| /* |
| * Core driver for the generic pin config portions of the pin control subsystem |
| * |
| * Copyright (C) 2011 ST-Ericsson SA |
| * Written on behalf of Linaro for ST-Ericsson |
| * |
| * Author: Linus Walleij <linus.walleij@linaro.org> |
| * |
| * License terms: GNU General Public License (GPL) version 2 |
| */ |
| |
| #define pr_fmt(fmt) "generic pinconfig core: " fmt |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/device.h> |
| #include <linux/slab.h> |
| #include <linux/debugfs.h> |
| #include <linux/seq_file.h> |
| #include <linux/pinctrl/pinctrl.h> |
| #include <linux/pinctrl/pinconf.h> |
| #include <linux/pinctrl/pinconf-generic.h> |
| #include <linux/of.h> |
| #include "core.h" |
| #include "pinconf.h" |
| #include "pinctrl-utils.h" |
| |
| #ifdef CONFIG_DEBUG_FS |
| static const struct pin_config_item conf_items[] = { |
| PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false), |
| PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false), |
| PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false), |
| PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false), |
| PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL, false), |
| PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, |
| "input bias pull to pin specific state", NULL, false), |
| PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false), |
| PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false), |
| PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false), |
| PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true), |
| PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false), |
| PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false), |
| PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false), |
| PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true), |
| PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true), |
| PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true), |
| PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true), |
| PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true), |
| }; |
| |
| static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev, |
| struct seq_file *s, const char *gname, |
| unsigned pin, |
| const struct pin_config_item *items, |
| int nitems) |
| { |
| int i; |
| |
| for (i = 0; i < nitems; i++) { |
| unsigned long config; |
| int ret; |
| |
| /* We want to check out this parameter */ |
| config = pinconf_to_config_packed(items[i].param, 0); |
| if (gname) |
| ret = pin_config_group_get(dev_name(pctldev->dev), |
| gname, &config); |
| else |
| ret = pin_config_get_for_pin(pctldev, pin, &config); |
| /* These are legal errors */ |
| if (ret == -EINVAL || ret == -ENOTSUPP) |
| continue; |
| if (ret) { |
| seq_printf(s, "ERROR READING CONFIG SETTING %d ", i); |
| continue; |
| } |
| /* Space between multiple configs */ |
| seq_puts(s, " "); |
| seq_puts(s, items[i].display); |
| /* Print unit if available */ |
| if (items[i].has_arg) { |
| seq_printf(s, " (%u", |
| pinconf_to_config_argument(config)); |
| if (items[i].format) |
| seq_printf(s, " %s)", items[i].format); |
| else |
| seq_puts(s, ")"); |
| } |
| } |
| } |
| |
| /** |
| * pinconf_generic_dump_pins - Print information about pin or group of pins |
| * @pctldev: Pincontrol device |
| * @s: File to print to |
| * @gname: Group name specifying pins |
| * @pin: Pin number specyfying pin |
| * |
| * Print the pinconf configuration for the requested pin(s) to @s. Pins can be |
| * specified either by pin using @pin or by group using @gname. Only one needs |
| * to be specified the other can be NULL/0. |
| */ |
| void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev, struct seq_file *s, |
| const char *gname, unsigned pin) |
| { |
| const struct pinconf_ops *ops = pctldev->desc->confops; |
| |
| if (!ops->is_generic) |
| return; |
| |
| /* generic parameters */ |
| pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items, |
| ARRAY_SIZE(conf_items)); |
| /* driver-specific parameters */ |
| if (pctldev->desc->num_custom_params && |
| pctldev->desc->custom_conf_items) |
