -#include <asm/uaccess.h> -#include <asm/pgtable.h> -#include <asm/io.h> -#include <asm/div64.h> -#include <media/v4l2-common.h> -#include <media/v4l2-device.h> -#include <media/v4l2-ctrls.h> -#include <media/v4l2-chip-ident.h> - -#include <linux/videodev2.h> - -MODULE_AUTHOR("Bill Dirks, Justin Schoeman, Gerd Knorr"); -MODULE_DESCRIPTION("misc helper functions for v4l2 device drivers"); -MODULE_LICENSE("GPL"); - -/* - * - * V 4 L 2 D R I V E R H E L P E R A P I - * - */ - -/* - * Video Standard Operations (contributed by Michael Schimek) - */ - -/* Helper functions for control handling */ - -/* Check for correctness of the ctrl's value based on the data from - struct v4l2_queryctrl and the available menu items. Note that - menu_items may be NULL, in that case it is ignored. */ -int v4l2_ctrl_check(struct v4l2_ext_control *ctrl, struct v4l2_queryctrl *qctrl, - const char * const *menu_items) -{ - if (qctrl->flags & V4L2_CTRL_FLAG_DISABLED) - return -EINVAL; - if (qctrl->flags & V4L2_CTRL_FLAG_GRABBED) - return -EBUSY; - if (qctrl->type == V4L2_CTRL_TYPE_STRING) - return 0; - if (qctrl->type == V4L2_CTRL_TYPE_BUTTON || - qctrl->type == V4L2_CTRL_TYPE_INTEGER64 || - qctrl->type == V4L2_CTRL_TYPE_CTRL_CLASS) - return 0; - if (ctrl->value < qctrl->minimum || ctrl->value > qctrl->maximum) - return -ERANGE; - if (qctrl->type == V4L2_CTRL_TYPE_MENU && menu_items != NULL) { - if (menu_items[ctrl->value] == NULL || - menu_items[ctrl->value][0] == '\0') - return -EINVAL; - } - if (qctrl->type == V4L2_CTRL_TYPE_BITMASK && - (ctrl->value & ~qctrl->maximum)) - return -ERANGE; - return 0; -} -EXPORT_SYMBOL(v4l2_ctrl_check); - -/* Fill in a struct v4l2_queryctrl */ -int v4l2_ctrl_query_fill(struct v4l2_queryctrl *qctrl, s32 min, s32 max, s32 step, s32 def) -{ - const char *name; - - v4l2_ctrl_fill(qctrl->id, &name, &qctrl->type, - &min, &max, &step, &def, &qctrl->flags); - - if (name == NULL) - return -EINVAL; - - qctrl->minimum = min; - qctrl->maximum = max; - qctrl->step = step; - qctrl->default_value = def; - qctrl->reserved[0] = qctrl->reserved[1] = 0; - strlcpy(qctrl->name, name, sizeof(qctrl->name)); - return 0; -} -EXPORT_SYMBOL(v4l2_ctrl_query_fill); - -/* Fill in a struct v4l2_querymenu based on the struct v4l2_queryctrl and - the menu. The qctrl pointer may be NULL, in which case it is ignored. - If menu_items is NULL, then the menu items are retrieved using - v4l2_ctrl_get_menu. */ -int v4l2_ctrl_query_menu(struct v4l2_querymenu *qmenu, struct v4l2_queryctrl *qctrl, - const char * const *menu_items) -{ - int i; - - qmenu->reserved = 0; - if (menu_items == NULL) - menu_items = v4l2_ctrl_get_menu(qmenu->id); - if (menu_items == NULL || - (qctrl && (qmenu->index < qctrl->minimum || qmenu->index > qctrl->maximum))) - return -EINVAL; - for (i = 0; i < qmenu->index && menu_items[i]; i++) ; - if (menu_items[i] == NULL || menu_items[i][0] == '\0') - return -EINVAL; - strlcpy(qmenu->name, menu_items[qmenu->index], sizeof(qmenu->name)); - return 0; -} -EXPORT_SYMBOL(v4l2_ctrl_query_menu); - -/* Fill in a struct v4l2_querymenu based on the specified array of valid - menu items (terminated by V4L2_CTRL_MENU_IDS_END). - Use this if there are 'holes' in the list of valid menu items. */ -int v4l2_ctrl_query_menu_valid_items(struct v4l2_querymenu *qmenu, const u32 *ids) -{ - const char * const *menu_items = v4l2_ctrl_get_menu(qmenu->id); - - qmenu->reserved = 0; - if (menu_items == NULL || ids == NULL) - return -EINVAL; - while (*ids != V4L2_CTRL_MENU_IDS_END) { - if (*ids++ == qmenu->index) { - strlcpy(qmenu->name, menu_items[qmenu->index], - sizeof(qmenu->name)); - return 0; - } - } - return -EINVAL; -} -EXPORT_SYMBOL(v4l2_ctrl_query_menu_valid_items); - -/* ctrl_classes points to an array of u32 pointers, the last element is - a NULL pointer. Each u32 array is a 0-terminated array of control IDs. - Each array must be sorted low to high and belong to the same control - class. The array of u32 pointers must also be sorted, from low class IDs - to high class IDs. - - This function returns the first ID that follows after the given ID. - When no more controls are available 0 is returned. */ -u32 v4l2_ctrl_next(const u32 * const * ctrl_classes, u32 id) -{ - u32 ctrl_class = V4L2_CTRL_ID2CLASS(id); - const u32 *pctrl; - - if (ctrl_classes == NULL) - return 0; - - /* if no query is desired, then check if the ID is part of ctrl_classes */ - if ((id & V4L2_CTRL_FLAG_NEXT_CTRL) == 0) { - /* find class */ - while (*ctrl_classes && V4L2_CTRL_ID2CLASS(**ctrl_classes) != ctrl_class) - ctrl_classes++; - if (*ctrl_classes == NULL) - return 0; - pctrl = *ctrl_classes; - /* find control ID */ - while (*pctrl && *pctrl != id) pctrl++; - return *pctrl ? id : 0; - } - id &= V4L2_CTRL_ID_MASK; - id++; /* select next control */ - /* find first class that matches (or is greater than) the class of - the ID */ - while (*ctrl_classes && V4L2_CTRL_ID2CLASS(**ctrl_classes) < ctrl_class) - ctrl_classes++; - /* no more classes */ - if (*ctrl_classes == NULL) - return 0; - pctrl = *ctrl_classes; - /* find first ctrl within the class that is >= ID */ - while (*pctrl && *pctrl < id) pctrl++; - if (*pctrl) - return *pctrl; - /* we are at the end of the controls of the current class. */ - /* continue with next class if available */ - ctrl_classes++; - if (*ctrl_classes == NULL) - return 0; - return **ctrl_classes; -} -EXPORT_SYMBOL(v4l2_ctrl_next); - -int v4l2_chip_match_host(const struct v4l2_dbg_match *match) -{ - switch (match->type) { - case V4L2_CHIP_MATCH_HOST: - return match->addr == 0; - default: - return 0; - } -} -EXPORT_SYMBOL(v4l2_chip_match_host); - -#if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE)) -int v4l2_chip_match_i2c_client(struct i2c_client *c, const struct v4l2_dbg_match *match) -{ - int len; - - if (c == NULL || match == NULL) - return 0; - - switch (match->type) { - case V4L2_CHIP_MATCH_I2C_DRIVER: - if (c->driver == NULL || c->driver->driver.name == NULL) - return 0; - len = strlen(c->driver->driver.name); - /* legacy drivers have a ' suffix, don't try to match that */ - if (len && c->driver->driver.name[len - 1] == '\'') - len--; - return len && !strncmp(c->driver->driver.name, match->name, len); - case V4L2_CHIP_MATCH_I2C_ADDR: - return c->addr == match->addr; - default: - return 0; - } -} -EXPORT_SYMBOL(v4l2_chip_match_i2c_client); - -int v4l2_chip_ident_i2c_client(struct i2c_client *c, struct v4l2_dbg_chip_ident *chip, - u32 ident, u32 revision) -{ - if (!v4l2_chip_match_i2c_client(c, &chip->match)) - return 0; - if (chip->ident == V4L2_IDENT_NONE) { - chip->ident = ident; - chip->revision = revision; - } - else { - chip->ident = V4L2_IDENT_AMBIGUOUS; - chip->revision = 0; - } - return 0; -} -EXPORT_SYMBOL(v4l2_chip_ident_i2c_client); - -/* ----------------------------------------------------------------- */ - -/* I2C Helper functions */ - - -void v4l2_i2c_subdev_init(struct v4l2_subdev *sd, struct i2c_client *client, - const struct v4l2_subdev_ops *ops) -{ - v4l2_subdev_init(sd, ops); - sd->flags |= V4L2_SUBDEV_FL_IS_I2C; - /* the owner is the same as the i2c_client's driver owner */ - sd->owner = client->driver->driver.owner; - /* i2c_client and v4l2_subdev point to one another */ - v4l2_set_subdevdata(sd, client); - i2c_set_clientdata(client, sd); - /* initialize name */ - snprintf(sd->name, sizeof(sd->name), "%s %d-%04x", - client->driver->driver.name, i2c_adapter_id(client->adapter), - client->addr); -} -EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_init); - - - -/* Load an i2c sub-device. */ -struct v4l2_subdev *v4l2_i2c_new_subdev_board(struct v4l2_device *v4l2_dev, - struct i2c_adapter *adapter, struct i2c_board_info *info, - const unsigned short *probe_addrs) -{ - struct v4l2_subdev *sd = NULL; - struct i2c_client *client; - - BUG_ON(!v4l2_dev); - - request_module(I2C_MODULE_PREFIX "%s", info->type); - - /* Create the i2c client */ - if (info->addr == 0 && probe_addrs) - client = i2c_new_probed_device(adapter, info, probe_addrs, - NULL); - else - client = i2c_new_device(adapter, info); - - /* Note: by loading the module first we are certain that c->driver - will be set if the driver was found. If the module was not loaded - first, then the i2c core tries to delay-load the module for us, - and then c->driver is still NULL until the module is finally - loaded. This delay-load mechanism doesn't work if other drivers - want to use the i2c device, so explicitly loading the module - is the best alternative. */ - if (client == NULL || client->driver == NULL) - goto error; - - /* Lock the module so we can safely get the v4l2_subdev pointer */ - if (!try_module_get(client->driver->driver.owner)) - goto error; - sd = i2c_get_clientdata(client); - - /* Register with the v4l2_device which increases the module's - use count as well. */ - if (v4l2_device_register_subdev(v4l2_dev, sd)) - sd = NULL; - /* Decrease the module use count to match the first try_module_get. */ - module_put(client->driver->driver.owner); - -error: - /* If we have a client but no subdev, then something went wrong and - we must unregister the client. */ - if (client && sd == NULL) - i2c_unregister_device(client); - return sd; -} -EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev_board); - -struct v4l2_subdev *v4l2_i2c_new_subdev(struct v4l2_device *v4l2_dev, - struct i2c_adapter *adapter, const char *client_type, - u8 addr, const unsigned short *probe_addrs) -{ - struct i2c_board_info info; - - /* Setup the i2c board info with the device type and - the device address. */ - memset(&info, 0, sizeof(info)); - strlcpy(info.type, client_type, sizeof(info.type)); - info.addr = addr; - - return v4l2_i2c_new_subdev_board(v4l2_dev, adapter, &info, probe_addrs); -} -EXPORT_SYMBOL_GPL(v4l2_i2c_new_subdev); - -/* Return i2c client address of v4l2_subdev. */ -unsigned short v4l2_i2c_subdev_addr(struct v4l2_subdev *sd) -{ - struct i2c_client *client = v4l2_get_subdevdata(sd); - - return client ? client->addr : I2C_CLIENT_END; -} -EXPORT_SYMBOL_GPL(v4l2_i2c_subdev_addr); - -/* Return a list of I2C tuner addresses to probe. Use only if the tuner - addresses are unknown. */ -const unsigned short *v4l2_i2c_tuner_addrs(enum v4l2_i2c_tuner_type type) -{ - static const unsigned short radio_addrs[] = { -#if defined(CONFIG_MEDIA_TUNER_TEA5761) || defined(CONFIG_MEDIA_TUNER_TEA5761_MODULE) - 0x10, -#endif - 0x60, - I2C_CLIENT_END - }; - static const unsigned short demod_addrs[] = { - 0x42, 0x43, 0x4a, 0x4b, - I2C_CLIENT_END - }; - static