1 // SPDX-License-Identifier: GPL-2.0-or-later 2 // 3 // Copyright (C) 2018 ROHM Semiconductors 4 // 5 // ROHM BD71837MWV PMIC driver 6 // 7 // Datasheet available from 8 // https://www.rohm.com/datasheet/BD71837MWV/bd71837mwv-e 9 10 #include <linux/i2c.h> 11 #include <linux/input.h> 12 #include <linux/interrupt.h> 13 #include <linux/mfd/rohm-bd718x7.h> 14 #include <linux/mfd/core.h> 15 #include <linux/module.h> 16 #include <linux/regmap.h> 17 18 /* 19 * gpio_keys.h requires definiton of bool. It is brought in 20 * by above includes. Keep this as last until gpio_keys.h gets fixed. 21 */ 22 #include <linux/gpio_keys.h> 23 24 static const u8 supported_revisions[] = { 0xA2 /* BD71837 */ }; 25 26 static struct gpio_keys_button button = { 27 .code = KEY_POWER, 28 .gpio = -1, 29 .type = EV_KEY, 30 }; 31 32 static struct gpio_keys_platform_data bd718xx_powerkey_data = { 33 .buttons = &button, 34 .nbuttons = 1, 35 .name = "bd718xx-pwrkey", 36 }; 37 38 static struct mfd_cell bd71837_mfd_cells[] = { 39 { 40 .name = "gpio-keys", 41 .platform_data = &bd718xx_powerkey_data, 42 .pdata_size = sizeof(bd718xx_powerkey_data), 43 }, 44 { .name = "bd71837-clk", }, 45 { .name = "bd71837-pmic", }, 46 }; 47 48 static const struct regmap_irq bd71837_irqs[] = { 49 REGMAP_IRQ_REG(BD71837_INT_SWRST, 0, BD71837_INT_SWRST_MASK), 50 REGMAP_IRQ_REG(BD71837_INT_PWRBTN_S, 0, BD71837_INT_PWRBTN_S_MASK), 51 REGMAP_IRQ_REG(BD71837_INT_PWRBTN_L, 0, BD71837_INT_PWRBTN_L_MASK), 52 REGMAP_IRQ_REG(BD71837_INT_PWRBTN, 0, BD71837_INT_PWRBTN_MASK), 53 REGMAP_IRQ_REG(BD71837_INT_WDOG, 0, BD71837_INT_WDOG_MASK), 54 REGMAP_IRQ_REG(BD71837_INT_ON_REQ, 0, BD71837_INT_ON_REQ_MASK), 55 REGMAP_IRQ_REG(BD71837_INT_STBY_REQ, 0, BD71837_INT_STBY_REQ_MASK), 56 }; 57 58 static struct regmap_irq_chip bd71837_irq_chip = { 59 .name = "bd71837-irq", 60 .irqs = bd71837_irqs, 61 .num_irqs = ARRAY_SIZE(bd71837_irqs), 62 .num_regs = 1, 63 .irq_reg_stride = 1, 64 .status_base = BD71837_REG_IRQ, 65 .mask_base = BD71837_REG_MIRQ, 66 .ack_base = BD71837_REG_IRQ, 67 .init_ack_masked = true, 68 .mask_invert = false, 69 }; 70 71 static const struct regmap_range pmic_status_range = { 72 .range_min = BD71837_REG_IRQ, 73 .range_max = BD71837_REG_POW_STATE, 74 }; 75 76 static const struct regmap_access_table volatile_regs = { 77 .yes_ranges = &pmic_status_range, 78 .n_yes_ranges = 1, 79 }; 80 81 static const struct regmap_config bd71837_regmap_config = { 82 .reg_bits = 8, 83 .val_bits = 8, 84 .volatile_table = &volatile_regs, 85 .max_register = BD71837_MAX_REGISTER - 1, 86 .cache_type = REGCACHE_RBTREE, 87 }; 88 89 static int bd71837_i2c_probe(struct i2c_client *i2c, 90 const struct i2c_device_id *id) 91 { 92 struct bd71837 *bd71837; 93 int ret, i; 94 unsigned int val; 95 96 bd71837 = devm_kzalloc(&i2c->dev, sizeof(struct bd71837), GFP_KERNEL); 97 98 if (!bd71837) 99 return -ENOMEM; 100 101 bd71837->chip_irq = i2c->irq; 102 103 if (!bd71837->chip_irq) { 104 dev_err(&i2c->dev, "No IRQ configured\n"); 105 return -EINVAL; 106 } 107 108 bd71837->dev = &i2c->dev; 109 dev_set_drvdata(&i2c->dev, bd71837); 110 111 bd71837->regmap = devm_regmap_init_i2c(i2c, &bd71837_regmap_config); 112 if (IS_ERR(bd71837->regmap)) { 113 dev_err(&i2c->dev, "regmap initialization failed\n"); 114 return PTR_ERR(bd71837->regmap); 115 } 116 117 ret = regmap_read(bd71837->regmap, BD71837_REG_REV, &val); 118 if (ret) { 119 dev_err(&i2c->dev, "Read BD71837_REG_DEVICE failed\n"); 120 return ret; 121 } 122 for (i = 0; i < ARRAY_SIZE(supported_revisions); i++) 123 if (supported_revisions[i] == val) 124 break; 125 126 if (i == ARRAY_SIZE(supported_revisions)) { 127 dev_err(&i2c->dev, "Unsupported chip revision\n"); 128 return -ENODEV; 129 } 130 131 ret = devm_regmap_add_irq_chip(&i2c->dev, bd71837->regmap, 132 bd71837->chip_irq, IRQF_ONESHOT, 0, 133 &bd71837_irq_chip, &bd71837->irq_data); 134 if (ret) { 135 dev_err(&i2c->dev, "Failed to add irq_chip\n"); 136 return ret; 137 } 138 139 /* Configure short press to 10 milliseconds */ 140 ret = regmap_update_bits(bd71837->regmap, 141 BD71837_REG_PWRONCONFIG0, 142 BD718XX_PWRBTN_PRESS_DURATION_MASK, 143 BD718XX_PWRBTN_SHORT_PRESS_10MS); 144 if (ret) { 145 dev_err(&i2c->dev, 146 "Failed to configure button short press timeout\n"); 147 return ret; 148 } 149 150 /* Configure long press to 10 seconds */ 151 ret = regmap_update_bits(bd71837->regmap, 152 BD71837_REG_PWRONCONFIG1, 153 BD718XX_PWRBTN_PRESS_DURATION_MASK, 154 BD718XX_PWRBTN_LONG_PRESS_10S); 155 156 if (ret) { 157 dev_err(&i2c->dev, 158 "Failed to configure button long press timeout\n"); 159 return ret; 160 } 161 162 ret = regmap_irq_get_virq(bd71837->irq_data, BD71837_INT_PWRBTN_S); 163 164 if (ret < 0) { 165 dev_err(&i2c->dev, "Failed to get the IRQ\n"); 166 return ret; 167 } 168 169 button.irq = ret; 170 171 ret = devm_mfd_add_devices(bd71837->dev, PLATFORM_DEVID_AUTO, 172 bd71837_mfd_cells, 173 ARRAY_SIZE(bd71837_mfd_cells), NULL, 0, 174 regmap_irq_get_domain(bd71837->irq_data)); 175 if (ret) 176 dev_err(&i2c->dev, "Failed to create subdevices\n"); 177 178 return ret; 179 } 180 181 static const struct of_device_id bd71837_of_match[] = { 182 { .compatible = "rohm,bd71837", }, 183 { } 184 }; 185 MODULE_DEVICE_TABLE(of, bd71837_of_match); 186 187 static struct i2c_driver bd71837_i2c_driver = { 188 .driver = { 189 .name = "rohm-bd718x7", 190 .of_match_table = bd71837_of_match, 191 }, 192 .probe = bd71837_i2c_probe, 193 }; 194 195 static int __init bd71837_i2c_init(void) 196 { 197 return i2c_add_driver(&bd71837_i2c_driver); 198 } 199 200 /* Initialise early so consumer devices can complete system boot */ 201 subsys_initcall(bd71837_i2c_init); 202 203 static void __exit bd71837_i2c_exit(void) 204 { 205 i2c_del_driver(&bd71837_i2c_driver); 206 } 207 module_exit(bd71837_i2c_exit); 208 209 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>"); 210 MODULE_DESCRIPTION("ROHM BD71837 Power Management IC driver"); 211 MODULE_LICENSE("GPL"); 212