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path: root/drivers/regulator/ab8500-ext.c
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Diffstat (limited to 'drivers/regulator/ab8500-ext.c')
-rw-r--r--drivers/regulator/ab8500-ext.c460
1 files changed, 460 insertions, 0 deletions
diff --git a/drivers/regulator/ab8500-ext.c b/drivers/regulator/ab8500-ext.c
new file mode 100644
index 000000000..84c1ee39d
--- /dev/null
+++ b/drivers/regulator/ab8500-ext.c
@@ -0,0 +1,460 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * License Terms: GNU General Public License v2
+ *
+ * Authors: Bengt Jonsson <bengt.g.jonsson@stericsson.com>
+ *
+ * This file is based on drivers/regulator/ab8500.c
+ *
+ * AB8500 external regulators
+ *
+ * ab8500-ext supports the following regulators:
+ * - VextSupply3
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/mfd/abx500.h>
+#include <linux/mfd/abx500/ab8500.h>
+#include <linux/regulator/ab8500.h>
+
+/**
+ * struct ab8500_ext_regulator_info - ab8500 regulator information
+ * @dev: device pointer
+ * @desc: regulator description
+ * @rdev: regulator device
+ * @cfg: regulator configuration (extension of regulator FW configuration)
+ * @update_bank: bank to control on/off
+ * @update_reg: register to control on/off
+ * @update_mask: mask to enable/disable and set mode of regulator
+ * @update_val: bits holding the regulator current mode
+ * @update_val_hp: bits to set EN pin active (LPn pin deactive)
+ * normally this means high power mode
+ * @update_val_lp: bits to set EN pin active and LPn pin active
+ * normally this means low power mode
+ * @update_val_hw: bits to set regulator pins in HW control
+ * SysClkReq pins and logic will choose mode
+ */
+struct ab8500_ext_regulator_info {
+ struct device *dev;
+ struct regulator_desc desc;
+ struct regulator_dev *rdev;
+ struct ab8500_ext_regulator_cfg *cfg;
+ u8 update_bank;
+ u8 update_reg;
+ u8 update_mask;
+ u8 update_val;
+ u8 update_val_hp;
+ u8 update_val_lp;
+ u8 update_val_hw;
+};
+
+static int ab8500_ext_regulator_enable(struct regulator_dev *rdev)
+{
+ int ret;
+ struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
+ u8 regval;
+
+ if (info == NULL) {
+ dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
+ return -EINVAL;
+ }
+
+ /*
+ * To satisfy both HW high power request and SW request, the regulator
+ * must be on in high power.
+ */
+ if (info->cfg && info->cfg->hwreq)
+ regval = info->update_val_hp;
+ else
+ regval = info->update_val;
+
+ ret = abx500_mask_and_set_register_interruptible(info->dev,
+ info->update_bank, info->update_reg,
+ info->update_mask, regval);
+ if (ret < 0) {
+ dev_err(rdev_get_dev(info->rdev),
+ "couldn't set enable bits for regulator\n");
+ return ret;
+ }
+
+ dev_dbg(rdev_get_dev(rdev),
+ "%s-enable (bank, reg, mask, value): 0x%02x, 0x%02x, 0x%02x, 0x%02x\n",
+ info->desc.name, info->update_bank, info->update_reg,
+ info->update_mask, regval);
+
+ return 0;
+}
+
+static int ab8500_ext_regulator_disable(struct regulator_dev *rdev)
+{
+ int ret;
+ struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
+ u8 regval;
+
+ if (info == NULL) {
+ dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Set the regulator in HW request mode if configured
+ */
+ if (info->cfg && info->cfg->hwreq)
+ regval = info->update_val_hw;
+ else
+ regval = 0;
+
+ ret = abx500_mask_and_set_register_interruptible(info->dev,
+ info->update_bank, info->update_reg,
+ info->update_mask, regval);
+ if (ret < 0) {
+ dev_err(rdev_get_dev(info->rdev),
+ "couldn't set disable bits for regulator\n");
+ return ret;
+ }
+
+ dev_dbg(rdev_get_dev(rdev), "%s-disable (bank, reg, mask, value):"
+ " 0x%02x, 0x%02x, 0x%02x, 0x%02x\n",
+ info->desc.name, info->update_bank, info->update_reg,
+ info->update_mask, regval);
+
+ return 0;
+}
+
+static int ab8500_ext_regulator_is_enabled(struct regulator_dev *rdev)
+{
+ int ret;
+ struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
+ u8 regval;
+
+ if (info == NULL) {
+ dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
+ return -EINVAL;
+ }
+
+ ret = abx500_get_register_interruptible(info->dev,
+ info->update_bank, info->update_reg, &regval);
+ if (ret < 0) {
+ dev_err(rdev_get_dev(rdev),
+ "couldn't read 0x%x register\n", info->update_reg);
+ return ret;
+ }
+
+ dev_dbg(rdev_get_dev(rdev), "%s-is_enabled (bank, reg, mask, value):"
+ " 0x%02x, 0x%02x, 0x%02x, 0x%02x\n",
+ info->desc.name, info->update_bank, info->update_reg,
+ info->update_mask, regval);
+
+ if (((regval & info->update_mask) == info->update_val_lp) ||
+ ((regval & info->update_mask) == info->update_val_hp))
+ return 1;
+ else
+ return 0;
+}
+
+static int ab8500_ext_regulator_set_mode(struct regulator_dev *rdev,
+ unsigned int mode)
+{
+ int ret = 0;
+ struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
+ u8 regval;
+
+ if (info == NULL) {
+ dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
+ return -EINVAL;
+ }
+
+ switch (mode) {
+ case REGULATOR_MODE_NORMAL:
+ regval = info->update_val_hp;
+ break;
+ case REGULATOR_MODE_IDLE:
+ regval = info->update_val_lp;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ /* If regulator is enabled and info->cfg->hwreq is set, the regulator
+ must be on in high power, so we don't need to write the register with
+ the same value.
+ */
+ if (ab8500_ext_regulator_is_enabled(rdev) &&
+ !(info->cfg && info->cfg->hwreq)) {
+ ret = abx500_mask_and_set_register_interruptible(info->dev,
+ info->update_bank, info->update_reg,
+ info->update_mask, regval);
+ if (ret < 0) {
+ dev_err(rdev_get_dev(rdev),
+ "Could not set regulator mode.\n");
+ return ret;
+ }
+
+ dev_dbg(rdev_get_dev(rdev),
+ "%s-set_mode (bank, reg, mask, value): "
+ "0x%x, 0x%x, 0x%x, 0x%x\n",
+ info->desc.name, info->update_bank, info->update_reg,
+ info->update_mask, regval);
+ }
+
+ info->update_val = regval;
+
+ return 0;
+}
+
+static unsigned int ab8500_ext_regulator_get_mode(struct regulator_dev *rdev)
+{
+ struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
+ int ret;
+
+ if (info == NULL) {
+ dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
+ return -EINVAL;
+ }
+
+ if (info->update_val == info->update_val_hp)
+ ret = REGULATOR_MODE_NORMAL;
+ else if (info->update_val == info->update_val_lp)
