--- /dev/null
+/*
+ * LP8752 High Performance Power Management Unit : System Interface Driver
+ *
+ * Author: zhangqing <zhangqing@rock-chips.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/gpio.h>
+#include <linux/regmap.h>
+#include <linux/uaccess.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/regulator/machine.h>
+
+#define LP8752_CTRL_BUCK0 0x02
+#define LP8752_CTRL_BUCK1 0x04
+#define LP8752_CTRL_BUCK2 0x06
+#define LP8752_CTRL_BUCK3 0x08
+
+#define LP8752_VOUT_BUCK0 0x0a
+#define LP8752_VOUT_BUCK1 0x0c
+#define LP8752_VOUT_BUCK2 0x0e
+#define LP8752_VOUT_BUCK3 0x10
+
+#define LP8752_BUCK_VSEL_MASK 0xff
+#define LP8752_REG_MAX 0x2f
+
+enum lp8752_bucks {
+ LP8752_BUCK0 = 0,
+ LP8752_BUCK1,
+ LP8752_BUCK2,
+ LP8752_BUCK3,
+ LP8752_BUCK_MAX,
+};
+
+static const struct regulator_linear_range lp8752_buck_voltage_ranges[] = {
+ REGULATOR_LINEAR_RANGE(500000, 0, 23, 10000),
+ REGULATOR_LINEAR_RANGE(735000, 24, 157, 5000),
+ REGULATOR_LINEAR_RANGE(1420000, 158, 255, 20000),
+};
+
+struct lp8752_platform_data {
+ int nphase;
+ struct device_node *of_node[LP8752_BUCK_MAX];
+ struct regulator_desc desc;
+ struct regulator_init_data *buck_data[LP8752_BUCK_MAX];
+};
+
+struct lp8752_mphase {
+ int nreg;
+ int buck_id[LP8752_BUCK_MAX];
+};
+
+struct lp8752_chip {
+ int nphase;
+ struct device *dev;
+ struct regmap *regmap;
+ struct lp8752_platform_data *pdata;
+ struct regulator_dev *rdev[LP8752_BUCK_MAX];
+};
+
+static int lp8752_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+ struct lp8752_chip *pchip = rdev_get_drvdata(rdev);
+ u8 msk = BIT(1);
+ int ret;
+
+ switch (mode) {
+ case REGULATOR_MODE_FAST:
+ /* forced pwm mode */
+ ret = regmap_update_bits(pchip->regmap,
+ rdev->desc->enable_reg,
+ msk, 0x1);
+ case REGULATOR_MODE_NORMAL:
+ /* automatic pwm/pfm mode */
+ ret = regmap_update_bits(pchip->regmap,
+ rdev->desc->enable_reg,
+ msk, 0x0);
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static unsigned int lp8752_buck_get_mode(struct regulator_dev *rdev)
+{
+ struct lp8752_chip *pchip = rdev_get_drvdata(rdev);
+ int ret;
+ unsigned int reg;
+
+ ret = regmap_read(pchip->regmap, rdev->desc->enable_reg, ®);
+ if (ret < 0) {
+ dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
+ return ret;
+ }
+
+ return (reg & BIT(1)) ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
+}
+
+static struct regulator_ops lp8752_buck_ops = {
+ .map_voltage = regulator_map_voltage_linear_range,
+ .list_voltage = regulator_list_voltage_linear_range,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+ .set_mode = lp8752_buck_set_mode,
+ .get_mode = lp8752_buck_get_mode,
+};
+
+#define lp8752_rail(_id) "lp8752_buck"#_id
+#define vin(_id) "vin"#_id
+
+static const struct lp8752_mphase mphase_buck[] = {
+ { 1, { LP8752_BUCK0} },
+ { 2, { LP8752_BUCK0, LP8752_BUCK3 } },
+ { 3, { LP8752_BUCK0, LP8752_BUCK2, LP8752_BUCK3 } },
+ { 4, { LP8752_BUCK0, LP8752_BUCK1, LP8752_BUCK2, LP8752_BUCK3 } },
+};
+
+static struct of_regulator_match lp8752_reg_matches[] = {
+ { .name = "lp8752_buck0", .driver_data = (void *)0 },
+ { .name = "lp8752_buck1", .driver_data = (void *)1 },
+ { .name = "lp8752_buck2", .driver_data = (void *)2 },
+ { .name = "lp8752_buck3", .driver_data = (void *)3 },
+};
+
+static int lp8752_init_data(struct lp8752_chip *pchip)
+{
+ int icnt, buck_id, count;
+ struct lp8752_platform_data *pdata = pchip->pdata;
+ struct device_node *regs, *lp8752_np;
+
+ lp8752_np = of_node_get(pchip->dev->of_node);
+ if (!lp8752_np) {
+ dev_err(pchip->dev, "Failed to find device node\n");
+ return -ENODEV;
+ }
+
+ regs = of_find_node_by_name(lp8752_np, "regulators");
+ if (!regs)
+ return -ENODEV;
+
+ count = of_regulator_match(pchip->dev, regs, lp8752_reg_matches,
+ LP8752_BUCK_MAX);
+ of_node_put(regs);
+ if ((count <= 0) || (count > LP8752_BUCK_MAX))
+ return -ENODEV;
+
