1 /* 2 * Core driver for TPS61050/61052 boost converters, used for while LED 3 * driving, audio power amplification, white LED flash, and generic 4 * boost conversion. Additionally it provides a 1-bit GPIO pin (out or in) 5 * and a flash synchronization pin to synchronize flash events when used as 6 * flashgun. 7 * 8 * Copyright (C) 2011 ST-Ericsson SA 9 * Written on behalf of Linaro for ST-Ericsson 10 * 11 * Author: Linus Walleij <linus.walleij@linaro.org> 12 * 13 * License terms: GNU General Public License (GPL) version 2 14 */ 15 16 #include <linux/module.h> 17 #include <linux/init.h> 18 #include <linux/i2c.h> 19 #include <linux/regmap.h> 20 #include <linux/gpio.h> 21 #include <linux/spinlock.h> 22 #include <linux/slab.h> 23 #include <linux/err.h> 24 #include <linux/mfd/core.h> 25 #include <linux/mfd/tps6105x.h> 26 27 static struct regmap_config tps6105x_regmap_config = { 28 .reg_bits = 8, 29 .val_bits = 8, 30 .max_register = TPS6105X_REG_3, 31 }; 32 33 static int tps6105x_startup(struct tps6105x *tps6105x) 34 { 35 int ret; 36 unsigned int regval; 37 38 ret = regmap_read(tps6105x->regmap, TPS6105X_REG_0, ®val); 39 if (ret) 40 return ret; 41 switch (regval >> TPS6105X_REG0_MODE_SHIFT) { 42 case TPS6105X_REG0_MODE_SHUTDOWN: 43 dev_info(&tps6105x->client->dev, 44 "TPS6105x found in SHUTDOWN mode\n"); 45 break; 46 case TPS6105X_REG0_MODE_TORCH: 47 dev_info(&tps6105x->client->dev, 48 "TPS6105x found in TORCH mode\n"); 49 break; 50 case TPS6105X_REG0_MODE_TORCH_FLASH: 51 dev_info(&tps6105x->client->dev, 52 "TPS6105x found in FLASH mode\n"); 53 break; 54 case TPS6105X_REG0_MODE_VOLTAGE: 55 dev_info(&tps6105x->client->dev, 56 "TPS6105x found in VOLTAGE mode\n"); 57 break; 58 default: 59 break; 60 } 61 62 return ret; 63 } 64 65 /* 66 * MFD cells - we always have a GPIO cell and we have one cell 67 * which is selected operation mode. 68 */ 69 static struct mfd_cell tps6105x_gpio_cell = { 70 .name = "tps6105x-gpio", 71 }; 72 73 static struct mfd_cell tps6105x_leds_cell = { 74 .name = "tps6105x-leds", 75 }; 76 77 static struct mfd_cell tps6105x_flash_cell = { 78 .name = "tps6105x-flash", 79 }; 80 81 static struct mfd_cell tps6105x_regulator_cell = { 82 .name = "tps6105x-regulator", 83 }; 84 85 static int tps6105x_add_device(struct tps6105x *tps6105x, 86 struct mfd_cell *cell) 87 { 88 cell->platform_data = tps6105x; 89 cell->pdata_size = sizeof(*tps6105x); 90 91 return mfd_add_devices(&tps6105x->client->dev, 92 PLATFORM_DEVID_AUTO, cell, 1, NULL, 0, NULL); 93 } 94 95 static int tps6105x_probe(struct i2c_client *client, 96 const struct i2c_device_id *id) 97 { 98 struct tps6105x *tps6105x; 99 struct tps6105x_platform_data *pdata; 100 int ret; 101 102 pdata = dev_get_platdata(&client->dev); 103 if (!pdata) { 104 dev_err(&client->dev, "missing platform data\n"); 105 return -ENODEV; 106 } 107 108 tps6105x = devm_kmalloc(&client->dev, sizeof(*tps6105x), GFP_KERNEL); 109 if (!tps6105x) 110 return -ENOMEM; 111 112 tps6105x->regmap = devm_regmap_init_i2c(client, &tps6105x_regmap_config); 113 if (IS_ERR(tps6105x->regmap)) 114 return PTR_ERR(tps6105x->regmap); 115 116 i2c_set_clientdata(client, tps6105x); 117 tps6105x->client = client; 118 tps6105x->pdata = pdata; 119 120 ret = tps6105x_startup(tps6105x); 121 if (ret) { 122 dev_err(&client->dev, "chip initialization failed\n"); 123 return ret; 124 } 125 126 ret = tps6105x_add_device(tps6105x, &tps6105x_gpio_cell); 127 if (ret) 128 return ret; 129 130 switch (pdata->mode) { 131 case TPS6105X_MODE_SHUTDOWN: 132 dev_info(&client->dev, 133 "present, not used for anything, only GPIO\n"); 134 break; 135 case TPS6105X_MODE_TORCH: 136 ret = tps6105x_add_device(tps6105x, &tps6105x_leds_cell); 137 break; 138 case TPS6105X_MODE_TORCH_FLASH: 139 ret = tps6105x_add_device(tps6105x, &tps6105x_flash_cell); 140 break; 141 case TPS6105X_MODE_VOLTAGE: 142 ret = tps6105x_add_device(tps6105x, &tps6105x_regulator_cell); 143 break; 144 default: 145 dev_warn(&client->dev, "invalid mode: %d\n", pdata->mode); 146 break; 147 } 148 149 if (ret) 150 mfd_remove_devices(&client->dev); 151 152 return ret; 153 } 154 155 static int tps6105x_remove(struct i2c_client *client) 156 { 157 struct tps6105x *tps6105x = i2c_get_clientdata(client); 158 159 mfd_remove_devices(&client->dev); 160 161 /* Put chip in shutdown mode */ 162 regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0, 163 TPS6105X_REG0_MODE_MASK, 164 TPS6105X_MODE_SHUTDOWN << TPS6105X_REG0_MODE_SHIFT); 165 166 return 0; 167 } 168 169 static const struct i2c_device_id tps6105x_id[] = { 170 { "tps61050", 0 }, 171 { "tps61052", 0 }, 172 { } 173 }; 174 MODULE_DEVICE_TABLE(i2c, tps6105x_id); 175 176 static struct i2c_driver tps6105x_driver = { 177 .driver = { 178 .name = "tps6105x", 179 }, 180 .probe = tps6105x_probe, 181 .remove = tps6105x_remove, 182 .id_table = tps6105x_id, 183 }; 184 185 static int __init tps6105x_init(void) 186 { 187 return i2c_add_driver(&tps6105x_driver); 188 } 189 subsys_initcall(tps6105x_init); 190 191 static void __exit tps6105x_exit(void) 192 { 193 i2c_del_driver(&tps6105x_driver); 194 } 195 module_exit(tps6105x_exit); 196 197 MODULE_AUTHOR("Linus Walleij"); 198 MODULE_DESCRIPTION("TPS6105x White LED Boost Converter Driver"); 199 MODULE_LICENSE("GPL v2"); 200