drivers/mfd/rohm-bd718x7.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 //
0003 // Copyright (C) 2018 ROHM Semiconductors
0004 //
0005 // ROHM BD71837MWV and BD71847MWV PMIC driver
0006 //
0007 // Datasheet for BD71837MWV available from
0008 // https://www.rohm.com/datasheet/BD71837MWV/bd71837mwv-e
0009
0010 #include <linux/gpio_keys.h>
0011 #include <linux/i2c.h>
0012 #include <linux/input.h>
0013 #include <linux/interrupt.h>
0014 #include <linux/mfd/rohm-bd718x7.h>
0015 #include <linux/mfd/core.h>
0016 #include <linux/module.h>
0017 #include <linux/of_device.h>
0018 #include <linux/regmap.h>
0019 #include <linux/types.h>
0020
0021 static struct gpio_keys_button button = {
0022     .code = KEY_POWER,
0023     .gpio = -1,
0024     .type = EV_KEY,
0025 };
0026
0027 static struct gpio_keys_platform_data bd718xx_powerkey_data = {
0028     .buttons = &button,
0029     .nbuttons = 1,
0030     .name = "bd718xx-pwrkey",
0031 };
0032
0033 static struct mfd_cell bd71837_mfd_cells[] = {
0034     {
0035         .name = "gpio-keys",
0036         .platform_data = &bd718xx_powerkey_data,
0037         .pdata_size = sizeof(bd718xx_powerkey_data),
0038     },
0039     { .name = "bd71837-clk", },
0040     { .name = "bd71837-pmic", },
0041 };
0042
0043 static struct mfd_cell bd71847_mfd_cells[] = {
0044     {
0045         .name = "gpio-keys",
0046         .platform_data = &bd718xx_powerkey_data,
0047         .pdata_size = sizeof(bd718xx_powerkey_data),
0048     },
0049     { .name = "bd71847-clk", },
0050     { .name = "bd71847-pmic", },
0051 };
0052
0053 static const struct regmap_irq bd718xx_irqs[] = {
0054     REGMAP_IRQ_REG(BD718XX_INT_SWRST, 0, BD718XX_INT_SWRST_MASK),
0055     REGMAP_IRQ_REG(BD718XX_INT_PWRBTN_S, 0, BD718XX_INT_PWRBTN_S_MASK),
0056     REGMAP_IRQ_REG(BD718XX_INT_PWRBTN_L, 0, BD718XX_INT_PWRBTN_L_MASK),
0057     REGMAP_IRQ_REG(BD718XX_INT_PWRBTN, 0, BD718XX_INT_PWRBTN_MASK),
0058     REGMAP_IRQ_REG(BD718XX_INT_WDOG, 0, BD718XX_INT_WDOG_MASK),
0059     REGMAP_IRQ_REG(BD718XX_INT_ON_REQ, 0, BD718XX_INT_ON_REQ_MASK),
0060     REGMAP_IRQ_REG(BD718XX_INT_STBY_REQ, 0, BD718XX_INT_STBY_REQ_MASK),
0061 };
0062
0063 static struct regmap_irq_chip bd718xx_irq_chip = {
0064     .name = "bd718xx-irq",
0065     .irqs = bd718xx_irqs,
0066     .num_irqs = ARRAY_SIZE(bd718xx_irqs),
0067     .num_regs = 1,
0068     .irq_reg_stride = 1,
0069     .status_base = BD718XX_REG_IRQ,
0070     .mask_base = BD718XX_REG_MIRQ,
0071     .ack_base = BD718XX_REG_IRQ,
0072     .init_ack_masked = true,
0073     .mask_invert = false,
0074 };
0075
0076 static const struct regmap_range pmic_status_range = {
0077     .range_min = BD718XX_REG_IRQ,
0078     .range_max = BD718XX_REG_POW_STATE,
0079 };
0080
0081 static const struct regmap_access_table volatile_regs = {
0082     .yes_ranges = &pmic_status_range,
0083     .n_yes_ranges = 1,
0084 };
0085
0086 static const struct regmap_config bd718xx_regmap_config = {
0087     .reg_bits = 8,
0088     .val_bits = 8,
0089     .volatile_table = &volatile_regs,
0090     .max_register = BD718XX_MAX_REGISTER - 1,
0091     .cache_type = REGCACHE_RBTREE,
0092 };
0093
0094 static int bd718xx_init_press_duration(struct regmap *regmap,
0095                        struct device *dev)
0096 {
0097     u32 short_press_ms, long_press_ms;
0098     u32 short_press_value, long_press_value;
0099     int ret;
0100
0101     ret = of_property_read_u32(dev->of_node, "rohm,short-press-ms",
0102                    &short_press_ms);
0103     if (!ret) {
0104         short_press_value = min(15u, (short_press_ms + 250) / 500);
0105         ret = regmap_update_bits(regmap, BD718XX_REG_PWRONCONFIG0,
0106                      BD718XX_PWRBTN_PRESS_DURATION_MASK,
0107                      short_press_value);
0108         if (ret) {
0109             dev_err(dev, "Failed to init pwron short press\n");
0110             return ret;
0111         }
0112     }
0113