+ pchip->nphase = (count - 1) & 0xf;
+
+ /* set default data based on multi-phase config */
+ for (icnt = 0; icnt < mphase_buck[pchip->nphase].nreg; icnt++) {
+ buck_id = mphase_buck[pchip->nphase].buck_id[icnt];
+ pdata->buck_data[buck_id] =
+ lp8752_reg_matches[buck_id].init_data;
+ pdata->of_node[buck_id] = lp8752_reg_matches[buck_id].of_node;
+ }
+
+ return 0;
+}
+
+#define lp8752_buck_desc(_id)\
+{\
+ .name = lp8752_rail(_id),\
+ .id = LP8752_BUCK##_id,\
+ .supply_name = vin(_id),\
+ .ops = &lp8752_buck_ops,\
+ .n_voltages = LP8752_BUCK_VSEL_MASK + 1,\
+ .linear_ranges = lp8752_buck_voltage_ranges,\
+ .n_linear_ranges = ARRAY_SIZE(lp8752_buck_voltage_ranges),\
+ .type = REGULATOR_VOLTAGE,\
+ .enable_reg = LP8752_CTRL_BUCK##_id,\
+ .enable_mask = BIT(7),\
+ .vsel_reg = LP8752_VOUT_BUCK##_id,\
+ .vsel_mask = LP8752_BUCK_VSEL_MASK,\
+ .enable_time = 400,\
+ .owner = THIS_MODULE,\
+}
+
+static struct regulator_desc lp8752_reg_desc[] = {
+ lp8752_buck_desc(0),
+ lp8752_buck_desc(1),
+ lp8752_buck_desc(2),
+ lp8752_buck_desc(3),
+};
+
+static int lp8752_regulator_init(struct lp8752_chip *pchip)
+{
+ int ret, icnt, buck_id;
+ struct lp8752_platform_data *pdata = pchip->pdata;
+ struct regulator_config rconfig = { };
+
+ rconfig.regmap = pchip->regmap;
+ rconfig.dev = pchip->dev;
+ rconfig.driver_data = pchip;
+
+ for (icnt = 0; icnt < mphase_buck[pchip->nphase].nreg; icnt++) {
+ buck_id = mphase_buck[pchip->nphase].buck_id[icnt];
+ rconfig.init_data = pdata->buck_data[buck_id];
+ rconfig.of_node = pdata->of_node[buck_id];
+ pchip->rdev[buck_id] =
+ devm_regulator_register(pchip->dev,
+ &lp8752_reg_desc[buck_id],
+ &rconfig);
+ if (IS_ERR(pchip->rdev[buck_id])) {
+ ret = PTR_ERR(pchip->rdev[buck_id]);
+ pchip->rdev[buck_id] = NULL;
+ dev_err(pchip->dev, "regulator init failed: buck %d\n",
+ buck_id);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static const struct regmap_config lp8752_regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = LP8752_REG_MAX,
+};
+
+static int lp8752_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ int ret;
+ struct lp8752_chip *pchip;
+ struct lp8752_platform_data *pdata = dev_get_platdata(&client->dev);
+
+ pchip = devm_kzalloc(&client->dev,
+ sizeof(struct lp8752_chip), GFP_KERNEL);
+ if (!pchip)
+ return -ENOMEM;
+
+ pchip->dev = &client->dev;
+ pchip->regmap = devm_regmap_init_i2c(client, &lp8752_regmap);
+ if (IS_ERR(pchip->regmap)) {
+ ret = PTR_ERR(pchip->regmap);
+ dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
+ return ret;
+ }
+ i2c_set_clientdata(client, pchip);
+
+ ret = regmap_update_bits(pchip->regmap,
+ LP8752_CTRL_BUCK0,
+ (1 << 0), 0x1);
+ ret = regmap_update_bits(pchip->regmap,
+ LP8752_CTRL_BUCK2,
+ (1 << 0), 0x1);
+
+ if (!pdata) {
+ pchip->pdata = devm_kzalloc(pchip->dev,
+ sizeof(struct lp8752_platform_data),
+ GFP_KERNEL);
+ if (!pchip->pdata)
+ return -ENOMEM;
+
+ ret = lp8752_init_data(pchip);
+ if (ret < 0) {
+ dev_err(&client->dev, "fail to initialize chip\n");
+ return ret;
+ }
+ } else {
+ pchip->pdata = pdata;
+ pchip->nphase = pdata->nphase;
+ }
+
+ lp8752_regulator_init(pchip);
+
+ return 0;
+}
+
+static const struct of_device_id lp8752_of_match[] = {
+ { .compatible = "ti,lp8752", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, lp8752_of_match);
+
+static const struct i2c_device_id lp8752_id[] = {
+ {"lp8752", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, lp8752_id);
+
+static struct i2c_driver lp8752_i2c_driver = {
+ .probe = lp8752_probe,
+ .id_table = lp8752_id,
+ .driver = {
+ .name = "lp8752",
+ .of_match_table = of_match_ptr(lp8752_of_match),
+ },
+};
+
+module_i2c_driver(lp8752_i2c_driver);
+
+MODULE_DESCRIPTION("Texas Instruments lp8752 driver");
+MODULE_AUTHOR("Zhang Qing <zhangqing@rock-chips.com>");
+MODULE_LICENSE("GPL v2");
projects / firefly-linux-kernel-4.4.55.git / commitdiff