const unsigned short tv_addrs[] = { - 0x42, 0x43, 0x4a, 0x4b, /* tda8290 */ - 0x60, 0x61, 0x62, 0x63, 0x64, - I2C_CLIENT_END - }; - - switch (type) { - case ADDRS_RADIO: - return radio_addrs; - case ADDRS_DEMOD: - return demod_addrs; - case ADDRS_TV: - return tv_addrs; - case ADDRS_TV_WITH_DEMOD: - return tv_addrs + 4; - } - return NULL; -} -EXPORT_SYMBOL_GPL(v4l2_i2c_tuner_addrs); - -#endif /* defined(CONFIG_I2C) */ - -#if defined(CONFIG_SPI) - -/* Load a spi sub-device. */ - -void v4l2_spi_subdev_init(struct v4l2_subdev *sd, struct spi_device *spi, - const struct v4l2_subdev_ops *ops) -{ - v4l2_subdev_init(sd, ops); - sd->flags |= V4L2_SUBDEV_FL_IS_SPI; - /* the owner is the same as the spi_device's driver owner */ - sd->owner = spi->dev.driver->owner; - /* spi_device and v4l2_subdev point to one another */ - v4l2_set_subdevdata(sd, spi); - spi_set_drvdata(spi, sd); - /* initialize name */ - strlcpy(sd->name, spi->dev.driver->name, sizeof(sd->name)); -} -EXPORT_SYMBOL_GPL(v4l2_spi_subdev_init); - -struct v4l2_subdev *v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev, - struct spi_master *master, struct spi_board_info *info) -{ - struct v4l2_subdev *sd = NULL; - struct spi_device *spi = NULL; - - BUG_ON(!v4l2_dev); - - if (info->modalias) - request_module(info->modalias); - - spi = spi_new_device(master, info); - - if (spi == NULL || spi->dev.driver == NULL) - goto error; - - if (!try_module_get(spi->dev.driver->owner)) - goto error; - - sd = spi_get_drvdata(spi); - - /* Register with the v4l2_device which increases the module's - use count as well. */ - if (v4l2_device_register_subdev(v4l2_dev, sd)) - sd = NULL; - - /* Decrease the module use count to match the first try_module_get. */ - module_put(spi->dev.driver->owner); - -error: - /* If we have a client but no subdev, then something went wrong and - we must unregister the client. */ - if (spi && sd == NULL) - spi_unregister_device(spi); - - return sd; -} -EXPORT_SYMBOL_GPL(v4l2_spi_new_subdev); - -#endif /* defined(CONFIG_SPI) */ - -/* Clamp x to be between min and max, aligned to a multiple of 2^align. min - * and max don't have to be aligned, but there must be at least one valid - * value. E.g., min=17,max=31,align=4 is not allowed as there are no multiples - * of 16 between 17 and 31. */ -static unsigned int clamp_align(unsigned int x, unsigned int min, - unsigned int max, unsigned int align) -{ - /* Bits that must be zero to be aligned */ - unsigned int mask = ~((1 << align) - 1); - - /* Round to nearest aligned value */ - if (align) - x = (x + (1 << (align - 1))) & mask; - - /* Clamp to aligned value of min and max */ - if (x < min) - x = (min + ~mask) & mask; - else if (x > max) - x = max & mask; - - return x; -} - -/* Bound an image to have a width between wmin and wmax, and height between - * hmin and hmax, inclusive. Additionally, the width will be a multiple of - * 2^walign, the height will be a multiple of 2^halign, and the overall size - * (width*height) will be a multiple of 2^salign. The image may be shrunk - * or enlarged to fit the alignment constraints. - * - * The width or height maximum must not be smaller than the corresponding - * minimum. The alignments must not be so high there are no possible image - * sizes within the allowed bounds. wmin and hmin must be at least 1 - * (don't use 0). If you don't care about a certain alignment, specify 0, - * as 2^0 is 1 and one byte alignment is equivalent to no alignment. If - * you only want to adjust