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Linux/drivers/mfd/tps65090.c

  1 /*
  2  * Core driver for TI TPS65090 PMIC family
  3  *
  4  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
  5 
  6  * This program is free software; you can redistribute it and/or modify it
  7  * under the terms and conditions of the GNU General Public License,
  8  * version 2, as published by the Free Software Foundation.
  9 
 10  * This program is distributed in the hope it will be useful, but WITHOUT
 11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 13  * more details.
 14 
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 17  */
 18 
 19 #include <linux/interrupt.h>
 20 #include <linux/irq.h>
 21 #include <linux/kernel.h>
 22 #include <linux/module.h>
 23 #include <linux/mutex.h>
 24 #include <linux/slab.h>
 25 #include <linux/i2c.h>
 26 #include <linux/mfd/core.h>
 27 #include <linux/mfd/tps65090.h>
 28 #include <linux/of.h>
 29 #include <linux/of_device.h>
 30 #include <linux/err.h>
 31 
 32 #define NUM_INT_REG 2
 33 #define TOTAL_NUM_REG 0x18
 34 
 35 #define TPS65090_INT1_MASK_VAC_STATUS_CHANGE            1
 36 #define TPS65090_INT1_MASK_VSYS_STATUS_CHANGE           2
 37 #define TPS65090_INT1_MASK_BAT_STATUS_CHANGE            3
 38 #define TPS65090_INT1_MASK_CHARGING_STATUS_CHANGE       4
 39 #define TPS65090_INT1_MASK_CHARGING_COMPLETE            5
 40 #define TPS65090_INT1_MASK_OVERLOAD_DCDC1               6
 41 #define TPS65090_INT1_MASK_OVERLOAD_DCDC2               7
 42 #define TPS65090_INT2_MASK_OVERLOAD_DCDC3               0
 43 #define TPS65090_INT2_MASK_OVERLOAD_FET1                1
 44 #define TPS65090_INT2_MASK_OVERLOAD_FET2                2
 45 #define TPS65090_INT2_MASK_OVERLOAD_FET3                3
 46 #define TPS65090_INT2_MASK_OVERLOAD_FET4                4
 47 #define TPS65090_INT2_MASK_OVERLOAD_FET5                5
 48 #define TPS65090_INT2_MASK_OVERLOAD_FET6                6
 49 #define TPS65090_INT2_MASK_OVERLOAD_FET7                7
 50 
 51 static struct resource charger_resources[] = {
 52         {
 53                 .start  = TPS65090_IRQ_VAC_STATUS_CHANGE,
 54                 .end    = TPS65090_IRQ_VAC_STATUS_CHANGE,
 55                 .flags  = IORESOURCE_IRQ,
 56         }
 57 };
 58 
 59 enum tps65090_cells {
 60         PMIC = 0,
 61         CHARGER = 1,
 62 };
 63 
 64 static struct mfd_cell tps65090s[] = {
 65         [PMIC] = {
 66                 .name = "tps65090-pmic",
 67         },
 68         [CHARGER] = {
 69                 .name = "tps65090-charger",
 70                 .num_resources = ARRAY_SIZE(charger_resources),
 71                 .resources = &charger_resources[0],
 72                 .of_compatible = "ti,tps65090-charger",
 73         },
 74 };
 75 
 76 static const struct regmap_irq tps65090_irqs[] = {
 77         /* INT1 IRQs*/
 78         [TPS65090_IRQ_VAC_STATUS_CHANGE] = {
 79                         .mask = TPS65090_INT1_MASK_VAC_STATUS_CHANGE,
 80         },
 81         [TPS65090_IRQ_VSYS_STATUS_CHANGE] = {
 82                         .mask = TPS65090_INT1_MASK_VSYS_STATUS_CHANGE,
 83         },
 84         [TPS65090_IRQ_BAT_STATUS_CHANGE] = {
 85                         .mask = TPS65090_INT1_MASK_BAT_STATUS_CHANGE,
 86         },
 87         [TPS65090_IRQ_CHARGING_STATUS_CHANGE] = {
 88                         .mask = TPS65090_INT1_MASK_CHARGING_STATUS_CHANGE,
 89         },
 90         [TPS65090_IRQ_CHARGING_COMPLETE] = {
 91                         .mask = TPS65090_INT1_MASK_CHARGING_COMPLETE,