0114     ret = of_property_read_u32(dev->of_node, "rohm,long-press-ms",
0115                    &long_press_ms);
0116     if (!ret) {
0117         long_press_value = min(15u, (long_press_ms + 500) / 1000);
0118         ret = regmap_update_bits(regmap, BD718XX_REG_PWRONCONFIG1,
0119                      BD718XX_PWRBTN_PRESS_DURATION_MASK,
0120                      long_press_value);
0121         if (ret) {
0122             dev_err(dev, "Failed to init pwron long press\n");
0123             return ret;
0124         }
0125     }
0126
0127     return 0;
0128 }
0129
0130 static int bd718xx_i2c_probe(struct i2c_client *i2c,
0131                 const struct i2c_device_id *id)
0132 {
0133     struct regmap *regmap;
0134     struct regmap_irq_chip_data *irq_data;
0135     int ret;
0136     unsigned int chip_type;
0137     struct mfd_cell *mfd;
0138     int cells;
0139
0140     if (!i2c->irq) {
0141         dev_err(&i2c->dev, "No IRQ configured\n");
0142         return -EINVAL;
0143     }
0144     chip_type = (unsigned int)(uintptr_t)
0145             of_device_get_match_data(&i2c->dev);
0146     switch (chip_type) {
0147     case ROHM_CHIP_TYPE_BD71837:
0148         mfd = bd71837_mfd_cells;
0149         cells = ARRAY_SIZE(bd71837_mfd_cells);
0150         break;
0151     case ROHM_CHIP_TYPE_BD71847:
0152         mfd = bd71847_mfd_cells;
0153         cells = ARRAY_SIZE(bd71847_mfd_cells);
0154         break;
0155     default:
0156         dev_err(&i2c->dev, "Unknown device type");
0157         return -EINVAL;
0158     }
0159
0160     regmap = devm_regmap_init_i2c(i2c, &bd718xx_regmap_config);
0161     if (IS_ERR(regmap)) {
0162         dev_err(&i2c->dev, "regmap initialization failed\n");
0163         return PTR_ERR(regmap);
0164     }
0165
0166     ret = devm_regmap_add_irq_chip(&i2c->dev, regmap, i2c->irq,
0167                        IRQF_ONESHOT, 0, &bd718xx_irq_chip,
0168                        &irq_data);
0169     if (ret) {
0170         dev_err(&i2c->dev, "Failed to add irq_chip\n");
0171         return ret;
0172     }
0173
0174     ret = bd718xx_init_press_duration(regmap, &i2c->dev);
0175     if (ret)
0176         return ret;
0177
0178     ret = regmap_irq_get_virq(irq_data, BD718XX_INT_PWRBTN_S);
0179
0180     if (ret < 0) {
0181         dev_err(&i2c->dev, "Failed to get the IRQ\n");
0182         return ret;
0183     }
0184
0185     button.irq = ret;
0186
0187     ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
0188                    mfd, cells, NULL, 0,
0189                    regmap_irq_get_domain(irq_data));
0190     if (ret)
0191         dev_err(&i2c->dev, "Failed to create subdevices\n");
0192
0193     return ret;
0194 }
0195
0196 static const struct of_device_id bd718xx_of_match[] = {
0197     {
0198         .compatible = "rohm,bd71837",
0199         .data = (void *)ROHM_CHIP_TYPE_BD71837,
0200     },
0201     {
0202         .compatible = "rohm,bd71847",
0203         .data = (void *)ROHM_CHIP_TYPE_BD71847,
0204     },
0205     {
0206         .compatible = "rohm,bd71850",
0207         .data = (void *)ROHM_CHIP_TYPE_BD71847,
0208     },
0209     { }
0210 };
0211 MODULE_DEVICE_TABLE(of, bd718xx_of_match);
0212
0213 static struct i2c_driver bd718xx_i2c_driver = {
0214     .driver = {
0215         .name = "rohm-bd718x7",
0216         .of_match_table = bd718xx_of_match,
0217     },
0218     .probe = bd718xx_i2c_probe,
0219 };
0220
0221 static int __init bd718xx_i2c_init(void)
0222 {
0223     return i2c_add_driver(&bd718xx_i2c_driver);
0224 }
0225
0226 /* Initialise early so consumer devices can complete system boot */
0227 subsys_initcall(bd718xx_i2c_init);
0228
0229 static void __exit bd718xx_i2c_exit(void)
0230 {
0231     i2c_del_driver(&bd718xx_i2c_driver);
0232 }
0233 module_exit(bd718xx_i2c_exit);
0234
0235 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
0236 MODULE_DESCRIPTION("ROHM BD71837/BD71847 Power Management IC driver");
0237 MODULE_LICENSE("GPL");