downward, specify a maximum that's the same as - * the initial value. - */ -void v4l_bound_align_image(u32 *w, unsigned int wmin, unsigned int wmax, - unsigned int walign, - u32 *h, unsigned int hmin, unsigned int hmax, - unsigned int halign, unsigned int salign) -{ - *w = clamp_align(*w, wmin, wmax, walign); - *h = clamp_align(*h, hmin, hmax, halign); - - /* Usually we don't need to align the size and are done now. */ - if (!salign) - return; - - /* How much alignment do we have? */ - walign = __ffs(*w); - halign = __ffs(*h); - /* Enough to satisfy the image alignment? */ - if (walign + halign < salign) { - /* Max walign where there is still a valid width */ - unsigned int wmaxa = __fls(wmax ^ (wmin - 1)); - /* Max halign where there is still a valid height */ - unsigned int hmaxa = __fls(hmax ^ (hmin - 1)); - - /* up the smaller alignment until we have enough */ - do { - if (halign >= hmaxa || - (walign <= halign && walign < wmaxa)) { - *w = clamp_align(*w, wmin, wmax, walign + 1); - walign = __ffs(*w); - } else { - *h = clamp_align(*h, hmin, hmax, halign + 1); - halign = __ffs(*h); - } - } while (halign + walign < salign); - } -} -EXPORT_SYMBOL_GPL(v4l_bound_align_image); - -/** - * v4l_fill_dv_preset_info - fill description of a digital video preset - * @preset - preset value - * @info - pointer to struct v4l2_dv_enum_preset - * - * drivers can use this helper function to fill description of dv preset - * in info. - */ -int v4l_fill_dv_preset_info(u32 preset, struct v4l2_dv_enum_preset *info) -{ - static const struct v4l2_dv_preset_info { - u16 width; - u16 height; - const char *name; - } dv_presets[] = { - { 0, 0, "Invalid" }, /* V4L2_DV_INVALID */ - { 720, 480, "480p@59.94" }, /* V4L2_DV_480P59_94 */ - { 720, 576, "576p@50" }, /* V4L2_DV_576P50 */ - { 1280, 720, "720p@24" }, /* V4L2_DV_720P24 */ - { 1280, 720, "720p@25" }, /* V4L2_DV_720P25 */ - { 1280, 720, "720p@30" }, /* V4L2_DV_720P30 */ - { 1280, 720, "720p@50" }, /* V4L2_DV_720P50 */ - { 1280, 720, "720p@59.94" }, /* V4L2_DV_720P59_94 */ - { 1280, 720, "720p@60" }, /* V4L2_DV_720P60 */ - { 1920, 1080, "1080i@29.97" }, /* V4L2_DV_1080I29_97 */ - { 1920, 1080, "1080i@30" }, /* V4L2_DV_1080I30 */ - { 1920, 1080, "1080i@25" }, /* V4L2_DV_1080I25 */ - { 1920, 1080, "1080i@50" }, /* V4L2_DV_1080I50 */ - { 1920, 1080, "1080i@60" }, /* V4L2_DV_1080I60 */ - { 1920, 1080, "1080p@24" }, /* V4L2_DV_1080P24 */ - { 1920, 1080, "1080p@25" }, /* V4L2_DV_1080P25 */ - { 1920, 1080, "1080p@30" }, /* V4L2_DV_1080P30 */ - { 1920, 1080, "1080p@50" }, /* V4L2_DV_1080P50 */ - { 1920, 1080, "1080p@60" }, /* V4L2_DV_1080P60 */ - }; - - if (info == NULL || preset >= ARRAY_SIZE(dv_presets)) - return -EINVAL; - - info->preset = preset; - info->width = dv_presets[preset].width; - info->height = dv_presets[preset].height; - strlcpy(info->name, dv_presets[preset].name, sizeof(info->name)); - return 0; -} -EXPORT_SYMBOL_GPL(v4l_fill_dv_preset_info); - -const struct v4l2_frmsize_discrete *v4l2_find_nearest_format( - const struct v4l2_discrete_probe *probe, - s32 width, s32 height) -{ - int i; - u32 error, min_error = UINT_MAX; - const struct v4l2_frmsize_discrete *size, *best = NULL; - - if (!probe) - return best; - - for (i = 0, size = probe->sizes; i < probe->num_sizes; i++, size++) { - error = abs(size->width - width) + abs(size->height - height); - if (error < min_error) { - min_error = error; - best = size; - } - if (!error) - break; - } - - return best; -} -EXPORT_SYMBOL_GPL(v4l2_find_nearest_format); |