 92         },
 93         [TPS65090_IRQ_OVERLOAD_DCDC1] = {
 94                         .mask = TPS65090_INT1_MASK_OVERLOAD_DCDC1,
 95         },
 96         [TPS65090_IRQ_OVERLOAD_DCDC2] = {
 97                         .mask = TPS65090_INT1_MASK_OVERLOAD_DCDC2,
 98         },
 99         /* INT2 IRQs*/
100         [TPS65090_IRQ_OVERLOAD_DCDC3] = {
101                         .reg_offset = 1,
102                         .mask = TPS65090_INT2_MASK_OVERLOAD_DCDC3,
103         },
104         [TPS65090_IRQ_OVERLOAD_FET1] = {
105                         .reg_offset = 1,
106                         .mask = TPS65090_INT2_MASK_OVERLOAD_FET1,
107         },
108         [TPS65090_IRQ_OVERLOAD_FET2] = {
109                         .reg_offset = 1,
110                         .mask = TPS65090_INT2_MASK_OVERLOAD_FET2,
111         },
112         [TPS65090_IRQ_OVERLOAD_FET3] = {
113                         .reg_offset = 1,
114                         .mask = TPS65090_INT2_MASK_OVERLOAD_FET3,
115         },
116         [TPS65090_IRQ_OVERLOAD_FET4] = {
117                         .reg_offset = 1,
118                         .mask = TPS65090_INT2_MASK_OVERLOAD_FET4,
119         },
120         [TPS65090_IRQ_OVERLOAD_FET5] = {
121                         .reg_offset = 1,
122                         .mask = TPS65090_INT2_MASK_OVERLOAD_FET5,
123         },
124         [TPS65090_IRQ_OVERLOAD_FET6] = {
125                         .reg_offset = 1,
126                         .mask = TPS65090_INT2_MASK_OVERLOAD_FET6,
127         },
128         [TPS65090_IRQ_OVERLOAD_FET7] = {
129                         .reg_offset = 1,
130                         .mask = TPS65090_INT2_MASK_OVERLOAD_FET7,
131         },
132 };
133 
134 static struct regmap_irq_chip tps65090_irq_chip = {
135         .name = "tps65090",
136         .irqs = tps65090_irqs,
137         .num_irqs = ARRAY_SIZE(tps65090_irqs),
138         .num_regs = NUM_INT_REG,
139         .status_base = TPS65090_REG_INTR_STS,
140         .mask_base = TPS65090_REG_INTR_MASK,
141         .mask_invert = true,
142 };
143 
144 static bool is_volatile_reg(struct device *dev, unsigned int reg)
145 {
146         /* Nearly all registers have status bits mixed in, except a few */
147         switch (reg) {
148         case TPS65090_REG_INTR_MASK:
149         case TPS65090_REG_INTR_MASK2:
150         case TPS65090_REG_CG_CTRL0:
151         case TPS65090_REG_CG_CTRL1:
152         case TPS65090_REG_CG_CTRL2:
153         case TPS65090_REG_CG_CTRL3:
154         case TPS65090_REG_CG_CTRL4:
155         case TPS65090_REG_CG_CTRL5:
156                 return false;
157         }
158         return true;
159 }
160 
161 static const struct regmap_config tps65090_regmap_config = {
162         .reg_bits = 8,
163         .val_bits = 8,
164         .max_register = TOTAL_NUM_REG,
165         .num_reg_defaults_raw = TOTAL_NUM_REG,
166         .cache_type = REGCACHE_RBTREE,
167         .volatile_reg = is_volatile_reg,
168 };
169 
170 #ifdef CONFIG_OF
171 static const struct of_device_id tps65090_of_match[] = {
172         { .compatible = "ti,tps65090",},
173         {},
174 };
175 MODULE_DEVICE_TABLE(of, tps65090_of_match);
176 #endif
177 
178 static int tps65090_i2c_probe(struct i2c_client *client,
179                                         const struct i2c_device_id *id)
180 {
181         struct tps65090_platform_data *pdata = dev_get_platdata(&client->dev);
182         int irq_base = 0;
183         struct tps65090 *tps65090;
184         int ret;
185 
186         if (!pdata && !client->dev.of_node) {
