dm: regulator: add regulator command

This command is based on driver model regulator's API.
The user interface provides:
- list UCLASS regulator devices
- show or [set] operating regulator device
- print constraints info
- print operating status
- print/[set] voltage value [uV] (force)
- print/[set] current value [uA]
- print/[set] operating mode id
- enable the regulator output
- disable the regulator output

The 'force' option can be used for setting the value which exceeds
the constraints min/max limits.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>

common/Kconfig

@@ -473,5 +473,27 @@ config CMD_PMIC
 	  - pmic read address  - read byte of register at address
 	  - pmic write address - write byte to register at address
 	  The only one change for this command is 'dev' subcommand.
+
+config CMD_REGULATOR
+	bool "Enable Driver Model REGULATOR command"
+	depends on DM_REGULATOR
+	help
+	  This command is based on driver model regulator's API.
+	  User interface features:
+	  - list               - list regulator devices
+	  - regulator dev <id> - show or [set] operating regulator device
+	  - regulator info     - print constraints info
+	  - regulator status   - print operating status
+	  - regulator value <val] <-f> - print/[set] voltage value [uV]
+	  - regulator current <val>    - print/[set] current value [uA]
+	  - regulator mode <id>        - print/[set] operating mode id
+	  - regulator enable           - enable the regulator output
+	  - regulator disable          - disable the regulator output
+
+	  The '-f' (force) option can be used for set the value which exceeds
+	  the limits, which are found in device-tree and are kept in regulator's
+	  uclass platdata structure.
+
 endmenu
+
 endmenu

