drivers/platform/x86/intel/int3472/tps68470.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Author: Dan Scally <djrscally@gmail.com> */
   3
   4 #include <linux/acpi.h>
   5 #include <linux/i2c.h>
   6 #include <linux/kernel.h>
   7 #include <linux/mfd/core.h>
   8 #include <linux/mfd/tps68470.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/platform_data/tps68470.h>
  11 #include <linux/regmap.h>
  12 #include <linux/string.h>
  13
  14 #include "common.h"
  15 #include "tps68470.h"
  16
  17 #define DESIGNED_FOR_CHROMEOS           1
  18 #define DESIGNED_FOR_WINDOWS            2
  19
  20 #define TPS68470_WIN_MFD_CELL_COUNT     3
  21
  22 static const struct mfd_cell tps68470_cros[] = {
  23         { .name = "tps68470-gpio" },
  24         { .name = "tps68470_pmic_opregion" },
  25 };
  26
  27 static const struct regmap_config tps68470_regmap_config = {
  28         .reg_bits = 8,
  29         .val_bits = 8,
  30         .max_register = TPS68470_REG_MAX,
  31 };
  32
  33 static int tps68470_chip_init(struct device *dev, struct regmap *regmap)
  34 {
  35         unsigned int version;
  36         int ret;
  37
  38         /* Force software reset */
  39         ret = regmap_write(regmap, TPS68470_REG_RESET, TPS68470_REG_RESET_MASK);
  40         if (ret)
  41                 return ret;
  42
  43         ret = regmap_read(regmap, TPS68470_REG_REVID, &version);
  44         if (ret) {
  45                 dev_err(dev, "Failed to read revision register: %d\n", ret);
  46                 return ret;
  47         }
  48
  49         dev_info(dev, "TPS68470 REVID: 0x%02x\n", version);
  50
  51         return 0;
  52 }
  53
  54 /** skl_int3472_tps68470_calc_type: Check what platform a device is designed for
  55  * @adev: A pointer to a &struct acpi_device
  56  *
  57  * Check CLDB buffer against the PMIC's adev. If present, then we check
  58  * the value of control_logic_type field and follow one of the
  59  * following scenarios:
  60  *
  61  *      1. No CLDB - likely ACPI tables designed for ChromeOS. We
  62  *      create platform devices for the GPIOs and OpRegion drivers.
  63  *
  64  *      2. CLDB, with control_logic_type = 2 - probably ACPI tables
  65  *      made for Windows 2-in-1 platforms. Register pdevs for GPIO,
  66  *      Clock and Regulator drivers to bind to.
  67  *
  68  *      3. Any other value in control_logic_type, we should never have
  69  *      gotten to this point; fail probe and return.
  70  *
  71  * Return:
  72  * * 1          Device intended for ChromeOS
  73  * * 2          Device intended for Windows
  74  * * -EINVAL    Where @adev has an object named CLDB but it does not conform to
  75  *              our expectations
  76  */
  77 static int skl_int3472_tps68470_calc_type(struct acpi_device *adev)
  78 {
  79         struct int3472_cldb cldb = { 0 };
  80         int ret;
  81
  82         /*
  83          * A CLDB buffer that exists, but which does not match our expectations
  84          * should trigger an error so we don't blindly continue.
  85          */
  86         ret = skl_int3472_fill_cldb(adev, &cldb);
  87         if (ret && ret != -ENODEV)
  88                 return ret;
  89
  90         if (ret)
  91                 return DESIGNED_FOR_CHROMEOS;
  92
  93         if (cldb.control_logic_type != 2)
  94                 return -EINVAL;
  95
  96         return DESIGNED_FOR_WINDOWS;
  97 }
  98
  99 /*
 100  * Return the size of the flexible array member, because we'll need that later
 101  * on to pass .pdata_size to cells.