187                 dev_err(&client->dev,
188                         "tps65090 requires platform data or of_node\n");
189                 return -EINVAL;
190         }
191 
192         if (pdata)
193                 irq_base = pdata->irq_base;
194 
195         tps65090 = devm_kzalloc(&client->dev, sizeof(*tps65090), GFP_KERNEL);
196         if (!tps65090) {
197                 dev_err(&client->dev, "mem alloc for tps65090 failed\n");
198                 return -ENOMEM;
199         }
200 
201         tps65090->dev = &client->dev;
202         i2c_set_clientdata(client, tps65090);
203 
204         tps65090->rmap = devm_regmap_init_i2c(client, &tps65090_regmap_config);
205         if (IS_ERR(tps65090->rmap)) {
206                 ret = PTR_ERR(tps65090->rmap);
207                 dev_err(&client->dev, "regmap_init failed with err: %d\n", ret);
208                 return ret;
209         }
210 
211         if (client->irq) {
212                 ret = regmap_add_irq_chip(tps65090->rmap, client->irq,
213                         IRQF_ONESHOT | IRQF_TRIGGER_LOW, irq_base,
214                         &tps65090_irq_chip, &tps65090->irq_data);
215                         if (ret) {
216                                 dev_err(&client->dev,
217                                         "IRQ init failed with err: %d\n", ret);
218                         return ret;
219                 }
220         } else {
221                 /* Don't tell children they have an IRQ that'll never fire */
222                 tps65090s[CHARGER].num_resources = 0;
223         }
224 
225         ret = mfd_add_devices(tps65090->dev, -1, tps65090s,
226                 ARRAY_SIZE(tps65090s), NULL,
227                 0, regmap_irq_get_domain(tps65090->irq_data));
228         if (ret) {
229                 dev_err(&client->dev, "add mfd devices failed with err: %d\n",
230                         ret);
231                 goto err_irq_exit;
232         }
233 
234         return 0;
235 
236 err_irq_exit:
237         if (client->irq)
238                 regmap_del_irq_chip(client->irq, tps65090->irq_data);
239         return ret;
240 }
241 
242 static int tps65090_i2c_remove(struct i2c_client *client)
243 {
244         struct tps65090 *tps65090 = i2c_get_clientdata(client);
245 
246         mfd_remove_devices(tps65090->dev);
247         if (client->irq)
248                 regmap_del_irq_chip(client->irq, tps65090->irq_data);
249 
250         return 0;
251 }
252 
253 static const struct i2c_device_id tps65090_id_table[] = {
254         { "tps65090", 0 },
255         { },
256 };
257 MODULE_DEVICE_TABLE(i2c, tps65090_id_table);
258 
259 static struct i2c_driver tps65090_driver = {
260         .driver = {
261                 .name   = "tps65090",
262                 .owner  = THIS_MODULE,
263                 .of_match_table = of_match_ptr(tps65090_of_match),
264         },
265         .probe          = tps65090_i2c_probe,
266         .remove         = tps65090_i2c_remove,
267         .id_table       = tps65090_id_table,
268 };
269 
270 static int __init tps65090_init(void)
271 {
272         return i2c_add_driver(&tps65090_driver);
273 }
274 subsys_initcall(tps65090_init);
275 
276 static void __exit tps65090_exit(void)
277 {
278         i2c_del_driver(&tps65090_driver);
279 }
280 module_exit(tps65090_exit);
281 
282 MODULE_DESCRIPTION("TPS65090 core driver");
283 MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
284 MODULE_LICENSE("GPL v2");
285 

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