| pinconf_generic_dump_one(pctldev, s, gname, pin, |
| pctldev->desc->custom_conf_items, |
| pctldev->desc->num_custom_params); |
| } |
| |
| void pinconf_generic_dump_config(struct pinctrl_dev *pctldev, |
| struct seq_file *s, unsigned long config) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(conf_items); i++) { |
| if (pinconf_to_config_param(config) != conf_items[i].param) |
| continue; |
| seq_printf(s, "%s: 0x%x", conf_items[i].display, |
| pinconf_to_config_argument(config)); |
| } |
| |
| if (!pctldev->desc->num_custom_params || |
| !pctldev->desc->custom_conf_items) |
| return; |
| |
| for (i = 0; i < pctldev->desc->num_custom_params; i++) { |
| if (pinconf_to_config_param(config) != |
| pctldev->desc->custom_conf_items[i].param) |
| continue; |
| seq_printf(s, "%s: 0x%x", |
| pctldev->desc->custom_conf_items[i].display, |
| pinconf_to_config_argument(config)); |
| } |
| } |
| EXPORT_SYMBOL_GPL(pinconf_generic_dump_config); |
| #endif |
| |
| #ifdef CONFIG_OF |
| static const struct pinconf_generic_params dt_params[] = { |
| { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 }, |
| { "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 }, |
| { "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 }, |
| { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 }, |
| { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 }, |
| { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 }, |
| { "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 }, |
| { "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 }, |
| { "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 }, |
| { "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 }, |
| { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 }, |
| { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 }, |
| { "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 }, |
| { "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 }, |
| { "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 }, |
| { "power-source", PIN_CONFIG_POWER_SOURCE, 0 }, |
| { "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 }, |
| { "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 }, |
| { "output-low", PIN_CONFIG_OUTPUT, 0, }, |
| { "output-high", PIN_CONFIG_OUTPUT, 1, }, |
| { "slew-rate", PIN_CONFIG_SLEW_RATE, 0}, |
| }; |
| |
| /** |
| * parse_dt_cfg() - Parse DT pinconf parameters |
| * @np: DT node |
| * @params: Array of describing generic parameters |
| * @count: Number of entries in @params |
| * @cfg: Array of parsed config options |
| * @ncfg: Number of entries in @cfg |
| * |
| * Parse the config options described in @params from @np and puts the result |
| * in @cfg. @cfg does not need to be empty, entries are added beggining at |
| * @ncfg. @ncfg is updated to reflect the number of entries after parsing. @cfg |
| * needs to have enough memory allocated to hold all possible entries. |
| */ |
| static void parse_dt_cfg(struct device_node *np, |
| const struct pinconf_generic_params *params, |
| unsigned int count, unsigned long *cfg, |
| unsigned int *ncfg) |
| { |
| int i; |
| |
| for (i = 0; i < count; i++) { |
| u32 val; |
| int ret; |
| const struct pinconf_generic_params *par = ¶ms[i]; |
| |
| ret = of_property_read_u32(np, par->property, &val); |
| |
| /* property not found */ |
| if (ret == -EINVAL) |
| continue; |
| |
| /* use default value, when no value is specified */ |
| if (ret) |
| val = par->default_value; |
| |
| pr_debug("found %s with value %u\n", par->property, val); |
| cfg[*ncfg] = pinconf_to_config_packed(par->param, val); |
| (*ncfg)++; |
| } |
| } |
| |
| /** |
| * pinconf_generic_parse_dt_config() |
| * parse the config properties into generic pinconfig values. |
| * @np: node containing the pinconfig properties |
| * @configs: array with nconfigs entries containing the generic pinconf values |
| * @nconfigs: umber of configurations |
| */ |
| int pinconf_generic_parse_dt_config(struct device_node *np, |
| struct pinctrl_dev *pctldev, |
| unsigned long **configs, |
| unsigned int *nconfigs) |
| { |