+ ret = REGULATOR_MODE_IDLE;
+ else
+ ret = -EINVAL;
+
+ return ret;
+}
+
+static int ab8500_ext_set_voltage(struct regulator_dev *rdev, int min_uV,
+ int max_uV, unsigned *selector)
+{
+ struct regulation_constraints *regu_constraints = rdev->constraints;
+
+ if (!regu_constraints) {
+ dev_err(rdev_get_dev(rdev), "No regulator constraints\n");
+ return -EINVAL;
+ }
+
+ if (regu_constraints->min_uV == min_uV &&
+ regu_constraints->max_uV == max_uV)
+ return 0;
+
+ dev_err(rdev_get_dev(rdev),
+ "Requested min %duV max %duV != constrained min %duV max %duV\n",
+ min_uV, max_uV,
+ regu_constraints->min_uV, regu_constraints->max_uV);
+
+ return -EINVAL;
+}
+
+static int ab8500_ext_list_voltage(struct regulator_dev *rdev,
+ unsigned selector)
+{
+ struct regulation_constraints *regu_constraints = rdev->constraints;
+
+ if (regu_constraints == NULL) {
+ dev_err(rdev_get_dev(rdev), "regulator constraints null pointer\n");
+ return -EINVAL;
+ }
+ /* return the uV for the fixed regulators */
+ if (regu_constraints->min_uV && regu_constraints->max_uV) {
+ if (regu_constraints->min_uV == regu_constraints->max_uV)
+ return regu_constraints->min_uV;
+ }
+ return -EINVAL;
+}
+
+static struct regulator_ops ab8500_ext_regulator_ops = {
+ .enable = ab8500_ext_regulator_enable,
+ .disable = ab8500_ext_regulator_disable,
+ .is_enabled = ab8500_ext_regulator_is_enabled,
+ .set_mode = ab8500_ext_regulator_set_mode,
+ .get_mode = ab8500_ext_regulator_get_mode,
+ .set_voltage = ab8500_ext_set_voltage,
+ .list_voltage = ab8500_ext_list_voltage,
+};
+
+static struct ab8500_ext_regulator_info
+ ab8500_ext_regulator_info[AB8500_NUM_EXT_REGULATORS] = {
+ [AB8500_EXT_SUPPLY1] = {
+ .desc = {
+ .name = "VEXTSUPPLY1",
+ .ops = &ab8500_ext_regulator_ops,
+ .type = REGULATOR_VOLTAGE,
+ .id = AB8500_EXT_SUPPLY1,
+ .owner = THIS_MODULE,
+ .n_voltages = 1,
+ },
+ .update_bank = 0x04,
+ .update_reg = 0x08,
+ .update_mask = 0x03,
+ .update_val = 0x01,
+ .update_val_hp = 0x01,
+ .update_val_lp = 0x03,
+ .update_val_hw = 0x02,
+ },
+ [AB8500_EXT_SUPPLY2] = {
+ .desc = {
+ .name = "VEXTSUPPLY2",
+ .ops = &ab8500_ext_regulator_ops,
+ .type = REGULATOR_VOLTAGE,
+ .id = AB8500_EXT_SUPPLY2,
+ .owner = THIS_MODULE,
+ .n_voltages = 1,
+ },
+ .update_bank = 0x04,
+ .update_reg = 0x08,
+ .update_mask = 0x0c,
+ .update_val = 0x04,
+ .update_val_hp = 0x04,
+ .update_val_lp = 0x0c,
+ .update_val_hw = 0x08,
+ },
+ [AB8500_EXT_SUPPLY3] = {
+ .desc = {
+ .name = "VEXTSUPPLY3",
+ .ops = &ab8500_ext_regulator_ops,
+ .type = REGULATOR_VOLTAGE,
+ .id = AB8500_EXT_SUPPLY3,
+ .owner = THIS_MODULE,
+ .n_voltages = 1,
+ },
+ .update_bank = 0x04,
+ .update_reg = 0x08,
+ .update_mask = 0x30,
+ .update_val = 0x10,
+ .update_val_hp = 0x10,
+ .update_val_lp = 0x30,
+ .update_val_hw = 0x20,
+ },
+};
+
+static struct of_regulator_match ab8500_ext_regulator_match[] = {
+ { .name = "ab8500_ext1", .driver_data = (void *) AB8500_EXT_SUPPLY1, },
+ { .name = "ab8500_ext2", .driver_data = (void *) AB8500_EXT_SUPPLY2, },
+ { .name = "ab8500_ext3", .driver_data = (void *) AB8500_EXT_SUPPLY3, },
+};
+
+static int ab8500_ext_regulator_probe(struct platform_device *pdev)