common/Makefile

@@ -214,6 +214,7 @@ obj-$(CONFIG_CMD_GPT) += cmd_gpt.o
 
 # Power
 obj-$(CONFIG_CMD_PMIC) += cmd_pmic.o
+obj-$(CONFIG_CMD_REGULATOR) += cmd_regulator.o
 endif
 
 ifdef CONFIG_SPL_BUILD

common/cmd_regulator.c

@@ -0,0 +1,403 @@
+/*
+ * Copyright (C) 2014-2015 Samsung Electronics
+ * Przemyslaw Marczak <p.marczak@samsung.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <errno.h>
+#include <dm.h>
+#include <dm/uclass-internal.h>
+#include <power/regulator.h>
+
+#define LIMIT_SEQ	3
+#define LIMIT_DEVNAME	20
+#define LIMIT_OFNAME	20
+#define LIMIT_INFO	16
+
+static struct udevice *currdev;
+
+static int failed(const char *getset, const char *thing,
+		  const char *for_dev, int ret)
+{
+	printf("Can't %s %s %s.\nError: %d (%s)\n", getset, thing, for_dev,
+						    ret, errno_str(ret));
+	return CMD_RET_FAILURE;
+}
+
+static int regulator_get(bool list_only, int get_seq, struct udevice **devp)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+	struct udevice *dev;
+	int ret;
+
+	if (devp)
+		*devp = NULL;
+
+	for (ret = uclass_first_device(UCLASS_REGULATOR, &dev); dev;
+	     ret = uclass_next_device(&dev)) {
+		if (list_only) {
+			uc_pdata = dev_get_uclass_platdata(dev);
+			printf("|%*d | %*.*s @ %-*.*s| %s @ %s\n",
+			       LIMIT_SEQ, dev->seq,
+			       LIMIT_DEVNAME, LIMIT_DEVNAME, dev->name,
+			       LIMIT_OFNAME, LIMIT_OFNAME, uc_pdata->name,
+			       dev->parent->name,
+			       dev_get_uclass_name(dev->parent));
+			continue;
+		}
+
+		if (dev->seq == get_seq) {
+			if (devp)
+				*devp = dev;
+			else
+				return -EINVAL;
+
+			return 0;
+		}
+	}
+
+	if (list_only)
+		return ret;
+
+	return -ENODEV;
+}
+
+static int do_dev(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+	int seq, ret = -ENXIO;
+
+	switch (argc) {
+	case 2:
+		seq = simple_strtoul(argv[1], NULL, 0);
+		ret = uclass_get_device_by_seq(UCLASS_REGULATOR, seq, &currdev);
+		if (ret && (ret = regulator_get(false, seq, &currdev)))
+			goto failed;
+	case 1:
+		uc_pdata = dev_get_uclass_platdata(currdev);
+		if (!uc_pdata)
+			goto failed;
+
+		printf("dev: %d @ %s\n", currdev->seq, uc_pdata->name);
+	}
+
+	return CMD_RET_SUCCESS;
+failed:
+	return failed("get", "the", "device", ret);
+}
+
+static int get_curr_dev_and_pl(struct udevice **devp,
+			       struct dm_regulator_uclass_platdata **uc_pdata,
+			       bool allow_type_fixed)
+{
+	*devp = NULL;
+	*uc_pdata = NULL;
+
+	if (!currdev)
+		return failed("get", "current", "device", -ENODEV);
+
+	*devp = currdev;
+
+	*uc_pdata = dev_get_uclass_platdata(*devp);
+	if (!*uc_pdata)
+		return failed("get", "regulator", "platdata", -ENXIO);
+
+	if (!allow_type_fixed && (*uc_pdata)->type == REGULATOR_TYPE_FIXED) {
+		printf("Operation not allowed for fixed regulator!\n");
+		return CMD_RET_FAILURE;
+	}
+
+	return CMD_RET_SUCCESS;
+}
+
+static int do_list(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	int ret;
+
+	printf("|%*s | %*.*s @ %-*.*s| %s @ %s\n",
+	       LIMIT_SEQ, "Seq",
+	       LIMIT_DEVNAME, LIMIT_DEVNAME, "Name",
+	       LIMIT_OFNAME, LIMIT_OFNAME, "fdtname",
+	       "Parent", "uclass");
+
+	ret = regulator_get(true, 0, NULL);
+	if (ret)
+		return CMD_RET_FAILURE;
+
+	return CMD_RET_SUCCESS;
+}
+
+static int constraint(const char *name, int val, const char *val_name)
+{
+	printf("%-*s", LIMIT_INFO, name);
+	if (val < 0) {
+		printf(" %s (err: %d)\n", errno_str(val), val);
+		return val;
+	}
+
+	if (val_name)
+		printf(" %d (%s)\n", val, val_name);
+	else
+		printf(" %d\n", val);
+
+	return 0;
+}
+
+static const char *get_mode_name(struct dm_regulator_mode *mode,
+				 int mode_count,
+				 int mode_id)
+{
+	while (mode_count--) {
+		if (mode->id == mode_id)
+			return mode->name;
+		mode++;
+	}
+
+	return NULL;
+}
+
+static int do_info(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	struct udevice *dev;
+	struct dm_regulator_uclass_platdata *uc_pdata;
+	struct dm_regulator_mode *modes;
+	const char *parent_uc;
+	int mode_count;
+	int ret;
+	int i;
+
+	ret = get_curr_dev_and_pl(&dev, &uc_pdata, true);
+	if (ret)
+		return ret;
+
+	parent_uc = dev_get_uclass_name(dev->parent);
+
+	printf("Uclass regulator dev %d info:\n", dev->seq);
+	printf("%-*s %s @ %s\n%-*s %s\n%-*s %s\n%-*s\n",
+	       LIMIT_INFO, "* parent:", dev->parent->name, parent_uc,
+	       LIMIT_INFO, "* dev name:", dev->name,
+	       LIMIT_INFO, "* fdt name:", uc_pdata->name,
+	       LIMIT_INFO, "* constraints:");
+
+	constraint("  - min uV:", uc_pdata->min_uV, NULL);
+	constraint("  - max uV:", uc_pdata->max_uV, NULL);
+	constraint("  - min uA:", uc_pdata->min_uA, NULL);
+	constraint("  - max uA:", uc_pdata->max_uA, NULL);
+	constraint("  - always on:", uc_pdata->always_on,
+		   uc_pdata->always_on ? "true" : "false");
+	constraint("  - boot on:", uc_pdata->boot_on,
+		   uc_pdata->boot_on ? "true" : "false");
+
+	mode_count = regulator_mode(dev, &modes);
+	constraint("* op modes:", mode_count, NULL);
+
+	for (i = 0; i < mode_count; i++, modes++)
+		constraint("  - mode id:", modes->id, modes->name);
+
+	return CMD_RET_SUCCESS;
+}
+
+static int do_status(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+	int current, value, mode, ret;
