diff options
Diffstat (limited to 'common/gpio_common.c')
| -rw-r--r-- | common/gpio_common.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/common/gpio_common.c b/common/gpio_common.c new file mode 100644 index 0000000000..11ab9fa4e7 --- /dev/null +++ b/common/gpio_common.c @@ -0,0 +1,188 @@ +/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +/* GPIO common functionality for Chrome EC */ + +#include "common.h" +#include "console.h" +#include "gpio.h" +#include "host_command.h" +#include "system.h" +#include "util.h" + +static uint8_t last_val[(GPIO_COUNT + 7) / 8]; + +/** + * Find a GPIO signal by name. + * + * @param name Signal name to find + * + * @return the signal index, or GPIO_COUNT if no match. + */ +static enum gpio_signal find_signal_by_name(const char *name) +{ + const struct gpio_info *g = gpio_list; + int i; + + if (!name || !*name) + return GPIO_COUNT; + + for (i = 0; i < GPIO_COUNT; i++, g++) { + if (!strcasecmp(name, g->name)) + return i; + } + + return GPIO_COUNT; +} + +/** + * Update last_val + * + * @param i Index of last_val[] to update + * @param v New value for last_val[i] + * + * @return 1 if last_val[i] was updated, 0 if last_val[i]==v. + */ +static int last_val_changed(int i, int v) +{ + if (v && !(last_val[i / 8] & (1 << (i % 8)))) { + last_val[i / 8] |= 1 << (i % 8); + return 1; + } else if (!v && last_val[i / 8] & (1 << (i % 8))) { + last_val[i / 8] &= ~(1 << (i % 8)); + return 1; + } else { + return 0; + } +} + +/*****************************************************************************/ +/* GPIO API */ + +const char *gpio_get_name(enum gpio_signal signal) +{ + return gpio_list[signal].name; +} + +/*****************************************************************************/ +/* Console commands */ + +static int command_gpio_get(int argc, char **argv) +{ + const struct gpio_info *g = gpio_list; + int changed, v, i; + + /* If a signal is specified, print only that one */ + if (argc == 2) { + i = find_signal_by_name(argv[1]); + if (i == GPIO_COUNT) + return EC_ERROR_PARAM1; + g = gpio_list + i; + v = gpio_get_level(i); + changed = last_val_changed(i, v); + ccprintf(" %d%c %s\n", v, (changed ? '*' : ' '), g->name); + + return EC_SUCCESS; + } + + /* Otherwise print them all */ + for (i = 0; i < GPIO_COUNT; i++, g++) { + if (!g->mask) + continue; /* Skip unsupported signals */ + + v = gpio_get_level(i); + changed = last_val_changed(i, v); + ccprintf(" %d%c %s\n", v, (changed ? '*' : ' '), g->name); + + /* Flush console to avoid truncating output */ + cflush(); + } + return EC_SUCCESS; +} +DECLARE_CONSOLE_COMMAND(gpioget, command_gpio_get, + "[name]", + "Read GPIO value(s)", + NULL); + +static int command_gpio_set(int argc, char **argv) +{ + const struct gpio_info *g; + char *e; + int v, i; + + if (argc < 3) + return EC_ERROR_PARAM_COUNT; + + i = find_signal_by_name(argv[1]); + if (i == GPIO_COUNT) + return EC_ERROR_PARAM1; + g = gpio_list + i; + + if (!g->mask) + return EC_ERROR_PARAM1; + + if (!(g->flags & GPIO_OUTPUT)) + return EC_ERROR_PARAM1; + + v = strtoi(argv[2], &e, 0); + if (*e) + return EC_ERROR_PARAM2; + + gpio_set_level(i, v); + + return EC_SUCCESS; +} +DECLARE_CONSOLE_COMMAND(gpioset, command_gpio_set, + "name <0 | 1>", + "Set a GPIO", + NULL); + +/*****************************************************************************/ +/* Host commands */ + +static int gpio_command_get(struct host_cmd_handler_args *args) +{ + const struct ec_params_gpio_get *p = args->params; + struct ec_response_gpio_get *r = args->response; + int i; + + if (system_is_locked()) + return EC_RES_ACCESS_DENIED; + + i = find_signal_by_name(p->name); + if (i == GPIO_COUNT) + return EC_RES_ERROR; + + r->val = gpio_get_level(i); + args->response_size = sizeof(struct ec_response_gpio_get); + return EC_RES_SUCCESS; +} +DECLARE_HOST_COMMAND(EC_CMD_GPIO_GET, gpio_command_get, EC_VER_MASK(0)); + +static int gpio_command_set(struct host_cmd_handler_args *args) +{ + const struct ec_params_gpio_set *p = args->params; + const struct gpio_info *g; + int i; + + if (system_is_locked()) + return EC_RES_ACCESS_DENIED; + + i = find_signal_by_name(p->name); + if (i == GPIO_COUNT) + return EC_RES_ERROR; + g = gpio_list + i; + + if (!g->mask) + return EC_RES_ERROR; + + if (!(g->flags & GPIO_OUTPUT)) + return EC_RES_ERROR; + + gpio_set_level(i, p->val); + + return EC_RES_SUCCESS; +} +DECLARE_HOST_COMMAND(EC_CMD_GPIO_SET, gpio_command_set, EC_VER_MASK(0)); |