+{
+ struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
+ struct ab8500_platform_data *ppdata;
+ struct ab8500_regulator_platform_data *pdata;
+ struct device_node *np = pdev->dev.of_node;
+ struct regulator_config config = { };
+ int i, err;
+
+ if (np) {
+ err = of_regulator_match(&pdev->dev, np,
+ ab8500_ext_regulator_match,
+ ARRAY_SIZE(ab8500_ext_regulator_match));
+ if (err < 0) {
+ dev_err(&pdev->dev,
+ "Error parsing regulator init data: %d\n", err);
+ return err;
+ }
+ }
+
+ if (!ab8500) {
+ dev_err(&pdev->dev, "null mfd parent\n");
+ return -EINVAL;
+ }
+
+ ppdata = dev_get_platdata(ab8500->dev);
+ if (!ppdata) {
+ dev_err(&pdev->dev, "null parent pdata\n");
+ return -EINVAL;
+ }
+
+ pdata = ppdata->regulator;
+ if (!pdata) {
+ dev_err(&pdev->dev, "null pdata\n");
+ return -EINVAL;
+ }
+
+ /* make sure the platform data has the correct size */
+ if (pdata->num_ext_regulator != ARRAY_SIZE(ab8500_ext_regulator_info)) {
+ dev_err(&pdev->dev, "Configuration error: size mismatch.\n");
+ return -EINVAL;
+ }
+
+ /* check for AB8500 2.x */
+ if (is_ab8500_2p0_or_earlier(ab8500)) {
+ struct ab8500_ext_regulator_info *info;
+
+ /* VextSupply3LPn is inverted on AB8500 2.x */
+ info = &ab8500_ext_regulator_info[AB8500_EXT_SUPPLY3];
+ info->update_val = 0x30;
+ info->update_val_hp = 0x30;
+ info->update_val_lp = 0x10;
+ }
+
+ /* register all regulators */
+ for (i = 0; i < ARRAY_SIZE(ab8500_ext_regulator_info); i++) {
+ struct ab8500_ext_regulator_info *info = NULL;
+
+ /* assign per-regulator data */
+ info = &ab8500_ext_regulator_info[i];
+ info->dev = &pdev->dev;
+ info->cfg = (struct ab8500_ext_regulator_cfg *)
+ pdata->ext_regulator[i].driver_data;
+
+ config.dev = &pdev->dev;
+ config.driver_data = info;
+ config.of_node = ab8500_ext_regulator_match[i].of_node;
+ config.init_data = (np) ?
+ ab8500_ext_regulator_match[i].init_data :
+ &pdata->ext_regulator[i];
+
+ /* register regulator with framework */
+ info->rdev = devm_regulator_register(&pdev->dev, &info->desc,
+ &config);
+ if (IS_ERR(info->rdev)) {
+ err = PTR_ERR(info->rdev);
+ dev_err(&pdev->dev, "failed to register regulator %s\n",
+ info->desc.name);
+ return err;
+ }
+
+ dev_dbg(rdev_get_dev(info->rdev),
+ "%s-probed\n", info->desc.name);
+ }
+
+ return 0;
+}
+
+static struct platform_driver ab8500_ext_regulator_driver = {
+ .probe = ab8500_ext_regulator_probe,
+ .driver = {
+ .name = "ab8500-ext-regulator",
+ },
+};
+
+static int __init ab8500_ext_regulator_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&ab8500_ext_regulator_driver);
+ if (ret)
+ pr_err("Failed to register ab8500 ext regulator: %d\n", ret);
+
+ return ret;
+}
+subsys_initcall(ab8500_ext_regulator_init);
+
+static void __exit ab8500_ext_regulator_exit(void)
+{
+ platform_driver_unregister(&ab8500_ext_regulator_driver);
+}
+module_exit(ab8500_ext_regulator_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Bengt Jonsson <bengt.g.jonsson@stericsson.com>");
+MODULE_DESCRIPTION("AB8500 external regulator driver");
+MODULE_ALIAS("platform:ab8500-ext-regulator");
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-19 11:10:30 +0000