| unsigned long *cfg; |
| unsigned int max_cfg, ncfg = 0; |
| int ret; |
| |
| if (!np) |
| return -EINVAL; |
| |
| /* allocate a temporary array big enough to hold one of each option */ |
| max_cfg = ARRAY_SIZE(dt_params); |
| if (pctldev) |
| max_cfg += pctldev->desc->num_custom_params; |
| cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL); |
| if (!cfg) |
| return -ENOMEM; |
| |
| parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg); |
| if (pctldev && pctldev->desc->num_custom_params && |
| pctldev->desc->custom_params) |
| parse_dt_cfg(np, pctldev->desc->custom_params, |
| pctldev->desc->num_custom_params, cfg, &ncfg); |
| |
| ret = 0; |
| |
| /* no configs found at all */ |
| if (ncfg == 0) { |
| *configs = NULL; |
| *nconfigs = 0; |
| goto out; |
| } |
| |
| /* |
| * Now limit the number of configs to the real number of |
| * found properties. |
| */ |
| *configs = kmemdup(cfg, ncfg * sizeof(unsigned long), GFP_KERNEL); |
| if (!*configs) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| *nconfigs = ncfg; |
| |
| out: |
| kfree(cfg); |
| return ret; |
| } |
| |
| int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev, |
| struct device_node *np, struct pinctrl_map **map, |
| unsigned *reserved_maps, unsigned *num_maps, |
| enum pinctrl_map_type type) |
| { |
| int ret; |
| const char *function; |
| struct device *dev = pctldev->dev; |
| unsigned long *configs = NULL; |
| unsigned num_configs = 0; |
| unsigned reserve, strings_count; |
| struct property *prop; |
| const char *group; |
| const char *subnode_target_type = "pins"; |
| |
| ret = of_property_count_strings(np, "pins"); |
| if (ret < 0) { |
| ret = of_property_count_strings(np, "groups"); |
| if (ret < 0) |
| /* skip this node; may contain config child nodes */ |
| return 0; |
| if (type == PIN_MAP_TYPE_INVALID) |
| type = PIN_MAP_TYPE_CONFIGS_GROUP; |
| subnode_target_type = "groups"; |
| } else { |
| if (type == PIN_MAP_TYPE_INVALID) |
| type = PIN_MAP_TYPE_CONFIGS_PIN; |
| } |
| strings_count = ret; |
| |
| ret = of_property_read_string(np, "function", &function); |
| if (ret < 0) { |
| /* EINVAL=missing, which is fine since it's optional */ |
| if (ret != -EINVAL) |
| dev_err(dev, "%s: could not parse property function\n", |
| of_node_full_name(np)); |
| function = NULL; |
| } |
| |
| ret = pinconf_generic_parse_dt_config(np, pctldev, &configs, |
| &num_configs); |
| if (ret < 0) { |
| dev_err(dev, "%s: could not parse node property\n", |
| of_node_full_name(np)); |
| return ret; |
| } |
| |
| reserve = 0; |
| if (function != NULL) |
| reserve++; |
| if (num_configs) |
| reserve++; |
| |
| reserve *= strings_count; |
| |
| ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, |
| num_maps, reserve); |
| if (ret < 0) |
| goto exit; |
| |
| of_property_for_each_string(np, subnode_target_type, prop, group) { |
| if (function) { |
| ret = pinctrl_utils_add_map_mux(pctldev, map, |
| reserved_maps, num_maps, group, |
| function); |
| if (ret < 0) |
| goto exit; |
| } |
| |
| if (num_configs) { |
| ret = pinctrl_utils_add_map_configs(pctldev, map, |
| reserved_maps, num_maps, group, configs, |
| num_configs, type); |
| if (ret < 0) |
| goto exit; |
| } |
| } |
| ret = 0; |
| |
| exit: |
| kfree(configs); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map); |
| |
| int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev, |
| struct device_node *np_config, struct pinctrl_map **map, |
| unsigned *num_maps, enum pinctrl_map_type type) |
| { |
| unsigned reserved_maps; |
| struct device_node *np; |
| int ret; |
| |
| reserved_maps = 0; |
| *map = NULL; |
| *num_maps = 0; |
| |
| ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map, |
| &reserved_maps, num_maps, type); |
| if (ret < 0) |
| goto exit; |
| |
| for_each_child_of_node(np_config, np) { |
| ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map, |
| &reserved_maps, num_maps, type); |
| if (ret < 0) |
| goto exit; |
| } |
| return 0; |
| |
| exit: |
| pinctrl_utils_dt_free_map(pctldev, *map, *num_maps); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map); |
| |
| #endif |