+	const char *mode_name = NULL;
+	struct udevice *dev;
+	bool enabled;
+
+	ret = get_curr_dev_and_pl(&dev, &uc_pdata, true);
+	if (ret)
+		return ret;
+
+	enabled = regulator_get_enable(dev);
+	constraint(" * enable:", enabled, enabled ? "true" : "false");
+
+	value = regulator_get_value(dev);
+	constraint(" * value uV:", value, NULL);
+
+	current = regulator_get_current(dev);
+	constraint(" * current uA:", current, NULL);
+
+	mode = regulator_get_mode(dev);
+	mode_name = get_mode_name(uc_pdata->mode, uc_pdata->mode_count, mode);
+	constraint(" * mode id:", mode, mode_name);
+
+	return CMD_RET_SUCCESS;
+}
+
+static int do_value(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	struct udevice *dev;
+	struct dm_regulator_uclass_platdata *uc_pdata;
+	int value;
+	int force;
+	int ret;
+
+	ret = get_curr_dev_and_pl(&dev, &uc_pdata, argc == 1);
+	if (ret)
+		return ret;
+
+	if (argc == 1) {
+		value = regulator_get_value(dev);
+		if (value < 0)
+			return failed("get", uc_pdata->name, "voltage", value);
+
+		printf("%d uV\n", value);
+		return CMD_RET_SUCCESS;
+	}
+
+	if (argc == 3)
+		force = !strcmp("-f", argv[2]);
+	else
+		force = 0;
+
+	value = simple_strtoul(argv[1], NULL, 0);
+	if ((value < uc_pdata->min_uV || value > uc_pdata->max_uV) && !force) {
+		printf("Value exceeds regulator constraint limits\n");
+		return CMD_RET_FAILURE;
+	}
+
+	ret = regulator_set_value(dev, value);
+	if (ret)
+		return failed("set", uc_pdata->name, "voltage value", ret);
+
+	return CMD_RET_SUCCESS;
+}
+
+static int do_current(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	struct udevice *dev;
+	struct dm_regulator_uclass_platdata *uc_pdata;
+	int current;
+	int ret;
+
+	ret = get_curr_dev_and_pl(&dev, &uc_pdata, argc == 1);
+	if (ret)
+		return ret;
+
+	if (argc == 1) {
+		current = regulator_get_current(dev);
+		if (current < 0)
+			return failed("get", uc_pdata->name, "current", current);
+
+		printf("%d uA\n", current);
+		return CMD_RET_SUCCESS;
+	}
+
+	current = simple_strtoul(argv[1], NULL, 0);
+	if (current < uc_pdata->min_uA || current > uc_pdata->max_uA) {
+		printf("Current exceeds regulator constraint limits\n");
+		return CMD_RET_FAILURE;
+	}
+
+	ret = regulator_set_current(dev, current);
+	if (ret)
+		return failed("set", uc_pdata->name, "current value", ret);
+
+	return CMD_RET_SUCCESS;
+}
+
+static int do_mode(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	struct udevice *dev;
+	struct dm_regulator_uclass_platdata *uc_pdata;
+	int new_mode;
+	int mode;
+	int ret;
+
+	ret = get_curr_dev_and_pl(&dev, &uc_pdata, false);
+	if (ret)
+		return ret;
+
+	if (argc == 1) {
+		mode = regulator_get_mode(dev);
+		if (mode < 0)
+			return failed("get", uc_pdata->name, "mode", mode);
+
+		printf("mode id: %d\n", mode);
+		return CMD_RET_SUCCESS;
+	}
+
+	new_mode = simple_strtoul(argv[1], NULL, 0);
+
+	ret = regulator_set_mode(dev, new_mode);
+	if (ret)
+		return failed("set", uc_pdata->name, "mode", ret);
+
+	return CMD_RET_SUCCESS;
+}
+
+static int do_enable(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	struct udevice *dev;
+	struct dm_regulator_uclass_platdata *uc_pdata;
+	int ret;
+
+	ret = get_curr_dev_and_pl(&dev, &uc_pdata, true);
+	if (ret)
+		return ret;
+
+	ret = regulator_set_enable(dev, true);
+	if (ret)
+		return failed("enable", "regulator", uc_pdata->name, ret);
+
+	return CMD_RET_SUCCESS;
+}
+
+static int do_disable(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	struct udevice *dev;
+	struct dm_regulator_uclass_platdata *uc_pdata;
+	int ret;
+
+	ret = get_curr_dev_and_pl(&dev, &uc_pdata, true);
+	if (ret)
+		return ret;
+
+	ret = regulator_set_enable(dev, false);
+	if (ret)
+		return failed("disable", "regulator", uc_pdata->name, ret);
+
+	return CMD_RET_SUCCESS;
+}
+
+static cmd_tbl_t subcmd[] = {
+	U_BOOT_CMD_MKENT(dev, 2, 1, do_dev, "", ""),
+	U_BOOT_CMD_MKENT(list, 1, 1, do_list, "", ""),
+	U_BOOT_CMD_MKENT(info, 2, 1, do_info, "", ""),
+	U_BOOT_CMD_MKENT(status, 2, 1, do_status, "", ""),
+	U_BOOT_CMD_MKENT(value, 3, 1, do_value, "", ""),
+	U_BOOT_CMD_MKENT(current, 3, 1, do_current, "", ""),
+	U_BOOT_CMD_MKENT(mode, 2, 1, do_mode, "", ""),
+	U_BOOT_CMD_MKENT(enable, 1, 1, do_enable, "", ""),
+	U_BOOT_CMD_MKENT(disable, 1, 1, do_disable, "", ""),
+};
+
+static int do_regulator(cmd_tbl_t *cmdtp, int flag, int argc,
+			char * const argv[])
+{
+	cmd_tbl_t *cmd;
+
+	argc--;
+	argv++;
+
+	cmd = find_cmd_tbl(argv[0], subcmd, ARRAY_SIZE(subcmd));
+	if (cmd == NULL || argc > cmd->maxargs)
+		return CMD_RET_USAGE;
+
+	return cmd->cmd(cmdtp, flag, argc, argv);
+}
+
+U_BOOT_CMD(regulator, CONFIG_SYS_MAXARGS, 1, do_regulator,
+	"uclass operations",
+	"list         - list UCLASS regulator devices\n"
+	"regulator dev [id]     - show or [set] operating regulator device\n"
+	"regulator [info]       - print constraints info\n"
+	"regulator [status]     - print operating status\n"
+	"regulator [value] [-f] - print/[set] voltage value [uV] (force)\n"
+	"regulator [current]    - print/[set] current value [uA]\n"
+	"regulator [mode_id]    - print/[set] operating mode id\n"
+	"regulator [enable]     - enable the regulator output\n"
+	"regulator [disable]    - disable the regulator output\n"
+);