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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 | /* * Core driver for TPS61050/61052 boost converters, used for while LED * driving, audio power amplification, white LED flash, and generic * boost conversion. Additionally it provides a 1-bit GPIO pin (out or in) * and a flash synchronization pin to synchronize flash events when used as * flashgun. * * Copyright (C) 2011 ST-Ericsson SA * Written on behalf of Linaro for ST-Ericsson * * Author: Linus Walleij <linus.walleij@linaro.org> * * License terms: GNU General Public License (GPL) version 2 */ #include <linux/module.h> #include <linux/init.h> #include <linux/i2c.h> #include <linux/regmap.h> #include <linux/gpio.h> #include <linux/spinlock.h> #include <linux/slab.h> #include <linux/err.h> #include <linux/mfd/core.h> #include <linux/mfd/tps6105x.h> static struct regmap_config tps6105x_regmap_config = { .reg_bits = 8, .val_bits = 8, .max_register = TPS6105X_REG_3, }; static int tps6105x_startup(struct tps6105x *tps6105x) { int ret; unsigned int regval; ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, ®val); if (ret) return ret; switch (regval >> TPS6105X_REG0_MODE_SHIFT) { case TPS6105X_REG0_MODE_SHUTDOWN: dev_info(&tps6105x->client->dev, "TPS6105x found in SHUTDOWN mode\n"); break; case TPS6105X_REG0_MODE_TORCH: dev_info(&tps6105x->client->dev, "TPS6105x found in TORCH mode\n"); break; case TPS6105X_REG0_MODE_TORCH_FLASH: dev_info(&tps6105x->client->dev, "TPS6105x found in FLASH mode\n"); break; case TPS6105X_REG0_MODE_VOLTAGE: dev_info(&tps6105x->client->dev, "TPS6105x found in VOLTAGE mode\n"); break; default: break; } return ret; } /* * MFD cells - we always have a GPIO cell and we have one cell * which is selected operation mode. */ static struct mfd_cell tps6105x_gpio_cell = { .name = "tps6105x-gpio", }; static struct mfd_cell tps6105x_leds_cell = { .name = "tps6105x-leds", }; static struct mfd_cell tps6105x_flash_cell = { .name = "tps6105x-flash", }; static struct mfd_cell tps6105x_regulator_cell = { .name = "tps6105x-regulator", }; static int tps6105x_add_device(struct tps6105x *tps6105x, struct mfd_cell *cell) { cell->platform_data = tps6105x; cell->pdata_size = sizeof(*tps6105x); return mfd_add_devices(&tps6105x->client->dev, PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL); } static int tps6105x_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct tps6105x *tps6105x; struct tps6105x_platform_data *pdata; int ret; pdata = dev_get_platdata(&client->dev); if (!pdata) { dev_err(&client->dev, "missing platform data\n"); return -ENODEV; } tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL); if (!tps6105x) return -ENOMEM; tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config); if (IS_ERR(tps6105x->regmap)) return PTR_ERR(tps6105x->regmap); i2c_set_clientdata(client, tps6105x); tps6105x->client = client; tps6105x->pdata = pdata; ret = tps6105x_startup(tps6105x); if (ret) { dev_err(&client->dev, "chip initialization failed\n"); return ret; } ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell); if (ret) return ret; switch (pdata->mode) { case TPS6105X_MODE_SHUTDOWN: dev_info(&client->dev, "present, not used for anything, only GPIO\n"); break; case TPS6105X_MODE_TORCH: ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell); break; case TPS6105X_MODE_TORCH_FLASH: ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell); break; case TPS6105X_MODE_VOLTAGE: ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell); break; default: dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode); break; } if (ret) mfd_remove_devices(&client->dev); return ret; } static int tps6105x_remove(struct i2c_client *client) { struct tps6105x *tps6105x = i2c_get_clientdata(client); mfd_remove_devices(&client->dev); /* Put chip in shutdown mode */ regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0, TPS6105X_REG0_MODE_MASK, TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT); return 0; } static const struct i2c_device_id tps6105x_id[] = { { "tps61050", 0 }, { "tps61052", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, tps6105x_id); static struct i2c_driver tps6105x_driver = { .driver = { .name = "tps6105x", }, .probe = tps6105x_probe, .remove = tps6105x_remove, .id_table = tps6105x_id, }; static int __init tps6105x_init(void) { return i2c_add_driver(&tps6105x_driver); } subsys_initcall(tps6105x_init); static void __exit tps6105x_exit(void) { i2c_del_driver(&tps6105x_driver); } module_exit(tps6105x_exit); MODULE_AUTHOR("Linus Walleij"); MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver"); MODULE_LICENSE("GPL v2"); |