 102  */
 103 static int
 104 skl_int3472_fill_clk_pdata(struct device *dev, struct tps68470_clk_platform_data **clk_pdata)
 105 {
 106         struct acpi_device *adev = ACPI_COMPANION(dev);
 107         struct acpi_device *consumer;
 108         unsigned int n_consumers = 0;
 109         const char *sensor_name;
 110         unsigned int i = 0;
 111
 112         for_each_acpi_consumer_dev(adev, consumer)
 113                 n_consumers++;
 114
 115         if (!n_consumers) {
 116                 dev_err(dev, "INT3472 seems to have no dependents\n");
 117                 return -ENODEV;
 118         }
 119
 120         *clk_pdata = devm_kzalloc(dev, struct_size(*clk_pdata, consumers, n_consumers),
 121                                   GFP_KERNEL);
 122         if (!*clk_pdata)
 123                 return -ENOMEM;
 124
 125         (*clk_pdata)->n_consumers = n_consumers;
 126         i = 0;
 127
 128         for_each_acpi_consumer_dev(adev, consumer) {
 129                 sensor_name = devm_kasprintf(dev, GFP_KERNEL, I2C_DEV_NAME_FORMAT,
 130                                              acpi_dev_name(consumer));
 131                 if (!sensor_name)
 132                         return -ENOMEM;
 133
 134                 (*clk_pdata)->consumers[i].consumer_dev_name = sensor_name;
 135                 i++;
 136         }
 137
 138         acpi_dev_put(consumer);
 139
 140         return n_consumers;
 141 }
 142
 143 static int skl_int3472_tps68470_probe(struct i2c_client *client)
 144 {
 145         struct acpi_device *adev = ACPI_COMPANION(&client->dev);
 146         const struct int3472_tps68470_board_data *board_data;
 147         struct tps68470_clk_platform_data *clk_pdata;
 148         struct mfd_cell *cells;
 149         struct regmap *regmap;
 150         int n_consumers;
 151         int device_type;
 152         int ret;
 153         int i;
 154
 155         n_consumers = skl_int3472_fill_clk_pdata(&client->dev, &clk_pdata);
 156         if (n_consumers < 0)
 157                 return n_consumers;
 158
 159         regmap = devm_regmap_init_i2c(client, &tps68470_regmap_config);
 160         if (IS_ERR(regmap)) {
 161                 dev_err(&client->dev, "Failed to create regmap: %ld\n", PTR_ERR(regmap));
 162                 return PTR_ERR(regmap);
 163         }
 164
 165         i2c_set_clientdata(client, regmap);
 166
 167         ret = tps68470_chip_init(&client->dev, regmap);
 168         if (ret < 0) {
 169                 dev_err(&client->dev, "TPS68470 init error %d\n", ret);
 170                 return ret;
 171         }
 172
 173         device_type = skl_int3472_tps68470_calc_type(adev);
 174         switch (device_type) {
 175         case DESIGNED_FOR_WINDOWS:
 176                 board_data = int3472_tps68470_get_board_data(dev_name(&client->dev));
 177                 if (!board_data)
 178                         return dev_err_probe(&client->dev, -ENODEV, "No board-data found for this model\n");
 179
 180                 cells = kcalloc(TPS68470_WIN_MFD_CELL_COUNT, sizeof(*cells), GFP_KERNEL);
 181                 if (!cells)
 182                         return -ENOMEM;
 183
 184                 /*
 185                  * The order of the cells matters here! The clk must be first
 186                  * because the regulator depends on it. The gpios must be last,
 187                  * acpi_gpiochip_add() calls acpi_dev_clear_dependencies() and
 188                  * the clk + regulators must be ready when this happens.
 189                  */
 190                 cells[0].name = "tps68470-clk";
 191                 cells[0].platform_data = clk_pdata;
 192                 cells[0].pdata_size = struct_size(clk_pdata, consumers, n_consumers);
 193                 cells[1].name = "tps68470-regulator";
 194                 cells[1].platform_data = (void *)board_data->tps68470_regulator_pdata;
 195                 cells[1].pdata_size = sizeof(struct tps68470_regulator_platform_data);
 196                 cells[2].name = "tps68470-gpio";
 197
 198                 for (i = 0; i < board_data->n_gpiod_lookups; i++)
 199                         gpiod_add_lookup_table(board_data->tps68470_gpio_lookup_tables[i]);
 200
 201                 ret = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_NONE,
 202                                            cells, TPS68470_WIN_MFD_CELL_COUNT,
 203                                            NULL, 0, NULL);
 204                 kfree(cells);
 205
 206                 if (ret) {
 207                         for (i = 0; i < board_data->n_gpiod_lookups; i++)
 208                                 gpiod_remove_lookup_table(board_data->tps68470_gpio_lookup_tables[i]);
 209                 }
 210
 211                 break;
 212         case DESIGNED_FOR_CHROMEOS:
 213                 ret = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_NONE,
 214                                            tps68470_cros, ARRAY_SIZE(tps68470_cros),
 215                                            NULL, 0, NULL);
 216                 break;
 217         default:
 218                 dev_err(&client->dev, "Failed to add MFD devices\n");
 219                 return device_type;
 220         }
 221
 222         /*
 223          * No acpi_dev_clear_dependencies() here, since the acpi_gpiochip_add()
 224          * for the GPIO cell already does this.
 225          */
 226
 227         return ret;
 228 }
 229
 230 static void skl_int3472_tps68470_remove(struct i2c_client *client)
 231 {
 232         const struct int3472_tps68470_board_data *board_data;
 233         int i;
 234
 235         board_data = int3472_tps68470_get_board_data(dev_name(&client->dev));
 236         if (board_data) {
 237                 for (i = 0; i < board_data->n_gpiod_lookups; i++)
 238                         gpiod_remove_lookup_table(board_data->tps68470_gpio_lookup_tables[i]);
 239         }
 240 }
 241
 242 static const struct acpi_device_id int3472_device_id[] = {
 243         { "INT3472", 0 },
 244         { }
 245 };
 246 MODULE_DEVICE_TABLE(acpi, int3472_device_id);
 247
 248 static struct i2c_driver int3472_tps68470 = {
 249         .driver = {
 250                 .name = "int3472-tps68470",
 251                 .acpi_match_table = int3472_device_id,
 252         },
 253         .probe_new = skl_int3472_tps68470_probe,
 254         .remove = skl_int3472_tps68470_remove,
 255 };
 256 module_i2c_driver(int3472_tps68470);
 257
 258 MODULE_DESCRIPTION("Intel SkyLake INT3472 ACPI TPS68470 Device Driver");
 259 MODULE_AUTHOR("Daniel Scally <djrscally@gmail.com>");
 260 MODULE_LICENSE("GPL v2");
 261 MODULE_SOFTDEP("pre: clk-tps68470 tps68470-regulator");