/* * max77833.c - Regulator driver for the Maxim 77833 * * Copyright (C) 2011 Samsung Electronics * Sukdong Kim * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * This driver is based on max8997.c */ #include #include #include #include #include #include #include #include #include #include #include #include /* MAX77833 regulator IDs */ enum max77833_regulators { MAX77833_SAFEOUT1 = 0, MAX77833_SAFEOUT2, MAX77833_REG_MAX, }; struct max77833_data { struct device *dev; struct max77833_dev *iodev; int num_regulators; struct regulator_dev **rdev; u8 saved_states[MAX77833_REG_MAX]; }; struct voltage_map_desc { int min; int max; int step; unsigned int n_bits; }; /* current map in mA */ static const struct voltage_map_desc charger_current_map_desc = { .min = 60, .max = 2580, .step = 20, .n_bits = 7, }; static const struct voltage_map_desc topoff_current_map_desc = { .min = 50, .max = 200, .step = 10, .n_bits = 4, }; static const struct voltage_map_desc *reg_voltage_map[] = { [MAX77833_SAFEOUT1] = NULL, [MAX77833_SAFEOUT2] = NULL, }; int max77833_regulator_update_reg (struct i2c_client *i2c, u8 reg, u8 val, u8 mask) { u8 val_before = -1, val_after = -1; int ret; max77833_read_reg(i2c, reg, &val_before); ret = max77833_update_reg(i2c, reg, val, mask); if (ret) pr_err("%s: fail to update reg(%d)\n", __func__, ret); max77833_read_reg(i2c, reg, &val_after); pr_info("%s: reg(0x%02x): [0x%02x]+[0x%02x]:[mask 0x%02x]->[0x%02x]\n", __func__, reg, val_before, val, mask, val_after); return ret; } static inline int max77833_get_rid(struct regulator_dev *rdev) { if (!rdev) return -ENODEV; if (!rdev->desc) return -ENODEV; dev_info(&rdev->dev, "func:%s\n", __func__); return rdev_get_id(rdev); } static bool max77833_regulator_check_disable(struct regulator_dev *rdev) { int rid = max77833_get_rid(rdev); bool ret = false; switch(rid) { case MAX77833_SAFEOUT1: ret = is_muic_usb_path_ap_usb(); break; case MAX77833_SAFEOUT2: ret = is_muic_usb_path_cp_usb(); break; default: pr_err("%s: invalid value rid(%d)\n", __func__, rid); break; } if (ret) { pr_info("%s: cannot disable regulator(%d)\n", __func__, rid); return false; } return true; } static int max77833_list_voltage_safeout(struct regulator_dev *rdev, unsigned int selector) { int rid = max77833_get_rid(rdev); dev_info(&rdev->dev, "func:%s\n", __func__); if (rid == MAX77833_SAFEOUT1 || rid == MAX77833_SAFEOUT2) { switch (selector) { case 0: return 4850000; case 1: return 4900000; case 2: return 4950000; case 3: return 3300000; default: return -EINVAL; } } return -EINVAL; } static int max77833_get_enable_register(struct regulator_dev *rdev, int *reg, int *mask, int *pattern) { int rid = max77833_get_rid(rdev); dev_info(&rdev->dev, "func:%s\n", __func__); switch (rid) { case MAX77833_SAFEOUT1...MAX77833_SAFEOUT2: *reg = MAX77833_PMIC_REG_SAFEOUT_CTRL; *mask = 0x40 << (rid - MAX77833_SAFEOUT1); *pattern = 0x40 << (rid - MAX77833_SAFEOUT1); break; default: /* Not controllable or not exists */ return -EINVAL; } return 0; } static int max77833_get_disable_register(struct regulator_dev *rdev, int *reg, int *mask, int *pattern) { int rid = max77833_get_rid(rdev); dev_info(&rdev->dev, "func:%s\n", __func__); switch (rid) { case MAX77833_SAFEOUT1...MAX77833_SAFEOUT2: *reg = MAX77833_PMIC_REG_SAFEOUT_CTRL; *mask = 0x40 << (rid - MAX77833_SAFEOUT1); *pattern = 0x00; break; default: /* Not controllable or not exists */ return -EINVAL; } return 0; } static int max77833_reg_is_enabled(struct regulator_dev *rdev) { struct max77833_data *max77833 = rdev_get_drvdata(rdev); struct i2c_client *i2c = max77833->iodev->i2c; int ret, reg, mask, pattern; u8 val; dev_info(&rdev->dev, "func:%s\n", __func__); ret = max77833_get_enable_register(rdev, ®, &mask, &pattern); if (ret == -EINVAL) return 1; /* "not controllable" */ else if (ret) return ret; ret = max77833_read_reg(i2c, reg, &val); if (ret) return ret; return (val & mask) == pattern; } static int max77833_reg_enable(struct regulator_dev *rdev) { struct max77833_data *max77833 = rdev_get_drvdata(rdev); struct i2c_client *i2c = max77833->iodev->i2c; int ret, reg, mask, pattern; dev_info(&rdev->dev, "func:%s\n", __func__); ret = max77833_get_enable_register(rdev, ®, &mask, &pattern); if (ret) return ret; return max77833_regulator_update_reg(i2c, reg, pattern, mask); } static int max77833_reg_disable(struct regulator_dev *rdev) { struct max77833_data *max77833 = rdev_get_drvdata(rdev); struct i2c_client *i2c = max77833->iodev->i2c; int ret, reg, mask, pattern; dev_info(&rdev->dev, "func:%s\n", __func__); if (!max77833_regulator_check_disable(rdev)) return -EINVAL; ret = max77833_get_disable_register(rdev, ®, &mask, &pattern); if (ret) return ret; return max77833_regulator_update_reg(i2c, reg, pattern, mask); } static int max77833_get_voltage_register(struct regulator_dev *rdev, int *_reg, int *_shift, int *_mask) { int rid; int reg, shift = 0, mask = 0x3f; if (!rdev) return -EINVAL; rid = max77833_get_rid(rdev); dev_info(&rdev->dev, "func:%s\n", __func__); switch (rid) { case MAX77833_SAFEOUT1...MAX77833_SAFEOUT2: reg = MAX77833_PMIC_REG_SAFEOUT_CTRL; shift = (rid == MAX77833_SAFEOUT2) ? 2 : 0; mask = 0x3; break; default: pr_err("%s: invalid value(%d)\n", __func__, rid); return -EINVAL; } *_reg = reg; *_shift = shift; *_mask = mask; return 0; } static int max77833_list_voltage(struct regulator_dev *rdev, unsigned int selector) { const struct voltage_map_desc *desc; int rid = max77833_get_rid(rdev); int val; dev_info(&rdev->dev, "func:%s\n", __func__); if (rid >= ARRAY_SIZE(reg_voltage_map) || rid < 0) return -EINVAL; desc = reg_voltage_map[rid]; if (desc == NULL) return -EINVAL; val = desc->min + desc->step * selector; if (val > desc->max) return -EINVAL; return val * 1000; } static int max77833_get_voltage(struct regulator_dev *rdev) { struct max77833_data *max77833; struct i2c_client *i2c; int reg, shift, mask, ret; u8 val; if (!rdev) return -1; max77833 = rdev_get_drvdata(rdev); i2c = max77833->iodev->i2c; dev_info(&rdev->dev, "func:%s\n", __func__); ret = max77833_get_voltage_register(rdev, ®, &shift, &mask); if (ret) return ret; ret = max77833_read_reg(i2c, reg, &val); if (ret) return ret; val >>= shift; val &= mask; if (rdev->desc && rdev->desc->ops && rdev->desc->ops->list_voltage) return rdev->desc->ops->list_voltage(rdev, val); /* * max77833_list_voltage returns value for any rdev with voltage_map, * which works for "CHARGER" and "CHARGER TOPOFF" that do not have * list_voltage ops (they are current regulators). */ return max77833_list_voltage(rdev, val); } static inline int max77833_get_voltage_proper_val( const struct voltage_map_desc *desc, int min_vol, int max_vol) { int i = 0; if (desc == NULL) return -EINVAL; if (max_vol < desc->min || min_vol > desc->max) return -EINVAL; while (desc->min + desc->step * i < min_vol && desc->min + desc->step * i < desc->max) i++; if (desc->min + desc->step * i > max_vol) return -EINVAL; if (i >= (1 << desc->n_bits)) return -EINVAL; return i; } static const int safeoutvolt[] = { 3300000, 4850000, 4900000, 4950000, }; /* For SAFEOUT1 and SAFEOUT2 */ static int max77833_set_voltage_safeout(struct regulator_dev *rdev, int min_uV, int max_uV, unsigned *selector) { struct max77833_data *max77833 = rdev_get_drvdata(rdev); struct i2c_client *i2c = max77833->iodev->i2c; int rid = max77833_get_rid(rdev); int reg, shift = 0, mask, ret; int i = 0; u8 val; dev_info(&rdev->dev, "func:%s\n", __func__); if (rid != MAX77833_SAFEOUT1 && rid != MAX77833_SAFEOUT2) return -EINVAL; for (i = 0; i < ARRAY_SIZE(safeoutvolt); i++) { if (min_uV <= safeoutvolt[i] && max_uV >= safeoutvolt[i]) break; } if (i >= ARRAY_SIZE(safeoutvolt)) return -EINVAL; if (i == 0) val = 0x3; else val = i - 1; ret = max77833_get_voltage_register(rdev, ®, &shift, &mask); if (ret) return ret; ret = max77833_regulator_update_reg(i2c, reg, val << shift, mask << shift); *selector = val; return ret; } static int max77833_reg_enable_suspend(struct regulator_dev *rdev) { dev_info(&rdev->dev, "func:%s\n", __func__); return 0; } static int max77833_reg_disable_suspend(struct regulator_dev *rdev) { struct max77833_data *max77833 = rdev_get_drvdata(rdev); struct i2c_client *i2c = max77833->iodev->i2c; int ret, reg, mask, pattern; int rid = max77833_get_rid(rdev); dev_info(&rdev->dev, "func:%s\n", __func__); ret = max77833_get_disable_register(rdev, ®, &mask, &pattern); if (ret) return ret; if (rid != MAX77833_SAFEOUT1 && rid != MAX77833_SAFEOUT2) return -EINVAL; max77833_read_reg(i2c, reg, &max77833->saved_states[rid]); dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n", rdev->desc->name, max77833->saved_states[rid] & mask, (~pattern) & mask); return max77833_regulator_update_reg(i2c, reg, pattern, mask); } static struct regulator_ops max77833_safeout_ops = { .list_voltage = max77833_list_voltage_safeout, .is_enabled = max77833_reg_is_enabled, .enable = max77833_reg_enable, .disable = max77833_reg_disable, .get_voltage = max77833_get_voltage, .set_voltage = max77833_set_voltage_safeout, .set_suspend_enable = max77833_reg_enable_suspend, .set_suspend_disable = max77833_reg_disable_suspend, }; static struct regulator_desc regulators[] = { { .name = "ESAFEOUT1", .id = MAX77833_SAFEOUT1, .ops = &max77833_safeout_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, { .name = "ESAFEOUT2", .id = MAX77833_SAFEOUT2, .ops = &max77833_safeout_ops, .type = REGULATOR_VOLTAGE, .owner = THIS_MODULE, }, }; static struct regulator_consumer_supply safeout1_supply[] = { REGULATOR_SUPPLY("safeout1", NULL), }; static struct regulator_consumer_supply safeout2_supply[] = { REGULATOR_SUPPLY("safeout2", NULL), }; #if defined(CONFIG_OF) #define max77833_init_consumer_supplies(p_data, r_init_data, id) \ (r_init_data) = (p_data)->regulators[MAX77833_SAFEOUT##id].initdata; \ (r_init_data)->constraints.state_mem.enabled = 1; \ (r_init_data)->num_consumer_supplies = ARRAY_SIZE(safeout## id ##_supply); \ (r_init_data)->consumer_supplies = safeout## id ##_supply; static int max77833_pmic_dt_parse_pdata(struct platform_device *pdev, struct max77833_platform_data *pdata) { struct max77833_dev *iodev = dev_get_drvdata(pdev->dev.parent); struct device_node *pmic_np, *regulators_np, *reg_np; struct max77833_regulator_data *rdata; struct regulator_init_data *r_initdata; unsigned int i; pmic_np = of_node_get(iodev->dev->of_node); if (!pmic_np) { dev_err(&pdev->dev, "could not find pmic sub-node\n"); return -ENODEV; } regulators_np = of_find_node_by_name(pmic_np, "regulators"); if (!regulators_np) { dev_err(&pdev->dev, "could not find regulators sub-node\n"); return -EINVAL; } /* count the number of regulators to be supported in pmic */ pdata->num_regulators = 0; for_each_child_of_node(regulators_np, reg_np) { pdata->num_regulators++; } rdata = devm_kzalloc(&pdev->dev, sizeof(*rdata) * pdata->num_regulators, GFP_KERNEL); if (!rdata) { of_node_put(regulators_np); dev_err(&pdev->dev, "could not allocate memory for regulator data\n"); return -ENOMEM; } pdata->regulators = rdata; for_each_child_of_node(regulators_np, reg_np) { for (i = 0; i < ARRAY_SIZE(regulators); i++) { if (!of_node_cmp(reg_np->name, regulators[i].name)) break; } if (i == ARRAY_SIZE(regulators)) { dev_warn(&pdev->dev, "don't know how to configure regulator %s\n", reg_np->name); continue; } rdata->id = i; rdata->initdata = of_get_regulator_init_data(&pdev->dev, reg_np); rdata->reg_node = reg_np; rdata++; } of_node_put(regulators_np); /* original shelve source */ max77833_init_consumer_supplies(pdata, r_initdata, 1); max77833_init_consumer_supplies(pdata, r_initdata, 2); return 0; } #else static int max77833_pmic_dt_parse_pdata(struct platform_device *pdev, struct max77833_platform_data *pdata) { return 0; } #endif /* CONFIG_OF */ static __devinit int max77833_pmic_probe(struct platform_device *pdev) { struct max77833_dev *iodev = dev_get_drvdata(pdev->dev.parent); struct max77833_platform_data *pdata = dev_get_platdata(iodev->dev); struct regulator_config config = { }; struct regulator_dev **rdev; struct max77833_data *max77833; struct i2c_client *i2c; int i, ret, size; dev_info(&pdev->dev, "%s\n", __func__); if (!pdata) { pr_info("[%s:%d] !pdata\n", __FILE__, __LINE__); dev_err(pdev->dev.parent, "No platform init data supplied.\n"); return -ENODEV; } if (iodev->dev->of_node) { ret = max77833_pmic_dt_parse_pdata(pdev, pdata); if (ret) return ret; } max77833 = devm_kzalloc(&pdev->dev, sizeof(struct max77833_data), GFP_KERNEL); if (!max77833) { pr_info("[%s:%d] if (!max77833)\n", __FILE__, __LINE__); return -ENOMEM; } size = sizeof(struct regulator_dev *) * pdata->num_regulators; max77833->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL); if (!max77833->rdev) { pr_info("[%s:%d] if (!max77833->rdev)\n", __FILE__, __LINE__); kfree(max77833); return -ENOMEM; } rdev = max77833->rdev; max77833->dev = &pdev->dev; max77833->iodev = iodev; max77833->num_regulators = pdata->num_regulators; platform_set_drvdata(pdev, max77833); i2c = max77833->iodev->i2c; pr_info("[%s:%d] pdata->num_regulators:%d\n", __FILE__, __LINE__, pdata->num_regulators); for (i = 0; i < pdata->num_regulators; i++) { const struct voltage_map_desc *desc; int id = pdata->regulators[i].id; pr_info("[%s:%d] for in pdata->num_regulators:%d\n", __FILE__, __LINE__, pdata->num_regulators); desc = reg_voltage_map[id]; if (id == MAX77833_SAFEOUT1 || id == MAX77833_SAFEOUT2) regulators[id].n_voltages = ARRAY_SIZE(safeoutvolt); config.dev = max77833->dev; config.init_data = pdata->regulators[i].initdata; config.driver_data = max77833; config.of_node = pdata->regulators[i].reg_node; rdev[i] = regulator_register(®ulators[id], &config); if (IS_ERR(rdev[i])) { ret = PTR_ERR(rdev[i]); dev_err(max77833->dev, "regulator init failed for %d\n", id); rdev[i] = NULL; goto err; } } return 0; err: pr_info("[%s:%d] err:\n", __FILE__, __LINE__); for (i = 0; i < max77833->num_regulators; i++) if (rdev[i]) regulator_unregister(rdev[i]); kfree(max77833); return ret; } static int __devexit max77833_pmic_remove(struct platform_device *pdev) { struct max77833_data *max77833 = platform_get_drvdata(pdev); struct regulator_dev **rdev = max77833->rdev; int i; dev_info(&pdev->dev, "%s\n", __func__); for (i = 0; i < max77833->num_regulators; i++) if (rdev[i]) regulator_unregister(rdev[i]); kfree(max77833->rdev); kfree(max77833); return 0; } static const struct platform_device_id max77833_pmic_id[] = { {"max77833-safeout", 0}, {}, }; MODULE_DEVICE_TABLE(platform, max77833_pmic_id); static struct platform_driver max77833_pmic_driver = { .driver = { .name = "max77833-safeout", .owner = THIS_MODULE, }, .probe = max77833_pmic_probe, .remove = __devexit_p(max77833_pmic_remove), .id_table = max77833_pmic_id, }; static int __init max77833_pmic_init(void) { return platform_driver_register(&max77833_pmic_driver); } subsys_initcall(max77833_pmic_init); static void __exit max77833_pmic_cleanup(void) { platform_driver_unregister(&max77833_pmic_driver); } module_exit(max77833_pmic_cleanup); MODULE_DESCRIPTION("MAXIM 77833 Regulator Driver"); MODULE_AUTHOR("Sukdong Kim "); MODULE_LICENSE("GPL");